Page 1 Service Guide N5241A (10 MHz–13.5 GHz) N5242A (10 MHz–26.5 GHz) Agilent Technologies 2-Port and 4-Port PNA-X Microwave Network Analyzers Part Number N5242-90001 Printed in USA September 10, 2009 Supersedes Print Date: September 2, 2009 © Agilent Technologies, Inc. 2007-2009...
Page 2 DFAR 252.227-7015 (b)(2) (November 1995), as applicable in any technical data. Certification Agilent Technologies, Inc. certifies that this product met its published specifications at the time of shipment from the factory. Agilent Technologies, Inc. further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute's calibration facility, and to the calibration facilities of other International Standards Organization members.
Page 3 Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies, Inc. products. For information about these agreements and for other assistance, contact Agilent. Refer to “Contacting Agilent” on page 2-15. Safety and Regulatory Information The safety and regulatory information pertaining to this product is located in Chapter 1, “Safety and Regulatory Information.”...
Page 4 Documentation Map The online Help files are embedded in the analyzer, offering quick reference to programming and user documentation. From the Help drop-down menu, you can access the Help system in five different languages. Also, you can view the Analyzer Product Overview multimedia presentation and access the analyzer’s Web page.
Page 5: Table Of Contents
Contents 1 Safety and Regulatory Information Information in This Chapter ...........1-2 Chapter One at-a-Glance .
Page 6 Contents Required Service Test Equipment ..........2-12 Agilent Support, Services, and Assistance.
Page 7 Contents Noise Figure Adjustment (Available Only with Option 029 Installed) ....3-44 4 Troubleshooting Information in This Chapter ...........4-2 Chapter Four at-a-Glance.
Page 8 Contents Signal Separation Group Operation ..........5-16 Configurable Test Set .
Page 9 Contents Bottom Assemblies, 4-Port, Option 419 (including Option 029).....6-46 Bottom RF Cables, 4-Port, Option 419 without Option 029 (Ports 1 and 2) ...6-48 Bottom RF Cables, 4-Port, Option 419 with Option 029 (Ports 1 and 2) .
Page 10 Contents Removing and Replacing the A54 Option 029 Test Port 2 Bridge and the A55 Option 029 Noise Downconverter............. 7-56 Removing and Replacing the Rear Panel .
Page 11: Safety And Regulatory Information
Safety and Regulatory Information Service Guide N5242-90001...
Page 12: Information In This Chapter
Safety and Regulatory Information PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer. It also contains information that is required by various government regulatory agencies.
Page 13: Safety Symbols
PNA Series Microwave Network Analyzers Safety and Regulatory Information N5241A/42A Safety Symbols Safety Symbols The following safety symbols are used throughout this manual. Familiarize yourself with each of the symbols and its meaning before operating this instrument. CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not correctly performed or adhered to, could result in damage to or destruction of the instrument.
Page 14: Servicing
Safety and Regulatory Information PNA Series Microwave Network Analyzers General Safety Considerations N5241A/42A CAUTION This instrument has autoranging line voltage input. Be sure the supply voltage is within the specified range. WARNING Supply voltages which oscillate between the two normal input ranges of the autoranging line voltage input will damage the power supply.
Page 15 PNA Series Microwave Network Analyzers Safety and Regulatory Information N5241A/42A General Safety Considerations CAUTION Do not operate the analyzer with the outer cover removed for more than 30 minutes, as this could cause the analyzer to overheat which could result in costly damage.
Page 16: Electrostatic Discharge Protection
Safety and Regulatory Information PNA Series Microwave Network Analyzers Electrostatic Discharge Protection N5241A/42A Electrostatic Discharge Protection Protection against electrostatic discharge (ESD) is essential while removing assemblies from or connecting cables to the network analyzer. Static electricity can build up on your body and can easily damage sensitive internal circuit elements when discharged.
Page 17: Regulatory Information
PNA Series Microwave Network Analyzers Safety and Regulatory Information N5241A/42A Regulatory Information Regulatory Information This section contains information that is required by various government regulatory agencies. Instrument Markings Familiarize yourself with these instrument markings and their meanings before operating the instrument. The instruction documentation symbol.
Page 18: Lithium Battery Disposal
If the battery on the A17 CPU board assembly needs to be disposed of, dispose of it in accordance with your country’s requirements. If required, you may return the battery to Agilent Technologies for disposal. Refer to “Contacting Agilent” on page 2-15 assistance.
Page 19: General Product Information
General Product Information Service Guide N5242-90001...
Page 20: Information In This Chapter
General Product Information PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter Chapter Two at-a-Glance Section Title Summary of Content Start Page Cleaning instructions for the external surfaces of your analyzer. Maintenance Page 2-3 Information about electrical maintenance of your analyzer.
Page 21: Maintenance
PNA Series Microwave Network Analyzers General Product Information N5241A/42A Maintenance Maintenance Physical Maintenance WARNING To prevent electrical shock, disconnect the analyzer from the mains source before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally. Electrical Maintenance Refer to “Contacting Agilent”...
Page 22: Option 010, Time Domain Operation
General Product Information PNA Series Microwave Network Analyzers Analyzer Options Available N5241A/42A Option 010, Time Domain Operation This option can be added to any other option combination. An Option 010 analyzer can display the time domain response of a network or test device by calculating the inverse Fourier transform of the frequency domain response.
Page 23: Option 080, Frequency Offset Measurements
Option 200, Standard 2-Port Configuration This is a 2-port network analyzer with an upper frequency limit of either 13.5 GHz (N5241A) or 26.5 GHz (N5242A). This is the standard 2-port analyzer and contains: • one internal source Service Guide N5242-90001...
Page 24: Option 219, 2-Port With Extended Power Range And Bias Tees
Option 400, Standard 4-Port Configuration This is a 4-port network analyzer with an upper frequency limit of either 13.5 GHz (N5241A) or 26.5 GHz (N5242A). This is the standard 4-port analyzer and contains: • two internal sources • a reference mixer switch •...
Page 25: Option 897, Built-In Tests For Commercial Calibration
PNA Series Microwave Network Analyzers General Product Information N5241A/42A Analyzer Options Available Option 897, Built-In Tests for Commercial Calibration This option enables performance tests that are built into the analyzer that enable you to perform ISO 9001 commercial calibration of your analyzer. Refer to “Calibration Options”...
Page 26: Calibration Options
General Product Information PNA Series Microwave Network Analyzers Analyzer Options Available N5241A/42A Calibration Options Option UK6, Commercial Calibration Certificate with Test Data A complete set of measurements that test the analyzer to the manufacturer’s published specifications. It includes a calibration label, a calibration certificate, and the corresponding calibration data report.
Page 27: Analyzer Upgrades Available
Analyzer Upgrades Available Analyzer Upgrades Available The options described in this chapter can be ordered as upgrades. The following table lists the Upgrades that are available for the N5241A and N5242A analyzers. Refer to the previous section, “Analyzer Options Available” on page 2-3, for a complete description of each option.
Page 28 General Product Information PNA Series Microwave Network Analyzers Analyzer Upgrades Available N5241A/42A Table 2-1 Analyzer Upgrades Available Upgrade Order Number Add built-in performance test software for standards compliant calibration perpetual N5241A/42AU-898 license (Option898) 2-10 Service Guide N5242-90001...
Page 29: Analyzer Accessories Available
PNA Series Microwave Network Analyzers General Product Information N5241A/42A Analyzer Accessories Available Analyzer Accessories Available CD-RW Drive–N4688A This accessory is an external read/write CD drive with a USB cable and can be ordered as model number N4688A. USB Hub–N4689A This accessory is a 4-port USB hub for connecting additional USB peripheral devices and can be ordered as model number N4689A.
Page 30: Required Service Test Equipment
General Product Information PNA Series Microwave Network Analyzers Required Service Test Equipment N5241A/42A Required Service Test Equipment Recommended Alternate Model or Part Model or Part Equipment Critical Specifications Number Number Test Instruments and Software Freq: 10 MHz to 10.5 GHz 53151A Frequency counter None...
Page 31 PNA Series Microwave Network Analyzers General Product Information N5241A/42A Required Service Test Equipment Required Service Test Equipment (Cont’d) Recommended Alternate Model Critical Specifications Model or Part Equipment or Part Number Number Calibration and Verification Kits 3.5 mm calibration kit Freq: 10 MHz to 26.5 GHz 85052B 85052D P,T,V...
Page 32 General Product Information PNA Series Microwave Network Analyzers Required Service Test Equipment N5241A/42A Required Service Test Equipment (Cont’d) Recommended Alternate Model or Part Model Equipment Critical Specifications Number Number Tools T-8 TORX driver 0.6 N-m (5 in-lb) setting 0.5, 0.8, and 1.0 N-m T-10 TORX driver T, R (4, 7, and 9 in-lb) settings...
Page 33: Agilent Support, Services, And Assistance
Agilent for repair. If you wish to send your network analyzer to Agilent Technologies for service or repair: • Include a complete description of the service requested or of the failure and a description of any failed test and any error message.
Page 34 General Product Information PNA Series Microwave Network Analyzers Agilent Support, Services, and Assistance N5241A/42A 2-16 Service Guide N5242-90001...
Page 35: Tests And Adjustments
Tests and Adjustments Service Guide N5242-90001...
Page 36: Information In This Chapter
Tests and Adjustments PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter This chapter contains procedures to help you check, verify, and adjust your PNA. • The checks verify the operation of the assemblies in your analyzer. •...
Page 37 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Information in This Chapter Section Title Summary of Content Start Page Performing the operator’s check. Checking your test cables. Preliminary Checks Page 3-11 Perform these checks before performing system verification. What the system verification does. System Verification How to perform the verification test.
Page 38: Before You Begin
Tests and Adjustments PNA Series Microwave Network Analyzers Before You Begin N5241A/42A Before You Begin Before checking, verifying, or adjusting the analyzer, refer to the following paragraphs to: • make sure the operating environment is within its requirements • make sure that proper electrostatic discharge (ESD) protection is provided •...
Page 39: Review The Principles Of Connector Care
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Before You Begin Review the Principles of Connector Care Proper connector care and connection techniques are critical for accurate and repeatable measurements. Refer to Table 3-1 for tips on connector care. Prior to making connections to your analyzer, carefully review the information about inspecting, cleaning, and gaging connectors.
Page 40: About System Verification And Performance Tests
Tests and Adjustments PNA Series Microwave Network Analyzers About System Verification and Performance Tests N5241A/42A About System Verification and Performance Tests The performance of the network analyzer is specified in two ways: system specifications, and instrument specifications. It is the end user’s responsibility to determine which set of specifications is applicable to their use of the PNA.
Page 41: System Verification Procedure
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A About System Verification and Performance Tests System Verification Procedure The system verification procedure tests the network analyzer measurement “system”, as defined previously, against the system specifications. If confirmation is successful, the measurement system is capable of making measurements to the accuracy specified by the graphs of measurement uncertainty.
Page 42: Certificate Of Calibration
N5241A/42A Certificate of Calibration Agilent Technologies will issue a certificate of calibration upon successful completion of system verification or completion of the performance tests. The certificate of calibration will apply to the “system” (analyzer, calibration kit, test cables, and any necessary adapters) if the system verification procedure is used to confirm the system specifications.
Page 43: Ansi/Ncsl Z540-1-1994 Verification
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A ANSI/NCSL Z540–1–1994 Verification ANSI/NCSL Z540–1–1994 Verification To meet the criteria for ANSI/NCSL Z540-1-1994, perform the preliminary checks and all performance tests without stopping to repair or adjust . Refer to Figure 3-1 for test flow.
Page 44: Non-Ansi/Ncsl Z540-1-1994 Verification
Tests and Adjustments PNA Series Microwave Network Analyzers Non-ANSI/NCSL Z540–1–1994 Verification N5241A/42A Non-ANSI/NCSL Z540–1–1994 Verification For non-ANSI/NCSL Z540-1-1994, perform the preliminary checks and the performance tests while stopping to troubleshoot. Refer to Figure 3-2 for test flow. Troubleshoot and repair the first problem encountered without continuing to other tests. After you troubleshoot, repair, and adjust, repeat the last failed portion and generate a new set of data.
Page 45: Preliminary Checks
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Preliminary Checks Preliminary Checks Preliminary checks include the following: • “The Operator’s Check” on page 3-11 The operator’s check tests the network analyzer’s basic functionality of the source, switch, and receivers. •...
Page 46 Tests and Adjustments PNA Series Microwave Network Analyzers Preliminary Checks N5241A/42A 5. The result of the operator’s check will be shown as a PASS or FAIL next to each test (refer to Figure 3-3). The PNA Operator’s Check dialog box will look different for different PNA model numbers and installed options.
Page 47: The Test Port Cable Checks
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Preliminary Checks The Test Port Cable Checks A faulty test port cable can cause a failure in the verification test. The following checks are not required, but are recommended to verify the performance of the test port cable. •...
Page 48 Tests and Adjustments PNA Series Microwave Network Analyzers Preliminary Checks N5241A/42A Cable Return Loss Check 1. Press UTILITY Preset 2. Perform a one-port calibration on Port 1, 1-Port Reflection. Refer to the embedded help in the analyzer if necessary. 3. Connect the test port cable to Port 1. Connect a broadband load to the other end of the cable.
Page 49 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Preliminary Checks Cable Insertion Loss Check 1. With the test port cable still connected to Port 1, connect a short to the other end of the cable. 2. Press MARKER/ANALYSIS , then .
Page 50 Tests and Adjustments PNA Series Microwave Network Analyzers Preliminary Checks N5241A/42A Cable Magnitude and Phase Stability Check 1. With the test port cable still connected to Port 1, connect a short to the other end of the cable. 2. Press UTILITY Preset 3.
Page 51 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Preliminary Checks Figure 3-6 Typical Cable Magnitude and Phase Stability Response If the Cable Magnitude and Phase Stability Check Fails 1. Clean the cable and devices and torque to specification. Repeat the check. 2.
Page 52 Tests and Adjustments PNA Series Microwave Network Analyzers Preliminary Checks N5241A/42A Cable Connector Repeatability Check NOTE The connector repeatability measurement should be done at the test port as well as at the end of the test port cable. 1. With the test port cable still connected to Port 1, connect a broadband load to the other end of the cable.
Page 53 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Preliminary Checks 12. For the Port 2, 3, and 4 Check, connect the cable (with the load attached) to the respective port and repeat steps 2 through 11. Figure 3-7 Typical Cable Connector Repeatability Response If the Cable Connector Repeatability Check Fails 1.
Page 54: System Verification
Tests and Adjustments PNA Series Microwave Network Analyzers System Verification N5241A/42A System Verification System verification is used to verify system-level, error-corrected uncertainty limits for network analyzer measurements. The verification procedure is automated and is contained in the firmware of the analyzer. The device data provided with the verification kit has a traceable path to a national standard.
Page 55: Measurement Uncertainty
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A System Verification Measurement Uncertainty Measurement uncertainty is defined as the sum of: • the residual systematic (repeatable) errors, and • the random (non-repeatable) errors in the measurement system after calibration. The systematic errors are: •...
Page 56: Measurement Traceability
Tests and Adjustments PNA Series Microwave Network Analyzers System Verification N5241A/42A Measurement Traceability To establish a measurement traceability path to a national standard for a network analyzer system, the overall system performance is verified through the measurement of devices that have a traceable path. This is accomplished by measuring the devices in an Agilent verification kit.
Page 57: Performing System Verification
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A System Verification Performing System Verification The following verification procedure is automated by the analyzer firmware. The process for the verification is: • connect cables to the analyzer test ports • perform a calibration or recall a recent calibration •...
Page 58 Tests and Adjustments PNA Series Microwave Network Analyzers System Verification N5241A/42A Cable Substitution The test port cables specified for the network analyzer system have been characterized for connector repeatability, magnitude and phase stability with flexing, return loss, insertion loss, and aging rate. Since test port cable performance is a significant contributor to the system performance, cables of lower performance will increase the uncertainty of your measurement.
Page 59 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A System Verification 4. In the Calibration Kit box, select the calibration kit or electronic calibration module (ECal) that is being used by clicking on it. The corresponding verification kit to use is selected for you and displayed in the Verification Kit box.
Page 60 Tests and Adjustments PNA Series Microwave Network Analyzers System Verification N5241A/42A If the System Fails the Verification Test Inspect all connections. Do not remove the cable from the analyzer test port. IMPORTANT This will invalidate the calibration that you performed earlier. 1.
Page 61 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A System Verification Interpreting the Verification Results Figure 3-11 shows an example of typical verification results with Print Tabular Data selected in the Printer Output area of the System Verification dialog box. At the top of the printed output is the name of the device, the serial number of the device, and the date tested.
Page 62 Tests and Adjustments PNA Series Microwave Network Analyzers System Verification N5241A/42A Figure 3-12 shows an example of typical verification results with Print Graphs selected in the Printer Output area of the System Verification dialog box. The printed graphical results show the following: •...
Page 63: Performance Tests
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Performance Tests Performance Tests The performance tests verify the electrical performance of your N5241A/42A microwave PNA. These performance tests are included in the analyzer’s firmware with Option 897 and Option 898. Your analyzer is automatically configured for each individual test. The model numbers of the additional equipment used by these performance tests are specified under “Required Service Test Equipment”...
Page 64: Source Maximum Power Output Test
Tests and Adjustments PNA Series Microwave Network Analyzers Performance Tests N5241A/42A Source Maximum Power Output Test Function of the Test: To confirm the maximum source output power of your network analyzer over its full frequency range. Specification Tested: Test Port Output–Maximum Leveled Power Equipment Used: A power meter, power sensors, and adapters.
Page 65: Frequency Accuracy Test
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Performance Tests Frequency Accuracy Test Function of the Test: To verify the frequency accuracy and range of the analyzer’s source output. Specification Tested: Test Port Output–CW Accuracy Equipment Used: A frequency counter, a test cable, and adapters. Description of the Test: 1.
Page 66: Receiver Compression Test
Tests and Adjustments PNA Series Microwave Network Analyzers Performance Tests N5241A/42A Receiver Compression Test Function of the Test: To measure the compression at the analyzer’s specified maximum power level for the receivers. Specification Tested: Test Port Input–Maximum Test Port Input Level Equipment Used: The compression test set (Z5623A Option K01), a power meter, power sensors, two test cables, and a calibration kit.
Page 67: Noise Floor Test
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Performance Tests Noise Floor Test Function of the Test: To measure the absolute power level of the noise floor for the analyzer’s receivers. Specification Tested: Test Port Input–Test Port Noise Floor Equipment Used: A power meter, power sensor, a calibration kit, and a test cable.
Page 68: Calibration Coefficients Test
Tests and Adjustments PNA Series Microwave Network Analyzers Performance Tests N5241A/42A Calibration Coefficients Test Function of the Test: To verify the uncorrected calibration coefficients of your analyzer. The calibration coefficients are measured in forward and reverse direction. Refer to Appendix 8, “General Purpose Maintenance Procedures” for error term information relating to the calibration coefficients measured.
Page 69: Dynamic Accuracy Test
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Performance Tests Dynamic Accuracy Test Function of the Test: To measure the relative power linearity of the analyzer’s receivers. Specification Tested: Test Port Input–Dynamic Accuracy Equipment Used: The dynamic accuracy test set (Z5623A Option H01), a power meter (E4418B or E4419B), power sensors, and two test cables.
Page 70: Adjustments
Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A Adjustments These adjustments are firmware-driven tests that are used to fine-tune your analyzer. If multiple adjustments are to be performed, perform them in the order listed. • “10 MHz Frequency Reference Adjustment” on page 3-37 •...
Page 71: 10 Mhz Frequency Reference Adjustment
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Adjustments 10 MHz Frequency Reference Adjustment The 10 MHz frequency adjustment is used to adjust the frequency accuracy of the network analyzer’s 10 MHz frequency reference on the A10 frequency reference board assembly. Equipment Used for the 10 MHz Frequency Reference Adjustment Equipment Type Model or Part Number...
Page 72: If Gain Adjustment
Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A IF Gain Adjustment The IF gain adjustment is used to adjust the IF gain of the network analyzer. Procedure 1. Press UTILITY , then Service , then Adjustments , then click IF Gain System Adjustment.
Page 73: Source Adjustment
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Adjustments Source Adjustment The source calibration is used to adjust your network analyzer for a flat source power across its full frequency range. There are differences between each test port; therefore, an adjustment is required for each port.
Page 74: Receiver Adjustment
Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A Receiver Adjustment The receiver calibration is used to adjust the network analyzer receivers for a flat response across its full frequency range: 1. A power meter/sensor is connected to Port 1, as shown in Figure 3-15, to establish a reference for flatness.
Page 75 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Adjustments Figure 3-15 Equipment Setup 1 for the Receiver Adjustment Service Adjustments 2. Press UTILITY , then , then , then click Receiver System Adjustment. 3. Ensure the GPIB settings are correct. 4.
Page 76 Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A Figure 3-17 Equipment Setup 3 for the Receiver Adjustment 3-42 Service Guide N5242-90001...
Page 77: Receiver Characterization
PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Adjustments Receiver Characterization This characterizes the receivers in your analyzer. Procedure 1. Press UTILITY , then Service , then Adjustments , then click Receiver System Characterization. 2. Follow the instructions and prompts as they are displayed. EE Default Adjustment This sets the EEPROM data to their default values.
Page 78: Noise Figure Adjustment (Available Only With Option 029 Installed)
Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A Noise Figure Adjustment (Available Only with Option 029 Installed) The noise figure adjustment should be performed after replacing any component in the noise figure circuitry, or if the PNA fails the noise IF gain portion of the Op check. The noise figure adjustment consists of the following three sections: •...
Page 79 PNA Series Microwave Network Analyzers Tests and Adjustments N5241A/42A Adjustments Figure 3-18 PNA Noise Adjustment Dialog Box 3. Click Begin. 4. As shown in Figure 3-19, connect an RF cable between the network analyzer test ports 1 and 2. Figure 3-19 Equipment Setup 1 for the Receiver Adjustment 5.
Page 80 Tests and Adjustments PNA Series Microwave Network Analyzers Adjustments N5241A/42A Figure 3-20 Equipment Setup 2 for the Receiver Adjustment 1. When prompted, reconnect an RF cable between the network analyzer test ports 1 and 2. When prompted, disconnect the cable at port 2 and insert the ECal module between port 2 and the free end of the cable.
Page 81: Troubleshooting
Troubleshooting Service Guide N5242-90001...
Page 82: Information In This Chapter
Troubleshooting PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter The information in this chapter helps you: • Identify the portion of the analyzer at fault. • Locate the specific troubleshooting procedure to identify the assembly or peripheral at fault.
Page 83: Conventions Used For Hardkeys, Softkeys, And Menu Items
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Operating the Analyzer With Covers Removed Conventions Used for Hardkeys, Softkeys, and Menu Items The following conventions are used in this document: This represents a “hardkey”, a key that is physically located Hardkey on the instrument.
Page 84: Getting Started With Troubleshooting
Check the Basics A problem can often be solved by repeating the procedure you were following when the problem occurred. Before calling Agilent Technologies or returning the instrument for service, please perform the following checks: 1. Is there power at the mains receptacle? If not, correct this situation and proceed.
Page 85: Troubleshooting Organization
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Getting Started with Troubleshooting Troubleshooting Organization Follow the flowgraph in Figure 4-1 to help direct you to the correct section for troubleshooting the analyzer. Figure 4-1 Troubleshooting Organization Flowchart Go to “Power Up Troubleshooting” on page 4-6.
Page 86: Power Up Troubleshooting
Troubleshooting PNA Series Microwave Network Analyzers Power Up Troubleshooting N5241A/42A Power Up Troubleshooting Immediately unplug the instrument from the ac power line if the WARNING unit shows any of the following symptoms: • Smoke, arcing, or unusual noise from inside the analyzer. •...
Page 87: Power Supply Check
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Power Up Troubleshooting Power Supply Check There are no fuses to replace within the power supply. If you determine that NOTE the power supply is the failed assembly, replace the power supply. A catastrophic failure in the power supply can be determined by observing the line switch and the power supply LED indicators: 1.
Page 88 Troubleshooting PNA Series Microwave Network Analyzers Power Up Troubleshooting N5241A/42A Figure 4-2 A15 Midplane Board Power Supply LED Indicators and Measurement Points WARNING The instrument contains potentially hazardous voltages. Refer to the safety symbols provided on the instrument and in “General Safety Considerations”...
Page 89 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Power Up Troubleshooting Table 4-1 Power Supply Measurement Points Expected Expected Test Point Supply Name Test Point Supply Name Level (Vdc) Level (Vdc) TP517 Analog Ground TP516 -5.2 V analog -5.2 ±0.1 TP509 +15 V analog +15.0 ±0.1 TP514...
Page 90 Troubleshooting PNA Series Microwave Network Analyzers Power Up Troubleshooting N5241A/42A 5. Remove the A5 source board, if present (refer to “Removing and Replacing the A4–A13 Boards” on page 7-14). 6. Remove the A11 13.5 GHz synthesizer board (refer to “Removing and Replacing the A4–A13 Boards”...
Page 91 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Power Up Troubleshooting If the Fans Are Not Operating The power supply may be in thermal shutdown if the instrument has been CAUTION operating without the fans running. Allow the instrument to cool down before troubleshooting.
Page 92: Troubleshooting Lcd Display Problems
Troubleshooting PNA Series Microwave Network Analyzers Power Up Troubleshooting N5241A/42A 3. If the correct voltage is present at each connection and the fan connectors are in good mechanical condition, suspect a defective fan. Refer to “Removing and Replacing the Fans” on page 7-62.
Page 93: Front Panel Troubleshooting
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Front Panel Troubleshooting Front Panel Troubleshooting The front panel assembly consists of the A1 front panel interface board, the keypad, the A2 USB board, and the A3 display assembly. The following tests verify the operation of the front panel assembly when the analyzer is in the measurement mode.
Page 94 Troubleshooting PNA Series Microwave Network Analyzers Front Panel Troubleshooting N5241A/42A Checking the Front Panel Keys To check the front panel keys, push each key and compare the name in the Key Label box to the name physically labeled on the key cap. These names are also in Table 4-2 below.
Page 95: A3 Display Test
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Front Panel Troubleshooting Checking the RPG (Front Panel Knob) To check the RPG knob: 1. Press the UTILITY key. Preset 2. Rotate the knob and check for a fluid movement of numbers on the analyzer display. 3.
Page 96: Checking The A2 Usb Board
Troubleshooting PNA Series Microwave Network Analyzers Front Panel Troubleshooting N5241A/42A Checking the A2 USB Board To verify proper operation of the USB board: • Connect a known good USB device, such as a USB mouse, to a front panel USB port. •...
Page 97: Rear Panel Troubleshooting
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Rear Panel Troubleshooting Rear Panel Troubleshooting Each rear panel connector is associated with a hardware group in the analyzer. You can use the data at these rear panel connectors to help troubleshoot these hardware groups in addition to testing the connectors.
Page 98: Lan Troubleshooting
Troubleshooting PNA Series Microwave Network Analyzers Rear Panel Troubleshooting N5241A/42A 5. On the menu, click then point to Windows Taskbar Start Programs, National Instruments and then click to open the window. NI-488.2, Explore GPIB Measurement & Automation 6. On the left side of the window under folders: Measurement &...
Page 99 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Rear Panel Troubleshooting Ping Command The analyzer has the built-in capability of performing a “ping” operation. Ping will request the analyzer to send a few bytes of information to a specific LAN device. That device will then signal the analyzer that it has received the information.
Page 100 Troubleshooting PNA Series Microwave Network Analyzers Rear Panel Troubleshooting N5241A/42A C:>ping 141.121.69.162 Pinging 141.121.69.162 with 32 bytes of data: Reply from 141.121.69.162: bytes=32 time<10ms TTL=127 Reply from 141.121.69.162: bytes=32 time<10ms TTL=127 Reply from 141.121.69.162: bytes=32 time<10ms TTL=127 Reply from 141.121.69.162: bytes=32 time<10ms TTL=127 Ping statistics for 141.121.69.162: Packets: Sent = 4, Received = 4, lost = 0 <0% loss>.
Page 101 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Rear Panel Troubleshooting Set the IP addresses on two analyzers. The addresses can be set to anything, but they must be different. Make sure the subnet mask and gateway addresses are set to 0.0.0.0 and that the LAN is active on both analyzers.
Page 102 Troubleshooting PNA Series Microwave Network Analyzers Rear Panel Troubleshooting N5241A/42A Table 4-3 LAN Pin Definitions and Wire Color Codes Pin Number Color Pin Number Color 1 (transmit +) White/orange White/blue 2 (transmit −) 6 (receive −) Orange Green 3 (receive +) White/green White/brown Blue...
Page 103: Measurement System Troubleshooting
, then , then Help About NA... Verify that the information displayed in this screen is correct for your analyzer. If any of the information is incorrect, contact Agilent Technologies. Refer to “Contacting Agilent” on page 2-15. Service Guide N5242-90001...
Page 104 , then , then , then System If the information is incorrect for any of the pc boards, contact Agilent Technologies. Refer “Contacting Agilent” on page 2-15. Error Messages SOURCE UNLEVELED: The source ALC circuit on the A19 test set motherboard is running open-loop.
Page 105: Verifying The A, B, C, D, And R Traces (Standard S-Parameter Mode)
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode) The first step is to verify that the A, B,C, D, and R traces are present and that they are approximately level: •...
Page 106 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A • For 4-port analyzer models, traces A, B, C, D, R1, R2, R3, and R4 are displayed in eight separate data windows as shown in Figure 4-7. Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly.
Page 107: Where To Begin Troubleshooting
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting Where to Begin Troubleshooting For the purposes of troubleshooting, the analyzer block diagram is divided into the following functional groups: • the source and LO group — A10 frequency reference —...
Page 108 Click the Hardware tab, click Device Manager, and then expand Network Adapters in the resulting list. The following entry should be listed: Agilent Technologies DSP Driver #2 and should be enabled. 2. If the entry is not present or if the icon to the left of the name is a yellow box containing an exclamation mark (!), navigate the following directories and verify the presence of the following file: C:\WINNT\system32\drivers\spampnp.sys.
Page 109: Checking The Source Group
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting Checking the Source Group Source Group Tests Before checking the source group assemblies, you must open the analyzer. Use an antistatic work surface and wrist strap to reduce the chance of CAUTION electrostatic discharge for all of the procedures in this chapter.
Page 110 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A Equipment Setup 1. Before starting these checks, zero and calibrate the power meter. (See the power meter user’s guide for instructions on setting the calibration factor.) 2. If the Receiver Display ( ) is not on the analyzer screen, perform Figure 4-6 Figure 4-7...
Page 111 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting 3. Connect the spectrum analyzer to J1207. 4. Set the network analyzer for an 800 MHz CW frequency and observe the spectrum analyzer measurement. An 807.61 MHz signal should be present. 5.
Page 112 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A 6. If the signal is not present and the signal is present from “Checking the A21 HMA26.5 Output,” replace the A22 splitter. Refer to “Removing and Replacing the A22 Splitter” on page 7-32.
Page 113: Checking The Signal Separation Group
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting Checking the Signal Separation Group Before checking the signal separation group assemblies, you must open the analyzer. CAUTION Use an antistatic work surface and wrist strap to reduce the chance of electrostatic discharge for all of the procedures in this chapter.
Page 114 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A Checking Port 1, 2, 3, or 4 Power Outputs (A, B, C, or D Signals) The object of this check is to verify the power of the output signal across the entire frequency range.
Page 115 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting • A25, A26, A27, or A28 bridge • A34, A35, A36, or A37 source step attenuator • A38, A39, A40, or A41 bias tee • A29, A30, A31, or A32 test port coupler Equipment Used for These Tests Model or Alternate Model or...
Page 116 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A 6. If the 800 MHz signal is present and the analyzer has source attenuators and bias tees, reconnect the cable to the bridge and continue testing at “Checking the A34, A35, A36, and A37 60-dB Source Step Attenuators”...
Page 117: Checking The Receiver Group
PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting Checking the Receiver Group Equipment Used for These Tests Model or Alternate Model Equipment Type Part Number or Part Number Spectrum analyzer 8565E 856xE a. Must be capable of measuring signals at 7.61 MHz and 1 GHz. For all of the following checks, refer to the block diagrams at the end of this chapter and to any of the following that are appropriate: •...
Page 118 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A WARNING Procedures described in this document are performed with power supplied to the product while protective covers are removed. Energy available at many points may, if contacted, result in personal injury. 4.
Page 119 PNA Series Microwave Network Analyzers Troubleshooting N5241A/42A Measurement System Troubleshooting If the measured signal is missing on the A, B, C, or D receivers and the analyzer has receiver attenuators, continue testing at “Checking the A42, A43, A44, and A45 35-dB Receiver Step Attenuators”...
Page 120 Troubleshooting PNA Series Microwave Network Analyzers Measurement System Troubleshooting N5241A/42A — Receiver C; W61 — Receiver D; W62 — Receiver R; W63 2. Disconnect the appropriate flexible RF cable from the output receiver to be tested on the A20 IF multiplexer board. 3.
Page 121 REAR PANEL N5241A and N5242A 2-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS (Includes Options 200-Standard; 219-Attenuators and Bias Tees; 224-Source Bypass Switches; and Port 1 OPTION 200 USB x 4 029-Noise Figure) DISPLAY USB BD A20 IF MULTIPLEXER...
Page 122: Instrument Block Diagrams Sheet 1
Troubleshooting PNA Series Microwave Network Analyzers Instrument Block Diagrams Sheet 1 N5241A/42A 4-42 Service Guide N5242-90001...
Page 123 REAR PANEL N5241A and N5242A 4-Port Overall Block Diagram FRONT PANEL FRONT PANEL INTERCONNECTS INTERCONNECTS INTERCONNECTS (Includes Options 400-S tandard; 419-Attenuators and Bias T ees; 423-Source Byp ass Switches; and Port 1 OPTION 400 USB x 4 029-Noise Figure) DISPLAY...
Page 124: Instrument Block Diagrams Sheet 2
Troubleshooting PNA Series Microwave Network Analyzers Instrument Block Diagrams Sheet 2 N5241A/42A 4-44 Service Guide N5242-90001...
Page 125: Theory Of Operation
Theory of Operation Service Guide N5242-90001...
Page 126: Information In This Chapter
Theory of Operation PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter This chapter provides a general description of the operating theory of the N5241A/42A 2-port and 4-port PNA microwave network analyzers. • Theory of operation is explained to the assembly level only. •...
Page 127: Network Analyzer System Operation
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Network Analyzer System Operation Network Analyzer System Operation The PNA network analyzer generates two (2-port models) or four (4-port models) phase-locked incident signals and an LO signal from the internal synthesized source. By means of signal separation, the incident signals are divided into reference signals and test signals.
Page 128: Functional Groups Of The Network Analyzer
Theory of Operation PNA Series Microwave Network Analyzers Network Analyzer System Operation N5241A/42A Figure 5-2 2-Port System Simplified Block Diagram Functional Groups of the Network Analyzer The operation of the network analyzer can be separated into major functional groups. Each group consists of assemblies that perform a distinct function in the instrument.
Page 129 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Network Analyzer System Operation Synthesized Source Group The built-in synthesized source generates a swept, stepped, or continuous wave (CW) signal in the frequency ranges as listed in Table 5-1. The source group provides five signals: an LO signal and four incident signals.
Page 130 Theory of Operation PNA Series Microwave Network Analyzers Network Analyzer System Operation N5241A/42A Signal Separation Group Each of the incident signals from the source group is separated into a reference path and a test path. The reference signal is transmitted to the receiver group. The test signal is transmitted through—and reflected from—the DUT and is then transmitted to the receiver group.
Page 131: Synthesized Source Group Operation
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Synthesized Source Group Operation Synthesized Source Group Operation The source group produces a stable output signal by phase locking a synthesized voltage-controlled oscillator (VCO). Refer to Table 5-2 on page 5-9 for the full frequency range of the source.
Page 132 Theory of Operation PNA Series Microwave Network Analyzers Synthesized Source Group Operation N5241A/42A Figure 5-3 Source Group Service Guide N5242-90001...
Page 133 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Synthesized Source Group Operation Table 5-2 Subsweep Frequencies ➊ ➋ ➌ ➍ Mixer Brick L.O. A4/A13 A5/A8 Band Harmonic Synthesizer HMA26.5 Synthesizer Source Number Frequency (GHz) Frequency (GHz) Frequency (GHz) Frequency (GHz) 0.01254 to 0.01654 0.01254 to 0.01654 0.010 to 0.014...
Page 134: A4, A13, And A11 13.5 Ghz Synthesizer Boards
Theory of Operation PNA Series Microwave Network Analyzers Synthesized Source Group Operation N5241A/42A A4, A13, and A11 13.5 GHz Synthesizer Boards On 2-ports models, the A13 13.5 GHz synthesizer board is optional and included only with Option 224. The A4, A13, and A11 13.5 GHz synthesizer boards use the 50 MHz reference signal from the A10 frequency reference board to tune two VCO circuits: one that sweeps from 2 GHz to 4 GHz and one that is set to a fixed CW frequency of 3.4 GHz.
Page 135: A21 Multiplier/Amplifier 26.5 Board (Hma26.5)
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Synthesized Source Group Operation with an external test set. This output is terminated with a 50-ohm load on the A8 26.5 GHz source. The companion signal, EXT TEST SET DRIVE LO, is output from the A23 mixer brick. Refer to “A23 and A24 Mixer Bricks”...
Page 136: A19 Test Set Motherboard
Theory of Operation PNA Series Microwave Network Analyzers Synthesized Source Group Operation N5241A/42A A19 Test Set Motherboard The A19 test set motherboard serves these functions: • to act as an interface between the A17 CPU board and the auxiliary rear panel interconnects.
Page 137 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Synthesized Source Group Operation Table 5-3 TEST SET I/O Connector Pin Assignments DB-25 Female Connector Pin Numbers Name Function SEL0 TTL out, test set select bit 0, tied to 0 V Sweep Holdoff In TTL in, low level holds off sweep 3–6...
Page 138 Theory of Operation PNA Series Microwave Network Analyzers Synthesized Source Group Operation N5241A/42A Table 5-4 HANDLER I/O Connector Pin Assignments Rectangular 36-Pin Female Connector Pin Numbers Name Function 0 V, ground reference TTL in, negative pulse (1 μs min) latches OUTPUT1-2 INPUT1 3–4 OUTPUT1–2...
Page 139 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Synthesized Source Group Operation Table 5-5 PWR I/O Connector Pin Assignments DB-9 Female Connector Name Description +15V +15 V @ 400 mA -15V -15 V @ 400 mA AnalogOut1 Analog Output Voltage Programmable ±10 V @ 100 mA out Nominally 0 ohms 2.44 mV typical resolution...
Page 140: Signal Separation Group Operation
Theory of Operation PNA Series Microwave Network Analyzers Signal Separation Group Operation N5241A/42A Signal Separation Group Operation The signal separation group divides the source incident signals into a reference path and a test path. Refer to Figure 5-4 on page 5-18 Figure 5-5 on page 5-19.
Page 141: A25-A28 Bridges
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Signal Separation Group Operation Normal Measurement Configuration The Option 419 analyzer is equipped with configurable test set and source attenuators. With this configuration and inclusion of an external amplifier and accessories, you can calibrate the analyzer and test devices at power levels up to +30 dBm.
Page 142 Theory of Operation PNA Series Microwave Network Analyzers Signal Separation Group Operation N5241A/42A Figure 5-4 4-Port Signal Separation Group 5-18 Service Guide N5242-90001...
Page 143 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Signal Separation Group Operation Figure 5-5 2-Port Signal Separation Group Service Guide N5242-90001 5-19...
Page 144: A34-A37 65-Db Source Step Attenuators And A38-A41 Bias Tees (Optional)
Theory of Operation PNA Series Microwave Network Analyzers Signal Separation Group Operation N5241A/42A A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees (Optional) On 4-port models with Option 419 or 423, a step attenuator and a bias tee are placed in the signal path of each test port between the A25–A28 bridges and the A29–A32 test port couplers.
Page 145: Receiver Group Operation
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Receiver Group Operation Receiver Group Operation The receiver group measures and processes the input signals into digital information for processing and eventual display. Figure 5-6 on page 5-25 Figure 5-7 on page 5-26 simplified block diagrams of the receiver functional group for 2-port and 4-port analyzers respectively.
Page 146: A20 If Multiplexer Board
Theory of Operation PNA Series Microwave Network Analyzers Receiver Group Operation N5241A/42A The analog IF signal is sent to the A20 IF multiplexer board where it is processed and then sent to the A12 SPAM board. The A23 mixer brick sends the EXT TSET DRIVE LO OUT signal to a rear-panel connector for use with an external test set.
Page 147 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Receiver Group Operation Table 5-6 PULSE I/O Connector Pin Assignments DB-15 Female Connector Name Description IFGateAin IF pulse gate input A (TTL) IFGateBin IF pulse gate input B (TTL) IFGateCin IF pulse gate input C (TTL) IFGateDin IF pulse gate input D (TTL) IFGateRin...
Page 148: A12 Spam Board (Analog Description)
Theory of Operation PNA Series Microwave Network Analyzers Receiver Group Operation N5241A/42A A12 SPAM Board (Analog Description) The A12 SPAM board contains digital and analog circuitry. For digital descriptions, refer “A12 SPAM Board (Digital Description)” on page 5-32. In this assembly, the IF signals (A, B, C, D, and R for 4-port models and A, B, R1, and R2 for 2-port models) from the A20 IF multiplexer board go through a gain stage where small signals are amplified to ensure that they can be detected by the analog-to-digital converter (ADC).
Page 149 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Receiver Group Operation Figure 5-6 4-Port Receiver Group Service Guide N5242-90001 5-25...
Page 150 Theory of Operation PNA Series Microwave Network Analyzers Receiver Group Operation N5241A/42A Figure 5-7 2-Port Receiver Group 5-26 Service Guide N5242-90001...
Page 151: Noise Measurement Group Operation (Option 029)
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Noise Measurement Group Operation (Option 029) Noise Measurement Group Operation (Option 029) The noise measurement group does something. Figure 5-8 on page 5-28 is a simplified block diagram of the noise measurement group. Although the 4-port configuration is shown, the 2-port configuration is very similar.
Page 152 Theory of Operation PNA Series Microwave Network Analyzers Noise Measurement Group Operation (Option 029) N5241A/42A Figure 5-8 Noise Measurement Group (Option 029) 5-28 Service Guide N5242-90001...
Page 153: Digital Processing And Digital Control Group Operation
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Digital Processing and Digital Control Group Operation Digital Processing and Digital Control Group Operation The digital processor and control group provides digital control for the entire analyzer. It provides: • front panel operation, •...
Page 154 Theory of Operation PNA Series Microwave Network Analyzers Digital Processing and Digital Control Group Operation N5241A/42A Figure 5-9 Digital Processing and Digital Control Group 5-30 Service Guide N5242-90001...
Page 155: Front Panel Subgroup
PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Digital Processing and Digital Control Group Operation Front Panel Subgroup The front panel subgroup contains the following assemblies: • A1 Front Panel Display Board • A2 USB Board • A3 Display Assembly •...
Page 156: Data Acquisition And Processing Subgroup
Theory of Operation PNA Series Microwave Network Analyzers Digital Processing and Digital Control Group Operation N5241A/42A Data Acquisition and Processing Subgroup The data acquisition and processing subgroup contain the following assemblies. See Figure 5-9 on page 5-30. • A12 SPAM Board (Digital Description) •...
Page 157 PNA Series Microwave Network Analyzers Theory of Operation N5241A/42A Digital Processing and Digital Control Group Operation Rear Panel Interconnects The rear panel includes the following interfaces: USB x4 Four universal serial bus (USB) jacks (industry standard 4-pin connectors). GPIB (0) A 24-pin, female, type D-24 connector that meets IEEE-488 standards.
Page 158: Power Supply Group Operation
Theory of Operation PNA Series Microwave Network Analyzers Power Supply Group Operation N5241A/42A Power Supply Group Operation The A16 power supply assembly is a switching power supply operating at 103 kHz switching frequency. The input power ranges for the power supply are 90 to 132 Vac or 195 to 250 Vac.
Page 159: Replaceable Parts
Replaceable Parts Service Guide N5242-90001...
Page 160: Information In This Chapter
The definition of a rebuilt-exchange assembly. Rebuilt-Exchange Assemblies Page 6-4 The procedure for replacing and returning a defective assembly to Agilent Technologies. Tables that list the assemblies by reference designator with their associated part number and description. Illustrations that indicate the location of each of...
Page 161: Ordering Information
To order a part listed in the replaceable parts lists: • include the part number • indicate the quantity required • Contact Agilent Technologies for instructions on where to send the order. Refer to “Contacting Agilent” on page 2-15. To order a part that is not listed in the replaceable parts lists: •...
Page 162: Rebuilt-Exchange Assemblies
Replaceable Parts PNA Series Microwave Network Analyzers Rebuilt-Exchange Assemblies N5241A/42A Rebuilt-Exchange Assemblies Under the rebuilt-exchange assembly program: • Certain factory-repaired and tested assemblies are available on a trade-in basis. • Exchange assemblies are offered for lower cost than a new assembly, but meet all factory specifications required of a new assembly.
Page 163: Replaceable Parts Listings
PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Replaceable Parts Listings This section contains the replacement part numbers and their descriptions for your Agilent microwave PNA. You can find the locations of replaceable parts in this section: •...
Page 164 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Table 6-1 Part Number Location by Reference Designator (Continued) Reference Designator Description Location Port 2 bridge Port 1 port coupler Port 3 port coupler “Bottom Assemblies, Standard 4-Port Configuration, Option 400” on page 6-40 Port 4 port coupler Port 2 port coupler Reference mixer switch...
Page 165 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Table 6-2 Part Number Location by Type of Part Type of Part Location • “Front Panel Assembly, Front Side, All Options” on page 6-10 • “Front Panel Assembly, Back Side, All Options” on page 6-12 •...
Page 166 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Table 6-2 Part Number Location by Type of Part (Continued) Type of Part Location • “Top Cables, All Cables—All Options” on page 6-16 • “Bottom RF Cables, Standard 2-Port Configuration, Option 200” on page 6-20 •...
Page 167 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Table 6-2 Part Number Location by Type of Part (Continued) Type of Part Location • “Top Hardware and Miscellaneous Parts, All Options” on page 6-70 • “Bottom Hardware and Miscellaneous Parts, All Options Except 029” on page 6-72 •...
Page 168: Front Panel Assembly, Front Side, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Front Panel Assembly, Front Side, All Options Reference Designator Part Number Description N5242-20101 Front frame, diecast ➀ RFI gasket material, 1.2 meters in length 8160-0660 1.2 m (Must be ordered separately from front frame assembly.) ➁...
Page 169 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-2 Front Panel Assembly, Front Side, All Options Service Guide N5242-90001 6-11...
Page 170: Front Panel Assembly, Back Side, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Front Panel Assembly, Back Side, All Options Reference Designator Part Number Qty Description N5240-60053 Front panel interface board (until 11-15-07) Was N5240-60046 N5240-60047 USB board ➀ N5242-40001 Keypad assembly Machine screw, M3.0 x 6 pan head (9 to attach front panel interface board ➁...
Page 171 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-3 Front Panel Assembly, Back Side, All Options Service Guide N5242-90001 6-13...
Page 172: Top Assemblies, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Top Assemblies, All Options Reference Designator Part Number Description N5230-60002 13.5 GHz (source 1) synthesizer board 5087-7307 26.5 GHz source (1) board Not used. N5242-60098 Noise receiver board (Included only with Option 029.) 26.5 GHz source (2) board (On 2-port models, this assembly is 5087-7307 included only with Option 224.)
Page 173 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-4 Top Assemblies, All Options Service Guide N5242-90001 6-15...
Page 174: Top Cables, All Cables-All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Top Cables, All Cables—All Options Reference Designator Type Part Number Description A4 13.5 GHz (source 1) synthesizer board J1207 N5242-20109 to A5 26.5 GHz source (1) board P1 A13 13.5 GHz (source 2) synthesizer board J1207 N5242-20124 to A8 26.5 GHz source (2) board P1 A11 13.5 GHz (LO) synthesizer board J1207...
Page 175 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-5 Top Cables, All Cables—All Options Service Guide N5242-90001 6-17...
Page 176: Bottom Assemblies, Standard 2-Port Configuration, Option 200
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, Standard 2-Port Configuration, Option 200 Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7308 Mixer brick 5087-6308 Test port 1 bridge 5087-7315 Test port 2 bridge...
Page 177 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-6 Bottom Assemblies, Standard 2-Port Configuration, Option 200 Service Guide N5242-90001 6-19...
Page 178: Bottom Rf Cables, Standard 2-Port Configuration, Option 200
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, Standard 2-Port Configuration, Option 200 Reference Designator Type Part Number Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20092 A5 source (1) to W10 N5242-20053 W9 to A28 port 2 bridge N5242-20054...
Page 179 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-7 Bottom RF Cables, Standard 2-Port Configuration, Option 200 Service Guide N5242-90001 6-21...
Page 180: Bottom Ribbon Cables And Wire Harnesses, Standard 2-Port Configuration, Option
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Reference Designator Type Part Number Description ➀ N5242-60002 A19 test set motherboard J3 to A33 reference mixer switch ➁...
Page 181 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-8 Bottom Ribbon Cables and Wire Harnesses, Standard 2-Port Configuration, Option 200 Service Guide N5242-90001 6-23...
Page 182: Bottom Assemblies, 2-Port, Option 219 (Including Option 029)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, 2-Port, Option 219 (including Option 029) Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7139 Splitter (Option 029 only) 5087-6139 5087-7308 Mixer brick...
Page 183 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-9 Bottom Assemblies, 2-Port, Option 219 (including Option 029) Service Guide N5242-90001 6-25...
Page 184: Bottom Rf Cables, 2-Port, Option 219 Without Option 029
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 2-Port, Option 219 without Option 029 Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20092 A5 source (1) to W10 N5242-20053...
Page 185 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-10 Bottom RF Cables, 2-Port, Option 219 without Option 029 Service Guide N5242-90001 6-27...
Page 186: Bottom Rf Cables, 2-Port, Option 219 With Option 029
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 2-Port, Option 219 with Option 029 Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20092 A5 source (1) to W10 N5242-20053...
Page 187 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description W141 N5242-20129 A55 noise downconverter to A7 noise receiver board LO W142 N5242-60041 A55 noise downconverter J4 to A7 noise receiver board J9 W143 N5242-20130 A55 noise downconverter to A7 noise receiver board RF...
Page 188 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219 (including Option 029) Reference Designator Type Part Number Description ➀ N5242-60002 A19 test set motherboard J3 to A33 reference mixer switch ➁...
Page 189 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-12 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 219 (including Option 029) Service Guide N5242-90001 6-31...
Page 190: Bottom Assemblies, 2-Port, Option 224 (Including Option 029)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, 2-Port, Option 224 (including Option 029) Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7139 Splitter (Option 029 only) 5087-6139 5087-7308 Mixer brick...
Page 191 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-13 Bottom Assemblies, 2-Port, Option 224 (including Option 029) Service Guide N5242-90001 6-33...
Page 192 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 2-Port, Option 224 without Option 029 Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W95 N5242-20091 A8 source (2) to W101 N5242-20092 A8 source (2) to W115 N5242-20092 A5 source (1) to W109...
Page 193 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description W117 N5242-20114 A32 port 2 coupler to front-panel Port 2 CPLR ARM W119 N5242-20115 A38 port 1 bias tee to A29 port 1 coupler W120 N5242-20108 A41 port 2 bias tee to A32 port 2 coupler...
Page 194 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 2-Port, Option 224 with Option 029 Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W95 N5242-20091 A8 source (2) to W101 N5242-20092 A8 source (2) to W115 N5242-20092 A5 source (1) to W109...
Page 195 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description W138 N5242-20075 Front-panel REF 2 RCVR R2 IN to A23 mixer brick (R2) W139 N5242-20131 A22 splitter to A55 noise downconverter W141 N5242-20129 A55 noise downconverter to A7 noise receiver board LO W142...
Page 196 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 224 (including Option 029) Reference Designator Type Part Number Description A19 test set motherboard J102 to A47 SRC 2 OUT 1 mechanical ➀...
Page 197 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-16 Bottom Ribbon Cables and Wire Harnesses, 2-Port, Option 224 (including Option 029) Service Guide N5242-90001 6-39...
Page 198 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, Standard 4-Port Configuration, Option 400 Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7139 Splitter 5087-6139 5087-7308 Mixer brick 5087-6308 Test port 1 bridge...
Page 199 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-17 Bottom Assemblies, Standard 4-Port Configuration, Option 400 Service Guide N5242-90001 6-41...
Page 200 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, Standard 4-Port Configuration, Option 400 Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20091 A8 source (2) to W6 N5242-20051 W5 to A26 port 3 bridge...
Page 201 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description N5242-60015 A20 IF multiplexer (P603) to A12 SPAM (J5) N5242-60016 A20 IF multiplexer (P803) to A12 SPAM (J6) a. SR = semirigid coaxial cable; F = flexible coaxial cable Figure 6-18 Bottom RF Cables, Standard 4-Port Configuration, Option 400 Service Guide N5242-90001 6-43...
Page 202 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 Reference Designator Type Part Number Description ➀ N5242-60002 A19 test set motherboard J3 to A33 reference mixer switch ➁...
Page 203 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-19 Bottom Ribbon Cables and Wire Harnesses, Standard 4-Port Configuration, Option 400 Service Guide N5242-90001 6-45...
Page 204: Bottom Assemblies, 4-Port, Option 419 (Including Option 029)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, 4-Port, Option 419 (including Option 029) Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 HMA26.5) 5087-7139 Splitter 5087-6139 5087-7308 Mixer brick 5087-6308...
Page 205 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-20 Bottom Assemblies, 4-Port, Option 419 (including Option 029) Service Guide N5242-90001 6-47...
Page 206: Bottom Rf Cables, 4-Port, Option 419 Without Option 029 (Ports 1 And 2)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 419 without Option 029 (Ports 1 and 2) Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20092 A5 source (1) to W10 N5242-20053...
Page 207 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-21 Bottom RF Cables, 4-Port, Option 419 without Option 029 (Ports 1 and 2) Service Guide N5242-90001 6-49...
Page 208: Bottom Rf Cables, 4-Port, Option 419 With Option 029 (Ports 1 And 2)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 419 with Option 029 (Ports 1 and 2) Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W4 N5242-20050 W3 to A25 port 1 bridge N5242-20092 A5 source (1) to W10 N5242-20053...
Page 209 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description W142 N5242-60041 A55 noise downconverter J4 to A7 noise receiver board J9 W143 N5242-20130 A55 noise downconverter to A7 noise receiver board RF a.
Page 210: Bottom Rf Cables, 4-Port, Option 419 Without Option 029 (Ports 3 And 4)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 419 without Option 029 (Ports 3 and 4) Reference Designator Type Part Number Qty Description N5242-20091 A8 source (2) to W6 N5242-20051 W5 to A26 port 3 bridge N5242-20092 A8 source (2) to W8 N5242-20052...
Page 211 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-23 Bottom RF Cables, 4-Port, Option 419 without Option 029 (Ports 3 and 4) Service Guide N5242-90001 6-53...
Page 212: Bottom Rf Cables, 4-Port, Option 419 With Option 029 (Ports 3 And 4)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 419 with Option 029 (Ports 3 and 4) Reference Designator Type Part Number Qty Description N5242-20091 A8 source (2) to W6 N5242-20051 W5 to A26 port 3 bridge N5242-20092 A8 source (2) to W8 N5242-20052...
Page 213 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-24 Bottom RF Cables, 4-Port, Option 419 with Option 029 (Ports 3 and 4) Service Guide N5242-90001 6-55...
Page 214 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419 (including Option 029) Reference Designator Type Part Number Description ➀ N5242-60002 A19 test set motherboard J3 to A33 reference mixer switch ➁...
Page 215 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-25 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 419 (including Option 029) Service Guide N5242-90001 6-57...
Page 216: Bottom Assemblies, 4-Port, Option 423 (Including Option 029)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Assemblies, 4-Port, Option 423 (including Option 029) Reference Designator Part Number Description N5240-60043 Test set motherboard N5240-60045 IF multiplexer board 5087-7711 LO Multiplier/amplifier 26.5 (HMA26.5) 5087-7139 Splitter 5087-6139 5087-7308 Mixer brick 5087-6308...
Page 217 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-26 Bottom Assemblies, 4-Port, Option 423 (including Option 029) Service Guide N5242-90001 6-59...
Page 218: Bottom Rf Cables, 4-Port, Option 423 Without Option 029 (Ports 1 And 2)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 423 without Option 029 (Ports 1 and 2) Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W95 N5242-20092 A5 source (1) to W109 N5242-20011 A25 port 1 bridge to A33 reference mixer switch N5242-20040...
Page 219 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-27 Bottom RF Cables, 4-Port, Option 423 without Option 029 (Ports 1 and 2) Service Guide N5242-90001 6-61...
Page 220: Bottom Rf Cables, 4-Port, Option 423 With Option 029 (Ports 1 And 2)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 423 with Option 029 (Ports 1 and 2) Reference Designator Type Part Number Qty Description N5242-20091 A5 source (1) to W95 N5242-20092 A5 source (1) to W109 N5242-20011 A25 port 1 bridge to A33 reference mixer switch N5242-20040...
Page 221 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Reference Designator Type Part Number Qty Description W141 N5242-20129 A55 noise downconverter to A7 noise receiver board LO W142 N5242-60041 A55 noise downconverter J4 to A7 noise receiver board J9 W143 N5242-20130 A55 noise downconverter to A7 noise receiver board RF...
Page 222: Bottom Rf Cables, 4-Port, Option 423 Without Option 029 (Ports 3 And 4)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 423 without Option 029 (Ports 3 and 4) Reference Designator Type Part Number Qty Description N5242-20091 A8source (2) to W101 N5242-20092 A8 source (2) to W105 N5242-20033 A26 port 3 bridge to front-panel REF 3 SOURCE OUT N5242-20025...
Page 223 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-29 Bottom RF Cables, 4-Port, Option 423 without Option 029 (Ports 3 and 4) Service Guide N5242-90001 6-65...
Page 224: Bottom Rf Cables, 4-Port, Option 423 With Option 029 (Ports 3 And 4)
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom RF Cables, 4-Port, Option 423 with Option 029 (Ports 3 and 4) Reference Designator Type Part Number Qty Description N5242-20091 A8source (2) to W101 N5242-20092 A8 source (2) to W105 N5242-20033 A26 port 3 bridge to front-panel REF 3 SOURCE OUT N5242-20025...
Page 225 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-30 Bottom RF Cables, 4-Port, Option 423 with Option 029 (Ports 3 and 4) Service Guide N5242-90001 6-67...
Page 226 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 423 (including Option 029) Reference Designator Type Part Number Description ➀ N5242-60003 A19 test set motherboard J102 to A47 port 3 mechanical switch ➁...
Page 227 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-31 Bottom Ribbon Cables and Wire Harnesses, 4-Port, Option 423 (including Option 029) Service Guide N5242-90001 6-69...
Page 228: Top Hardware And Miscellaneous Parts, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Top Hardware and Miscellaneous Parts, All Options Reference Designator Part Number Description 3160-4199 ➀ 3160-4198 Fan guard ➁ 0361-1272 Fan rivet ➂ N5242-00015 Fan bracket Machine screw, M3.0 x 8, pan head (5 to attach fan bracket to chassis, 4 to ➃...
Page 229 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-33 Top Hardware and Miscellaneous Parts, Top View, All Options Service Guide N5242-90001 6-71...
Page 230: Bottom Hardware And Miscellaneous Parts, All Options Except 029
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Hardware and Miscellaneous Parts, All Options Except 029 Reference Part Qty Description Designator Number Machine screw, M3.0 x 8, pan head (4 to attach A19 test set motherboard to test set deck, 6 to attach A19 test set motherboard to stabilizer bracket, 4 to attach stabilizer bracket to A20 IF mux board, 17 to attach test set deck to chassis, 4 to attach A23–A24 mixer bricks to bottom of mixer brick...
Page 231 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-34 Bottom Hardware and Miscellaneous Parts, All Options Except 029 Service Guide N5242-90001 6-73...
Page 232: Bottom Hardware And Miscellaneous Parts, Option 029
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Bottom Hardware and Miscellaneous Parts, Option 029 Reference Part Qty Description Designator Number Bracket (For A34 port 1 and A37 port 2 source attenuators, A42 port 1 and ➀ N5242-00031 A45 port 2 receiver attenuators, and A52 port 1 and A53 port 2 switches.) Machine screw M3.0 x 6 pan head (To attach attenuator/switch brackets...
Page 233 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-35 Bottom Hardware and Miscellaneous Parts, Option 029 Service Guide N5242-90001 6-75...
Page 234: Internal Hardware And Miscellaneous Parts, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Internal Hardware and Miscellaneous Parts, All Options Reference Part Number Description Designator ➀ W1312-00051 Left side inner bracket ➁ W1312-00048 Midplane bracket ➂ N5242-00033 Right side inner bracket ➃ N5242-00001 Chassis Machine screw, M3.0 x 8, pan head (4 to attach midplane bracket to...
Page 235 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-36 Internal Hardware and Miscellaneous Parts, All Options Service Guide N5242-90001 6-77...
Page 236: External Hardware And Miscellaneous Parts, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A External Hardware and Miscellaneous Parts, All Options Reference Designator Part Number Description ➀ N5242-00014 Outer cover ➁ 5041-9611 Rear foot ➂ 0515-1619 Machine screw M4.0 x 25, pan head (To attach rear foot.) ➄...
Page 237 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-37 External Hardware and Miscellaneous Parts, All Options Service Guide N5242-90001 6-79...
Page 238: Rear Panel Assembly, All Options
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Rear Panel Assembly, All Options Item Part Number Number Description CPU board. The 2.0 GHz CPU board is shown. Refer to “Top Assemblies, All Options” on page 6-14 for part number. Hard disk drive assembly (HDDA) for 2.0 GHz A17 CPU board.
Page 239 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Figure 6-38 Rear Panel Assembly, All Options Service Guide N5242-90001 6-81...
Page 240: Miscellaneous Part Numbers
Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Miscellaneous Part Numbers Table 6-3 Part Numbers for Miscellaneous Parts and Accessories Model or Part Description Number Service Tools 1/4 inch and 5/16 inch open-end wrench, thin profile 8710-0510 5/16 inch (8 mm), open-end torque wrench;...
Page 241 PNA Series Microwave Network Analyzers Replaceable Parts N5241A/42A Replaceable Parts Listings Table 6-3 Part Numbers for Miscellaneous Parts and Accessories (Continued) Model or Part Description Number Upgrade Kits orderable by Model Number Time Domain (Option 010) N5241A/42AU-010 Frequency Offset Measurements (Option 080) N5241A/42AU-080 Scalar Calibrated Converter Measurements (Option 082) N5241A/42AU-082...
Page 242 Replaceable Parts PNA Series Microwave Network Analyzers Replaceable Parts Listings N5241A/42A Table 6-3 Part Numbers for Miscellaneous Parts and Accessories (Continued) Model or Part Description Number Rack mount kit for analyzers without handles (Option 1CM) N5241A/42A-1CM Option 1CM includes the following separately orderable items: Rack mount flange kit (for analyzers not equipped with handles) 5063-9217 Rack mount flange for use without front handles (two included in 5063-9217)
Page 243: Repair And Replacement Procedures
Repair and Replacement Procedures Service Guide N5242-90001...
Page 244: Information In This Chapter
PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Agilent Technologies PNA series microwave network analyzer. Chapter Seven at-a-Glance Section Title Summary of Content Start Page...
Page 245: Personal Safety Warnings
PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Personal Safety Warnings Personal Safety Warnings WARNING These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so. WARNING The opening of covers or removal of parts is likely to expose dangerous voltages.
Page 246: Removal And Replacement Procedures
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removal and Replacement Procedures N5241A/42A Removal and Replacement Procedures Table 7-1 List of Procedures Reference Designator Assembly Description Location Covers, outer and inner Page 7-6 Fan bracket and fans Page 7-62 Front panel assembly Page 7-8 Page 7-60...
Page 247 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removal and Replacement Procedures Table 7-1 List of Procedures (Continued) Reference Designator Assembly Description Location Port 1 test port coupler Port 3 test port coupler Page 7-38 Port 4 test port coupler Port 2 test port coupler Reference mixer switch Page 7-40...
Page 248: Removing The Covers
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing the Covers N5241A/42A Removing the Covers Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) Removing the Outer Cover This procedure is best performed with the analyzer resting on its front CAUTION handles in the vertical position.
Page 249 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing the Covers Figure 7-1 Outer and Inner Cover Removal Service Guide N5242-90001...
Page 250: Removing And Replacing The Front Panel Assembly
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Front Panel Assembly N5241A/42A Removing and Replacing the Front Panel Assembly Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 251 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Front Panel Assembly Figure 7-2 Front Panel Assembly Removal Service Guide N5242-90001...
Page 252: Removing And Replacing The A1-A3 And Other Front Panel Subassemblies
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A1–A3 and Other Front Panel Subassemblies N5241A/42A Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Tools Required • T-10 TORX driver (set to 9 in-lb) •...
Page 253 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A1–A3 and Other Front Panel Subassemblies Removing the USB Controller Board ④ 1. Disconnect the USB controller board cable (item ) from the USB controller board. ⑨...
Page 254 Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A1–A3 and Other Front Panel Subassemblies N5241A/42A Removing the A3 Display Assembly and the Touchscreen 1. Disconnect the following cables from the A1 front panel interface board: display cable ①...
Page 255 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A1–A3 and Other Front Panel Subassemblies ⑥ ⑦ 4. The display cable (item ) can be removed by removing the three screws (item ) that ⑧ attach it to the LCD display hold down bracket (item 5.
Page 256: Removing And Replacing The A4-A13 Boards
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A4–A13 Boards N5241A/42A Removing and Replacing the A4–A13 Boards Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 257 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A4–A13 Boards Figure 7-6 A4, A5, A7, A8, A10, A11, A12, and A13 Boards Removal Service Guide N5242-90001 7-15...
Page 258: Removing And Replacing The A14 System Motherboard
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A14 System Motherboard N5241A/42A Removing and Replacing the A14 System Motherboard Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 259 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A14 System Motherboard Figure 7-7 A14 System Motherboard Removal Service Guide N5242-90001 7-17...
Page 260: Removing And Replacing The A15 Midplane Board
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A15 Midplane Board N5241A/42A Removing and Replacing the A15 Midplane Board Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 261 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A15 Midplane Board Figure 7-8 A15 Midplane Board Removal Service Guide N5242-90001 7-19...
Page 262: Removing And Replacing The A16 Power Supply Assembly
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A16 Power Supply Assembly N5241A/42A Removing and Replacing the A16 Power Supply Assembly Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 263 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A16 Power Supply Assembly Figure 7-9 A16 Power Supply Assembly Removal Service Guide N5242-90001 7-21...
Page 264: Removing And Replacing The A17 Cpu Board Assembly
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A17 CPU Board Assembly N5241A/42A Removing and Replacing the A17 CPU Board Assembly Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 265 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A17 CPU Board Assembly Figure 7-10 A17 CPU Board Assembly Removal Service Guide N5242-90001 7-23...
Page 266: Removing And Replacing The A18 Gpib Board
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A18 GPIB Board N5241A/42A Removing and Replacing the A18 GPIB Board Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 267 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A18 GPIB Board Figure 7-11 A18 GPIB Board Removal Service Guide N5242-90001 7-25...
Page 268: Removing And Replacing The A19 Test Set Motherboard
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A19 Test Set Motherboard N5241A/42A Removing and Replacing the A19 Test Set Motherboard Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 269 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A19 Test Set Motherboard Figure 7-12 A19 Test Set Motherboard Removal Service Guide N5242-90001 7-27...
Page 270: Removing And Replacing The A20 If Multiplexer Board
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A20 IF Multiplexer Board N5241A/42A Removing and Replacing the A20 IF Multiplexer Board Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 271 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A20 IF Multiplexer Board Figure 7-13 A20 IF Multiplexer Board Removal Service Guide N5242-90001 7-29...
Page 272: Removing And Replacing The A21 Hma26.5
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A21 HMA26.5 N5241A/42A Removing and Replacing the A21 HMA26.5 Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 273 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A21 HMA26.5 Figure 7-14 A21 HMA26.5 Removal Service Guide N5242-90001 7-31...
Page 274: Removing And Replacing The A22 Splitter
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A22 Splitter N5241A/42A Removing and Replacing the A22 Splitter Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 275 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A22 Splitter Figure 7-15 A22 Splitter Removal Service Guide N5242-90001 7-33...
Page 276: Removing And Replacing The A23 And A24 Mixer Bricks
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A23 and A24 Mixer Bricks N5241A/42A Removing and Replacing the A23 and A24 Mixer Bricks Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 277 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A23 and A24 Mixer Bricks Replacement Procedure 1. Reverse the order of the removal procedure. If replacing the A24 mixer brick, remember to install the short circuit termination ⑤...
Page 278: Removing And Replacing The A25-A28 Bridges And Bridge Mounting Brackets
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A25–A28 Bridges and Bridge Mounting Brackets N5241A/42A Removing and Replacing the A25–A28 Bridges and Bridge Mounting Brackets Tools Required • T-10 TORX driver (set to 9 in-lb) •...
Page 279 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A25–A28 Bridges and Bridge Mounting Brackets Figure 7-17 A25 through A28 Bridges Removal Service Guide N5242-90001 7-37...
Page 280: Removing And Replacing The A29-A32 Test Port Couplers
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A29–A32 Test Port Couplers N5241A/42A Removing and Replacing the A29–A32 Test Port Couplers Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 281 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A29–A32 Test Port Couplers Figure 7-18 A29 through A32 Test Port Couplers Removal Service Guide N5242-90001 7-39...
Page 282: Removing And Replacing The A33 Reference Mixer Switch
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A33 Reference Mixer Switch N5241A/42A Removing and Replacing the A33 Reference Mixer Switch Tools Required • T-10 TORX driver (set to 9 in-lb) • T-15 TORX driver (set to 14 in-lb) •...
Page 283 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A33 Reference Mixer Switch Figure 7-19 A33 Reference Mixer Switch Removal Service Guide N5242-90001 7-41...
Page 284: Removing And Replacing The A34-A37 Source Attenuators, The A38-A41 Bias Tees, And The A42-A45 Receiver Attenuators
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees, and the A42–A45 Receiver Attenuators N5241A/42A Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees, and the A42–A45 Receiver Attenuators Tools Required •...
Page 285 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees, and the A42–A45 Receiver Attenuators Figure 7-20 Source and Receiver Step Attenuators and Bias Tees Removal Service Guide N5242-90001 7-43...
Page 286: Removing And Replacing The A38-A41 Bias Tees
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A38–A41 Bias Tees N5241A/42A Removing and Replacing the A38–A41 Bias Tees Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 287 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A38–A41 Bias Tees Figure 7-21 A38 through A41 Bias Tees Removal Service Guide N5242-90001 7-45...
Page 288: Removing And Replacing The A46-A49 Bypass Switches And The A50 Combiner
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A46–A49 Bypass Switches and the A50 Combiner N5241A/42A Removing and Replacing the A46–A49 Bypass Switches and the A50 Combiner Tools Required • T-10 TORX driver (set to 9 in-lb) •...
Page 289 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A46–A49 Bypass Switches and the A50 Combiner Figure 7-22 A46 through A49 Bypass Switches and A50 Combiner Removal Service Guide N5242-90001 7-47...
Page 290: Removing And Replacing The A51 Hard Disk Drive (Hdda)
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A51 Hard Disk Drive (HDDA) N5241A/42A Removing and Replacing the A51 Hard Disk Drive (HDDA) Certain unique files exist on the hard disk drive (HDD) that are necessary for proper operation of your analyzer.
Page 291 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A51 Hard Disk Drive (HDDA) Figure 7-23 Hard Disk Drive Assembly Replacement (2.0 GHz CPU Board) Service Guide N5242-90001 7-49...
Page 292 Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A51 Hard Disk Drive (HDDA) N5241A/42A HDDA Removal and Replacement Procedure (1.6 GHz CPU Board) Refer to Figure 7-24 for this procedure. Removal 1. Disconnect the analyzer power cord. 2.
Page 293 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A51 Hard Disk Drive (HDDA) Figure 7-24 Hard Disk Drive Assembly Replacement (1.6 GHz CPU Board) Service Guide N5242-90001 7-51...
Page 294 Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A51 Hard Disk Drive (HDDA) N5241A/42A Set Up the Agilent Administrator Password If the hard disk has been replaced, it is necessary to set up the Agilent administrator password for the analyzer.
Page 295 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A51 Hard Disk Drive (HDDA) Install Backup Files onto the New Hard Disk Drive The files that were previously saved onto a USB flash memory drive must now be installed onto the new HDD.
Page 296: Removing And Replacing The A52 And A53 Option 029 Test Port Switches
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A52 and A53 Option 029 Test Port Switches N5241A/42A Removing and Replacing the A52 and A53 Option 029 Test Port Switches Tools Required • T-10 TORX driver (set to 9 in-lb) •...
Page 297 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A52 and A53 Option 029 Test Port Switches Replacement Procedure 1. Reverse the order of the removal procedure. • Be sure to install the bias tee bracket on the new switch and reinstall the bias tee once the bracket has been reinstalled in the analyzer.
Page 298: Removing And Replacing The A54 Option 029 Test Port 2 Bridge And The A55 Option 029 Noise Downconverter
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the A54 Option 029 Test Port 2 Bridge and the A55 Option 029 Noise Downconverter N5241A/42A Removing and Replacing the A54 Option 029 Test Port 2 Bridge and the A55 Option 029 Noise Downconverter Tools Required •...
Page 299 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the A54 Option 029 Test Port 2 Bridge and the A55 Option 029 Noise Downconverter Replacement Procedure 1. Reverse the order of the removal procedure. • When reassembling the A54/A55 assembly, lay the assemblies on a flat surface while installing and tightening the interconnecting cable (adapter) to ensure that these assemblies will be flush with the side frame when installed.
Page 300: Removing And Replacing The Rear Panel
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Rear Panel N5241A/42A Removing and Replacing the Rear Panel Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 301 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Rear Panel Figure 7-27 Rear Panel Removal Service Guide N5242-90001 7-59...
Page 302: Removing And Replacing The Front Panel Led Boards
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Front Panel LED Boards N5241A/42A Removing and Replacing the Front Panel LED Boards Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 303 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Front Panel LED Boards Figure 7-28 Front Panel LED Boards Removal Service Guide N5242-90001 7-61...
Page 304: Removing And Replacing The Fans
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Fans N5241A/42A Removing and Replacing the Fans Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) • Pozidriv screw driver •...
Page 305 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Fans Figure 7-29 B1 Fan Removal Service Guide N5242-90001 7-63...
Page 306: Removing And Replacing The Lithium Battery
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Lithium Battery N5241A/42A Removing and Replacing the Lithium Battery Tools Required • T-10 TORX driver (set to 9 in-lb) • T-20 TORX driver (set to 21 in-lb) •...
Page 307 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Lithium Battery Figure 7-30 Lithium Battery Removal (2.0 GHz CPU Board) Service Guide N5242-90001 7-65...
Page 308 Repair and Replacement Procedures PNA Series Microwave Network Analyzers Removing and Replacing the Lithium Battery N5241A/42A Removal Procedure (1.6 GHz CPU Board) Refer to Figure 7-31. for this procedure. 1. Disconnect the power cord. 2. Remove the outer and inner covers. Refer to “Removing the Covers”...
Page 309 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Removing and Replacing the Lithium Battery Figure 7-31. Lithium Battery Removal (1.6 GHz CPU Board) Service Guide N5242-90001 7-67...
Page 310: Post-Repair Procedures
Repair and Replacement Procedures PNA Series Microwave Network Analyzers Post-Repair Procedures N5241A/42A Post-Repair Procedures After the replacement of an assembly, you must perform the service procedures in the order listed in Table 7-2. Procedures referenced in this table are located in Chapter 3, “Tests and Adjustments,”...
Page 311 PNA Series Microwave Network Analyzers Repair and Replacement Procedures N5241A/42A Post-Repair Procedures Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures Source Adjustment Frequency Accuracy Test Receiver Adjustment Source Power Accuracy Test Synthesizer Bandwidth Adjustment A13 13.5 GHz source 2 Source Maximum Power Output Test...
Page 312 Repair and Replacement Procedures PNA Series Microwave Network Analyzers Post-Repair Procedures N5241A/42A Table 7-2 Related Service Procedures (Continued) Adjustments Verification, Performance, Replaced Assembly and Other Procedures and Other Tests and Procedures Receiver Compression Test Noise Floor Test A23 and A24 mixer bricks Receiver Adjustment Calibration Coefficients Test Dynamic Accuracy Test...
Page 313: General Purpose Maintenance Procedures
General Purpose Maintenance Procedures Service Guide N5242-90001...
Page 314: Information In This Chapter
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Information in This Chapter N5241A/42A Information in This Chapter Chapter Eight at-a-Glance Section Title Summary of Content Start Page Error Terms How to use error terms as a preventive page 8-3 maintenance and troubleshooting tool.
Page 315: Error Terms
PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Error Terms Error Terms Using Error Terms as a Diagnostic Tool By examining error terms, you can monitor system performance for preventive maintenance and troubleshooting purposes. The magnitude and shape of the error terms are affected by: •...
Page 316: Performing Measurement Calibration
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Error Terms N5241A/42A Performing Measurement Calibration A calibration must be performed to allow the analyzer to calculate the error terms before they can be used as a tool: CAUTION Perform the following procedure only at a static-safe workstation, and wear a grounded wrist strap.
Page 317 PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Error Terms Figure 8-2 Flowgraph of Two-Port Error Terms where: E = error term 1st Subscript: D = Directivity S = Source Match R = Reflection Tracking X = Crosstalk (Isolation) L = Load Match T = Transmission Tracking 2nd Subscript:...
Page 318 General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Error Terms N5241A/42A Figure 8-3 Flowgraph of Three-Port Error Terms where: E = error term DIR = Directivity MAT = Forward Source Match and Reverse Load Match TRK = Forward Reflection Tracking and Reverse Transmission Tracking For the case of a full 3-port calibration, port 1 has three Match error terms: S11 source match...
Page 319 PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Error Terms Figure 8-4 Flowgraph of Four-Port Error Terms where: E = error term DIR = Directivity MAT = Forward Source Match and Reverse Load Match TRK = Forward Reflection Tracking and Reverse Transmission Tracking For the case of a full 4-port calibration, port 1 has four Match error terms: S11 source match...
Page 320: Accessing Error Terms
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Error Terms N5241A/42A Accessing Error Terms Error terms can be accessed either manually or programmatically: Manually • “Front Panel Access to Error Terms” on page 8-8 Programmatically • “GPIB Access to Error Terms” on page 8-9 •...
Page 321 PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Error Terms Programmatic Access to Error Terms GPIB Access to Error Terms You can access error terms by way of GPIB with Standard Commands for Programmable Instruments (SCPI). For more information on GPIB and SCPI, refer to the embedded help in the analyzer. Type in keyword “errors, systematic”...
Page 322: Error Term Data
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Error Terms N5241A/42A Error Term Data The error term descriptions in this section include the following information: • a table of the error terms • description and significance of each error term •...
Page 323 PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Error Terms Directivity (E and E and E are the uncorrected forward and reverse directivity error terms of the system. The directivity error of the test port is determined by measuring the S and S reflection of the calibration kit load.
Page 324 General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Error Terms N5241A/42A Isolation (Crosstalk) (E and E Isolation, or crosstalk, is the uncorrected forward and reverse isolation error terms that represent leakage between the test ports and the signal paths. The isolation error terms are characterized by measuring transmission (S ) with loads attached to both ports during the measurement calibration.isolation errors affect transmission measurements...
Page 325: Option Enable Utility
PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Option Enable Utility Option Enable Utility Accessing the Option Enable Utility To start the option enable utility: • Press UTILITY then Service then Option Enable System • A dialog box similar to the one illustrated in Figure 8-6 is displayed.
Page 326: Enabling Or Removing Options
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Option Enable Utility N5241A/42A Enabling or Removing Options There are two types of options: • Hardware: Hardware options involve adding additional hardware to the analyzer. After the proper hardware has been installed in the analyzer, the option can be enabled using the option enable utility.
Page 327: Repairing And Recovering Option Data
PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Option Enable Utility Repairing and Recovering Option Data License, option, and model number data are stored in an EEPROM on the frequency reference board and written into the gen.lic file on the hard disk drive. If the data stored in either of these items is lost, it can be recovered from the other item.
Page 328: Installing Or Changing A Serial Number
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Option Enable Utility N5241A/42A Installing or Changing a Serial Number It is necessary to reinstall the instrument serial number if the test set motherboard is replaced. IMPORTANT Use extreme care when entering the serial number, as only one attempt is allowed.
Page 329: Firmware Upgrades
PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Firmware Upgrades Firmware Upgrades How to Check the Current Firmware Version 1. Press UTILITY , then , then System Help About NA... A dialog box showing the current installed Application Code Version is displayed. 2.
Page 330: Operating System Recovery
General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Operating System Recovery N5241A/42A Operating System Recovery Recovering from Hard Disk Drive Problems If you suspect that you have a hard disk drive problem, go to the “Hard Drive Recovery” link on the Agilent PNA Series: Service & Support Home Page on the Internet. The URL for the Agilent PNA Series: Service &...
Page 331: Correction Constants
PNA Series Microwave Network Analyzers General Purpose Maintenance Procedures N5241A/42A Correction Constants Correction Constants The analyzer stores many correction constants in non-volatile EEPROM memory. These constants enable the analyzer to produce accurate, leveled source signals and receive clean test signals. Storing Correction Constants After performing any adjustment listed on page 3-36...
Page 332 General Purpose Maintenance Procedures PNA Series Microwave Network Analyzers Correction Constants N5241A/42A 8-20 Service Guide N5242-90001...
Page 333 Index Numerics removal and replacement procedure 7-14 illustrated 7-15 troubleshooting 4-30 010, time domain option procedure 7-14 A11 13.5 GHz LO synthesizer 020, IF inputs option board troubleshooting 4-32 021, source 1 pulse modulator illustrated 6-15 2-port configuration with 2nd option operation 5-10...
Page 334 Index troubleshooting 4-17 procedure 7-34 procedure 7-12 A18 GPIB board troubleshooting 4-38 troubleshooting 4-12 4-13 illustrated 6-15 A24 mixer brick A30 test port 3 coupler part number 6-14 illustrated 6-41 6-47 6-59 illustrated 6-41 6-47 6-59 removal and replacement operation 5-21 operation 5-17...
Page 335 Index illustrated 7-43 operation 5-21 illustrated 7-47 procedure 7-42 part number 6-24 6-32 6-46 procedure 7-46 troubleshooting 4-36 6-58 troubleshooting 4-36 A37 test port 2 source step removal and replacement A49 test port 2 mechanical switch attenuator illustrated 6-33 6-59 illustrated 7-43 illustrated...
Page 336 Index illustrated 6-25 6-33 6-47 analyzer MA 26.5 5-11 5-17 accessories 2-11 6-59 main RAM 5-32 block diagram operation 5-27 mixer brick 5-21 digital control group 5-30 part number 6-24 6-32 6-46 noise measurement group digital processor group 5-30 6-58 5-27 noise measurement group removal and replacement...
Page 337 Index procedure 7-62 illustrated 6-31 bottom assembly, Option 423/029 replaceable RF cables bandwidth, synthesizer part numbers 6-30 adjustment 3-38 illustrated 6-63 6-67 bottom assembly, Option 219/029 battery replaceable RF cables part numbers 6-62 6-66 illustrated 6-15 illustrated 6-29 bridge part number 6-14 6-82 removal and replacement...
Page 338 Index cables, flexible in top assembly, all options cable in top assembly, all options illustrated 6-17 connector repeatability, failure illustrated 6-17 part numbers 6-16 3-19 part numbers 6-16 cables, semi-rigid insertion loss, failure of 3-15 cables, RF in top assembly, all options magnitude and phase stability, in bottom assembly, Option 200 illustrated...
Page 339 Index connector part number 6-14 procedure 7-12 care removal and replacement troubleshooting 4-12 4-13 principles of illustrated 7-23 display cable quick reference removal and replacement procedure 7-22 repeatability check illustrated 7-12 7-13 troubleshooting 4-17 failure of 3-19 procedure 7-12 cross-over cable, LAN 4-21 of test port cables 3-18...
Page 340 Index monitoring over time flowgraph illustrated 6-25 6-33 6-73 of one port error terms shape affected by 6-75 of two port error terms source match 8-11 part number 6-18 6-24 6-32 typical data 8-10 6-40 6-46 6-58 6-72 using to identify error terms using as diagnostic tool 6-74 Fourier transform...
Page 341 Index front panel LED board part numbers 6-72 check illustrated 6-19 6-41 6-47 in external analyzer failure of 3-15 6-59 illustrated 6-79 test port cables 3-15 functional groups part numbers 6-78 installing fuses 6-82 a serial number 8-16 in internal analyzer instrument specifications illustrated 6-77...
Page 342 Index procedure 7-10 load match location of part numbers cause of failure 8-11 test 4-14 definition of 8-11 troubleshooting 4-13 required for servicing 2-14 measurements affected by 8-11 kits miscellaneous replaceable parts calibration 2-13 locating part numbers 6-82 assembly part numbers rack mount mixer brick hardware part numbers...
Page 343 Index noise receiver board dialog box 3-12 built-in tests for standard illustrated 6-15 failure of 3-12 compliant calibration operation 5-27 performing 3-11 Option H08, pulsed RF part number 6-14 measurements option Option 029/219, bottom assembly noise, trace noise test 3-31 analyzer replaceable RF cables Non-ANSI/NCSL Z540-1-1994...
Page 344 Index illustrated 6-37 illustrated 6-11 in top assembly, all options part numbers 6-36 part number 6-10 6-14 6-15 6-70 Option 400, bottom assembly power switch miscellaneous analyzer 6-82 replaceable RF cables part number 6-10 6-11 replaceable RF cables illustrated 6-43 in bottom assembly, part numbers 6-42...
Page 345 Index parts part numbers 6-74 functional description of in bottom assembly password functional group illustrated 6-73 Agilent administrator 7-52 operation 5-34 part numbers 6-72 performance power supply assembly tests 3-29 in bottom assembly, Option 200 illustrated 6-15 calibration coefficients 3-34 illustrated 6-19 6-41...
Page 346 Index troubleshooting 4-25 troubleshooting 4-25 4-33 replaceable cables, wire harnesses R trace typical power output 4-34 in top assembly, all options troubleshooting 4-25 receiver display illustrated 6-17 rack mount kits running the test 4-25 part numbers 6-83 part numbers 6-16 receiver group with handles, Option 1CP block diagram...
Page 347 Index replaceable parts, Option 029 replaceable wire harnesses A20 IF multiplexer board hardware, in bottom assembly in bottom assembly, Option 200 illustrated 7-29 illustrated 6-75 illustrated 6-23 procedure 7-28 part numbers 6-74 part numbers 6-22 A21 HMA26.5 replaceable RF cables in bottom assembly, Option 219 illustrated 7-31...
Page 348 Index procedure 7-42 procedure 7-48 rear panel A38 test port 1 bias tee A52 test port 1 Option 029 illustrated 7-59 illustrated 7-43 7-45 switch procedure 7-58 procedure 7-42 7-44 illustrated 7-55 touch screen A39 test port 3 bias tee procedure 7-54 illustrated...
Page 349 Index in bottom assembly, Option 400 part numbers 6-83 source 2 synthesizer board removal and replacement illustrated 6-45 required 2-14 procedure 7-14 part numbers 6-44 test equipment troubleshooting 4-32 in bottom assembly, Option 419 required 2-12 source board illustrated 6-57 tools operation 5-10...
Page 350 Index illustrated 7-43 verification 3-20 removal and replacement procedure 7-42 dialog box 3-24 illustrated 7-43 7-45 troubleshooting 4-39 example of results 3-27 3-28 procedure 7-42 7-44 step attenuator, source failure flowchart 3-26 troubleshooting 4-36 removal and replacement failure of 3-26 test port 1 bridge illustrated 7-43...
Page 351 Index illustrated 6-25 6-33 6-47 illustrated 7-43 removal and replacement 6-59 procedure 7-42 illustrated 7-43 7-45 part number 6-24 6-32 6-46 troubleshooting 4-39 procedure 7-42 7-44 6-58 test port 2 source step attenuator troubleshooting 4-36 illustrated 6-25 6-33 6-47 removal and replacement test port 4 bridge 6-59 illustrated...
Page 352 Index rear panel 5-12 troubleshooting 4-28 A47 test port 3 mechanical test set motherboard trim strip, filler switch 4-36 illustrated 6-19 6-25 6-33 front panel A48 test port 4 mechanical 6-41 6-47 6-59 illustrated 6-11 switch 4-36 operation 5-12 part number 6-10 A49 test port 2 mechanical part number...
Page 353 Index Port 2 4-34 USB board, front panel Windows 2-12 illustrated 6-13 wire harnesses Port 3 4-34 in bottom assembly, Option 200 part number 6-12 Port 4 4-34 illustrated 6-23 USB controller board using controllers to system removal and replacement part numbers 6-22 troubleshoot...
Page 354 Index Index-22 Service Guide N5242-90001...

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