Keysight Technologies N52 Series User's And Service Manual
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Keysight Technologies N52 Series User's And Service Manual

Keysight Technologies N52 Series User's And Service Manual

Millimeter head controller
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N5261A and N5262A
Millimeter Head Controller
The N5261/62A Millimeter Head Controller was designed for use with the N52xx Network Analyzer family and
banded millimeter-wave system solutions.
USER'S AND SERVICE GUIDE

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Summary of Contents for Keysight Technologies N52 Series

  • Page 1 N5261A and N5262A Millimeter Head Controller The N5261/62A Millimeter Head Controller was designed for use with the N52xx Network Analyzer family and banded millimeter-wave system solutions. USER'S AND SERVICE GUIDE...
  • Page 2 No additional DOCUMENT THAT CONFLICT WITH government requirements THESE TERMS, THE WARRANTY beyond those set forth in the © Keysight Technologies, Inc. 2011, TERMS IN THE SEPARATE EULA shall apply, except to the 2014-2016, 2019, 2020, 2023 AGREEMENT WILL CONTROL.

  • Page 3: Table Of Contents

    Table of Contents Chapter 1 - Installation and System Operation Introduction Description Verifying Your Shipment Test Set Accessories General Specifications General Characteristics Front Panel Features Rear Panel Features Available Fuses Network Analyzer Requirements System Configurations PNA Based Configurations PNA-X Based Configurations System Accessory Information N5261A Interface Kits N5262A Interface Kits...
  • Page 4 2 Service Information 49 Part Replacement and Location Information Replaceable Parts Test Set Diagrams and Graphics Theory of Operation Functional Block and Assembly Information Troubleshooting the Test Set Troubleshooting, DC Level Power Supply and Fans Overcurrent LEDs are ON (Amber) Front Panel Active and Port Status LED Troubleshooting, RF Level RF Out Failures...
  • Page 5 2 Service Information claration of Conformity Statement of Compliance Before Applying Power Connector Care and Cleaning Precautions Regulatory Information Instrument Markings Battery Collection Electrical Safety Compliance EMI and EMC Compliance Electrical Discharge Protection Keysight Support, Services, and Assistance Contacting Keysight Shipping Your Product to Keysight for Service or Repair Keysight N5261/62A User’s &...

  • Page 6: Chapter 1 - Installation And System Operation

    Installation & System Operation Keysight N5261/62A User’s & Service Guide...

  • Page 7: Introduction

    This section of this document describes system installation and operation of the N5261A/N5262A Millimeter Module Controller. Note: This document contains references to Agilent. Please note that Agilent’s Test and Measurement business has become Keysight Technologies. For more information, go to www.keysight.com. 2-Port Banded Millimeter-wave Configuration (N5261A)

  • Page 8: Description

    “Contacting Keysight” on page 92. Keep the damaged shipping materials (if any) for inspection by the carrier and a Keysight Technologies representative. The N5261/62A Millimeter Head Controller and the millimeter-wave modules are sensitive to electrostatic discharge (ESD). Ground your work station before unpacking and installing the millimeter-wave modules.

  • Page 9: Test Set Accessories

    Installation & System Operation Test Set Accessories Use the tables below to verify that your shipment is complete. Table 1-1 N5261/62A Standard Content √ Keysight Ref Des Description Part Number N5261A or Millimeter Head Controller Test Set N5262A 1810-0118 Coax Termination, 50 Ohm, male (load) (N5261A) 1810-0118 Coax Termination, 50 Ohm, male (load)

  • Page 10: General Specifications

    Installation & System Operation General Specifications Specifications for the test set are characteristic of the test set. A functional certificate is only offered for the test set. A periodic calibration of the test set is not required. General Characteristics Environmental: Temperature 20 to 30 °C Altitude...
  • Page 11 Installation & System Operation Table 1-3 Characteristics and Specifications Power Levels (dBm) Gain Frequency Front/Rear Panel Connector N5261A TEST or REF IF (Input) (characteristic) − −27 −10 − 7.6 MHz TEST IF to A/B/C/D IF OUTPUT (specification) − − − −1.5 dB (±...

  • Page 12: Front Panel Features

    Installation & System Operation Front Panel Features Figure 1-3 N5261A (2-Port) Front Panel Features LO Out SRC1 Input Port Status LEDs RF Out Ref IF Test IF Active Standby Switch Over Current LEDs DC Power Figure 1-4 N5262A (4-Port) Front Panel Features SRC1 and SRC2 Inputs Port Status LEDs LO Out...
  • Page 13 Installation & System Operation TEST IF IF signal input connection from the millimeter module’s Test or Measure IF Output. REF IF Reference IF signal input connection from the millimeter module’s Reference IF Output. RF OUT Provides an amplified RF source signal to the millimeter-wave module’s RF Input.

  • Page 14: Rear Panel Features

    Installation & System Operation Rear Panel Features Figure 1-5 N5261A Rear Panel Features IF Outputs D, C, B, A LO IN SRC1 IN/OUT Line Module Test Set I/O Pass Thru Interface Chassis Ground Figure 1-6 N5262A Rear Panel Features IF Outputs LO IN SRC2 IN/OUTSRC1 IN/OUT Line Module...
  • Page 15 Installation & System Operation IF OUTPUTs – SMA (female) — D (from the test set to the analyzer’s IF D Input) — C (from the test set to the analyzer’s IF C Input) — R (from the test set to the analyzer’s IF R Input, not installed in the N5261A) —...

  • Page 16: Available Fuses

    Installation & System Operation Power Cords A line power cord is supplied in one of several configurations, depending on the destination of the original shipment. Keysight can supply additional certified power cords to meet region electrical supply and receptacle configurations. Please refer to our website at: http://www.keysight.com assistance in power cord selection.

  • Page 17: Network Analyzer Requirements

    Installation & System Operation Network Analyzer Requirements The required options for PNA models are indicated in the “PNA Option(s)” column of Table 1-4. The required options for PNA-X models are indicated in the “PNA Option(s)” column of Table 1-5. Note that all models require Option 020.

  • Page 18: System Configurations

    Installation & System Operation System Configurations Table 1-4 Table 1-5 document all supported configurations for S-Parameter measurement capabilities for banded mm-wave systems using the N5261A and N5262A test sets. Capabilities: [C1]=pulse, [C2]=power control/RCVR leveling, [C3]=SMC+phase, [C4]=SPM, [C5]=ITSMA Table 1-4 PNA Based Configurations PNA Model Test Set Cable Interface...

  • Page 19: Pna-X Based Configurations

    Installation & System Operation Table 1-5 PNA-X Based Configurations PNA-X Test Set Cable Interface Cable Capabilities and Model (s) Connects Config. Notes Option(s) Diag(s) N5242A/B N5261A front N5261A-102 [C1,C2,C3,C4__] N5262A front N5262A-102 [C1,C2__C4,__] 200 & 224 N5261A front N5261A-102 [C1,C2,C3,C4__] rear N5261A-102 [C1,C2,C3,C4,__]...
  • Page 20 Installation & System Operation Table 1-5 PNA-X Based Configurations (Continued) PNA-X Test Set Cable Interface Conn. Capabilities and Model (s) Connects Notes Option(s) Diag(s) N5247A/B N5261A front N5261A-112 [C1,C2,C3,C4__] rear N5261A-102 [C1,C2,C3,C4__] N5262A front N5262A-112 [C1,C2,C3,C4__] rear xxxx xxxx config not available 200 &...

  • Page 21: System Accessory Information

    Installation & System Operation System Accessory Information The following tables provide information on available measurement system interface options. N5261A to the Module Cable Set Options (Sold Separately) Table 1-6 Keysight Ref Des Description √ Part Number N5261A Option 102 (Interface Kit for 2-Port PNA N5222/42A/B) 5061-9038 Coax Flex CA-Assy - SMA (m/m), 520 mm (20 in), rear panel connections...

  • Page 22: N5262A Interface Kits

    Installation & System Operation Table 1-6 N5261A to the Module Cable Set Options (Continued) U3021-60003 Lock Link Kit, Test Set to PNA N5261A Option 114 (Interface Kit for the 4-Port N5227/47A/B) 5061-9038 Coax Flex CA-Assy - SMA (m/m), 520 mm (20 in), rear panel connections N5262-20026 Coax Rigid CA-Assy, SMA male to 2.4 mm female (SRC1 to Port 1 PNA)

  • Page 23: (Src2 To Pna Src2 (Out1))

    Installation & System Operation Table 1-7 N5262A to the Module Cable Set Options (Continued) N5262-20025 Coax Rigid CA-Assy, SMA male to 2.4 mm female (SRC2 to Port 2 PNA) N4903-61250 Coax Adapter (3.5 mm female to 2.4 mm male) U3021-60003 Lock Link Kit, Test Set to PNA N5262A Option 108 (Interface Kit for the 4-Port N5224/25/44/45A/B) 5061-9038...

  • Page 24: Test Set To The Module Cable Sets

    Installation & System Operation Table 1-8 Test Set to the Module Cable Set Options (Sold Separately) Keysight Description √ Part Number N5261/62A Option 501 (1-Port Trans/Refl Cable Set (48 inches = 1.2 meter)) 1250-2604 Coax Connector Adapter, right angle- SMA m/f 8121-1221 Coax flex CA-Assy, 3.5 mm male to male, 1.2 m (48 in) - RF &...

  • Page 25: Compatible Mm-Wave Modules

    Installation & System Operation Compatible mm-wave Modules Keysight offers millimeter modules manufactured by Olsen Microwave Labs (OML) and Virginia Diodes Inc (VDI) for use with the N5261/62A for banded mm-wave network analyzer systems. Refer to Table 1-9 on page 21 Table 1-10 on page Transmission/Reflection millimeter-wave modules contain an RF source multiplier, dual directional coupler, reference downconverter and a test...

  • Page 26: Available Oml Modules

    Installation & System Operation Table 1-9 Available OML Modules Banded Freq Port Type Source Receiver Model # Notes Ranges (GHz) 33 to 500 Waveguide √ √ N5256AWxx T/R Module 33 to 500 Waveguide √ N5257ARxx Receiver 33 to 500 Waveguide Dual N5258ADxx Receiver-Dual...

  • Page 27: Cable Loss Between The Test Set And The Module

    Installation & System Operation Cable Loss Between the Test Set and the Module If the cables between the test set and the millimeter-wave modules are longer than four feet, cable loss for the RF and LO paths may be excessive. Perform the analysis recommended below.

  • Page 28: System Configuration And Operation

    Installation & System Operation System Configuration and Operation Site Preparation Install the instrument so that the detachable power cord is readily identifiable and is easily reached by the operator. An externally installed switch or circuit breaker (which is readily identifiable and is easily reached by the operator) should be used as the disconnecting device.The detachable power cord can also be used to disconnect the mains circuits from the mains supply before other parts of the instrument.

  • Page 29: System Setup

    Installation & System Operation System Setup It is recommended that you connect the cables to the rear panel of the test set before mounting the analyzer on top of the test set. When the analyzer is mounted on the test set, the back of the analyzer extends over the rear panel of the test set and may interfere with access to the rear panel connectors.
  • Page 30 Installation & System Operation Figure 1-10 Rear Bottom Feet Standoffs (x2) Feet (x4) 3. Install the two rear locking feet from the (5023-0132) onto the analyzer, where the standoffs were removed. Figure 1-11 Install Locking Feet on Network Analyzer Locking Foot from Kit (5023-0132) 4.
  • Page 31 Installation & System Operation Figure 1-12 Rear Locking Feet (N5222A/B or N5242A/B) N5242-20139 N5242-20138 0515-2317 (x2) Keysight N5261/62A User’s & Service Guide...
  • Page 32 Installation & System Operation 6. Place the analyzer on top of the test set and ensure that the front frame of the analyzer is positioned slightly forward of the locks that are attached to the test set. Slide the analyzer back so the locks engage the front frame of the analyzer.
  • Page 33 Installation & System Operation Figure 1-14 Locking Feet Screws Locking Screw Locking Screw N4011-21002 Keysight N5261/62A User’s & Service Guide...

  • Page 34: Rear Panel Connections

    Installation & System Operation Rear Panel Connections Rear panel connections are documented in Figure 1-15 through Figure 1-20. Refer to Table 1-4 on page 13 Table 1-5 on page 14 to determine which figure applies to your configuration. Figure 1-15 N5261A Rear Panel Configuration A From: D/R2...
  • Page 35 Installation & System Operation Figure 1-16 N5262A Rear Panel Configuration B From: D/R2 C/R1 Test Set I/O LO OUT (J5) PNA/PNA-X To: N5262A Test Set I/O LO IN Controller Keysight N5261/62A User’s & Service Guide...
  • Page 36 Installation & System Operation Figure 1-17 N5261A Rear Panel Configuration C From: D/R2 C/R1 Test Set I/O LO OUT (J5) SW SRC PNA/PNA-X OUT (J11) To: N5261A Test Set I/O LO IN SRC 1 RF IN (Port1 Controller SW SRC) 1.
  • Page 37 Installation & System Operation Figure 1-18 N5262A Rear Panel Configuration D From: D/R2 C/R1 Test Set LO OUT SW SRC SW SRC PNA/PNA-X (J5) OUT (J8) OUT (J11) To: N5262A Test Set LO IN SRC 2 RF IN (SRC SRC1 RF IN Controller 2 SW SRC) (Port 1 SW SRC)
  • Page 38 Installation & System Operation Figure 1-19 N5261A Rear Panel Configuration E From: D/R2 C/R1 Test Set I/O LO OUT (J5) RF 1 OUT PNA/PNA-X (J6) To: N5261A Test Set I/O LO IN SRC 1 RF IN (Port Controller 1 SW SRC) Keysight N5261/62A User’s &...
  • Page 39 Installation & System Operation Figure 1-20 N5262A Rear Panel Configuration F From: D/R2 C/R1 Test Set LO OUT (J5) RF 2 OUT RF 1 OUT PNA/PNA-X (J12) (J6) To: N5262A Test Set LO IN SRC 2 RF IN SRC1 RF IN Controller (SRC 2 SW SRC) (Port 1...

  • Page 40: Pna And Pna-X Front Panel Connections

    Installation & System Operation PNA and PNA-X Front Panel Connections Some system configurations require SRC connections between the analyzer’s ports and the front panel of the test set. Refer to Table 1-4 on page 13 Table 1-5 on page 14 to determine if these connections are necessary for your configuration.

  • Page 41: Millimeter-Wave Module Cable Connections

    Installation & System Operation Millimeter-wave Module Cable Connections Before connecting the millimeter-wave modules, verify that the test set and the power supplies (if used) are powered down. There are four RF cables for each T/R module. Cables provided with the VDI modules are pre-labeled.
  • Page 42 Installation & System Operation The following detailed instructions are for connecting an OML T/R module. These instructions assume a cable dress kit (black sleeving) is available. Modify the instructions appropriately for other types of modules. 1. Prepare the cable bundle comprised of five cables listed in Table 1-13.
  • Page 43 Installation & System Operation 4. Select a Millimeter-wave module and place it on the work surface in front of the test set. 5. Connect the bundle of cables to the module in the following order. Millimeter Head Connections Table 1-14 Order Module (OML) +12 V...

  • Page 44: Configuring The Network Analyzer Firmware

    Installation & System Operation Configuring the Network Analyzer to Millimeter Mode This section will describe how to set up and operate the N5261/62A Millimeter Head Controller with your network analyzer. The N5261/62A Millimeter Head Controller is considered a “secondary” instrument. A network analyzer must be used to control the test set. Before turning on this instrument, verify that the AC supply voltage is in the specified range.
  • Page 45 Installation & System Operation Millimeter Mode The Millimeter mode allows you to configure the system for the millimeter-wave module you are using. Refer to the analyzer’s Help menu for more information. The following instructions assume the system has not been configured for the desired heads.
  • Page 46 Installation & System Operation 9. Select or clear the "Route PNA RF to rear panel 'RF OUT'” check box as indicated in Table 1-4 on page 13 Table 1-5 on page 10. Set the ALC mode according to the following information: For most applications the ALC mode should be on “Enable Test Set RF ALC”...

  • Page 47: System Operation Verification

    Installation & System Operation System Operation Verification — The Banded System Check verifies the configured system is operating correctly. It requires all system components. — If a problem is suspected with the N5261A or N5262A test set, refer to "Part Replacement and Location Information” on page 50 “Troubleshooting the Test Set”...
  • Page 48 Installation & System Operation Procedure This procedure assumes that you have a Transmission/Reflection module on each port. If not, the procedure will have to be modified appropriately. The Operational Check procedure verifies that the banded system is connected correctly and the modules, test set and analyzer are operating properly. 1.
  • Page 49 Installation & System Operation Figure 1-29 Banded System Check 5. Measure a Thru Connection. a. Connect the Port 1 to Port 2 module, and Port 3 to Port 4 module (N5262A) to form thru connections. b. Delete the trace 1, S11. Select Trace/Chan > Trace > Delete Trace. c.
  • Page 50 Installation & System Operation Figure 1-30 Uncalibrated S12 and S21 Keysight N5261/62A User’s & Service Guide...
  • Page 51 Installation & System Operation 6. Measure the Dynamic Range of each Millimeter-wave module. a. Measure S11 for a 1-Port system, or S12 and S21 for a 2-Port system, or S12, S21, S34 and S43 for a 4-Port system. b. Select [Avg] > IF Band width [10] > [Enter]. c.

  • Page 52: System Level Troubleshooting

    Installation & System Operation System Level Troubleshooting If the System Operation Verification procedure fails, perform the following procedure to isolate the problem. Refer to the Keysight PNA Series: firmware, Upgrades, and Support at: http://na.support.keysight.com/pna for further information. To request service, please contact your local service center. In the US, call 800-829-4444.
  • Page 53 Keysight N5261/62A User’s & Service Guide...

  • Page 54: Service Information

    Service Information Keysight N5261/62A User’s & Service Guide...

  • Page 55: Part Replacement And Location Information

    Service Information Part Replacement and Location Information There are many other repair and calibration options available from the Keysight Technologies support organization. These options cover a range of service agreements with varying response times. Contact Keysight additional information on available service agreements for this product.

  • Page 56: Test Set Diagrams And Graphics

    Service Information Test Set Diagrams and Graphics Figure 2-1 N5261A Test Set Diagram Keysight N5261/62A User’s & Service Guide...
  • Page 57 Service Information Figure 2-2 N5262A Test Set Diagram Keysight N5261/62A User’s & Service Guide...
  • Page 58 Service Information Figure 2-3 N5261A RF and LO Block Diagram 1. Refer to Figure 2-1 on page 51 for IF paths. Keysight N5261/62A User’s & Service Guide...
  • Page 59 Service Information Figure 2-4 N5262A RF and LO Block Diagram N5262A RF Block Diagram Rear Front Panel Panel SRC 2 IN 8 to 19 GHz Solid State Sw. SRC 2 ½ RF Section 5087-7733 Port 3 & 4 RF Amp Isolator Dir Coupler 0955-1595...
  • Page 60 Service Information Figure 2-5 Signal Routing 2-Port Keysight 2-Port mm-wave System Keysight 2-Port PNA Rear Panel Connections IF MUX IF In Port 1 Port 2 SCR 1 Out/In SCR 1 IF Out Input Input Keysight N5261A 2-Port mm-WaveTest Set Controller Amp1 Amp1 Amp1...
  • Page 61 Service Information Figure 2-7 N5261A Top View Isolator Port 1 & 2 RF Switch Isolator RF Mod/Amp Slope Attn Cable Assy Coupler Power Divider LO Mod/Amp Preamp Interface Bd Test Set Power Supply LEDs Controller Bd Keysight N5261/62A User’s & Service Guide...
  • Page 62 Service Information Figure 2-8 Sloped Attenuator Cable Assembly Keysight N5261/62A User’s & Service Guide...
  • Page 63 Service Information Figure 2-10 N5262A Top View Isolator (x4) Port 3 & 4 Mod/Amp LO Mod/Amp Slope Atten Cable Assy Test Set Interface Bd Controller Bd. Port 1 & 2 ALC Amp 1. Refer to Figure 2-2 on page 52 for IF cable routing between the Interface board and the front and rear panels.
  • Page 64 Service Information Figure 2-11 N5261/62A Bottom View Toriod Filter DC Power Wire Harnesses DC Power LED Cable DC Power Dist. Board Fuse Assembly Power Supply Line Module 1. N5261A will only have two DC power wire harnesses. Keysight N5261/62A User’s & Service Guide...

  • Page 65: Theory Of Operation

    Service Information Theory of Operation Functional Block and Assembly Information The N5261A/62A routes PNA-X LO and RF signals to a millimeter-wave module. This allows the PNA-X to up-convert for a millimeter-wave source and down-convert a received millimeter-wave frequency to an IF frequency 7.6 MHz.
  • Page 66 Service Information DC Power Board (N5261-60102) The DC Power board provides connection to the power supply and self recovering fuses for each millimeter-wave module supply (+12 volt) on the front panel. The fuses are reset when the N5261/62A is turned off. Power Supply (0950-4729) The power supply (0950-4729) coverts the AC line voltages to DC.
  • Page 67 Service Information Coupler (0955-0148) Directional couplers with 10 dB coupling factor are used for ALC feedback for RF and LO Output leveling. Slope Attenuator Cable Assy (N5262-20033) A slope pad is installed on the leveling coupler of the RF Out path to compensate for the RF switch loss at higher frequencies.

  • Page 68: Troubleshooting The Test Set

    Service Information Troubleshooting the Test Set For assistance refer to “Keysight Support, Services, and Assistance” on page If the test set is not operating properly, use the following procedures to aid in isolating the problem. Refer to the “Test Set Diagrams and Graphics” starting on page Troubleshooting, DC Level...
  • Page 69 b. If no DC voltages are present at the front panel, remove the top and bottom covers. c. Inspect the DC Power board (N5261-60002) connections. d. Measure the +12 Vdc (red wires) on the DC Power board. If the +12 Vdc is present, replace the DC power cable from the front panel (N5652-60001).

  • Page 70: Overcurrent Leds Are On (Amber)

    Service Information Overcurrent LEDs are On (Amber) 1. Remove all millimeter module connections from the front panel. If the over current LEDs are off, suspect the millimeter module or the DC Power Bias cable. If the LEDs are on continue with step 2 2.
  • Page 71 Service Information Table 2-1 Interface Board DC Power Distribution Details Ref Des Load DC Voltage DC Source RF Amp1 2, −2, 9, 15, −15 Main PS U22 & U23 RF Amp2 2, −2, 9, 15, −15 Main PS U22 & U23 LO Pre Amp Main PS LO Amp...

  • Page 72: Troubleshooting, Rf Level

    Service Information Troubleshooting, RF Level RF Out Failures If the test ports are not switching, or fail the Operational Check the following procedures can be used to verify the failure. The procedures assume power supplies, controller board and front panel LEDs are working. Suspect the switch Interface board, ribbon cable connection or RF switch.

  • Page 73: Ref If Or Test If Failure

    Service Information If you suspect the LO Amp (5086-7771), substitute the RF Amp (5086-7771) to verify the failure. The LO Amp uses a leveling circuit with directional coupler and detector that also can be checked before replacing the LO Amp. You may also substitute the Directional Coupler and Detector from the RF Amp section.

  • Page 74: Power Sensor And Power Meter Preparation

    Service Information — Voltmeter — Power sensor and compatible power meter. The power sensor must be capable of measuring from −10 dBm to +15 dBm at a frequency of 8 GHz. A E4413A power sensor may be used. Power Sensor and Power Meter Preparation The power sensor and power meter must be prepared to make measurements at 8 GHz.

  • Page 75: Test Set I/O Commands

    Service Information Test Set I/O Commands When troubleshooting the Test Set, I/O commands issued by the PNA will be used. Controlling the Test Set Using Test Set I/O Commands A Test Set I/O command may be used when the PNA is connected to the Test Set via the Test Set I/O cable.

  • Page 76: Test Set I/O Command List

    Service Information Test Set I/O Command List The following commands are available for controlling/reading the test set. The step-by-step commands in the Part Replacement and Location Information procedure require the use of these commands. The user is required to select the appropriate command, depending on the port or function under test.
  • Page 77 Service Information Measure LO OUT (Gain and Power) Prepare the PNA to measure S12 with a normalization calibration. Refer to “PNA Normalization Calibration” on page 69. Use a frequency range of 8 to 20 GHz and a power level of −10 dBm. The cable on PNA Port 2 must be long enough to reach the rear panel of the test set.
  • Page 78 Service Information Measure the SRC1 & SRC2 RF Paths The following procedure verifies SRC1 and SRC2 internal cables between the front and rear panels. Prepare the PNA to measure S12 with a normalization calibration using a frequency range of 8 to 20 GHz and a power level of −8 dBm. See “PNA Normalization Calibration”...
  • Page 79 Service Information 3. Set the PNA power output level to get a power meter reading of 2 dBm ± 1dB. 4. Connect the PNA Port 2 cable to SRC1 RF IN on the front panel. 5. Issue the Test Set I/O commands 32,0 and 0,1 (enable ALC and output to Port 1).
  • Page 80 Service Information Measuring Test IF and REF IF Path Loss on the N5261A The IF paths for the N5261A are not switched, see Figure 2-1 on page The cable connected to PNA Port 1 must be long enough to reach the rear panel of the test set.
  • Page 81 Service Information Table 2-3 IF Path Measurement From: TEST IF To: N5261A Rear To: N5262A Rear Max Path Loss for Command Front Panel Panel IF OUT Panel IF OUT N5262A (dB) Port 1 TEST IF 16,8 Port 2 TEST IF 16,4 Port 3 TEST IF 16,2...
  • Page 82 Service Information Figure 2-17 Test IF Path to A, B, C or D (N5262A) Figure 2-18 Ref IF to A, B, C or D (N5262A) Figure 2-19 Ref IF to R (N5262A) Keysight N5261/62A User’s & Service Guide...

  • Page 83: Test And Adjustment Procedures

    Service Information Test and Adjustment Procedures “Test Set Operation Check” on page 68 should be performed whenever any active electronic part is replaced in the test set. Additional procedures are required when certain components are replaced. Table 2-4 indicates when additional procedures are required. The additional procedures depend on the location of the replaced component.

  • Page 84: Gain Factors In The Src Rf Paths

    Service Information Gain Factors for the SRC RF Paths Background The controller board in the test set stores gain factors for the various SRC RF paths in non-volatile memory. These gain factors are used by the PNA firmware to ensure that the SRC RF power delivered to the mm-wave head is approximately 11 dBm when the ALC is off.
  • Page 85 Service Information 11. Move the PNA Port 1 cable to Test Set Port 2 RF OUT. 12. Record the values for Port 2 in Table 2-5 on page 81 Keysight N5261/62A User’s & Service Guide...
  • Page 86 Service Information Measure Gain Factors for Ports 3 and 4 (Procedure B) Repeat the process above for Ports 3 and 4 with the following modifications: — Connect the SRC2 jumper on the rear panel. — Connect to SRC2 IN in place of SRC1 IN. —...
  • Page 87 Service Information Read Gain Factors from the Test Set (Procedure C) Issue a separate Test Set I/O read command for each entry in Table 2-5 on page 81. Record each value as it is read from the test set. As an example, to read the value for Port 2 at 10 GHz, issue the following command: 36.

  • Page 88: Adjust Alc Levels

    Service Information Adjust ALC Levels Background When a component is changed in an RF or LO signal path, it is often necessary to adjust the ALC level for the path. See Table 2-4 on page 78 for required adjustments when a part is replaced. PNA and Power Sensor Preparation A power sensor and power meter must be prepared to make measurements at 8 GHz.
  • Page 89 Service Information ALC level for LO (Procedure S) 1. Prepare the PNA and Power Sensor as described on page 2. Connect PNA Port 2 to LO IN on the rear panel of the test set. 3. Connect the power sensor to Port 1 LO OUT. 4.

  • Page 90: Safety And Information

    Service Information Safety and Information Introduction Review this product and related documentation to familiarize yourself with safety markings and instructions before you operate the instrument. This product has been designed and tested in accordance with accepted industry standards, and has been supplied in a safe condition. The documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition.

  • Page 91: Before Applying Power

    Service Information Before Applying Power Verify that the premises electrical supply is within the range of the instrument. The instrument has an autoranging power supply. If this product is not used as specified, the protection provided by the equipment could be impaired. This product must be used in a normal condition (in which all means for protection are intact) only.

  • Page 92: Connector Care And Cleaning Precautions

    Service Information Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended. Discard used batteries according to manufacturer’s instructions. For continued protection against fire hazard replace line fuse only with same type and rating. The use of other fuses or material is prohibited. These servicing instructions are for use by qualified personnel only.
  • Page 93 Service Information To prevent electrical shock, disconnect the Keysight N5261A or N5262A from mains electrical supply before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally. If flammable cleaning materials are used, the material shall not be stored, or left open in the area of the equipment.

  • Page 94: Regulatory Information

    Regulatory Information This section contains information that is required by various government regulatory agencies. Instrument Markings The instruction documentation symbol. The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation. The AC symbol indicates the required nature of the line module input power.

  • Page 95: Battery Collection

    Battery Collection Do not throw batteries away but collect as small chemical waste, or in accordance with your country’s requirements. You may return the battery to Keysight Technologies for disposal. Refer to “Contacting Keysight” on page 92 for assistance. Electrical Safety Compliance...

  • Page 96: Electrical Discharge Protection

    Service Information Electrostatic Discharge Protection Electrostatic discharge (ESD) can damage or destroy electronic components. The product is shipped in materials that prevent damage from static, and should only be removed from the packaging in an anti-static area ensuring that the correct anti-static precautions are taken. Two types of ESD protection are listed below.

  • Page 97: Keysight Support, Services, And Assistance

    Keysight for repair. If you wish to send your instrument to Keysight 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 98 This information is subject to change without notice. © Keysight Technologies 2011, 2014-2016, 2019, 2020, 2023 Print Date: April 2023 Supersedes: October 2020 www.keysight.com...

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