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Calibration Procedures

1

Keysight U1241C/U1242C Service Guide

49

Figure 1-9

Vsense (non-contact voltage) calibration

After appearing briefly

Pass

Fail

Press

to start calibration.

Hold

Log

After appearing briefly

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Summary of Contents for U1241C

Page 1: ...Keysight U1241C U1242C Handheld Digital Multimeter Service Guide ...

Page 2: ...hts customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursu a...

Page 3: ...be taken to maintain safe operation of the instrument Caution risk of danger refer to this manual for specific Warning or Caution information Earth ground terminal Equipment protected throughout by double insulation or reinforced insulation CAT III 1000 V Category III 1000 V overvoltage protection CAT IV 600 V Category IV 600 V overvoltage protection ...

Page 4: ... particular attention to the insulation surrounding the connectors Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads before you use the multimeter Do not operate the multimeter around explosive gas vapor or wet environments Do not apply more than the rated voltage as marked on the multimeter between terminals or between te...

Page 5: ...on as the low battery indicator appears and flashes Comply with local and national safety requirements when working in hazardous areas and use proper protection equipment CAUTION Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance Use the proper terminals function and range for your measurements This multimeter is for use at...

Page 6: ...tools and similar equipment Measurement CAT III 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 installation and equipment for industrial use and some other equipment including stationary motors with permanent connection to the fixed installatio...

Page 7: ...le below shows the general environmental requirements for this instrument Environmental condition Requirement Temperature Operating condition 20 C to 55 C 0 to 80 RH Storage condition 40 C to 70 C 0 to 80 RH without batteries Humidity Up to 80 RH for temperature of up to 30 C decreasing linearly to 50 RH at 55 C Altitude Up to 3000 m Pollution degree 2 ...

Page 8: ...ng safety and Electromagnetic Compatibility EMC compliances Safety compliance IEC EN 61010 1 IEC EN 61010 2 033 Canada CAN CSA C22 2 No 61010 1 CAN CSA C22 2 No 61010 033 USA ANSI UL Std No 61010 1 ANSI UL Std No 61010 033 EMC compliance IEC 61326 1 EN 61326 1 Canada ICES NMB 001 Australia New Zealand AS NZS CISPR 11 ...

Page 9: ...registered trademark of the Australian Communications and Media Authority This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or d...

Page 10: ...d Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Center or visit http about keysight com en companyinfo environment takeback shtml for more information Sales and Technical Support To contact Keysight for sales and technical support refer to the support links o...

Page 11: ... Calibration Procedures Calibration Overview 18 Closed case calibration 18 Keysight calibration services 18 Calibration interval 18 Recommended adjustment 19 Recommended Test Equipment 20 Basic Operating Tests 21 Backlight test 21 Display test 21 Input warning test A terminal 22 Input warning test terminal 23 Calibration Process 24 Test Considerations 24 Performance Verification Tests 25 Calibrati...

Page 12: ...adjustment input values 44 Vsense non contact voltage calibration 47 Adjustment procedure 50 Exiting the adjustment mode 51 Calibration Count 52 Calibration Error Codes 54 2 Service and Maintenance Troubleshooting 56 Fuse Replacement 57 Returning the Multimeter for Service 59 Replaceable Parts 60 To order replaceable parts 60 Types of Service Available 61 Extended service contracts 61 Obtaining Re...

Page 13: ... μAEr for wrong terminal input 23 Figure 1 4 Calibration security code 35 Figure 1 5 Unsecuring the multimeter 37 Figure 1 6 Changing the calibration security code 39 Figure 1 7 Resetting the calibration security code to its factory default 41 Figure 1 8 Rotary switch 43 Figure 1 9 Vsense non contact voltage calibration 49 Figure 1 10 Calibration count mode 53 ...

Page 14: ...14 Keysight U1241C U1242C Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 15: ...ests 29 Table 1 7 AC current A true rms performance verification tests 30 Table 1 8 AC current A averaging sense performance verification tests 31 Table 1 9 Diode performance verification test 31 Table 1 10 Capacitance performance verification tests 32 Table 1 11 Resistance performance verification tests 32 Table 1 12 Frequency performance verification tests 33 Table 1 13 Temperature performance v...

Page 16: ...16 Keysight U1241C U1242C Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 17: ...erating Tests 21 Calibration Process 24 Test Considerations 24 Performance Verification Tests 25 Calibration Security 34 Unsecuring the Multimeter for Calibration 35 Using the Front Panel for Adjustments 42 Calibration Count 52 Calibration Error Codes 54 This chapter helps you to verify the multimeter s performance and to make adjustments where necessary ...

Page 18: ...he new correction factors are stored in the nonvolatile memory until the next calibration adjustment is performed The nonvolatile EEPROM calibration memory is retained even when power is switched off Keysight calibration services When your multimeter is due for calibration contact your local Keysight Service Center to enquire about recalibration services Calibration interval A 1 year interval is a...

Page 19: ...rmance This will ensure that the multimeter will remain within the specifications for the next calibration interval This criterion for the re adjustment provides the best long term stability Performance data are measured during the Performance Verification Tests on page 25 but this does not guarantee that the multimeter will remain within these limits unless the adjustments are performed See Calib...

Page 20: ...0A 5522A 20 of the instrument s 1 year specifications AC true rms voltage Fluke 5520A 5522A 20 of the instrument s 1 year specifications AC averaging sense voltage Fluke 5520A 5522A 20 of the instrument s 1 year specifications DC current Fluke 5520A 5522A 20 of the instrument s 1 year specifications AC true rms current Fluke 5520A 5522A 20 of the instrument s 1 year specifications AC average curre...

Page 21: ...of the multimeter Repair is required if the multimeter fails the basic operating tests Backlight test Press to test the backlight It will momentarily toggle the backlight on and off Display test Press and turn on the multimeter to view all annunciators of the display Compare the display with the example in Figure 1 1 Figure 1 1 Display screen Hold Log ...

Page 22: ...but the rotary switch is not set to the corresponding position The secondary display will show until the test lead is removed from the input terminal or until the rotary switch is set to the position Figure 1 2 Example of A Er for wrong terminal input 2 1 Vsense 1 U1242C True RMS Multimeter mA A COM V A V V mA ZLOW Hz Range Shift Hold Esc Vsense MaxMin Auto Log View 2 600V CAT III 1000V CAT IV MAX...

Page 23: ...g function The secondary display will show until the test lead is removed from the input terminal or until the rotary switch is set to the position Figure 1 3 Example of μAEr for wrong terminal input mA mA 2 1 Vsense 1 U1242C True RMS Multimeter mA A COM V A V V mA ZLOW Hz Range Shift Hold Esc Vsense MaxMin Auto Log View 2 600V CAT III 1000V CAT IV MAX FUSED 10A MAX FUSED 440mA NOTE Before conduct...

Page 24: ...urned off 7 Record the new security code and calibration Test Considerations For optimum performance all procedures should comply with the following recommendations The performance verification test or adjustment should be performed under laboratory conditions where the ambient temperature can be controlled The multimeter should be put under the laboratory environment for at least 1 hour Ensure th...

Page 25: ...ld be compared against the 1 year test limits After acceptance you should repeat the performance verification tests at every calibration interval If the multimeter fails the performance verification tests adjustment or repair is required NOTE Ensure that you have read the Test Considerations on page 24 before running the performance verification tests Table 1 2 ZLOW DC V performance verification t...

Page 26: ... 1 V 1 1 V 10 V 10 V 0 011 V 0 011 V 100 V 100 V 0 11 V 0 11 V 1000 V 1000 V 1 1 V 1 1 V a The impedance may be set to 1 GΩ from the Setup mode the default value is 10 MΩ in parallel with 100 pF nominal The accuracy of DC mV is specified after the Null function is used to subtract the thermal effect by shorting the test leads before measuring the signal b Before turning the rotary switch you must ...

Page 27: ...he position 1000 mV 1000 mV 40 Hz 10 3 mV 10 3 mV 1000 mV 1 kHz 10 3 mV 10 3 mV 1000 mV 2 kHz 15 3 mV 15 3 mV 10 V 10 V 40 Hz 0 103 V 0 103 V 10 V 1 kHz 0 103 V 0 103 V 10 V 2 kHz 0 153 V 0 153 V 100 V 100 V 45 Hz 1 03 V 1 03 V 100 V 1 kHz 1 03 V 1 03 V 100 V 2 kHz 1 53 V 1 53 V 1000 V 1000 V 45 Hz 10 3 V 10 3 V 1000 V 1 kHz 10 3 V 10 3 V 1000 V 2 kHz 15 3 V 15 3 V a The impedance may be set to 1 ...

Page 28: ...tary switch to the position and press 1000 mV 1000 mV 40 Hz N A 10 5 mV 1000 mV 1 kHz 10 5 mV 1000 mV 2 kHz 15 5 mV 10 V 10 V 40 Hz N A 0 105 V 10 V 1 kHz 0 105 V 10 V 2 kHz 0 155 V 100 V 100 V 45 Hz N A 1 05 V 100 V 1 kHz 1 05 V 100 V 2 kHz 1 55 V 1000 V 1000 V 45 Hz N A 10 5 V 1000 V 1 kHz 10 5 V 1000 V 2 kHz 15 5 V a The impedance may be set to 1 GΩ from the Setup mode the default value is 10 M...

Page 29: ...A 10 A b 10 A 0 035 A 0 035 A a 440 mA continuous and the signal greater than 440 mA 600 mA for 20 hours maximum After measuring current of 440 mA cool down the multimeter for the same measuring time you applied before performing low current measurement b 10 A continuous and the signal greater than 10 A 19 999 A for 30 seconds maximum After measuring current of 10 A cool down the multimeter for th...

Page 30: ...mA a 440 mA 40 Hz 4 7 mA 4 7 mA 440 mA 1 kHz 4 7 mA 4 7 mA 10 A b 10 A 45 Hz 0 125 A 0 125 A 10 A 1 kHz 0 125 A 0 125 A a 440 mA continuous and the signal greater than 440 mA 600 mA for 20 hours maximum After measuring current of 440 mA cool down the multimeter for the same measuring time you applied before performing low current measurement b 10 A continuous and the signal greater than 10 A 19 99...

Page 31: ... A a 440 mA continuous and the signal greater than 440 mA 600 mA for 20 hours maximum After measuring current of 440 mA cool down the multimeter for the same measuring time you applied before performing low current measurement b 10 A continuous and the signal greater than 10 A 19 999 A for 30 seconds maximum After measuring current of 10 A cool down the multimeter for the same measuring time you a...

Page 32: ...F 12 5 μF 10 mF 10 mF 0 125 mF 0 125 mF Shift Esc View Table 1 11 Resistance performance verification tests Test function Range 5520A 5522A output Error from nominal 1 year U1241C U1242C Resistance Turn the rotary switch to the position 1000 Ω a 1000 Ω 2 2 Ω 2 2 Ω 10 kΩ 10 kΩ 0 022 kΩ 0 022 kΩ 100 kΩ 100 kΩ 0 22 kΩ 0 22 kΩ 1000 kΩ 1000 kΩ 2 2 kΩ 2 2 kΩ 10 MΩ 10 MΩ 0 082 MΩ 0 082 MΩ 100 MΩ 25 MΩ 0 ...

Page 33: ...t function Range 5520A 5522A output Error from nominal 1 year U1241C U1242C Temperature Turn the rotary switch to the position 200 C to 1372 C 0 C 1 C 1 C 2 1 NOTE Set both Fluke 5520A and multimeter to internal reference Prior to performing measurements connect one end of the K type thermocouple with miniature TC connector on both ends to the 5520A TC output and the other end to a precision therm...

Page 34: ...entering the correct security code See Unsecuring the Multimeter for Calibration on page 35 The security code is set to when the multimeter is shipped from the factory The security code is stored in nonvolatile memory and does not change when power has been turned off or after a remote interface reset The security code may contain up to four numeric characters NOTE The security code can only be ch...

Page 35: ...th and together for more than 1 second to enter unsecured mode The calibration security code entry is shown on the display Figure 1 4 Calibration security code 2 Enter the default security code to unsecure the multimeter Press or to move the cursor to the left or right respectively Press or to increment or decrement the digit respectively NOTE If you forget your security code see To reset the cali...

Page 36: ...meter will enter the adjustment mode If the incorrect security code is entered an error code will appear briefly after which the multimeter will prompt you for the security code again 4 Exit the unsecured mode by pressing both and together for more than 1 second to secure the multimeter again See Figure 1 5 for the multimeter s display Hold Log Hold Log Shift Esc View ...

Page 37: ...242C Service Guide 37 Figure 1 5 Unsecuring the multimeter Press and for 1 sec Hold Log Shift Esc View Press and to enter the values Hz MaxMin Range Auto Vsense After appearing briefly Pass Press to confirm Hold Log Fail After appearing briefly ...

Page 38: ...ss or to move the cursor to the left or right respectively Press or to increment or decrement the digit respectively 3 Press to save the new calibration security code If the new calibration security code has been successfully changed will appear briefly after which the multimeter will enter the adjustment mode If the incorrect security code is entered an error code will appear briefly after which ...

Page 39: ...242C Service Guide 39 Figure 1 6 Changing the calibration security code Press for 1 sec Shift Esc View Press and to enter the values Hz MaxMin Range Auto Vsense After appearing briefly Pass Press to confirm Hold Log Fail After appearing briefly ...

Page 40: ...of the multimeter s serial number Press or to move the cursor to the left or right respectively Press or to increment or decrement the digit respectively 5 Press to confirm your entry If the four digits entered are correct the display will show briefly The calibration security code is now set to its factory default code If the incorrect security code is entered an error code will appear briefly af...

Page 41: ... Guide 41 Figure 1 7 Resetting the calibration security code to its factory default Press and to enter the values Hz MaxMin Range Auto Vsense After appearing briefly Pass Press to confirm Hold Log Fail After appearing briefly Press for 1 sec Shift Esc View ...

Page 42: ...n off the multimeter during calibration This may cause all calibration memory to be lost Ensure that you quit the calibration mode before turning off the multimeter Calibrate the DC mV prior to ambient temperature calibration Do not calibrate the DC mV immediately after a high current measurement or calibration Turn on the multimeter for at least 1 hour with the K type thermocouple connected befor...

Page 43: ...switch Turn the rotary switch to the positions as indicated above for the following calibration functions Table 1 14 Rotary switch positions for calibration Rotary switch position Calibration function 1 AC V or Vsense 2 DC V 3 Resistance 4 Diode or capacitance 5 DC AC μ mA 6 DC AC A 7 DC AC mV or temperature 1 2 3 4 5 6 7 ...

Page 44: ...erence value 10 000 V 10 000 V 55 Hz 0 9 to 1 1 x Reference value 10 000 V 1 kHz 0 9 to 1 1 x Reference value 1 000 V 55 Hz 0 9 to 1 1 x Reference value 10 000 V 55 Hz 0 9 to 1 1 x Reference value 10 000 V 10 kHz 0 9 to 1 1 x Reference value 100 00 V 10 00 V 55 Hz 0 9 to 1 1 x Reference value 100 00 V 55 Hz 0 9 to 1 1 x Reference value 100 00 V 1 kHz 0 9 to 1 1 x Reference value 100 00 V 10 kHz 0 ...

Page 45: ...o 1 1 x Reference value 100 00 mV 55 Hz 0 9 to 1 1 x Reference value 1000 0 mV 600 mV 030 0 mV 55 Hz 0 9 to 1 1 x Reference value 300 0 mV 55 Hz 0 9 to 1 1 x Reference value Temperature b Type K 0000 0 ºC 0 ºC with ambient compensation Resistance Short SHor Zero reference point 10 000 MΩ oPEn Open terminals 10 000 MΩ 0 9 to 1 1 x Reference value 1000 0 kΩ 1000 0 kΩ 0 9 to 1 1 x Reference value 100...

Page 46: ... 2 100 V 1 000 V 0 9 to 1 1 x Reference value DC μ mA Open oPEn Open terminals 1000 0 μA 1000 0 μA 0 9 to 1 1 x Reference value 10 000 mA 10 000 mA 0 9 to 1 1 x Reference value 100 00 mA 100 00 mA 0 9 to 1 1 x Reference value 1000 0 mA 300 00 mA 0 9 to 1 1 x Reference value AC μ mA 1000 0 μA 100 0 μA 55 Hz 0 9 to 1 1 x Reference value 1000 0 μA 55 Hz 0 9 to 1 1 x Reference value 10 000 mA 1 000 mA...

Page 47: ...close as possible to the standard signal source without any loads b Set the 5520A to internal reference Prior to performing adjustment connect one end of the K type thermocouple with miniature TC connector on both ends to the 5520A TC output and the other end to a precision thermometer to verify that the source outputs the desired value Adjust the source accordingly if necessary To perform the adj...

Page 48: ...sight U1241C U1242C Service Guide 7 Set the source output to 30 V 55 Hz 8 Press to start the calibration 9 When the calibration has completed set the calibrator to the standby mode See Figure 1 9 for the multimeter s display Hold Log ...

Page 49: ...ibration Procedures 1 Keysight U1241C U1242C Service Guide 49 Figure 1 9 Vsense non contact voltage calibration After appearing briefly Pass Fail Press to start calibration Hold Log After appearing briefly ...

Page 50: ...r the right standard value has been applied or refer to Calibration Error Codes on page 54 6 Repeat step 4 and step 5 until calibration has completed for all calibration values 7 Press or turn the rotary switch to select other values to be calibrated Repeat step 6 and step 8 NOTE Review the Test Considerations on page 24 and Adjustment considerations on page 42 before beginning the adjustment proc...

Page 51: ...r will return to the normal measurement mode and is secured 9 Verify the adjustments using the Performance Verification Tests on page 25 Exiting the adjustment mode 1 Remove all the shorting plugs and connectors from the multimeter 2 Record the new calibration count 3 Press both and together for more than 1 second to exit the calibration mode 4 Cycle the multimeter s power The multimeter will then...

Page 52: ...receive your multimeter take note of the calibration counts as a record for maintenance The calibration count increases by one for each calibration point from up to the maximum Once the maximum calibration count is reached the count will reset to The calibration count can be read after the multimeter has been unsecured The calibration count cannot be programmed or reset It is an independent electr...

Page 53: ...Calibration Procedures 1 Keysight U1241C U1242C Service Guide 53 Figure 1 10 Calibration count mode Press for 1 sec Hz MaxMin ...

Page 54: ...message 200 E200 Calibration error calibration mode is secured 002 E002 Calibration error secure code invalid 003 E003 Calibration error serial number code invalid 004 E004 Calibration error calibration aborted 005 E005 Calibration error value out of range or signal measurement out of range 006 E006 Calibration error signal measurement out of range 007 E007 Calibration error frequency out of range...

Page 55: ...ooting 56 Fuse Replacement 57 Returning the Multimeter for Service 59 Replaceable Parts 60 Types of Service Available 61 Obtaining Repair Service Worldwide 62 This chapter will help you troubleshoot a failing multimeter It also describes how to obtain repair services and lists the replaceable assemblies ...

Page 56: ...ch is not covered in this manual should only be performed by qualified personnel Table 2 1 Operating checklist Malfunction Identification No display when powered ON using the rotary switch Verify the batteries health and replace batteries as necessary No beeper tone Verify that the beeper is enabled in the multimeter s Setup mode Failed on current measurement Verify the fuses health and replace th...

Page 57: ...rotected by a 10 x 38 mm 11 A 1000 V 30 kA fast acting fuse Fuse 2 If you are certain that the fuse is faulty replace it with one of the same size and rating NOTE No recalibration is required after replacing the fuse CAUTION Before you proceed with the fuse replacement remove all cable connections to the terminals and ensure that the rotary switch is at the OFF position 1 Lift the tilt stand as sh...

Page 58: ... fuse gently by prying one end of the fuse with a flathead screwdriver and removing it out of the fuse bracket 6 Replace with a new fuse of the same size and rating 7 Ensure that the inner cover is positioned properly 8 Close the inner cover of the fuse compartment 9 Place the fuse cover back in its original position and tighten the screws Fuse 2 protecting A terminal Fuse 1 protecting terminal ...

Page 59: ...s model number Multimeter s serial number Description of the service required or failure indications 2 Remove all accessories from the multimeter Do not include accessories unless they are associated with the failure symptoms 3 Place the multimeter in its original container with appropriate packaging material for shipping If the original shipping container is not available place your multimeter in...

Page 60: ...ludes a brief description of each part with its corresponding Keysight part number To order replaceable parts You can order replaceable parts from Keysight using the Keysight part number Note that not all parts listed are available as field replaceable parts To order replaceable parts from Keysight do the following 1 Contact your nearest Keysight Sales Office or Service Center 2 Identify the parts...

Page 61: ...arranty After your warranty expires Keysight offers repair services at competitive prices Extended service contracts Many Keysight products are available with optional service contracts that extend the covered period after the standard warranty expires If you have such a service contract and your multimeter fails during the covered period Keysight will repair or replace it in accordance with the c...

Page 62: ... replaced and can provide warranty or repair cost information where applicable To obtain warranty service or technical support information you can contact Keysight worldwide via our Web link www keysight com find assist or contact your Keysight representative Before shipping your multimeter request the Keysight Service Center to provide shipping instructions including what components to ship Keysi...

Page 63: ...on is subject to change without notice Always refer to the Keysight website for the latest revision Keysight Technologies 2016 2017 Edition 5 April 21 2017 Printed in Malaysia U1241 90104 U1241 90104 www keysight com ...

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