Keysight U1241AN User's And Service Manual

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Keysight U1241AN Handheld Digital Multimeter
User’s and Service Guide
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Notices
CAUTION
WARNING
Copyright Notice
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
U1241-90038
Edition
Edition 9, July 30, 2016
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.
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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.
Direct current (DC) Off (supply)
Alternating current (AC) On (supply)
Both direct and alternating current Caution, risk of electric shock
Three-phase alternating current
Earth (ground) terminal Caution, hot surface
Protective conductor terminal Out position of a bi-stable push control
Caution, risk of danger (refer to this manual for specific Warning or Caution information)
Frame or chassis terminal In position of a bi-stable push control
Equipotentiality
Equipment protected throughout by double insulation or reinforced insulation
CAT III
1000 V
CAT IV
600 V
Category III 1000 V overvoltage protection
Category IV 600 V overvoltage protection
Keysight U1241AN User’s and Service Guide 3
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General Safety Information

WARNING
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 warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
– Do not exceed any of the measurement limits defined in the specifications
to avoid instrument damage and the risk of electric shock.
– Observe all markings on the instrument before connecting any wiring to
the instrument.
– When working above 60 VDC, 30 VAC RMS, or 42.4 Vpeak, exercise
caution – such range poses a shock hazard.
– Do not measure more than the rated voltage (as marked on the
multimeter) between terminals, or between terminal and earth ground.
– Double-check the multimeter operation by measuring a known voltage.
– For current measurement, power off circuit power before connecting the
multimeter to the circuit. Always place the multimeter in series with the circuit.
– 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 multimeter before you open the battery cover.
– Do not use the multimeter with the battery cover or part of the cover
removed or loose.
– Replace the battery as soon as the low battery indicator flashes on
screen. This is to avoid false readings, which may lead to possible electric shock or personal injury.
– 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 multimeter if it is damaged.
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WARNING
– Inspect the test probes for damaged insulation or exposed metal, and
CAUTION
check for continuity. Do not use the test probe if it is damaged.
– To avoid arc explosion, make sure that the probe tip and probe tip
accessories are rated for the measurement environment. CAT II and CAT III accessories must not be used in a CAT IV environment.
– Do not use repaired fuses or short-circuited fuse-holders. For continued
protection against fire, replace the line fuses only with fuses of the same voltage and current rating and recommended type.
– Do not service or perform adjustments alone. Under certain 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.
Do not substitute parts or modify equipment to avoid the danger of
introducing additional hazards. Return the product to Keysight Sales 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 Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained.
Keysight U1241AN User’s and Service Guide 5
– Power 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.
– Ensure proper insertion of battery in the multimeter, and follow the
correct polarity.
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Measurement Category

The U1241AN 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 U1241AN User’s and Service Guide
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Environmental Conditions

CAUTION
This instrument is designed for indoor use and in an area with low condensation with use of standard or compatible test probes. The table below shows the general environment requirements for this instrument.
Environmental condition Requirement
Operating environment Full accuracy at –10 °C to 55 °C
Operating relative humidity
Storage environment –40 °C to 70 °C
Altitude
Pollution degree Pollution Degree 2
Full accuracy up to 80% RH for temperature up to 30 °C, decreasing linearly to 50% RH at 55 °C
Up to 2000 meters per IEC 61010-1
nd
Edition CAT III, 1000 V/IEC 61010-1 2
2 Edition CAT IV, 600 V
nd
– The Keysight U1241AN complies with the following safety and EMC
requirements:
– IEC 61010-1:2001 / EN61010-1:2001
– USA: ANSI/UL61010-1:2004
– Canada: CAN/CSA C22.2 No. 61010-1-04
– IEC 61326-1:2005/EN 61326-1:2006
– Canada: ICES-001:2004
– Australia/New Zealand: AS/NZS CISPR11:2004
– Compliance with IEC 61000-4-3 Radiated Immunity, Criteria A, may
require appropriate positioning of instrument test leads.
Keysight U1241AN User’s and Service Guide 7
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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.
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.
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.
The CSA mark is a registered trademark of the Canadian Standards Association.
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.
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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 or 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 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/handhelddmm
(product-specific information and support, software and documentation updates)
www.keysight.com/find/assist
(worldwide contact information for repair and service)
Keysight U1241AN User’s and Service Guide 9
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In This Guide…

1 Getting Started
This chapter introduces the key features and steps to get started with the U1241AN handheld digital multimeter. This chapter also guides you through the basics of the front panel operations.
2 Features and Functions
This chapter contains detailed information on how to configure connections to perform measurements using the U1241AN handheld digital multimeter.
3 Default Settings Configurations
This chapter describes on how to change and configure the default settings of the U1241AN handheld digital multimeter including data logging and other features.
4 Service and Maintenance
This chapter provides you with warranty services, maintenance procedures, and troubleshooting hints to solve general problems that you may encounter with the instrument. Repair or service which are not covered in this manual should only be performed by qualified service personnel. Please return to Keysight for product exchange if the product fails within the warranty period.
5 Performance Tests and Calibration
This chapter contains procedures of performance verification tests and calibration adjustments. The performance tests is to ensure the multimeter is operating within its published specifications.
6 Specifications and Characteristics
For the characteristics and specifications of the U1241AN Handheld Digital Multimeter, refer to the datasheet at http://literature.cdn.keysight.com/litweb/ pdf/5989-7040EN.pdf.
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Table of Contents

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
In This Guide… . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1 Getting Started
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Checking the Shipping Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
The Front Panel at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Adjusting Tilt Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
The Annunciator at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Analog Bar Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
The Keypad and Rotary Switch at a Glance . . . . . . . . . . . . . . . . . . . . . .25
The Input Terminal at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
2 Features and Functions
Measuring Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Measuring Current (> 440 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Measuring Current (< 440 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Measuring % Scale of 4 – 20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Measuring Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Measuring Resistance and Testing Continuity . . . . . . . . . . . . . . . . . . . .32
Testing Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
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Measuring Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Measuring Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
MINMAX Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Data Hold (Trigger Hold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Refresh Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Null (Relative) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Manual Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Interval Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Reviewing Logged Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Removing Logged Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Checking Battery Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Alerts and Warning During Measurement . . . . . . . . . . . . . . . . . . . . . . . 43
Overload Alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Input-A Warning Alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Input-mA Warning Alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3 Default Settings Configurations
Setting Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4Service and Maintenance
General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Returning Instrument for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5 Performance Tests and Calibration
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Closed-case Electronic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Adjustment is Recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
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Basic Operating Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Backlight test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Testing the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Input-A Terminal Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Input-mA Terminal Alert Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Calibration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Unsecuring the Multimeter for Calibration . . . . . . . . . . . . . . . . . . . .68
Using the Front Panel for Adjustments . . . . . . . . . . . . . . . . . . . . . . .70
Adjustment Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Valid Adjustment Input Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Calibration Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Exiting Adjustment Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Calibration Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Calibration Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
6 Specifications and Characteristics
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List of Figures

Figure 1-1 U1241AN front panel . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 1-2 Tilt stand positions . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 1-3 U1241AN annunciator display . . . . . . . . . . . . . . . . . . .23
Figure 1-4 U1241AN keypad and rotary switch . . . . . . . . . . . . . .25
Figure 1-5 U1241AN input terminals . . . . . . . . . . . . . . . . . . . . . . .26
Figure 2-1 Manual logging display . . . . . . . . . . . . . . . . . . . . . . . .40
Figure 2-2 Interval logging display . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 2-3 Battery capacity display . . . . . . . . . . . . . . . . . . . . . . . .42
Figure 4-1 Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Figure 4-2 Fuse 1 replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Figure 4-3 Fuse 2 replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Figure 5-1 Annunciator display . . . . . . . . . . . . . . . . . . . . . . . . . . .60
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List of Tables

Table 1-1 List of standard items . . . . . . . . . . . . . . . . . . . . . . . . . .21
Table 1-2 General display annunciators . . . . . . . . . . . . . . . . . . .23
Table 1-3 Bar graph counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Table 1-4 Keypad descriptions and functions . . . . . . . . . . . . . . .25
Table 1-5 Features accessible through the front panel keypad .26 Table 1-6 Terminal connections for different measuring functions .
27
Table 2-1 Functions available for data logging . . . . . . . . . . . . . .39
Table 3-1 Available setting options in Setup mode . . . . . . . . . . .47
Table 4-1 Basic troubleshooting hints . . . . . . . . . . . . . . . . . . . . .54
Table 4-2 List of replacement part number . . . . . . . . . . . . . . . . .54
Table 5-1 Recommended test equipment . . . . . . . . . . . . . . . . . .59
Table 5-2 Verification tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Table 5-3 Valid adjustment input values . . . . . . . . . . . . . . . . . . .72
Table 5-4 Calibration adjustments . . . . . . . . . . . . . . . . . . . . . . . .75
Table 5-5 Calibration error codes . . . . . . . . . . . . . . . . . . . . . . . . .80
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide

1 Getting Started

Introduction 20 Checking the Shipping Contents 21 The Front Panel at a Glance 22 Adjusting Tilt Stand 22 The Annunciator at a Glance 23 The Keypad and Rotary Switch at a Glance 25 The Input Terminal at a Glance 26
This chapter introduces the key features and steps to get started with the U1241AN handheld digital multimeter. This chapter also guides you through the basics of the front panel operations.
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1 Getting Started

Introduction

The U1241AN handheld digital multimeter key features are:
– DC and AC voltage measurements
– DC and AC current measurements
– True RMS measurement for both AC voltage and current
– Ambient temperature readout at secondary display with each measurement
– Resistance measurement up to 100 MΩ
– Diode and audible continuity tests
– Capacitance measurement up to 10 mF
– The percentage scale readout for 4–20 mA or 0–20 mA measurement
– Temperature test with selectable 0
– K-type temperature measurement
– MINMAX recording for minimum, maximum, and average readings
– Data Hold with manual or auto trigger modes
– Null/Relative function
readout
°C compensation (without ambient
temperature compensation)
– Auto or manual data logging memories
– Battery capacity indicator
– Adjustable brightness level of blue LED backlight display
– Closed case calibration
– 10,000 count precision true RMS digital multimeter, designed to meet EN/IEC
61010-1:2001 Category III 1000 V/Category IV 600 V Overvoltage Protection, Pollution Degree 2 standards
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Checking the Shipping Contents

Verify that you have received the following items with your unit. If anything is missing or damaged, please contact the nearest Keysight Sales Office.
Tab le 1-1 List of standard items
Type Items
U1241AN handheld digital multimeter
Four 1.5 V AAA alkaline batteries
Standard
Test leads
Product Reference CD-ROM
Certificate of Calibration
Getting Started 1
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1 Getting Started
Display
Keypad
Rotary switch
Input terminal
Pull the tilt stand outwards to its maximum reach (approximately 60°)
Bend the tip of the stand
Tilt stand at 60° Tilt stand at 30°

The Front Panel at a Glance

Figure 1-1 U1241AN front panel

Adjusting Tilt Stand

Figure 1-2 Tilt stand positions
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The Annunciator at a Glance

To view the full display, press and hold while turning the rotary switch from OFF to any non-OFF position. Press any key to resume normal functionality mode.
Figure 1-3 U1241AN annunciator display
Getting Started 1
Tab le 1-2 General display annunciators
Annunciator Description Annunciator Description
21-segment analog bar graph display Data logging mode
Capacitor discharge indicator Data logging view mode
Cold junction of ambient temperature disabled
Audible continuity for resistance and diode function
Primary display Null math function
AC or DC measurement mode
Auto range Primary measurement units
Diode/test mode Measurement range
Auto or manual for data logging mode and data logging viewing mode
Secondary display (ambient temperature display)
Thermocouple type for temperature measurement
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1 Getting Started
Tab le 1-2 General display annunciators (continued)
Annunciator Description Annunciator Description
T1 temperature measurement Low battery indicator
Data hold Auto power off indicator
MINMAX record ing mode

Analog Bar Graph

When frequency is indicated on the primary display during voltage or current measurement, the bar graph represents the voltage or current value. When 4–20 mA% scale or 0–20 mA% scale is indicated on the primary display, the bar graph represents the current value. Each segment represents 500 or 50 counts depending on the range indicated on the peak bar graph.
Tab le 1-3 Bar graph counts
Range Counts/Segment Function
50 Diode
500 V, A, Ω, diode
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The Keypad and Rotary Switch at a Glance

Figure 1-4 U1241AN keypad and rotary switch
Tab le 1-4 Keypad descriptions and functions
Getting Started 1
Function First level function Range Second level function(s)
(press )
OFF Power off the multimeter
DCV measurement 0.1 mV to 1000 V ACV measurement 50.0 mV to 1000 V
Diode test
Resistance measurement 0.01 Ω to 100 MΩ Audible continuity measurement
Capacitance measurement 0.1 nF to 10 mF
DCµA measurement 0.1 μA to 10000 μA ACµA measurement 50.0 μA to 10000 μA
DCmA measurement 0.01 mA to 440 mA
DCA measurement 0.001 A to 10 A ACA measurement 0.500 A to 10.000 A
DCmV measurement 0.1 mV to 100 mV
Switch counter measurement
ACmA measurement 5.00 mA to 440.0 mA
mA% scale
T1 temperature ACmV measurement
Range
–40 °C to 1000 °C
0.1 mV to 1000 V
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1 Getting Started
WARNING
Tab le 1-5 Features accessible through the front panel keypad
Actions Steps
Turns ON backlight
Checks battery capacity
Freezes the measured value
Starts MAX/MIN/AVG recording
Offsets the measured value
Changes the measuring range
Turns on autoranging
Changes and selects functions
Views logging data
Measures frequency for AC signal
Starts manual data logging
Press
Press and hold for > 1 second
Press
Press and hold for > 1 second
Press
Press
Press and hold for > 1 second
Press
Press and hold for > 1 second
Press
Press and hold for > 1 second

The Input Terminal at a Glance

To avoid damaging this device, do not exceed the rated input limit.
Figure 1-5 U1241AN input terminals
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Getting Started 1
WARNING
Tab le 1-6 Terminal connections for different measuring functions
Measurement Functions Input terminal Overload Protection
Voltage
Diode
COM
Capacitance
AC/DC μA
μA mA COM 440 mA, 30 kA/fast-acting fuse
AC/DC mA
AC/DC A A COM 11A, 30 kA/fast-acting fuse
Temperature +T1 –T1 1000 Vrms < 0.3A short circuit current
1000 Vrms
1000 Vrms for short circuit current <0.3 AResistance (Ω)
To avoid damaging the device, do not exceed the rated input limit.
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1 Getting Started
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide

2 Features and Functions

Measuring Voltage 30 Measuring Current (> 440 mA) 30 Measuring Current (< 440 mA) 31 Measuring % Scale of 4 – 20 mA 31 Measuring Frequency 32 Measuring Resistance and Testing Continuity 32 Testing Diodes 33 Measuring Capacitance 34 Measuring Temperature 35 MINMAX Recording 36 Data Hold (Trigger Hold) 37 Refresh Hold 37 Null (Relative) 38 Data Logging 39 Checking Battery Capacity 42 Alerts and Warning During Measurement 43
This chapter contains detailed information on how to configure connections to perform measurements using the U1241AN handheld digital multimeter.
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2 Features and Functions
WARNING
Press to select AC vol tage
measurement mode.
Press to select AC current
measurement mode.

Measuring Voltage

Ensure that terminal connections are correct for that particular measurement before performing any measurement. To avoid damaging the device, do not exceed the rated input limit.
Measuring DC voltage Measuring AC voltage

Measuring Current (> 440 mA)

Measuring DC current Measuring AC current
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Measuring Current (< 440 mA)

NOTE
Press to select AC current
measurement mode.
If the measured value is lower than 440 mA, use the mA or μA current measurement mode.
Features and Functions 2

Measuring % Scale of 4 – 20 mA

The percentage scale of 0–20 mA or 4–20 mA is selectable in setup mode.
Press
at position
Keysight U1241AN User’s and Service Guide 31
The percentage scale is indicated on the primary display and the bar graph indicates the current value. The 25% scale readout represents DC 5 mA at 0–20 mA and DC 8 mA at 4–20mA.
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2 Features and Functions
CAUTION

Measuring Frequency

Press
The frequency measurement is applicable for AC voltage measurement.
The bar graph is used to indicate the value of the AC voltage.
at position
Alternatively, press to display the value of the AC voltage. The multimeter will return to the frequency measurement display automatically after three seconds.

Measuring Resistance and Testing Continuity

Disconnect circuit power and discharge all high-voltage capacitors before measuring resistance to prevent possible damage to the multimeter or the device under test.
Measurement range Beeper sound threshold
Press at position to enable the
continuity test functions
100.00 Ω < 1 Ω
1000.0 Ω < 10 Ω
10.000 kΩ < 100 Ω
100.00 kΩ < 1 kΩ
1.0000 MΩ < 10 kΩ
10.000 MΩ < 100 kΩ
100.00 MΩ < 1 MΩ
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NOTE
Press button to select measurement range from 1 kΩ to 100 MΩ.
CAUTION
Reverse bias Forward bias
NOTE

Testing Diodes

Disconnect any circuit power and discharge all high-voltage capacitors before testing diodes to prevent possible damage to the multimeter.
Features and Functions 2
The multimeter can display forward bias diode of up to approximately 1.1 V. Typical forward bias diode ranges between 0.3 to 0.8 V with audible beeper sound.
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2 Features and Functions
CAUTION

Measuring Capacitance

Disconnect any circuit power and discharge all high-voltage capacitors before measuring capacitance to prevent possible damage to the multimeter or the device under test. To confirm that the capacitors have been discharged, use the DC voltage measurement function.
Measuring tips:
– For measuring capacitances
greater than 10,000 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 the polarity is correct
when measuring polarized capacitors.
–For measuring small
capacitances, press with the test leads open to subtract the residual capacitance of the multimeter and leads.
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Measuring Temperature

CAUTION
– Do not bend the thermocouple leads at sharp angles. Repeated bending
over a period of time can break the leads.
– Do not contact the temperature sensor to any surface that has an energized
voltage or current source, such sources will pose a shock hazard.
Press at
function
Features and Functions 2
Measuring tips:
– Clean the measurement
surface and remember to disable the applied power.
– When measuring
temperature, move the thermocouple along the surface until you get the highest/lowest temperature reading.
– For quick measurement, use
the 0 °C compensation to see the temperature variation of the thermocouple sensor. The 0 °C compensation assists you in measuring relative temperature.
If you are working in a varied environment, where ambient temperature is not constant, do the following:
1 Press for more than one second to enable 0 °C compensation. This
function allows a quick measurement of the relative temperature.
2 Avoid contact between the thermocouple probe and the measurement surface.
3 After a constant reading is obtained, press to set the reading as the
relative reference temperature.
4 Touch the measurement surface with the thermocouple probe.
5 Read the display for the relative temperature.
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2 Features and Functions
NOTE

MINMAX Recording

1 Press for more than one second to enter MINMAX recording mode. The
multimeter is now in continuous mode or non-data hold (non-trigger) mode.
2 The beeper sounds when a new maximum or minimum value is recorded.
3 Press to scroll through maximum, minimum, or average present readings.
The MAX, MIN, AVG, or MAXMINAVG annunciator lights up correspondingly to the displayed readings.
4 Press for more than one second to exit MINMAX Recording mode.
– The average value is the true average of all measured values taken in the
MINMAX recording mode.
– If an overload is recorded, the averaging function will stop and OL will be
displayed.
– The auto power off feature ( ) is disabled in MINMAX recording mode.
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Data Hold (Trigger Hold)

NOTE
The data hold function allows you to freeze the displayed digital value.
1 Press to freeze the displayed value and to enter manual trigger mode.
Notice that the annunciator is displayed.
2 Press to trigger the freeze of the next value being measured. The
annunciator will flash before the new value is updated onto the display.
3 Press for more than one second to exit this mode.

Refresh Hold

You are required to activate the Refresh Hold in the setup mode.
1 Press to enter Refresh Hold mode. The present value will be held, and
the annunciator is displayed.
Features and Functions 2
2 The multimeter is ready to hold new measuring value once the variation of
measuring value exceeds the setting of variation count, and the annunciator is flashed.
3 The hold value will be updated until the measuring value is stable. The
annunciator will then stop flashing and an audible tone will sound to remind you.
4 Press again to disable this function.
– For voltage, current, and capacitance measurements, the holding value will
not be updated if the reading is below 50 counts.
– For resistance and diode measurements, the holding value will not be
updated if the reading is in “OL” (open state).
– The holding value may not be updated if the reading does not reach stable
state for all measurements.
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2 Features and Functions
NOTE

Null (Relative)

The Null function subtracts a stored value from the present measurement and displays the difference between the two values.
1 Press to store the displayed reading as the reference value to be
subtracted from subsequent measurements and to set the display to zero. The
NULL annunciator is displayed.
2 Press to view the stored reference value. The NULL annunciator will
flash for three seconds before the display returns to zero. To exit this mode, press while NULL is flashing on the display.
– In resistance measurement, the multimeter reads a non-zero value due to the
presence of test leads resistance. Use the Null function to zero-adjust the effect of test lead resistance.
– In DC voltage measurement, the thermal effect will influence the accuracy.
Short the test leads and press once the displayed value is stable in order to zero out the offset.
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Features and Functions 2

Data Logging

The data logging function stores the data in non-volatile memory. Thereby, the data remains saved when the multimeter is turned off. Data logging records only the value on primary display. Two options of data logging are offered — Hand (manual) logging and Interval (automatic) logging functions.
Tab le 2-1 Functions available for data logging
Function Mode Range
Voltage DC, AC 1000 mV to 1000 V
Current DC, AC, % of mA 1000 μA to 10 A
Hz AC Auto
Ω Continuity 1000 Ω to 100 MΩ
Diode
1.1 V
Capacitance
Temperature T1
Relative
Recording mode MAX, MIN, AVG, MAXMINAVG
Hold

Manual Logging

To enable the Hand (manual) logging function, select the Hand logging mode in Setup mode.
1 Press (Log) for more than one second to store the present value and
function on the primary display to memory.
2 Press (Log) again for the next value that you want to save into memory,
see Figure 2-1.
1000 nF to 10 mF
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2 Features and Functions
NOTE
NOTE
3 Press (Log) for more than one second to exit this mode.
Figure 2-1 Manual logging display
The maximum data that can be stored is 100 entries. When the 100 entries are filled, the FUL annunciator is indicated on the secondary display.

Interval Logging

To enable the Interval (automatic) logging function, select the Interval logging by defining the interval setting in Setup mode.
1 Press (Log) for more than one second to store the present value and
function on the primary display to memory.
2 The reading automatically logs into the memory in every interval as preset in
Setup mode, see Figure 2-2.
3 Press (Log) for more than one second to exit this mode.
When interval (automatic) logging is enabled, all keypad operation is disabled, except for the LOG function.
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Figure 2-2 Interval logging display
NOTE
The maximum data that can be stored is 200 entries. When the 200 entries are filled, the FUL annunciator is indicated on the secondary display.

Reviewing Logged Data

1 Press (View) for more than one second to enter the Log View mode. The
last recorded entry and last logging index are displayed on the secondary display.
Features and Functions 2
2 Press to scroll through the logged data. Press to select the first
record or press to select the last record for quick navigation.
3 Press to switch between hand (manual) and interval (automatic) logging
review mode.
4 Press (View) for more than one second to exit the Log View mode.

Removing Logged Data

Press (Log) for more than one second at the respective Log Review mode (hand or interval) to clear all logged data in the memory.
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2 Features and Functions

Checking Battery Capacity

The battery sign will flash when the battery voltage drops below 4.4 V. Once the low battery sign is displayed, it is highly recommended to replace the batteries immediately. See Chapter 4, “Battery Replacement” on page 50.
To check the battery capacity, see the following steps:
1 Press (BAT) for more than one second to view the battery capacity. The
multimeter will resume back to normal function automatically after three seconds.
2 The primary display illustrates the flashing bAt annunciator and the bar graph
indicates the battery capacity in proportional percentage from 4.2 V (0%) to
6.0 V (100%).
Figure 2-3 Battery capacity display
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Alerts and Warning During Measurement

WARNING

Overload Alert

For your safety, please be aware of the overload alert. When you are alerted, immediately remove the test leads from the measuring source.
The multimeter provides an overload alert for voltage measurement in both auto and manual range modes. The multimeter beeps periodically once the measuring voltage exceeds 1100.0 V.

Input-A Warning Alert

The multimeter sounds an alerting beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the corresponding A location. The display indicates a flashing AErr annunciator until the test lead is removed from the A input terminal.
Features and Functions 2

Input-mA Warning Alert

The multimeter sounds an alerting beep when the μA/mA input terminal detects a voltage level of more than 1.6 V. The display indicates a flashing CErr annunciator until the test lead is removed from the μA/mA input terminal.
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide
3 Default Settings
Configurations
Setting Configurations 46
This chapter describes on how to change and configure the default settings of the U1241AN handheld digital multimeter including data logging and other features.
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3 Default Settings Configurations
NOTE

Setting Configurations

1 Turn the multimeter OFF.
2 From the OFF position, press and hold (Setup) while turning the rotary
switch to any non-OFF position.
You will hear a beep when the multimeter is successfully in Setup mode. You may then release the button.
To change a menu item setting in Setup mode, perform the following steps:
1 Press or to scroll through menu items.
2 Press or to scroll through available settings. See Table 3-1 on page 47
for the details of each available option.
3 Press (Save) to save the changes. These parameters remain in the
non-volatile memory.
4 Press and hold (Setup) for more than one second to exit Setup mode.
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Tab le 3-1 Available setting options in Setup mode
n
Default Settings Configurations 3
Menu item Available setting options
Setup Description Selection Description
OFF Enables Data Hold (manual trigger)
rHd Trigger hold
SCA Percentage scale
FrE
Minimum frequency
can be measured
100–1000
0–20 mA,
4–20 mA
0.5 Hz, 1 Hz, 2 Hz, 5 Hz
Sets variation count that determines Refresh Hold
(auto trigger)
Sets percentage scale readout for 0mA to 20 mA or
4 mA to 20 mA
Sets the minimum frequency that can be measured
in AC measurement mode
2400 Hz,
bEP
Frequency of beep
sound
1200 Hz,
600 Hz,
300 Hz
Sets frequency of beep sound of the multimeter
OFF Disables beep sound of multimeter
tYPE Sets thermocouple type to K-type
tP
Thermocouple
tYPE
[a]
Sets thermocouple type to J-type
tYPE mV Sets 100 mV measurement for T1 input
Hand Enables manual data logging
Log Data logging
1–9999 s
Sets interval for automatic data logging from 1 to
9999 seconds. Press to toggle through the
digit to be adjusted.
APF
Auto power off
[a]
1–99 m Sets timer in minutes for auto power off
OFF Disables auto power off
Default factory
setting
500
4–20 mA
0.5 Hz
2400 Hz
tYPE K
Hand
15 m
Lit Backlight timer
1–99 s
Sets timer in seconds for auto turn-off for backlight
display
15
OFF Disables auto turn-off for backlight display
dAC
Default AC or DC for
voltage and current
measurements
dC, AC
Defines the preferred setup of AC or DC for voltage
and current measurement once multimeter is
turned on.
dC
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3 Default Settings Configurations
n
n
Tab le 3-1 Available setting options in Setup mode (continued)
Menu item Available setting options
Setup Description Selection Description
Resets the multimeter to the factory settings by
rSt Reset dFAU
pressing and holding for more than
1 second. A beep sound indicates the reset is
being done.
Sets temperature measurement to °C, pressing
d-CF
to change measurement unit to °F
d-F Sets temperature measurement to °F
tP
Temperature
[b]
Sets temperature measurement to °F, pressing
d-FC
to change measurement unit to °C
d-C Sets temperature measurement to °C
[a] To activate the multimeter after it has auto power off, press any button to resume back to respective functional mode.
[b] To view Temperature (tP) menu, press
for more than one second.
Default factory
setting
dFAU
d-CF
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide

4 Service and Maintenance

General Maintenance 50 Battery Replacement 50 Fuse Replacement 52 Troubleshooting 54 Returning Instrument for Service 55
This chapter provides you with warranty services, maintenance procedures, and troubleshooting hints to solve general problems that you may encounter with the instrument. Repair or service which are not covered in this manual should only be performed by qualified service personnel. Please return to Keysight for product exchange if the product fails within the warranty period.
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4 Service and Maintenance
WARNING
WARNING

General Maintenance

To avoid electrical shock or damage to the multimeter, ensure that no water stays inside the casing.
Dirt or moisture in the terminals can distort readings. Cleaning steps are as follows:
1 Turn the multimeter off and remove the test leads.
2 Turn the multimeter over and shake out any dirt that may have accumulated in
the terminals.
3 Wipe the case with a damp cloth and mild detergent — do not use abrasives or
solvents. Wipe the contacts in each terminal with a clean swab dipped in alcohol.

Battery Replacement

Do not discharge the battery by shorting the battery or reverse the battery polarity in any subjects.
The multimeter is powered by 6.0 V (1.5 V x 4 batteries), and uses only the specified battery type. To ensure the specification specified, it is suggested to replace the battery immediately when the low battery sign is displayed and flashing. See the following procedures for battery replacement:
1 At the rear panel, turn the tilt stand to up side.
2 Unscrew the battery cover, notice the screw may not remove as loosed.
3 Lift and remove the battery cover to the direction of screw.
4 Replace the specified batteries and ensure the correct polarity of batteries.
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Service and Maintenance 4
Battery cover screw
5 Reverse the procedures of opening the cover to close the battery cover.
Battery Types ANSI/NEDA IEC
Alkaline 24A LR03
Zinc Chloride 24D R03
Figure 4-1 Battery replacement
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4 Service and Maintenance
NOTE
Fuse 1 (440 mA/1000 V)

Fuse Replacement

You are recommended to use clean/dry gloves when performing fuse replacement. Do not touch any components except the fuse and plastic parts. No recalibration is required after replacing the fuse.
1 Turn the multimeter off and disconnect the test leads from external
equipment.
2 Loosen the four screws at the rear panel, lift and remove the cover.
3 Gently remove the defective Fuse 1 by prying one end of the fuse and removing
it out of the fuse bracket, see Figure 4-2 on page 52.
4 Replace a new fuse of the same size and rating into the center of the fuse
holder.
Figure 4-2 Fuse 1 replacement
5 If you want to replace a defective Fuse 2, remove Fuse 1 prior to removing the
Fuse 2. Loosen the four screws (shown in Figure 4-3 on page 53) to lift and remove the circuit board from top case.
6 Gently remove the defective Fuse 2 by prying one end of the fuse loose and
removing it out of the fuse bracket, see Figure 4-3 on page 53.
7 Replace a new fuse of the same size and rating into the center of the fuse
holder.
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Service and Maintenance 4
Fuse 2 (11 A/1000 V)
Rotary switch
Figure 4-3 Fuse 2 replacement
8 Ensure that the rotary switch position is aligned with the align marking on the
top case and circuit board switch stay on the OFF position.
9 Then refasten the circuit board and the bottom cover respectively.
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4 Service and Maintenance
WARNING

Troubleshooting

To avoid electrical shock, do not perform any service unless you are qualified to do so.
If the instrument fails to operate, check the batteries and test leads, and replace them if necessary. If the instrument still does not function, check the identification procedures as described in Table 4 -1.
Tab le 4-1 Basic troubleshooting hints
Malfunction Identification
No LCD display after power ON
No beeper tone Check setup mode and verify if the beeper is set to OFF. Then select the desired driving frequency.
Failed on current measurement
Check the battery polarity and replace batteries if necessary. Ensure that the replaced batteries are new batteries, it is recommended not to mix old batteries with new batteries.
Check the fuse.
When servicing, use the specified replacement parts only. The Table 4-2 shows the replacement part numbers.
Tab le 4-2 List of replacement part number
Part number Description
U1241-44407 U1241AN front housing
U1241-64401 Bottom case and lens assembly
U1241-46401 Battery cover
U1241-44701 Multimeter stand
U1241-60002 LCD display
2110-1400 Fast blow fuse 1000 V, 0.44 A (10 mm x 35 mm)
2110-1402 Fast blow fuse 1000 V, 11 A (10 mm x 35 mm)
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Returning Instrument for Service

NOTE
Before shipping your instrument for repair or replacement, Keysight recommends that you acquire the shipping instructions from the Keysight Technologies Service Center. A clear understanding of the shipping instructions is necessary to secure your product for shipment.
1 Write the following information on a tag and if attach to the instrument.
– Name and address of owner
– Instrument model number
– Instrument serial number
– Description of the service required or failure indications
2 Remove all accessories from the instrument. Do not include accessories unless
they are associated with the failure symptoms.
3 Protect the instrument by wrapping it in plastic or heavy paper.
4 Pack the instrument in foam or other shock absorbing material and place it in a
strong shipping container.
You are recommended to use the original shipping material or order materials from a Keysight Technologies Sales Office. If both options are not available, place 8 cm to 10 cm (3 inches to 4 inches) of shock-absorbing and static-free packaging material around the instrument to avoid movement during shipping.
5 Seal the shipping container securely.
Service and Maintenance 4
6 Mark the shipping container as FRAGILE.
In the ensuing correspondence, refer to the instrument by its model number and full serial number.
Keysight suggests that you always insure your shipments.
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide
5 Performance Tests and
Calibration
Calibration Overview 58 Recommended Test Equipment 59 Basic Operating Test 60 Calibration Process 62 Test Considerations 63 Performance Verification Tests 64 Calibration Security 68 Adjustment Considerations 71 Calibration Adjustments 73 Calibration Count 79 Calibration Errors 80
This chapter contains procedures of performance verification tests and calibration adjustments. The performance tests is to ensure the multimeter is operating within its published specifications.
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5 Performance Tests and Calibration
NOTE

Calibration Overview

Ensure that you have read “Test Considerations” on page 63 before calibrating the multimeter.

Closed-case Electronic Calibration

The multimeter features closed-case electronic calibration. No internal mechanical adjustments are required. The multimeter calculates correction factors based upon the input reference value you set. The new correction factors are stored in non-volatile memory until the next calibration adjustment is performed. Non-volatile EEPROM calibration memory does not change when power has been off.

Calibration Interval

A 2-year interval is adequate for most applications. Keysight does not recommend extending calibration intervals beyond 2 years for any application.

Adjustment is Recommended

Specifications are only guaranteed within the period stated from the last adjustment. Whatever calibration interval you select, Keysight recommends that complete re-adjustment should always be performed at the calibration interval. This will assure that the U1241AN will remain within specification for the next calibration interval. This criteria for re-adjustment provides the best long–term stability. Performance data is measured during performance verification tests and does not guarantee that the multimeter will operate within the test limits unless the adjustment is performed.
Refer to “Calibration Count” on page 79 to verify that all adjustments have been performed.
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Performance Tests and Calibration 5

Recommended Test Equipment

The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact equipment is not available, substitute the calibration standards of equivalent accuracy.
Tab le 5-1 Recommended test equipment
Application Recommended Equipment Recommended Accuracy Requirements
DC Voltage Fluke 5520A < 1/5 instrument 1 year specifications
DC Current Fluke 5520A < 1/5 instrument 1 year specifications
AC Voltage Fluke 5520A < 1/5 instrument 1 year specifications
AC Current Fluke 5520A < 1/5 instrument 1 year specifications
Resistance Fluke 5520A < 1/5 instrument 1 year specifications
Frequency Fluke 5520A < 1/5 instrument 1 year specifications
Capacitance Fluke 5520A < 1/5 instrument 1 year specifications
Diode Fluke 5520A < 1/5 instrument 1 year specifications
Fluke 5520A < 1/5 instrument 1 year specifications
Temperature
Short Pomona MDP-S < 1/5 instrument 1 year specifications
TM Electronics KMPC1MP (K-Type thermocouple extension)
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5 Performance Tests and Calibration

Basic Operating Test

Basic Operating Test is used to test the basic operability of the multimeter. Repair is required if the multimeter fails the Basic Operating Test.

Backlight test

To test the backlight function, press to turn backlight ON at medium level of brightness intensity. Press again to toggle the highest level of brightness intensity. The backlight turns OFF automatically after setting period. Alternatively,
you can press for the third time to turn the backlight OFF.

Testing the display

To view all segments of the display, press and hold the button while turning the rotary switch from OFF to any non-OFF position. Compare the display with the
Figure 5-1.
Figure 5-1 Annunciator display
60 Keysight U1241AN User’s and Service Guide
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Input-A Terminal Test

NOTE
This test determines if the input warning of the A current terminal test is functioning properly. The multimeter sounds an alerting beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the corresponding A location. The display indicates a flashing AErr annunciator until the test lead is removed from the A input terminal.

Input-mA Terminal Alert Test

This test determines if the detected input voltage level is within the accepted boundaries when the μA/mA input terminal is connected. The multimeter sounds an alerting beep when the μA/mA input terminal detects a voltage level of higher than 1.6 V. The display indicates a flashing CErr annunciator until the test lead is removed from the μA/mA input terminal.
The alerting beep will continue to function even if the beep function is disabled.
Performance Tests and Calibration 5
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5 Performance Tests and Calibration

Calibration Process

1 Prior to performing the verification tests, see “Test Considerations” on
page 63.
2 Perform the verification tests to characterize the multimeter, see “Performance
Verification Tests” on page 64.
3 Unsecure the multimeter for calibration, see “Calibration Security” on page 68.
4 Prior to performing the adjustments, see “Adjustment Considerations” on
page 71.
5 Perform the adjustment procedures, see “Calibration Adjustments” on
page 73.
6 Secure the multimeter against unauthorized calibration, see “Exiting
Adjustment Mode” on page 78. Ensure that the multimeter has quit the
Adjustment Mode and turned off.
7 Record the new security code and calibration count in the multimeter’s
maintenance records.
62 Keysight U1241AN User’s and Service Guide
Page 63

Test Considerations

Error may be induced by AC signals that are present on the input leads. Long test leads can also act as an antenna causing pick-up of AC signals.
For optimum performance, all procedures should comply with the following recommendations:
– Ensure that the calibration ambient temperature is stable and between 18 °C
and 28 °C. Ideally the calibration should be performed at 23 °C ± 2 °C.
– Ensure that the ambient relative humidity (RH) is less than 80%.
– Ensure that the low battery indicator does not appear during the performance
verification test. If it does, replace the batteries to avoid any inaccurate reading.
– During temperature performance verification test, ensure that the multimeter
has been switched ON and placed in the test environment for at least one hour with a J/K-type thermo-couple connected between the multimeter and calibration source.
– Allow one minute warm-up period with a Shorting Plug connected to the V
and COM input terminals.
– Use shielded twisted pair Teflon-insulated cables to reduce settling and noise
errors. Keep the input cables as short as possible.
Performance Tests and Calibration 5
– Connect the input cable shields to earth ground. Except where noted in the
procedures, connect the calibrator LO source to earth ground at the calibrator. It is important that the LO to earth ground connection be made at only one place in the circuit to avoid ground loops.
During DC voltage, DC current, and resistance gain verification measurements, ensure that the calibrator's “0” output is correct. It is recommended to set the offset for each range of the measuring function being verified.
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5 Performance Tests and Calibration
NOTE

Input Connections

Test connections to the multimeter are best accomplished using the K-type thermocouple wire and mini-connectors for temperature measurement. The J-type thermocouple wire and mini-connectors can also be used for temperature measurements. Shielded, twisted-pair, Teflon interconnect cables of minimum length are recommended between the calibrator and the multimeter. Cable shields should be earth ground referenced. This configuration is recommended for optimal noises and settling time performance during calibration.

Performance Verification Tests

The performance verification tests are recommended as acceptance tests when you first receive the multimeter. The acceptance test results should be compared against the one year test limits. After acceptance, you should repeat the performance verification tests at every calibration interval.
If the multimeter fails performance verification, adjustment or repair is required. Adjustment is recommended at every calibration interval. If no adjustment is being performed, it is highly recommended to establish a ‘guard band’, using not more than 80% of the specifications, as the verification limits.
Users are highly recommended to read the “Test Considerations” on page 63 before performing performance verification tests.
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Performance Tests and Calibration 5
Tab le 5-2 Verification tests
Step Test Function Range 5520A Output
1000 mV 1000.0 mV ± 1.1 mV
Turn the rotary switch to
1
position
10 V 10.000 V ± 11 mV
100 V 100.00 V ± 110 mV
1000 V 1000.0 V ± 1.1 V
1000.0 mV, 1 kHz ± 10.4 mV
Error from nominal
1 year
U1241AN
2
Press to go to function
3
Press to go to frequency mode
4
Turn the rotary switch to position
1000 mV
10 V
100 V
1000 V
100 Hz 1.000 V, 70 Hz ± 31 mHz
1000 Hz 1.000 V, 1000 Hz ± 400 mHz
10 kHz 1.000 V, 2 kHz ± 1.6 Hz
Diode 1.000 V ± 5 mV
1000.0 mV, 2.5 kHz ± 20.4 mV
1000.0 mV, 20 kHz ± 20.4 mV
10.000 V, 1 kHz ± 104 mV
10.000 V, 2.5 kHz ± 204 mV
10.000 V, 20 kHz ± 204 mV
100.00 V, 1 kHz ± 1.04 V
100.00 V, 2.5 kHz ± 2.04 V
100.00 V, 20 kHz ± 3.03 V
1000.0 V, 1 kHz ± 10.4 V
1000.0 V, 2.5 kHz ± 30.3 V
Keysight U1241AN User’s and Service Guide 65
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5 Performance Tests and Calibration
Tab le 5-2 Verification tests (continued)
Step Test Function Range 5520A Output
100 Ω 100.00 Ω
1000 Ω 1000.0 Ω
10 kΩ 10.000 kΩ
5
Turn the rotary switch to position
100 kΩ 100.00 kΩ ± 330 Ω
1000 kΩ 1000.0 kΩ ± 3.3 kΩ
10 MΩ 10.000 MΩ ± 62 kΩ
100 MΩ 100.00 MΩ
1000 nF 1000.0 nF ± 10.3 nF
10 µF 10.000 µF ± 0.103 µF
Error from nominal
1 year
U1241AN
± 3.3 Ω
± 33 Ω
[a]
[a]
[a]
[b]
± 0.33 Ω
± 1.53 MΩ
6
Turn the rotary switch to position
100 µF 100.00 µF ± 1.03 µF
1000 µF 1000.0 µF ± 10.3 µF
10 mF 10.000 mF 0.103 mF
1000 µA 1000.0 µA ± 2.3 µA
7
Turn the rotary switch to position
10000 µA 10000 µA ± 23 µA
1000 µA 1000.0 µA, 2 kHz ± 10.2 µA
8
Press to go to function
10000 µA 10000 µA, 2 kHz ± 102 µA
100 mA 100.00 mA ± 0.23 mA
9
Turn the rotary switch to position
440 mA
400.0 mA
[c]
± 1.1 mA
100 mA 100.00 mA, 2 kHz ± 1.02 mA
10
Press to go to function
11
Turn the rotary switch to position
12
Press to go to function
13
Turn the rotary switch to position
440 mA
10 A
10 A
100 mV 100.00 mV ± 0.11 mV
400 mA
10.000 A
10.000 A
[c]
, 2 kHz
[d]
[d]
, 2 kHz
± 4.2 mA
± 33 mA
± 102 mA
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Performance Tests and Calibration 5
Tab le 5-2 Verification tests (continued)
Step Test Function Range 5520A Output
100.00 mV, 1 kHz ± 1.04 mV
14
Press to go to function
100 mV
100.00 mV, 2.5 kHz ± 2.04 mV
100.00 mV, 20 kHz ± 2.04 mV
Error from nominal
1 year
U1241AN
15
Press to go to T1 function
[e]
–40 ºC until
[f]
1000 ºC
0 ºC ± 1ºC
1000 ºC ± 11ºC
[a] The accuracy of 100 Ω to 10 kΩ are specified after math Null, that is used to subtract the test lead resistance and the thermal effect.
[b] For the range of 100 MΩ, the RH is specified for <60%.
[c] Current can be measured from 50 mA to 440 mA continuously. An addition of 0.2% to the specified accuracy when measuring a signal greater
than 440 mA to 1100 mA for 30 seconds maximum. After measuring > 440 mA current, cool down the multimeter for twice the measuring time taken before proceeding for low current measurement.
[d] Current can be measured from 0.5 A up to 10 A continuously with the maximum opera ting temperature of 50 ºC. An addition 0.3% needs to be
added to the specified accuracy if the signal measured is in the range of 10 A to 19.999 A for 15 seconds maximum. After measuring a current of > 10 A, leave the multimeter to cool down for 60 seconds before applying low current measurement.
[e] — Set both Fluke 5520A and multimeter to internal reference.
— Prior to performing measurements, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A
TC output, and the other end to a precision thermometer to verify that the source outputs the desired value. Adjust the source accordingly if necessary.
— To perform the measurement, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to the multimeter via a TC-to-banana adapter. Allow at least 1 hour for the multimeter to stabilize.
[f] The multimeter should be ON for at least 1 hour before measurements are taken. The accuracy does not include the tolerance of the
thermocouple probe. When measuring temperature with respect to any temperature calibrator, set both the calibrator and multimeter with external reference (without internal ambient compensation 0 ºC). If both calibrator and multimeter are set with internal reference (with internal ambient compensation), deviation may be present between the readings of the calibrator and multimeter.
–40 ºC ± 1.4 ºC
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5 Performance Tests and Calibration
NOTE

Calibration Security

The calibration security code prevents accidental or unauthorized adjustments to the multimeter. The multimeter is secured when the multimeter is shipped from factory. Before performing any adjustment to the multimeter, you are required to unsecure the multimeter by entering the correct security code (see “Unsecuring
the Multimeter for Calibration” on page 68). The security code may contain up to
4 numeric characters.
You can unsecure and change the security code from the multimeter front panel. If you forgot your security code, see “Unsecuring the multimeter without the
security code” on page 70.

Unsecuring the Multimeter for Calibration

Before performing adjustment to the multimeter, you are required to unsecure the multimeter by entering the correct security code. The security code is set to 1234 when the multimeter is shipped from the factory. The security code is stored in non-volatile memory, and does not change when power is off.
Unsecuring the multimeter from the front panel
1 Turn the rotary switch to .
2 Press and simultaneously to enter the Calibration Security Code
entry mode. The primary display shows 5555 and the secondary display shows SEU.
3 Press or to step each character in the code. Press or to change
the value of the selected character.
4 Press (Save) when done.
5 If the correct security code is entered, the secondary display will show “PAS”.
If an invalid code is entered, the multimeter will shows error code “E02” on the secondary display for approximately 3 seconds before returning to the Calibration Security entry mode.
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Performance Tests and Calibration 5
Changing the multimeter calibration security code from the front panel
1 When the multimeter is in the unsecured mode, press button for more
than one second to enter Calibration Security Code setting mode.
2 The factory default calibration security code 1234 will be displayed on primary
display.
3 Press or to step each character in the code. Press or to change
the value of the selected character.
4 Press (Save) button, to store new calibration security code.
5 If the new calibration security code has been successfully stored, the
secondary display will show PASS. If the new code failed to save, the multimeter will shows error code E07 on the secondary display for approximately 3 seconds before returning to the Calibration Security Code setting mode.
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5 Performance Tests and Calibration
Unsecuring the multimeter without the security code
1 Record the last 4 digit serial numbers of the multimeter.
2 Turn the rotary switch to .
3 Press and simultaneously to enter the Calibration Security Code
entry mode. The primary display shows 5555 and the secondary display shows SEC.
4 Press for more than one second to enter Set Default Security Code
mode. The secondary display shows SEr and primary display shows “5555”.
5 Press or to step each character in the code. Press and to
change the value of the selected character.
6 Set the last 4 digit serial number of the multimeter. Press (Save) to
confirm the entry.
7 If the 4 digit serial number entered is correct, the secondary display will show
PAS. If an invalid code is entered, the multimeter will shows error code E03.
Ensure that the last 4 digit serial number is entered correctly and repeat the step 1 to 7.

Using the Front Panel for Adjustments

This section describes the process used to perform adjustments from the front panel.
Selecting the Adjustment Mode
Unsecure the multimeter, see “Unsecuring the Multimeter for Calibration” on page 68 or “Unsecuring the multimeter without the security code” on page 70. Once the multimeter has been unsecured, the reference value will be indicated on the primary display.
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Entering Adjustment Values
NOTE
NOTE
1 Press and to step through each character in the primary display.
2 Press and to change the value of the corresponding character from
digits 0 through 9.
3 Apply the respective corresponding input signal from the recommended test
equipment in Table 5 -1.
4 Press (Save) when done to start calibration.
Ensure that the accuracy of the input signal adheres to the Valid Adjustment Input Values in Table 5-5.

Adjustment Considerations

After each adjustment, the secondary display shows PAS. If the calibration fails, the multimeter sounds a beep, and an error number is shown in the secondary display. Calibration error messages are described in “Calibration Errors” on page 80.
Performance Tests and Calibration 5
1 Allow the multimeter to warm up and stabilize for five minutes before
performing the adjustments.
2 Assure that the low battery indicator does not appear during the adjustment.
Replace the batteries to avoid inaccurate readings.
3 Consider the thermal effects of the test leads connected to the calibrator and
multimeter. It is recommended to wait for one minute before start performing the calibration.
4 During ambient temperature adjustment, ensure that the multimeter has been
turned on for at least one hour with K-type thermocouple connected between the multimeter and calibration source.
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5 Performance Tests and Calibration
CAUTION
Do not power off the multimeter during ad justments, as this may delete the calibration memory for the present function.

Valid Adjustment Input Values

Adjustment can be accomplished using the following input values below.
Tab le 5-3 Valid adjustment input values
Function Range Valid Input Reference Val ues
1000 mV, 10 V, 100 V, 1000 V 0.9 to 1.1 x full scale
1000 mV, 10 V, 100 V, 1000 V 0.9 to 1.1 x full scale
1 V 0.9 to 1.1 x full scale
1000 Ω, 10 kΩ, 100 kΩ, 1000 kΩ, 10 MΩ
1000 nF, 10 μF, 100 μF, 1000 μF, 10 mF 0.9 to 1.1 x full scale
1000 μA, 10000 μA 0.9 to 1.1 x full scale
100 mA, 1000 mA 0.9 to 1.1 x full scale
10 A 0.9 to 1.1 x full scale
0.9 to 1.1 x full scale
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Performance Tests and Calibration 5
CAUTION
NOTE
Tab le 5-3 Valid adjustment input values (continued)
Function Range Valid Input Reference Val ues
T1 0 °C
DCmV (T1)
100 mV 0.9 to 1.1 x full scale
The minimum AC current output of the Fluke 5520A calibrator is 29 µA. Ensure that at least 50

Calibration Adjustments

Review the Test Considerations and Ad justment Considerations before beginning the adjustment procedures.
1 Turn the rotary switch to the respective test function position, as shown in
Table 5-3.
2 After unsecuring the multimeter, the multimeter will go into the adjustment
mode, see “Unsecuring the Multimeter for Calibration” on page 68.
3 The primary display will show the reference value of the calibration items
(Cal Item). Configure each Cal Item shown in the input reference values in
Table 5-3.
Ensure that 0 °C with ambient compensation is provided
µA is set at the calibrator source of AC µA.
4 Use the and arrow keys to select the calibration range (Cal Range).
5 Apply the input signal as shown in the Input Reference Value column of the
Table 5-3. The bar graph will display the input reading. There is no bar graph
display for temperature adjustment.
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5 Performance Tests and Calibration
NOTE
NOTE
You are highly recommended to complete the adjustments in the same order as shown in Table 5-3.
6 Enter the actual applied input, see “Entering Adjustment Values” on page 71.
7 Press to start the adjustments. The CAL flashes in the secondary display
indicating the calibration is in progress.
8 Upon completion of each adjustment value, the secondary display will show
PAS. If the adjustment failed, the multimeter will sound a long beep and the
calibration error number appears in the secondary display. The primary display remains at the current Cal Item.
If the adjustment failed, check the input value, range, function, and entered adjustment value and repeat the adjustment steps.
9 Turn the rotary switch to the next function according to the Test Function
column shown in Table 5-3. Repeat step 3 to step 8 for each adjustment point shown in the calibration adjustment, see Table 5-4.
10 Verify the adjustments using the “Performance Verification Tests” on page 64.
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Tab le 5-4 Calibration ad justments
Performance Tests and Calibration 5
Step Test function Cal range Input reference value
Dual banana plug with
1
Turn the rotary switch to position
2
Press to go to function
Short
1000 mV 1 V 1000.0 mV
10 V 10 V 10.000 V
100 V 100 V 100.00 V
1000 V 1000 V 1000.0 V
1000 mV
10 V
100 V
copper wires short between two terminals
30 mV, 70 Hz 30.0 mV
1000 mV, 70 Hz 1000.0 mV
1000 mV, 10 kHz 1000.0 mV
0.5 V, 70 Hz 0.500 V
10 V, 70 Hz 10.000 V
10 V, 10 kHz 10.000 V
5 V, 70 Hz 5.00 V
100 V, 70 Hz 100.00 V
Cal item
U1241AN
SHrt
100 V, 2.5 kHz 100.00 V
50 V, 70 Hz 50.0 V
3
Turn the rotary switch to position
1000 V
Short
1 V 1 V 1.000 V
1000 V, 70 Hz 1000.0 V
1000V, 1 kHz 1000.0 V
Dual banana plug with copper wires short between two terminals
SHrt
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5 Performance Tests and Calibration
Tab le 5-4 Calibration adjustments (continued)
Step Test function Cal range Input reference value
Dual banana plug with
4
Turn the rotary switch to position
5
Turn the rotary switch to position
Short
10 MΩ
1000 kΩ 1000 kΩ 1000.0 kΩ
100 kΩ 100 kΩ 100.00 kΩ
10 kΩ 10 kΩ 10.000 kΩ
1000 Ω 1000 Ω 1000 Ω
Open
1000 nF
10 μF 10 μF 10.000 μF
copper wires short between two terminals
Input terminals open (remove all test leads and shorting plugs from input terminals)
10 MΩ 10.000 MΩ
Input terminals open (remove all test leads and shorting plugs from input terminals)
400 nF 400.0 nF
1000 nF 1000.0 nF
Cal item
U1241AN
SHrt
oPEn
oPEn
100 μF 100 μF100.00 μF
1000 μF 1000 μF 1000.0 μF
10 mF 10 mF 10.000 mF
Input terminals open (remove all test leads and shorting plugs from input terminals)
oPEn
6
Turn the rotary switch to position
Open
1000 μA 1000 μA 1000.0 μA
10000 μA 10000 μA 10000 μA
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Tab le 5-4 Calibration ad justments (continued)
Performance Tests and Calibration 5
Step Test function Cal range Input reference value
50 μA, 70 Hz 50.0 μA
Press to go to function
7
8
Turn the rotary switch to
9
Press to go to function
1000 μA
10000 μA
Open
position
100 mA 100 mA 100.00 mA
1000 mA 320 mA 320.0 mA
100 mA
1000 mA
100 μA, 70 Hz 100.0 μA
1000 μA, 70 Hz 1000.0 μA
1000 μA, 70 Hz 1000 μA
10000 μA, 70 Hz 10000 μA
Input terminals open (remove all test leads and shorting plugs from input terminals)
5 mA, 70 Hz 5.00 mA
10 mA, 70 Hz 10.00 mA
100 mA, 70 Hz 100.00 mA
100 mA, 70 Hz 100.0 mA
320 mA, 70 Hz 320.0 mA
Cal item
U1241AN
oPEn
Move the test lead from “μA.mA” and “COM” terminal to “A” and “COM” terminal
Caution: Connect the calibrator to the multimeter's “A” and “COM” terminal before applying 10 A
Input terminals open (remove all test leads and shorting plugs from input terminals)
oPEn
10
Turn the rotary switch to position
Open
10 A 10 A 10.000 A
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5 Performance Tests and Calibration
Tab le 5-4 Calibration adjustments (continued)
Step Test function Cal range Input reference value
0.5 A, 70 Hz 0.500 A
11
Press to go to function
12
Turn the rotary switch to position
13
Press to go to func tion
14
Press to go to
[a] — Set the 5520A to internal reference.
— Prior to performing adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to a precision thermometer to verify that the source outputs the desired value. Adjust the source accordingly if necessary.
— To perform the adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to the multimeter via a TC-to-banana adapter. Allow at least 1 hour for the multimeter to stabilize.
T1 function
[a]
10 A
Short
100 mV 100 mV 100.00 mV
100 mV
K-type 0 ºC 000.0 ºC
1 A, 70 Hz 1.000 A
10 A, 70 Hz 10.000 A
Dual banana plug with copper wires short between two terminals
3 mV, 70 Hz 3.00 mV
100 mV, 70 Hz 100.00 mV
Cal item
U1241AN
SHrt

Exiting Adjustment Mode

1 Remove all shorting plugs and connectors from the multimeter.
2 Record the new Calibration Count, see “Calibration Count” on page 79.
3 Press and simultaneously to exit the Adjustment Mode. Power off
and on the multimeter to return to normal measurement mode and secured.
78 Keysight U1241AN User’s and Service Guide
Page 79

Calibration Count

NOTE
The multimeter provides the calibration count information for you to access through front panel operation. Note that the multimeter was calibrated prior to shipping out to users.
You are recommended to record the initial value of the calibration count once receiving the multimeter.
The count value increases by one for each calibration point, from 0000 up to the maximum of 19999. After the maximum count, the calibration count will reset to
0. The calibration count can be read from the front panel after the multimeter has been unsecured:
1 In adjustment mode, press and hold for more than one second to view
the calibration count viewing mode. The primary display indicates the calibration count value while the secondary display indicates “Cnt”.
2 Take note of the calibration count to keep track of the number of calibration
counts that has been performed.
Performance Tests and Calibration 5
3 Press and hold for more than one second to exit the calibration count
mode.
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5 Performance Tests and Calibration

Calibration Errors

The following error codes indicate failures that may occur during a calibration. The error code is displayed on the secondary display.
Tab le 5-5 Calibration error codes
Code Descriptions
200 Calibration error: Calibration mode is secured
E02 Calibration error: Invalid secure code
E03 Calibration error: Invalid serial number code
E04 Calibration error: Calibration aborted
E05 Calibration error: Value out of range
E06 Calibration error: Signal measurement out of range
E07 Calibration error: Frequency out of range
E08 EEPROM write failure
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Keysight U1241AN Handheld Digital Multimeter User’s and Service Guide
6 Specifications and
Characteristics
For the characteristics and specifications of the U1241AN Handheld Digital Multimeter, refer to the datasheet at http://literature.cdn.keysight.com/litweb/
pdf/5989-7040EN.pdf.
81
Page 82
6 Specifications and Characteristics
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
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Index

A
adjustment, 58
consideration
, 78
mode
auto range
, 26
B
backlight
test
, 60
timer
bar graph
bar graph count battery bracket brightness
, 47
analog, 24
, 42, 50
, 52
, 60
C
calibration
adjustments
, 58
interval overview process
security capacity CE
, 8
closed-case condensation configuration connections
terminal, 27 container
, 7
CSA
, 58 , 62 , 65, 75
, 42
, 58
, 7
, 46
, 55
D
data
display
, 37
hold logging
, 39
annunciator, 60 backlight
, 47
, 71
, 24
, 73
E
EMC, 7 equipotentiality
, 3
F
fast-acting, 27 flammable fragile front panel fuse
, 4
, 55
, 22
, 52
H
housing, 54 humidity
, 7, 63
I
IEC, 7 input
connections, 64 terminal
values insulation introduction
, 26
, 72
, 4
, 20
J
J-type, 47, 64
K
key features, 20
, 25
keypad K-type
, 47
L
logging
interval
, 40
manual
, 39
M
maintenance, 50 measuring
% Scale, 31 capacitance current frequency resistance temperature test continuity voltage
moisture
, 34
, 30
, 32
, 32
, 35
, 32
, 30
, 36, 50
N
non-volatile, 68 null
, 38
O
overload, 43
P
percentage, 42, 47 performance
, 64
R
RCM, 8 readings recording refresh hold regulatory relative removing replacement residual returning reviewing rotary switch
, 20
, 36
, 37
, 8
, 38
, 41
, 50, 52
, 34
, 55
, 41
, 22, 23, 25
Keysight U1241AN User’s and Service Guide 83
Page 84
S
safety, 3 scale
, 31
security serial shipping switch counter symbols
, 68
, 55, 80
, 21
, 3
T
test
connections equipment function
verification thermocouple timer tips
, 34, 35
trigger hold troubleshooting True-RMS
, 65
, 47
, 37
, 20
W
warm-up, 63 warning WEEE
, 43
, 8
, 25
, 64
, 59
, 64
, 47
, 54
84 Keysight U1241AN User’s and Service Guide
Page 85
This information is subject to change without notice. Always refer to the Keysight website for the latest revision.
© Keysight Technologies 2008 - 2016 Edition 9, July 30, 2016
Printed in Malaysia
*U1241-90038*
U1241-90038
www.keysight.com
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