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Keysight InfiniiVision DSOX1204A, Service Manual

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32

DSOX1204A/G Oscilloscopes Service Guide 

2

Testing Performance

 

Figure 4

Setting Up Equipment for Internal Trigger Sensitivity Test

4

Set the output frequency of the signal generator to 10 MHz.

5

Perform these steps to test at the 10 MHz setting:

a

Set the signal generator amplitude to about 20 mV

pp

.

b

Press the 

[AutoScale]

 key.

c

Set the time base to 10 ns/div.

d

Set channel 1 to 10 mV/div.

e

Decrease the amplitude from the signal generator until 0.6 vertical divisions 

of the signal (about 6 mV

pp

) is displayed.

50 Ohm Feedthrough

Signal
Generator

Oscilloscope

N Cable

N to BNC Adapter

Summary of Contents for InfiniiVision DSOX1204A

Page 1: ...Keysight InfiniiVision DSOX1204A G Oscilloscopes Service Guide ...

Page 2: ...ustomers under its standard commercial license which is embodied in its End User License Agreement EULA a copy of which can be found at www keysight com find sweula The license set forth in the EULA represents the exclusive authority by which the U S government may use modify distribute or disclose the Software The EULA and the license set forth therein does not require or permit among other thing...

Page 3: ...s 3 Calibrating and Adjusting This chapter explains how to adjust the oscilloscope for optimum operating performance 4 Troubleshooting This chapter begins with suggestions for solving general problems that you may encounter with the oscilloscope Procedures for troubleshooting the oscilloscope follow the problem solving suggestions 5 Replacing Assemblies The service policy for DSOX1204A G oscillosc...

Page 4: ...ions for pressing a series of keys are written in an abbreviated manner Instructions for pressing Key1 then pressing Softkey2 then pressing Softkey3 are abbreviated as follows Press Key1 Softkey2 Softkey3 The keys may be front panel keys or softkeys which are located directly below the oscilloscope display ...

Page 5: ...rement Category 12 Measurement Category Definitions 12 Maximum Input Voltages 13 Environmental Conditions 13 Specifications 14 Contact Us 14 2 Testing Performance Overview 16 List of Test Equipment 17 Conventions 18 To verify DC vertical gain accuracy 19 To verify bandwidth 3 dB 24 To verify time base accuracy 28 To verify trigger sensitivity 30 Test Internal Trigger Sensitivity 31 ...

Page 6: ...display 40 If there is no trace display 40 If the trace display is unusual or unexpected 40 If you cannot see a channel 41 Verifying Basic Operation 42 To power on the oscilloscope 42 To perform hardware self test 42 To perform front panel self test 43 To verify default setup 43 To perform an Auto Scale on the Probe Comp signal 45 To compensate passive probes 46 5 Replacing Assemblies 6 Replaceabl...

Page 7: ... Vertical Gain Accuracy Test 22 Figure 2 Using a Blocking Capacitor to Reduce Noise 23 Figure 3 Setting Up Equipment for Bandwidth 3 dB Verification Test 25 Figure 4 Setting Up Equipment for Internal Trigger Sensitivity Test 32 Figure 5 Default setup screen 44 Figure 6 Example pulses 46 ...

Page 8: ...8 DSOX1204A G Oscilloscopes Service Guide Figures ...

Page 9: ...Vertical Gain Accuracy 19 Table 5 Settings Used to Verify DC Vertical Gain Accuracy 20 Table 6 Bandwidth 3 dB Test Limits 24 Table 7 Equipment Required to Verify Bandwidth 3 dB 24 Table 8 Time Base Accuracy Test Limits 28 Table 9 Equipment Required to Verify Time Base Accuracy 28 Table 10 Equipment Required to Verify Trigger Sensitivity 30 Table 11 Internal Trigger Sensitivity Specifications 31 ...

Page 10: ...10 DSOX1204A G Oscilloscopes Service Guide Tables ...

Page 11: ...This chapter contains a partial list of characteristics and specifications for the Keysight InfiniiVision DSOX1204A G oscilloscopes For a full list of Keysight InfiniiVision DSOX1204A G oscilloscopes characteristics and specifications see the data sheets The data sheets are available at www keysight com products DSOX1204G Power Requirements Line voltage frequency and power Line 100 120 Vac 50 60 4...

Page 12: ...erformed on circuits directly connected to the low voltage installation Examples are measurements on household appliances portable tools and similar equipment Measurement category III is for measurements performed in the building installation Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets in the fixed instal...

Page 13: ...tended to be powered by MAINS that comply to Overvoltage Category II which is typical of cord and plug connected equipment Pollution Degree The InfiniiVision DSOX1204A G oscilloscopes may be operated in environments of Pollution Degree 2 or Pollution Degree 1 Pollution Degree Definitions Pollution Degree 1 No pollution or only dry non conductive pollution occurs The pollution has no influence Exam...

Page 14: ...up to date specifications and characteristics To download a copy of the data sheet please visit www keysight com products DSOX1204G Or go to the Keysight home page at www keysight com and search for DSOX1204A G oscilloscopes data sheet To order a data sheet by phone please contact your local Keysight office Contact Us To contact Keysight see www keysight com find contactus ...

Page 15: ...DC vertical gain accuracy 19 To verify bandwidth 3 dB 24 To verify time base accuracy 28 To verify trigger sensitivity 30 Keysight DSOX1204A G Oscilloscopes Performance Test Record 34 This chapter explains how to verify correct oscilloscope operation and perform tests to ensure that the oscilloscope meets the performance specifications ...

Page 16: ...inutes before testing Verifying Test Results During the tests record the readings in the Performance Test Record on page 34 To verify whether a test passes verify that the reading is within the limits in the Performance Test Record If a performance test fails If a performance test fails first perform the User Cal procedure Press the following keys to access User Cal Utility Service Start User Cal ...

Page 17: ...r Sensor 1 GHz 3 accuracy Keysight E9304A or N8482A BNC banana cable BNC m to dual banana Pomona 2BC BNC 36 or Keysight 11001 66001 BNC cable qty 3 BNC BNC 48 length Keysight 10503A Cable Type N m 609 6 mm 24 in Keysight 11500B Adapter BNC f to banana m Keysight 1251 2277 Adapter BNC Tee m f f Keysight 1250 0781 or Pomona 3285 Adapter Type N m to BNC m Keysight 1250 0082 or Pomona 3288 with Pomona...

Page 18: ... be used when referring to oscilloscope models throughout this chapter Table 2 Conventions Models Referred to as DSOX1204A DSOX1204G 70 MHz Models DSOX1204A DSOX1204G with D1200BW1A upgrade 100 MHz Models DSOX1204A DSOX1204G with D1200BW2A upgrade from 70 MHz or D1200BW3A upgrade from 100 MHz 200 MHz Models ...

Page 19: ...e then turn the Entry knob to select 1 00 1 Table 3 DC Vertical Gain Accuracy Test Limits Test Limits Notes 3 of full scale 10 mV div 4 of full scale 10 mV div Full scale is defined as 8 mV on the 500 uV div range Full scale on all other ranges is defined as 8 divisions times the V div setting Table 4 Equipment Required to Verify DC Vertical Gain Accuracy Equipment Critical Specifications Recommen...

Page 20: ... 5 V Div 35 V 33 8 V to 36 2 V 2 V Div 14 V 13 52 V to 14 48 V 1 V Div 7 V 6 76 V to 7 24 V 500 mV Div 3 5 V 3 38 V to 3 62 V 200 mV Div 1 4 V 1 352 V to 1 448 V 100 mV Div 700 mV 676 mV to 724 mV 50 mV Div 350 mV 338 mV to 362 mV 20 mV Div 140 mV 135 2 mV to 144 8 mV 10 mV Div 70 mV 67 6 mV to 72 4 mV 5 mV Div1 35 mV 33 4 mV to 36 6 mV 2 mV Div1 14 mV 13 36 mV to 14 64 mV 1 mV Div1 7 mV 6 68 mV t...

Page 21: ...dd a measurement for the average voltage a Press the Meas key b Press Source then turn the Entry knob labeled on the front panel to select the channel you are testing c Press Type then turn the Entry knob to select Average Full Screen and press Add Measurement 5 Read the current average voltage value as V1 6 Use the BNC tee and cables to connect the oscilloscope calibrator power supply to both the...

Page 22: ...e output so that the multimeter reading displays as close as possible the first Volts div calibrator setting value in Table 5 8 Wait until the measurement settles 9 Read the current average voltage value again as V2 10 Calculate the difference V2 V1 Oscilloscope Oscilloscope Calibrator Digital Multimeter BNC Tee BNC f to dual bananna adapter ...

Page 23: ...nally repeat this procedure for the remaining channels to be tested Use a Blocking Capacitor to Reduce Noise On the more sensitive ranges such as 0 5 mV div 1 mV div 2 mV div and 5 mV div noise may be a factor To eliminate the noise add a BNC Tee blocking capacitor and shorting cap at the oscilloscope channel input to shunt the noise to ground See Figure 2 If a BNC capacitor is not available use a...

Page 24: ...oscope input BNC Table 6 Bandwidth 3 dB Test Limits Models Test Limits 200 MHz Models All channels 3 dB dc to 200 MHz 100 MHz Models All channels 3 dB dc to 100 MHz 70 MHz Models All channels 3 dB dc to 70 MHz Table 7 Equipment Required to Verify Bandwidth 3 dB Equipment Critical Specifications Recommended Model Part Signal Generator 100 kHz 200 MHz at 200 mVrms Keysight N5181A Power Meter 1 MHz 2...

Page 25: ...Figure 3 Setting Up Equipment for Bandwidth 3 dB Verification Test 2 Set up the power meter Set the power meter to display measurements in units of watts Power Splitter Power Sensor Signal Generator Oscilloscope Power Meter N Cable N to BNC Adapter 50 Ohm Feedthrough ...

Page 26: ...nd use the Entry knob to select AC RMS N Cycles within the select menu d Press the Add Measurement softkey 6 Note the oscilloscope AC RMS Cyc 1 reading at the bottom of the screen This is the RMS value with any dc offset removed 7 Set the power meter Cal Factor to the 1 MHz value on the calibration chart on the power sensor 8 Note the reading on the power meter and covert to Vrms using the express...

Page 27: ...ev n max freq 161 6 mV Then after converting the values from the power meter to Vrms 15 The result from step 14 should be between 3 0 dB and 3 0 dB Record the result in the Performance Test Record see page 34 16 Move the power splitter from the channel 1 to the channel 2 input 17 Turn off the current channel and turn on channel 2 using the channel keys 18 Set the trigger source to channel 2 19 Rep...

Page 28: ...utput of the signal generator to oscilloscope channel 1 using the BNC cable Also connect a 50 ohm feedthrough termination between the channel 1 input and the BNC cable Table 8 Time Base Accuracy Test Limits Models Test Limits All Models 50 ppm 5 ppm per year aging Table 9 Equipment Required to Verify Time Base Accuracy Equipment Critical Specifications Recommended Model Part Signal Generator 100 k...

Page 29: ...anoseconds from where the rising edge crosses the center horizontal grid line to the center vertical grid line The number of nanoseconds is equivalent to the time base error in ppm e Derive the date code from the oscilloscope s serial number to calculate the number of years since manufacture Include any fractional portion of a year i First get the 3rd to 6th digits of the serial number For example...

Page 30: ...he signal to a specified level and check to see if the oscilloscope still triggers Table 10 Equipment Required to Verify Trigger Sensitivity Equipment Critical Specifications Recommended Model Part Signal Generator 10 MHz and 70 MHz 100 MHz or 200 MHz sine waves Keysight N5181A Power splitter Outputs differ 0 15 dB Keysight 11667A Power Meter Keysight N1914A Power Sensor Keysight E9304A or N8482A ...

Page 31: ...ee Figure 4 a Connect the signal generator output to the oscilloscope channel 1 input b Connect a 50 ohm feedthrough termination between the channel 1 input and the BNC cable Table 11 Internal Trigger Sensitivity Specifications Oscilloscope Models Internal Trigger Sensitivity Specification Bandwidth 10 MHz Maximum Bandwidth 70 MHz greater of 0 6 div or 2 5 mV greater of 0 9 div or 3 8 mV 100 MHz g...

Page 32: ...MHz 5 Perform these steps to test at the 10 MHz setting a Set the signal generator amplitude to about 20 mVpp b Press the AutoScale key c Set the time base to 10 ns div d Set channel 1 to 10 mV div e Decrease the amplitude from the signal generator until 0 6 vertical divisions of the signal about 6 mVpp is displayed 50 Ohm Feedthrough Signal Generator Oscilloscope N Cable N to BNC Adapter ...

Page 33: ...signal generator amplitude to about 20 mVpp b Press the AutoScale key c Set the time base to 10 ns div d Set channel 1 to 10 mV div e Decrease the amplitude from the signal generator as described in the following table according to your oscilloscope s maximum bandwidth The trigger is stable when the displayed waveform is stable If the trigger is not stable try adjusting the trigger level If adjust...

Page 34: ...48 V ________ ________ ________ ________ 100 mV Div 700 mV 676 mV to 724 mV ________ ________ ________ ________ 50 mV Div 350 mV 338 mV to 362 mV ________ ________ ________ ________ 20 mV Div 140 mV 135 2 mV to 144 8 mV ________ ________ ________ ________ 10 mV Div 70 mV 67 6 mV to 72 4 mV ________ ________ ________ ________ 5 mV Div 35 mV 33 4 mV to 36 6 mV ________ ________ ________ ________ 2 m...

Page 35: ...div or 2 5 mV ________ ________ ________ ________ Max BW 200 MHz 1 2 div or 5 mV ________ ________ ________ ________ 100 MHz models 10 MHz 0 6 div or 2 5 mV ________ ________ ________ ________ Max BW 100 MHz 1 2 div or 5 mV ________ ________ ________ ________ 70 MHz models 10 MHz 0 6 div or 2 5 mV ________ ________ ________ ________ Max BW 70 MHz 0 9 div or 3 8 mV ________ ________ ________ ______...

Page 36: ...36 DSOX1204A G Oscilloscopes Service Guide 2 Testing Performance ...

Page 37: ...commendations Every five years or after 10000 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 adjustment intervals Let the Equipment Warm Up Before Adjusting Before you start the adjustments let t...

Page 38: ...e your Certificate of Calibration If NIST National Institute of Standards and Technology traceability is required perform the procedures in Chapter 2 in this book using traceable sources To perform User Cal 1 Disconnect all inputs from the front panel and allow the oscilloscope to warm up before performing this procedure 2 Make sure user calibration protection is not on by pressing the Utility Opt...

Page 39: ... see a channel Next this chapter describes procedures for Verifying Basic Operation of the oscilloscope To power on the oscilloscope To perform hardware self test To perform front panel self test To verify default setup To perform an Auto Scale on the Probe Comp signal To compensate passive probes The service policy for all DSOX1204A G oscilloscopes is unit replacement so there are no internal ass...

Page 40: ... by pressing Default Setup This will ensure that the trigger mode is Auto Check that the probe clips are securely connected to points in the circuit under test and that the ground is connected Check that the circuit under test is powered on Press the Auto Scale key Obtain service from Keysight Technologies if necessary If the trace display is unusual or unexpected Check that the Horizontal time di...

Page 41: ...see a channel Recall the default setup by pressing Default Setup This will ensure that the trigger mode is Auto Check that the oscilloscope probe s BNC connector is securely attached to the oscilloscope s input connector Check that the probe clips are securely connected to points in the circuit under test Check that the circuit under test is powered on You may have pressed the Auto Scale key befor...

Page 42: ...pe At this time you can press any key to remove the message and view the display Or you can wait and the message will automatically disappear It will take a total of about 20 30 seconds for the oscilloscope to go through its basic self test and power up routine 2 Proceed to To perform hardware self test on page 42 To perform hardware self test Pressing Utility Service Hardware Self Test performs a...

Page 43: ...e on screen instructions Failures in the front panel self test indicate problems with the keyboard keypad or display To verify default setup The oscilloscope is designed to turn on with the setup from the last turn on or previous setup To recall the default setup 1 Press the Default Setup key This returns the oscilloscope to its default settings and places the oscilloscope in a known operating con...

Page 44: ...hannel 1 source dc coupling rising edge slope 60 ns holdoff time Display 20 grid intensity persistence off Other Acquire mode normal Run Stop to Run cursor measurements off Figure 5 Default setup screen 2 If your screen looks substantially different replace the system board ...

Page 45: ...d to the ground terminal that is next to the Demo 2 Probe Comp terminal 4 Press AutoScale 5 You should see a waveform on the oscilloscope s display similar to this If you see the waveform but the square wave is not shaped correctly as shown above perform the procedure To compensate passive probes on page 46 If you do not see the waveform ensure your power source is adequate the oscilloscope is pro...

Page 46: ...be Check then follow the instructions on screen If necessary use a nonmetallic tool supplied with the probe to adjust the trimmer capacitor on the probe for the flattest pulse possible On the some probes the trimmer capacitor is the yellow adjustment on the probe tip On other probes the trimmer capacitor is located on the probe BNC connector Figure 6 Example pulses 5 Connect probes to all other os...

Page 47: ...ion DSOX1204A G Oscilloscope Service Guide 5 Replacing Assemblies The service policy for all DSOX1204A G oscilloscopes is unit replacement so there are no instructions for replacing internal assemblies in this service guide ...

Page 48: ...48 DSOX1204A G Oscilloscopes Service Guide 5 Replacing Assemblies ...

Page 49: ...Vision DSOX1204A G Oscilloscope Service Guide 6 Replaceable Parts Because the service policy for DSOX1204A G oscilloscopes is unit replacement no replaceable parts are available for the Keysight DSOX1204A G oscilloscopes ...

Page 50: ...50 DSOX1204A G Oscilloscopes Service Guide 6 Replaceable Parts ...

Page 51: ... 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 Before applying power verify that the correct safety precautions are taken see the following warnings In addition note the external markings on the instrument that are described under Safety Symbols ...

Page 52: ... voltage reduction or mains isolation the common terminal must be connected to the earth terminal of the power source Whenever it is likely that the ground protection is impaired you must make the instrument inoperative and secure it against any unintended operation Service instructions are for trained service personnel To avoid dangerous electric shock do not perform any service unless qualified ...

Page 53: ...nt If the instrument requires cleaning 1 Remove power from the instrument 2 Clean the external surfaces of the instrument with a soft cloth dampened with a mixture of mild detergent and water 3 Make sure that the instrument is completely dry before reconnecting it to a power source ...

Page 54: ...ction manual symbol the product is marked with this symbol when it is necessary for you to refer to the instruction manual in order to protect against damage to the product Hazardous voltage symbol Earth terminal symbol Used to indicate a circuit common connected to grounded chassis ...

Page 55: ... startup sequence 42 M measurement category 12 definitions 12 N NIST 38 O overvoltage category 13 P perform user cal 38 performance test record 34 pollution degree 13 pollution degree definitions 13 power requirements 11 probes compensating 46 problem solving 39 R record tests 34 replacing assemblies 47 run self tests 42 S self test front panel 43 self test hardware 42 self alignment user cal 38 s...

Page 56: ...56 DSOX1204A G Oscilloscopes Service Guide Index ...

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