Page 1 This manual applies directly to Infiniium oscilloscopes with model number sufixes “B.” For Safety information, Warranties, and Regulatory information, see the pages at the back of this book.  Copyright Agilent Technologies 2001 All Rights Reserved. Agilent Model 54845B/46B Oscilloscopes...
Page 2 The Agilent Technologies Infiniium Oscilloscope Model 54845B/46B at a Glance Ease of use with high performance Acquisition and general controls start and stop the scope and do basic setup The Agilent Technologies Infiniium oscilloscopes combine unprecedented ease-of-use with high- •...
Page 3 Acquisition and Horizontal general controls controls Display and Floppy Disk Drive Graphical Interface Trigger Setup Vertical Power Auxiliary Marker and Quick Inputs Trigger Input Measurements Vertical AutoProbe Controls Interface...
Page 4 In This Book This book provides the service documentation for the Agilent Technologies 54845B/46B oscilloscope. It is divided into eight chapters. Chapter 1 provides general information and specifications. Chapter 2 shows you how to prepare the oscilloscope for use. Chapter 3 gives performance tests.
Page 5: Table Of Contents
Instruments covered by this service guide 1-2 Accessories supplied 1-3 Options available 1-4 Accessories available 1-5 Specifications & characteristics 1-7 Agilent Technologies 54845B/46B general characteristics 1-14 Recommended test equipment 1-16 Preparing for Use 2-2 Setting Up the Oscilloscope 2-3 To inspect the instrument 2-3...
Page 6 Replacing Assemblies 6-2 ESD Precautions 6-2 Tools Required 6-2 To return the instrument to Agilent Technologies for service 6-3 To remove and replace the cover 6-4 To disconnect and connect Mylar flex cables 6-5 To remove and replace the AutoProbe assembly 6-6...
Page 7 Contents To remove and replace the hard disk drive 6-21 To remove and replace the CD-ROM drive 6-23 To remove and replace the motherboard 6-24 To remove and replace the power supply 6-27 To remove and replace the fan controller board 6-29 To remove and replace the fan 6-30 To remove and replace an attenuator 6-31 To reset the attenuator contact counter 6-33...
Page 8 Contents Contents–4...
Page 9: General Information
Instruments covered by this service guide 1-2 Accessories supplied 1-3 Options available 1-4 Accessories available 1-5 Specifications & characteristics 1-7 Agilent Technologies 54845B/46B general characteristics 1-14 Recommended test equipment 1-16 General Information...
Page 10: Instruments Covered By This Service Guide
The manual for this oscilloscope will be revised as needed. If you have an oscilloscope with a newer serial number, please refer to the Agilent Technologies website and download a newer manual edition in Adobe Acrobat (pdf) format. The Agilent Technologies URL is: “www.agilent.com”.
Page 11: Accessories Supplied
• Accessory Pouch (Agilent P/N 54810-68701) • Power cord (see chapter 7, “Replaceable Parts,” for available power cords) • User's Quick Start Guide • Programmer’s Guide and Programmer’s Quick Reference • Agilent Technologies Infiniium Oscilloscope Service Guide for Agilent Models 54845B/46B (this manual) 1–3...
Page 12: Options Available
5 years return calibrations service 5 years return standards comp cal service Other options are available. See your Agilent Technologies Sales Representative. You can order multiple options, or you can order most of these options separately, using the Agilent model number or part number.
Page 13: Accessories Available
Chapter 1: General Information Accessories available Accessories available The following accessories are available for use with the Agilent Technologies Infiniium oscilloscope. Table 1-3 Accessories for the Agilent Technologies Infiniium Oscilloscope Model 54845B/46B Agilent 1144A 800 MHz Active Probe Requires Agilent 1142A power supply—Agilent 1144-61604 probe power extender also...
Page 14 Chapter 1: General Information Accessories available Agilent E2610A Keyboard Agilent E2609A Rackmount Kit Agilent E2647A Cordless Tackball Agilent E2648A Cordless Keyboard and Mouse Agilent E2612A Touchpad Pointing Device Agilent E2625A Communication Mask Test Kit Agilent 54832-68803 Service Kit (includes service software and fan safety shield) Agilent 54810-00601 Fan Safety Shield (clips onto side of chassis with cover removed) Agilent 54830-68704...
Page 15: Specifications & Characteristics
Specifications & characteristics Specifications & characteristics The following tables list the performance specifications and operating characteristics for the Agilent Technologies 54835A/45A/46A oscilloscope. Asterisks (*) denotes warranted specifications, all others are typical. Specifications are valid after a 30 minute warm-up period, ±...
Page 16 Agilent 1153A 200 MHz differential probe: 200 MHz Real Time bandwidth* 50Ω: Agilent 54845B — 1.5 GHz (2-channel mode) Agilent 54845B — 1.0 GHz (4-channel mode) Agilent 54846B — 2.25 GHz (2-channel mode) Agilent 54846B — 1.0 GHz (4-channel mode) 1 MΩ: 500 MHz...
Page 17 Chapter 1: General Information Specifications & characteristics AutoProbe Interface AutoProbe is an intelligent communication and power link between compatible probes and Infiniium scopes. AutoProbe completely configures the scope for the attached probe. For instance, it identifies the probe type and sets up the proper input impedance, attenuation ratio, probe power and offset range, as needed.
Page 18 Chapter 1: General Information Specifications & characteristics Trigger Sensitivity* Internal dc to 100 MHz: 0.5 div 100 MHz to 500 MHz: 1.0 div 500 MHz to 1 GHz: 1.5 div Auxiliary dc to 500 MHz: 300 mV ±15 V, CAT I Maximum Input Voltage* Auxiliary Minimum Pulse Width...
Page 19 Chapter 1: General Information Specifications & characteristics Display Display 8.4-inch diagonal color active matrix LCD module incorporating amorphous silicon TFTs. Active Display Area 171 mm x 128 mm (21,888 sq. mm) Waveform Viewing Area 104 mm x 159 mm (16,536 sq. mm) in Full screen mode (graphical user interface off) Display Resolution 640 pixels horizontally x 480 pixels vertically...
Page 20 Chapter 1: General Information Specifications & characteristics Frequency Range Agilent 54845B — 2-channel mode: dc to 4 GHz (Sample rate/2) Agilent 54845B — 4-channel mode: dc to 2 GHz (Sample rate/2) Agilent 54846B — 2-channel mode: dc to 4 GHz (Sample rate/2) Agilent 54846B —...
Page 21 FFT amplitude readings are affected by input amplifier roll-off (-3 dB, with amplitude decreasing as frequency increases above 500 MHz in 1 MΩ, 2.25 GHz for Agilent 54846B, 1.5 GHz in 50Ω for Agilent 54845B). CAT I and CAT II Definitions Installation category (overvoltage category) I: Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than...
Page 22: Agilent Technologies 54845B/46B General Characteristics
Chapter 1: General Information Agilent Technologies 54845B/46B general characteristics Agilent Technologies 54845B/46B general characteristics The Infiniium oscilloscopes meet the Agilent Technologies Environmental Specification (section 750) for class B-1 products with exceptions as described for temperature. General Characteristics Environmental Temperature Operating: 10°C to +40°C Nonoperating: –40°C to 70°C...
Page 23 Chapter 1: General Information Agilent Technologies 54845B/46B general characteristics 1–15...
Page 24: Recommended Test Equipment
Chapter 1: General Information Recommended test equipment Recommended test equipment The following table is a list of the test equipment required to test performance, calibrate and adjust, and troubleshoot this instrument. The table indicates the critical specification of the test equipment and for which procedure the equipment is necessary.
Page 25 Setting Up the Oscilloscope 2-3 To inspect the instrument 2-3 To connect power 2-4 To connect the mouse or other pointing device 2-5 To attach the optional cordless trackball 2-5 To attach the optional cordless keyboard and mouse 2-6 To connect the keyboard 2-6 To connect to the LAN card 2-7 To connect oscilloscope probes 2-7 To connect a printer 2-9...
Page 26 Preparing for Use This chapter shows you how to prepare the Agilent Technologies 54845B/46B oscilloscopes for use. The following areas are covered in this section. • Inspection • Setup • Connecting a signal • Cleaning Following instrument setup is a brief section covering oscilloscope operation. If you are unfamiliar with this oscilloscope's operation, refer to the User’s Quick Start Guide.
Page 27: Preparing For Use
• If the shipping container is damaged, or the cushioning materials show signs of stress, notify the carrier as well as your Agilent Technologies Sales Office. Keep the shipping materials for the carrier's inspection. The Agilent Technologies office will arrange for repair or replacement at Agilent Technologies' option without waiting for claim settlement.
Page 28: To Connect Power
Connect the power cord to the rear of the oscilloscope, then to a suitable ac voltage source. The line cord provided is matched by Agilent Technologies to the country of origin of order. Ensure that you have the correct line cord. See “Power Cables and Plug Configurations” in chapter 7.
Page 29: To Connect The Mouse Or Other Pointing Device
Chapter 2: Preparing for Use To connect the mouse or other pointing device To connect the mouse or other pointing device • Plug the mouse into the matching connector on the back panel of the oscilloscope. The mouse is included with the oscilloscope, but using it is optional. While you can operate many oscilloscope functions with only the front-panel keys and knobs, you will need the mouse to access advanced oscilloscope functions through the graphical interface, or to find out more about the oscilloscope through the built-in information system.
Page 30: To Attach The Optional Cordless Keyboard And Mouse
Chapter 2: Preparing for Use To attach the optional cordless keyboard and mouse To attach the optional cordless keyboard and mouse Connect the receivers to the PS/2 ports on the back panel of the Infiniium. Insert the green connector on the top and the purple connector on the bottom. Press the connect button on the receiver, then press the connect button on the keyboard, fully press the connect button on the bottom of the mouse.
Page 31: To Connect To The Lan Card
Chapter 2: Preparing for Use To connect to the LAN card To connect to the LAN card • Connect your LAN cable to the RJ-45 connector. Make sure the connection is secure. To connect oscilloscope probes Attach the probe BNC connector to the desired oscilloscope channel or trigger input. Push it straight on until it latches into place.
Page 32 Chapter 2: Preparing for Use To connect oscilloscope probes To disconnect the probe, push the small latch on top of the probe connector to the left, then pull the connector body away from the front panel of the oscilloscope without twisting it.
Page 33: To Connect A Printer
Chapter 2: Preparing for Use To connect a printer To connect a printer If you have a parallel (Centronics) printer, you will need a parallel printer cable, such as an Agilent C2950A (2 m) or Agilent C2951A (3 m) cable. Go to step 1. If you have a serial printer, you will need a 9-pin to 25-pin serial printer cable, such as an Agilent 34398A cable, plus the Agilent 34399A adapter kit.
Page 34: To Connect An External Monitor
Chapter 2: Preparing for Use To connect an external monitor Attach the 25-pin “D” connector to the serial input port of the printer. Tighten the thumbscrews to secure the cable. Set the printer configuration to use the serial interface. Refer to the User’s Quick Start Guide for software installation instructions.
Page 35: To Tilt The Oscilloscope Upward For Easier Viewing
Chapter 2: Preparing for Use To tilt the oscilloscope upward for easier viewing To tilt the oscilloscope upward for easier viewing • Your oscilloscope has front feet with a wire bail between the two feet, lift up the front of the oscilloscope, grasp the bail near the center, and pull it down and forward until it latches into place.
Page 36: To Power On The Oscilloscope
Chapter 2: Preparing for Use To power on the oscilloscope To power on the oscilloscope • Depress the power switch at the lower left-hand corner of the oscilloscope front panel. After a short initialization period, the oscilloscope display appears. The oscilloscope is ready to use.
Page 37: To Verify Basic Oscilloscope Operation
Chapter 2: Preparing for Use To verify basic oscilloscope operation To verify basic oscilloscope operation Connect an oscilloscope probe to channel 1. Attach the probe to the calibration output on the front panel of the oscilloscope. Use a probe grabber tip so you do not need to hold the probe. The calibration output is marked with a square wave symbol.
Page 38: To Clean The Instrument
Chapter 2: Preparing for Use To clean the instrument To clean the instrument • Clean the oscilloscope with a soft cloth dampened with a mild soap and water solution. CA UT IO N BE CAREFUL TO AVOID DAMAGING COMPONENTS! Do not use too much liquid when cleaning the oscilloscope. Water can enter the front panel keyboard, damaging sensitive electronic components.
Page 39: Testing Performance
Testing Interval 3-2 Equipment Required 3-2 Self-Test Verification 3-2 Test Record 3-3 Operating Hints 3-3 Specifications 3-3 Performance Test Procedures 3-3 To test the dc calibrator 3-4 Procedure 3-4 To test input resistance 3-6 Procedure 3-6 To test voltage measurement accuracy 3-7 Procedure 3-7 To test offset accuracy 3-11 Procedure 3-11...
Page 40: Testing Interval
Testing Performance The procedures in this section test measurement performance using Performance Specifications given in chapter 1 as performance standards. Specifications applicable to individual tests are noted at the test for reference. Testing Interval The performance test procedures may be performed for incoming inspection of the instrument and should be performed periodically thereafter to ensure and maintain peak performance.
Page 41: Test Record
Chapter 3: Testing Performance Test Record You can record the results of the performance tests in the Performance Test Record provided at the end of this chapter. The Performance Test Record lists the performance tests and provides an area to mark test results. You can use the results recorded at incoming inspection for later comparisons during periodic maintenance, troubleshooting, and after repairs or adjustments.
Page 42: To Test The Dc Calibrator
Chapter 3: Testing Performance To test the dc calibrator To test the dc calibrator The Aux Out BNC on the front panel is used for self-calibration and probe calibration. Though calibrator accuracy is not specified in the performance specifications, it must be within limits in order to provide accurate self-calibration.
Page 43 Chapter 3: Testing Performance To test the dc calibrator Figure 3-2 Set Aux Output to DC Set the output voltage Selecting DC in the Calibration Dialog Set the dc output voltage to +2.500 V using the Level spin box or the numeric keypad dialog.
Page 44: To Test Input Resistance
Chapter 3: Testing Performance To test input resistance To test input resistance This test checks the input resistance of the vertical inputs. A four-wire measurement is used to accurately measure the 50-Ω and 1-MΩ inputs. Specification: 1 MΩ ±1% and 50 Ω ±1.5% Equipment Required Equipment Critical Specifications...
Page 45: To Test Voltage Measurement Accuracy
Chapter 3: Testing Performance To test voltage measurement accuracy To test voltage measurement accuracy This test verifies the voltage measurement accuracy of the instrument. The measurement is made using dual-cursor automatic measurement so that offset errors are not a factor. A power supply provides a reference voltage to check voltage measurement accuracy.
Page 46 Chapter 3: Testing Performance To test voltage measurement accuracy Figure 3-4 Voltage Measurement Accuracy Equipment Setup Press Default Setup to set the oscilloscope to default conditions. Set all channels to dc using the Coupling key and to 1 MΩ input impedance using the Input key.
Page 47 Chapter 3: Testing Performance To test voltage measurement accuracy Scale Offset Supply Tolerance Limits ±163.8 V 2 V/div* 2.5 V 4.836 V to 5.164 V ±82 mV 1 V/div 2.5 V 4.918 to 5.082 V ±41 mV 500 mV 1.75 V 3.5 V 3.459 to 3.541 V ±16.4 mV...
Page 48: Figure
Chapter 3: Testing Performance To test voltage measurement accuracy Figure 3-7 Set the scale from the table Set the offset from the table Vertical Scaling and Offset for Voltage Accuracy Measurement To Set Vertical Scale and Position You can also use the knobs to set the vertical scale and position, but it is usually easier to use the dialog box, particularly for the fine position setting.
Page 49: To Test Offset Accuracy
Chapter 3: Testing Performance To test offset accuracy To test offset accuracy This test checks the vertical offset accuracy. Specification: ±(1.00% of channel offset + 1% of full scale) at full-resolution channel scale Equipment Required Equipment Critical Specifications Recommended Model/Part 0.5 V to 2 Vdc, ±1 mV accuracy Power Supply Agilent 6114A...
Page 50 Chapter 3: Testing Performance To test offset accuracy Set the supply voltage to 2.00 V as in the first row of the table. Use the DVM to verify the setting. Re-adjust the vertical position, if necessary, so the trace is as close to the horizontal center line of the grid as possible after it has settled (averaging complete).
Page 51: To Test Bandwidth
To test bandwidth To test bandwidth This test checks the bandwidth of the oscilloscope. The Agilent 54845B bandwidth at 1.5 GHz and the Agilent 54846B bandwidth at 2.25 GHz oscilloscopes are checked using aliasing since the trigger specification of these oscilloscopes is 1 GHz. The 1.5 GHz or the 2.25 GHz signal is viewed with a time/division setting of approximately 50 µs/div where the on-screen display is an...
Page 52: Real Time Test
(Use this step for model 54846B 2250 MHz Equivalent Time bandwidth check.) Set the sweep speed to 50 µs/div using the Horizontal sweep speed knob c (Use this step for Real Time bandwidth checks: 1500 MHz on 54845B, or 2250 MHz on 54846B) Set the sweep speed to 500 ps/div using the Horizontal sweep speed knob.
Page 53: Mω, 500 Mhz Test
To test bandwidth Select Acquisition from the Setup menu. Select Real Time sampling mode, 8 GSa/s (Agilent 54845B and 54846B) configuration, then click Close. Repeat steps 4 through 19, testing channels 1 and 3 to the 2.25 GHz limit (54846B), 1.5 GHz limit (Agilent 54845B).
Page 54: To Test Time Measurement Accuracy
Chapter 3: Testing Performance To test time measurement accuracy To test time measurement accuracy This test uses a precise frequency source to check the accuracy of time measurement functions. Specification Delta-t accuracy Equivalent Time: (≥16 averages) ±[(0.007% × delta-t) + (full scale/(2 × memory depth))+ 30 ps] Real Time: * ±[(0.007% ×...
Page 55 Chapter 3: Testing Performance To test time measurement accuracy Select horizontal from the setup mean. Set the scale to 5 ns/div, position at –5 ns, and reference to the left. Figure 3-8 Horizontal Setup for Equivalent Time Procedure Adjust the signal generator output voltage to obtain a waveform with a risetime of approximately 700 ps to 1.4 ns.
Page 56 Chapter 3: Testing Performance To test time measurement accuracy Select Equivalent Time sampling mode. Enable Averaging and set the # Points to be averaged to 16. Select Manual Memory Depth. Set the memory depth to 2004 points. Click Close. See figure 3-10. Figure 3-10 Acquisition Setup for Equivalent Time Procedure Select Delta Time from the Time submenu of the Measure menu.
Page 57 Chapter 3: Testing Performance To test time measurement accuracy Figure 3-12 Measurement Settings for Time Interval Measurement For valid statistical data In equivalent time mode, measurement specifications are valid with sixteen or more acquisitions averaged. Statistics accumulated before the required number of averaged acquisitions may show the instrument to fail the specification.
Page 58 Chapter 3: Testing Performance To test time measurement accuracy Clear measurement statistics as in step 18 and restart the measurement. The delta time reading should be 1 µs ± 2.595 ns, minimum 997.4 ns and maximum 1.0026 µs. Record the minimum and maximum readings in the Performance Test Record.
Page 59: Real-Time Mode Procedure
Select Real Time sampling mode. Set Configuration to 8 GSa/s (Agilent 54846B and 54845B). Set Sampling Rate to Manual, 8 GSa/s (Agilent 54845B and 54846B). Enable Averaging with the number of points set to 16. Set Memory Depth to Automatic. Click Close.
Page 60 Select Period from the Time submenu of the Measure menu. Period should be the following. For Agilent 54845B and 54846B: 39.50 ns ± 28 ps, minimum 39.47 ns, maximum 39.53 ns. Record the minimum and maximum readings in the Performance Test Record.
Page 61: To Test Trigger Sensitivity
Chapter 3: Testing Performance To test trigger sensitivity To test trigger sensitivity This test checks channel and external triggers for sensitivity at rated bandwidth. Specification Internal: dc to 500 MHz: 0.5 div 100 MHz to 500 MHz: 1.0 div 500 MHz to 1 GHz: 1.5 div Auxiliary: dc to 500 MHz: 300 mV Equipment Required...
Page 62 Chapter 3: Testing Performance To test trigger sensitivity Turn on Channel 1 and turn off all other channels. You can do this by using the channel keys above each input BNC or by using the check boxes at the top of the waveform display area. Set vertical scale for channel 1 to 200 mV/div.
Page 63: Procedure-Auxiliary Trigger Test
Chapter 3: Testing Performance To test trigger sensitivity Adjust the horizontal sweep speed to 1 ns/div. Adjust the trigger level for a stable display. The test passes if triggering is stable. Record the result in the Performance Test Record. Connect the signal generator to the channel 2 input. Repeat steps 4 through 20 for the remaining channels.
Page 64 Performance Test Record Agilent Technologies Agilent Technologies 54845B/46B Oscilloscope Model Number _____________________ Tested by___________________ Serial Number ___________________________ Work Order No.___________________ Recommended Test Interval - 1 Year/2000 hours Date___________________ Recommended next testing___________________ Ambient temperature ___________________ Test Limits Results (Vmax - Vmin)/5 =...
Page 65 __________________ __________________ Time Period Limits Minimum Maximum measurement accuracy— Agilent 54845B/46B: 39.50 ns ± 28 ps 39.47 to 39.53 ns __________________ __________________ real time ∆Time (edge#11) Limits mode Agilent 54845B/46B: 395 ns ± 53 ps 394.947 to 395.053 ns __________________ __________________ ∆Time (edge#101)
Page 66 3–28...
Page 67: Calibrating And Adjusting
Equipment Required 4-2 Self Calibration Interval and Hardware Adjustments 4-2 Mainframe Cal Factor Memory Error 4-2 Operating Hints 4-3 Loading Default Oscilloscope Settings 4-3 Loading New Software 4-3 Calibration Procedures 4-3 To check the power supply 4-4 To check the 715 Hz auxiliary output (probe compensation squarewave) 4-6 To check the flat panel display (FPD) 4-7 To run the self calibration 4-10 Calibrating and Adjusting...
Page 68: Equipment Required
Calibrating and Adjusting This chapter provides firmware (self calibration) and hardware adjustment procedures for the Agilent Technologies 54845B/46B oscilloscope. • Power Supply Check • Oscillator Check • Flat-Panel Display Check • self calibration Equipment Required Equipment required for adjustments is listed in the Recommended Test Equipment table in chapter 1 of this manual.
Page 69: Operating Hints
Chapter 4: Calibrating and Adjusting Operating Hints Some knowledge of operating the Agilent Technologies 54845B/46B oscilloscope is helpful. However, procedures are written so that little experience is necessary. The following hints will speed progress of the procedures. When using many averages, it often takes awhile for a waveform display to stabilize after a change.
Page 70: To Check The Power Supply
Chapter 4: Calibrating and Adjusting To check the power supply To check the power supply There are no adjustments for the supply. Perform this procedure only if you suspect a power supply problem. Equipment Required Equipment Critical Specifications Recommended Model/Part Accuracy ±0.05% Digital Voltmeter Agilent 34401A...
Page 71 Chapter 4: Calibrating and Adjusting To check the power supply Connect the common lead of the voltmeter to the GND test point. Connect the positive lead of the voltmeter to the +5.1 V test point. Verify that the +5.1 supply voltage is within limits as shown in the following table: Table 4-1 Power Supply Voltage Limits Supply Voltage Specification...
Page 72: To Check The 715 Hz Auxiliary Output (Probe Compensation Squarewave)
Chapter 4: Calibrating and Adjusting To check the 715 Hz auxiliary output (probe compensation squarewave) To check the 715 Hz auxiliary output (probe compensation squarewave) This test is optional. The 715 Hz auxiliary output is not specified in the oscilloscope performance specifications.
Page 73: To Check The Flat Panel Display (Fpd)
Chapter 4: Calibrating and Adjusting To check the flat panel display (FPD) To check the flat panel display (FPD) No equipment is required for this procedure. Specifications for flat-panel displays used in the Infiniium oscilloscope are shown in the following table. Flat-Panel Display Specifications Defect Type Limit...
Page 74 Chapter 4: Calibrating and Adjusting To check the flat panel display (FPD) Figure 4-2 Click to start the test Select Screen to do the flat-panel display test Starting the Screen Test Click Start. A new dialog appears with a series of radio buttons that allow selection of different background colors.
Page 75 Chapter 4: Calibrating and Adjusting To check the flat panel display (FPD) Figure 4-3 Click one of these buttons to select the background color to check Screen Test Select a color by clicking the radio button for that color. Carefully check the colored region for pixels colored differently than the current selection.
Page 76: To Run The Self Calibration
Chapter 4: Calibrating and Adjusting To run the self calibration To run the self calibration The self calibration uses signals generated in the oscilloscope to calibrate channel sensitivity, offsets, and trigger parameters. You should run the self calibration • yearly, or according to your periodic needs, •...
Page 77 Chapter 4: Calibrating and Adjusting To run the self calibration Figure 4-4 Clear this check box before starting calibration Click here to start calibration Calibration Dialog Clear Cal Memory Protect to Run self calibration You cannot run self calibration if this box is checked. Click Start, then follow the instructions on the screen.
Page 78 4–12...
Page 79: Troubleshooting
"Safety" on page 5-2 "Tools Required" on page 5-2 "ESD Precautions" on page 5-2 "Keystroke Conventions" on page 5-2 "Default Setup" on page 5-3 "To install the fan safety shield" on page 5-3 "To troubleshoot the instrument" on page 5-4 "Primary Trouble Isolation"...
Page 80: Safety
Use caution when working around the cooling fan with the cover removed from the instrument. The cooling fan blades are exposed on one side and can be hazardous. Install the optional fan safety shield (Agilent Technologies P/N 54801-00601) to protect your fingers from the fan blades. Tools Required You will need basic electronic troubleshooting tools, including a digital multimeter and a 100-MHz oscilloscope.
Page 81: Default Setup
Chapter 5: Troubleshooting To install the fan safety shield Default Setup A Default Setup is provided to assure the instrument setup is in a known default state. The default setup prevents previous setups from interfering with the next test. It also simplifies the instrument setup procedure.
Page 82: To Troubleshoot The Instrument
Chapter 5: Troubleshooting To troubleshoot the instrument To troubleshoot the instrument The troubleshooting procedure is used to isolate problems to a faulty assembly. When you find the faulty assembly, use the disassembly and assembly procedures in chapter 6 to replace the assembly.
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Page 84: Primary Trouble Isolation
Chapter 5: Troubleshooting Primary Trouble Isolation Primary Trouble Isolation The actions in the Primary Trouble Isolation are done without disassembling the instrument. Interaction of the front panel with the rest of the instrument and other indicators are used to help identify the problem area. A letter is assigned to boxes in the flowchart.
Page 85 Chapter 5: Troubleshooting Primary Trouble Isolation Run oscilloscope self-tests. 1 Enable the graphical interface. Refer to section 2 “Preparing for use” for instructions. 2 Select Self Test from the Utilities menu. 3 Select Scope Self Tests from the Self Test drop down list box. 4 Click the Start Test button and follow the instructions on the screen.
Page 86 Chapter 5: Troubleshooting Primary Trouble Isolation Use the following procedure to test the front-panel LED (light-emitting diode) indicators. 1 Enable the graphical interface. 2 Select Self Test from the Utilities menu. 3 Select LED from the Self Test drop-down list box, then click Start Test. The LED test screen appears, which shows a symbolic representation of all front panel LED indicators.
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Page 88: No Display Trouble Isolation
1 Disconnect the power cord from the oscilloscope. Refer to chapter 6, “Replacing Assemblies,” for instructions on removing the cabinet. Use care in handling the instrument. 2 Install the optional fan safety shield, Agilent Technologies P/N 54810-00601, over the fans on the left side of the instrument. WAR N IN G...
Page 89 Chapter 5: Troubleshooting No Display Trouble Isolation Power Supply Trouble Isolation Check Power Supply Voltages Check power supply Voltages OK? resistances Check for display Replace shorted Resistance OK? onscreen assembly Display Override the Remote onscreen? Inhibit Signal Power supply and Power supply OK, display OK, return to return to no-display...
Page 90: Power Supply Trouble Isolation
You can probe the test points on A13, shown in figure 5-3, for this resistance check. Table 5-3 shows the characteristic resistance values for the Agilent Technologies 54845B/46B oscilloscope. Table 5-2 Approximate Resistance Values, Each Power Supply to Ground...
Page 91 Override the Remote Inhibit signal. Power up the unit by connecting a resistor between pin 3 and pin 11 of power supply control cable W2. Use a resistor in the range of 196-220Ω, 1/8 W, such as Agilent Technologies P/N 0698-3440 or 0757-0407.
Page 92 Chapter 5: Troubleshooting Power Supply Trouble Isolation Check +15 V Bias and Remote Inhibit cabling. If the oscilloscope will not power up, check all cabling to troubleshoot and correct the problem. Figure 5-4 shows the routing of the +15 V Bias and Remote Inhibit signals from the front panel to the power supply.
Page 93: To Check Probe Power Outputs
Chapter 5: Troubleshooting To check probe power outputs To check probe power outputs Probe power outputs are on the front panel, surrounding each BNC input. Use the table and figure to the right Supply to check the power output at the connectors.
Page 94: To Check The Keyboard; Troubleshooting Procedure
Chapter 5: Troubleshooting To Check the keyboard; Troubleshooting Procedure To Check the keyboard; Troubleshooting Procedure Use this procedure only if you encounter key failures in the keyboard test procedure. If any knobs fail, replace the keyboard assembly. Disconnect the power cord and remove the cover. Remove the front panel assembly.
Page 95: To Check The Leds
Chapter 5: Troubleshooting To check the LEDs To check the LEDs If you see a failure with the Auto or Trig’d LEDs, check the voltage at pin 6 of W16, with W16 disconnected from the keyboard. The voltage should be as follows: •...
Page 96: To Check The Motherboard, Cpu, And Ram
Chapter 5: Troubleshooting To check the motherboard, CPU, and RAM To check the motherboard, CPU, and RAM This procedure verifies that the PC system board and the associated CPU and RAM are functioning. It assumes that the power supply, SVGA display board, and an external VGA monitor are functioning correctly.
Page 97: To Check The Svga Display Board Video Signals
The video signals are checked on the 40-pin connector J103 on the SVGA display board A5. Use a 100-MHz, general-purpose oscilloscope, such as the Agilent Technologies 54600B, to verify the signals. Even-numbered pins are on the top side of the connector. The video signals are present during the system boot process before the backlights come on.
Page 98: To Check The Backlight Inverter Voltages
Chapter 5: Troubleshooting To check the backlight inverter voltages To check the backlight inverter voltages The backlight inverter board A3 is located in the front-left corner of the oscilloscope (as you face the front panel). • There is one input connector on the side of the board. •...
Page 99: Post Code Listing
Chapter 5: Troubleshooting POST Code Listing POST Code Listing Use the following listing to troubleshoot the motherboard. You will need a POST (Power-On Self Test) card installed in an PCI slot to use this listing. POST Code Listing Checkpoint Code Description Test CMOS read/write functionality Early Chipset Initialization.
Page 100 Chapter 5: Troubleshooting POST Code Listing Test 8259 interrupt mask bits for channel 1. Test 8259 interrupt mask bits for channel 2. Test 8259 functionality. Initialize EISA slot. Calculate total memory by testing the last double word of each 64K page. Program MTRR of M1 CPU.
Page 101: To Configure The Motherboard Jumpers And Setup Bios
The motherboard jumper information and BIOS setups procedures are presented in the following pages. Agilent Technologies Service Note Describes Upgrade Details For improved performance and hard disk drive reliability, refer to Agilent Service Note 54810-06. This service note gives detailed information for upgrading to 64 MB RAM, upgrading to revision 2.51 or newer code, and enabling power managementin the BIOS.
Page 102 Chapter 5: Troubleshooting To Configure the motherboard jumpers and setup BIOS Configure the MOT VP-22 motherboard for the 866 MHz CPU, CDROM, and 120 Mbyte floppy drive. There is only one jumper to configure on the MOT VP-22 motherboard. It is JP1 and is located at the bottom of the board by the fourth PCI slot.
Page 103 Chapter 5: Troubleshooting To Configure the motherboard jumpers and setup BIOS Go to the standard CMOS features and verify or change these settings: a Set Data and Time b Primary Master Type Auto c Primary Master Mode Auto d Primary Slave Auto e Secondary Master Auto...
Page 104: To Troubleshoot The Acquisition System
If you later exchange the acquisition assembly, Agilent Technologies uses this information to determine when to replace the attenuators to insure quality of future exchange assemblies.
Page 105 Chapter 5: Troubleshooting To troubleshoot the acquisition system Acquisition Trouble Isolation (1 of 4) 5–27...
Page 106 Chapter 5: Troubleshooting To troubleshoot the acquisition system Acquisition Trouble Isolation (2 of 4) 5–28...
Page 107 Chapter 5: Troubleshooting To troubleshoot the acquisition system Acquisition Trouble Isolation (3 of 4) 5–29...
Page 108 Chapter 5: Troubleshooting To troubleshoot the acquisition system Acquisition Trouble Isolation (4 of 4) A to D Converter Failed Failure of this test may involve failure in the Gain test. If the Gain test also fails, first attempt to correct the cause of the Gain test failure by running the Extended Service test for Gain. If any of the channels pass the extended service gain test, you can either use an attenuator from a known good channel to verify the problem in a failing channel, or simply replace the attenuator in a failing channel with a new one.
Page 109 Before you replace the acquisition assembly with a factory rebuilt exchange assembly, record the contact closure information for each channel onto the labels attached to each attenuator. Agilent Technologies uses this to determine when to replace the attenuators to insure quality of future exchange assemblies.
Page 110 Replace the acquisition assembly when this test fails. Before you replace the acquisition assembly with a factory rebuilt exchange assembly, record the contact closure information for each channel onto the labels attached to each attenuator. Agilent Technologies uses this to determine when to replace the attenuators to insure quality of future exchange assemblies.
Page 111: To Troubleshoot Attenuator Failures
Chapter 5: Troubleshooting To troubleshoot attenuator failures To troubleshoot attenuator failures The best method for troubleshooting attenuator assembly failures is to swap the suspected one with a known good one. This discussion will help you determine whether the attenuator or acquisition board is causing a problem.
Page 112: Swapping Attenuators
Chapter 5: Troubleshooting To troubleshoot attenuator failures Swapping Attenuators Attenuator swapping is the best method of finding a faulty attenuator. All input channels of the Infiniium oscilloscope use identical attenuator assemblies. The attenuators for channels 1/2 and 3/4 have been manufactured into assemblies to enhance sampling performance. This troubleshooting method provides fast trouble isolation because it is unlikely that multiple channels will experience the same attenuator failure.
Page 113 Chapter 5: Troubleshooting To troubleshoot attenuator failures Attenuator Assembly Troubleshooting Set attenuator Replace faulty contact counter to attenuator assembly zero for channels and put good where attenuator assembly back in assembly replaced original channel. Perform Connectivity Test on all channels Swap failing channel attenuator assembly Perform Connectivity...
Page 114: Software Revisions
Chapter 5: Troubleshooting Software Revisions Software Revisions • Select About Infiniium... from the Help Menu. Enable the Graphical Interface The graphical interface must be enabled to select this command. A dialog box appears showing the current version number for the scope software and on-line information system software.
Page 115: Replacing Assemblies
ESD Precautions 6-2 Tools Required 6-2 To return the instrument to Agilent Technologies for service 6-3 To remove and replace the cover 6-4 To disconnect and connect Mylar flex cables 6-5 To remove and replace the AutoProbe assembly 6-6 To remove and replace the probe power and control assembly 6-8...
Page 116: Esd Precautions
Replacing Assemblies Use the procedures in this chapter when removing and replacing assemblies and parts in the Agilent Technologies 54835B/45B oscilloscope. In general, the procedures that follow are placed in the order to be used to remove a particular assembly. The procedures listed first are for assemblies that must be removed first.
Page 117: To Return The Instrument To Agilent Technologies For Service
Pack the instrument in foam or other shock absorbing material and place it in a strong shipping container. You can use the original shipping materials or order materials from an Agilent Technologies Sales Office. If neither are available, place 8 to 10 cm (3 to 4 inches) of shock-absorbing material around the instrument and place it in a box that does not allow movement during shipping.
Page 118: To Remove And Replace The Cover
Chapter 6: Replacing Assemblies To remove and replace the cover To remove and replace the cover Use these steps to remove and replace the cover. When necessary, refer to other removal procedures. Disconnect the power cable. Disconnect all scope probes and BNC input cables from the front panel. Disconnect any other cables, such as mouse, keyboard, printer, or GPIB cables.
Page 119: To Disconnect And Connect Mylar Flex Cables
Chapter 6: Replacing Assemblies To disconnect and connect Mylar flex cables To disconnect and connect Mylar flex cables Use this procedure when you are instructed to disconnect or connect a Mylar flex cable. Such cables and their connectors are fragile; mishandling may damage the cable or connector. To disconnect the cable Pry up the retainer slightly at either end of the connector using a small flat-blade screwdriver.
Page 120: To Remove And Replace The Autoprobe Assembly
Chapter 6: Replacing Assemblies To remove and replace the AutoProbe assembly To remove and replace the AutoProbe assembly Use this procedure to remove and replace the AutoProbe assembly. When necessary, refer to other removal procedures. Figure 6-4 AutoProbe Assembly Disconnect the power cable and remove the cover. Remove the AutoProbe connector assembly, the subpanel, and the probe connector assembly that fits around the front-panel BNC connectors, by doing the following: a Disconnect the mylar ribbon cable W8 from the Probe Power and Control Board, A15.
Page 121 Chapter 6: Replacing Assemblies To remove and replace the AutoProbe assembly b Locate the access hole in the front-panel assembly below and almost between channel two and channel three attenuators. c From the back of the front panel, use a small screw driver or other slender pointed object through the access hole to push the AutoProbe assembly faceplate away from the front panel assembly.
Page 122: To Remove And Replace The Probe Power And Control Assembly
Chapter 6: Replacing Assemblies To remove and replace the probe power and control assembly To remove and replace the probe power and control assembly Use this procedure to remove the probe power and control assembly. When necessary, refer to other removal procedures. Figure 6-8 Probe Power and Control Assembly Disconnect the power cable and remove the cover.
Page 123 Chapter 6: Replacing Assemblies To remove and replace the probe power and control assembly Lift the probe power and control assembly out and away from the chassis. Figure 6-9 Remove the Probe Power and Control Assembly To replace the probe power and control assembly, reverse the above procedure. When inserting the assembly, be sure the two tabs on the circuit board engage the two slots in the sheet metal.
Page 124: To Remove And Replace The Backlight Inverter Board
Chapter 6: Replacing Assemblies To remove and replace the backlight inverter board To remove and replace the backlight inverter board Use this procedure to remove and replace the backlight inverter board. When necessary, refer to other removal procedures. Figure 6-10 Backlight Inverter Board WAR N IN G SHOCK HAZARD!
Page 125: To Remove And Replace The Front Panel Assembly
Chapter 6: Replacing Assemblies To remove and replace the front panel assembly Lift the backlight inverter board out through the top of the chassis. To replace the backlight inverter board, reverse the assembly procedure. Figure 6-11 Removing the Backlight Inverter Board To remove and replace the front panel assembly Use these steps to remove and replace the front panel assembly.
Page 126 Chapter 6: Replacing Assemblies To remove and replace the front panel assembly Disconnect the Aux Out SMB cable W9 from J10 and the black Comp wire W10 from J4. Push them to the side. If necessary, use pliars to remove the Comp wire. These cables are located behind the Aux Trigger Input BNC connector on the Acquisition board.
Page 127 Chapter 6: Replacing Assemblies To remove and replace the front panel assembly Remove the four Torx T15 screws that secure the chassis sides to the front panel assembly. Figure 6-15 Front Panel Side Screws Remove the two Torx T10 screws that secure the chassis front to the front panel assembly.
Page 128: To Remove And Replace The Keyboard And Flat-Panel Display Assemblies
Chapter 6: Replacing Assemblies To remove and replace the keyboard and flat-panel display assemblies To remove and replace the keyboard and flat-panel display assemblies Use these steps to disassemble and re-assemble the front panel assembly, including the keyboard and flat-panel display. Where necessary, refer to other removal procedures. Disconnect the power cable and remove the cover.
Page 129 Chapter 6: Replacing Assemblies To remove and replace the keyboard and flat-panel display assemblies To remove the cursor keyboard and flat lens, remove the four Torx T10 screws that secure the lens corners, then carefully remove the lens. You can lift the cursor keyboard directly out of the front casting.
Page 130 Chapter 6: Replacing Assemblies To remove and replace the keyboard and flat-panel display assemblies To re-assemble the front panel assembly, reverse the above procedure. The cursor keyboard has holes that fit over locating pins in the front panel casting. CA UT IO N PREVENT GLASS BREAKAGE! Use care when handling the Lens Glass and the FPD monitor to prevent glass breakage.
Page 131: To Remove And Replace The Acquisition Board Assembly
Chapter 6: Replacing Assemblies To remove and replace the acquisition board assembly To remove and replace the acquisition board assembly Use this procedure to remove and replace the acquisition assembly. When necessary, refer to other removal procedures. Disconnect the power cable and remove the cover. Remove the Probe Assembly subpanel assembly.
Page 132: To Remove And Replace The Gpib Interface Board
Chapter 6: Replacing Assemblies To remove and replace the GPIB interface board To remove and replace the GPIB interface board Use this procedure to remove and replace the GPIB interface board. When necessary, refer to other removal procedures. Disconnect the power cable and remove the cover. Remove the Torx T15 screw that secures the GPIB board to the rear of the chassis.
Page 133: To Remove And Replace The Scope Interface Board And Svga Display Board
Chapter 6: Replacing Assemblies To remove and replace the scope interface board and SVGA display board To remove and replace the scope interface board and SVGA display board Use these steps to remove and replace the scope interface board and SVGA display boards. These boards must be removed and replaced as a unit.
Page 134: To Remove And Replace The Ls120 Floppy Disk Drive
Chapter 6: Replacing Assemblies To remove and replace the LS120 floppy disk drive To remove and replace the LS120 floppy disk drive Use this procedure to remove and replace the floppy disk drive. When necessary, refer to other removal procedures. Disconnect the power cable and remove the top sleeve.
Page 135: To Remove And Replace The Hard Disk Drive
Chapter 6: Replacing Assemblies To remove and replace the hard disk drive To remove and replace the hard disk drive Disconnect the power cable and remove the top sleeve. Using a T10 driver remove the adapter board from the LS120 drive. Remove the hard drive IDE cable.
Page 136 Chapter 6: Replacing Assemblies To remove and replace the hard disk drive Using a T20 driver remove the two screws holding the shock mount in place. Tilt the disk drive assembly forward and lift up to remove. Using a T10 remove the four screws holding the disk drive onto the shock mount. Figure 6-24 Removing the Hard Disk Drive To replace the hard disk reverse, the above procedure with a new hard drive.
Page 137: To Remove And Replace The Cd-Rom Drive
Chapter 6: Replacing Assemblies To remove and replace the CD-ROM drive To remove and replace the CD-ROM drive Use this procedure to remove and replace the CD-ROM drive. When necessary, refer to other removal procedures. Disconnect the power cable and remove the top sleeve. Remove the following cables: •...
Page 138: To Remove And Replace The Motherboard
Chapter 6: Replacing Assemblies To remove and replace the motherboard To remove and replace the motherboard Use the following procedure to remove and replace the motherboard assembly. When necessary, refer to other removal procedures. CA UT IO N REPLACE MOTHERBOARD WITH THE SAME TYPE! Be sure to order the correct motherboard, and replace the motherboard with the same type.
Page 139 Chapter 6: Replacing Assemblies To remove and replace the motherboard Disconnect the following cables. • IDE cables (2) from Motherboard to LS120 disk drive and CD-ROM drive adapter board W15 • Motherboard power supply cable W4 • Display ribbon cable W11 •...
Page 140 Chapter 6: Replacing Assemblies To remove and replace the motherboard Remove the remaining T10 screws from the motherboard. Lift the motherboard out of the tray. To replace the motherboard assembly, reverse the above procedure. Note the following: • Replacement motherboards come with a CPU and RAM DIMMs. Be sure to observe polarity when reconnecting all the cables.
Page 141: To Remove And Replace The Power Supply
Chapter 6: Replacing Assemblies To remove and replace the power supply To remove and replace the power supply Use these steps to remove the power supply assembly. When necessary, refer to other removal procedures. WAR N IN G SHOCK HAZARD! If the power supply is defective is could have a dangerous charge on some capacitors.
Page 142 Chapter 6: Replacing Assemblies To remove and replace the power supply Remove the Torx T15 screw that secures the power supply support bracket to the power supply. Figure 6-30 Removing Motherboard Subassembly Torx Screws and Power Supply Cables Remove the two Torx T10 screws that secure the support bracket to the chassis. Remove the four Torx T15 screws that secure the hard drive to the mounting bracket.
Page 143: To Remove And Replace The Fan Controller Board
Chapter 6: Replacing Assemblies To remove and replace the fan controller board To remove and replace the fan controller board Disconnect the power cable and remove the cover. Disconnect the following cables from the fan control board. • All six fan power cables from the fan control board •...
Page 144: To Remove And Replace The Fan
Disconnect the fan cable from the fan control board. Remove the fan bracket securing the fan to the chassis. The ATX Service Kit (Agilent Technologies P/N 54845-68803) has instructions and a tool to assist with fan bracket removal. Figure 6-31...
Page 145: To Remove And Replace An Attenuator
Chapter 6: Replacing Assemblies To remove and replace an attenuator To remove and replace an attenuator Use this procedure to remove and replace an attenuator assembly. When necessary, refer to other removal procedures. CA UT IO N ELECTROSTATIC DISCHARGE! Use grounded wrist straps and mats when servicing the acquisition board. Electrostatic discharge can damage electronic components.
Page 146 Chapter 6: Replacing Assemblies To remove and replace an attenuator Figure 6-32 Removing an Attenuator If You Permanently Replace Parts When you replace acquisition system components, you should rerun the self calibration routines prior to performance verification or use of the instrument. 6–32...
Page 147: To Reset The Attenuator Contact Counter
Chapter 6: Replacing Assemblies To reset the attenuator contact counter To reset the attenuator contact counter Turn off the Infiniium oscilloscope. Connect a mouse and a keyboard to the oscilloscope. Turn on the oscilloscope. Insert the service disk when the message “Starting Windows 9x...”...
Page 148 Chapter 6: Replacing Assemblies To reset the attenuator contact counter Click the Start Test button. A screen like the following will be displayed. Figure 6-34 Attenuator Relay Actuations Setup In the Attenuator Channel box, select the channel you are changing. Under Set Value, enter the corrected attenuator value using the keyboard or the drop down keypad, then press the button labeled Apply ‘Set Value’...
Page 149: To Remove And Replace An Acquisition Hybrid
Chapter 6: Replacing Assemblies To remove and replace an acquisition hybrid To remove and replace an acquisition hybrid Use the following procedure to remove and replace an acquisition hybrid. When necessary, refer to other removal procedures. CA UT IO N ELECTROSTATIC DISCHARGE! Use grounded wrist straps and mats when servicing the acquisition board.
Page 150: To Replace The Acquisition Hybrid
Chapter 6: Replacing Assemblies To remove and replace an acquisition hybrid To replace the acquisition hybrid The location of pins and other locator features will guide the alignment of parts. This assembly cannot be assembled incorrectly without forcing. Install the hybrid with the three corner holes over the three large locator pins. Install the top plate with the three cut-out corners over the three locator pins.
Page 151 Chapter 6: Replacing Assemblies To remove and replace an acquisition hybrid The Hybrid Connector As shown in the illustration, two screws through the hybrid connector hold the bottom plate to the underside of the PC board. If you remove the connector, the bottom plate can fall away from the board.
Page 152 Chapter 6: Replacing Assemblies To remove and replace an acquisition hybrid 6–38...
Page 153: Replaceable Parts
Ordering Replaceable Parts 7-2 Listed Parts 7-2 Unlisted Parts 7-2 Direct Mail Order System 7-2 Exchange Assemblies 7-2 Power Cables and Plug Configurations 7-3 Exploded Views 7-5 Replaceable Parts List 7-10 Replaceable Parts...
Page 154: Ordering Replaceable Parts
Ordering Replaceable Parts Listed Parts To order a part in the parts list, quote the Agilent Technologies part number, indicate the quantity desired, and address the order to the nearest Agilent Technologies Sales Office. Unlisted Parts To order a part not listed in the parts list, include the instrument part number, instrument serial number, a description of the part (including its function), and the number of parts required.
Page 155: Power Cables And Plug Configurations
Chapter 7: Replaceable Parts Power Cables and Plug Configurations Power Cables and Plug Configurations This instrument is equipped with a three-wire power cable. The type of power cable plug shipped with the instrument depends on the country of destination. The following figure shows option numbers of available power cables and plug configurations.
Page 156 Thailand * Part number shown for plug is industry identifier for plug only. Number shown for cable is Agilent Technologies part number for complete cable including plug. ** These cords are included in the CSA certification approval of the equipment.
Page 157: Exploded Views
Chapter 7: Replaceable Parts Exploded Views Exploded Views Front Frame and Front Panel 7–5...
Page 158 Chapter 7: Replaceable Parts Exploded Views Fan and Acquisition Assembly 7–6...
Page 159 Chapter 7: Replaceable Parts Exploded Views Power Supply and PC Motherboard 7–7...
Page 160 Chapter 7: Replaceable Parts Exploded Views Sleeve and Accessory Pouch 7–8...
Page 161 Chapter 7: Replaceable Parts Exploded Views Attenuator Assembly 7–9...
Page 162: Replaceable Parts List
The information given for each part consists of the following: • Reference designation. • Agilent Technologies part number. • Total quantity (QTY) in instrument or on assembly. The total quantity is given once and at the first appearance of the part number in the list.
Page 163 Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description Exchange Assemblies 54845-69527 4-CH ACQUISITION ASSEMBLY W/ATTENUATORS (Agilent Model 54845B) 54846-69527 4-CH ACQUISITION ASSEMBLY W/ATTENUATORS (Agilent Model 54846B) External Chassis Parts MP13 54801-47403 KNOB 24 MM GRAY MP14 54801-47408...
Page 164 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description 54810-66531 LS120 ADAPTER BOARD 86100-66517 CDROM ADAPTER BOARD 0950-4192 CD ROM Drive 0950-3931 LS120 SUPERDISK 0950-3933 HARD DRIVE 54810-83523 HARD DRIVE w/SOFTWARE 0960-2176 MOTHERBOARD SUBASSEMBLY 0624-0847 SELF TAPING SCREWS 54801-61643...
Page 165 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description 54801-24702 RETAINER STRAP HANDLE 0515-2195 PAN HANDLE SCREW 40 MM 0515-1103 FLAT HEAD SCREW 0515-0380 PAN HEAD SCREW 0515-1403 M4X0.7 6 MM 90DEG FLATHD T15 0515-0456 MS M4X0.7 20 MM LG SCREW 0515-0375...
Page 166 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description 54810-61612 KEYBOARD CABLE 54810-61604 PROBE POWER CABLE 54810-61603 FAN CABLE 54801-61626 KEYBOARD INTERCONNECT 54810-61605 BACKLIGHT POWER CABLE 54801-61624 DISPLAY JUMPER CABLE 7–14...
Page 167: Theory Of Operation
Block-Level Theory 8-3 Power Supply Assembly 8-3 FPD Monitor Assembly 8-3 Acquisition System 8-4 Front Panel 8-4 Disk Drives 8-4 Attenuators 8-4 Motherboard 8-4 SVGA Display Card 8-5 GPIB Interface Card 8-5 Probe Power and Control 8-5 Attenuator Theory 8-7 Acquisition Theory 8-7 Acquisition Board 8-7 Acquisition Modes 8-9...
Page 168 Chapter 8: Theory of Operation Instrument Block Diagram Shown for Original Configuration w/1.44 MByte Floppy Drive 8–2...
Page 169: Block-Level Theory
4 GSa/s. Each channel is stored into 32 Kbytes of memory. Pairs of channels can be combined to sample at 8 GSa/s and extend memory to 64 Kbytes. The Agilent Technologies 54846B Oscilloscope has the same features as the 54845B with a higher bandwidth of 2.25 GHz.
Page 170: Acquisition System
Chapter 8: Theory of Operation Block-Level Theory Acquisition System The acquisition system includes two attenuator assemblies, acquisition board, and scope interface board. The attenuators condition the signal, which is then digitized and stored by the acquisition board. The scope interface board provides the system control interface from the motherboard, and also interfaces the acquisition board to the SVGA display board for display of the acquired data.
Page 171: Svga Display Card
Chapter 8: Theory of Operation Block-Level Theory SVGA Display Card The SVGA Display Card controls the flat-panel display monitor. There are two major video paths on this board. The first is used by the system controller on the motherboard to draw all general display elements, including the grid, status indicators, and toolbars and menus for the graphical interface.
Page 172 Chapter 8: Theory of Operation Block-Level Theory TIME BASE CHANNEL 1,2 TRIGGER Acquisition Block Diagram 8–6...
Page 173: Attenuator Theory
A reference oscillator and the time base provide the base sample rates. ADC Hybrid The Agilent Technologies 54845B ADC hybrid provides all of the sampling, digitizing, and high-speed waveform storage. Each ADC hybrid contains two 2 GSa/s ADCs.
Page 174 Chapter 8: Theory of Operation Acquisition Theory Trigger There are four main trigger circuits: Trigger Conditioning, Analog Comparators, a Trigger Multiplexer, and Logic Trigger. Trigger signals from the channel are fed to the analog trigger comparators and the trigger conditioning circuit. The trigger conditioning circuitry selects dc, ac, low-frequency reject, high-frequency reject, and noise reject (hysteresis) modes and sets the trigger levels.
Page 175: Acquisition Modes
1 inputs are routed to both the channel 1 and channel 2 ADC hybrids. The hybrids are time-aligned to sample 90° out-of-phase to yield a sample rate of 8 GSa/s. Channel 3 and channel 4 are combined in the same way (for Agilent Technologies 54845B/ 46B).
Page 176 8–10...
Page 177 Agilent Technologies shall not be • Whenever it is likely that the result in damage to or destruction liable for errors contained herein ground protection is impaired, you of part or all of the product.
Page 178 Infiniium Oscilloscopes Service material and workmanship for a remedies. Agilent Technologies Guide for Agilent Model 54845B/ period of three years from date of shall not be liable for any direct, 46B Oscilloscopes. shipment. During the warranty...

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Agilent Technologies 54845B Manual

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Preparing for Use

Testing Performance

Figure/Figure

Calibrating and Adjusting

Troubleshooting

Replacing Assemblies

Theory of Operation

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Troubleshooting

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