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Keysight Technologies InfiniiVision M9241A Service Manual
Keysight Technologies InfiniiVision M9241A Service Manual

Keysight Technologies InfiniiVision M9241A Service Manual

Pxie oscilloscopes
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Summary of Contents for Keysight Technologies InfiniiVision M9241A

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 3 DFARS 227.7102, the U.S. government Keysight Technologies, Inc. as governed by and may be used or copied only in acquires no greater than Limited Rights as United States and international copyright accordance with the terms of such license.
  • Page 4 In This Service Guide This book provides the service information for the Keysight M9241/42/43A PXIe oscilloscopes. This manual is divided into these chapters: Characteristics and Specifications This chapter contains a partial list of characteristics and specifications for the Keysight InfiniiVision M9241/42/43A PXIe oscilloscopes. Testing Performance This chapter explains how to verify correct oscilloscope operation and perform tests to ensure that the oscilloscope meets the performance specifications.
  • Page 5 Abbreviated instructions for selecting menus and softkeys Instructions for selecting a series of menus and softkey label buttons are written in an abbreviated manner. Instructions for selecting Menu Item1, Menu Item2, then Softkey1 and Softkey2 are abbreviated as follows: Choose Main Menu > Menu Item1 > Menu Item2 > Softkey1 > Softkey2. Softkey label buttons are the six buttons located at the bottom of the Soft Front Panel oscilloscope display.
  • Page 6 Contents In This Service Guide / 3 Figures / 7 Tables / 9 Characteristics and Specifications Measurement Category / 12 Measurement Category / 12 Measurement Category Definitions / 12 Maximum Input Voltage for Analog Inputs / 13 Environmental Conditions / 13 Specifications / 14 Contact Us / 14 Testing Performance...
  • Page 7 Contents Test External Trigger Sensitivity / 38 Keysight M9241/42/43A PXIe Oscilloscopes Performance Test Record / 41 Calibrating and Adjusting User Calibration / 44 To perform User Calibration / 44 User Calibration Status / 45 Troubleshooting Solving General Problems with the Oscilloscope / 48 If there is no trace display / 48 If the trace display is unusual or unexpected / 48 If you cannot see a channel / 49...
  • Page 8 Figures Figure 1. Setting up Equipment for DC Vertical Gain Accuracy Test / 22 Figure 2. Using a Blocking Capacitor to Reduce Noise / 23 Figure 3. Setting up Equipment for Dual Cursor Accuracy Test / 26 Figure 4. Using a Blocking Capacitor to Reduce Noise / 27 Figure 5.
  • Page 9 Figures M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 10 Tables Table 1. List of test equipment / 17 Table 2. Conventions / 18 Table 3. DC Vertical Gain Accuracy Test Limits / 19 Table 4. Equipment Required to Verify DC Vertical Gain Accuracy / 19 Table 5. Settings Used to Verify DC Vertical Gain Accuracy, M9241/42/43A PXIe Models / 20 Table 6.
  • Page 11 Tables M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 12 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 1 Characteristics and Specifications Measurement Category / 12 Environmental Conditions / 13 Specifications / 14 Contact Us / 14 This chapter contains a partial list of characteristics and specifications for the Keysight InfiniiVision M9241/42/43A PXIe oscilloscopes. For a full list of Keysight InfiniiVision M9241/42/43A PXIe oscilloscopes characteristics and specifications see the data sheets.
  • Page 13 Characteristics and Specifications Measurement Category Measurement Category The InfiniiVision M9241/42/43A PXIe oscilloscopes are not intended to be used for measurements in Measurement Category II, III, or IV. Use this instrument only for measurements within its specified measurement category WARNING (not rated for CAT II, III, IV). No transient overvol tages allowed. Measurement Category Definitions The "Not rated for CAT II, III, IV"...
  • Page 14 Characteristics and Specifications Maximum Input Voltage for Analog Inputs Maximum input voltage for analog inputs CAUTION 135 Vrms 50 Ω input: 5 Vrms Input protection is enabled in 50 Ω mode, and the 50 Ω load will disconnect if greater than 5 Vrms is detected. However, the inputs could still be damaged, depending on the time constant of the signal.
  • Page 15 Characteristics and Specifications Specifications Please see the InfiniiVision M9241/42/43A PXIe Oscilloscopes Data Sheet for complete, up-to-date specifications and characteristics. To download a copy of the data sheet please visit: www.keysight.com/products/M9241A. Contact Us To contact Keysight, see: www.keysight.com/find/contactus M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 16 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 2 Testing Performance Overview / 16 List of Test Equipment / 17 To verify DC vertical gain accuracy / 19 To verify dual cursor accuracy / 24 To verify band width (-3 dB) / 28 To verify time base accuracy / 33 To verify trigger sensitivity / 35 Keysight M9241/42/43A PXIe Oscilloscopes Performance Test Record / 41...
  • Page 17 Testing Performance Overview Let the Equipment Warm Up Before Testing For accurate test results, let the test equipment and the oscilloscope warm up 30 minutes before testing. Verifying Test Results During the tests, record the readings in the Performance Test Record on page To verify whether a test passes, verify that the reading is within the limits in the Performance Test Record.
  • Page 18 Testing Performance List of Test Equipment Below is a list of test equipment and accessories required to perform the performance test verification procedures. Table 1 List of test equipment Equipment Critical Specifications Recommended Model/ Part Number Digital Multimeter 0.1 mV resolution, 0.005% accuracy Keysight 34401A/34461A Power Splitter Outputs differ by 0.15 dB...
  • Page 19 Testing Performance Conventions The following conventions will be used when referring to oscilloscope models throughout this chapter. Table 2 Conventions Models Referred to as: M9241A 200 MHz Models M9242A 500 MHz Models M9243A 1 GHz Models M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 20 Testing Performance To verify DC vertical gain accuracy This test verifies the accuracy of the analog channel DC vertical gain for each channel. In this test, you will measure the dc voltage output of a precision source using the oscilloscope’s Average - Full Screen voltage measurement and compare the results with the multimeter reading.
  • Page 21 Testing Performance 3 Set up the oscilloscope. a Adjust the horizontal scale to 200.0 us/d iv. b Set the Volts/Div setting to the value in the first line in Table c Adjust the channel’s vertical position knob to place the baseline (reference level) at 0.5 major division from the bottom of the display.
  • Page 22 Testing Performance 4 Add a measurement for the average voltage: a Choose Main Menu > Measure > Measurements. b In the Measurement Menu, click Add Meas. c In the Add Measurements Menu, click Source; then, select the channel you are testing. d Click Type:;...
  • Page 23 Testing Performance Precision Source Oscilloscope BNC Tee Digital Multimeter BNC (f) to dual bananna adapter Figure 1 Setting up Equipment for DC Vertical Gain Accuracy Test 7 Adjust the output so that the multimeter reading displays the first Volts/div precision source setting value in Table 8 Disconnect the multimeter.
  • Page 24 Testing Performance The difference in average voltage readings should be within the test limits of Table If a result is not within the test limits, go to the “Troubleshooting” chapter. Then return here. 12 Disconnect the precision source from the oscilloscope. 13 Repeat this procedure to check the DC vertical gain accuracy with the remaining Volts/div setting values in Table...
  • Page 25 Testing Performance To verify dual cursor accuracy This test verifies the dual cursor accuracy for each analog channel. This test is similar to the test for verifying the DC vertical gain, except you will measure the dc voltage output of a precision source using dual cursors on the oscilloscope and compare the results with the multimeter reading.
  • Page 26 Testing Performance Table 7 Settings Used to Verify Dual Cursor Accuracy, M9241/42/43A PXIe Models Vol ts/Div Setting Precision Source Setting Test Limits 5 V/Div 35 V 34.032 V 35.968 V 2 V/Div 14 V 13.613 V 14.387 V 1 V/Div 6.806 V 7.194 V 500 mV/Div...
  • Page 27 Testing Performance Note: Set the Low Force terminal of the Precision Source to its "Floating" state to prevent offset error caused by ground loop current from the Precision Source ground to the DUT ground. Precision Source Oscilloscope BNC Tee Digital Multimeter BNC (f) to dual bananna adapter...
  • Page 28 Testing Performance 10 Wait until the measurement settles. 11 Drag the Y2 cursor to the center of the voltage trace. The ΔY value on the lower line of the display should be within the test limits of Table If a result is not within the test limits, go to the “Troubleshooting” chapter. Then return here.
  • Page 29 Testing Performance To verify bandwidth (-3 dB) This test checks the bandwidth (-3 dB) of the oscilloscope. In this test you will use a signal generator and a power meter. Table 8 Band width (-3 dB) Test Limits Models Test Limits 1 GHz Models All channels (-3 dB), dc to 1 GHz 500 MHz Models...
  • Page 30 Testing Performance Oscilloscope Signal Generator N to BNC Adapter Power Splitter Power Sensor N Cable Power Meter Figure 5 Setting Up Equipment for Band width (-3 dB) Verification Test 2 Set up the power meter. Set the power meter to display measurements in units of watts. M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 31 Testing Performance 3 Set up the oscilloscope. a Choose Main Menu > Defaul t Setup. b Set channel 1 Coupling to DC. c Set channel 1 Impedance to 50 Ohm. d Set the time base to 500 ns/div. e Set the Volts/Div for channel 1 to 200 mV/div. f Choose Main Menu >...
  • Page 32 Testing Performance 9 Change the signal generator output frequency according to the maximum frequency for the oscilloscope using the following: • 1 GHz Models: 1 GHz • 500 MHz Models: 500 MHz • 200 MHz Models: 200 MHz 10 Referencing the frequency from step 9, set the power meter Cal Factor % to the frequency value on the calibration chart on the power sensor.
  • Page 33 Testing Performance 17 Turn off the current channel and turn on the next channel using the channel keys. 18 Repeat steps 3 through 17 for the remaining channels, setting the parameters of the channel being tested where appropriate. M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 34 Testing Performance To verify time base accuracy This test verifies the accuracy of the time base. In this test you will measure the absolute error of the time base oscillator and compare the results to the specification. Table 10 Equipment Required to Verify Time Base Accuracy Equipment Critical Specifications Recommended Model/Part...
  • Page 35 Testing Performance 4 Make the measurement. a Set oscilloscope horizontal sweep speed control to 1 ms/div. b Set horizontal position control to +1 ms. c Set the oscilloscope horizontal sweep speed control to 5 ns/div. d Measure the number of nanoseconds from where the rising edge crosses the center horizontal grid line to the center vertical grid line.
  • Page 36 Testing Performance To verify trigger sensitivity This test verifies the trigger sensitivity. In this test, you will apply a sine wave to the oscilloscope at the upper bandwidth limit. You will then decrease the amplitude of the signal to the specified levels, and check to see if the oscilloscope is still triggered.
  • Page 37 Testing Performance Test Internal Trigger Sensitivity (all models) 1 Choose Main Menu > Defaul t Setup. 2 Choose Main Menu > Trigger > Trigger Mode and Coupling Menu. 3 In the Trigger Mode and Coupling Menu, click the Mode softkey to select Normal. 4 Connect the equipment (see Figure a Connect the signal generator output to the oscilloscope channel 1 input.
  • Page 38 Testing Performance 6 Perform these steps to test at the 5 mV/div setting: a Set the signal generator amplitude to about 10 mV b Choose Main Menu > Autoscale. c Set the time base to 10 ns/div. d Set channel 1 to 5 mV/div. e Decrease the amplitude from the signal generator until 1 vertical division of the signal (about 5 mV ) is displayed.
  • Page 39 Testing Performance Test External Trigger Sensitivity This test applies to all models. Verify the external trigger sensitivity at these settings: • 100 MHz, 200 mV • 200 MHz, 350 mV 1 Connect the equipment (see Figure a Use the N cable to connect the signal generator to the power splitter input. b Connect one output of the power splitter to the Aux Trig input through a 50Ω...
  • Page 40 Testing Performance Oscilloscope Signal Generator MMCX to BNC Cable 50 Ohm Feedthrough N to BNC Adapter Power Splitter Power Sensor N Cable Power Meter Figure 7 Setting Up Equipment for External Trigger Sensitivity Test M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 41 Testing Performance 2 Set up the oscilloscope: a Choose Main Menu > Defaul t Setup. b Choose Main Menu > Trigger > Trigger Mode and Coupling Menu. c In the Trigger Mode and Coupling Menu, click the Mode softkey to select Normal.
  • Page 42 Testing Performance Keysight M9241/42/43A PXIe Oscilloscopes Performance Test Record Serial No. ______________________________________ Test by _____________________________ Test Interval ____________________________________ Work Order No. ______________________ Recommended Next Testing ________________________ Temperature ____________ DC Vertical Gain Accuracy Range Power Supply Setting Test Limits Channel 1 Channel 2 5 V/Div 35 V 34.2 V to 35.8 V...
  • Page 43 Testing Performance Dual Cursor Accuracy Range Power Supply Setting Test Limits Channel 1 Channel 2 5 V/Div 35 V 34.032 V to 35.968 V ________ ________ 2 V/Div 14 V 13.613 V to 14.387 V ________ ________ 1 V/Div 6.806 V to 7.194 V ________ ________ 500 mV/Div...
  • Page 44 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 3 Calibrating and Adjusting This chapter explains how to adjust the oscilloscope for optimum operating performance.
  • Page 45 Calibrating and Adjusting User Calibration Perform user-calibration: • Every two years or after 4000 hours of operation. • If the ambient temperature is >10° C from the calibration temperature. • If you want to maximize the measurement accuracy. The amount of use, environmental conditions, and experience with other instruments help determine if you need shorter User Cal intervals.
  • Page 46 Calibrating and Adjusting User Calibration Status Clicking the User Calibration Status softkey displays the following summary results of the previous User Cal, and the status of probe calibrations for probes that can be calibrated. Note that AutoProbes do not need to be calibrated, but InfiniiMax probes can be calibrated.
  • Page 47 Calibrating and Adjusting M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 48 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 4 Troubleshooting Solving General Problems with the Oscilloscope / 48 Verifying Basic Operation / 50 This chapter begins with “Solving General Problems with the Oscilloscope. It tells you what to do in these cases: •...
  • Page 49 Check that the circuit under test is powered on. Choose Main Menu > Autoscale. Obtain service from Keysight Technologies, if necessary. If the trace display is unusual or unexpected Check that the Horizontal time/division setting is correct for the expected frequency range of the input signals.
  • Page 50 Troubleshooting Check that persistence in the Display menu is turned off, then click the Clear Display softkey. Choose Main Menu > Autoscale. If you cannot see a channel Recall the default setup by choosing Main Menu > Defaul t Setup. This will ensure that the trigger mode is Auto.
  • Page 51 Troubleshooting Verifying Basic Operation To perform hardware self test 1 Keysight InfiniiVision M924xA SFP interface, click the top left blue menu icon, and choose Utilities > Service Menu. 2 In the Service Menu, click Hard ware Sel f Test. Hardware Self Test performs a series of internal procedures to verify that the oscilloscope is operating properly.
  • Page 52 Troubleshooting • dc coupling. • 0 V position. • probe factor to 1.0 if an AutoProbe probe is not connected to the channel. • Trigger: • Edge trigger. • Auto sweep mode. • 0 V level. • channel 1 source. •...
  • Page 53 Troubleshooting Figure 8 Default setup screen M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 54 Troubleshooting To perform an Autoscale on the Probe Comp signal 1 Choose Main Menu > Defaul t Setup. The oscilloscope is now configured to its default settings. 2 Connect an oscilloscope probe from channel 1 to the Probe Comp signal terminal on the front panel.
  • Page 55 Troubleshooting To compensate passive probes You should compensate your passive probes to match their characteristics to the oscilloscope’s channels. A poorly compensated probe can introduce measurement errors. 1 Perform the procedure “To perform an Autoscale on the Probe Comp signal" on page 53 2 Click the channel button to which the probe is connected (color-coded 1, 2, etc.
  • Page 56 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 5 Replacing Assemblies The service policy for Keysight M9241/42/43A PXIe oscilloscopes is unit replacement, so there are no instructions for replacing internal assemblies in this service guide.
  • Page 57 Replacing Assemblies M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 58 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 6 Replaceable Parts Because the service policy for the Keysight M9241/42/43A PXIe oscilloscopes is unit replacement, no replaceable parts are available.
  • Page 59 Replaceable Parts M9241/42/43A PXIe Oscilloscopes Service Guide...
  • Page 60 Keysight InfiniiVision M9241/42/43A PXIe Oscilloscope Service Guide 7 Safety Notices This apparatus has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for Measuring Apparatus, and has been supplied in a safe condition. This is a Safety Class I instrument (provided with terminal for protective earthing).
  • Page 61 Safety Notices Do not install substitute parts or perform any unauthorized modification to the instrument. Capacitors inside the instrument may retain a charge even if the instrument is disconnected from its source of supply. Do not operate the instrument in the presence of flammable gasses or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard.
  • Page 62 Index contact information, equipment, record, accuracy, DC vertical gain, trace display accuracy, dual cursor, problem solving, assemblies maximum input voltage for analog trigger replacing, inputs, sensitivity, measurement category, sensitivity, external, definitions, sensitivity, internal, troubleshooting, bandwidth verification, NIST, user calibration, calibration, certificate of calibration, perform user cal, channels...
  • Page 63 Index M9241/42/43A PXIe Oscilloscopes Service Guide...

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