Page 1
Keysight U1450 Series
Insulation Testers and
U1461A Insulation
Multimeter
Service Guide
Page 2
Notices
CAUTION
WARNING
Copyright Notice
© Keysight Technologies 2015-2017
No part of this manual may be
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
U1451-90014
Edition
Edition 5, 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 U1450 Series/U1461A Service Guide
Page 3
Safety Symbols
CAT III
CAT IV
600 V
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) Caution, risk of electric shock
Alternating current (AC)
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Both direct and alternating current
Earth (ground) terminal
Equipment protected throughout by
double insulation or reinforced
insulation
Category III 1000 V overvoltage
protection
Category IV 600 V overvoltage
protection
Do not use in distribution systems with
voltages higher than 600 V
U1450 Series/U1461A Service Guide 3
Page 4
Safety Considerations
WARNING
Read the information below before using this tester. The descriptions and
instructions in this manual apply to the Keysight U1461A Insulation Multimeter
and the U1450 Series Insulation Tester.
The word tester is used to represent both models.
– Do not use the tester if it is damaged. Before you use the tester, inspect
the case. Look for cracks or missing plastic. Pay particular attention to
the insulation surrounding the connectors.
– Inspect the test leads for damaged insulation or exposed metal. Check
the test leads for continuity. Replace damaged test leads before you use
the tester.
– Do not operate the tester around explosive gas, vapor, or wet
environments.
– Do not apply more than the rated voltage (as marked on the tester)
between terminals, or between terminal and earth ground.
– Before use, verify the tester's operation by measuring a known voltage.
– When servicing the tester, use only the specified replacement parts.
– Use caution when working above 60 V
Such voltages pose a shock hazard.
– When using the probes, keep your fingers behind the finger guards on the
probes.
– Connect the common test lead before you connect the live test lead.
When you disconnect the leads, disconnect the live test lead first.
– Remove the test leads from the tester before you open the battery cover.
– Do not operate the tester with the battery cover or portions of the cover
removed or loosened.
– To avoid false readings, which may lead to possible electric shock or
personal injury, replace the battery as soon as the low battery indicator
appears and flashes.
4 U1450 Series/U1461A Service Guide
DC, 30 VAC RMS, or 42.4 V peak.
Page 5
WARNING
– Ensure that you do not perform insulation resistance tests in distribution
CAUTION
systems with voltages higher than 600 V.
– For insulation resistance tests, ensure that you select a suitable test
voltage for the equipment to be tested.
For model U1461A only:
– When measuring current, turn off the circuit power before connecting the
tester in the circuit. Remember to place the tester in series with the
circuit.
– Be aware of the presence of hazardous voltage before using the Low Pass
Filter (LPF) function for voltage measurement. Voltages measured are
usually greater than the values indicated on the tester as the voltages
with higher frequencies have been filtered through the LPF function.
– Disconnect circuit power and discharge all high-voltage capacitors
before testing resistance, continuity, diodes, or capacitance.
– Use the proper terminals, function, and range for your measurements.
– This device is for use at altitudes of up to 2,000 m.
– Always use the specified battery type. The power for the tester is
supplied by four 1.5 V AA batteries. Observe the correct polarity markings
before you insert the batteries to ensure proper insertion of the batteries
in the tester.
U1450 Series/U1461A Service Guide 5
– You are advised to use low leakage batteries when changing to new
batteries. Please remember to remove the batteries when the tester is not
in use for a long period of time. Warning on the risk of battery leakage.
For model U1461A only:
– Never measure voltage when current measurement is selected.
Page 6
Environmental Conditions
NOTE
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 Requirement
Temperature
Operating condition
– –40 °C to 55 °C, 0% to 80% RH (using lithium batteries),
>1 hour operating time
– –20 °C to 55 °C, 0% to 80% RH (using alkaline batteries),
20 minutes operating time
Storage condition
– –40 °C to 70 °C, 0% to 80% RH (without batteries)
[a]
[a]
Humidity
Altitude Up to 2,000 meters
Pollution degree Pollution degree II
[a] The operating time is defined when the tester stays at a temperature of 20 °C, and then it is moved to colder
environment of –40 °C for short period of time. The operating temperature of the battery should be allowed from
–20 °C or –40 °C. You should monitor the ambient temperature sensed by the tester. The tester is operational if
the temperature display is not less than –20 °C or –40 °C, according to battery type.
Full accuracy up to 80% RH for temperatures up to 30 °C,
decreasing linearly to 50% RH at 55 °C
The U1461A Insulation Multimeter and U1453A Insulation Tester complies with
the following safety and EMC requirements:
– Safety compliance
– Designed in compliance to IEC/EN 61010-1:2010 for Category III 1000 V
and Category IV 600 V
– Designed in compliance to IEC/EN 61557-1, IEC/EN 61557-2, and IEC/
EN 61557-4
– EMC compliance
– Commercial limits compliance with IEC 61326-1:2005/EN 61326-1:2006
6 U1450 Series/U1461A Service Guide
Page 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.
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 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.
This instrument complies with the
WEEE Directive (2002/96/EC)
marking requirement. This affixed
product label indicates that you must
not discard this electrical or
electronic product in domestic
household waste.
This symbol indicates the time period
during which no hazardous or toxic
substance elements are expected to
leak or deteriorate during normal use.
Forty years is the expected useful life
of the product.
U1450 Series/U1461A Service Guide 7
Page 8
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/insulationtesters
(product-specific information and support, software and
documentation updates)
– www.keysight.com/find/assist
(worldwide contact information for repair and service)
8 U1450 Series/U1461A Service Guide
Page 9
Table of Contents
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1 Calibration Procedures
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Closed-case calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Keysight calibration services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Adjustment is recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Calibration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Test Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Performance Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Performance verification tests for U1452A/U1452AT/U1451A . . . .21
Performance verification tests for U1461A/U1453A . . . . . . . . . . . . .25
Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Unsecuring the Instrument for Calibration . . . . . . . . . . . . . . . . . . . . . .32
To unsecure the instrument from the front panel . . . . . . . . . . . . . . .32
To change the calibration security code . . . . . . . . . . . . . . . . . . . . . .33
To reset the calibration security code to its factory default . . . . . . .33
Using the Front Panel for Adjustments . . . . . . . . . . . . . . . . . . . . . . . . .35
Adjustment considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Valid adjustment input values (U1452A/U1452AT/U1451A) . . . . . . 36
Valid adjustment input values (U1453A) . . . . . . . . . . . . . . . . . . . . . .38
U1450 Series/U1461A Service Guide 9
Page 10
Valid adjustment input values (U1461A) . . . . . . . . . . . . . . . . . . . . . 42
Adjustment procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Non-Contact Voltage (NCV) Calibration . . . . . . . . . . . . . . . . . . . . . 47
Exiting the adjustment mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Calibration Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Calibration Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
2Service and Maintenance
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Returning the Instrument for Service . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
To order replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Types of Service Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Extended service contracts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Obtaining Repair Service (Worldwide) . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10 U1450 Series/U1461A Service Guide
Page 11
List of Figures
Figure 1-1 Connecting the U1450 Series/U1461A to the M191 . 30
Figure 1-2 Connecting the U1450 Series/U1461A for 6 Ω EBR
measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
U1450 Series/U1461A Service Guide 11
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12 U1450 Series/U1461A Service Guide
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List of Tables
Table 1-1 Recommended test equipment . . . . . . . . . . . . . . . . . . 18
Table 1-2 Performance verification tests (U1452A/U1452AT/
U1451A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Table 1-3 Performance verification tests for models U1461A/
U1453A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Table 1-4 Adjustment input values (U1452A/U1452AT/
U1451A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Table 1-5 Adjustment input values (U1453A) . . . . . . . . . . . . . . .38
Table 1-6 Adjustment input values (U1461A) . . . . . . . . . . . . . . .42
Table 1-7 Calibration error codes . . . . . . . . . . . . . . . . . . . . . . . . .50
Table 2-1 Operating checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .52
U1450 Series/U1461A Service Guide 13
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14 U1450 Series/U1461A Service Guide
Page 15
U1461A Insulation Multimeter/U1453A Insulation Tester
Service Guide
1 Calibration Procedures
Calibration Overview 16
Recommended Test Equipment 18
Calibration Process 19
Test Considerations 20
Performance Verification Tests 21
Calibration Security 31
Unsecuring the Instrument for Calibration 32
Using the Front Panel for Adjustments 35
Calibration Count 49
Calibration Error Codes 50
15
Page 16
1 Calibration Procedures
NOTE
Calibration Overview
This manual contains procedures to verify the U1450 Series insulation testers/
U1461A insulation multimeter performance and to perform adjustments
(calibration). The performance test procedures allow you to verify that the
instrument is operating within its published specifications. The adjustment
procedures ensure that the instrument remains within its specifications until the
next calibration.
Ensure that you have read the “Test Considerations” on page 20 before
calibrating the instrument.
Closed-case calibration
The instrument features closed-case electronic calibration. In other words, 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 nonvolatile memory until the next calibration
adjustment is performed. The nonvolatile EEPROM calibration memory is retained
even when the power is switched off.
Keysight calibration services
When your instrument is due for calibration, contact your local Keysight Service
Center to enquire about recalibration services.
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 2 years for any
application.
16 U1450 Series/U1461A Service Guide
Page 17
Adjustment is recommended
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 ensure that the
instrument will remain within the specifications until 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 the “Calibration Count” on page 49 and verify that all the adjustments
have been performed.
Calibration Procedures 1
U1450 Series/U1461A Service Guide 17
Page 18
1 Calibration Procedures
Recommended Test Equipment
The test equipment recommended for the performance verification and
adjustment procedures are listed below (Table 1-1). If the exact instrument is not
available, substitute with another calibration standard of equivalent accuracy.
A suggested alternative method is to use the Keysight 3458A 8½ Digit Digital
Multimeter to measure less accurate but stable sources. The output value
measured from the source can be entered into the instrument as the target
calibration value.
Tab le 1-1 Recommended test equipment
Application
DC voltage Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
AC voltage Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
Capacitance Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
Frequency Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
Earth-bond resistance Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
Resistance Fluke 5520A/5522A <20% of the instrument’s 1-year specifications
Insulation resistance M191 <20% of the instrument’s 1-year specifications
Earth-bond resistance
(6 Ω range)
Recommended
equipment
Vishay RS Resistor
5.0 Ω
Recommended accuracy requirements
– Absolute uncertainty specifications ±(% of reading)
–5.0 Ω ± 0.5%
18 U1450 Series/U1461A Service Guide
Page 19
Calibration Process
1 Prior to performing the verification tests, see “Test Considerations” on
page 20.
2 Perform the verification tests to characterize the instrument; see “Performance
Verification Tests” on page 21.
3 Unsecure the instrument for calibration; see “Unsecuring the Instrument for
Calibration” on page 32.
4 Prior to performing the adjustments, see “Adjustment considerations” on
page 35.
5 Perform the adjustment procedure; see “Adjustment procedure” on page 46.
6 Secure the instrument against unauthorized calibration; see “Exiting the
adjustment mode” on page 48. Ensure that the instrument has quit the
adjustment mode and is turned off.
7 Record the new security code and calibration count in the instrument's
maintenance records.
Calibration Procedures 1
U1450 Series/U1461A Service Guide 19
Page 20
1 Calibration Procedures
Test Considerations
For optimum performance, all procedures should comply with the following
recommendations:
– The performance verification test or adjustment should be performed under
laboratory conditions where the ambient temperature can be controlled.
– The instrument should be put under the laboratory environment for at least
1 hour.
– Ensure that the calibration ambient temperature is stable and is between 18 °C
and 28 °C. Ideally the calibration should be performed at 23 °C ± 1 °C.
– Ensure that the ambient relative humidity is less than 80%.
– Allow a warm-up period of 3 minutes.
– Use a shielded twisted pair of PTFE-insulated cables to reduce settling and
noise errors. Keep the input cables as short as possible. Long test leads can
also act as antennas which may pick up AC signals.
– Connect the input cable shields to earth ground.
20 U1450 Series/U1461A Service Guide
Page 21
Performance Verification Tests
NOTE
Use the performance verification tests to verify the measurement performance of
the instrument. The performance verification tests use the instrument's
specifications listed in the U1461A/U1453A User's Guide and the U1452A/
U1452AT/U1451A User’s Guide (available for download at www.keysight.com/
find/hhTechLib).
The performance verification tests are recommended as acceptance tests when
you first receive the instrument. The acceptance test results should be compared
against the 1 year test limits. After acceptance, you should repeat the
performance verification tests at every calibration interval.
If the instrument fails the performance verification tests, adjustment or repair is
required.
Ensure that you have read the “Test Considerations” on page 20 before running
the performance verification tests.
Performance verification tests for U1452A/U1452AT/U1451A
Calibration Procedures 1
Tab le 1-2 Performance verification tests (U1452A/U1452AT/U1451A)
Step Test function Range
1
DCV Turn the rotary switch
to the position.
U1450 Series/U1461A Service Guide 21
6 V 6 V ±0.032 V ±0.014V
60 V 60 V ±0.32 V ±0.14 V
600 V 600 V ±3.2 V ±1.4 V
1000 V 1000 V ±7 V ±4 V
5520A/5522A
output
Error from nominal 1 year
U1451A U1452AT/U1452A
Page 22
1 Calibration Procedures
Tab le 1-2 Performance verification tests (U1452A/U1452AT/U1451A) (continued)
Step Test function Range
2
ACV Turn the rotary switch
to the position.
6 V
60 V
600 V
1000 V
3
Capacitance Turn the
rotary switch to the
position.
100 nF 100 nF ±3.2 nF ±3.2 nF
1 μF1 μF ±0.032 μF ±0.032 μF
10 μF 10 μF±0.32 μF ±0.32 μF
100 μF 100 μF ±10.2 μF ±10.2 μF
4
Resistance Turn the
rotary switch to the
position.
600 Ω
6 kΩ
60 kΩ
5520A/5522A
output
Error from nominal 1 year
U1451A U1452AT/U1452A
6 V, 45 Hz ±0.123 V ±0.123 V
6 V, 400 Hz ±0.123 V ±0.123 V
60 V, 45 Hz ±1.23 V ±1.23 V
60 V, 400 Hz ±1.23 V ±1.23 V
600 V, 45 Hz ±12.3 V ±12.3 V
600 V, 400 Hz ±12.3 V ±12.3 V
1000 V, 45 Hz ±23 V ±23 V
1000 V, 400 Hz ±23 V ±23 V
[a]
[a]
[a]
600 Ω ±9.3 Ω ±6.3 Ω
6000 Ω ±0.093 kΩ ±0.063 kΩ
60000 Ω ±0.93 kΩ ±0.63 kΩ
600 kΩ 600000 Ω ±9.3 kΩ ±6.3 kΩ
6 MΩ 6000000 Ω ±0.123 MΩ ±0.075 MΩ
60 MΩ 60000000 Ω ±1.53 MΩ ±1.23 MΩ
[a] The accuracy of the 600 Ω, 6 kΩ, and 60 kΩ range is specified using a 2-wire compensation configuration and after the Null function is
used to subtract the test lead resistance and thermal effect (by shorting the test leads).
22 U1450 Series/U1461A Service Guide
Page 23
Calibration Procedures 1
Tab le 1-2 Performance verification tests (U1452A/U1452AT/U1451A) (continued)
Step Test function Range
5
Earth-Bond
Resistance
rotary switch to the
position.
6
Frequency
Sensitivity
rotary switch is in the
position, press .
Step Test function Range M191 output
7
Insulation
Resistance
rotary switch to the
appropriate position.
Turn the
While the
Turn the
60 Ω 60 Ω ±0.93 Ω ±0.63 Ω
600 Ω 600 Ω ±9.3 Ω ±6.3 Ω
6 kΩ 6 kΩ ±0.093 kΩ ±0.063 kΩ
60 kΩ 60 kΩ ±0.93 kΩ ±0.63 kΩ
199.9 Hz 199.9 Hz, 1 V ±0.5 Hz ±0.5 Hz
50 V, 6 MΩ 6 MΩ - ±0.125 MΩ ±0.125 MΩ
50 V, 60 MΩ 60 MΩ - ±1.26 MΩ ±1.26 MΩ
50 V, 600 MΩ 600 MΩ - ±19.1 MΩ ±19.1 MΩ
50 V, 6 GΩ 6 GΩ - ±0.839 GΩ ±0.839 GΩ
5520A/5522A
output
Error from nominal 1 year
U1451A U1452AT/U1452A
Error from nominal 1 year
U1451A U1452AT U1452A
50 V, 60 GΩ 30 GΩ - ±18.62 GΩ ±18.62 GΩ
100 V, 6 MΩ 6 MΩ - ±0.125 MΩ ±0.125 MΩ
100 V, 60 MΩ 60 MΩ - ±1.25 MΩ ±1.25 MΩ
100 V, 600 MΩ 600 MΩ - ±15.5 MΩ ±15.5 MΩ
100 V, 6 GΩ 6 GΩ - ±0.479 GΩ ±0.479 GΩ
100 V, 60 GΩ 30 GΩ - ±9.62 GΩ ±9.62 GΩ
U1450 Series/U1461A Service Guide 23
Page 24
1 Calibration Procedures
Step Test function Range M191 output
7
Insulation
Resistance
rotary switch to the
appropriate position.
Turn the
250 V, 6 MΩ 6 MΩ ±0.095 MΩ - ±0.095 MΩ
250 V, 60 MΩ 60 MΩ ±0.95 MΩ - ±0.95 MΩ
250 V, 600 MΩ 600 MΩ ±10.3 MΩ -±10.3 MΩ
250 V, 6 GΩ 6 GΩ ±0.233 GΩ - ±0.233 GΩ
250 V, 30 GΩ 30 GΩ ±4.07 GΩ --
250 V, 60 GΩ 60 GΩ - - ±15.29 GΩ
250 V, 100 GΩ 100 GΩ - - ±41.9 GΩ
500 V, 6 MΩ 6 MΩ ±0.095 MΩ - ±0.095 MΩ
500 V, 60 MΩ 60 MΩ ±0.95 MΩ - ±0.95 MΩ
500 V, 600 MΩ 600 MΩ ±9.6 MΩ - ±9.6 MΩ
500 V, 6 GΩ 6 GΩ ±0.161 GΩ - ±0.161 GΩ
500 V, 30 GΩ 30 GΩ ±2.27 GΩ --
500 V, 60 GΩ 60 GΩ - - ±8.09 GΩ
500 V, 100 GΩ
1000 V, 6 MΩ 6 MΩ ±0.095 MΩ - ±0.095 MΩ
100 GΩ - - ±21.9 GΩ
Error from nominal 1 year
U1451A U1452AT U1452A
1000 V, 60 MΩ 60 MΩ ±0.95 MΩ - ±0.95 MΩ
1000 V,
600 MΩ
1000 V, 6 GΩ 6 GΩ ±0.125 GΩ - ±0.125 GΩ
1000 V, 30 GΩ 30 GΩ ±1.39 GΩ --
1000 V, 60 GΩ 60 GΩ - - ±4.49 GΩ
1000 V, 200 GΩ 100 GΩ - - ±11.9 GΩ
600 MΩ ±9.5 MΩ - ±9.5 MΩ
24 U1450 Series/U1461A Service Guide
Page 25
Calibration Procedures 1
Performance verification tests for U1461A/U1453A
Tab le 1-3 Performance verification tests for models U1461A/U1453A
Step Test function Range
1
DCA Turn the rotary
switch to the position.
2
ACA Turn the rotary
switch to the position.
6 μA6 μA - ±0.049 μA
60 μA 60 μA - ±0.25 μA
600 μA 600 μA - ±1.3 μA
6 mA 6 mA - ±0.013 mA
60 mA 60 mA - ±0.13 mA
440 mA 220 mA - ±0.5 mA
6 μA
60 μA
600 μA
6 mA
60 mA
5520A/5522A
output
235.2 mV, 45 Hz
235.2 mV, 1 kHz
60 μA, 45 Hz
60 μA, 1 kHz ±0.92 μA
600 μA, 45 Hz
600 μA, 1 kHz ±6.2 μA
6 mA, 45 Hz
6 mA, 1 kHz ±0.062 mA
60 mA, 45 Hz
60 mA, 1 kHz ±0.62 mA
[a]
[a]
Error from nominal 1 year
U1453A U1461A
-
-
-
-
-
-
±0.122 μA
±0.122 μA
±0.92 μA
±6.2 μA
±0.062 mA
±0.62 mA
[a]
[a]
220 mA
[a] The Fluke 5520A/5522A is unable to support the testing of the 6 μA range; therefore an alternative test is used, in which the Cal factor for
the 6 μA is 235.2 mV and it is used as an output from the Fluke 5520A/5522A.
220 mA, 45 Hz
-
220 mA, 1 kHz ±4.6 mA
±4.6 mA
U1450 Series/U1461A Service Guide 25
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1 Calibration Procedures
Tab le 1-3 Performance verification tests for models U1461A/U1453A (continued)
Step Test function Range
3
DCV Turn the rotary
switch to the position.
4
DCmV Turn the rotary
switch to the position.
[a] The accuracy is specified after the Null function is used to subtract the test lead resistance and thermal effect (by shorting the test leads).
5
ACV Turn the rotary switch
to the position.
6 V 6 V ±0.006 V ±0.006 V
60 V 60 V ±0.06 V ±0.06 V
600 V 600 V ±0.6 V ±0.6 V
1000 V 1000 V ±2 V ±2 V
60 mV
600 mV
6 V 6 V, 65 Hz ±0.063 V ±0.063 V
60 V 60 V, 65 Hz ±0.63 V ±0.63 V
600 V 600 V, 65 Hz ±6.3 V ±6.3 V
5520A/5522A
output
[a]
60 mV
[a]
600 mV
6 V, 5 kHz ±0.093 V ±0.093 V
6 V, 20 kHz ±0.124 V ±0.124 V
60 V, 5 kHz ±0.93 V ±0.93 V
60 V, 20 kHz ±1.24 V ±1.24 V
600 V, 999 Hz ±9.3 V ±9.3 V
Error from nominal 1 year
U1453A U1461A
- ±0.064 mV
- ±0.64 mV
1000 V 1000 V, 65 Hz ±13 V ±13 V
1000 V, 999 Hz ±18 V ±18 V
6
ACV (LPF) While the
rotary switch is in the
position, press once.
6 V 6 V, 439 Hz - ±0.363 V
60 V 60 V, 439 Hz - ±3.63 V
600 V 600 V, 439 Hz - ±36.3 V
1000 V 1000 V, 439 Hz - ±63 V
26 U1450 Series/U1461A Service Guide
Page 27
Calibration Procedures 1
Tab le 1-3 Performance verification tests for models U1461A/U1453A (continued)
Step Test function Range
7
ACmV Turn the rotary
switch to the position.
8
Resistance Turn the
rotary switch to the
position.
[b] The accuracy of the 600 Ω, 6 kΩ, and 60 kΩ range is specified using a 2-wire compensation configuration and after the Null function is
used to subtract the test lead resistance and thermal effect (by shorting the test leads).
9
Capacitance While the
rotary switch is in the
position, press thrice.
60 mV 60 mV, 65 Hz - ±0.63 mV
600 mV 600 mV, 65 Hz - ±6.3 mV
[b]
600 Ω
[b]
6 kΩ
[b]
60 kΩ
600 kΩ 600000 Ω ±3.2 kΩ ±3.2 kΩ
6 MΩ 6000000 Ω ±0.050 MΩ ±0.050 MΩ
60 MΩ 60000000 Ω ±0.93 MΩ ±0.93 MΩ
10 nF 10 nF ±0.12 nF ±0.12 nF
100 nF 100 nF ±1.2 nF ±1.2 nF
1 μF1 μF ±0.012 μF ±0.012 μF
5520A/5522A
output
60 mV, 5 kHz - ±0.93 mV
60 mV, 20 kHz - ±1.24 mV
600 mV, 5 kHz - ±9.3 mV
600 mV, 20 kHz - ±12.4 mV
600 Ω ±3.2 Ω ±3.2 Ω
6000 Ω ±0.032 kΩ ±0.032 kΩ
60000 Ω ±0.32 kΩ ±0.32 kΩ
Error from nominal 1 year
U1453A U1461A
10 μF10 μF ±0.12 μF ±0.12 μF
100 μF100 μF ±1.2 μF ±1.2 μF
1 mF 1 mF ±0.012 mF ±0.012 mF
10 mF 10 mF ±0.12 mF ±0.12 mF
10
Diode While the rotary
switch is in the position,
press twice.
1 V 0.85 V ±0.020 V ±0.020 V
U1450 Series/U1461A Service Guide 27
Page 28
1 Calibration Procedures
Tab le 1-3 Performance verification tests for models U1461A/U1453A (continued)
Step Test function Range
11
Earth-Bond
Resistance
rotary switch to the
position.
[a] The accuracy of the 6 Ω range is specified using a 5.0 Ω resistor for measurement.
[b] The accuracy of the 6 Ω to 600 Ω range is specified after the Null function is used to subtract the test lead resistance and thermal effect (by
shorting the test leads).
12
Frequency
Sensitivity
rotary switch is in the
position, press .
13
Temperature While the
rotary switch is in the
position, press thrice.
Turn the
While the
–200 °C to 1372 °C 0 °C - ± (Probe accuracy +
[b]
6 Ω
[b]
60 Ω
[b]
600 Ω
6 kΩ 6 kΩ ±0.032 kΩ ±0.032 kΩ
60 kΩ 60 kΩ ±0.32 kΩ ±0.32 kΩ
99.99 Hz 99.99 Hz, 1 V ±0.03 Hz ±0.03 Hz
5520A/5522A
output
5.0 Ω
60 Ω ±0.32 Ω ±0.32 Ω
600 Ω ±3.2 Ω ±3.2 Ω
Error from nominal 1 year
U1453A U1461A
±0.045 Ω
[a]
±0.045 Ω
1 °C)
[a]
Step Test function Range M191 output
14
Insulation
Resistance
rotary switch to the
appropriate position.
Turn the
50 V, 6 MΩ 6 MΩ ±0.095 MΩ ±0.095 MΩ
50 V, 60 MΩ 60 MΩ ±0.96 MΩ ±0.96 MΩ
50 V, 600 MΩ 600 MΩ ±0.13 MΩ ±0.13 MΩ
50 V, 6 GΩ 6 GΩ ±0.452 GΩ ±0.452 GΩ
50 V, 60 GΩ 30 GΩ ±9.49 GΩ ±9.49 GΩ
Error from nominal 1 year
U1453A U1461A
28 U1450 Series/U1461A Service Guide
Page 29
Calibration Procedures 1
Step Test function Range M191 output
14
Insulation
Resistance
rotary switch to the
appropriate position.
Turn the
100 V, 6 MΩ 6 MΩ ±0.095 MΩ ±0.095 MΩ
100 V, 60 MΩ 60 MΩ ±0.95 MΩ ±0.95 MΩ
100 V, 600 MΩ 600 MΩ ±12.8 MΩ ±12.8 MΩ
100 V, 6 GΩ 6 GΩ ±0.272 GΩ ±0.272 GΩ
100 V, 60 GΩ 30 GΩ ±4.99 GΩ ±4.99 GΩ
250 V, 6 MΩ 6 MΩ ±0.095 MΩ ±0.095 MΩ
250 V, 60 MΩ 60 MΩ ±0.95 MΩ ±0.95 MΩ
250 V, 600 MΩ 600 MΩ ±9.9 MΩ ±9.9 MΩ
250 V, 6 GΩ 6 GΩ ±0.164 GΩ ±0.164 GΩ
250 V, 60 GΩ 60 GΩ ±8.12 GΩ ±8.12 GΩ
250 V, 200 GΩ 100 GΩ ±22 GΩ ±22 GΩ
500 V, 6 MΩ 6 MΩ ±0.077 MΩ ±0.077 MΩ
500 V, 60 MΩ
500 V, 600 MΩ 600 MΩ ±7.8 MΩ ±7.8 MΩ
500 V, 6 GΩ 6 GΩ ±0.110 GΩ ±0.110 GΩ
60 MΩ ±0.77 MΩ ±0.77 MΩ
Error from nominal 1 year
U1453A U1461A
500 V, 60 GΩ 60 GΩ ±4.34 GΩ ±4.34 GΩ
500 V, 200 GΩ 100 GΩ ±11.7 GΩ ±11.7 GΩ
1000 V, 6 MΩ 6 MΩ ±0.077 MΩ ±0.077 MΩ
1000 V, 60 MΩ 60 MΩ ±0.77 MΩ ±0.77 MΩ
1000 V, 600 MΩ 600 MΩ ±7.7 MΩ ±7.7 MΩ
1000 V, 6 GΩ 6 GΩ ±0.092 GΩ ±0.092 GΩ
1000 V, 60 GΩ 60 GΩ ±2.54 GΩ ±2.54 GΩ
1000 V, 200 GΩ 100 GΩ ±6.7 GΩ ±6.7 GΩ
U1450 Series/U1461A Service Guide 29
Page 30
1 Calibration Procedures
Resistor
5 Ω
Figure 1-1 Connecting the U1450 Series/U1461A to the M191
Figure 1-2 Connecting the U1450 Series/U1461A for 6 Ω EBR
measurement
30 U1450 Series/U1461A Service Guide
Page 31
Calibration Security
NOTE
The calibration security code prevents 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 32).
The security code can only be changed after the instrument has been unsecured.
You can unsecure the instrument from its front panel.
The security code is set to “1234” when the instrument is shipped from the
factory. The security code is stored in nonvolatile memory and does not change
when power has been turned off.
The security code may contain up to four numeric characters.
Calibration Procedures 1
U1450 Series/U1461A Service Guide 31
Page 32
1 Calibration Procedures
NOTE
U1461A/U1453A
U1452A/U1452AT/U1451A
Unsecuring the Instrument for Calibration
Before you can adjust the instrument, you must unsecure it by entering the
correct security code.
The default security code is set to “1234”.
If you forget your security code, see “To reset the calibration security code to its
factory default” on page 33.
To unsecure the instrument from the front panel
1 Power-on the instrument, and press the and keys simultaneously
for more than 1 second.
The calibration security code entry is shown on the display.
32 U1450 Series/U1461A Service Guide
2 Key in the default security code if you are unsecuring your instrument for the
first time.
– Press or to move the cursor to the right or to the left.
– Press or to increment or decrement the digit.
3 Press when you are done.
If the correct security code is entered, PASS is shown briefly, after which the
instrument will enter the adjustment mode.
If an incorrect security code is entered, an error code will appear briefly, after
which the instrument will prompt you for the security code again.
Page 33
To change the calibration security code
U1461A/U1453A
U1452A/U1452AT/U1451A
1 After the instrument has been unsecured, press (for U1452A/
U1452AT/U1451A) or press (for U1461A/U1453A) for more than
1 second.
2 The factory default calibration security code “1234” is shown on the display if
you are changing the calibration security code for the first time.
3 Set your new calibration security code (0000 to 9999).
– Press or to move the cursor to the right or to the left.
Calibration Procedures 1
– Press or to increment or decrement the digit.
4 Press to save the new calibration security code.
5 Alternatively, press (for U1452A/U1452AT/U1451A) or press
(for U1461A/U1453A) for more than 1 second to cancel the changes made.
If the new calibration security code has been successfully stored, the display will
show PASS. Record down your new calibration security code, and store it in a safe
location.
To reset the calibration security code to its factory default
If you have forgotten the correct calibration security code, you may follow the
steps below to reset the calibration security code to the factory default code
(1234).
U1450 Series/U1461A Service Guide 33
Page 34
1 Calibration Procedures
NOTE
U1461A/U1453A
U1452A/U1452AT/U1451A
If you do not have a record (or have lost the record) of the security code, first try
the factory default code, “1234”.
1 Before you begin, note down the last four digits of the instrument’s serial
number (located at the bottom of the rear panel).
2 Power-on the instrument, and press and simultaneously for more
than 1 second.
The calibration security code entry is shown on the display.
34 U1450 Series/U1461A Service Guide
3 Press for more than 1 second.
4 Set the code to the same as the last four digits of the instrument’s serial
number.
– Press or to move the cursor to the right or to the left.
– Press or to increment or decrement the digit.
5 Press to confirm the entry.
If the four digits entered are correct, the display will show PASS. The calibration
security code is now set to its factory default code, “1234”.
If the incorrect security code is entered, an error code will appear briefly, after
which the instrument will prompt you for the security code again.
If you want to enter a new security code, see “To change the calibration security
code” on page 33. Ensure that you record down the new security code.
Page 35
Using the Front Panel for Adjustments
NOTE
This section describes the procedures to perform adjustments from the front
panel.
To unsecure the instrument, see “To unsecure the instrument from the front panel”
on page 32. Once unsecured, the reference value will be indicated on the display.
Adjustment considerations
1 Use the Fluke 5520A/5522A calibrator (or equivalent) for the adjustment
procedure.
2 Allow the instrument to warm up and stabilize for 1 hour before performing the
adjustments.
3 Ensure that during the adjustments, the low battery indicator does not appear.
If the low battery indicator appears, replace the batteries as soon as possible
to avoid false readings.
4 Consider the thermal effects as you are connecting the test leads to the
calibrator and tester. It is recommended to wait for 1 minute before you begin
the calibration after connecting the test leads.
5 Before proceeding with the ambient temperature adjustment, be sure to turn
on the tester for at least 1 hour with the K-type thermocouple connected.
6 When the word “SHORT” is used, connect the specified terminals with copper
wires on banana plugs as short as possible.
Calibration Procedures 1
7 When the word “OPEN” is used, remove all test leads from the instrument’s
terminals.
After each adjustment, the display shows PAS S. If the calibration fails, the
instrument sounds a beep, and an error number is shown on the display. Calibration
error messages are described in “Calibration Error Codes” on page 50.
U1450 Series/U1461A Service Guide 35
Page 36
1 Calibration Procedures
CAUTION
Never turn off the instrument during an adjustment. This may delete the
calibration memory for the present function.
Valid adjustment input values (U1452A/U1452AT/U1451A)
Adjustment can be accomplished using the following input values below.
Tab le 1-4 Adjustment input values (U1452A/U1452AT/U1451A)
Test function sequence Step Reference value Valid reference input
1. DCV Turn the rotary switch
to the position.
2. ACV Turn the rotary switch
to the position.
600 mV 0.00 mV Reference Zero Point
600 mV 300.00 mV 0.9 to 1.1 × Reference Value
6 V 3.0000 V 0.9 to 1.1 × Reference Value
60 V 30.000 V 0.9 to 1.1 × Reference Value
600 V 300.00 V 0.9 to 1.1 × Reference Value
SHORT SHORT mV SHORT VΩ/COM Terminals
030.0 mV (55 Hz) 0.9 to 1.1 × Reference Value
600 mV
300.0 mV (55 Hz) 0.9 to 1.1 × Reference Value
0.300 V (55 Hz) 0.9 to 1.1 × Reference Value
6 V
3.000 V (55 Hz) 0.9 to 1.1 × Reference Value
3.00 V (55 Hz) 0.9 to 1.1 × Reference Value
60 V
30.00 V (55 Hz) 0.9 to 1.1 × Reference Value
30.00 V (55 Hz) 0.9 to 1.1 × Reference Value
600 V
300.0 V (55 Hz) 0.9 to 1.1 × Reference Value
36 U1450 Series/U1461A Service Guide
Page 37
Calibration Procedures 1
Tab le 1-4 Adjustment input values (U1452A/U1452AT/U1451A) (continued)
Test function sequence Step Reference value Valid reference input
3. DCA at Ω
switch to the position.
4. ACA at Ω
switch to the position.
5. ZERO at Ω
rotary switch to the position.
6. IR 50 V
switch to the position.
EB
EB
[a]
[b]
Turn the rotary
Turn the rotary
Turn the rotary
Turn the
6.000 μA 0.000 μA-
6.000 μA 3.000 μA 0.9 to 1.1 × Reference Value
60 μA 30.00 μA 0.9 to 1.1 × Reference Value
600 μA 300.0 μA 0.9 to 1.1 × Reference Value
6.000 mA 3.000 mA 0.9 to 1.1 × Reference Value
60 mA 30.00mA 0.9 to 1.1 × Reference Value
600 mA 300.0 mA 0.9 to 1.1 × Reference Value
OPEN OPEN μA OPEN Terminals
30.00 μA (55 Hz) 0.9 to 1.1 × Reference Value
60 μA
60.00 μA (55 Hz) 0.9 to 1.1 × Reference Value
030.0 μA (55 Hz) 0.9 to 1.1 × Reference Value
600 μA
300.0 μA (55 Hz) 0.9 to 1.1 × Reference Value
0.300 mA (55 Hz) 0.9 to 1.1 × Reference Value
6.000 mA
2.000 mA (55 Hz) 0.9 to 1.1 × Reference Value
SHORT SHORT SHORT VΩ/COM Terminals
OPEN OPEN OPEN Terminals
[a] Zero calibration should be executed after the mV and µA/mA calibration are completed.
[b] The IR test voltage calibration should be executed after the voltage calibration is completed.
U1450 Series/U1461A Service Guide 37
Page 38
1 Calibration Procedures
Valid adjustment input values (U1453A)
Adjustment can be accomplished using the following input values.
Tab le 1-5 Adjustment input values (U1453A)
Test function sequence Step Reference value Valid reference input
1. DCV Turn the rotary switch
to the position.
600.00 mV 0.00 mV -
600.00 mV 300.00 mV 0.9 to 1.1 × Reference Value
6.0000 V 3.0000 V 0.9 to 1.1 × Reference Value
60.000 V 30.000 V 0.9 to 1.1 × Reference Value
600.00 V 300.00 V 0.9 to 1.1 × Reference Value
1000.0V 1000.0 V 0.9 to 1.1 × Reference Value
SHORT SHORT -
38 U1450 Series/U1461A Service Guide
Page 39
Calibration Procedures 1
Tab le 1-5 Adjustment input values (U1453A) (continued)
Test function sequence Step Reference value Valid reference input
2. ACV Turn the rotary switch
to the position.
300.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
300.00 mV (20 kHz) 0.9 to 1.1 × Reference Value
600.00 mV
030.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
300.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (5 kHz) 0.9 to 1.1 × Reference Value
6.0000 V
0.3000 V (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (5 kHz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
60.000 V
30.000 V (5 kHz) 0.9 to 1.1 × Reference Value
03.000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
030.00 V (55 Hz) 0.9 to 1.1 × Reference Value
600.00 V
300.00 V (55 Hz) 0.9 to 1.1 × Reference Value
0030.0 V (55 Hz) 0.8 to 1.2 × Reference Value
1000.0 V
0300.0 V (55 Hz) 0.9 to 1.1 × Reference Value
3. DCA at Ω
Turn the rotary
EB
switch to the position.
OPEN OPEN OPEN Terminals
Ω
6 μA 3.0000 μA
60 μA 30.000 μA
600 μA 300 μA
6 mA 3 mA
μA mA/COM Terminals
EB
μA mA/COM Terminals
Ω
EB
μA mA/COM Terminals
Ω
EB
μA mA/COM Terminals
Ω
EB
U1450 Series/U1461A Service Guide 39
Page 40
1 Calibration Procedures
Tab le 1-5 Adjustment input values (U1453A) (continued)
Test function sequence Step Reference value Valid reference input
6. Earth-Bond
Resistance
switch to the position.
[a]
Turn the rotary
8. Resistance Turn the rotary
switch to the position.
9. Diode While the rotary
switch is in the position, press
twice.
SHORT SHORT SHORT VΩ/COM Terminals
6 μA 3.0000 μA
60 μA 30.000 μA
300 μA 300 μA
60 mA 30.000 mA
6 Ω 0.000 Ω SHORT VΩ/COM Terminals
OPEN OPEN Terminals
60.000 MΩ
10.000 MΩ 0.9 to 1.1 × Reference Value
6.0000 MΩ 3.0000 MΩ 0.9 to 1.1 × Reference Value
600.00 kΩ 300.00 kΩ 0.9 to 1.1 × Reference Value
60.000 kΩ 30.000 kΩ 0.9 to 1.1 × Reference Value
6.0000 kΩ 3.0000 kΩ 0.9 to 1.1 × Reference Value
600.00 Ω 300.00 Ω 0.9 to 1.1 × Reference Value
60.000 Ω 30.000 Ω 0.9 to 1.1 × Reference Value
SHORT SHORT -
1 V 0.000 Ω SHORT V/COM Terminals
1.0000 V 1.0000 V 0.9 to 1.1 × Reference Value
SHORT SHORT
ΩEB μA mA/COM Terminals
ΩEB μA mA/COM Terminals
Ω
μA mA/COM Terminals
EB
ΩEB μA mA/COM Terminals
40 U1450 Series/U1461A Service Guide
Page 41
Calibration Procedures 1
Tab le 1-5 Adjustment input values (U1453A) (continued)
Test function sequence Step Reference value Valid reference input
10. Capacitance While the
rotary switch is in the
position, press thrice.
13. IR 50 V
switch to the position.
[b]
Turn the rotary
OPEN OPEN OPEN Terminals
3.000 nF 0.9 to 1.1 × Reference Value
10.000 nF
10.000 nF 0.9 to 1.1 × Reference Value
10.00 nF 0.9 to 1.1 × Reference Value
100.00 nF
100.00 nF 0.9 to 1.1 × Reference Value
0.1000 μF 0.9 to 1.1 × Reference Value
1.0000 μF
1.0000 μF 0.9 to 1.1 × Reference Value
1.000 μF 0.9 to 1.1 × Reference Value
10.000 μF
10.000 μF 0.9 to 1.1 × Reference Value
10.00 μF 0.9 to 1.1 × Reference Value
100.00 μF
100.00 μF 0.9 to 1.1 × Reference Value
0.1000 mF 0.9 to 1.1 × Reference Value
1.0000 mF
1.0000 mF 0.9 to 1.1 × Reference Value
1.000 mF 0.9 to 1.1 × Reference Value
10.000 mF
10.000 mF 0.9 to 1.1 × Reference Value
OPEN OPEN OPEN Terminals
[a] Zero calibration should be executed after the mV and µA/mA calibration at the ΩEB position are completed.
[b] The IR test voltage calibration should be executed after the DCV calibrations are completed.
U1450 Series/U1461A Service Guide 41
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1 Calibration Procedures
Valid adjustment input values (U1461A)
Adjustment can be accomplished using the following input values.
Tab le 1-6 Adjustment input values (U1461A)
Test function sequence Step Reference value Valid reference input
1. DCA Turn the rotary switch
to the position.
2. DCmV Turn the rotary
switch to the position.
3. ACmV Turn the rotary switch
to the position.
4. DCV Turn the rotary switch
to the position.
OPEN OPEN OPEN Terminals
6.0000 μA 3.0000 μA 0.9 to 1.1 × Reference Value
60.000 μA 30.000 μA 0.9 to 1.1 × Reference Value
600.00 μA 300.00 μA 0.9 to 1.1 × Reference Value
6.0000 mA 3.0000 mA 0.9 to 1.1 × Reference Value
60.000 mA 30.000mA 0.9 to 1.1 × Reference Value
600.00 mA 300.00 mA 0.9 to 1.1 × Reference Value
60 mA 0.000 mV SHORT VΩ/COM Terminals
60.000 mV 30.000 mV 0.9 to 1.1 × Reference Value
600.00 mV 300.00 mV 0.9 to 1.1 × Reference Value
SHORT SHORT -
03.000 mV (55 Hz) 0.9 to 1.1 × Reference Value
60.000 mV
30.000 mV (55 Hz) 0.9 to 1.1 × Reference Value
030.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
600.00 mV
300.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
600 mV 0.00 mV -
600.00 mV 300.00 mV 0.9 to 1.1 × Reference Value
6.0000 V 3.0000 V 0.9 to 1.1 × Reference Value
60.000 V 30.000 V 0.9 to 1.1 × Reference Value
600.00 V 300.00 V 0.9 to 1.1 × Reference Value
1000.0V 1000.0 V 0.9 to 1.1 × Reference Value
SHORT SHORT -
42 U1450 Series/U1461A Service Guide
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Calibration Procedures 1
Tab le 1-6 Adjustment input values (U1461A) (continued)
Test function sequence Step Reference value Valid reference input
5. ACV Turn the rotary switch
to the position.
6. EBR at W
rotary switch to the position.
EB
[a]
Turn the
300.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
300.00 mV (20 kHz) 0.9 to 1.1 × Reference Value
600.00 mV
030.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
300.00 mV (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (5 kHz) 0.9 to 1.1 × Reference Value
6.0000 V
0.3000 V (55 Hz) 0.9 to 1.1 × Reference Value
3.0000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (5 kHz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
60.000 V
30.000 V (5 kHz) 0.9 to 1.1 × Reference Value
03.000 V (55 Hz) 0.9 to 1.1 × Reference Value
30.000 V (55 Hz) 0.9 to 1.1 × Reference Value
030.00 V (55 Hz) 0.9 to 1.1 × Reference Value
600.00 V
300.00 V (55 Hz) 0.9 to 1.1 × Reference Value
0030.0 V (55 Hz) 0.8 to 1.2 × Reference Value
1000.0 V
0300.0 V (55 Hz) 0.9 to 1.1 × Reference Value
SHORT SHORT -
6 μA 3.0000 μA
Ω
μA mA/COM Terminals
EB
μA mA/COM Terminals
60 μA 30.000 μA
600 μA 300.00 μA
60 mA 30.000 mA
Ω
EB
μA mA/COM Terminals
Ω
EB
μA mA/COM Terminals
Ω
EB
U1450 Series/U1461A Service Guide 43
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1 Calibration Procedures
Tab le 1-6 Adjustment input values (U1461A) (continued)
Test function sequence Step Reference value Valid reference input
7. ACA Turn the rotary switch
to the position.
6.0000 μA
60.000 μA
0.3000 μA (55 Hz)
3.0000 μA (55 Hz) 0.9 to 1.1 × Reference Value
03.000 μA (55 Hz) 0.8 to 1.2 × Reference Value
30.000 μA (55 Hz)
[b]
[b]
0.8 to 1.2 × Reference Value
0.9 to 1.1 × Reference Value
8. Resistance Turn the rotary
switch to the position.
600.00 μA
030.00 μA (55 Hz) 0.9 to 1.1 × Reference Value
300.00 μA (55 Hz) 0.9 to 1.1 × Reference Value
0.3000 mA (55 Hz) 0.9 to 1.1 × Reference Value
6.0000 mA
3.0000 mA (55 Hz) 0.9 to 1.1 × Reference Value
03.000 mA (55 Hz) 0.9 to 1.1 × Reference Value
60.000 mA
30.000 mA (55 Hz) 0.9 to 1.1 × Reference Value
030.00 mA (55 Hz) 0.9 to 1.1 × Reference Value
600.00 mA
300.00 mA (55 Hz) 0.9 to 1.1 × Reference Value
60 Ω 0.000 Ω -
OPEN OPEN Terminals
60.000 MΩ
10.000 MΩ 0.9 to 1.1 × Reference Value
6.0000 MΩ 3.0000 MΩ 0.9 to 1.1 × Reference Value
600.00 kΩ 300.00 kΩ 0.9 to 1.1 × Reference Value
60.000 kΩ 30.000 kΩ 0.9 to 1.1 × Reference Value
6.0000 kΩ 3.0000 kΩ 0.9 to 1.1 × Reference Value
600.00 Ω 300.00 Ω 0.9 to 1.1 × Reference Value
60.000 Ω 30.000 Ω 0.9 to 1.1 × Reference Value
SHORT SHORT -
9. Diode While the rotary
switch is in the position, press
twice.
1 V 0 Ω -
1.0000 V 1.0000 V 0.9 to 1.1 × Reference Value
SHORT SHORT -
44 U1450 Series/U1461A Service Guide
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Calibration Procedures 1
Tab le 1-6 Adjustment input values (U1461A) (continued)
Test function sequence Step Reference value Valid reference input
10. Capacitance While the
rotary switch is in the
position, press thrice.
11. Temperature While the
rotary switch is in the position,
press thrice.
12. Vsense
switch is in any position, press and
hold .
13. IR 50 V
switch to the position.
[c]
While the rotary
[d]
Turn the rotary
OPEN OPEN OPEN Terminals
10.000 nF
100.00 nF
1.0000 μF
10.000 μF
100.00 μF
1.0000 mF
10.000 mF
K type 000.0 °C
Hi.10 V 10 V (55 Hz) High Sense
Lo.30 V 30 V (55 Hz) Low Sense
OPEN OPEN OPEN Terminals
3.000 nF 0.9 to 1.1 × Reference Value
10.000 nF 0.9 to 1.1 × Reference Value
10.00 nF 0.9 to 1.1 × Reference Value
100.00 nF 0.9 to 1.1 × Reference Value
0.1000 μF 0.9 to 1.1 × Reference Value
1.0000 μF 0.9 to 1.1 × Reference Value
1.000 μF 0.9 to 1.1 × Reference Value
10.000 μF 0.9 to 1.1 × Reference Value
10.00 μF 0.9 to 1.1 × Reference Value
100.00 μF 0.9 to 1.1 × Reference Value
0.1000 mF 0.9 to 1.1 × Reference Value
1.0000 mF 0.9 to 1.1 × Reference Value
1.000 mF 0.9 to 1.1 × Reference Value
10.000 mF 0.9 to 1.1 × Reference Value
0 °C with Ambient Compensation
Required
[a] Zero calibration should be executed after the mV and µA/mA calibration at the ΩEB position are completed.
[b] The minimum AC current output of the Fluke 5520A/5522A calibrator is 29.00 μA only. Be sure to set at least 30.00 μA for the calibration
source of the ACμA.
[c] Vsense function for model U1461A only.
[d] The IR test voltage calibration should be executed after the DCV calibrations are completed.
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1 Calibration Procedures
NOTE
NOTE
NOTE
Adjustment procedure
Review the Test Considerations and Adjustment considerations before beginning
the adjustment procedures.
1 Turn the rotary switch to the respective test function position as shown in the
adjustment input values table (Table 1-6 ).
2 Unsecure the instrument to enter the adjustment mode. (See “Unsecuring the
Instrument for Calibration” on page 32).
While in the adjustment mode, press and simultaneously to exit the
adjustment mode.
3 The reference value of the calibration item will be shown on the display.
4 Configure each calibration item.
5 Use the arrow keys to select the calibration range.
6 Apply the input signal shown in the Reference value column of Table 1-6 . The
analog bar graph displays the input reading. There is no bar graph display for
temperature adjustment.
You are highly recommended to complete the adjustments in the same order as
shown in Table 1-6.
7 Use the arrow keys to enter the actual applied input values.
8 Press to start the adjustment. CAL is shown on the display to indicate
that the calibration is in progress.
46 U1450 Series/U1461A Service Guide
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9 Upon completion of each adjustment value, the display will show PASS. If the
NOTE
adjustment fails, the instrument will sound a long beep and the calibration
error number is shown on the display.
If the adjustment fails, check the input value, range, function, and entered
adjustment value before repeating the adjustment steps. Refer to “Calibration
Error Codes” on page 50 for more information where necessary.
10 Turn the rotary switch to the next function according to the Test function
sequence column shown in Table 1-6 . Repeat step 3 to step 8 for each
adjustment point shown in the adjustment table.
11 Verify the adjustments using the “Performance Verification Tests” on page 21.
Non-Contact Voltage (NCV) Calibration
– Ensure that the tester is REMOVED from the holster prior to performing this
calibration.
– Keep the tester away from electrical noise sources during the tests, i.e.,
fluorescent lights, dimmable lights, motors, etc. These sources can invalidate
the calibration.
– It may be necessary in step 4 and step 8 below to slightly adjust the tester’s
position for maximum signal strength.
Calibration Procedures 1
Refer the following procedure to calibrate the NCV function properly:
1 Turn the rotary switch to the position. Hi.10 V is shown on the display.
2 Connect a double banana plug (open type) into the output voltage terminals of
the calibrator.
3 Ensure that the EARTH button of calibrator is turned ON.
4 Put the tester and ensure the tester’s top is vertically and horizontally centered
to contact the banana plug’s Hi terminal.
5 Set the source output to 10 V/55 Hz.
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1 Calibration Procedures
6 Press to start the calibration. If the tester passes the calibration then the
display will indicate Lo.30 V.
7 Set the source to output to 30 V/55Hz.
8 Press to start the calibration.
9 When the calibration has been done, set the calibrator to the standby mode.
Exiting the adjustment mode
1 Remove all the shorting plugs and connectors from the instrument.
2 Record the new Calibration Count.
3 Press and simultaneously to exit the Adjustment Mode.
4 Cycle the instrument’s power. The instrument will then be secured.
48 U1450 Series/U1461A Service Guide
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Calibration Count
NOTE
U1461A/U1453A
U1452A/U1452AT/U1451A
Press
Press
You can query the instrument to determine how many adjustments have been
performed.
The instrument has been calibrated before it left the factory. You are
recommended to record the initial value of the calibration count once you receive
the instrument.
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 instrument has
been unsecured.
1 In adjustment mode, press to view the calibration count.
Calibration Procedures 1
U1450 Series/U1461A Service Guide 49
2 Take note of the calibration count to keep track of the number of calibrations
that have been performed.
3 Press again to exit the calibration count mode.
Page 50
1 Calibration Procedures
Calibration Error Codes
The following errors indicate failures that may occur during a calibration.
Tab le 1-7 Calibration error codes
Code Descriptions
200/ER200 Calibration error: calibration mode is secured
002/ER002 Calibration error: secure code invalid
003/ER003 Calibration error: serial number code invalid
004/ER004 Calibration error: calibration aborted
005/ER005 Calibration error: value out of range
006/ER006 Calibration error: signal measurement out of range
007/ER007 Calibration error: frequency out of range
008/ER008 EEPROM write failure
50 U1450 Series/U1461A Service Guide
Page 51
U1461A Insulation Multimeter/U1453A Insulation Tester
Service Guide
2 Service and Maintenance
Troubleshooting 52
Fuse Replacement 53
Returning the Instrument for Service 55
Replaceable Parts 56
Types of Service Available 57
Obtaining Repair Service (Worldwide) 58
This chapter will help you troubleshoot a failing instrument. It also describes how
to obtain repair services and lists the replaceable assemblies.
51
Page 52
2 Service and Maintenance
WARNING
CAUTION
Troubleshooting
To avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
Any repair or service which is not covered in this manual should only be
performed by qualified personnel.
If the instrument fails to operate, check the batteries and the test leads. Replace
them if necessary. If the instrument still does not function, check the operating
procedures in this manual. When servicing, use only the specified replacement
parts.
The table below will assist you in identifying some basic malfunctions.
Tab le 2-1 Operating checklist
Malfunction Identification
No display when powered ON using
the rotary switch
No beeper tone – Verify that the beeper is enabled in the Setup mode.
Failed on current measurement
(U1461A only)
Failed on remote control
– Verify the batteries health and replace batteries as necessary.
– Verify the fuses health and replace the fuses as necessary.
– Verify the optical side of the IR-USB cable connected to the tester — the Keysight
logo should be facing up.
– Verify the baud rate, data bit, and parity settings in the tester’s setup mode.
(Default values are 9600, 8, and none.)
– Verify that the driver for the IR-USB interface is installed on the PC.
52 U1450 Series/U1461A Service Guide
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Fuse Replacement
NOTE
CAUTION
No recalibration is required after replacing the fuse.
The current input and earth-bond resistance terminals of your tester are fuse
protected. The fuses are located next to the battery compartment.
The terminals are protected by a 10 × 35 mm 440 mA/1000 V 30 kA fast-acting
fuse.
Before you proceed with the fuse replacement, remove all cable connections
to the terminals and ensure that the rotary switch is at the OFF position.
If you are certain that a fuse is faulty, replace it with one of the same size and
rating.
Service and Maintenance 2
1 Remove the orange rubber holster. Pull from a top
corner and stretch the orange rubber holster off
the tester.
2 Loosen and remove the two screws with a suitable
Phillips screwdriver as shown on the right.
3 Lift and remove the fuse cover as shown on the
left.
U1450 Series/U1461A Service Guide 53
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2 Service and Maintenance
4 Lift the inner rubber cover to access the fuse
compartment.
5 Locate the faulty fuse. Gently remove the
defective fuse by prying one end of the fuse with a
flathead screwdriver and removing it out of the
fuse bracket. Replace a new fuse of the same size
and rating into the center of the fuse holder.
6 Ensure that the inner rubber cover is positioned
properly.
7 Replace the fuse cover back in its original position
and tighten the screws.
8 Finally fit the orange rubber holster back on the
tester.
54 U1450 Series/U1461A Service Guide
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Returning the Instrument for Service
NOTE
Before shipping your instrument for repair or replacement, Keysight recommends
that you acquire the shipping instructions from the Keysight Service Center. A
clear understanding of the shipping instructions is necessary to secure your
product for shipment.
1 Attach a tag to the instrument with the following information:
– 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 Place the instrument in its original container with appropriate packaging
material for shipping.
If the original shipping container is not available, place your unit in a container
which will ensure at least 4 inches of compressible packaging material around all
sides for the instrument. Use static-free packaging materials to avoid additional
damage to your unit.
Service and Maintenance 2
Keysight suggests that you always insure your shipments.
U1450 Series/U1461A Service Guide 55
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2 Service and Maintenance
Replaceable Parts
This section contains information for ordering replacement parts for your
instrument. You can find the instrument support parts list at Keysight's Test &
Measurement Parts Catalog: http://www.keysight.com/find/parts
The parts lists include a brief description of each part with its corresponding
Keysight part number.
To order replaceable parts
You can order replaceable parts from Keysight using the Keysight part number.
Note that not all parts listed are available as field-replaceable parts.
To order replaceable parts from Keysight, do the following:
1 Contact your nearest Keysight Sales Office or Service Center.
2 Identify the parts by the Keysight part number shown in the support parts list.
3 Provide the instrument model number and serial number.
56 U1450 Series/U1461A Service Guide
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Types of Service Available
If your instrument fails during the warranty period, Keysight will repair or replace it
under the terms of your warranty. After your warranty expires, Keysight offers
repair services at competitive prices.
Extended service contracts
Many Keysight products are available with optional service contracts that extend
the covered period after the standard warranty expires. If you have such a service
contract and your instrument fails during the covered period, Keysight will repair
or replace it in accordance with the contract.
Service and Maintenance 2
U1450 Series/U1461A Service Guide 57
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2 Service and Maintenance
Obtaining Repair Service (Worldwide)
To obtain service for your instrument (in-warranty, under service contract, or
post-warranty), contact your nearest Keysight Service Center. They will arrange to
have your unit repaired or replaced, and can provide warranty or repair-cost
information where applicable.
To obtain warranty, service, or technical support information you can contact
Keysight at one of the following telephone numbers:
– In the United States: (800) 829-4444
– In Europe: 31 20 547 2111
– In Japan: 0120-421-345
Or use our Web link for information on contacting Keysight worldwide:
www.keysight.com/find/assist
Or contact your Keysight representative.
Before shipping your instrument, request the Keysight Service Center to provide
shipping instructions, including what components to ship. Keysight recommends
that you retain the original shipping carton for use in such shipments.
58 U1450 Series/U1461A Service Guide
Page 59
This information is subject to change
without notice. Always refer to the
Keysight website for the latest
revision.
© Keysight Technologies 2015-2017
Edition 5, June 30, 2017
Printed in Malaysia
*U1451-90014*
U1451-90014
www.keysight.com
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