Keysight U1211A, U1212A, U1213A User's And Service Manual

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Keysight U1211A, U1212A, and U1213A Clamp Meters

User’s and Service Guide

Notices

CAUTION

WARNING

reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws.

Manual Part Number

U1211-90001

Edition

Edition 16, June 30, 2017

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies Bayan Lepas Free Industrial Zone, 11900 Penang, Malaysia

Technology Licenses

The hard ware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

Declaration of Conformity

Declarations of Conformity for this product and for other Keysight products may be downloaded from the Web. Go to http://www.keysight.com/

go/conformity. You can then search by

product number to find the latest Declaration of Conformity.

U.S. Government Rights

The Software is “commercial computer software,” as defined by Federal Acquisition Regulation (“FAR”) 2.101. Pursuant to FAR 12.212 and 27.405-3 and Department of Defense FAR Supplement (“DFARS”) 227.7202, the U.S. government acquires commercial computer software under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA), a copy of which can be found at http://www.keysight.com/find/

sweula. The license set forth in the

EULA represents the exclusive authority by which the U.S. government may use, modify, distribute, or disclose the Software. The EULA and the license set forth therein, does not require or permit, among other things, that Keysight: (1) Furnish technical information related to commercial computer software or commercial computer software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial computer software or commercial computer 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 pursuant to the FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR

12.211 and 27.404.2 and DFARS

227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR 27.401 or DFAR

227.7103-5 (c), as applicable in any technical data.

Warranty

THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED “AS IS,” AND IS SUBJECT TO BEING CHANGED, WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, KEYSIGHT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH REGARD TO THIS MANUAL AND ANY INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEYSIGHT SHALL NOT BE LIABLE FOR ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, 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.

Safety Information

A CAUTION notice denotes a hazard. It calls attention to an operating 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 operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

2 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Safety Symbols

CAT III

CAT IV 600 V

The following symbols on the instrument and in the documentation indicate precautions that must be taken to maintain safe operation of the instrument.

Direct current (DC) Caution, risk of electric shock

Alternating current (AC)

Earth (ground) terminal

Caution, risk of danger (refer to this manual for specific Warning or Caution information)

Equipment protected throughout by double insulation or reinforced insulation

Category III 1000 V overvoltage protection

Category IV 600 V overvoltage protection

Application around and removal from HAZARDOUS LIVE conductors is permitted

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 3

General Safety Information

WARNING

– Do not exceed any of the measurement limits defined in the specifications

to avoid instrument damage and the risk of electric shock.

– When working above 30 V

range poses a shock hazard.

– Do not measure more than the rated current and voltage (as marked on

the clamp meter).

– Ensure the test leads are disconnected from the input terminals when

measuring current with the clamp meter. Keep your fingers behind the hand guard when performing measurements.

– When connecting probes, always connect the common test probe first.

When disconnecting probes, always disconnect the live test probe first.

– Detach test probes from the clamp meter before you open the battery

cover.

– Do not use the clamp meter with the battery cover or part of the cover

removed or loose.

– Replace the battery as soon as the low battery indicator is shown on the

annunciator display. This is to avoid false readings, which may lead to possible electric shock or personal injury.

– When measuring temperature, keep the thermocouple probe as close to

the meter as possible, and avoid contact with surface above 30 V or 60 V

– Do not operate the product in an explosive atmosphere or in the presence

of flammable gases or fumes.

– Inspect the case for cracks or missing plastic. Pay extra attention to the

insulation surrounding the connectors. Do not use the clamp meter if it is damaged.

– 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 service or perform adjustments alone. Under certain condition,

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.

as this will pose shock hazard.

RMS or 60 VDC, exercise caution – such

RMS

4 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

WARNING

– Do not substitute parts or modify equipment to avoid the danger of

CAUTION

introducing add itional hazards. Return the product to the nearest 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-trained personnel. If necessary, return the product to the nearest 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 and capacitance measurements or continuity and diode tests.

– Use the correct terminals, function, and range for your measurements.

– Never measure voltage when current measurement is selected.

– Use only the recommended battery type. Ensure proper insertion of

battery in the clamp meter, and follow the correct polarity.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 5

Use the clamp meter only as specified in this guide. Otherwise, the protection provided by the clamp meter may be impaired.

Measurement Category

The Keysight U1211A, U1212A, and U1213A has a safety rating of CAT III, 1000 V and CAT IV, 600 V.

Measurement CAT I Measurements performed on circuits not directly

connected to the AC mains. Examples are measurements on circuits not derived from the AC mains and specially protected (internal) mains-derived circuits.

Measurement CAT II Measurements performed on circuits directly connected

to a low-voltage installation. Examples are measurements on household appliances, portable 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 installation.

Measurement CAT IV Measurements performed at the source of the

low-voltage installation. Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units.

6 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Environmental Conditions

This instrument is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument.

Environmental conditions Requirements

Operating temperature –10 °C to 50 °C

Relative humidity

Altitude (operating) 2000 meters

Storage temperature –20 °C to 60 °C

Storage humidity 0% to 80% RH non-condensing

Maximum 80% RH for temperature up to 31 °C decreasing linearly to 50% RH at 50 °C

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 7

Regulatory Markings

The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives.

The CSA mark is a registered trademark of the Canadian Standards Association.

ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001. Cet appareil ISM est conforme a la norme NMB-001 du Canada.

The RCM mark is a registered trademark of the Spectrum Management Agency of Australia. This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992.

This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use. Forty years is the expected useful life of the product.

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.

8 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC

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 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 on the following Keysight websites:

– www.keysight.com/find/clampmeter

(product-specific information and support, software and documentation updates)

– www.keysight.com/find/assist

(worldwide contact information for repair and service)

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 9

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10 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

General Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Measurement Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Waste Electrical and Electronic Equipment (WEEE) Directive

2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Product category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

1 Getting Started

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Standard purchase items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Product at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

The front panel at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

The annunciator display at a glance . . . . . . . . . . . . . . . . . . . . . . . . .24

The buttons at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

The rotary switch at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

The terminals at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

The clamp jaw at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

The rear panel at a glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

2 Making Measurements

Performing Current Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Performing Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Performing Resistance Measurement and Continuity Test . . . . . . . . . .40

Performing Diode Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Performing Capacitance Measurement . . . . . . . . . . . . . . . . . . . . . . . . .46

Performing Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . .48

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 11

3 Functions and Features

Data Hold (Trigger Hold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Enabling the data hold function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Refresh Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Enabling the refresh hold function . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Dynamic Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Enabling the dynamic recording mode . . . . . . . . . . . . . . . . . . . . . . . 56

1 ms Peak Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Enabling the 1 ms peak hold function . . . . . . . . . . . . . . . . . . . . . . . 59

Null (Relative) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Enabling the null operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4 Changing the Default Settings

Selecting Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Default Factory Settings and Available Setting Options . . . . . . . . . . . . 66

Setting minimum frequency measurement . . . . . . . . . . . . . . . . . . . 68

Setting beep frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Setting Data Hold/Refresh Hold mode . . . . . . . . . . . . . . . . . . . . . . 70

Setting auto power-off mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Setting backlight power-on duration . . . . . . . . . . . . . . . . . . . . . . . . 72

Setting temperature unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Returning to default factory settings . . . . . . . . . . . . . . . . . . . . . . . . 75

5Maintenance

General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

To order replacement parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

6 Performance Tests and Calibration

Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Closed-case electronic calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 84

12 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight Technologies calibration services . . . . . . . . . . . . . . . . . . . .84

Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Adjustment recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Basic Operating Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Testing the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Testing the backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Input connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Functional tests (only for U1212A and U1213A) . . . . . . . . . . . . . . .94

Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Unsecuring the instrument for calibration . . . . . . . . . . . . . . . . . . . .97

Adjustment Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Valid adjustment reference input values . . . . . . . . . . . . . . . . . . . . .101

Front Panel Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

Calibration process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

Adjustment procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Adjustment count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

7 Characteristics and Specifications

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14 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

List of Figures

Figure 1-1 Keysight U1211A, U1212A, and U1213A Clamp

Figure 1-2 Clamp meter front panel . . . . . . . . . . . . . . . . . . . . . . .23

Figure 1-3 LCD annunciator display with full segments

Figure 1-4 Hold/Max Min button . . . . . . . . . . . . . . . . . . . . . . . . . .27

Figure 1-5 Function and status buttons . . . . . . . . . . . . . . . . . . . .28

Figure 1-6 Clamp meter rotary switch . . . . . . . . . . . . . . . . . . . . . .30

Figure 1-7 Clamp meter terminal inputs . . . . . . . . . . . . . . . . . . . .31

Figure 1-8 Clamp jaw close and open state . . . . . . . . . . . . . . . . .32

Figure 1-9 Clamp meter rear panel . . . . . . . . . . . . . . . . . . . . . . . .33

Figure 2-1 Measuring current . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Figure 2-2 Measuring voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Figure 2-3 Measuring resistance . . . . . . . . . . . . . . . . . . . . . . . . . .41

Figure 2-4 Continuity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Figure 2-5 Measuring diode (forward bias) . . . . . . . . . . . . . . . . . .44

Figure 2-6 Measuring diode (reverse bias) . . . . . . . . . . . . . . . . . .45

Figure 2-7 Measuring capacitance . . . . . . . . . . . . . . . . . . . . . . . .47

Figure 2-8 Measuring temperature . . . . . . . . . . . . . . . . . . . . . . . .49

Figure 3-1 Data hold operation . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Figure 3-2 Refresh hold operation . . . . . . . . . . . . . . . . . . . . . . . . .55

Figure 3-3 Dynamic recording mode . . . . . . . . . . . . . . . . . . . . . . .58

Figure 3-4 1 ms peak hold mode operation . . . . . . . . . . . . . . . . .60

Figure 3-5 Null (relative) mode operation . . . . . . . . . . . . . . . . . . .62

Figure 4-1 Setting the minimum frequency . . . . . . . . . . . . . . . . .68

Figure 4-2 Setting the beep frequency . . . . . . . . . . . . . . . . . . . . .69

Figure 4-3 Setting the data hold or refresh hold mode . . . . . . . .70

Figure 4-4 Setting the auto power-off duration . . . . . . . . . . . . . .71

Figure 4-5 Setting the backlight power-on duration . . . . . . . . . .72

Figure 4-6 Setting the temperature unit . . . . . . . . . . . . . . . . . . . .74

Figure 4-7 Reverting to default factory settings . . . . . . . . . . . . . .75

Figure 5-1 Replacing the battery in the clamp meter . . . . . . . . . .80

Figure 6-1 Full segments of annunciator display . . . . . . . . . . . . .87

Figure 6-2 Current performance verification test setup . . . . . . . .93

Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 15

Figure 6-3 Typical adjustment process flow . . . . . . . . . . . . . . . . 108

Figure 6-4 Displaying adjustment counts . . . . . . . . . . . . . . . . . . 114

16 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

List of Tables

Table 1-1 U1211A, U1212A, and U1213A annunciator display .24

Table 1-2 Analog bar-graph ranges . . . . . . . . . . . . . . . . . . . . . . .26

Table 1-3 Hold/Max Min button description . . . . . . . . . . . . . . . .27

Table 1-4 Terminal connections for different measurement

functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Table 4-1 Setup mode buttons operation . . . . . . . . . . . . . . . . . .64

Table 4-2 Default factory settings and available setting options

for each feature . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Table 5-1 Basic troubleshooting procedures . . . . . . . . . . . . . . . .81

Table 5-2 Replacement parts list . . . . . . . . . . . . . . . . . . . . . . . . .82

Table 6-1 Recommended test equipment . . . . . . . . . . . . . . . . . .86

Table 6-2 Performance verification tests . . . . . . . . . . . . . . . . . . .90

Table 6-3 DC current offset verification test . . . . . . . . . . . . . . . .94

Table 6-4 AC current balancing verification test . . . . . . . . . . . . .96

Table 6-5 U1211A valid adjustment reference input values . . .101 Table 6-6 U1212A valid adjustment reference input values . . .102 Table 6-7 U1213A valid adjustment reference input values . . .103

Table 6-8 U1211A list of adjustment items . . . . . . . . . . . . . . . .109

Table 6-9 U1212A list of adjustment items . . . . . . . . . . . . . . . .110

Table 6-10 U1213A list of adjustment items . . . . . . . . . . . . . . . .112

Table 6-11 Error codes and their respective meanings . . . . . . . .115

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18 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, and U1213A Clamp Meters User’s and Service Guide

1 Getting Started

Introduction 20 Initial Inspection 22 Product at a Glance 23

This chapter contains a brief introduction and description of the front panel, display, buttons, and terminals on the Keysight U1211A, U1212A, and U1213A Clamp Meters.

1 Getting Started

U1211A U1212A U1213A

Introduction

The Keysight U1211A, U1212A, and U1213A Clamp Meters are true RMS handheld clamp meters that enables you to measure harmonic currents accurately. Besides measuring current, the clamp meters are combined with built-in multimeter measurement features to enable other measurements associated to a multimeter.

All the clamp meter models are able to measure AC current, AC and DC voltage, resistance, audible continuity, diode, capacitance, and frequency. The U1212A has additional DC current and temperature measurement functions. The U1213A has additional AC + DC current, AC + DC voltage, and duty cycle tests apart from the additional measurement features from the U1212A.

Figure 1-1 Keysight U1211A, U1212A, and U1213A Clamp Meters

20 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Features

The key features of Keysight U1211A, U1212A, and U1213A Clamp Meters are:

– AC, DC, and AC+DC (for U1213A only) voltage and current measurements.

– True RMS measurement for both AC voltage (ACV) and AC current (ACA).

–Orange LED backlight.

– Resistance measurement up to 40 MΩ (for U1213A only).

– Capacitance measurement up to 4000 µF.

– Frequency measurement up to 200 kHz.

– 1 ms peak hold to capture in-rush voltage and current easily.

– Diode and audible continuity tests.

– K-type thermocouple for temperature measurement.

– Frequency and duty cycle measurements.

– Dynamic recording for min, max, and average readings.

– Data hold with manual trigger and null mode.

– Hand guard to prevent contact with conductors.

Getting Started 1

– Closed case calibration (except for U1212A and U1213A where open case

calibration is needed for balance adjustment).

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 21

1 Getting Started

Initial Inspection

When you first receive your instrument, inspect the unit for any obvious damage such as broken terminals or cracks, dents, and scratches on the casing that may occur during shipment.

If any damage is found, notify the nearest Keysight Sales Office immediately. The front of this manual contains the warranty information.

Standard purchase items

Verify that you have received the following items with your unit. If anything is missing or damaged, please contact the nearest Keysight Sales Office.

✔ Standard test leads with 4 mm probes

✔ Soft carrying case

✔ Keysight U1211A, U1212A, and U1213A Clamp Meter Quick Start Guide

✔ Certificate of Calibration

Keep the original packaging in case the clamp meter has to be returned to Keysight in the future. If you return the clamp meter for service, attach a tag identifying the owner and model number. Also, include a brief description of the problem occurred.

22 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Product at a Glance

Jaw markings

Clamp jaw

Hand guard

Handle

Annunciator

Black input terminal

Red input terminal

Hold/ Max Min button

Rotary switch

Front panel

Function buttons

Getting Started 1

The front panel at a glance

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 23

Figure 1-2 Clamp meter front panel

1 Getting Started

The annunciator display at a glance

Figure 1-3 LCD annunciator display with full segments displayed

The U1211A, U1212A, and U1213A clamp meters annunciator display indicates the measurement values, functions, and status of the clamp meter. To view the full display (with all segments illuminated), press and hold Hold/Max Min while rotating the rotary switch to ~A on the clamp meter. After you are done viewing the full display, press and hold Hold/Max Min. again to resume normal operation.

Tab le 1- 1 U1211A, U1212A, and U1213A annunciator display

No. Annunciator Description

1 AUTO Auto ranging

3 DH Data hold

4 MAX AVG MIN Dynamic recording mode on present reading. MAX: maximum reading,

5 Direct current or voltage

6 Alternating current or voltage

Zeroing mode

MIN: minimum reading, AVG: average reading

24 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Getting Started 1

Tab le 1-1 U1211A, U1212A, and U1213A annunciator d isplay (continued)

No. Annunciator Description

7 Capacitor measurement unit

8 Audible continuity indicator

9 A Current measurement unit

10 Low battery indicator when battery voltage drops below 6.0 V

11 V Voltage measurement unit

12 M k Ω Resistance measurement unit and range

13 Diode measurement indicator

14 % Duty cycle (for U1213A only)

15 kHz Frequency measurement unit

16 Secondary display (for frequency and duty cycle measurement, and temperature unit)

17 Analog bar-graph with scale indicator

18 Auto power-off enabled

19 Negative polarity

20 Primary display

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 25

1 Getting Started

Analog bar-graph

The analog bar-graph emulates the needle on an analog meter without displaying the overshoot. When measuring peak or null adjustments and viewing fast-changing inputs, the bar graph provides a useful indication because it has a faster updating rate to cater for fast-response applications. The bar-graph is not applicable for temperature measurement. A negative sign will be indicated whenever a negative value is measured. Each segment of the analog bar-graph is represented by a count of 100.

Tab le 1- 2 Analog bar-graph ranges

Measurement range Bar-graph display

0 to 1000

1000 to 2000

2000 to 3000

3000 to 4000

26 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

The buttons at a glance

The operation of each button is shown below. Pressing a key changes the current operation, changes the status in the annunciator on the display, and generates a button-click sound (a beep).

Using the Hold/Max Min button

Figure 1-4 Hold/Max Min button

The Hold/Max Min button on the clamp meter has two functions: data hold and dynamic recording. See “Data Hold (Trigger Hold)” on page 52 and “Dynamic

Recording” on page 56 for more information.

Getting Started 1

Tab le 1-3 Hold/Max Min button description

Button Description

– Press Hold/Max Min momentarily to perform data hold operation. The annunciator display

will indicate DH, which means a reading has been freezed. Press and hold Hold/Max Min for more than 1 second to disable data hold operation.

– Press Hold/Max Min for more than 1 second (with the data hold function turned off) to

perform dynamic recording mode. The annunciator display will first indicate MAX AVG MIN. Press Hold/Max Min momentarily to cycle through dynamic recording (maximum, minimum, or average) functions. Press and hold Hold/Max Min for more than 1 second to disable dynamic recording function.

In Setup mode, the Hold/Max Min button is designated as a Save button. See

“Selecting Setup Menu” on page 64 for more information.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 27

1 Getting Started

Primary functions

Secondary functions

Using the clamp meter buttons

Figure 1-5 Function and status buttons

The buttons located between the annunciator display and input terminals have two functions: the primary functions (labels printed above the buttons) and secondary functions (labels printed below the buttons). The primary function is accessible by pressing the button momentarily, while the secondary function is

accessible by pressing the button for more than 1 second. Only do not have secondary function.

Button Description

28 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

– Press Shift/Peak momentarily to perform a shifted function. The shifted function is mostly

used with the rotary switch to cycle between measurement functions. See “The rotary switch at

a glance” on page 30 for more information.

– Press Shift/Peak for more than 1 second to perform Peak function. See “1 ms Peak Hold” on

page 59 for more information.

– Press Hz/%/ momentarily to enable frequency measurement on the secondary display in

the annunciator display.

– Press Hz/%/ momentarily again (after enabling frequency measurement) to perform duty

cycle (%)

– Press Hz/%/ for more than 1 second to enable backlight illumination.

[a]

function.

Button Description

Press momentarily to enable the null math operation. See “Null (Relative)” on page 61 for more information.

– Press Range/Auto momentarily to scroll through the available measurement ranges (except

diode and capacitance measurement).

– Press Range/Auto for more than 1 second to enable automatic range detection (except diode

and capacitance measurement). Press Range/Auto momentarily to disable automatic range detection.

[a] The duty cycle function is only available for U1213A clamp meter.

Getting Started 1

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 29

1 Getting Started

The rotary switch at a glance

Figure 1-6 Clamp meter rotary switch

The rotary switch allows you select desired measurements. To cycle between measurements after rotating to a particular measurement function, press SHIFT.

Measurement function Description

Power off.

[a]

AC, DC

, or AC + DC

AC, DC, or AC + DC

Resistance measurement, audible continuity test, or temperature

[b]

current measurements. By default, measurement is set to AC current.

[b]

voltage measurements. By default, measurement is set to AC voltage.

[a]

measurement. By default, the

measurement is set to resistance measurement.

Diode or capacitance measurement. By default, measurement is set to diode measurement.

[a] The temperature measurement and DC current measurement are only available for U1212A and U1213A clamp meters.

[b] The AC + DC measurement is only available for U1213A clamp meter.

30 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

The terminals at a glance

WARNING

Red input terminals (

V, ,

, )

Black input terminal (

COM)

Ensure that the terminal connections are correct for a particular measurement before making any measurement. To avoid damage to the device, do not exceed the input limit.

Figure 1-7 Clamp meter terminal inputs

Getting Started 1

Tab le 1-4 Terminal connections for different measurement functions

Measurement functions Input terminals Input limit

AC current

DC current

AC voltage

DC voltage

Resistance

Capacitance

Temperature

[a] DC current measurement is only available for U1212A and U1213A clamp meters.

[b] Temperature function is only available for U1212A and U1213A clamp meters.

[a]

Diode

[b]

Clamp jaw

VCOM

COM

1000 A

rms

CAT III 1000 V

CAT IV 600 V

1000 V

short circuit < 0.3 A

rms

for

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 31

1 Getting Started

The clamp jaw at a glance

The clamp jaw is used to perform current measurement without having to make physical contact with or disconnecting the conductor. The clamp jaw can be opened and closed, allowing a maximum opening of 2 inches. Press the handle of the clamp meter to open the clamp jaw. When measuring current, there are 3 jaw markings to observe. Current is measured accurately by placing the conductor in the middle of the 3 jaw markings. See “Performing Current Measurement” on page 36 for more information on performing current measurements.

Figure 1-8 Clamp jaw close and open state

32 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

The rear panel at a glance

Battery cover

Handle

Back panel

Hand guard

Clamp jaw

Jaw markings

Getting Started 1

Figure 1-9 Clamp meter rear panel

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 33

1 Getting Started

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

34 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, and U1213A Clamp Meters

WARNING

User’s and Service Guide

2 Making Measurements

Performing Current Measurement 36 Performing Voltage Measurement 38 Performing Resistance Measurement and Continuity Test 40 Performing Diode Measurement 43 Performing Capacitance Measurement 46 Performing Temperature Measurement 48

This chapter contains many types of measurements that you can make with the U1211A, U1212A, and U1213A Clamp Meters, and how to make the connections for each measurement.

Ensure that the terminal connections are correct for a particular measurement before making any measurement. To avoid damage to the device, do not exceed the input limit.

2 Making Measurements

WARNING

CAUTION

Correct Incorrect

Performing Current Measurement

Ensure the test leads are disconnected from the input terminals when measuring current with the clamp meter.

Ensure that the clamp meter measures only one conductor at a time. Measuring multiple conductors may cause inaccuracy in measurement reading due to vector sum of currents flowing in the conductors.

Steps (see Figure2-1 on page37):

1 Set the rotary switch to ~A.

2 Press Shift once to switch between AC current, DC current (for U1212A and

U1213A only), and AC + DC current (for U1213A only) measurements.

3 Press the handle to open the clamp jaw.

4 Clamp around a conductor and ensure that the conductor fits the markings on

the jaw.

5 Read the display. Press Hz to view the frequency indication on the secondary

display.

36 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Press

Read

Conductor

Making Measurements 2

Figure 2-1 Measuring current

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 37

2 Making Measurements

Performing Voltage Measurement

Steps (Figure2-2 on page39):

1 Set the rotary switch to ~V.

2 Connect the red and black test leads to input terminals V (red) and COM

(black) respectively.

3 Press Shift to switch between AC voltage, DC voltage, and AC + DC voltage

(for U1213A only) measurements.

4 Probe the test points and read the display. Press Hz to view the frequency

indication on the secondary display.

38 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Making Measurements 2

Connect

Press

Probe and read

Figure 2-2 Measuring voltage

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 39

2 Making Measurements

CAUTION

Performing Resistance Measurement and Continuity Test

Disconnect circuit power and discharge all high-voltage capacitors before measuring resistance or conductance, or testing circuit continuity, to avoid damaging the clamp meter or the device under test.

Steps (Figure2-3 on page41):

1 Set the rotary switch to Ω.

2 Connect the red and black test leads to input terminals Ω (red) and COM

(black) respectively.

3 Probe the test points (by shunting the resistor) and read the display.

4 To perform continuity test, press Shift once (see Figure2-4 on page42). The

buzzer will sound when the resistance is below 10.0 Ω.

40 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Making Measurements 2

Probe and read

Connect

Figure 2-3 Measuring resistance

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 41

2 Making Measurements

Probe and read

Connect

Figure 2-4 Continuity test

42 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Performing Diode Measurement

CAUTION

NOTE

Disconnect circuit power and discharge all high-voltage capacitors before testing diodes to avoid damaging the clamp meter.

Steps (see Figure2-5 on page44):

1 Set the rotary switch to . The auto range mode will be disabled (if the auto

range mode was enabled).

2 Connect the red and black test leads to input terminals (red) and COM

(black) respectively.

3 Probe the test points and read the display.

This clamp meter can display diode forward bias of up to approximately 2.1 V. The forward bias of a typical diode is within the range of 0.3 V to 0.8 V.

Making Measurements 2

4 Reverse the probes and measure the voltage across the diode again (see

Figure2-6 on page45). Assess the diode according to the following

guidelines:

– A diode is considered good if the clamp meter displays “OL” in reverse bias

mode.

– A diode is considered shorted if the clamp meter displays approximately 0 V

in both forward and reverse bias modes, and the clamp meter beeps continuously.

– A diode is considered open if the clamp meter displays “OL” in both forward

and reverse bias modes.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 43

2 Making Measurements

Probe and read

Connect

Figure 2-5 Measuring diode (forward bias)

44 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Making Measurements 2

Probe and read

Connect

Figure 2-6 Measuring diode (reverse bias)

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 45

2 Making Measurements

CAUTION

NOTE

Performing Capacitance Measurement

Disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance to avoid damaging the clamp meter or the device under test. To confirm that a capacitor has fully discharged, use the DC voltage function.

The U1211A, U1212A, and U1213A Clamp Meter measures capacitance by charging a capacitor with a known current for a period of time, and then measuring the voltage.

Measuring tips:

– For measuring capacitance greater than 4000 µF, discharge the capacitor

and manually select a suitable measurement range. This will speed up measuring time in order to obtain the correct capacitance value.

– Ensure correct polarity when measuring polarized capacitors.

– For measuring small capacitance values, press with the test leads

open to subtract the residual capacitance of the clamp meter and leads.

Steps (see Figure2-7 on page47):

1 Set the rotary switch to .

2 Press Shift to select capacitance measurement.

3 Connect the red and black test leads to input terminals (red) and COM

(black) respectively.

4 Probe the test points and read the display.

46 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Making Measurements 2

Press

Connect

Probe and read

Figure 2-7 Measuring capacitance

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 47

2 Making Measurements

NOTE

CAUTION

Performing Temperature Measurement

Temperature measurement function is only available for U1212A and U1213A only.

The bead-type thermocouple probe is suitable for measuring temperatures from –20 °C to 204 °C in PTFE-compatible environments. Above this temperature range, the probe may emit toxic gas. Do not immerse this thermocouple probe in any liquid. For best results, use a thermocouple probe designed for specific application — an immersion probe for liquid or gel, and an air probe for air measurement. Observe the following measurement settings:

– Clean the surface to be measured and ensure that the probe is securely

touching the surface. Remember to disable the applied power.

– When measuring above ambient temperatures, move the thermocouple

along the surface until you get the highest temperature reading.

– When measuring below ambient temperatures, move the thermocouple

along the surface until you get the lowest temperature reading.

– Place the clamp meter in the operating environment for at least 1 hour as the

clamp meter is using non-compensation transfer adapter with miniature thermal probe.

Do not bend the thermocouple leads at sharp angles. Repeated bending over a period of time can break the leads.

Steps (see Figure2-8 on page49):

1 Set the rotary switch to Ω.

2 Press Shift twice to select temperature measurement.

3 Connect the thermocouple adapter (with the thermocouple probe connected

to it) into input terminals (red) and COM (black).

4 Touch the measurement surface (device under test) with the thermocouple

probe and read the display.

48 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Making Measurements 2

Press

Connect

Probe and read

Figure 2-8 Measuring temperature

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 49

2 Making Measurements

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

50 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, and U1213A Clamp Meters User’s and Service Guide

3 Functions and Features

Data Hold (Trigger Hold) 52 Refresh Hold 54 Dynamic Recording 56 1 ms Peak Hold 59 Null (Relative) 61

This chapter contains detailed information on functions and features available in the U1211A, U1212A, and U1213A Clamp Meters.

3 Functions and Features

Data Hold (Trigger Hold)

The data hold operation allows you to capture and hold a reading instantaneously through trigger function. You will have to enable the data hold in setup menu before using the data hold operation. See “Setting Data Hold/Refresh Hold mode” on page 70 for more information.

Enabling the data hold function

1 Ensure that the data hold operation is enabled in the setup menu.

2 Press Hold/Max Min to enable the data hold operation.

3 The annunciator display will indicate DH and the data hold function is enabled.

4 Press Hold/Max Min again to trigger.

5 Press Hold/Max Min for more than 1 second to exit the data hold operation.

52 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Press

to trigger

After a stable read ing occurs

Press

to trigger

After a stable read ing occurs

Press

Blinking

Functions and Features 3

Figure 3-1 Data hold operation

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 53

3 Functions and Features

Refresh Hold

The refresh hold operation allows you to capture and hold a reading, within specified variation and threshold values. This is useful in situations when you need to know if the running values of a setup is stable or not.

This is done by comparing the running values to the initial hold value. A preset variation count will determine the range of values that is considered stable in reference to the initial hold value. You can set the variation count through the setup menu. Refer to Chapter4, “Setting Data Hold/Refresh Hold mode,” starting on page 70 on how to set the variation count.

When a stable reading is first detected, the instrument beeps once (if the beeper is enabled), and holds the reading (the initial hold value) on the primary display. The instrument will then compare the running values to the hold value to check if the variation value exceeds the set variation count.

A new reading value will be updated in the primary display when the variation of the measured value exceeds the variation count preset in the setup menu. The instrument beeps once (if the beeper is enabled) when a reading value is updated.

For voltage, current, and capacitance measurements, the reading value will not be updated when the reading falls below the threshold preset in the setup menu.

For continuity and diode tests, the reading value will not be updated when an open state is detected.

Enabling the refresh hold function

1 Ensure that the data hold operation is disabled in the setup menu.

2 Press Hold/Max Min to enable the refresh hold operation. A DH will be shown

on the annunciator display.

3 The clamp meter will be ready to hold new measuring value whenever the

variation of value exceed the setting of variation count. The DH on the annunciator display will blink. The value held earlier will be updated until the measuring value is stable.

4 Press Hold/Max Min for more than 1 second to exit the refresh hold operation.

54 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Functions and Features 3

NOTE

Press

After a stable reading occurs

Variation counts > settings

Press

Blinking

If the reading is unable to reach a stable state (when exceeding the preset variation), the reading value will not be updated.

Figure 3-2 Refresh hold operation

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 55

3 Functions and Features

NOTE

Dynamic Recording

The dynamic recording mode can be used to detect intermittent turn-on or turn-off voltage or current surges, and to verify measurement performance without you being present during the process. While the readings are being recorded, you may perform other tasks.

The average reading is useful for smoothing out unstable inputs, estimating the percentage of time a circuit is operating, and verifying circuit performance.

The dynamic recording mode stores the maximum and minimum values, the average, and the number of readings during a series of measurements. From the annunciator display, you can view the following statistical data for any set of readings: maximum (MAX), average or mean (AVG), and minimum (MIN).

Enabling the dynamic recording mode

1 Press Hold/Max Min for more than 1 second to enable the dynamic recording

mode. The annunciator display will indicate MAX AVG MIN. You are currently in present reading state.

2 Press Hold/Max Min momentarily to cycle through the maximum reading (the

MAX function indicated), minimum reading (the MIN function indicated), or

average reading (the AVG function indicated). Each time a new maximum or minimum value is recorded, the instrument beeps once (if the beeper is enabled).

3 Press Hold/Max Min for more than 1 second again to disable the dynamic

recording mode.

– If an overload is recorded, the average reading recording will stop. The

average reading value indicates “OL” (overload) on the primary display.

– If the dynamic recording mode is enabled with auto range, the value of MAX,

MIN, and AVG for different ranges will be recorded.

– During the dynamic recording mode, the auto power-off feature is

automatically disabled.

56 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Functions and Features 3

The instrument calculates the average of all readings and records the number of readings taken since the dynamic recording mode was enabled.

Accumulated statistics are:

– Max Avg Min: present reading (actual input signal value)

– Max: maximum reading since the dynamic recording mode was enabled

– Min: minimum reading since the dynamic recording mode was enabled

– Avg: true average of all readings since the dynamic recording mode was

enabled

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 57

3 Functions and Features

Press for

> 1 second

Press

Press for

> 1 second

Press for

> 1 second

Press for

> 1 second

Figure 3-3 Dynamic recording mode

58 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

1 ms Peak Hold

Crest factor =

Peak value

True RMS value

NOTE

This function allows the measurement of peak voltage for analysis of components such as power distribution transformers and power factor correction capacitors. The peak voltage obtained can be used to determine the crest factor:

Enabling the 1 ms peak hold function

1 Press Shift/Peak for more than 1 second to toggle 1 ms peak hold mode ON

2 Press Hold/Max Min to switch between maximum and minimum peak

3 Press Shift/Peak for more than 1 second to exit the mode.

4 In the measurement example shown in Figure3-4 on page60, the crest factor

Functions and Features 3

and OFF.

readings. DH MAX indicates maximum peak, while DH MIN indicates minimum peak (DH MIN minimum peak is only available in U1213A).

will be 312.2/220.8 = 1.414.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 59

–If the reading is “OL”, press Range/Auto to change the measurement range

and to restart peak-recording measurement.

– If you need to restart peak recording without changing the range,

press Shift/Peak.

3 Functions and Features

Press for > 1 second

Press

Processing...

Press for > 1 second

Figure 3-4 1 ms peak hold mode operation

60 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Null (Relative)

NOTE

When making null measurements, also called relative, each reading is the difference between a stored (selected or measured) null value and the input signal. One possible application is to increase the accuracy of a 2-wire resistance measurement by nulling the test lead resistance. Nulling the lead is also particularly important prior to making capacitance measurements. The formula used for calculating null measurement is:

Result = Reading — Null value

Enabling the null operation

1 Press to store the displayed reading as the reference value to be

2 Press to view the stored reference value. The symbol on the

3 To exit this mode, press while is blinking on the annunciator

Functions and Features 3

subtracted from subsequent measurements and to set the display to zero. The symbol is indicated on the annunciator display.

annunciator display blinks for 3 seconds before the display turns to zero.

display.

– Null can be set for both auto and manual range settings, but not in the event

of an overload.

– When taking resistance measurement and the meter reads a non-zero value

due to the presence of test leads, use the null function to adjust the d isplay to zero.

– When selecting DC current measurement, the primary display will ind icate a

non-zero DC current value residual magnetism of the jaw and internal sensor effects. Press to zero-adjust the display without clamping any

conductor.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 61

3 Functions and Features

Press

for relative base

Blinking

Press to

exit relative mode

Press to

enable null operation

62 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Figure 3-5 Null (relative) mode operation

Keysight U1211A, U1212A, and U1213A Clamp Meters User’s and Service Guide

4 Changing the Default

Settings

Selecting Setup Menu 64 Default Factory Settings and Available Setting Options 66

This chapter describes the various items and settings in the setup menu. This chapther also describes how to change the default factory settings of the U1211A, U1212A, and U1213A Clamp Meters and other available setting options.

4 Changing the Default Settings

Selecting Setup Menu

To access the setup menu, press and hold Shift/Peak while rotating the rotary switch to ~A (or any other measurement functions on the rotary switch) on the clamp meter.

The setup mode menu allows you to customize a number of non-volatile instrument configurations. Modifying these settings affects the operation of your instrument across several functions. Select the setting you want to edit to do the following:

– Switch between two values, such as on or off.

– Select a value from the list.

– Decrease or increase a value by using the directional keys.

The buttons Hold/Max Min, Shift/Peak, Hz/%/ , , and Range/Auto doubles as save button and directional keypads to toggle the values and to navigate the lists in setup menu.

Tab le 4- 1 Setup mode buttons operation

Setup mode buttons Description

Save settings

Navigation: Left arrow

Toggle: Down arrow

64 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Tab le 4-1 Setup mode buttons operation (continued)

Setup mode buttons Description

Toggle: Up arrow

Navigation: Right arrow

Modifying the settings in setup menu

To change a menu item setting in setup mode, perform the following steps:

1 Press or to navigate the selected menu pages.

2 Press or to toggle the item that needs to be changed. A blinking menu

indicates that changes have been made in the current settings, but not saved.

3 Press Hold/Max Min to save the changes you have made.

4 Press Shift/Peak for more than 1 second to exit the setup mode.

Changing the Default Settings 4

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 65

4 Changing the Default Settings

Default Factory Settings and Available Setting Options

The following table shows the various menu items with their respective default settings and available options.

Tab le 4- 2 Default factory settings and available setting options for each feature

Feature Default factory

setting

0.5 Hz

4800

500

Available setting options

Minimum frequency measurement settings. – Available settings: 0.5 Hz, 1 Hz, 2 Hz, or 5 Hz.

Beep frequency. – Available options: 600 Hz, 1200 Hz, 2400 Hz, 4800 Hz, or OFF.

Refresh hold. – To enable this function, select a value within the range of 100 to 1000. – To disable this function, select OFF. Note: Select OFF to enable data hold (manual trigger)

Automatic power-off. – To enable this function, select a value within the range of 1 minute to

99 minutes.

– To disable this function, select OFF.

Sets the timer to automatically turn off the LCD display backlight. – To enable this function, select a value within the range of 1 minute to

99 minutes.

– To disable this function, select OFF.

Initial current or voltage measurement. – To make AC measurement as the initial measurement, select AC. – To make DC measurement as the initial measurement, select dC. Note: – The default initial measurement of U1211A, U1212A, and U1213A is AC

measurement.

rESt

Default factory settings. Select REST to reset the clamp meter to its default factory settings.

66 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Changing the Default Settings 4

Tab le 4-2 Default factory settings and available setting options for each feature (continued)

Feature Default factory

setting

°C

Available setting options

Filter for DC voltage or DC current measurement. – To enable this function, select ON. – To disable this function, select OFF.

Temperature unit. To set, press Range/Auto for more than 1 second when you are in setup mode.

– Available options:

– °C: Single display, in °C only. – °F: Single display, in °F only. – °C/°F: Dual display, °C in primary display, °F in secondary. – °F/°C: Dual display, °F in primary display, °C in secondary.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 67

4 Changing the Default Settings

Press

Press Press

Press

Initial

Setting minimum frequency measurement

The minimum frequency setup influences the measurement rates for frequency and duty cycle. The typical measurement rate as defined in the general specifications is based on a minimum frequency of 10 Hz.

Figure 4-1 Setting the minimum frequency

68 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Setting beep frequency

Press

The beep frequency can be set to 4800 Hz, 2400 Hz, 1200 Hz, or 600 Hz. OFF means the beep sound is disabled.

Changing the Default Settings 4

Figure 4-2 Setting the beep frequency

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 69

4 Changing the Default Settings

Press Press

Press or to edit the value at a step of 100

Press

Setting Data Hold/Refresh Hold mode

To enable the data hold mode (manual trigger), set this parameter to OFF.

To enable the refresh hold mode (automatic trigger), set the variation count within the range of 100 to 1000 in a step of 100. Once the variation of the measured value exceeds this preset variation count, the refresh hold mode will be ready to trigger and update a new value.

70 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Figure 4-3 Setting the data hold or refresh hold mode

Setting auto power-off mode

Press

Press or to edit the value

Press

Initial

Press or to edit the value

To enable auto power-off mode, set its timer to any value within the range of 1 to 99 minutes.

The instrument will turn off automatically (with auto power-off mode enabled) after the specified amount of time, if none of the following happens within that time:

– Any button is pressed.

– A measurement function is changed.

– Dynamic recording is enabled.

– 1 ms peak hold is enabled.

– Auto power-off mode is disabled in the setup mode.

To reactivate the clamp meter after auto power-off, simply press any button.

To disable auto power-off mode, select OFF. When the auto power-off mode is disabled, in the annunciator display will be turned off. The clamp meter will remain turned on until you manually turn the rotary switch to the OFF position.

Changing the Default Settings 4

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 71

Figure 4-4 Setting the auto power-off duration

4 Changing the Default Settings

Press or to edit the value

Press

Initia

Setting backlight power-on duration

The backlight timer can be set from 1 to 99 seconds. The backlight turns off automatically after the set period.

OFF means the backlight will not turn off automatically.

Figure 4-5 Setting the backlight power-on duration

72 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Setting temperature unit

NOTE

To set the temperature unit, press Range/Auto for more than 1 second when you are in setup mode. Four combinations of displayed unit(s) are available:

– Celcius only: °C single display.

– Celcius/Fahrenheit: °C/°F dual display; °C on primary, and °F on secondary.

– Fahrenheit only: °F single display.

– Fahrenheit/Celcius: °F/°C dual display; °F on primary, and °C on secondary.

Always set the temperature unit display for official requirements and comply with national law and standards.

Changing the Default Settings 4

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 73

4 Changing the Default Settings

Press

for more than 1 second to enable temperature unit menu item

Press

Figure 4-6 Setting the temperature unit

74 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Returning to default factory settings

Press

No other options are available in this menu item. Press Hold/Max Min to reset to default factory settings.

The reset menu item automatically reverts to minimum frequency settings menu item.

Changing the Default Settings 4

Figure 4-7 Reverting to default factory settings

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 75

4 Changing the Default Settings

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

76 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, and U1213A Clamp Meters

CAUTION

User’s and Service Guide

5 Maintenance

General Maintenance 78 Troubleshooting 81 Replacement Parts 82

This chapter will help you troubleshoot malfunctioning U1211A, U1212A, and U1213A Clamp Meters.

Any repair or service which is not covered in this manual should only be performed by qualified personnel.

5 Maintenance

WARNING

NOTE

General Maintenance

Ensure that terminal connections are correct for a particular measurement before making the measurement. To avoid damaging the device, do not exceed the rated input limit.

Dirt or moisture in the terminals can distort readings. Cleaning procedures are as follows:

1 Turn the clamp meter off and remove the test leads.

2 Turn the clamp meter 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.

Prevent rust by wiping metal surfaces with oil from time to time. If rusted, lightly sand the affected area with very fine sandpaper and then oil the metal surfaces.

78 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Battery replacement

WARNING

CAUTION

The battery must be recycled or disposed off properly after depletion.

To avoid instruments being damage from battery leakage:

– Always remove dead batteries immediately.

– Always remove the batteries and store them separately if the clamp

meter is not going to be used for a long period.

The clamp meter is powered by a 9 V alkaline battery. To ensure that the clamp meter performs as specified, it is recommended that you replace the battery as soon as the low battery indicator is displayed in the annunciator display. The procedures for battery replacement are as follows:

1 Set the rotary switch to off.

2 Disconnect test leads from the input terminal.

Maintenance 5

3 Loosen the screw on the battery cover.

4 Lift the battery cover slightly, then pull the battery cover upwards.

5 Replace the specified battery.

6 Reverse the procedures above to close the cover.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 79

5 Maintenance

Loosen screw

Lift battery cover

Pull upwards

Figure 5-1 Replacing the battery in the clamp meter

80 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Troubleshooting

WARNING

To avoid electrical shock, do not perform any servicing unless you are qualified to do so.

If the clamp meter fails to operate, check the battery and test leads. Replace them if necessary. After that, if the instrument still does not function, check to ensure that you have followed the operating procedures given in this instruction manual, before considering servicing the clamp meter.

When servicing the instrument, use only the specified replacement parts.

Table 5-1 will assist you in identifying some basic problems.

Tab le 5-1 Basic troubleshooting procedures

Malfunction roubleshooting procedure

No annunciator display after switching onCheck battery. Replace battery if necessary.

Maintenance 5

No beeper tone Check the setup mode menu to verify whether the beeper function has been set to

off. If so, select the desired driving frequency.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 81

5 Maintenance

NOTE

Replacement Parts

This section contains information for ordering replacement parts for your U1211A, U1212A, and U1213A Clamp Meters. Table 5-2 includes a brief description of each replacement part with its corresponding part number.

You may find the latest U1211A, U1212A, and U1213A Clamp Meters parts list in the Keysight Test and Measurements Parts Catalog (http://www.keysight.com/

find/parts)

To order replacement parts

Not all parts listed are available as field-replaceable parts.

To order replacement parts from Keysight:

1 Contact your nearest Keysight Sales Office or Service Center.

2 Identify the parts by their corresponding Keysight part numbers shown in the

replacement parts list.

3 Provide the instrument model number and serial number.

Tab le 5- 2 Replacement parts list

Part number Description

U1211-46401 Battery cover with IR port (without screw)

5022-6693 Battery cover screw

82 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, and U1213A Clamp Meters User’s and Service Guide

6 Performance Tests and

Calibration

Calibration Overview 84 Recommended Test Equipment 86 Basic Operating Tests 87 Test Considerations 88 Performance Verification Tests 89 Calibration Security 97 Adjustment Considerations 100 Front Panel Calibration 106

This chapter contains the performance test and adjustment procedures. The performance test procedure verifies that the U1211A, U1212A, and U1213A Clamp Meters are operating within its published specifications. The adjustment procedure ensures that the clamp meter remains within the specifications until the next calibration.

6 Performance Tests and Calibration

NOTE

Calibration Overview

This manual contains procedures for verifying the instrument performance, as well as procedures for making adjustments where necessary.

Make sure you have read “Test Considerations” on page 88 before calibrating the instrument.

Closed-case electronic calibration

The U1211A, U1212A, and U1213A clamp meter features closed-case electronic calibration. No internal mechanical adjustments are required. The instrument calculates correction factors based upon the input reference value you set. The new correction factors are stored in the non-volatile memory until the next calibration adjustment is performed. The non-volatile EEPROM calibration memory is retained when the power is off.

Keysight Technologies calibration services

When your instrument is due for calibration, contact your local Keysight Service Center for a low-cost recalibration.

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 1-year calibration interval. Keysight does not recommend extending calibration intervals beyond two years for any application.

84 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Adjustment recommendation

Specifications are only guaranteed within the period stated from the last adjustment. Keysight recommends that re-adjustment should be performed during the calibration process for best performance. This will assure that the U1211A, U1212A, and U1213A clamp meters 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 but this does not guarantee that the instrument will remain within these limits unless the adjustments are performed.

Refer to “Adjustment count” on page 114 and verify that all the adjustments have been performed.

Performance Tests and Calibration 6

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 85

6 Performance Tests and Calibration

Recommended Test Equipment

The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute with another calibration standard of equivalent accuracy.

Tab le 6- 1 Recommended test equipment

Application Recommended equipment

DC voltage Fluke 5520A

DC current Fluke 5520A and Fluke 5500A/COIL

AC voltage Fluke 5520A

AC current Fluke 5520A and Fluke 5500A/COIL

Resistance Fluke 5520A

Capacitance Fluke 5520A

Diode Fluke 5520A

Temperature Fluke 5520A

Short Shorting plug — dual banana plug with copper wire shorting the 2 terminals

86 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Basic Operating Tests

These operating tests are for testing the basic operation of the instrument. Repair is required if the instrument fails any of these basic operating tests.

Testing the display

Press Hold/Max Min while rotating the rotary switch to ~A on the clamp meter to view all segments of the annunciator display. Compare the display with the example in Figure 6-1.

Performance Tests and Calibration 6

Figure 6-1 Full segments of annunciator display

Testing the backlight

Press Hz/%/ for more than 1 second to carry out test on the backlight.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 87

6 Performance Tests and Calibration

Test Considerations

Long test leads can also act as antennas that pick up AC signal noises.

For optimum performance, all procedures should comply with the following recommendations:

– Ensure that the ambient temperature is stable between 18 °C and 28 °C.

Ideally, calibration should be performed at 23 °C ± 2 °C.

– Ensure that the ambient relative humidity is less than 80%.

– Place the clamp meter with the non-compensational transfer adapter with

miniature thermal probe connected to the input terminal in the operating environment for at least 1 hour.

– Allow a 5-minute warm-up period during which a shorting plug is used to

connect 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. Connect the calibrator LO source to

earth at the calibrator, except where otherwise indicated in the procedures. It is important that the LO-to-earth connection be made at only one place in the circuit to avoid ground loops.

Please ensure that the calibration standards and test procedures used do not introduce additional errors. Ideally, the standards used to verify and adjust the instrument should be an order of magnitude more accurate than each instrument range full-scale error specification.

For DC voltage, DC current, and resistance gain verification measurements, you should ensure that the calibrator’s “0” output is correct. You will need to set the offset for each range of the measurement function being verified.

Input connections

For low-thermal offset measurements, test connections to the instrument are best accomplished by shorting the two terminals using dual banana plug with copper wire short. Shielded twisted-pair PTFE interconnect cables of minimum length are recommended between the calibrator and the clamp meter. Cable shields should be grounded to earth. This configuration is recommended for optimal noise and settling time performance during calibration.

88 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Performance Verification Tests

NOTE

Use the following performance verification tests to verify the measurement performance of the U1211A, U1212A, and U1213A clamp meter. These performance verification tests are based on the specifications listed in the instrument data sheet.

These performance verification tests are recommended as acceptance tests when you first receive the instrument. After acceptance, you should repeat the performance verification tests at every calibration interval (to be performed before calibration to identify which measurement functions and ranges require calibration).

If any or all of the parameters fail the performance verification, then adjustment or repair is required.

Carry out the performance verification tests according to Table 6-2 on page90 and “Functional tests (only for U1212A and U1213A)” on page 94. For every listed step:

1 Connect the calibration standard terminals to the input terminals on the clamp

meter.

2 Set up the calibration standard with the signals specified in the “Reference

signals/values” column (one setting at a time, if more than one setting is listed).

3 Turn the rotary switch of the clamp meter to the function being test, and

choose the correct range, as speficied in the table.

4 Check whether the measured reading falls within the specified error limits from

the reference value. If it does, then this particular function and range does not require adjustment (calibration). Otherwise, adjustment is necessary.

Performance Tests and Calibration 6

When performing verification tests on current function, use Fluke 5500A/COIL with Fluke 5520A. Refer to Table 6-1 on page86 for recommended test equipment information.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 89

6 Performance Tests and Calibration

Tab le 6- 2 Performance verification tests

Test function Range Reference signals/

values

5520A output U1211A U1212A U1213A

Temperature

–200 °C to –40 °C –200 °C –

–40 °C to 1372 °C 0 °C –

–40 °C to 1372 °C 1372 °C –

Resistance 400 Ω 400 Ω ±2.3 Ω ±2.3 Ω ±1.5 Ω

4 kΩ 4 kΩ ±0.023 kΩ ±0.023 kΩ ±0.015 kΩ

40 kΩ 40 kΩ – – ±0.15 kΩ

400 kΩ 400 kΩ – – ±1.5 kΩ

4 MΩ 4 MΩ – – ±0.027 MΩ

40 MΩ 40 MΩ – – ±0.85 MΩ

Diode Diode 1.9 V ±0.012 V ±0.012 V ±0.012 V

Capacitance 4 µF 4 µF – – ±0.044 µF

40 µF 40 µF – – ±0.44 µF

Error limits (from nominal 1 year)

± (Probe

accuracy +

5.0 °C)

± (Probe

accuracy +

1.0 °C)

± (Probe

accuracy +

14.7 °C)

± (Probe

accuracy +

5.0 °C)

± (Probe

accuracy +

1.0 °C)

± (Probe

accuracy +

14.7 °C)

400 µF 400 µF ±8.4 µF ±8.4 µF ±8.4 µF

4000 µF 4000 µF ±124 µF ±124 µF ±124 µF

DC voltage 4 V 4 V – – ±0.013 V

40 V 40 V – – ±0.13 V

400 V 400 V ±2.5 V ±2.3 V ±1.3 V

1000 V 1000 V ±8 V ±8 V ±8 V

90 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Tab le 6-2 Performance verification tests (continued)

Performance Tests and Calibration 6

Test function Range Reference signals/

Error limits (from nominal 1 year)

values

5520A output U1211A U1212A U1213A

AC voltage

4 V 4 V, 45 Hz – – ±0.045 V

4 V, 2 kHz – – ±0.085 V

40 V 40 V, 45 Hz – – ±0.45 V

40 V, 2 kHz – – ±0.85 V

400 V 400 V, 45 Hz ±4.5 V ±4.5 V ±4.5 V

400 V, 400 Hz ±4.5 V ±4.5 V –

400 V, 2 kHz – – ±8.5 V

1000 V 1000 V, 45 Hz ±15 V ±15 V ±15 V

1000 V, 400 Hz ±15 V ±15 V –

1000 V, 2 kHz – – ±25 V

Peak voltage (max) 400 V 400 V

, 60 Hz ±8.3 V ±8.3 V ±8.3 V

Frequency 99.99 Hz 10 Hz, 0.6 V – – ±0.05 Hz

9.999 kHz 2 kHz, 20 V ±0.007 kHz ±0.007 kHz –

Duty cycle 0.1% to 99.9% 5 V

at 50%,

––±0.9%

square wave, 2 kHz

AC + DC voltage

[b]

4 V 4 V, 45 Hz – – ±0.069 V

4 V, 2 kHz – – ±0.109 V

40 V 40 V, 45 Hz – – ±0.69 V

40 V, 2 kHz – – ±1.09 V

400 V 400 V, 45 Hz – – ±6.9 V

400 V, 2 kHz – – ±10.9 V

1000 V 1000 V, 45 Hz – – ±24 V

1000 V, 2 kHz – – ±34 V

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 91

6 Performance Tests and Calibration

Table 6-2 Performance verification tests (continued)

Test function Range 5520A output

use with

5500A/COIL

DC current

[a]

40 A 0.8 A 40 A – ±0.75 A ±0.75 A

400 A 8 A 400 A – ±6.3 A ±6.3 A

1000 A 20 A 1000 A – ±25 A ±25 A

AC current

40 A 0.8 A, 45 Hz 40 A, 45 Hz ±0.5 A ±0.9 A ±0.9 A

0.8 A, 100 Hz 40 A, 100 Hz ±0.5 A ±1.3 A ±1.3 A

0.8 A, 400 Hz 40 A, 400 Hz ±0.5 A ±2.7 A ±2.7 A

400 A 8 A, 45 Hz 400 A, 45 Hz ±4.5 A ±8.5 A ±8.5 A

0.4 A, 400 Hz 20 A, 400 Hz ±0.7 A ±1.8 A ±1.8 A

1000 A 14 A, 45 Hz 700 A, 45 Hz ±12 A ±22.5 A ±19 A

2.99999 A, 400 Hz

20 A, 45 Hz 1000 A, 45 Hz – ±30 A ±25 A

AC + DC current

[b]

40 A 0.8 A, 400 Hz 40 A, 400 Hz – – ±3.45 A

400 A 0.4 A, 400 Hz 20 A, 400 Hz – – ±2.5 A

1000 A 1 A, 400 Hz 50 A, 400 Hz – – ±13.25 A

Peak current (max) 400 A 8 A

peak

60 Hz

Reference

values

Error limits (from nominal 1 year)

U1211A U1212A U1213A

150 A, 400 Hz — ±14.75 A ±14.75 A

400 A

peak

±12.3 A ±12.3 A ±12.3 A

60 Hz

[a] The measurement option is only available for U1212A and U1213A.

[b] The measurement option is only available for U1213A.

92 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Performance Tests and Calibration 6

5520A calibrator

50-turn current coil

AC or DC current < 3 A

AC or DC current >= 3 A

Figure 6-2 Current performance verification test setup

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 93

6 Performance Tests and Calibration

NOTE

Functional tests (only for U1212A and U1213A)

DC current offset verification test

1 Place the clamp meter at a stationary position. Keep the clamp jaw closed

without any conductor within the jaw.

2 Turn the rotary switch of the clamp meter to the DC current function.

3 Check whether the measured reading falls within the specified error limits from

the reference value as stated in Table 6-3. Otherwise, repair is recommended. Please contact Keysight Service Center for support.

Ensure that the clamp meter is stationary when conducting the functional tests in order to get accurate readings.

Tab le 6- 3 DC current offset verification test

Test function Range Reference input value

DC current 40 A 0 A ±0.15 A

[a] Null function turned on.

Error limits

[a]

94 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Performance Tests and Calibration 6

Conductor at position 1

Conductor at position 2

AC current balancing verification test

1 Place the clamp meter to a 50-turn current coil as per Figure6-2,“Current

performance verification test setup,” on page93.

2 Move the clamp meter to the conductor at position 1 as shown in the figure

below. Ensure that the conductor position is close to the top of the jaw.

3 Record the current reading at position 1.

4 Slowly move the clamp meter so that the conductor is in position 2 as shown

in the figure below. Ensure that the conductor position is close to the bottom of the jaw.

5 Record the current reading at position 2.

6 Calculate the difference between the readings at position 1 and position 2.

Check whether the difference falls within the specified error limits in Table 6-4. Otherwise, repair is recommended. Please contact Keysight Service Center for support.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 95

6 Performance Tests and Calibration

Tab le 6-4 AC current balancing verification test

Test function Range 5520A output use

with 5500A/COIL

AC current 400 A 6 A, 50 Hz 300 A, 50 Hz ±0.5 A

Reference values Error limits

(Difference between reading at position 1 and position 2)

96 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Calibration Security

NOTE

A calibration security code is in place to prevent accidental or unauthorized adjustments to the instrument. When you first receive your instrument, it is secured. Before you can adjust the instrument, you must “unsecure” it by entering the correct security code (see “Unsecuring the instrument for calibration” on page 97).

The security code is set as 1234 when the instrument is shipped from the factory. The security code is stored in non-volatile memory, which does not change even when the power is off.

You can unsecure the instrument and then change the security code from the front panel or through the remote interface.

The security code may contain up to 4 numeric characters.

See “Resetting the security code to factory default” on page 99 if you forget your security code.

Performance Tests and Calibration 6

Unsecuring the instrument for calibration

Before you can adjust the instrument, you must unsecure it by entering the correct security code. The security code is set to 1234 when the instrument is shipped from the factory. The security code is stored in non-volatile memory, and does not change when the power is turned off.

See Tab le4-1 on page64 for the directional button operations to be used in the subsequent procedures below.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 97

6 Performance Tests and Calibration

NOTE

Unsecuring the instrument

1 Press Range/Auto for more than 1 second while rotating the rotary switch to

~A on the clamp meter to enter the Calibration Security Code entry mode.

2 The annunciator primary display will indicate “5555” and the annunciator

secondary display will indicate “SECU”.

3 Press Range/Auto again to edit and enter security code.

4 Press or (refer to Ta ble4-1 on page64) to step each character in the

code. Press or (refer to Table4-1 on page64) to select each character.

5 Press Hold/Max Min when done. If the correct security code is entered, the

secondary display will indicate “PASS”.

Changing the instrument Calibration Security Code

1 When the meter is in the unsecured mode, press Range/Auto for more than

1 second to enter the Calibration Security Code setting mode.

2 The primary display shows the current security code and the secondary display

shows “CHG”

The factory default calibration security code 1234 will be displayed on the primary display if this is the first time to change the security code.

3 Press or to step each character in the code.

4 Press or to change each character in the code.

5 Press Hold/Max Min to store the new calibration security code. If the new

security code is successfully stored, the secondary display will indicate “PASS”.

98 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Performance Tests and Calibration 6

Resetting the security code to factory default

If you have forgotten the correct security code, you may follow the steps below to change the security code back to the factory default (1234).

1 Record the last 4 digits of the clamp meter serial number.

2 Press Range/Auto for more than 1 second while rotating the rotary switch to

~A on the clamp meter to enter Calibration Security Code entry mode.

3 The annunciator primary display will indicate “5555” and the annunciator

secondary display will indicate “SECU”.

4 Press Range/Auto for more than 1 second to enter the Set Default Security

Code mode.

5 The annunciator secondary display will indicate “SEri” and the annunciator

primary display will indicate “5555”.

6 Press or to step each character in the code. Press or to select

each character.

7 Set the code, similar to the last 4 digits of the instrument serial number

8 Press Hold/Max Min to confirm the entry.

9 If the 4 digits entered are correct, the secondary display will indicate “PASS”.

Now you can use 1234 as the security code. If you want to enter a new security code, see “Changing the instrument Calibration Security Code” on page 98. Ensure you record the new security code.

Keysight U1211A, U1212A, and U1213A User’s and Service Guide 99

6 Performance Tests and Calibration

NOTE

CAUTION

Adjustment Considerations

To adjust the instrument, you will need a test input cable, connectors set, and a shorting plug (see “Input connections” on page 88).

After each adjustment, the secondary display briefly shows “PASS”. If the calibration fails, the clamp meter sounds a beep, and an error number is shown in the secondary display. Calibration error messages are described in “Error

Codes” on page 115. In the event of a calibration failure, correct the problem

and repeat the procedure.

Adjustment for each function should be performed with the following considerations (where applicable):

1 Allow the instrument to warm up and stabilize for 5 minutes before performing

the adjustments.

2 Ensure that during the adjustment, the low-battery indicator does not appear.

Replace the battery as soon as possible to avoid false reading.

3 Consider thermal effects as you connect test leads to the calibrator and this

instrument. It is recommended that you wait for 1 minute after connecting the test leads before you begin the calibration.

4 During ambient temperature adjustment, ensure that the instrument has been

turned on for at least 1 hour with the K-type thermocouple connected between the instrument and the calibration source.

Never turn off the instrument during calibration. This may delete the calibration memory for the present function.

100 Keysight U1211A, U1212A, and U1213A User’s and Service Guide

Keysight U1211A, U1212A, U1213A User's And Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Keysight U1211A, U1212A, and U1213A Clamp Meters

User’s and Service Guide

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Measurement Category

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Regulatory Markings

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Product category

Sales and Technical Support

Table of Contents

List of Figures

List of Tables

1 Getting Started

Introduction

Features

Initial Inspection

Standard purchase items

Product at a Glance

The front panel at a glance

The annunciator display at a glance

The buttons at a glance

The rotary switch at a glance

The terminals at a glance

The clamp jaw at a glance

The rear panel at a glance

2 Making Measurements

Performing Current Measurement

Performing Voltage Measurement

Performing Resistance Measurement and Continuity Test

Performing Diode Measurement

Performing Capacitance Measurement

Performing Temperature Measurement

3 Functions and Features

Data Hold (Trigger Hold)

Enabling the data hold function

Refresh Hold

Enabling the refresh hold function

Dynamic Recording

Enabling the dynamic recording mode

1 ms Peak Hold

Enabling the 1 ms peak hold function

Null (Relative)

Enabling the null operation

Selecting Setup Menu

Default Factory Settings and Available Setting Options

Setting minimum frequency measurement

Setting beep frequency

Setting Data Hold/Refresh Hold mode

Setting auto power-off mode

Setting backlight power-on duration

Setting temperature unit

Returning to default factory settings

5 Maintenance

General Maintenance

Battery replacement

Troubleshooting

Replacement Parts

To order replacement parts

Calibration Overview

Closed-case electronic calibration

Keysight Technologies calibration services

Calibration Interval

Adjustment recommendation

Recommended Test Equipment

Basic Operating Tests

Testing the display

Testing the backlight

Test Considerations

Input connections

Performance Verification Tests

Functional tests (only for U1212A and U1213A)

Calibration Security

Unsecuring the instrument for calibration

Adjustment Considerations