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Agilent U1251A and
U1252A
Handheld Digital
Multimeter
User’s and Service Guide
Agilent Technologies
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Notices © Agilent Technologies, Inc. 2006 – 2012 Warranty Safety Notices No part of this manual may be reproduced in The material contained in this docu- any form or by any means (including elec- ment is provided “as is,” and is sub- tronic storage and retrieval or translation CAUTION ject to being changed, without notice, into a foreign language) without prior agree- in future editions. Further, to the max- ment and written consent from Agilent A CAUTION notice denotes a haz- imum extent per
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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. CAT IV CAT III Category III 1000 V overvoltage protection Category IV 600 V overvoltage protection 1000 V 600 V Equipment protected throughout by double insulation or reinforced Earth (ground) terminal insulation Caution, risk of danger (refer to this manual Caution, risk of electric shock for specific Warning or Caution informat
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Safety Information This meter is safety-certified in compliance with EN/IEC 61010-1:2001, UL 61010-1 Second Edition and CAN/CSA 22.2 61010-1 Second Edition, CAT III 1000 V/ CAT IV 600 V Overvoltage Protection, Pollution Degree II. Use with standard or compatible test probes. 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 or with specific warnin
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� When working above 70 VDC, 33 VAC RMS or 46.7 V peak, exercise caution – such WARNING range pose a shock hazard. � Do not measure more than the rated voltage (as marked on the meter) between terminals, or between terminal and earth ground. � Double-check the meter’s operation by measuring a known voltage. � For current measurement, turn off circuit power before connecting the meter to the circuit. Always place the meter in series with the circuit. � When connecting probes, always connect t
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� Turn off the circuit power and discharge all high-voltage capacitors in the circuit before CAUTION 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. � Use only recommended rechargeable battery. Ensure proper insertion of battery in the meter, and follow the correct polarity. � Disconnect test leads from all the terminals during battery charging
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Regulatory Markings The C-tick mark is a registered The CE mark is a registered trademark trademark of the Spectrum of the European Community. This CE Management Agency of Australia. This mark shows that the product complies signifies compliance with with all the relevant European Legal the Australia EMC Framework Directives. regulations under the terms of the Radio Communication Act of 1992. This instrument complies with the ICES/NMB-001 indicates that this ISM WEEE Directive (2002/96/EC)
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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 as shown below. Do
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In This Guide… 1Getting Started This chapter contains information on the Agilent U1251A and U1252A handheld multimeter front panel, rotary switch, keypad, display, terminals and rear panel. 2 Making Measurements This chapter contains information on how to make measurements using the U1251A and U1252A handheld digital multimeter. 3 Functions and Features This chapter contains information on the functions and features that are available for the U1251A and U1252A digital multimeter. 4 Changing
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Declaration of Conformity (DoC) 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://regulations.corporate.agilent.com/DoC/search.htm NOTE If you are unable to search for the respective DoC, please contact your local Agilent representative. X Agilent U1251A/U1252A User’s and Service Guide
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III Contents 1 Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter 2 Check the shipment 3 Adjusting the tilt-stand 4 The rear panel at a glance 7 The keypad at a glance 9 The display at a glance 11 Selecting display with the Hz button 16 Selecting display with the Dual button 18 Selection display with the Shift button 20 The terminals at a glance 22 2 Making Measurements Understanding The Measurement Instructions 24 Measuring Voltage 24 Measurin
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III Overload alert 47 Input warning 47 Charge terminal alert 48 3 Functions and Features Dynamic Recording 50 Data Hold (Trigger Hold) 52 Refresh Hold 53 Null (Relative) 55 Decibel Display 57 1 ms Peak Hold 59 Data Logging 61 Manual logging 61 Interval logging 63 Reviewing logged data 65 Square Wave Output (for U1252A) 67 Remote Communication 71 4 Changing The Default Setting Selecting Setup Mode 74 Setting Data Hold/Refresh Hold Mode 77 Setting Data Logging Mode 78 Setting Thermocouple Types (U
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III Setting Beep Frequency 87 Setting Backlight Timer 88 Setting Baud Rate 89 Setting Parity Check 90 Setting Data Bit 91 Setting Echo Mode 92 Setting Print Mode 93 Returning to Default Factory Settings 94 5 Maintenance Introduction 96 General maintenance 96 Battery replacement 96 Storage considerations 98 Charging the battery 98 Fuse checking procedure 105 Replacing the fuse 106 Troubleshooting 108 Replaceable Parts 109 To order replaceable parts 109 6 Performance Tests and Calibration Calibrat
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III Testing the display 115 Current terminal test 116 Charge terminal alert test 117 Test Considerations 118 Calibration Security 119 Performance Verification Tests 120 Unsecuring the instrument for calibration 128 Calibration process 131 Using the front panel for adjustments 132 Adjustments Consideration 133 Valid adjustment input values 134 Adjustment procedure 135 Finishing the adjustment 142 To read the calibration count 142 Calibration errors 143 7 Specifications Prod
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III Peak Hold Specifications 159 Frequency Counter Specifications for U1252A 160 Square Wave Output for U1252A 161 Operating Specifications 162 Display update rate (approximate) 162 Input impedance 163 Abbreviated Book Title Variable (Edit this) XVII
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III XVIII Abbreviated Book Title Variable (Edit this)
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List of Figures Figure 1-1 Tilt-stand at 60° 4 Figure 1-2 Tilt-stand at 30° 4 Figure 1-3 Tilt-stand at hanging position 5 Figure 1-4 U1252A front panel 6 Figure 1-5 Rear panel 7 Figure 1-6 Rotary switch 8 Figure 1-7 U1252A keypad 9 Figure 1-8 Display symbols 11 Figure 1-9 U1252A connector terminals 22 Figure 2-1 Measuring AC voltage 25 Figure 2-2 Measuring DC voltage 26 Figure 2-3 Measuring mA and mA current 28 Figure 2-4 Measuring scale of 4-20 mA 30 Figure 2-5 A (ampere) current measurement 31
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Figure 3-8 Full Log 62 Figure 3-9 Interval (Automatic) logging mode operation 64 Figure 3-10 Log review mode operation 66 Figure 3-11 Frequency adjustment for square wave output 68 Figure 3-12 Pulse width adjustment for square wave output 69 Figure 3-13 Duty cycle adjustment for Square Wave 70 Figure 3-14 Cable connection for remote communication 71 Figure 4-1 Data hold/Refersh hold setup 77 Figure 4-2 Data logging setup 78 Figure 4-3 Thermocouple type setup 79 Figure 4-4 Reference impedance for
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II List of Tables Table 1-1 Rotary switch description and functions 8 Table 1-2 Keypad desciption and functions 9 Table 1-3 General display symbols 12 Table 1-4 Priamry display symbols 13 Table 1-5 Secondary display symbols 14 Table 1-6 Analog bar range and counts 15 Table 1-7 Selecting display with the Hz button 16 Table 1-8 Selecting display with the Dual button 18 Table 1-9 Selecting display with the Shift button 20 Table 1-10 Terminal connections for different measuring functions 22 Table 2
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II Table 7-7 U1252A true RMS ac+dc current specifications 155 Table 7-8 Capacitance specifications 156 Table 7-9 Temperature specifications 156 Table 7-10 Frequency specifications 157 Table 7-11 Duty cycle and pulse width specifications 157 Table 7-12 Frequency sensitivity and trigger level specifications for voltage measurements 158 Table 7-13 Frequency sensitivity specifications for current measurements 159 Table 7-14 Peak hold specifications for dc voltage and current measurements 159 Tabl
