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90000 A-Series Service Guide

Calibration

What Is a Calibration?

A calibration is simply an oscilloscope self-adjustment. The purpose of a

calibration is performance optimization.
There are two ways to calibrate an Infiniium A-Series oscilloscope:
• A

user calibration

, also known as a

self calibration

. A user calibration includes

the minimum set of calibrations and is intended to be run by oscilloscope users.

It can include a time scale calibration.

• A service calibration is performed only by Keysight Service Center technicians.
The following section describes how to run a user calibration.

Summary of Contents for Infiniium 90000A Series

Page 1: ...Keysight Infiniium 90000 A Series Oscilloscopes Service Guide...

Page 2: ...stomers under its standard com mercial license which is embodied in its End User License Agreement EULA a copy of which can be found at http www keysight com find sweula The license set forth in the E...

Page 3: ...ed 15 Procedure 16 3 Testing Performance Verifying System Performance 20 Performance Test Interval 20 Performance Test Record 20 Test Order 20 Test Equipment 20 Vertical Performance Verification 21 Of...

Page 4: ...80 Returning the oscilloscope to Keysight Technologies for service 81 Removing and replacing the cover top plate and bottom plate 82 Removing and replacing the front panel bezel and front panel circui...

Page 5: ...cilloscopes Service Guide 5 Removing and replacing the USB or GPIB port 115 6 Replaceable Parts Ordering Replaceable Parts 118 Exploded Views 119 Replaceable Parts List 123 7 Theory of Operation Block...

Page 6: ...6 90000 A Series Oscilloscopes Service Guide...

Page 7: ...ies Oscilloscopes Service Guide 1 General Information Instruments Covered by this Service Guide 8 Performance Enhanced Versus Standard Models 9 Accessories Supplied 9 Specifications and Characteristic...

Page 8: ...after the release of this manual please check the Keysight Technologies website at www keysight com to see whether a newer version of this manual is available The following 90000 A Series oscilloscop...

Page 9: ...loscope you have is a standard one or a performance enhanced version check whether it has one handle or two handles Standard models have one handle performance enhanced models have two handles Accesso...

Page 10: ...o 4 000 meters 12 000 feet Installation Category II Power Requirements 100 240 V 47 63 Hz 800 W max for 4 channel models 100 240 V 50 Hz 100 208 V 50 60 Hz 800 W max for 8 channel models Voltage Fluct...

Page 11: ...General Information 1 90000 A Series Service Guide 11 Oscilloscope Dimensions The following pictures show the dimensions of the 90000 A Series oscilloscope...

Page 12: ...12 90000 A Series Service Guide 1 General Information...

Page 13: ...13 Keysight Infiniium 90000 A Series Oscilloscopes Service Guide 2 Calibration What Is a Calibration 14 Running a User Calibration 15...

Page 14: ...ways to calibrate an Infiniium A Series oscilloscope A user calibration also known as a self calibration A user calibration includes the minimum set of calibrations and is intended to be run by oscil...

Page 15: ...om channel to channel NOTE The oscilloscope must be warmed up with the oscilloscope application running for at least 30 minutes at ambient temperature before starting the calibration procedure Failure...

Page 16: ...nnect everything from all inputs and Aux Out b Select the level of calibration you want to perform Standard Calibration Time scale calibration will not be performed Time scale calibration factors from...

Page 17: ...ers for all oscilloscopes except the DSO90254A which can use a good quality BNC cable Failure to use the appropriate calibration cable will result in an inaccurate calibration d Connect the calibratio...

Page 18: ...18 90000 A Series Service Guide 2 Calibration...

Page 19: ...es 1 Performing the internal oscilloscope self tests to ensure the measurement system is functioning properly To perform the self tests Click Utilities Self Test Then select Scope SelfTest from the Av...

Page 20: ...r it is recommended to conduct the tests in the order presented as it represents an incremental approach to performance verification This approach may be useful if you are trying to troubleshoot a sus...

Page 21: ...A Series Service Guide 21 Vertical Performance Verification This section describes the following vertical performance verification tests Offset Accuracy Test DC Gain Accuracy Test Analog Bandwidth Te...

Page 22: ...efined as 8 vertical divisions Magnification is used below 5 mV div Below 5 mV div full scale is defined as 40 mV The major scale settings are 5 mV div 10 mV div 20 mV div 50 mV div 100 mV div 200 mV...

Page 23: ...o measure the average voltage V avg on channel 1 as follows a Change the vertical scale of channel 1 to 5 mV div b Click the Vertical Meas tab on the left side of the waveform window then drag and dro...

Page 24: ...Click Setup Acquisition In the Acquisition dialog box enable averaging and set of Averages to 256 b Change the vertical scale of channel 2 to 5 mV div c Drag and drop the Average voltage measurement i...

Page 25: ...ntial differences and to ensure that the DMM measures the input voltage to the oscilloscope channel as accurately as possible Differences in ground potential can be a significant source of measurement...

Page 26: ...6 and then record the DMM voltage reading as VDMM and the scope V avg reading as VScope in the Offset Accuracy Offset Gain Test section of the Performance Test Record 7 Change the offset value of the...

Page 27: ...nder test Record the results in the Offset Accuracy Offset Gain Test section of the Performance Test Record For each measurement set both the Aux Out voltage VAux Out and the Channel offset voltage to...

Page 28: ...f full scale at 5 mV div Full scale is defined as 8 vertical divisions Magnification is used below 5 mV div Below 5 mV div full scale is defined as 40 mV The major scale settings are 5 mV div 10 mV di...

Page 29: ...al differences and to ensure that the DMM measures the input voltage to the oscilloscope channel as accurately as possible Differences in ground potential can be a significant source of measurement er...

Page 30: ...6 Press Clear Display on the oscilloscope wait for the number of averages to return to 256 and then record the DMM voltage reading as VDMM and the scope V avg reading as VScope in the DC Gain Accurac...

Page 31: ...al scale values 1 V use the following equation For vertical scale values 1 V use the following equation 10 Repeat steps 3 to 9 for the remaining channel 1 vertical scale settings in the DC Gain Test s...

Page 32: ...quipment Required Description Critical Specifications Recommended Model Part Microwave CW Generator Maximum Frequency 14 GHz Power range 20 dBm to 16 dBm into 50 Output resistance 50 Keysight E8257D w...

Page 33: ...s shown in the preceding connection diagram 5 Set up the power meter to display measurements in units of Watts NOTE Connect output 1 of the 11667B splitter to the scope channel N input directly using...

Page 34: ...horizontal scale to 16 ns div to display 8 cycles of a 50 MHz waveform d Click Setup Acquisition and make sure the acquisition parameters are set up as follows Sin x x Interpolation Auto Averaging Dis...

Page 35: ...using the expression For example if the power meter reading is 4 0 W then Vin 4 0 10 6 50 1 2 14 1 mVrms Record the RMS voltage in the Analog Bandwidth Maximum Frequency Check section of the Performan...

Page 36: ...ter reading is 4 0 W then Vin 4 0 10 6 50 1 2 14 1 mVrms Record the RMS voltage in the Analog Bandwidth Maximum Frequency Check section of the Performance Test Record Vin Max Freq 14 Press Clear Displ...

Page 37: ...nce gain at 50 MHz for this scale setting 19 Repeat steps 11 through 14 to measure the gain at maximum frequency for this scale setting 20 Repeat steps 15 through 19 to complete measuring gains for th...

Page 38: ...tire Display as the Measurement Area and AC for the RMS Type 24 Repeat steps 7 to 20 to complete measuring gains for channel 3 25 Move the splitter to channel 4 and change the oscilloscope configurati...

Page 39: ...a Keysight service center The aging component scales linearly from the time since the last time base calibration and adds to the initial accuracy component Equipment Required Description Critical Spec...

Page 40: ...el 1 to 100 mV div 5 Set the oscilloscope s sampling rate to 100 kSa s 6 Set the oscilloscope s horizontal scale to 20 ms div 7 Set the measurement thresholds for all waveforms to a fixed voltage leve...

Page 41: ...red Time Scale Error ppm column of the Time Scale Accuracy table 13 Record the time since calibration in years in the table The calibration date can be found in the Calibration window Utilities Calibr...

Page 42: ...Recommended Test Interval 1 Year 2000 hours Date_____________________________ Recommended next test date ___________________ Ambient temperature ______________ Offset Accuracy Zero Error Test Vertica...

Page 43: ...iv 1 6 V 2 200 mV div 2 4 V 2 500 mV div 2 4 V 2 1 V div 2 4 V 2 Channel 2 5 mV div 400 mV 10 mV div 400 mV 2 20 mV div 400 mV 2 50 mV div 900 mV 2 100 mV div 1 6 V 2 200 mV div 2 4 V 2 500 mV div 2 4...

Page 44: ...V div 1 5 V 2 1 V div 2 4 V 2 Channel 2 5 mV div 15 mV 4 5 10 mV div 30 mV 2 20 mV div 60 mV 2 50 mV div 150 mV 2 100 mV div 300 mV 2 200 mV div 600 mV 2 500 mV div 1 5 V 2 1 V div 2 4 V 2 Channel 3 5...

Page 45: ...cale Measurement Vin 50 MHz Vout 50 MHz Calculated Gain 50 MHz Vin Max Freq Vout Max Freq Calculated Gain Max Freq Test Limit 3 dB Channel 1 5 mV div 10 mV div 20 mV div 50 mV div 100 mV div 200 mV di...

Page 46: ...vice Guide 3 Testing Performance Time Scale Accuracy Measured Time Scale Error ppm Years Since Calibration years Low Test Limit ppm High Test Limit ppm Pass Fail ___________ ___________ ___________ __...

Page 47: ...ing the Backlight Inverter Voltages 65 Checking the Display Board Video Signals 66 Front Panel Display Troubleshooting 67 Motherboard Verification 69 Setting Up the BIOS 71 Acquisition Backplane Assem...

Page 48: ...measurement Use the default setup when a procedure requires it by pressing Default Setup on the front panel WARNING INJURY CAN RESULT Use caution when the oscilloscope fan blades are exposed as they c...

Page 49: ...sure that you have the correct power cord The power cord provided is matched to the country of origin 2 Press the power button in the lower left corner of the front panel If the oscilloscope is workin...

Page 50: ...If any of the self tests fail go to the Acquisition Backplane assembly troubleshooting section Run the keyboard LED and touch screen self tests To verify correct keyboard operation 1 Click Utilities S...

Page 51: ...or keys do not work go to Keyboard Troubleshooting later in this chapter To test the front panel LED indicators 1 Click Utilities Self Test 2 Select LED Test from the drop down list box then click Sta...

Page 52: ...ed with channel 1 replace the acquisition board associated with that channel where channels 1 and 2 bottom acquisition board channels 3 and 4 top acquisition board If the failure is associated with ch...

Page 53: ...Under voltage fault section in this chapter b If it takes 4 seconds or more for the scope to lose power go to the Over temperature fault section in this chapter c If the scope never powers up or shuts...

Page 54: ...ator LEDs are located in the upper right corner of the backplane assembly The other LEDs in this section of the backplane assembly indicate over temperature or fan problems and are described in the Ov...

Page 55: ...fy that the 5 V standby potential from the bulk supply is good by confirming the green LED on the motherboard is lit If this LED is not lit when AC power is applied to the instrument the bulk 12 V sup...

Page 56: ...he supply from the oscilloscope Power supply disconnect 2 On the backplane assembly measure the resistance across the FET Q1409 located in the upper right corner of the backplane between 12 V and grou...

Page 57: ...put pins on the backplane assembly Cable connection into backplane 6 If the short is gone replace the motherboard assembly and confirm the unit will power on 7 If there is still a short circuit remove...

Page 58: ...arts with known good parts until you discover the problem 1 Replace the bulk 12 V power supply with a known good supply 2 If the oscilloscope still does not power on replace the motherboard with a kno...

Page 59: ...the trigger ICs fan failed It could also be that the rotation sensor for the trigger ICs fan failed This sensor lets the oscilloscope know that the fan is turning All four case fans do not turn It is...

Page 60: ...ee the trigger ICs fan on the backplane assembly Because this fan is on the bottom of the backplane it is somewhat hidden by the acquisition assemblies Look down the backplane board to see it from abo...

Page 61: ...circuitry has failed Normally you would have to turn the instrument on and leave it on for a while before you would see a shutdown due to temperature If all the fans are turning it is unlikely that t...

Page 62: ...One group is located near the center of the top edge of the backplane assembly just above the blue and red SATA cables If any of these LEDs are lit the backplane assembly must be replaced The other tw...

Page 63: ...s the channels 1 and 2 acquisition assembly and the one above it is the channels 3 and 4 acquisition assembly If you look through the fan and see any of these over voltage LEDs illuminated that acquis...

Page 64: ...FW H WHUQDO PRQLWRU F FOH SRZHU DQG FKHFN SRZHU XS VHTXHQFH 3RZHU XS GLVSOD HG RQ H W PRQLWRU 5HSODFH LVSOD RDUG R WR 9HULI LQJ DVLF 2SHUDWLRQ R WR 3RZHU 6XSSO 7URXEOHVKRRWLQJ R WR KHFNLQJ WKH DFNOLJK...

Page 65: ...he backlight is illuminated The voltage is approximately 1 kV before the backlight tube is illuminated A red LED on the backlight inverter board illuminates when the output voltage is present When the...

Page 66: ...not present suspect the display card If the signals are present and the backlights are on suspect the flat panel display as the problem Note that CLK A0 A1 A2 and A3 are Low Voltage Differential Sign...

Page 67: ...No Does front panel display work Try a golden display card to verify failure Does display work with golden card Replace LCD Replace display card Replace motherboard Check inverter board control cable...

Page 68: ...presence of high voltage WARNING INJURY CAN RESULT Once the cover is removed the fan blades are exposed both inside and outside the chassis Disconnect the power cable before working around the fans U...

Page 69: ...asure is correct but the unit still has not beeped and started up the motherboard is defective and needs to be replaced 3 If the potential you measure is not correct shut the oscilloscope down and unp...

Page 70: ...before you plug the motherboard cables back into the new backplane assembly measure the resistance to the chassis from the pin 9 contact in the connector that plugs into J1201 If you measure a very l...

Page 71: ...the external keyboard to the rear panel 3 Press Delete as soon as the following prompt appears on the bottom of the screen Press DEL to enter SETUP F12 to select boot device If the prompt does not app...

Page 72: ...ich assembly to replace Test Group Test Name Error Type Assembly to Replace Timebase Timebase Interpolator Test Backplane ADC ADC Register Tests ADC1 ADC2 ADC3 ADC4 Lower acquisition ADC5 ADC6 ADC7 AD...

Page 73: ...e Board Troubleshooting AutoProbe Board Trouble Isolation Inspect the cable between the AutoProbe assembly and the power board Cable OK Replace bad cable No Yes Turn unit on Does unit turn on Replace...

Page 74: ...rd assembly on an antistatic electrical insulated surface 7 Connect the keyboard cable to the scope interface board in the chassis You may need to set the chassis on its side to allow proper routing o...

Page 75: ...able connecting the On Off board to the motherboard If any of the other LEDs are not working on the front panel the first step is to trouble shoot the acquisition assemblies to make sure they are work...

Page 76: ...n Troubleshooting V WKH 7RXFK NH OLW 3UHVV 7RXFK NH RHV WRXFK VFUHHQ ZRUN RQH 1R HV 5HSODFH PRWKHUERDUG 1R 3HUIRUP 7RXFK 6FUHHQ 7HVW LG WHVW SDVV V 86 IURQW WRXFK FDEOH GDPDJHG 1R 1R HV HV 5HSODFH 86...

Page 77: ...Measure the 3 V 3 V 12 V and 12 V voltages with respect to the ground terminal on the front panel located near the Aux Out BNC Do not try to measure voltages at pins 3 through 7 Any failure is likely...

Page 78: ...stem information such as the current software version and installed options This information will be useful when you contact Keysight Technologies To find and save system information follow these step...

Page 79: ...d replacing the touch screen front deck and controller assembly 93 Removing and replacing the motherboard 97 Removing and replacing the acquisition boards backplane assembly 98 Removing the backplane...

Page 80: ...a minimum you must place the oscilloscope on a properly grounded ESD mat and wear a properly grounded ESD wrist strap CAUTION Failure to implement proper antistatic measures may result in damage to th...

Page 81: ...Accessories include all cables Do not include accessories unless they are associated with the failure symptoms 3 Protect the oscilloscope by wrapping it in plastic or heavy paper 4 Pack the oscillosc...

Page 82: ...es and BNC input cables the accessory pouch if it is attached and any other cables including those for a mouse keyboard printer USB and LAN 2 Remove the two Torx T20 screws securing each side handle S...

Page 83: ...20 screws from the rear panel of the oscilloscope then turn the instrument on its side and remove the ten Torx T10 screws from the underside of the oscilloscope that attach the cover to the chassis 5...

Page 84: ...000 A Series Service Guide 5 Replacing Assemblies 6 Once the cover is removed you can remove the top plate by removing the 12 Torx T10 screws from its edges Then pull back on the top plate and lift it...

Page 85: ...ice Guide 85 7 To remove the bottom plate flip the oscilloscope upside down and remove the three Torx T20 screws from the bottom panel Then remove the 3 Torx T20 screws from the bottom edge of the rea...

Page 86: ...ver top plate and bottom plate reverse this procedure Note that all sheet metal holes that are supposed to have screws placed in them are marked by lines on four sides of the hole CAUTION PROPERLY TIG...

Page 87: ...plate as described in the previous section 2 Disconnect front panel cables 3 Grasp and pull on all 13 knobs located on the front panel to remove them 4 Use a screwdriver to disengage the locking tabs...

Page 88: ...88 90000 A Series Service Guide 5 Replacing Assemblies 5 Remove two Torx T10 screws from the front panel assembly...

Page 89: ...long the right side first photo below and two more tabs are on the top and bottom of the left edge following two photos You need to look inside the instrument to see the left side tabs You can see the...

Page 90: ...to the front panel circuit assembly Once the faceplate and assembly have been removed remove the faceplate from the assembly 8 To replace the front panel assembly reverse this procedure Suggestion Wh...

Page 91: ...board 1 Remove the front panel bezel as described earlier 2 Remove the Torx T10 screw from the on off board 3 Pull the board out a little so you can see the cables connected behind it Disconnect these...

Page 92: ...ove two Torx T20 screws that connect the board to the chassis 4 Lift the backlight inverter board out through the top of the chassis 5 To replace the backlight inverter board reverse this procedure WA...

Page 93: ...3 Remove the two Torx T20 screws attaching the touch screen to the front deck of the chassis located along the left side of the screen 4 Disconnect the three cables that are attached to the screen one...

Page 94: ...he chassis remove four Torx T10 screws from the front deck two on the right side and two on the left side 7 Turn the oscilloscope upside down or on its side and look through the bottom cavity to see t...

Page 95: ...front deck if these need to be replaced by removing the Torx T20 screws attached to them To reassemble the front deck and touch screen reverse the above procedure NOTE Before reattaching the front dec...

Page 96: ...ay to prevent glass breakage Inspect the inside surfaces of the touch screen and the flat panel display closely for dust smudges and fingerprints Viewing these with line of sight 45 degrees to the sur...

Page 97: ...motherboard 3 Remove the Torx T10 screws attaching the motherboard to the frame The motherboard shown below is the one in the standard 90000A Series models If you have a performance enhanced model it...

Page 98: ...onnect the power cable and remove the cover top plate and bottom plate 2 Remove the motherboard and bulk 12 V power supply 3 Turn the oscilloscope on its side and remove the SMAs connected to the bott...

Page 99: ...oscilloscope over so it is positioned upright Remove the Torx T20 locking screws from the top underneath where the motherboard used to be 6 Remove the Torx T20 screws from the top of the backplane as...

Page 100: ...90000 A Series Service Guide 5 Replacing Assemblies 8 Remove the Torx T20 screws from lower side of the rear of the instrument 9 Remove the two Torx T20 screws from the underside of the backplane asse...

Page 101: ...blies 5 90000 A Series Service Guide 101 10 If unit is not already upside down flip it upside down now Then lift the entire acquisition boards backplane assembly out of the instrument using the handle...

Page 102: ...section 2 Remove the four Torx T20 screws two per acquisition assembly on the side of the backplane assembly 3 Gently pry on the sheet metal portions to separate the backplane assembly from each of t...

Page 103: ...calibrating and testing performance NOTE Let the oscilloscope warm up before running the calibration The service calibration should be done only after the oscilloscope has run for 30 minutes at ambien...

Page 104: ...r RS 232 port and to the RS 232 port on the oscilloscope b Set the Digital Multimeter as follows c Click Utilities Calibration d Uncheck the Cal Memory Protect box to allow calibration e Click Start t...

Page 105: ...eplacing the hard disk and hard disk control board 1 Disconnect the power cable and remove the cover and top plate 2 Disconnect the two cables connected to the hard disk 3 Remove the two latch screws...

Page 106: ...s 5 To remove the hard disk control board first locate it by looking in the cavity where the hard disk used to be Remove the two Torx T10 screws holding the board to the frame 6 To replace the hard di...

Page 107: ...f each cable The last figure in this section shows the performance enhanced 90000 A Series motherboard so you know where to reconnect the cables The cables are the same on the performance enhanced mod...

Page 108: ...108 90000 A Series Service Guide 5 Replacing Assemblies S A T Aca blebetwe en m otherboarda nd ha rddrive F ront pa ne l U S B ca ble S A T Aca bles between ba ckplanea nd m otherboard...

Page 109: ...Replacing Assemblies 5 90000 A Series Service Guide 109 D ispla yca ble between m otherboarda nd front pa nel P ower harness between ba ckplanea nd m otherboard P ower cab lefor C P Ufa n...

Page 110: ...110 90000 A Series Service Guide 5 Replacing Assemblies P owerharness between backplaneand m otherboard O n O ff ca ble...

Page 111: ...Replacing Assemblies 5 90000 A Series Service Guide 111 Motherboard and cables in performance enhanced 90000 A Series models...

Page 112: ...the bulk 12V power supply 3 Follow the instructions on the label attached to the top of the power supply to remove it WARNING SHOCK HAZARD If the power supply is defective it could have a dangerous c...

Page 113: ...s procedure WARNING AVOID INJURY The fan blades are exposed both inside and outside the chassis Disconnect the power cable before working around the fan Use extreme caution when working with the oscil...

Page 114: ...ble and remove the cover and top plate 2 Unplug the power cable from the 12 V power supply 3 Unscrew the power cord connector from the rear panel Torx T10 screws 4 Remove the ground screw Torx T10 on...

Page 115: ...may not be on your oscilloscope The procedure is exactly the same for both of these ports so only one is shown here 1 Disconnect the power cable and remove the cover and top plate 2 Remove the screw f...

Page 116: ...116 90000 A Series Service Guide 5 Replacing Assemblies...

Page 117: ...arts Ordering Replaceable Parts 118 Exploded Views 119 Replaceable Parts List 123 This chapter describes how to order replaceable assemblies and parts for the Infiniium 90000 A Series oscilloscopes Se...

Page 118: ...direct mail order system There are several advantages to this system Direct ordering and shipping from the Keysight Technologies parts center in California USA No maximum or minimum on any mail order...

Page 119: ...Replaceable Parts 6 90000 A Series Service Guide 119 Exploded Views Front Frame and Front Panel...

Page 120: ...120 90000 A Series Service Guide 6 Replaceable Parts Fan and Acquisition Assembly...

Page 121: ...Replaceable Parts 6 90000 A Series Service Guide 121 Power Supply and PC Motherboard...

Page 122: ...122 90000 A Series Service Guide 6 Replaceable Parts Sleeve and Accessory Pouch...

Page 123: ...Circuit Assembly replaces 54913 66502 A10 54913 69512 1 Backplane Printed Circuit Assembly replaces 54913 69502 A11 54913 66501 2 Acquisition Printed Circuit Assembly 8 GHz and above replaced by 54913...

Page 124: ...90 Win7 based DSO90000 series scopes A20 54932 83501 1 Removable hard drive only Imaged Solid State HDD for M890 Win7 based 90000 Series scopes Service Centers only A20 54932 68717 1 Replacement Remov...

Page 125: ...for knob MP5 54913 94301 1 Control Panel Label MP6 54913 40201 1 Control Panel MP7 54913 41901 1 Control Panel Switch MP9 2090 0960 1 Touch Screen 12 1 in standard models MP9 54916 89801 1 Touch Scre...

Page 126: ...uch standard models 54913 61617 1 Cable USB Touch performance enhanced models 8120 5392 1 Power cord United Kingdom 8120 5393 1 Power cord Australia and New Zealand 8120 5336 1 Power cord Continental...

Page 127: ...erboard 129 Acquisition Assembly 129 Backplane Assembly 130 Front panel 131 Rear panel 132 Display Board 133 On Off Board 133 Main FPGA 133 Power Supply Assembly 134 Monitor Assembly 134Disk Drive 134...

Page 128: ...128 90000 A Series Service Guide 7 Theory of Operation Oscilloscope block diagram...

Page 129: ...rd provides all system control and interface functions for the oscilloscope It contains a CPU ROM and RAM keyboard and mouse interfaces serial and parallel interfaces CDROM hard disk drive interface P...

Page 130: ...through a distribution board from the supply and all voltage are derived from switches and other circuitry Most of these are on the backplane board with some further distribution and generation done...

Page 131: ...al from the BFPGA and an Interrupt line Backplane assembly block diagram Front panel The front panel board combines functions from the main keyboard and the Autoprobe interface board in a single PCA T...

Page 132: ...ock diagram The front panel provides Dedicated knobs and pushbuttons for major oscilloscope functions A 12 1 inch diagonal color flat panel display for waveform measurement and graphical interface dis...

Page 133: ...the monitor On Off Board The On Off board interfaces with the motherboard to provide the on off switch function and the backplane to provide the probe compensation output Power indicator LEDs backlig...

Page 134: ...the oscilloscope Monitor Assembly The Flat Panel Display FPD monitor is a thin film liquid crystal display TFT LCD This FPD is a 12 1 inch diagonal 1024 x 768 pixel XGA color monitor Disk Drive The ha...

Page 135: ......

Page 136: ...This information is subject to change without notice Keysight Technologies 2015 7th edition June 2015 54913 97025 54913 97025 www keysight com...

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