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Keysight U1241B and U1242B Handheld Digital Multimeters

1. 5 Performance Tests and Calibration Input A Terminal Test This test determines if the input warning of the A current terminal test is functioning properly The multimeter sounds an alerting beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the corresponding A location The display indicates a flashing AErr annunciator until the test lead is removed from the A input terminal This warning alert is not available in T1 T2 temperature measurements mode Input mA Terminal Alert Test This test determines if the detected input voltage level is within the accepted boundaries when the UuA mA input terminal is connected The multimeter sounds an alerting beep when the uA mA input terminal detects a voltage level of higher than 1 6 V The display indicates a flashing CErr annunciator until the test lead is removed from the UA mA input terminal The alerting beep will not be impacted even if the beep function Is disabled Calibration Process 44 1 Prior to performing the verification tests see Test Considerations N Perform the verification tests to characterize the multimeter see Performance Verification Tests Unsecure the multimeter for calibration see Calibration Security Prior to performing the adjustments see Adjustment Considerations Perform the adjustment procedures see Calibration Adjustments ao 0 A w Secure the multimeter against unauthorized calibration see Exiting
2. Adjustment Mode Ensure that the multimeter has quit the Adjustment Mode and turned off 7 Record the new security code and calibration count in the multimeter s maintenance records U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Test Considerations Error may be induced by AC signals that present on the input leads Long test leads can also act as an antenna causing pick up of AC signals For optimum performance all procedures should comply with the following recommendations Ensure that the calibration ambient temperature is stable and between 18 C and 28 C Ideally the calibration should be performed at 23 C t2 oO Ensure that the ambient relative humidity RH is less than 80 Ensure that the low battery indicator does not appear during the performance verification test If it does replace the batteries to avoid any inaccurate reading During temperature performance verification test ensure that the multimeter has been switched ON and placed in the test environment for at least one hour with J K type thermo couple connected between the multimeter and calibration source Allow one minute warm up period with a Shorting Plug connected to the V and COM input terminals Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors Keep the input cables as short as possible Connect the input cable shields to earth ground Except where noted in the procedures
3. see Unsecuring the Multimeter for Calibration or Unsecuring the Multimeter Without the Security Code Once the multimeter has been unsecured the reference value will be indicated on the primary display Entering Adjustment Values p to step through each character in the primary 1 Press amp a g l 19 to change the value of the corresponding arai fon digits 0 each 9 3 Apply the respective corresponding input signal from the recommended test equipment in Table 5 1 4 Press Crewe Save when done to start calibration Ensure that the accuracy of the input signal adheres to the Valid Adjustment Input Values in Table 5 3 52 U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Adjustment Considerations After each adjustment the secondary display shows PAS If the calibration fails the multimeter beeps and an error number is shown in the secondary display Calibration error messages are described in Calibration Errors 1 Allow the multimeter to warm up and stabilize for five minutes before performing the adjustments 2 Assure that the low battery indicator does not appear during the adjustment Replace the batteries to avoid inaccurate readings 3 Consider the thermal effects of the test leads connected to the calibrator and multimeter It is recommended to wait for one minute before start performing the calibration 4 During ambient temperature adjustment ensure that the multimeter
4. 0 500 A function 1 A 70 Hz 1 000 A 10 A 70 Hz 10 000 A 12 Turn the rotary switch to 1 or Short Dual banana plug with SHrt T1T2 position copper wires short between two terminals 100 mV 100 mV 100 00 mV Press Cnn to go to T1 K type 0 C 000 0 C function Exiting Adjustment Mode 1 Remove all shorting plugs and connectors from the multimeter 2 Record the new Calibration Count see Calibration Count 3 Press Cnn J and Q p simultaneously to exit the Adjustment Mode Power off and on the multimeter to return to normal measurement mode and secured U1241B U1242B User s and Service Guide 59 5 Performance Tests and Calibration Calibration Count The multimeter provides the calibration count information for users to access through front panel operation Note that the multimeter was cali brated prior to shipping out to users Users are recommended to record the initial value of the calibration count once receiving the multimeter The count value increases by one for each calibration point from 0000 up to the maximum of 19999 After the maximum count the calibration count will be reset to 0 The calibration count can be read from the front panel after the multimeter has been unsecured see the following steps 1 In adjustment mode press and hold lt d gt for more than one second to view the calibration count viewing mode The primary display indicates the calibration count value while the secondary display indi
5. 7 Annunciator display for each switch condition Switch Condition mo Low Level lt 430 Q Normally close Intermittent Open to close Number of switch count High level Normally open 3 Press D to restart the switch counter the multimeter will check the current switch condition and set intermittent recognition for the counter 4 Press 4 D to select time base in 10 seconds 100 seconds or Hand user defined The second display shows 10 100 or HAn respectively 5 The first intermittent will cause the multimeter to beep and starts to down count the time base Each intermittent will increase the counter once 6 The counter value and time base are indicated on primary display and secondary display respectively Press n to start next counting 7 Press Com gt to exit switch counter function U1241B U1242B User s and Service Guide 17 2 Features and Functions MinMax Recording 18 The MinMax operation stores the maximum minimum and average input values during a series of measurements When the input goes below the recorded minimum or maximum value the multimeter beeps and records the new value The multimeter also calculates an average of all readings taken since the MinMax mode was activated From the multimeter s display you can view the following statistical data for any set of readings MAX highest reading since the MinMax function was enabled MIN lowest reading since the MinMax function was e
6. Co iak At gt Figure 1 4 Keypad and rotary switch of a U1242B handheld digital multimeter 6 U1241B U1242B User s and Service Guide Getting Started 1 Table 1 4 Keypad descriptions and functions Function Fistlevelnctions Range Second tevel functions press Range gia ea ee r multimeter H RATIO DCV measurement 0 1 mV to 1000 V ACV measurement measurement 50mVto1000V mV to 1000 V swe Diode measurement Switch counter measurement counter measurement EY Resistance E 1Q to 100 MQ continuity measurement measurement Capacitance 0 1 nF to 10 mF measurement 0 1 Ato 10mA ACHA measurement 50 Ato 10mA mAx gt DCmA a mA to 440 ame C AS a temperature 40 C to 1000 C T2 and T1 T2 temperature 40 C to 1000 C measurements for U1242B Table 1 5 Features that can be accessed through front panel keypad Scans the measured temperature for Press and hold for gt 1 second U1242B only Press and hold for gt 1 second Please use manual ranging to measure AC signal with a DC offset U1241B U1242B User s and Service Guide 7 1 Getting Started The Input Terminal at a Glance WARNING To avoid damaging this device do not exceed the input limit CAT IV 600 W Gar m 1000 V A A Max 1000 V MAX 1 A V OM Figure 1 5 Input terminal of a U1242B handheld digital multimeter Table 1 6 Terminal connections for different measurin
7. The temperature calculation is according to the standard of EN IEC 60548 1 and NIST175 3 Only available in U1242B U1241B U1242B User s and Service Guide 65 6 Specifications and Characteristics Capacitance Specifications Table 6 11 Capacitance specifications with accuracy of of reading No of Least Significant Digit Function Range Resolution Accuracy Capacitance 1000 0 nF 1 2 4 10 000 uF 0 001 uF 100 00 uF 0 01 uF 1000 0 uF 0 1 uF 10 000 mF 0 001 mF 1 Use the null operation to zero out residual offset before measuring the signal by opening the test leads Harmonic Ratio Specifications Table 6 12 Harmonics ratio specifications Function Rangel 0 0 99 9 40 Hz 500 Hz 100 mVAC 1000 VAC 1 Overload protection 1000 V R M S for circuits lt 0 3 A short circuit current The accuracy is calculated based on the film capacitor Use Relative mode for residual value 2 Pure sinusoidal waveforms without harmonics have a harmonics ratio of 0 higher the harmonics ratio more harmonics are present in the sinusoidal waveform 66 U1241B U1242B User s and Service Guide Specifications and Characteristics 6 Frequency Specifications Table 6 13 Frequency specifications with accuracy of of reading No of Least Significant Digit Frequency 100 00 Hz 0 01 Hz 10 000 kHz 0 001 kHz oe 00 kHz 0 01 kHz 1000 00 kHz 00 kHz 0 1 kHz Frequency Sensitivity During Vol
8. User s and Service Guide 21 2 Features and Functions 3 Press Log for more than one second to exit this mode Figure 2 6 Manual logging display Maximum data that can be stored is 100 entries When the 100 entries are filled FUL annunciator Is indicated on the secondary display Interval Logging To enable the Interval automatic logging function select the Interval log ging by defining the interval setting in Setup mode 1 Press C gt Log for more than one second to store the present value and function on primary display to memory 2 The reading automatically logs into the memory in every interval as preset in Setup mode see Figure 2 7 3 Press 2 Log for more than one second to exit this mode When interval automatic logging is enabled all keypad operation is disabled except for Log function 22 U1241B U1242B User s and Service Guide Features and Functions 2 wa GUC AUTO OFT v UO o 100 a OFF aT Ts OFF Figure 2 7 menal logging display Maximum data that can be stored is 200 entries When the 200 entries are filled FUL annunciator is indicated on the secondary display Reviewing Logged Data 1 Press D View for more than one second to enter Log View mode The last recorded entry and last logging index are displayed on the secondary display 2 Press A to ascend or W to descend through logged data Press to select the first record and press g
9. an explosive atmosphere or in the presence of flammable gases or fumes e Inspect the case for cracks or missing plastic Pay extra attention to the insulation surrounding the connectors Do not use the multimeter if it is damaged U1241B U1242B User s and Service Guide V Vi CAUTION Inspect the test probes for damaged insulation or exposed metal and check for continuity Do not use the test probe if it is damaged Do not use repaired fuses or short circuited fuse holders For continued protection against fire replace the line fuses only with fuses of the same voltage and current rating and recommended type Do not service or perform adjustments alone Under certain conditions hazardous voltages may exist even with the equipment switched off To avoid dangerous electric shock service personnel must not attempt internal service or adjustment unless another person capable of rendering resuscitation or first aid is present Do not substitute parts or modify equipment to avoid the danger of introducing additional hazards Return the product to Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained Do not operate damaged equipment as the safety protection features built into this product may have been impaired either through physical damage excessive moisture or any other reason Remove power and do not use the product until safe operation can be verified by service
10. and Service Guide 1 Getting Started Introduction 2 Checking the Shipping Contents 3 The Front Panel ata Glance 4 Adjusting Tilt Stand 4 The Annunciator ata Glance 5 The Keypad and Rotary Switch ata Glance 6 The Input Terminal ata Glance 8 This chapter introduces key features and steps to get started with a U1241B or U1242B handheld digital multimeter This chapter also guides you through the basics of the front panel operations KEYSIGHT TECHNOLOGIES 1 Getting Started Introduction The handheld digital multimeters key features are DC AC voltage and current measurements True RMS measurement for both AC voltage and current Harmonic ratio for power quality of sine wave for U1242B Switch counter for detecting the bounce of switch Ambient temperature display with each measurement Scan temperature measurement for T1 T2 and T1 T2 for U1242B Resistance measurement up to 100 MQ Diode and audible continuity tests Capacitance measurement up to 10mF The scale readout for 4 20 mA or 0 20 mA measurement Temperature test with selectable 0 C compensation without ambient temperature compensation K type for U1241B and J K types temperature measurement for U1242B MinMax Recording for minimum maximum and average readings Data Hold with manual or auto trigger Null Relative function Auto or manual data logging memories for U1242B Battery capacity indicator Adjustable brightness level of orange LED
11. and troubleshooting hints to solve general problems that you may encounter with the multimeter 5 Performance Tests and Calibration Chapter 5 contains the procedures of the performance verification tests and calibration adjustments 6 Specifications and Characteristics Chapter 6 lists the specifications and characteristics of the U1241B and U1242B handheld digital multimeters U1241B U1242B User s and Service Guide IX THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK U1241B U1242B User s and Service Guide Contents U1241B U1242B User s and Service Guide Contents Getting Started 1 Introduction 2 Checking the Shipping Contents 3 The Front Panel ata Glance 4 Adjusting Tilt Stand 4 The Annunciator ata Glance 5 Analog Bar Graph 6 The Keypad and Rotary Switch ata Glance 6 The Input Terminal ata Glance 8 Features and Functions 9 Measuring Voltage 10 Measuring Current gt 440 mA 10 Measuring Current lt 440 mA 11 Measuring Scale of 4 20 mA 11 Measuring Frequency 12 Measuring Resistance and Testing Continuity 12 Testing Diodes 13 Measuring Capacitance 14 Measuring Temperature 14 Measuring Harmonic Ratio U1242B 16 Using Switch Counter 16 MinMax Recording 18 Data Hold Trigger Hold 19 Refresh Hold 19 Null Relative 20 Data Logging U1242B 20 Scanning Temperature Measurement U1242B 23 Checking Battery Capacity 24 Alerts and Warning During Measurement 25 Contents Xl 3 Default Setti
12. battery cover screw Figure 4 9 Battery replacement Fuse Replacement Users are recommended to use clean dry gloves when performing fuse replacement Do not touch any components except the fuse and plastic parts No recalibration is required after replacing the fuse 1 Turn off the multimeter and disconnect the test leads from external equipment 2 Loosen four screws on bottom case lift and remove the cover U1241B U1242B User s and Service Guide 33 4 Service and Maintenance 3 Gently remove the defective Fuse 1 by prying one end of the fuse and removing it out of the fuse bracket see Figure 4 10 4 Replace a new fuse of the same size and rating into the center of the fuse holder Fuse 1 440 mA 1000 V Figure 4 10 Fuse 1 replacement 5 If you want to replace a defective Fuse 2 remove Fuse 1 then loosen the four screws shown in Figure 4 11 to lift and remove the circuit board from top case 6 Gently remove the defective Fuse 2 by prying one end of the fuse loose and removing it out of the fuse bracket see Figure 4 11 Fuse 2 11 mA 1000 V 34 U1241B U1242B User s and Service Guide Service and Maintenance 4 7 Replace a new fuse of the same size and rating into the center of the fuse holder Figure 4 11 Fuse 2 replacement 8 Place Fuse 1 back to its original position and then re fasten the circuit board and the bottom cover respectively Troubleshooting WARNING To avoid electrical shock do n
13. removed Altitude 0 2000 meters per IEC 61010 1 2d Edition CAT IlI 1000 V CAT IV 600 V Safety Compliance IEC 61010 1 2001 EN61010 1 2001 USA UL 61010 1 2004 Canada CSA C22 2 No 61010 1 2004 Measurement Category CAT III 1000 V7 CAT IV 600 V Overvoltage Protection Pollution degree 2 EMC Compliance Certified to IEC 61326 1 2005 EN 61326 1 2006 Canada ICES NMB 001 2004 Australia New Zealand AS NZS CISPR11 2004 Common Mode Rejection Ratio CMRR gt 90 dB at DC 50 60 Hz 0 1 1 kQ unbalanced Normal Mode Rejection Ratio NMRR gt 60 dB at 50 60 Hz 0 1 Temperature Coefficient 0 1 x specified accuracy C from 10 C to 18 C or 28 C to 55 C Crest Factor lt 3 0 Shock and Vibration Tested to IEC EN 60068 2 Dimension HxWxD 193 8 mm x 92 2 mm x 58 mm U1241B U1242B User s and Service Guide 69 6 70 Specifications and Characteristics Weight 450 g with batteries 400 g without batteries Warranty e Please refer to http www keysight com go warranty_terms Three years for the product Three months for the product s standard accessories unless otherwise specified e Please take note that for the product the warranty does not cover Damage from contamination Normal wear and tear of mechanical components Manuals fuses and standard disposable batteries U1241B U1242B User s and Service Guide www keysight com Contact us To obtain service warranty or technical su
14. second to enter Calibration Security Code setting mode 2 The factory default calibration security code 1234 will be displayed on primary display 5 If the new calibration security code has been successfully stored the secondary display will show PASS If the new code failed to save the multimeter will shows error code E07 on the secondary display for approximately 3 seconds and return to the Calibration Security Code setting mode Unsecuring the Multimeter Without the Security Code 1 Record the last 4 digit serial numbers of the multimeter 2 Turn the a i to ACV 3 Press Cs shit nit and 2 simultaneously to enter the Calibration Security Code entry mode The primary display shows 5555 and the secondary display shows SEC 4 Press Cnn for more than one second to enter Set Default Security Code mode The secondary display shows SEr and primary display shows 5555 5 Press amp and Press 7 If the 4 digit serial number entered is correct the secondary display will show PAS If an invalid code is entered the multimeter will show U1241B U1242B User s and Service Guide 51 5 Performance Tests and Calibration error code E03 Ensure that the last 4 digit serial number is entered correctly and repeat the step 1 to 7 Using the Front Panel for Adjustments This section describes the process used to perform adjustments from the front panel Selecting the Adjustment Mode Unsecure the multimeter
15. shorting plugs from input terminals SHrt SHrt oPEn 10 000 MQ 1000 0 kQ 100 00 kQ 10 000 kQ 1000 Q oPEn 400 0 nF 1000 0 nF 10 000 uF 100 00 uF 1000 0 uF 10 000 mF 5 57 5 Performance Tests and Calibration U1241B U1242B User s and Service Guide al aa Turn the rotary switch to Open Input terminals open oPEn LA AS position remove all test leads and shorting plugs from input terminals 1000 uA 1000 uA 1000 0 uA 10000 uA 10000 uA 10000 uA 7 Press Cs togoto o uA 1000 pA 50 uA 70 Hz 50 0 uA function 100 uA 70 Hz 100 0 uA 1000 uA 70 Hz 1000 0 uA 10000 uA 1000 uA 70 Hz 1000 uA 10000 uA 70 Hz 10000 uA Turn the rotary switch to Open Input terminals open oPEn mA 3 position remove all test leads and shorting plugs from input terminals 100 mA 100 mA 100 00 mA 1000 mA 320 mA 320 0 mA Press Cn togoto mA 100mA 5 mA 70 Hz 5 00 mA function 10 mA 70 Hz 10 00 mA 100 mA 70 Hz 100 00 mA 1000 mA 100 mA 70 Hz 100 0 mA 320 mA 70 Hz 320 0 mA Performance Tests and Calibration 5 ep amet ae R Move the test lead from uA mA and COM terminal to A and COM terminal D Caution Connect the calibrator to the multimeter s A and COM terminal before applying 10 A 10 Turn the rotary switch to AAG Open Input terminals open oPEn position remove all test leads and shorting plugs from input terminals 10A 10A 10 000 A 11 Press Cn to go to o A 10A 0 5 A 70 Hz
16. 000 kQ 100 00 kQ 1000 0 kQ 10 000 MQ 100 00 MQ 1000 0 nF 10 000 uF 100 00 uF 1000 0 uF 10 000 mF 1000 0 uA 10000 uA 1000 0 uA 500 Hz 1000 0 uA 1 kHz 10000 uA 500 Hz 10000 uA 1 kHz 100 0 mA 400 0 mal 100 00 mA 500 Hz 100 00 mA 1 kHz 400 mAls 500 Hz 400 mAL 1 kHz U1241B U1242B User s and Service Guide Error from nominal 1 year 33 QI 33 QN 330 Q 3 3 kQ 83 kQ 1 53 MQ 2 12 4nF 0 124 uF 1 24 uF 20 4 uF 0 204 mF 1 3 uA 13 uA 10 5 uA 15 5 uA 105 uA 155 uA 0 23 mA 2 3mA 1 05 mA 1 55 mA 4 5mA 6 5mA Performance Tests and Calibration 5 ae n ae iaiee p11 Turn the Turn the rotary switch to AAG position switch to Turn the rotary switch to AAG position position WA A 10 000 aooooAa 65 mA Ka Press C to go to _A function CO A 10 000 CLN 500 Hz 105 mA 10 A 10 000 A 1 kHz 155 mA 13 Turn the rotary switch to T1 or T1T2 40 C until 40 C 1 4 C position 1000 c iit EIN 1000 C 11 C 14 Press sue to go to T2 function 40 C until 40 C 1 4 C 1000 c nc eae 1000 C 11 C 1 The accuracy of 1 kQ and 10 kQ are specified after Math Null that is used to substrate the test lead resistance and the thermal effect 2 For the range of 100 MQ the RH is specified for lt 60 3 Current can be measured from 50 mA to 440 mA continuously An addition of 0 2 to the specified accuracy when measu
17. 10 A to 19 999 A for 15 seconds maximum After measuring a current of gt 10 A leave the multimeter to cool down for 60 seconds before applying low current measurement U1241B U1242B User s and Service Guide 63 6 Specifications and Characteristics Resistance Specifications Table 6 8 Resistance specifications with accuracy of of reading No of Least Significant Digit Test Current Accuracy Range Resolution Burden Voltage Resistance 1000 0 10 007 MR 0 1 Q 0 s05mA mA eo kQ a 0 3 3 100 00 kQ 0 01 kQ 4 91 uA 1000 0 kQ 0 1 kQ 441 nA 10 000 MQ 0 001 MQ 112 nA 0 8 3 112 nA 3 0 100 00 MQ ee in parallel with 10 MQ 19 3 Diode Check Audible Continuity Test Specifications Table 6 9 Diode test audible continuity test specifications with accuracy of of reading No of Least Significant Digit Range Resolution Test Current Accuracy Burden Voltage Diode test 4 1V 0 001 V Approximately 0 5 mA 0 3 2 1 The maximum open voltage is lt 2 8 V For instant continuity the built in buzzer sounds when resistance is lt 1 of each resistance range 2 The accuracy of 1 KQ and 10 kQ is specified after Null function which is used to substrate the test lead resistance and the thermal effect 3 For the range of 100 MQ the R H is specified for lt 60 The temperature coefficient will be 0 15 times of specified accuracy as gt 50 MQ 4 Overload protection 1000 V R M S fo
18. 1241B U1242B User s and Service Guide Specifications and Characteristics 6 AC Specifications WARNING Exceeding the crest factor limit may result in an incorrect or a lower reading Do not exceed the crest factor limit to avoid instrument damage and the risk of electric shock Table 6 7 AC specifications with accuracy of of reading No of Least Significant Digit Range Resolution Burden Voltage 49 Hzto500Hz 500Hzto1kHz 1kHzto2kHz mo fo a wo ory f a 1 Input impedance 10 MQ nominal in parallel with lt 100 pF with overload protection of 1000 V R M S 2 ACV and AC uA mA A specifications are true RMS AC coupled valid from 5 to 100 of range The crest factor may up to 3 at full scale and for 1000 V range the crest factor is 1 5 at full scale For non sinusoidal waveforms with crest factor lt 3 add 2 reading 2 full scale typical 3 Current can be measured from 50 mA to 440 mA continuously An additional 0 2 needs to be added to the specified accuracy if the signal measured is in the range of 440 mA to 1100 mA for 30 seconds maximum After measuring current of gt 440 mA leave the multimeter to cool down for twice the measuring time used before application of low current measurement 4 Current can be measured from 0 5 A up to 10 A continuously with the maximum operating temperature of 50 C An additional 0 3 needs to be added to the specified accuracy if the signal measured is in the range of
19. 241B U1242B User s and Service Guide Performance Tests and Calibration 5 Adjustment is Recommended Specifications are only guaranteed within the period stated from the last adjustment Keysight recommends that readjustment should be performed during the calibration process for best performance This will assure that the U1241B U1242B will remain within specification This criteria for re adjustment provides the best long term stability Performance data is measured during Performance Verification Tests and does not guarantee the multimeter will operate within the test limits unless the adjustment is performed Refer to Calibration Count to verify that all adjustments have been performed U1241B U1242B User s and Service Guide 41 5 Recommended Test Equipment 42 Performance Tests and Calibration The test equipment recommended for the performance verification and adjustment procedures is listed below If the exact equipment is not available substitute the calibration standards of equivalent accuracy Table 5 1 Recommended test equipment Application DC Voltage DC Current AC Voltage AC Current Resistance Frequency Capacitance Diode Temperature Short Recommended Equipment Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A Fluke 5520A K type thermal sensor Recommended Accuracy Requirements lt 1 5 instrument 1 year specifications lt 1 5 instrumen
20. Keysight U1241B and U1242B Handheld Digital Multimeters User s and KEYSIGHT Service Guide TECHNOLOGIES NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com KEYSIGHT TECHNOLOGIES U1241B U1242B User s and Service Guide Notices Keysight Technologies 2009 2015 No part of this manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign language without prior agree ment and written consent from Keysight Technologies as governed by United States and international copyright laws Manual Part Number U1241 90063 Edition Edition 14 June 19 2015 Printed in Malaysia Keysight Technologies 1400 Fountaingrove Parkway Santa Rosa CA 95403 Warranty The material contained in this docu ment is provided as is and is sub ject to being changed without notice in future editions Further to the max imum extent permitted by applicable law Keysight disclaims all warran ties either express or implied with regard to this manual and any infor mation contained herein including but not limited to the implied warran ties of merchantability and fitness for a particular purpose Keysight shall not be liable for errors or for inciden tal or consequential damages in con nection with the furni
21. ative reference temperature 4 Touch the measurement surface with the thermocouple probe Read the display for the relative temperature The T2 temperature measurement is only available for U1242B U1241B U1242B User s and Service Guide 15 2 Features and Functions Measuring Harmonic Ratio U1242B Press A t H RATIO V at position SW C at p position 16 Harmonics ratio function indicates the deviation of non sinusoidal to sinusoidal waveform from the range of 0 to 100 A pure sinusoidal waveform without harmonics gives a value of 0 0 Alternatively press nse button to display the RMS value of AC voltage The multimeter will resume back to harmonic ratio value display automatically after 3 seconds The switch counter is used to check the open close condition of a switch relay or push button The multimeter provides the time base of 10 and 100 seconds or user defined time base This function detects switch condition in normally close Low level or normally open High level of a circuit with voltage less than 3 V The switch counter counts the intermittent for longer than 250 usec U1241B U1242B User s and Service Guide Features and Functions 2 1 Remove the power on the contacts or switch before measured 2 Press Cs gt at position to activate the switch counter function The multimeter will detect the switch condition as shown in Table 2 7 Table 2
22. backlight display Closed case calibration 10 000 count precision true RMS digital multimeter designed to meet EN IEC 61010 1 2001 Category III 1000 V Category IV 600 V Overvoltage Protection Pollution Degree II standards U1241B U1242B User s and Service Guide Getting Started 1 Checking the Shipping Contents Verify that you have received the following items for the standard shipped items or optional accessories that you may have ordered If any of the above item missing or any mechanical damage and defect on the multim eter notify your nearest Keysight Technologies Sales Office Table 1 1 List of standard items and optional accessories Time Medel tems U1241B U1242B User s and Service Guide 3 1 Getting Started The Front Panel at a Glance Xe Agilent UTZ428 Annunciator Keypad Rotary Switch A ThA biih 7 7 waa vuar di e r mya ah ma 7 a OE LS ae i eS Oe Leh Input Terminal 2 6 0 9 cof 7 i Figure 1 1 Front panel of a U1241B and U1242B handheld digital multimeters Adjusting Tilt Stand Tilt stand at 60 Tilt stand at 30 Pull the tilt stand outwards to its Bend the tip of the stand maximum reach approximately 60 Figure 1 2 Tilt stand positions 4 U1241B U1242B User s and Service Guide Getting Started 1 The Annunciator at a Glance To view the full display press and hold J while turning the rotary switc
23. cates Cnt 2 Take note of the calibration count to keep track of the number of calibration counts that has been performed 3 Press and hold count mode 2 for more than one second to exit the calibration Calibration Errors 60 The following error codes indicate failures that may occur during a calibration The error code is displayed on secondary display Table 5 5 Calibration error codes Code Descriptions 200 Calibration error Calibration mode is secured E02 Calibration error Invalid secure code E03 Calibration error Invalid serial number code E04 Calibration error Calibration aborted E05 Calibration error Value out of range E06 Calibration error Signal measurement out of range E07 Calibration error Frequency out of range E08 EEPROM write failure U1241B U1242B User s and Service Guide This chapter lists specifications and characteristics of the U1241B and U1242B handheld digital multimeters These specifications apply when using the multimeter in an environment that is free of electromagnetic U1241B and U1242B Handheld Digital Multimeter User s and Service Guide 6 Specifications and Characteristics DC Specifications 62 AC Specifications 63 Resistance Specifications 64 Diode Check Audible Continuity Test Specifications 64 Temperature Specifications 65 Capacitance Specifications 66 Harmonic Ratio Specifications 66 Frequency Specifications 6 7 Operating Specifications 68 General Character
24. connect the calibrator LO source to earth ground at the calibrator It is important that the LO to earth ground connection be made at only one place in the circuit to avoid ground loops During DC voltage DC current and resistance gain verification measurements ensure that the calibrator s 0 output is correct It is recommended to set the offset for each range of the measuring function being verified U1241B U1242B User s and Service Guide 45 5 Performance Tests and Calibration Input Connections Test connections to the multimeter are best accomplished using the K type thermocouple wire and mini connectors for temperature measurement The J type thermocouple wire and mini connectors can also be used for temperature measurements for U1242B Shielded twisted pair PTFE interconnect cables of minimum length are recommended between the calibrator and the multimeter Cable shields should be earth ground referenced This configuration is recommended for optimal noises and settling time performance during calibration Performance Verification Tests 46 The performance verification tests are recommended as acceptance tests when you first receive the multimeter The acceptance test results should be compared against the one year test limits After acceptance you should repeat the performance verification tests at every calibration interval If the multimeter fails performance verification adjustment or repair is required U
25. dheld Digital Multimeter User s and Service Guide 3 Default Setting Configurations Setting Configurations 28 This chapter describes on how to change and configure the default setting of U1241B and U1242B handheld digital multimeters including data logging and other setting features KEYSIGHT TECHNOLOGIES 3 Default Setting Configurations Setting Configurations 28 1 Turn off the multimeter 2 From OFF position press and hold Com gt Setup while turning the rotary switch to any non OFF position After you hear a beep the multimeter is in Setup mode and you can release Csnin gt button To change a menu item setting in Setup mode perform the following steps 1 Press or to scroll through menu items 2 Press A or W to scroll through available settings See Table 3 9 for the details of each available option 3 Press fans Save to save the changes These parameters remain in the non volatile memory 4 Press and hold Setup for more than one second to exit Setup mode U1241B U1242B User s and Service Guide Default Setting Configurations 3 Table 3 9 Available setting options in Setup mode Menuitem Available setting options Default factory Description Selection Description See Trigger hold Enables Data Hold manual trigger 100 1000 Sets variation count that determines Refresh Hold auto trigger Percentage scale 0 20 mA Sets scale readout for 0 to 20 mA or 4 t
26. e seconds before the display returns to zero To exit this mode press snu while NULL is flashing on the display e n resistance measurement the multimeter reads a non zero value due to the presence of test leads resistance Use the Null function to zero adjust the effect of test lead resistance e In DC voltage measurement the thermal effect will influence the accuracy Short the test leads and press offset once the displayed value Is stable in order to zero out the Data Logging U1242B 20 The data logging function stores the data in non volatile memory Thereby the data remains saved when the multimeter is turned off Data logging records only the value on primary display Two options of data logging are offered Hand manual logging and Interval automatic logging func tions Table 2 8 Functions available for data logging aa p ime __ DG AG af mA 1000 Ato T0A U1241B U1242B User s and Service Guide Features and Functions 2 woe tne Switch Counter Capacitance Temperature T1 T2 11 T2 Relative Recording mode MAX MIN AVG MAXMINAVG HOLD Manual Logging To enable the Hand manual logging function select the Hand logging mode in Setup mode 1 Press 2 Log for more than one second to store the present value and function on primary display to memory 2 Press W 2 Log again for the next value that you want to save into memory see Figure 2 6 U1241B U1242B
27. essing to change measurement unit to F Sets temperature measurement to F Sets temperature measurement to F pressing Range to change measurement unit to C a k Sets temperature measurement to C 1 To activate the multimeter after it has auto power off press any button to resume back to respective functional mode 2 The firmware is factory installed and is not field upgradeable 3 To view Temperature t P menu press L amp 2 for more than one second 4 After this setting has been changed resetting the multimeter will not revert it to the original default factory setting The current setting will be the new default setting 30 U1241B U1242B User s and Service Guide U1241B and U1242B Handheld Digital Multimeter User s and Service Guide A Service and Maintenance General Maintenance 32 Battery Replacement 32 Fuse Replacement 33 Troubleshooting 35 Returning Instrument for Service 37 This chapter provides you with warranty services maintenance procedures and troubleshooting hints to solve general problems that you may encounter with the instrument Repair or service which are not covered in this manual should only be performed by qualified personnel KEYSIGHT TECHNOLOGIES 4 Service and Maintenance General Maintenance WARNING To avoid electrical shock or damage to the multimeter ensure no water stays inside the casing Besides the above hazard dirt or moisture in the term
28. g bAt annunciator and the bar graph indicates the battery capacity in proportional percentage from 4 2 V 0 to 6 0 V 100 Figure 2 8 Battery capacity display 24 U1241B U1242B User s and Service Guide Features and Functions 2 Alerts and Warning During Measurement Overload Alert WARNING For your safety please be aware of the alert When you are alerted just remove the test leads from the measuring source The multimeter provides an overload alert for voltage measurement in both auto and manual range modes The multimeter beeps periodically once the measuring voltage exceeds 1100 0 V For your safety please be aware of this alert Input A Warning Alert The multimeter sounds an alerting beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the corresponding A location The display indicates a flashing AErr annunciator until the test lead is removed from the A input terminal This warning alert is not available in T1 T2 temperature measurements mode Input mA Warning Alert The multimeter sounds an alerting beep when the UA mA input terminal detects a voltage level of more than 1 6 V The display indicates a flashing CErr annunciator until the test lead is removed from the uA mA input terminal U1241B U1242B User s and Service Guide 25 2 Features and Functions THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 26 U1241B U1242B User s and Service Guide U1241B and U1242B Han
29. g functions Measurement Input terminal Overload Protection Functions ie 1000 V R M S lt 0 3 A short circuit current Bell amp mA uA mA mA 1000 V 30 kA fast Daa Daa 11 A 1000 V 30 kA fast acting fuse Temperature 1000 V R M 1000VRMS E for e E E mA 1000 V 30 kA fast acting U1242B only fuse 8 U1241B U1242B User s and Service Guide U1241B and U1242B Handheld Digital Multimeter User s and Service Guide 2 Features and Functions Measuring Voltage 10 Measuring Current gt 440 mA 10 Measuring Current lt 440 mA 11 Measuring Scale of 4 20 mA 11 Measuring Frequency 12 Measuring Resistance and Testing Continuity 12 Testing Diodes 13 Measuring Capacitance 14 Measuring Temperature 14 Measuring Harmonic Ratio U1242B 16 Using Switch Counter 16 MinMax Recording 18 Data Hold Trigger Hold 19 Refresh Hold 19 Null Relative 20 Data Logging U1242B 20 Scanning Temperature Measurement U1242B 23 Checking Battery Capacity 24 Alerts and Warning During Measurement 25 This chapter contains the detailed information on how to configure connections to perform the multimeter measurements using the U1241B and U1242B handheld digital multimeters It builds on information already provided in the Quick Start Guide KEYSIGHT TECHNOLOGIES 2 Features and Functions Measuring Voltage Ensure that terminal connections are correct for that particular measurement before any measure
30. h adjustment point shown in the calibration adjustment see Table 5 4 10 Verify the adjustments using the Performance Verification Tests Table 5 4 Calibration Adjustments m om Turn the rotary switch to ASV position 2 Press C to go to Na V function 56 Short 1000 mV 10 V 100 V 1000 V 1000 mV 10 V 100 V 1000 V Input Reference Value Dual banana plug with copper wires short between two terminals 1V 10 V 100 V 1000 V 30 mV 70 Hz 1000 mV 70 Hz 1000 mV 1 kHz 1 V 70 Hz 10 V 70 Hz 10 V 1 kHz 10 V 70 Hz 100 V 70 Hz 100 V 1 kHz 100 V 70 Hz 1000 V 70 Hz 1000V 1 kHz SHrt 1000 0 mV 10 000 V 100 00 V 1000 0 V 30 0 mV 1000 0 mV 1000 0 mV 1 000 V 10 000 V 10 000 V 10 00 V 100 00 V 100 00 V 100 0 V 1000 0 V 1000 0 V U1241B U1242B User s and Service Guide Test Function Turn the rotary switch to Open position 1000 nF 10 uF 100 uF 1000 uF 10 mF Turn the rotary switch to Short position 10 MQ 1000 kQ 100 kQ 10 kQ 1000 Q U1241B U1242B User s and Service Guide Performance Tests and Calibration a eee ee Turn the rotary switch to f Short position Dual banana plug with copper wires short between two terminals Dual banana plug with copper wires short between two terminals Input terminals open remove all test leads and shorting plugs from input terminals Input terminals open remove all test leads and
31. h from OFF to any non OFF position Press any key to resume normal functionality mode 9 11 13 15 8 10 12 14 sl eeu AUTO gt EMMA MAXMINAVG NULL ME K CFn 7 5 OD mAVF SOOO oe a y 1 n aA PP eR 1 if amp fH if ff fe fe E et rm al Auto TUTTE TEETER TEED OFF Figure 1 3 Annunciator display of a U1242B handheld digital multimeter Table 1 2 Descriptions of each annunciator a nn e 3 Data logging mode for U1242B Audible continuity for resistance and diode function Auto or manual for data logging mode and datalog Primary display HABA _ viewing mode 15 Secondary display temperature display Data logging View mode for U1242B 5 Diode Audible continuity Thermocouple type for temperature measurement T1 T2 and T1 T2 temperature measurements scan T1 T2 or T1 T2 temperature measurements T2 temperature measurement and delta T1 T2 are only available for U1242B U1241B U1242B User s and Service Guide 5 1 Getting Started Analog Bar Graph When frequency is indicated on the primary display during voltage or current measurement the bar graph represents the voltage or current value When 4 20 mA scale or 0 20 mA scale is indicated on the primary display the bar graph represents the current value Each segment represents 500 or 50 counts depending on the range indicated on the peak bar graph Table 1 3 Bar graph counts Fo pal Save Max a
32. has been turned on for at least one hour with K type thermocouple connected between the multimeter and calibration source CAUTION Do not turn off the multimeter during adjustments as this may delete the calibration mem ory for the present function U1241B U1242B User s and Service Guide 53 5 Performance Tests and Calibration Valid Adjustment Input Values Adjustment can be accomplished using the following input values below Table 5 3 Valid adjustment input values Function Range Valid Input Reference Values 1000 mV 10 V 100 V 1000 V 0 9 to 1 1 x Full Scale me N Vy 1000 mV 10 V 100 V 1000 V 0 9 to 1 1 x Full Scale gt 1V 0 9 to 1 1 x Full Scale O 1000 Q 10 kQ 100 kQ 1000 kQ 10 MQ 0 9 to 1 1 x Full Scale 4 1000 nF 10 uF 100 uF 1000 uF 10 mF 0 9 to 1 1 x Full Scale PAKS 1000 uA 10000 pA 0 9 to 1 1 x Full Scale mAZAS 100 mA 1000 mA 0 9 to 1 1 x Full Scale AAG 10 A 0 9 to 1 1 x Full Scale T1 0 C Ensure that 0 C with ambient compensation is provided DCmV 100 mV 0 9 to 1 1 x Full Scale T1 CAUTION The minimum AC current output of Fluke 5520A calibrator is 29 uA Ensure that at least 50 uA is set at the calibrator source of AC uA 54 U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Calibration Adjustments Review the Test Considerations and Adjustment Considerations before beginning the adjustment procedures 1 Turn the rotary switch to Test Function position as sh
33. inals can distort readings Cleaning steps are as follows 1 Turn the multimeter off and remove the test leads 2 Turn the multimeter over and shake out any dirt that may have accumulated in the terminals 3 Wipe the case with a damp cloth and mild detergent do not use abrasives or solvents Wipe the contacts in each terminal with a clean swab dipped in alcohol Battery Replacement WARNING Do not discharge the battery by shorting the battery or reverse the battery polarity in any subjects CAUTION To avoid instruments being damage from battery leakage e Always remove dead batteries immediately e Always remove the batteries and store them separately if the multimeter is not going to be used for a long period The multimeter is powered by 6 0 V 1 5 V x 4 batteries which must be the specified battery type To ensure that the multimeter performs as specified it is recommended that you replace the battery as soon as the low battery indicator is flashing See the following procedures for battery replacement 1 At the rear panel lift up the stand 2 Loosen the screw on the battery cover 32 U1241B U1242B User s and Service Guide Service and Maintenance 4 3 Lift and remove the battery cover 4 Replace the specified batteries ensure the correct polarity of batteries 5 Reverse the procedures of opening the cover to close the battery cover Battery Types ANSI NEDA IEC Alkaline 24A LRO3 Zinc Chloride 24D R03
34. ing procedure practice or the like that if not correctly per formed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indicated condi tions are fully understood and met U1241B U1242B User s and Service Guide Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument EA Direct current DC Ko Off supply Alternating current AC od On supply Both direct and alternating current A Caution risk of electric shock Three phase alternating current Caution risk of danger refer to this manual for specific Warning or Caution information ra Protective conductor terminal Out position of a bi stable push control Frame or chassis terminal In position of a bi stable push control Equipotentiality CAT III Category III 1000 V Overvoltage Y Protection 1000 V Equipment protected throughout by CAT IV Category IV 600 V Overvoltage double insulation or reinforced Protection insulation 600 V U1241B U1242B User s and Service Guide I Regulatory Markings CE ISM 1 A ICES NMB 001 Ge C US The CE mark is a registered trademark The C tick mark is a registered trademark of the European Community This CE of the Spectrum Management Agency of mark shows that the product complies Australia This signifies compliance with with a
35. irements e EC 61010 1 2001 EN61010 1 2001 e USA UL 61010 1 2004 e Canada CSA C22 2 No 61010 1 2004 e TEC 61326 1 2005 EN 61326 1 2006 e Canada ICES NMB 001 2004 e Australia New Zealand AS NZS CISPR11 2004 U1241B U1242B User s and Service Guide VII Declaration of Conformity DoC Vill The Declaration of Conformity DoC for this instrument is available on the Web site You can search the DoC by its product model or description http www keysight com go conformity If you are unable to search for the respective DoC please contact your local Keysight representative U1241B U1242B User s and Service Guide In This Guide 1 Getting Started Chapter 1 introduces key features and steps to get started with a U1241B or U1242B handheld digital multimeter This chapter also guides you through the basics of the front panel operations 2 Features and Functions Chapter 2 contains the information on how to set up connections to perform multimeter measurements It also describes the features and functions that are available in the U1241B and U1242B handheld digital multimeters in step by step instructions 3 Default Setting Configurations Chapter 3 describes on how to change and configure the default setting of the U1241B and U1242B handheld digital multimeters including data logging and other setting features 4 Service and Maintenance Chapter 4 provides the information on the warranty services maintenance procedures
36. istics 69 interference and electrostatic charge When using the multimeter in an environment where electromagnetic interference or significant electrostatic charge is present measurement accuracy may be reduced KEYSIGHT TECHNOLOGIES 6 Specifications and Characteristics DC Specifications Table 6 6 DC specifications with accuracy of of reading No of Least Significant Digit Range Resolution Burden Voltage UMB VAB Voltage 10000mV mwy e 0 09 5 10 000 V 0 001 V S 0 09 2 1000 0 V 0 1 V Ee 0 15 5 1000 0 uA 0 1 uA lt 0 06 V 0 1 3 10000 uA 1 uA lt 0 55 V 0 1 3 100 00 mA 0 01 mA lt 0 18 V 0 2 3 440 0 mal2 0 1mA 0 5 3 1 Input impedance 10 MQ nominal 2 Current can be measured up to 440 mA continuously An additional 0 2 needs to be added to the specified accuracy if the signal measured is in the range of 440 mA to 1100 mA for 30 seconds maximum After measuring current of gt 440 mA leave the multimeter to cool down for twice the measuring time used before application of low current measurement 3 Current can be measured up to 10 A continuously with the maximum operating temperature of 50 C An additional 0 3 needs to be added to the specified accuracy if the signal measured is in the range of 10 A to 19 999 A for 15 seconds maximum After measuring a current of gt 10 A leave the multimeter to cool down for 60 seconds before applying low current measurement 62 U
37. ll the relevant European Legal the Australia EMC Framework Directives regulations under the terms of the Radio Communication Act of 1992 ICES NMB 001 indicates that this ISM No This instrument complies with the WEEE device complies with Canadian gt Directive 2002 96 EC marking ICES 001 requirement This affixed product label indicates that you must not discard this electrical electronic product in domestic household waste The CSA mark is a registered trademark of the Canadian Standards Association Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument Is classified as a Monitoring and Control Instrument product The affixed product label is shown as below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight office or visit www keysight com environment product for more information U1241B U1242B User s and Service Guide General Safety Information The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions
38. ment To avoid damaging the device do not exceed the input limit Measuring DC Voltage Measuring AC Voltage Press st to select AC voltage measurement mode ATV U1241B or H RATIO U1242B V Measuring Current gt 440 mA Measuring DC current Measuring AC current ET 1 I l 10 U1241B U1242B User s and Service Guide Features and Functions 2 Measuring Current lt 440 mA If the measured value is lower than 440 mA use the mA or uA current measurement mode a ay 7 Press _ S _ to select AC current measurement mode C l The scale of 0 20 mA or 4 20 mA is selectable in setup mode The mA scale for 4 20 or 0 20 is indicated on primary display and the bar graph Fe indicates the current value The 25 scale readout represents DC 8 mA at 4 20mA and DC 5 mA at 0 20mA Press Coun at MAAS position U1241B U1242B User s and Service Guide 11 2 Features and Functions Measuring Frequency The frequency measurement is applicable for DC and AC current measurements The bar graph is used to indicate the H RATIO U1242B value a oie voltage Alternatively e button to display the value of AC voltage The multimeter will return to frequency value display automatically after three seconds position Measuring Resistance and Testing Continuity CAUTION Disconnect circuit power and discharge all high voltage capacitors bef
39. nabled AVG the average or mean of all the readings since the MinMax function was enabled MAXMINAVG present reading actual input signal value Refer to the following steps to use the MinMax Recording mode Press a for more than one second to enter the MinMax Recording mode The multimeter is now in the continuous mode or non data hold non trigger mode The beeper sounds when a new maximum or minimum value is recorded Press Choa to scroll through the maximum minimum average and present readings The MAX MIN AVG or MAXMINAVG annunciator lights up correspondingly to the displayed readings Press a for more than one second to exit the MinMax Recording mode The average value is the true average of all measured values taken in the MinMax Recording mode If an overload is recorded the averaging function will stop and the average value becomes OL overload The auto power off feature nee is disabled in MinMax Recording mode U1241B U1242B User s and Service Guide Features and Functions 2 Data Hold Trigger Hold The data hold function allows users to freeze the displayed digital value 1 Press old to freeze the displayed value and to enter manual trigger mode Notice the M l annunciator is displayed 2 Press Coit to trigger the freeze of the next value being measured The alt annunciator will flash before the new value is updated onto the display 3 Press CH a for m
40. ng Configurations 27 Setting Configurations 28 Service and Maintenance 31 General Maintenance 32 Battery Replacement 32 Fuse Replacement 33 Troubleshooting 35 Returning Instrument for Service 37 Performance Tests and Calibration 39 Calibration Overview 40 Closed case Electronic Calibration 40 Calibration Interval 40 Adjustment is Recommended 41 Recommended Test Equipment 42 Basic Operating Test 43 Backlight Test 43 Testing the Display 43 Input A Terminal Test 44 Input mA Terminal Alert Test 44 Calibration Process 44 Test Considerations 45 Input Connections 46 Performance Verification Tests 46 Calibration Security 50 Using the Front Panel for Adjustments 52 Adjustment Considerations 53 Valid Adjustment Input Values 54 Calibration Adjustments 55 Exiting Adjustment Mode 59 Calibration Count 60 Calibration Errors 60 U1241B U1242B User s and Service Guide Contents 6 Specifications and Characteristics 61 DC Specifications 62 AC Specifications 63 Resistance Specifications 64 Diode Check Audible Continuity Test Specifications 64 Temperature Specifications 65 Capacitance Specifications 66 Harmonic Ratio Specifications 66 Frequency Specifications 6 7 Operating Specifications 68 General Characteristics 69 U1241B U1242B User s and Service Guide XII Contents THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK XIII U1241B U1242B User s and Service Guide U1241B and U1242B Handheld Digital Multimeters User s
41. o 20 mA 4 20 mA 4 20 mA Minimum frequency 0 5 Hz 1 Hz Sets the minimum frequency that can be 0 5 Hz can be measured 2 Hz 5 Hz measured in AC measurement mode EA Frequency of beep 3746 Hz Sets frequency of beep sound of the multimeter 3746 Hz sound 2400 Hz 1200 Hz 600 Hz 300 Hz Sets thermocouple type to J type for U1242B tYPE mV Sets 100 mV measurement for T1 input Log Data logging for Enables manual data logging U1242B 1 9999 Sets interval for automatic data logging from 1 to 9999 seconds Press C to toggle through the digit to be adjusted Auto power off Sets timer in minutes for auto power off Disables auto power off Thermocouple Sets thermocouple type to K type tYPE K Lit Backlight timer 1 99 Sets timer in seconds for auto turn off for backlight display Disables auto turn off for backlight display Default AC or DC for Defines the preferred setup of AC or DC for voltage and current voltage and current measurement once For firmware measurements multimeter is turned on version 2 13 and For firmware version 2 14 and above U1241B U1242B User s and Service Guide 29 3 Default Setting Configurations Available setting options Default factory Setup Description Display 2 Reset dFAU Resets the multimeter to the factory settings by pressing and holding r for more than 1 second A beep sound indicates the reset is being done Temperature Sets temperature measurement to C pr
42. or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements WARNING e Do not exceed any of the measurement limits defined in the specifications to avoid instrument damage and the risk of electric shock e Observe all markings on the instrument before connecting any wiring to the instrument When working above 60 VDC 30 VAC RMS or 42 V peak exercise caution such range pose a shock hazard Do not measure more than the rated voltage as marked on the multimeter between terminals or between terminal and earth ground e Double check the multimeter s operation by measuring a known voltage e For current measurement turn off circuit power before connecting the multimeter to the circuit Always place the multimeter in series with the circuit e When connecting probes always connect the common test probe first When disconnecting probes always disconnect the live test probe first e Detach test probes from the multimeter before you open the battery cover e Do not use the multimeter with the battery cover or part of the cover removed or loose e Replace the battery as soon as the low battery indicator flashes on screen This is to avoid false readings which may lead to possible electric shock or personal injury e Do not operate the product in
43. ore measuring resistance to prevent possible damage to the multimeter or the device under test Measurement range Beeper sounds when enable the continuity t Le ara Til ld 10 000 KQ lt 100 Q 1 0000 MQ lt 10 kQ 10 000 MQ lt 100 kQ 12 U1241B U1242B User s and Service Guide Features and Functions 2 button to select measurement range from 1 kQ to 100 MQ Testing Diodes ircui i igh itors before testing diodes t CAUTION Disconnect circuit power and discharge all high voltage capacitors before testing diodes to prevent possible damage to the multimeter Forward bias Reverse bias T it l i amp i ai Ti id The multimeter can display diode forward bias of up to approximately 1 1 V Typical diode forward bias is between the range of 0 3 to 0 8 V range with audible beeper sound U1241B U1242B User s and Service Guide 13 2 Features and Functions Measuring Capacitance CAUTION Disconnect circuit power and discharge all high voltage capacitors before measuring capacitance to prevent possible damage to the multimeter or the device under test To confirm that capacitors have discharged use the DC voltage function Measuring tips e For measuring capacitances greater than 10 000 UF discharge the capacitor and manually select a suitable measurement range This will speed up measuring time in order to obtain the correct capacitance value e Ens
44. ore than one second to exit this mode Refresh Hold Users are required to activate the Refresh Hold in the setup mode 1 Press Choa to enter Refresh Hold mode The present value will be held and the fal annunciator is displayed 2 The multimeter is ready to hold new measuring value once the variation of measuring value exceeds the setting of variation count and the annunciator is flashed 3 The hold value will be updated until the measuring value is stable The annunciator will stop flashing and stays lit an audible tone will sound to remind user 4 Press p again to disable this function e For voltage current and capacitance measurements the holding value will not be updated if the reading is below 50 counts e For resistance and diode measurements the holding value will not be updated if the reading is in OL open state e The holding value may not be updated if the reading does not reach stable state for all measurements U1241B U1242B User s and Service Guide 19 2 Features and Functions Null Relative The Null function subtracts a stored value from the present measurement and displays the difference between the two values 1 Press a i to store the displayed reading as the reference value to be subtracted from subsequent measurements and to set the display to zero The NULL annunciator is displayed 2 Press D to view the stored reference value The NULL annunciator will flash for thre
45. ot perform any service unless you are qualified to do so If the instrument fails to operate check the batteries and test leads replace them if necessary If the instrument still does not function check the identification procedures as described in Table 4 10 Table 4 10 Basic troubleshooting hints Malfunction tdentification No LCD display after power ON e Check the battery polarity and replace batteries if necessary Ensure that the replaced batteries are new batteries it is recommended not to mix old batteries with new batteries U1241B U1242B User s and Service Guide 35 4 Service and Maintenance No beeper tone e Check setup mode and verify if the beeper is set to OFF Then select the desired driving frequency Failed on current measurement e Check the fuse When servicing use the specified replacement parts only The Table 4 11 shows the replacement part numbers Table 4 11 List of replacement part numbers Part number Description 2110 1400 Fast blow fuse 1000 V 0 44 A 10 mm x 35 mm 2110 1402 Fast blow fuse 1000 V 11 A 10 mm x 35 mm U1241 46400 Battery cover without screw 5190 2573 Battery cover screw 36 U1241B U1242B User s and Service Guide Service and Maintenance 4 Returning Instrument for Service Before shipping your instrument for repair or replacement Keysight recommends that you acquire the shipping instructions from the Keysight Technologies Service Center A clear understanding of the shi
46. own in Table 5 3 2 After unsecuring the multimeter the multimeter will go into the adjustment mode see Unsecuring the Multimeter for Calibration 3 The primary display will show the reference value of the Cal Items Configure each Cal Item shown in Valid Adjustment Input Reference Values in Table 5 3 4 Use the 5 Apply the input signal as shown in the Valid Input Reference Value column of the Table 5 3 The bar graph will display the input reading There is no bar graph display for temperature adjustment arrow keys to select the Cal Range Users are highly recommended to complete the adjustments in the same order as shown In Table 5 3 6 Enter the actual applied input see Entering Adjustment Values 7 Press Range to start the adjustments The CAL flashes in the secondary display indicating the calibration is in progress 8 Upon completion of each adjustment value the secondary display will show PAS If the adjustment failed the multimeter will sound a long beep and the calibration error number appears in the secondary display The primary display remains at the current Cal Item If the adjustment failed check the input value range function and entered adjustment value and repeat the adjustment steps U1241B U1242B User s and Service Guide 55 5 Performance Tests and Calibration 9 Turn the rotary switch to the next function according to the Test Function column shown in Table 5 3 Repeat steps 3 to 8 for eac
47. pping instructions is necessary to secure your product for shipment 1 Write the following information on a tag and if attach to the instrument e Name and address of owner e Instrument model number e Instrument serial number e Description of the service required or failure indications Remove all accessories from the instrument Do not include accessories unless they are associated with the failure symptoms Protect the instrument by wrapping it in plastic or heavy paper Pack the instrument in foam or other shock absorbing material and place it in a strong shipping container You are recommended to use the original shipping material or order materials from a Keysight Technologies Sales Office If both options are not available place 8 to 10 cm 3 to 4 inches of shock absorbing and static free packaging material around the instrument to avoid movement during shipping Seal the shipping container securely Mark the shipping container as FRAGILE In the ensuing correspondence refer to the instrument by its model number and full serial number Keysight suggests that you always insure your shipments U1241B U1242B User s and Service Guide 37 4 Service and Maintenance THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 38 U1241B U1242B User s and Service Guide U1241B and U1242B Handheld Digital Multimeter User s and Service Guide 5 Performance Tests and Calibration Calibration Overview 40 Recommended Test Equipmen
48. pport assistance contact us at the fol lowing phone numbers United States tel 800 829 4444 fax 800 829 4433 Canada tel 877 894 4414 fax 800 746 4866 China tel 800 810 0189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 7690800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit the Keysight World Wide Web at www keysight com find assist Product specifications and descriptions in this document are subject to change with out notice Always refer to the English ver sion on the Keysight Web site for the latest revision This information is subject to change without notice Keysight Technologies 2009 2015 Edition 14 June 19 2015 KEYSIGHT U1241 90063 TECHNOLOGIES www keysight com
49. r circuits lt 0 3 A short circuit current The built in buzzer sounds when reading is approximately below 50 mV and audible single tone for normal forward biased diode or semiconductor junction as 0 3 V Reading 0 8 V 64 U1241B U1242B User s and Service Guide Specifications and Characteristics 6 Temperature Specifications Table 6 10 Temperature specifications with accuracy of of reading offset error K 40 C to 1000 C 1 1 C Temperature 40 F to 1832 F 1 1 8 F J 3 40 C to 1000 C 1 1 C 40 F to 1832 F 1 1 8 F 1 The accuracy is specified as following condition The accuracy does not include the tolerance of thermocouple probe The thermal sensor plugged into the multimeter should be placed in the operating environment for at least one hour Use Null function to reduce the thermal effect When measuring temperature with respect to any temperature calibrator set both the calibrator and multimeter with external reference without internal ambient compensation If both calibrator and multimeter are set with internal reference with internal ambient compensation deviation may be shown between the readings of the calibrator and multimeter due to differences in ambient compensation between calibrator and multimeter Do not contact the temperature sensor to any surface that is energized above 33 Vrms or 70 VDC such the voltage source will pose a shock hazard 2
50. ring a signal greater than 440 mA to 1100 mA for 30 seconds maximum After measuring gt 440 mA current cool down the multimeter for twice the measuring time taken before proceed for low current measurement 4 Current can be measured from 0 5 A up to 10 A continuously with the maximum operating temperature of 50 C An addition 0 3 needs to be added to the specified accuracy if the signal measured is in the range of 10 A to 19 999 A for 15 seconds maximum After measuring a current of gt 10 A leave the multimeter to cool down for 60 seconds before applying low current measurement 5 Only available in U1242B 6 The multimeter should be ON for at least 1 hour before measurements are taken The accuracy does not include the tolerance of thermocouple probe When measuring temperature with respect to any temperature calibrator set both the calibrator and multimeter with external reference without internal ambient compensation 0 C If both calibrator and multimeter are set with internal reference with internal ambient compensation deviation may be present between the readings of the calibrator and multimeter U1241B U1242B User s and Service Guide 49 5 Performance Tests and Calibration Calibration Security 50 The calibration security code prevents accidental or unauthorized adjustments to the multimeter The multimeter is secured when the multimeter is shipped from factory Before performing any adjustment to the multime
51. sers are highly recommended to read the Test Considerations before performing performance verification tests U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Table 5 2 Verification Tests ad Test Function Range 5520A Output Error from nominal 1 year Lune uae 1 Turn the rotary switch to ATV 1000 mV 1000 0 mV t 1 4 mV position 10 V 10 000 V 11 mV 100 V 100 00 V 110 mV 1000 V 1000 0 V 2V 2 Press Cnn gt to go to Na V function 1000 mV 1000 0 mV 500 Hz 10 5 mV 1000 0 mV 1 kHz 20 5 mV 10V 10 000 V 500 Hz 105 mV 10 000 V 1 kHz 105 mV 10 000 V 2 kHz 205 mV 100 V 100 00 V 500 Hz 1 05 V 100 00 V 1 kHz 1 05 V 100 00 V 2 kHz 2 05 V 1000 V 1000 0 V 1 kHz 10 5 V 3 Press Hz to go to frequency mode 100 Hz 1 000 V 70 Hz 51 mHz 1000 Hz 1 000 V 1000 Hz 600 mHz 10 kHz 1 000 V 2 kHz 3 6 Hz U1241B U1242B User s and Service Guide 47 5 Performance Tests and Calibration a Ja fo Test Function Range Turn the rotary switch to position 1000 Q 10 kQ 100 kQ 1000 kQ 10 MQ 100 MQ Turn the rotary switch to f position 1000 nF 10 uF 100 uF 1000 uF 10 mF Turn the rotary switch to LA AS 1000 uA position 10000 uA Press Cnn gt to goto N UA 1000 uA function 10000 uA Turn the rotary switch to mA 7z 100 mA position 440 mA Press Co to go to N mA 100 mA function 440 mA 5520A Output 1000 0 Q 10
52. shing use or performance of this document or of any information contained herein Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accor dance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Soft ware and technical data rights granted to the federal government include only those rights customarily provided to end user cus tomers Keysight provides this customary commercial license in Software and techni cal data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Computer Software or Com puter Software Documentation Safety Notices CAUTION A CAUTION notice denotes a haz ard It calls attention to an operat ing procedure practice or the like that if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met A WARNING notice denotes a hazard It calls attention to an operat
53. t to select the last record for quick navigation 3 Press Com gt to switch between hand manual and interval automatic logging review mode 4 Press D View for more than one second to exit Log View mode Removing Logged Data Press Log for more than one second at the respective Log Review mode hand or interval to clear all logged data in the memory Scanning Temperature Measurement U1242B This scanning temperature measurement function allows users to measure U1241B U1242B User s and Service Guide 23 2 Features and Functions and display temperature T1 T2 and T1 T2 sequentially 1 Press and hold 4 amp 4 D Scan button for more than one second to enable Scan mode Notice the multimeter will scan through and display the value of T1 T2 and T1 T2 periodically 2 The multimeter will set to the states for T1 T2 or T1 T2 when you disabled Scan mode by pressing Gn L Scan for more than one second Checking Battery Capacity The battery sign will flash when the battery voltage drops below 4 4 V Once the low battery sign is displayed it is highly recommended to replace the batteries immediately See Battery Replacement in chapter 4 To check the battery capacity see the following steps 1 Press C gt Bat for more than one second to view the battery capacity The multimeter will resume back to normal function automatically after three seconds 2 The primary display illustrates the flashin
54. t 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications lt 1 5 instrument 1 year specifications Shorting Plug Dual banana plug with copper lt 1 5 instrument 1 year specifications wire short between 2 terminals U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Basic Operating Test Basic Operating Test is used to test the basic operability of the multimeter Repair is required if the multimeter fails the Basic Operating Test Backlight Test momentarily to turn backlight ON at medium level of brightness intensity Press again to toggle the high est level of brightness intensity The backlight turns OFF automatically To test the backlight function press after setting period Alternatively you can press 2 for the third time to turn the backlight OFF Testing the Display To view all segments of the display press and hold the Choa button while turning the rotary switch from OFF to any non OFF position Compare the display with the Figure 5 1 sm SA AAT AUTO gt t Gah 7 MAXMINAVG N NULL Jk lala if me mAVF a MkQHz o 10000 Ay en Paaa ee Ena fa A oa iiaiai niii ial OFF Figure 5 1 Annunciator display U1241B U1242B User s and Service Guide 43
55. t 42 Basic Operating Test 43 Calibration Process 44 Test Considerations 45 Performance Verification Tests 46 Calibration Security 50 Adjustment Considerations 53 Calibration Adjustments 55 Calibration Count 60 Calibration Errors 60 This chapter contains procedures of performance verification tests and calibration adjustments The performance tests is meant to verify the U1241B or U1242B handheld digital multimeter to ensure the multimeter is operating within its published specifications KEYSIGHT TECHNOLOGIES 5 Performance Tests and Calibration Calibration Overview 40 Ensure that you have read Test Considerations before calibrating the multimeter Closed case Electronic Calibration The multimeter features closed case electronic calibration No internal mechanical adjustments are required The multimeter calculates correction factors based upon the input reference value you set The new correction factors are stored in non volatile memory until the next calibration adjustment is performed Non volatile EEPROM calibration memory does not change when power has been off Calibration Interval A 1 year interval is adequate for most applications Accuracy specifications are warranted only if adjustment is made at regular calibration intervals Accuracy specifications are not warranted beyond the l year calibration interval Keysight does not recommend extending calibration intervals beyond 2 years for any application U1
56. tage Measurement 2 InputRange y Range Minimum Sensitivity R M S sine wave EE input for specified accuracy 50 kHz to 200 kHz 10 x Range or 1000 V 100 00 V 10 V lt 100 kHZ 1000 0 V 100 V lt 100 kHZ Frequency Sensitivity During Current Measurement Input Range Minimum Sensitivity R M S Sine wave 1000 0 uA 100 uA 1 The input signal is lower than the product of 20 000 000 V Hz 2 For the accuracy of the maximum input refer to AC voltage specifications 3 For the accuracy of the maximum input refer to AC current specifications U1241B U1242B User s and Service Guide 67 6 Specifications and Characteristics Operating Specifications Table 6 14 Measuring rate of U1241B and U1242B Funcion Tne esond 68 U1241B U1242B User s and Service Guide Specifications and Characteristics 6 General Characteristics Table 6 15 General characteristics of U1241B and U1242B Power Supply 4 single standard 1 5 V AAA batteries Alkaline or Zinc Chloride type Display Dual display secondary display is cater for temperature function display only are 4 digit liquid crystal display LCD with maximum reading of 11 000 counts Automatic polarity indication Power Consumption 0 22 VA maximum Operating Environment Full accuracy at 10 C to 55 C Full accuracy to 80 R H for temperature up to 30 C decreasing linearly to 50 R H at 55 C Storage Environment 20 C to 70 C with battery
57. ter you are required to unsecure the multimeter by entering the correct security code see Unsecuring the Multimeter for Calibration The security code may contain up to 4 numeric characters You can unsecure and change the security code from the multimeter front panel If you forget your security code see Unsecuring the Multimeter Without the Security Code Unsecuring the Multimeter for Calibration Before performing adjustment to the multimeter you are required to unsecure the multimeter by entering the correct security code The security code is set to 1234 when the multimeter is shipped from the factory The security code is stored in non volatile memory and does not change when power is off Unsecuring the Multimeter from the Front Panel 1 Turn the rotary switch to ASV i 2 Press C and C simultaneously to enter the Calibration Security Code entry mode The primary display shows 5555 and the secondary display shows SEU If the correct security code is entered the secondary display will show PAS If an invalid code is entered the multimeter will shows error code E02 on the secondary display for approximately 3 seconds and return to the Calibration Security entry mode U1241B U1242B User s and Service Guide Performance Tests and Calibration 5 Changing the Multimeter Calibration Security Code from the Front Panel 1 When the multimeter is in the unsecured mode press Cnn gt button for more than one
58. trained personnel If necessary return the product to Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained Turn off circuit power and discharge all high voltage capacitors in the circuit before you perform resistance continuity diodes or capacitance tests Use the correct terminals function and range for your measurements Never measure voltage when current measurement is selected Ensure proper insertion of battery in the multimeter and follow the correct polarity You are advised to use low leakage batteries when changing to new batteries Please remember to remove the batteries when the multimeter is not in use for a long period of time Warning on the risk of battery leakage U1241B U1242B User s and Service Guide Environment Conditions This instrument is designed for indoor use in areas with low condensation and to be used with standard or compatible test probes Environment Conditions Requirements Operating environment Full accuracy at 10 C to 55 C Operating relative humidity Full accuracy up to 80 RH for temperature up to 30 C decreasing linearly to 50 RH at 55 C Storage environment 20 C to 70 C Altitude 0 2000 meters per IEC 61010 1 2 Edition CAT Ill 1000 V CAT IV 600 V Pollution Degree Pollution Degree II CAUTION The Keysight U1241B and U1242B are safety certified in compliance with the following safety and EMC requ
59. ure the correct polarity when measuring polarized capacitors e For measuring small capacitances press 4 with the test leads open to subtract the residual capacitance of the multimeter and leads Measuring Temperature e Do not bend the thermocouple leads at sharp angles Repeated bending over a CAUTION period of time can break leads e Do not contact the temperature sensor to any surface that is energized voltage or current sources such the voltage source will pose a shock hazard 14 U1241B U1242B User s and Service Guide at T1T2 U1242B position to enable T2 Features and Functions 2 Measuring tips e Clean the measurement surface and remember to disable the applied power e When measuring temperature move the thermocouple along the surface until you get the highest lowest temperature reading e For quick measurement use the 0 C compensation to see the temperature variation of the thermocouple sensor The 0 C compensation assists you in measuring relative temperature If you are working in a varied environment where ambient temperature is not constant do the following 1 Press Change for more than one second to enable 0 C compensation This function allows a quick measurement of the relative temperature 2 Avoid contact between the thermocouple probe and the measurement surface 3 After a constant reading is obtained press n to set the reading as the rel

Keysight U1241B and U1242B Handheld Digital Multimeters

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