Page 1 800-404-ATEC (2832) Service Guide Publication Number 54855-97008 October 2003 For Safety information, Warranties, and Regulatory information, see the pages at the back of this book.  Copyright Agilent Technologies 2003 All Rights Reserved. Agilent Model 54853A, 54854A, and 54855A Infiniium Oscilloscopes...
Page 2 The Agilent Technologies Infiniium Oscilloscope Model 54853/4/5A 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 Front panel Display and Acquisition and Graphical Horizontal general controls Interface controls Floppy Disk Drive H Vertical Trigger Marker and Quick Auxiliary Inputs Power Setup Measurements Trigger Input Vertical Controls AutoProbe Interface Rear panel without option 017 GPIB Interface AC Power CD-RW Parallel Rear...
Page 4 Rear panel with option 017 Removable hard drive...
Page 5: In This Book
In This Book This book provides the service documentation for the Agilent Technologies 54853A, 54854A, and 54855A oscilloscopes. It is divided into seven chapters. Chapter 1 provides general information and specifications. Chapter 2 shows you how to prepare the oscilloscope for use.
Page 7: Table Of Contents
Analog Bandwidth - Maximum Frequency Check 3-16 Horizontal Performance Verification 3-23 Time Base Accuracy Test 3-24 Delta-time Measurement Accuracy Test 3-28 Trigger Performance Verification 3-31 Internal Channel Trigger Sensitivity Test 3-32 Trigger Jitter Test 3-43 Agilent 54853A/54A/55A Performance Test Record 3-47 Contents–1...
Page 8 Replacing Assemblies ESD Precautions 6-2 Tools Required 6-2 To return the oscilloscope to Agilent Technologies for service 6-3 To remove and replace the covers 6-4 To disconnect and connect Mylar flex cables 6-6 To remove and replace the AutoProbe assembly 6-7...
Page 9 Contents To remove and replace the power regulator distribution board 6-22 To remove and replace the GPIB interface board 6-23 To remove and replace the PCI bridge board. 6-24 To remove and replace the scope interface board and SVGA display board 6-25 To remove and replace the floppy disk drive 6-26 To remove and replace the internal hard disk drive 6-27 To remove and replace the CD-ROM drive 6-29...
Page 10 Contents-4...
Page 11: General Information
Instruments covered by this service guide 1-2 Accessories supplied 1-3 Options available 1-3 Accessories available 1-3 Specifications and Characteristics 1-5 Recommended test equipment 1-12 General Information...
Page 12: Instruments Covered By This Service Guide
• Test equipment requirements Instruments covered by this service guide The oscilloscope can be identified by the product number (54853A, 54854A, or 54855A) on the back panel. On the rear panel of the instrument is a serial number label and a VIN # XXX. The serial number is composed of two parts.
Page 13: Accessories Supplied
Chapter 1: General Information Accessories supplied Accessories supplied The following accessories are supplied. • Mouse, Agilent part number 1150-7913 • Keyboard, Agilent part number 1150-7809 • Accessory Pouch, Agilent part number 54810-68701 • Front-panel cover, Agilent part number 54810-42201 • Calibration cable assembly (54855A only), Agilent part number 54855-61620 •...
Page 14 Chapter 1: General Information Accessories available Agilent Model Number Description 1132A 5 GHz InfiniiMax Active Probe 1134A 7 GHz InfiniiMax Active Probe 1144A 800 MHz Active Probe 1145A 750 MHz Active Probe 1156A 1.5 GHz Active Probe 1157A 2.5 GHz Active Probe 1158A 4 GHz Active Probe 1181B...
Page 15: Specifications And Characteristics
Specifications and Characteristics Specifications and Characteristics The following table lists the specifications and characteristics for the Agilent Technologies 54853A, 54854A, and 54855A Infiniium Oscilloscopes. Asterisks (*) denotes warranted specifications, all others are typical. Specifications are valid after a 30 minute warm-up period, ±...
Page 16 54855A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 4 GHz, <2.5 div @ 5 GHz 54854A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 4 GHz 54853A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 2.5 GHz Internal High 54855A: 0.2 div p-p 0 to 6 GHz...
Page 17 Chapter 1: General Information Specifications and Characteristics Trigger modes Edge Triggers on a specified slope and voltage level on any channel or auxiliary trigger. Glitch Triggers on glitches narrower than the other pulses in your waveform by specifying a width less than your narrowest pulse and a polarity. Triggers on glitches as narrow as 500 ps.
Page 18 Chapter 1: General Information Specifications and Characteristics Waveform math Four functions, select from add, average, differentiate, divide, FFT magnitude, FFT phase, integrate, invert, magnify, min, max, multiply, subtract, versus, common mode, smoothing. Frequency range 4 DC to 10 GHz. Frequency resolution Sample rate/memory depth = Resolution.
Page 19 Chapter 1: General Information Specifications and Characteristics I/O ports RJ-45 connector, supports 10Base-T and 100Base-T. Enables Web-enabled remote control, e-mail on trigger or demand, data/file transfers and network printing. GPIB IEEE 488.2, fully programmable. RS-232 (serial) COM1, printer and pointing device support. Parallel Centronics printer port.
Page 20 54854A: (-3 dB at 4 GHz, with amplitude decreasing as frequency increases above 4 GHz). 54853A: (-3 dB at 2.5 GHz, with amplitude decreasing as frequency increases above 2.5 GHz). 5. The noise floor varies with memory depth and averaging.
Page 21: Dimensions
Chapter 1: General Information Dimensions Dimensions The following pictures shows the dimensions of the frame. 1–11...
Page 22: Recommended Test Equipment
Agilent 54855-67604 Shorting Cap BNC (m) Agilent 1250-0929 Ω Cable Assembly characteristic impedance Agilent 8120-1838 (Cal Cable for 54853A BNC (m) connectors or Agilent 10502A and 54854A) <= 12 Inch Length Cable Assembly NO Substitute Agilent 54855-61620 (Cal Cable for 54855A) 10 MHz Signal Source Frequency accuracy better than 0.4 ppm...
Page 23 Chapter 1: General Information Recommended test equipment Alternate Power Splitter/Power Sensor Equipment - List 2 Equipment Required Critical Specifications Recommended Model Power Splitter 2 Resistor Power Splitter Agilent 11667A ≥ Max Frequency 18 GHz ≥ Power Sensor Maximum Frequency 6 GHz Agilent E4412A Power range: -24 dBm to +16 dBm Adapters...
Page 24 1–14...
Page 25 To connect power 2-3 To connect the mouse or other pointing device 2-5 To connect the keyboard 2-6 To connect to the LAN card 2-7 To connect oscilloscope probes 2-8 To connect SMA Cables 2-10 To connect a printer 2-11 To connect an external monitor 2-13 To connect a GPIB cable 2-13 To tilt the oscilloscope upward for easier viewing 2-15...
Page 26: Setting Up The Oscilloscope
Setting Up the Oscilloscope This chapter shows you how to set up your Infiniium oscilloscope, connect power and accessories, and verify general operation. 2–2...
Page 27: To Connect Power
Chapter 2: Setting Up the Oscilloscope To connect power To connect power Position the oscilloscope where it will have sufficient clearance for airflow around the top, bottom, back, and sides. Position the oscilloscope so that it is not difficult to unplug the power cord. Figure 2-1 Minimum 39 mm Minimum 0 mm...
Page 28 VAC. Therefore, you do not need to adjust an input line voltage setting. The line cord provided is matched by Agilent Technologies to the country of origin of the order. A full list of power cables and plug configurations is shown in chapter 6, "Replaceable Parts".
Page 29: To Connect The Mouse Or Other Pointing Device
Chapter 2: Setting Up the Oscilloscope 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. Figure 2-3 Connecting the Mouse Cable While you can operate many oscilloscope functions using 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 Connect The Keyboard
Chapter 2: Setting Up the Oscilloscope To connect the keyboard To connect the keyboard Plug the keyboard cable into the matching connector on the back panel of the oscilloscope. Figure 2-4 Connecting the Keyboard The keyboard simplifies some oscilloscope tasks, such as entering file names when you store waveforms and setups to the disk.
Page 31: To Connect To The Lan Card
Chapter 2: Setting Up the Oscilloscope To connect to the LAN card To connect to the LAN card Connect your LAN cable to the RJ-45 connector on the LAN card. Make sure the connection is secure. Figure 2-5 RJ-45 Connection Connecting to the LAN Card After you have connected to the LAN card, you must set up the network.
Page 32: To Connect Oscilloscope Probes
Chapter 2: Setting Up the Oscilloscope To connect oscilloscope probes To connect oscilloscope probes Attach the probe connector to the desired oscilloscope channel or trigger input. Push it straight on until it latches into place. Figure 2-6 Attaching the Probe Connector Connect the probe to the circuit of interest using the browser or other probing accessories.
Page 33 Chapter 2: Setting Up the Oscilloscope 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 Figure 2-8 Disconnecting the Oscilloscope Probe CA UT IO N...
Page 34: To Connect Sma Cables
You can connect an SMA cable to the Infiniium oscilloscopes by using 3.5 mm to BNC compatible adaptors. Precision adapters are supplied with the 54854A and 54855A. Precision adapters are not required for the 54853A. Attach the two 3.5 mm to BNC compatible adaptors to the ends of an SMA cable.
Page 35: To Connect A Printer
Chapter 2: Setting Up the Oscilloscope 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 C2950A (2 m) or 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 34398A cable, plus the 34399A adapter kit.
Page 36 Chapter 2: Setting Up the Oscilloscope To connect a printer Connect the 9-pin “D” connector of the serial printer cable to the serial output port on the rear panel of the oscilloscope. Tighten the thumbscrews to secure the cable. Figure 2-12 Attaching the 9-pin “D”...
Page 37: To Connect An External Monitor
Chapter 2: Setting Up the Oscilloscope To connect an external monitor To connect an external monitor To display a larger view of the oscilloscope screen You can connect a VGA-compatible monitor to the Infiniium oscilloscope to provide a larger viewing area of the oscilloscope display.
Page 38 Chapter 2: Setting Up the Oscilloscope To connect a GPIB cable Figure 2-15 Attaching the GPIB Connector 2–14...
Page 39: To Tilt The Oscilloscope Upward For Easier Viewing
Chapter 2: Setting Up the Oscilloscope To tilt the oscilloscope upward for easier viewing To tilt the oscilloscope upward for easier viewing Lift up the front of the oscilloscope, grasp the wire bail near the center, and pull it down and forward until it latches into place.
Page 40: To Turn On The Oscilloscope
Chapter 2: Setting Up the Oscilloscope To turn on the oscilloscope To turn on the oscilloscope Depress the power switch in the lower left-hand corner of the oscilloscope front panel. Figure 2-17 Turning on the Oscilloscope After a short initialization period, the oscilloscope display appears. The oscilloscope is ready to use. Hook up all cables and accessories before applying power.
Page 41: To Verify Basic Oscilloscope Operation
Chapter 2: Setting Up the Oscilloscope 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 and make sure you connect the ground wire.
Page 42: Installing Application Programs On Infiniium
Chapter 2: Setting Up the Oscilloscope Installing application programs on Infiniium Installing application programs on Infiniium Infiniium is an open Windows system. This allows you to install your own application software. Agilent has verified that the following applications are compatible with the Infiniium oscilloscope application. •...
Page 43: To Clean The Oscilloscope
Chapter 2: Setting Up the Oscilloscope To clean the oscilloscope To clean the oscilloscope • Clean the oscilloscope with a soft cloth dampened with a mild soap and water solution. CA UT IO N Do not use too much liquid in cleaning the oscilloscope. Water can enter the Infiniium front panel, damaging sensitive electronic components.
Page 44 2–20...
Page 45: Testing Performance
Analog Bandwidth - Maximum Frequency Check 3-16 Horizontal Performance Verification 3-23 Time Base Accuracy Test 3-24 Delta-time Measurement Accuracy Test 3-28 Trigger Performance Verification 3-31 Internal Channel Trigger Sensitivity Test 3-32 Trigger Jitter Test 3-43 Agilent 54853A/54A/55A Performance Test Record 3-47 Testing Performance...
Page 46: Performance Test Interval
Contact Agilent Technologies for more information about the Agilent products in these lists. 3–2...
Page 47: Before Performing Performance Verification Testing
Chapter 3: Testing Performance Before Performing Performance Verification Testing Let the instrument warm up before testing The oscilloscope under test must be warmed up (with the oscilloscope application running) for at least 30 minutes prior to the start of any performance test. Perform self tests While the oscilloscope is warming up, run the self-test to ensure that the hardware is functioning properly.
Page 48: Vertical Performance Verification
Vertical Performance Verification This section contains the following vertical performance verification: • Offset Performance Test • Zero Error Test • Offset Gain Test • DC Measurement Accuracy (Single Cursor) Test • Analog Bandwidth (Maximum Frequency Check) 3–4...
Page 49: Offset Performance Test
Chapter 3: Testing Performance Offset Performance Test Offset Performance Test Specifications Offset Accuracy = ±(2% of channel offset + 1% of full scale) = ±(Offset Gain + Zero Error) Offset Range > ±12 div, or ±4 V, whichever is smallest Full scale is defined as 8 vertical divisions.
Page 50 Chapter 3: Testing Performance Offset Performance Test Configure the scope to measure Average voltage on channel 1 as follows: a Change the vertical sensitivity of channel 1 to 10mV/div. b Click the V avg measurement icon on the left side of the screen. V avg icon c When the Enter Measurement Info window is displayed, ensure that the V avg function...
Page 51 Chapter 3: Testing Performance Offset Performance Test Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of screen) to return to 256 and then record the scope’s mean V avg reading in the Zero Error Test section of the Performance Test Record.
Page 52 Chapter 3: Testing Performance Offset Performance Test Offset Gain Test Make the connections to scope channel 1 as shown below. Connections Digital Multimeter 5485x Scope Under Test BNC Tee connected directly to scope channel input Notes: • Where it is used, it is important to connect the BNC Tee adapter directly to the scope channel input to minimize ground potential differences between the scope and the test instruments and to ensure that the DMM measures the input voltage to the scope channel as accurately as possible.
Page 53 Chapter 3: Testing Performance Offset Performance Test Set the channel 1 offset value to 120 mV. This can be done either using the front panel control or: a Pull down the Setup menu and select Channel 1 or click the Channel 1 setup icon. b Click the Offset control arrows to change the offset value or click on the offset value and enter 120 mV in the dialog box.
Page 54 Chapter 3: Testing Performance Offset Performance Test Change the channel 1 offset value to -120 mV. Set the Aux Out voltage to -120 mV. Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of screen) to return to 256 and then record the DMM voltage reading as V and the DMM-...
Page 55: Dc Measurement Accuracy (Single Cursor) Test
Chapter 3: Testing Performance DC Measurement Accuracy (Single Cursor) Test DC Measurement Accuracy (Single Cursor) Test Specifications DC Gain Accuracy ±1% of full scale at full resolution channel scale Offset Accuracy ±(2% of channel offset + 1% of full scale) 8 bits, ≥12 bits with averaging Vertical Resolution DC Voltage Measurement Accuracy...
Page 56 Chapter 3: Testing Performance DC Measurement Accuracy (Single Cursor) Test Notes • It is important to connect the BNC Tee adapter directly to the scope channel input to minimize ground potential differences between the scope and the test instruments and to ensure that the DMM measures the input voltage to the scope channel as accurately as possible.
Page 57 Chapter 3: Testing Performance DC Measurement Accuracy (Single Cursor) Test Set the Aux output voltage to +30 mV DC as follows: a Pull down the Utilities menu and select Calibration. b Change the Aux Output function to DC (top left corner). c Set the Level to 30 mV.
Page 58 Chapter 3: Testing Performance DC Measurement Accuracy (Single Cursor) Test Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of screen) to return to 256 and then record the DMM voltage reading (V ) and the scope Vavg reading (V ) in the DC Measurement Accuracy (Single Cursor) Test...
Page 59 Chapter 3: Testing Performance DC Measurement Accuracy (Single Cursor) Test Configure the scope to measure V avg on Channel 2 as follows: a Change the vertical sensitivity of channel 2 to 10 mV/div. b Click the V avg measurement icon on the left side of the screen. c When the Enter Measurement Info window is displayed, ensure that the V avg function is set up as follows and then click OK: Source = Channel 2...
Page 60: Analog Bandwidth - Maximum Frequency Check
Analog Bandwidth - Maximum Frequency Check Analog Bandwidth - Maximum Frequency Check Specification Analog Bandwidth (-3 dB) 54855A 6.0 GHz 54854A 4.0 GHz 54853A 2.5 GHz Equipment Required Description Critical Specifications Recommended Model/ Part Numbers Maximum Frequency ≥6 GHz Microwave CW...
Page 61 Chapter 3: Testing Performance Analog Bandwidth - Maximum Frequency Check Connections Power Meter 5485x Scope Under Test Microwave Generator 54855-67604 11667B Notes • Connect output 1 of the 11667B splitter to the scope Channel n input directly using the 54855-67604 adapter, without any additional cabling or adapters.
Page 62 Chapter 3: Testing Performance Analog Bandwidth - Maximum Frequency Check d Pull down the Setup menu, select Acquisition and then set up the acquisition parameters as follows: Memory Depth = Automatic Sampling rate = Maximum (20 GSa/s) Sin(x)/x Interpolation filter enabled Averaging enabled with # of Averages = 16 e Pull down the Measure menu, select Voltage and then select V rms.
Page 63 Chapter 3: Testing Performance Analog Bandwidth - Maximum Frequency Check Set the generator to apply a 50 MHz sine wave with a peak-to-peak amplitude of about 4 divisions. • Use the following table to determine the approximate required signal amplitude. The amplitude values in the table below are not absolutely required.
Page 64 Chapter 3: Testing Performance Analog Bandwidth - Maximum Frequency Check Press the Clear Display key on the scope, wait for the #Avgs value (top left corner of screen) to return to 16 and then record the scope V rms reading in the Analog Bandwidth - Maximum Frequency Check section of the Performance Test Record (Vout @ 50 MHz).
Page 65 Change the generator frequency to the maximum value for the model being tested as shown in the table below. It is not necessary to adjust the signal amplitude at this point in the procedure. Setting Model 54853A 54854A 54855A Maximum Frequency 2.5 GHz 4.0 GHz...
Page 66 Chapter 3: Testing Performance Analog Bandwidth - Maximum Frequency Check Change the scope set up as follows: a Change the channel vertical sensitivity to 20 mV/div. b Reset the horizontal scale to 16 ns/div (to display 8 cycles of a 50 MHz waveform). Change the generator output as follows: a Reset the generator frequency to 50 MHz.
Page 67: Horizontal Performance Verification
Horizontal Performance Verification This section contains the follow horizontal performance verification: • Time Base Accuracy Test • Delta-time Measurement Accuracy Test 3–23...
Page 68: Time Base Accuracy Test
Chapter 3: Testing Performance Time Base Accuracy Test Time Base Accuracy Test Specification Time Scale Accuracy ±1 ppm peak Equipment Required Description Critical Specifications Recommended Model/Part Numbers Sine Wave with Amplitude ≤6 Vp-p into 50Ω 10 MHz Signal Source Agilent E8247C with Opt 520 or Frequency Accuracy better than 0.4 ppm Agilent 82712B with Opt 1E5 or Output resistance = 50Ω...
Page 69 Chapter 3: Testing Performance Time Base Accuracy Test Set up the scope to measure frequency as follows: a Click the Frequency measurement icon on the left side of the screen, or b Pull down the Measure menu, select Time and then select Frequency. Frequency measurement icon...
Page 70 Chapter 3: Testing Performance Time Base Accuracy Test Increase the time base setting to 2 ms/div and then press the Clear Display key. a If at least 1 complete cycle is displayed and NO question marks are displayed in the frequency measurement area at the bottom of the screen, record the max frequency in the Aliased Frequency Measurement field in the Time Base Accuracy Test section of the Performance Test Record.
Page 71 Chapter 3: Testing Performance Time Base Accuracy Test d In some cases, the time base clock will be too close in frequency to the input signal used in this test. If this is the case, a waveform like the one shown below will be displayed. If this case, it will be impossible to capture a full cycle of the aliased waveform.
Page 72: Delta-Time Measurement Accuracy Test
Peak: ±[(7.0 ps) + (1x10-6 * |reading|)] Signal peak-to-peak amplitude ≥5 divisions, vertical scale ≥10mV/div, signal rise time 155ps (54853A) ≤225 ps (54854A) 150 ps (54855A), sample rate = 20 GSa/s, sinx/x interpolation enabled, measurement threshold = fixed voltage at 50% level.
Page 73 Averaging enabled with # of Averages = 256 Set up the signal source to operate as follows: Frequency = 4 GHz (54855A and 54854A) or 2.5 GHz (54853A) Amplitude = ~7 divisions peak to peak (~+2.5 dBm) Set up the scope to measure period as follows: a Click the Period measurement icon on the left side of the screen, or b Pull down the Measure menu, select Time and then select Period.
Page 74 Chapter 3: Testing Performance Delta-time Measurement Accuracy Test Scroll down the measurement bar at the bottom of the screen so the min, max, std dev and # of meas fields are visible as shown below. Press the Clear Display key, then allow the # of meas field to increment to at least 256 and then press the Stop key.
Page 75: Trigger Performance Verification
• Internal Channel Trigger Accuracy Test • Low Sensitivity Measurements @ 1 GHz • Low Sensitivity Measurements @ 2.5 GHz (54853A) or 4 GHz (54854A and 54855A) • High Sensitivity Measurements @ Maximum Frequency: 2.5 GHz (54853A) or 4 GHz (54854A) or 6 GHz (54855A) •...
Page 76: Internal Channel Trigger Sensitivity Test
54855A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 4 GHz, <2.5 div @ 5 GHz 54854A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 4 GHz 54853A: 0.5 div p-p 0 to 2 GHz, 1.0 div p-p 2 to 2.5 GHz High sensitivity mode: 54855A: 0.2 div p-p 0 to 6 GHz...
Page 77 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test d Pull down the Setup menu, select trigger and then set up the trigger parameter as follows: Mode = Edge Source = Channel 1 Sweep = Auto Click on Conditioning and select Low Sensitivity. e Pull down the Setup menu, select Acquisition and then set up the acquisition parameters as follows: Memory Depth = Automatic...
Page 78 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Click the V p-p voltage measurement icon on the left side of the display and then coarsely adjust the signal amplitude until the mean amplitude is ≥ 500 mVp-p. Press the Clear Display key after each amplitude adjustment. V p-p measurement icon...
Page 79 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Measure the signal amplitude applied to channel 1 as follows: a Increase the vertical sensitivity of channel 1 until the displayed waveform is at least 4 divisions in amplitude and is not clipped. b Click the V p-p measurement icon on the left side of the screen.
Page 80 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Change the scope setup as follows: a Turn channel 2 display off. b Turn channel 3 display on. c Set channel 3 vertical sensitivity to 1.0 V/div. d Press the trigger Source key until 3 is illuminated. e Press the trigger Sweep key until Auto is illuminated.
Page 81 Averaging enabled with # of Averages = 16 Set up the source generator as follows: Frequency = 2.5 GHz (if testing 54853A) or 4.0 GHz (if testing 54854A or 54855A) Amplitude = -1.5 dBm Click the V p-p measurement icon on the left side of the display and then coarsely adjust the signal amplitude until the mean amplitude is ≥1.0 Vp-p.
Page 82 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Turn off the V p-p measurement. Move the cable from channel 1 to channel 2. Change the scope setup as follows: a Turn channel 1 display off. b Turn channel 2 display on. c Set channel 2 vertical sensitivity to 1.0 V/div.
Page 83 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Low Sensitivity Measurements @ 5 GHz (54855A only) Connect the microwave signal source to scope channel 1. Set up the scope as follows: a Press the Default Setup key. b Set channel 1 vertical sensitivity to 1.0 V/div. c Set the horizontal scale to 2 ns/div.
Page 84 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Turn off the V p-p measurement. Move the cable from channel 1 to channel 2. Change the scope setup as follows: a Turn channel 1 display off. b Turn channel 2 display on. c Set channel 2 vertical sensitivity to 1.0 V/div.
Page 85 Averaging enabled with # of Averages = 16 Set up the source generator as follows: Frequency = 2.5 GHz (if testing 54853A), 4.0 GHz (if testing 54854A), or 6.0 GHz (if testing 54855A) Amplitude = -10.0 dBm Click the V p-p measurement icon on the left side of the display and then coarsely adjust the signal amplitude until the mean amplitude is ≥200 mVp-p.
Page 86 Chapter 3: Testing Performance Internal Channel Trigger Sensitivity Test Turn off the V p-p measurement. Move the cable from channel 1 to channel 2. Change the scope setup as follows: a Turn channel 1 display off. b Turn channel 2 display on. c Set channel 2 vertical sensitivity to 1.0 V/div.
Page 87: Trigger Jitter Test
Connect the microwave signal source to scope channel 1 as shown in the connection diagram above. Set up the source to operate as follows: Frequency = 4 GHz (54855A and 54854A) or 2.5 GHz (54853A) Amplitude = +10 dBm 3–43...
Page 88 Chapter 3: Testing Performance Trigger Jitter Test Set up the scope as follows: a Press Default Setup. b Set channel 1 vertical sensitivity to 200 mV/div. c Set the horizontal scale to 10 ps/div. d Trigger Mode: Edge triggered, Rising edge. e Trigger Source = Channel 1.
Page 89 Chapter 3: Testing Performance Trigger Jitter Test c Pull down the Analyze menu and select Histogram. d Set up the histogram parameters as shown below: Orientation = Horizontal Scale Source = Channel 1 Top Limit (By) = 0.0 V Bottom Limit (Ay) = 0.0 V Left Limit (Ax) = -10 ps Right Limit (Bx) = 10 ps Histogram is enabled...
Page 90 Chapter 3: Testing Performance Trigger Jitter Test Move the cable from channel 1 to channel 2. Turn the channel 1 display off and turn channel 2 display on. a Set channel 2 vertical sensitivity to 200 mV/div. b Change the trigger source to channel 2. Pull down the Analyze menu and select Histogram.
Page 91: Agilent 54853A/54A/55A Performance Test Record
Chapter 3: Testing Performance Agilent 54853A/54A/55A Performance Test Record Agilent 54853A/54A/55A Performance Test Record Offset Performance Test Zero Error Test Vertical Sensitivity Test Limits Channel 1 Channel 2 Channel 3 Channel 4 10 mV/div -0.8 mV to +0.8 mV 20 mV/div -1.6 mV to +1.6 mV...
Page 92 Chapter 3: Testing Performance Agilent 54853A/54A/55A Performance Test Record DC Measurement Accuracy (Single Cursor) Test Vertical Sensitivity V Max Scope Calculated Calculated Aux Out Scope Error (V Vscope Vscope Setting Lower Limit Upper Limit DMM – Channel 1 10 mV/div +30 mV 1.6 mV...
Page 93 Chapter 3: Testing Performance Agilent 54853A/54A/55A Performance Test Record Analog Bandwidth - Maximum Frequency Check Max frequency: 54853A = 2.5 GHz, 54854A = 4.0 GHz, 54855A = 6.0 GHz Measurement Vin @ 50 MHz Vout @ 50 MHz Calculated Vin @ Max Freq...
Page 94 Low Sensitivity Measurements and Results @ 2 GHz 0.5 division 0.5 division 0.5 division 0.5 division Low Sensitivity Measurements and Results @ 4 GHz (54855A &54854A) or 2.5 GHz (54853A) 1.0 division 1.0 division 1.0 division 1.0 division Low Sensitivity Measurements and Results @ 5 GHz (54855A only) <2.5 division...
Page 95: Calibration
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 flat panel display (FPD) 4-4 To run the self calibration 4-7 Calibration...
Page 96: Equipment Required
Calibration This chapter provides firmware (self calibration) procedures for the Agilent Technologies 54853A/54A/55A 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 97: Operating Hints
Chapter 4: Calibration Operating Hints Some knowledge of operating the Agilent Technologies 54853A/54A/55A 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 98: To Check The Flat Panel Display (Fpd)
Chapter 4: Calibration 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 Width ≤...
Page 99 Chapter 4: Calibration To check the flat panel display (FPD) Figure 4-1 Click to start the test Select Screen to do the flat-panel display test Starting the Screen Test Click Start Self Test. A new dialog appears with a series of radio buttons that allow selection of different background colors.
Page 100 Chapter 4: Calibration To check the flat panel display (FPD) Select a color by clicking the radio button for that color. Carefully check the colored region for pixels colored differently than the current selection. These pixels are either inactive or stuck. If black (when a color or white is selected), they are inactive;...
Page 101: To Run The Self Calibration
Chapter 4: Calibration 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 102 Chapter 4: Calibration To run the self calibration Figure 4-3 Clear this check box before starting calibration Click here to start calibration Calibration Dialog Click Start, then follow the instructions on the screen. The routine will ask you to do the following things in sequence: a Disconnect everything from all inputs and Aux Out.
Page 103: Troubleshooting
Safety 5-2 Tools Required 5-2 ESD Precautions 5-2 Keystroke Conventions 5-2 Default Setup 5-3 To install the fan safety shield 5-3 To troubleshoot the instrument 5-4 Primary Trouble Isolation 5-6 No Display Trouble Isolation 5-10 POST Code Listing 5-19 Power Supply Trouble Isolation 5-22 To check the keyboard;...
Page 104: 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 54810-00601) to protect your fingers from the fan blades. Tools Required...
Page 105: 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 106: To Troubleshoot The Instrument
Chapter 5: Troubleshooting To troubleshoot the instrument To troubleshoot the instrument 7KH WURXEOHVKRRWLQJ SURFHGXUH LV XVHG WR LVRODWH SUREOHPV WR D IDXOW\ DVVHPEO\ :KHQ \RX ILQG WKH IDXOW\ DVVHPEO\ XVH WKH GLVDVVHPEO\ DQG DVVHPEO\ SURFHGXUHV LQ FKDSWHU WR UHSODFH WKH DVVHPEO\ 7KH SULPDU\ SURFHGXUDO WRRO LQ WKLV VHFWLRQ LV WKH IORZFKDUW 7KH IORZFKDUW FRQWDLQV WKH HQWLUH WURXEOHVKRRWLQJ SDWK IURP D IDLOHG LQVWUXPHQW WR D ZRUNLQJ RQH DQG ZLOO GLUHFW \RX LQ DQ RUGHUO\ PDQQHU WKURXJK WKH SRVVLEOH IDLOXUH V\PSWRPV 5HIHUHQFH OHWWHUV RQ WKH...
Page 107 Chapter 5: Troubleshooting To troubleshoot the instrument Primary Trouble Isolation Flowchart Primary Trouble Isolation Perform power-up Check display Go to ’No Display screen display Debug’ problems Check front panel response. Check processor temperature? Go to ’Keyboard knob and key test Troubleshooting’...
Page 108: Primary Trouble Isolation
Chapter 5: Troubleshooting Primary Trouble Isolation Primary Trouble Isolation 7KH DFWLRQV LQ WKH 3ULPDU\ 7URXEOH ,VRODWLRQ DUH GRQH ZLWKRXW GLVDVVHPEOLQJ WKH LQVWUXPHQW ,QWHUDFWLRQ RI WKH IURQW SDQHO ZLWK WKH UHVW RI WKH LQVWUXPHQW DQG RWKHU LQGLFDWRUV DUH XVHG WR KHOS LGHQWLI\ WKH SUREOHP DUHD $ OHWWHU LV DVVLJQHG WR ER[HV LQ WKH IORZFKDUW 7KH OHWWHU FRUUHVSRQGV WR D VSHFLILF VHFWLRQ LQ WKH UHIHUHQFH WH[W %H VXUH WR XVH WKH IORZFKDUW LWVHOI IRU \RXU WURXEOHVKRRWLQJ SDWK Perform power-up.
Page 109 Chapter 5: Troubleshooting Primary Trouble Isolation Check the processor temperature. If the processor temperature is over 70 °C, the motherboard will turn on an audible alarm. If the alarm can be heard: 1 Reboot the oscilloscope. 2 Press del key when the splash screen is seen. 3 Scroll down to PC Health Status and press the Enter key.
Page 110 Chapter 5: Troubleshooting Primary Trouble Isolation Figure 5-3 When you push a key or turn a knob in both directions, the corresponding symbol on this screen turns green. Knob and Key Self Test Screen 4 Push each key on the keyboard until you have pushed all keys. :KHQ \RX SXVK D NH\ WKH FRUUHVSRQGLQJ NH\ V\PERO RQ WKH GLVSOD\ VKRXOG FKDQJH IURP UHG WR JUHHQ 5 Turn each knob in both directions until you have turned all knobs.
Page 111 Chapter 5: Troubleshooting Primary Trouble Isolation 8VH WKH IROORZLQJ SURFHGXUH WR WHVW WKH IURQWSDQHO /(' OLJKWHPLWWLQJ GLRGH LQGLFDWRUV 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. 7KH /(' WHVW VFUHHQ DSSHDUV ZKLFK VKRZV D V\PEROLF UHSUHVHQWDWLRQ RI DOO IURQW SDQHO /(' LQGLFDWRUV 6HH ILJXUH Figure 5-4...
Page 112: No Display Trouble Isolation
Chapter 5: Troubleshooting No Display Trouble Isolation No Display Trouble Isolation No Display Debug Remove acquisition board. Plug unit in and turn it on. Remove the probe interface board cable from the power board. Do fans turn on & does Go to ’Front Panel Check the power board using motherboard beep...
Page 113: Front Panel Display Debug
Chapter 5: Troubleshooting Front Panel Display Debug Front Panel Display Debug Front Panel Display Debug Turn unit on. Connect external monitor to VGA port. Does Connect external display appear monitor to secondary on monitor display port. Does display appear Check ffc display on monitor cable connection to front Panel...
Page 114 Disconnect the power cable before working around the fan. Use extreme caution in working with the instrument when the cover is removed. Install the fan safety shield (Agilent Technologies P/N 54810-00601) on the side of the chassis over the fan. Failure to observe these precautions may result in injury.
Page 115: Motherboard Verification
Chapter 5: Troubleshooting Motherboard Verification Motherboard Verification 7KH PRWKHU ERDUG YHULILFDWLRQ UHTXLUHV WKH XVH RI HLWKHU D :DWW RU JUHDWHU $7; 3& SRZHU VXSSO\ RU D WHVW IL[WXUH WKDW FDQ EH EXLOW DV IROORZV 8VLQJ DQ $03 FRQQHFWRU 7\FR (OHFWURQLFV SDUW QXPEHU RU $JLOHQW SDUW QXPEHU VROGHU ZLUHV EHWZHHQ WKH SLQV DV VKRZQ LQ WKH )LJXUH Figure 5-5 5–13...
Page 116 Chapter 5: Troubleshooting Motherboard Verification Motherboard Verification Obtain a 300 Watt or greater ATX PC power supply, or build a test fixture per instructions Disconnect ac power. Plug motherboard connector of ATX Using Plug test fixture into sense line of supply into ATX power power harness.
Page 117 Chapter 5: Troubleshooting Motherboard Verification Check that the motherboard switch cable is seated properly. cable Motherboard verification Pull cable from PCI bridge board. Use tweezers to short two pins together. Do fans turn on & does Go to ’Front Panel motherboard beep Button Debug’.
Page 118: To Configure The Motherboard Jumpers And Setup Bios
Chapter 5: Troubleshooting To configure the motherboard jumpers and setup BIOS To configure the motherboard jumpers and setup BIOS ,I WKH %,26 VHWWLQJV EHFRPH FRUUXSWHG WKH ,QILQLLXP RVFLOORVFRSH 3& PRWKHUERDUG ZLOO QRW UHFRJQL]H WKH KDUG GULYH DQG WKH XQLW ZLOO QRW ERRW 7R GHWHUPLQH WKH FRUUHFW %,26 VHWXS SURFHGXUH IRU \RXU FRQILJXUDWLRQ GHWHUPLQH WKH IROORZLQJ LQIRUPDWLRQ •...
Page 119 Chapter 5: Troubleshooting To configure the motherboard jumpers and setup BIOS Configure the MOT series VP-22 Motherboard BIOS parameters. 8VH WKLV SURFHGXUH WR VHW WKH 027 93 PRWKHUERDUG %,26 Connect the power cable to the Infiniium oscilloscope. Connect the external keyboard to the rear panel. Press the delete key when you see the following prompt on the bottom of the screen Press TAB to Show POST screen, DEL to enter SETUP, F12 to select boot device.
Page 120 Chapter 5: Troubleshooting To configure the motherboard jumpers and setup BIOS BIOS Setup Procedure Go to Load Setting 2 Defaults and press Enter key. Select Y to load the defaults of BIOS Setting 2 and press the Enter key. If you have a power board part number 54855-66502 then perform the following steps. Otherwise, go to step 7.
Page 121: Post Code Listing
Chapter 5: Troubleshooting POST Code Listing POST Code Listing 8VH WKH IROORZLQJ OLVWLQJ WR WURXEOHVKRRW WKH PRWKHUERDUG <RX ZLOO QHHG D 3267 3RZHU2Q 6HOI 7HVW FDUG LQVWDOOHG LQ DQ 3&, VORW WR XVH WKLV OLVWLQJ POST Code Listing Checkpoint Code DEscription Test CMOS read/write functionality Early Chipset Initialization.
Page 122 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 123: Front Panel Debug
Chapter 5: Troubleshooting Front Panel Debug Front Panel Debug Front Panel Debug Follow the keyboard troubleshooting guide for just the power button. Go to ’Primary Trouble Isolation’. 5–21...
Page 124: Power Supply Trouble Isolation
Chapter 5: Troubleshooting Power Supply Trouble Isolation Power Supply Trouble Isolation Power Supply Verification With the ac power plugged in and with all the cables disconnected to the motherboard and power board from the power supply, the power supply should turn on. Does Check ac power cables to power supply...
Page 125 Chapter 5: Troubleshooting Power Supply Trouble Isolation 7KHVH WURXEOH LVRODWLRQ LQVWUXFWLRQV KHOS LVRODWH WKH SUREOHP WR WKH DVVHPEO\ OHYHO ZKHQ WKH SRZHU VXSSO\ LV QRW RSHUDWLQJ %HFDXVH RI DGYDQFHG SRZHU VXSSO\ SURWHFWLRQ IHDWXUHV WKH SUREOHP PD\ QRW EH ZLWK WKH VXSSO\ LWVHOI DQG WKHUHIRUH \RX ZLOO QHHG WR ZRUN WKURXJK WKH SURFHGXUH V\VWHPDWLFDOO\ WR GHWHUPLQH WKH VRXUFH RI WKH IDXOW Check the power supply voltages on the power supply.
Page 126: Power Board Trouble Isolation
Chapter 5: Troubleshooting Power Board Trouble Isolation Power Board Trouble Isolation Power Board Verification Ensure unit is configured as follows: Power supply connected to power board. Acquisition board removed. Probe interface board, A9, disconnected from the power board. Connect ac power. Verify voltages on power board.
Page 127: Autoprobe Board Trouble Isolation
Chapter 5: Troubleshooting AutoProbe Board Trouble Isolation AutoProbe Board Trouble Isolation AutoProbe Board Power Problem Inspect ffc cables between probe interface board and power board, W17 and the probe interface board and AutoProbe board, W8. Cables Replace bad cable. Ensure cable, W17 is connected into the power board and the probe interface board correctly.
Page 128: To Check The Keyboard; Troubleshooting Procedure
Chapter 5: Troubleshooting To check the keyboard; Troubleshooting Procedure To check the keyboard; Troubleshooting Procedure 8VH WKLV SURFHGXUH RQO\ LI \RX HQFRXQWHU NH\ IDLOXUHV LQ WKH NH\ERDUG WHVW SURFHGXUH ,I DQ\ NQREV IDLO UHSODFH WKH NH\ERDUG DVVHPEO\ Disconnect the power cord and remove the cover. Remove the front panel assembly.
Page 129: To Check The Leds
Chapter 5: Troubleshooting To check the LEDs To check the LEDs ,I \RX VHH D IDLOXUH ZLWK WKH $XWR RU 7ULJ G /('V FKHFN WKH YROWDJH DW SLQ RI : ZLWK : GLVFRQQHFWHG IURP WKH NH\ERDUG 7KH YROWDJH VKRXOG EH DV IROORZV •...
Page 130: To Troubleshoot The Acquisition System
Chapter 5: Troubleshooting To troubleshoot the acquisition system To troubleshoot the acquisition system Acquisition Trouble Isolation Does Does Replace the interface board, A10. If acquisition interface that does not work, replace the vertical test test group display board. group pass? pass? Does Does...
Page 131: 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. $ GLDORJ ER[ DSSHDUV VKRZLQJ WKH FXUUHQW YHUVLRQ QXPEHU IRU WKH VFRSH VRIWZDUH DQG RQ OLQH LQIRUPDWLRQ V\VWHP VRIWZDUH 7KLV LQIRUPDWLRQ PD\ EH XVHIXO ZKHQ FRQWDFWLQJ $JLOHQW 7HFKQRORJLHV IRU IXUWKHU VHUYLFH LQIRUPDWLRQ 6HH ILJXUH Figure 5-7...
Page 132: To Check Probe Power Outputs
Chapter 5: Troubleshooting To check probe power outputs To check probe power outputs 3UREH SRZHU RXWSXWV DUH RQ WKH IURQW SDQHO VXUURXQGLQJ HDFK %1& LQSXW Use the table and figure to the right Supply to check the power output at the connectors.
Page 133: To Check The Svga Display Board Video Signals
Chapter 5: Troubleshooting To check the SVGA display board video signals To check the SVGA display board video signals 7KH YLGHR VLJQDOV DUH FKHFNHG RQ WKH SLQ FRQQHFWRU - RQ WKH 69*$ GLVSOD\ ERDUG $ 8VH D 0+] JHQHUDOSXUSRVH RVFLOORVFRSH VXFK DV WKH $JLOHQW 7HFKQRORJLHV % WR YHULI\ WKH VLJQDOV (YHQQXPEHUHG SLQV DUH RQ WKH WRS VLGH RI WKH FRQQHFWRU 7KH YLGHR VLJQDOV DUH SUHVHQW GXULQJ WKH V\VWHP ERRW SURFHVV EHIRUH WKH EDFNOLJKWV FRPH RQ ,I WKH VLJQDOV DUH QRW SUHVHQW VXVSHFW WKH GLVSOD\ FDUG ,I WKH VLJQDOV DUH SUHVHQW DQG WKH EDFNOLJKWV DUH RQ...
Page 134: To Check The Backlight Inverter Voltages
Chapter 5: Troubleshooting To check the backlight inverter voltages To check the backlight inverter voltages WAR N IN G SHOCK HAZARD! The backlight inverter assembly, which is mounted at the front corner of the oscilloscope near the flat-panel display, can operate at a voltage as high as 1.3 kV ac .
Page 135: Replacing Assemblies
ESD Precautions 6-2 Tools Required 6-2 To return the oscilloscope to Agilent Technologies for service 6-3 To remove and replace the covers 6-4 To disconnect and connect Mylar flex cables 6-6 To remove and replace the AutoProbe assembly 6-7 To remove and replace the probe power and control board 6-9...
Page 136: Esd Precautions
Replacing Assemblies Use the procedures in this chapter when removing and replacing assemblies and parts in the Agilent Technologies 54853/54/55A oscilloscopes. 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 137: To Return The Oscilloscope To Agilent Technologies For Service
Pack the oscilloscope 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 oscilloscope and place it in a box that does not allow movement during shipping.
Page 138: To Remove And Replace The Covers
Chapter 6: Replacing Assemblies To remove and replace the covers To remove and replace the covers 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. Remove the two Torx T15 screws securing the side handle.
Page 139 Chapter 6: Replacing Assemblies To remove and replace the covers Remove the four Torx T20 screws that secure the bottom cover to the rear of the chassis. Pull the bottom cover out and away from the rear of the chassis. Be careful not to catch the feet on the chassis.
Page 140: 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 CA UT IO N The mylar flex 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 141: 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 When necessary, refer to other removal procedures. Figure 5-5 AutoProbe Assembly AutoProbe Assembly Disconnect the power cable and remove the top and bottom covers. Remove the AutoProbe assembly, the subpanel, and the probe connector assembly that fits around the front-panel BNC connectors, by doing the following: a Place the unit so the bottom is facing up.
Page 142 Chapter 6: Replacing Assemblies To remove and replace the AutoProbe assembly d Disconnect the mylar flex cable W8 from the AutoProbe board. See “To disconnect and connect Mylar flex cables” in this chapter. Figure 5-7 Disconnect mylar flex cable W8 here Pushing Out the AutoProbe Faceplate To replace the AutoProbe assembly, reverse the above procedure.
Page 143: To Remove And Replace The Probe Power And Control Board
Chapter 6: Replacing Assemblies To remove and replace the probe power and control board To remove and replace the probe power and control board When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Disconnect the mylar flex cable W8 that connects the probe power and control assembly to the AutoProbe assembly.
Page 144 Chapter 6: Replacing Assemblies To remove and replace the probe power and control board 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 145: 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 When necessary, refer to other removal procedures. Figure 5-10 Backlight Inverter Board Backlight Inverter Board WAR N IN G SHOCK HAZARD! The backlight inverter assembly, which is mounted at the front corner of the oscilloscope near the flat-panel display, operates at a high voltageof 1.3 kV ac .
Page 146 Chapter 6: Replacing Assemblies To remove and replace the backlight inverter board Disconnect the two backlight cables from the top and bottom of the backlight inverter board. You can either stand the chassis on end or turn it over to gain access to both cables. Disconnect the backlight primary cable W21 from the side of the backlight inverter board.
Page 147: To Remove And Replace The Front Panel Assembly
Chapter 6: Replacing Assemblies To remove and replace the front panel assembly To remove and replace the front panel assembly When necessary, refer to other removal procedures. Disconnect the power cable and remove the top and bottom covers. Remove the Auto-Probe assembly A16 and Mylar flex cable W8. Using a 5/8”...
Page 148 Chapter 6: Replacing Assemblies To remove and replace the front panel assembly Disconnect the backlight primary cable W21, flat-panel display driver cable W11, and keyboard cable W12. Figure 5-14 Top edge front panel Backlight primary cable W21 Keyboard cable W12 Flat-panel display driver cable W11 Disconnecting W21 Backlight Primary Cable, W11 Display Driver Cable, and W12 Keyboard Cable...
Page 149 Chapter 6: Replacing Assemblies To remove and replace the front panel assembly Remove the two Torx T10 screws that secure the power supply support bracket to the front panel assembly. Pull the front panel assembly away from the chassis, being careful to feed the ribbon cables W16 and W20 out through the slot in the front of the chassis and not to damage the backlight invertor board.
Page 150: 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 Where necessary, refer to other removal procedures. Disconnect the power cable and remove the cover. Remove the front panel assembly from the chassis. Remove the ten Torx T10 screws that secure the front panel cover plate to the front casting.
Page 151 Chapter 6: Replacing Assemblies To remove and replace the keyboard and flat-panel display assemblies To remove the main keyboard, disconnect the cursor keyboard cable W13, pull off the knobs, and lift out the keyboard. Figure 5-17 Main Keyboard Knobs and Cable To remove the flat-panel display from the front-panel cover plate: a Disconnect the two backlight cables from the backlight inverter board (see previous figure).
Page 152 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 153: 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 When necessary, refer to other removal procedures. Disconnect the power cable and remove the top and bottom covers. Remove the AutoProbe assembly. Using a 5/8”...
Page 154 Chapter 6: Replacing Assemblies To remove and replace the acquisition board assembly Figure 5-20 Torx Line T10 (4) Sync Cable Torx T10 10 MHz Ref (16 in heat SMB Cable Aux Trig In sinks) SMB Cable Acquisition Cable W3 Torx T10 (4) Probe Comp...
Page 155 Chapter 6: Replacing Assemblies To remove and replace the acquisition board assembly Carefully lift the back of the board to separate the acquisition board connectors from the power distribution board. Lift the board back from the front panel until the BNC connectors clear the front panel, then lift the board away from the chassis.
Page 156: To Remove And Replace The Power Regulator Distribution Board
Chapter 6: Replacing Assemblies To remove and replace the power regulator distribution board To remove and replace the power regulator distribution board When necessary, refer to other removal procedures. Disconnect the power cable and remove the top and bottom covers. Remove the Acquisition board assembly.
Page 157: 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 When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Remove the Torx T15 screw that secures the GPIB board to the rear of the chassis. Pull the board up to disengage it from the motherboard, then lift up and out of the chassis.
Page 158: To Remove And Replace The Pci Bridge Board
Chapter 6: Replacing Assemblies To remove and replace the PCI bridge board. To remove and replace the PCI bridge board. When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Disconnect these cables from the A21 PCI bridge board: •...
Page 159: 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 When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Disconnect these cables from the SVGA display board: •...
Page 160: To Remove And Replace The Floppy Disk Drive
Chapter 6: Replacing Assemblies To remove and replace the floppy disk drive To remove and replace the floppy disk drive When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Disconnect mylar flex cable W23 at the rear of the floppy disk drive. Using a T8 driver remove the two side screws holding the floppy disk drive in place.
Page 161: To Remove And Replace The Internal Hard Disk Drive
Chapter 6: Replacing Assemblies To remove and replace the internal hard disk drive To remove and replace the internal hard disk drive IDisconnect the power cable and remove the top cover. If the oscilloscope has option 017 (removeable hard disk drive) installed then there is no internal hard disk drive.
Page 162 Chapter 6: Replacing Assemblies To remove and replace the internal hard disk drive Figure 5-28 Screw Screws Shock Mount Ground Plate Cable Hard Disk Drive Removing the Internal Hard Disk Drive Lift the disk drive assembly enough to clear the lower shock mounts, then move assembly toward fans enough to clear the chassis bracket under the floppy disk drive, then lift the disk drive out of the chassis.
Page 163: 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 When necessary, refer to other removal procedures. Disconnect the power cable and remove the top cover. Remove the following cables from the back of the CD-ROM drive: •...
Page 164 Chapter 6: Replacing Assemblies To remove and replace the CD-ROM drive Remove the CD-ROM Adapter Board from the rear of the CD-ROM drive. To replace the CD-ROM drive, reverse the above procedure with a new drive. 6–30...
Page 165: To Remove And Replace The Motherboard
Chapter 6: Replacing Assemblies To remove and replace the motherboard To remove and replace the motherboard 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. Disconnect the power cable and remove the top and bottom covers.
Page 166: To Remove And Replace The Motherboard
Chapter 6: Replacing Assemblies To remove and replace the motherboard Remove the cable that goes to the mother board connector IDE1 at the motherboard endo of the cable. If option 017 (removable hard drive) is installed, remove the CDROM cable that goes to the motherboard connector IDE2 at the motherboard end of the cable.
Page 167: 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 When necessary, refer to other removal procedures. WAR N IN G SHOCK HAZARD! If the power supply is defective it could have a dangerous charge on some capacitors. This charge could remain for many days after removing power from the supply.
Page 168 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. Remove the two Torx T10 screws that secure the support bracket to the front chassis. If you do not have option 017 (removeable hard disk drive), follow the instructions for removing the hard disk drive found earlier in this chapter.
Page 169 Chapter 6: Replacing Assemblies To remove and replace the power supply Figure 5-33 Without option 017 screw screws Support bracket Power supply cable Power supply Main power input cable Press retaining latches to release Hard disk drive Mounting screws bracket With option 017 T15 screws (4) Removing Hard Disk, Support Bracket, and Power Supply...
Page 170 Chapter 6: Replacing Assemblies To remove and replace the power supply Lift the supply up and out of the chassis. To replace the supply, reverse the installation procedure. 6–36...
Page 171: To Remove And Replace The Fans
One cable is on the top of the chassis and one cable is on the bottom of the chassis. Remove the fan bracket securing the fan to the chassis. Use service kit tool The ATX Service Kit (Agilent Technologies part number 54845-68803) has instructions and a tool to assist with fan bracket removal. Figure 5-34...
Page 172 6–38...
Page 173: 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 174: 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 175: 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 176 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 177: Exploded Views
Chapter 7: Replaceable Parts Exploded Views Exploded Views Front Frame and Front Panel 7–5...
Page 178 Chapter 7: Replaceable Parts Exploded Views Fan and Acquisition Assembly 7–6...
Page 179 Chapter 7: Replaceable Parts Exploded Views Power Supply and PC Motherboard without option 017 7–7...
Page 180 Chapter 7: Replaceable Parts Exploded Views Power Supply and PC Motherboard with option 017 7–8...
Page 181 Chapter 7: Replaceable Parts Exploded Views Sleeve and Accessory Pouch 7–9...
Page 182: 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 183 Description Exchange Assemblies 54853-69501 4-CH ACQUISITION ASSEMBLY (Agilent Model 54853A) 54853-69503 4-CH ACQUISITION ASSEMBLY (Agilent Model 54853A) for use with software versions V.A.03.10 or higher 54854-69501 4-CH ACQUISITION ASSEMBLY (Agilent Model 54854A) 54854-69504 4-CH ACQUISITION ASSEMBLY (Agilent Model 54854A) for use with software versions V.A.03.10 or higher...
Page 184 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description Electrical Assemblies 0950-4369 POWER SUPPLY 0950-3235 INVERTER BOARD 2090-0396 LCD DISPLAY PC Motherboard (Motorola Motherboard w/1.44 MByte Floppy Drive and CD ROM Drive) 86100-66517 CDROM ADAPTER BOARD (NOT ON OPTION 017) 54810-66541 CDROM ADAPTER BOARD (WITH OPTION 017) 0950-4411...
Page 185 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description 0515-0375 MS MSx0.5 16 MM LG 0515-0365 SCR MACHINE 0515-2691 MS M2.6X0.45 6 MM PAN HEAD 54542-26101 GROUND LUG 2190-0027 WIL.256 .478 .02 2950-0072 NUTH 1/4-32 .062 0515-0666 M3 SCREW 0515-0368...
Page 186 Chapter 7: Replaceable Parts Replaceable Parts List Replaceable Parts Ref. Agilent Part Des. Number Description 54855-61602 KEYBOARD CABLE 54855-61608 PROBE POWER CABLE 54855-61606 FAN CABLE 54801-61626 KEYBOARD INTERCONNECT 54810-61605 BACKLIGHT POWER CABLE 54801-61624 DISPLAY JUMPER CABLE 54855-61610 FLOPPY DRIVE CABLE 54855-61618 AUX TRIG OUT CABLE 01680-61625...
Page 187: Theory Of Operation
Block-Level Theory 8-3 Acquisition Theory 8-5 Theory of Operation...
Page 188 Chapter 8: Theory of Operation Backlight Display GPIB Scope Driver Board Interface Flat Panel Display PCI BUS Motherboard on/off Acquisition Main Cursor switch on/off PCI Bridge Keyboard Keyboard switch Autoprobe Carefree Power Acquisition Board Power Board Probe Supply Board 6 Fans 4 chan external trig...
Page 189: Block-Level Theory
Theory of Operation Theory of operation is included only as supplemental information. Block-Level Theory The Agilent Technologies 54853A/54A/55A Oscilloscopes have four channels which are individually sampled up to 20 GSa/s. Each channel stores up to 256 Kbytes of memory. The bandwidths are: 54853A 2.5 GHz...
Page 190 Chapter 8: Theory of Operation Block-Level Theory Data Calibrator 20 Gs/s 32MB Preamp Management SDRAM ASIC Aux out Data 20 Gs/s 32MB Preamp Management SDRAM ASIC Trig in External Logic Trigger Trigger Trigger Chip Data 20 Gs/s 32MB Preamp Management SDRAM ASIC Data...
Page 191: Acquisition Theory
Chapter 8: Theory of Operation Acquisition Theory Acquisition Theory The acquisition board is part of a PC system complete with a computer motherboard, power supply, and LCD display. It is essentially a device on the PCI bus connected with an 80-pin ribbon cable through the PCI-bridge board.
Page 192 8–6...
Page 193 • Do not install substitute parts or perform any unauthorized modification to the instrument. Agilent Technologies P.O. Box 2197 1900 Garden of the Gods Road Colorado Springs, CO 80901...
Page 194 Document Warranty WARNING The material contained in A WARNING notice this document is provided © Agilent Technologies, Inc. 2003 denotes a hazard. It calls “as is,” and is subject to attention to an operating being changed, without No part of this manual may be procedure, practice, or notice, in future editions.

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54855a 54854a

Agilent Technologies 54853A Service Manual

1 General Information

2 Setting up the Oscilloscope

3 Testing Performance

4 Calibration

5 Troubleshooting

6 Replacing Assemblies

7 Replaceable Parts

8 Theory of Operation

Quick Links

Troubleshooting

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Summary of Contents for Agilent Technologies 54853A

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Table of Contents