Keysight U1452A, U1452AT, U1451A User Manual

Keysight U1452A/U1452AT/
U1451A Insulation Tester

Distributed by:

User’s Guide

dataTec ▪ Ferdinand-Lassalle-Str. 52 ▪ 72770 Reutlingen ▪ Tel. 07121 / 51 50 50 ▪ Fax 07121 / 51 50 10 ▪ [e-mail] ▪ www.datatec.de

U1452A/U1452AT/U1451A User’s Guide I

Notices

CAUTION

WARNING

© Keysight Technologies 2014

No p art o f this manu al may be re produce d 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

U1451-90003

Edition

Edition 3, December 5, 2014

Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403

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.

Technology Licenses

The hardware 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.

Restricted Rights Legend

U.S. Government Restricted Rights. Soft­ware and technical data rights granted to
the federal government include only those
rights customarily provided to end user cus­tomers. Keysight provides this customary
commercial license in Software and techni­cal data pursuant to FAR 12.211 (Technical
Data) and 12.212 (Computer Software) and,
for the Department of Defense, DFARS

252.227-7015 (Technical Data - Commercial
Items) and DFARS 227.7202-3 (Rights in
Commercial Computer Software or Com­puter Software Documentation).

Safety Notices

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.

II U1452A/U1452AT/U1451A User’s Guide

Safety Symbols

CAT III
1000 V

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

Caution, risk of danger (refer to

Alternating current (AC)

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

U1452A/U1452AT/U1451A User’s Guide III

Safety Considerations

WARNING

Read the information below before using this tester. Model U1452A appears in all
illustrations.

• 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
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.

• Ensure that you do not perform insulation resistance tests in distribution 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.

DC, 30 VAC RMS, or 42.4 V peak. Such

IV U1452A/U1452AT/U1451A User’s Guide

CAUTION

• Disconnect circuit power and discharge all high-voltage capacitors before testing

resistance, continuity, 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 with 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.

• 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.

U1452A/U1452AT/U1451A User’s Guide V

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 condition Requirement

Te m p e r a t u r e

• Operating condition

• –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)

Humidity

Altitude Up to 2,000 meters

Pollution degree Pollution degree II

The U1452A/U1452AT/U1451A 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

Full accuracy up to 80% RH for temperatures up to 30 °C,
decreasing linearly to 50% RH at 55 °C

VI U1452A/U1452AT/U1451A User’s Guide

Regulatory Markings

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

The C-tick 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.

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

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

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.

U1452A/U1452AT/U1451A User’s Guide VII

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

www.keysight.com/environment/product

for more information.

VIII U1452A/U1452AT/U1451A User’s Guide

Declaration of Conformity (DoC)

NOTE

The Declaration of Conformity (DoC) for this instrument is available on the Keysight
website. You can search the DoC by its product model or description at:

http://regulations.products.keysight.com/DoC/search.htm

If you are unable to search for the respective DoC, please contact your
local Keysight representative.

U1452A/U1452AT/U1451A User’s Guide IX

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

X U1452A/U1452AT/U1451A User’s Guide

Table of Contents

1 Introduction

About This Manual 2

Documentation map 2
Safety notes 2

Preparing Your Tester 3

Check the shipment 3
Install or change the batteries 3
Turn on your tester 6
Select the range 6
Adjust the tilt stand 7
Connect to the Handheld Meter Logger Software 8
Connect the Bluetooth adapter 9

Your Tester in Brief 10

Dimensions 10
Overview 12
Rotary switch 14
Keypad 16
Display screen 20
Input terminals 24

Cleaning Your Tester 25

Additional Features 26

Automatic power-off 26
Hazardous voltage indication 26
Power-on options 26

2 Making Measurements

Insulation Resistance Test 30

Using the Remote Switch Probe 32

U1452A/U1452AT/U1451A User’s Guide XI

Locking the test 33
Timed insulation resistance/earth-bond resistance test 34
Measuring the Dielectric Absorption Ratio (DAR) 35
Measuring the Polarization Index (PI) 36
Viewing the leakage current 37

Earth-Bond Resistance Test 38

Measuring AC or DC Voltage 41

Auto AC or DC signal identification 43

Measuring Frequency 44

Measuring Resistance 46

Continuity Test 48

Measuring Capacitance 50

3 Tester Features

Making Relative Measurements (Null) 54

Freezing the Display (TrigHold and AutoHold) 55

Performing Limit Comparisons (Limit) 57

Recording Measurement Data (Log) 59

Performing manual logs (HAND) 60
Performing interval logs (AUTO) 60
Performing event logs (TRIG) 61

Reviewing Previously Recorded Data (View) 63

4 Setup Options

Using the Setup Menu 66

Editing numerical values 67

Setup Menu Summary 68

Setup Menu Items 71

XII U1452A/U1452AT/U1451A User’s Guide

Changing the variation count 71
Enabling smooth mode 71
Changing the beep frequency 72
Changing the auto power-off (APO) timer 73
Changing the LCD backlight timeout 73
Changing the continuity alert 74
Disabling the power-on melody 75
Changing the battery type 75
Resetting the tester’s Setup options 76
Changing the display count 76
Changing the cable length unit 77
Changing the cable length scale 78
Changing the alert indicators 78
Changing the sample interval duration 79
Changing the recording option 80
Changing the IR and EBR test period 80
Changing the maximum inhibit voltage for IR tests 81
Disabling the lock once feature 82
Changing the button operation on the remote switch probe 82
Changing the Dielectric Absorption Ratio (DAR) for IR

tests 83

5 Characteristics and Specifications

Product Characteristics 86

Specification Considerations 88

Measurement Category 88

Electrical Specifications 89

DC specifications 89
AC specifications 91
Capacitance specifications 92
Frequency specifications 93
Sensitivity for voltage measurements 94

U1452A/U1452AT/U1451A User’s Guide XIII

Insulation resistance specifications 95
Earth-bond resistance specifications 97
EN61557 specifications 97
Display update rate (approximate) 99

XIV U1452A/U1452AT/U1451A User’s Guide

List of Figures

Figure 1-1 Keysight Handheld Meter Logger Software 8
Figure 1-2 Bluetooth adapter connection 9
Figure 1-3 Width dimension 10
Figure 1-4 Height and depth dimensions 11
Figure 1-5 Display screen allocation example 20
Figure 1-6 Connecting the remote switch probe 24
Figure 2-1 Insulation resistance test example 31
Figure 2-2 T/Time operation 34
Figure 2-3 DAR operation 35
Figure 2-4 PI operation 36
Figure 2-5 Earth-bond resistance test example 39
Figure 2-6 AC or DC voltage measurement example 42
Figure 2-7 Definition of frequency 45
Figure 2-8 Resistance measurement example 47
Figure 2-9 Continuity test example 49
Figure 2-10 Capacitance measurement example 51

U1452A/U1452AT/U1451A User’s Guide XV

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

XVI U1452A/U1452AT/U1451A User’s Guide

List of Tables

Table 1-1 Front panel part descriptions 12
Table 1-2 Rear panel parts 13
Table 1-3 U1452A/U1452AT/U1451A rotary switch functions 14
Table 1-4 U1452A/U1452AT/U1451A keypad functions 16
Table 1-5 General annunciators 20
Table 1-6 Measurement units display 22
Table 1-7 Analog bar graph display 23
Table 1-8 Terminal connections for different measuring

functions 24
Table 1-9 Power-on options 26
Table 2-1 Rotary switch position for insulation resistance

tests 30
Table 2-2 Earth-bond resistance test position 38
Table 2-3 AC and DC voltage measurement positions 41
Table 2-4 Resistance measurement position 46
Table 2-5 Continuity test position 48
Table 2-6 Capacitance measurement position 50
Table 3-1 Limit settling default values 57
Table 3-2 Log maximum capacity 59
Table 3-3 Event log trigger conditions 61
Table 4-1 Setup menu key functions 66
Table 4-2 Setup menu item descriptions 68
Table 5-1 DC voltage specifications with accuracy of ± (% of

reading + no. of least significant digit) 89
Table 5-2 Resistance specifications with accuracy of ± (% of

reading + no. of least significant digit) 90
Table 5-3 AC voltage specifications with accuracy of ± (% of

reading + no. of least significant digit) 91
Table 5-4 Capacitance specifications with accuracy of ± (% of

reading + no. of least significant digit)

[1][2][3]

92

Table 5-5 Frequency specifications with accuracy of ± (% of

reading + no. of least significant digit)

[1][2]

93
Table 5-6 Sensitivity for voltage measurements 94
Table 5-7 Insulation resistance specifications with accuracy of ±

(% of reading + no. of least significant digit) 95

U1452A/U1452AT/U1451A User’s Guide XVII

Table 5-8 Earth-bond resistance specifications with accuracy of ±

(% of reading + no. of least significant digit)

[1][2]

97

Table 5-9 Display update rate (approximate) 99

XVIII U1452A/U1452AT/U1451A User’s Guide

U1452A/U1452AT/U1451A Insulation Tester
User’s Guide

1 Introduction

About This Manual 2

Documentation map 2
Safety notes 2

Preparing Your Tester 3

Check the shipment 3
Install or change the batteries 3
Turn on your tester 6
Select the range 6
Adjust the tilt stand 7
Connect to the Handheld Meter Logger Software 8
Connect the Bluetooth adapter 9

Your Tester in Brief 10

Dimensions 10
Overview 12
Rotary switch 14
Keypad 16
Display screen 20

Input terminals 24
Cleaning Your Tester 25
Additional Features 26

Automatic power-off 26

Hazardous voltage indication 26

Power-on options 26

This chapter teaches you how to set up your tester for the
first time. An introduction to all the features of the tester is
also given.

1 Introduction

CAUTION

WARNING

About This Manual

About This Manual

Documentation map

The following manuals and software related to the
U1452A/U1452AT/U1451A Insulation Tester are available for download.
Please visit our website at http://www.keysight.com/find/hhTechLib for the
latest version.

Check the manual edition on the first page of each manual.

User’s Guide. This manual.

Quick Start Guide. Printed copy for outdoor use, included with shipment.

Service Guide. Downloadable from

http://www.keysight.com/find/hhTechLib

Keysight Handheld Meter Logger Software, Help, and Quick Start
Guide. Downloadable from http://www.keysight.com/hhmeterlogger

2 U1452A/U1452AT/U1451A User’s Guide

Safety notes

The following safety notes are used throughout this manual. More
pertinent safety notes for using this product are located under the “Safety

Symbols” section.

Caution denotes a hazard. It calls attention to a procedure that, if not correctly
performed or adhered to, could result in damage to or destruction of the product. Do
not proceed beyond a caution notice until the indicated conditions are fully understood
and met.

Warning denotes a hazard. It calls attention to a procedure which, if not correctly
performed or adhered to, could result in injury or loss of life. Do not proceed beyond
a warning note until the indicated conditions are fully understood and met.

Preparing Your Tester

CAUTION

Check the shipment

When you receive your tester, check the shipment according to the
following procedure.

1 Inspect the shipping container for damage. Signs of damage may include

a dented or torn shipping container or cushioning material that
indicates signs of unusual stress or compacting. Save the packaging
material in case the tester needs to be returned.

2 Carefully remove the contents from the shipping container, and verify

that the standard accessories and your ordered options are included in
the shipment according to the standard shipped items list found in the
printed copy of the U1452A/U1452AT/U1451A Quick Start Guide.

3 For any question or problems, refer to the Keysight contact numbers on

the back of this manual.

Introduction 1

Preparing Your Tester

U1452A/U1452AT/U1451A User’s Guide 3

Install or change the batteries

Your tester is powered by four 1.5 V AA alkaline batteries (included in the
shipment). When you receive your tester, the batteries are not installed.

Use the following procedure to install or change the batteries.

Before you proceed with the batteries installation, remove all cable connections to the
terminals and ensure that the rotary switch is at the position. Use only the battery
type specified in the “Product Characteristics” on page 86.

1 Introduction

Preparing Your Tester

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 up and remove the battery cover as

shown on the left.

4 Lift the inner rubber cover to access the

battery compartment.

5 Observe the proper batteries polarity. The

terminal ends of each battery are
indicated inside the battery
compartment. Insert four 1.5 V AA
batteries.

6 Ensure that the inner rubber cover is

positioned properly.

7 Replace the battery cover back in its

original position and tighten the screws.

8 Finally fit the orange rubber holster back

on the tester.

4 U1452A/U1452AT/U1451A User’s Guide

Introduction 1

Battery level indicator

WARNING

CAUTION

Preparing Your Tester

The battery level indicator in the upper left- hand corner of the display
indicates the relative condition of the batteries.

Replace the batteries as soon as possible when the low battery indicator
() is shown.

To avoid false readings, which could lead to possible electric shock or personal
injury, replace the battery as soon as the low battery indicator appears. Do not
discharge the battery by shorting the battery or reverse the battery polarity in any of
the subjects.

U1452A/U1452AT/U1451A User’s Guide 5

To avoid instruments being damage from battery leakage:

• Always remove dead batteries immediately.

• Always remove the batteries and store them separately if the tester is not going to

be used for a long period.

1 Introduction

Selected range
Autoranging indicator

Preparing Your Tester

Turn on your tester

To power ON your tester, turn the rotary switch from the position to
any other position.

Select the range

The tester’s selected range is always displayed on the right- hand end of
the bar graph.

6 U1452A/U1452AT/U1451A User’s Guide

Introduction 1

NOTE

To PC (host)

IR-USB cable

Pull until maximum reach

Preparing Your Tester

Pressing changes the tester range (and disables auto- ranging). Each
additional press of (in manual ranging) sets the tester to the next
higher range, unless it is already in the highest range, at which point the
range switches to the lowest range.

Press and hold to switch the tester to auto- ranging. Auto- ranging is
convenient because the tester automatically selects an appropriate range
for sensing and displaying each measurement.

• Changing the tester range (and disabling auto-ranging) is not allowed for earth-bond
resistance tests and insulation resistance tests.

• In auto-range, the tester selects the lowest range to display the highest available
precision (resolution) for the input signal.

• If a reading is greater than maximum available range, OL (overload) is shown on the
display — except for earth-bond resistance tests and insulation resistance tests where
to indicate maximum reading, > is shown on the display instead.

Adjust the tilt stand

To adjust the tester to a 60° standing position, pull the tilt- stand outward
to its maximum reach.

U1452A/U1452AT/U1451A User’s Guide 7

1 Introduction

Preparing Your Tester

Connect to the Handheld Meter Logger Software

You can use the IR communication link (IR communication port, located at
the rear panel) and the Keysight Handheld Meter Logger Software to
control your tester remotely, perform data logging operations, and transfer
the contents of your tester’s memory to a PC.

Ensure that the Keysight logo on the U1173A IR- USB cable connected to
the tester is facing up. Firmly push the IR head into the tester’s IR
communication port until it snaps into place.

Refer to the Keysight Handheld Meter Logger Software Help and Quick Start
Guide for more information on the IR communication link and the
Keysight Handheld Meter Logger Software.

Figure 1-1 Keysight Handheld Meter Logger Software

The Keysight Handheld Meter Logger Software and its supporting
documents (Quick Start Guide and Help) are available for download from

http://www.keysight.com/hhmeterlogger.

8 U1452A/U1452AT/U1451A User’s Guide

Introduction 1

Bluetooth adapter

Preparing Your Tester

Connect the Bluetooth adapter

The U1117A Infrared (IR)- to- Bluetooth® adapter allows you to connect
the tester wirelessly to any Windows PC, Android device, or iOS device.

The U1117A is compatible with the following application or software:

• Keysight Handheld Meter Logger (for Windows PC)

• Keysight Mobile Meter (for Android or iOS devices)

• Keysight Mobile Logger (for Android or iOS devices)

Snap the optic side of the U1117A to the tester’s IR communication port
(see Figure 1- 2).

Figure 1-2 Bluetooth adapter connection

Refer to the Keysight U1117A IR- to- Bluetooth Adapter Operating
Instructions (download from http://www.keysight.com/find/U1117A) for

more information on how to set up the U1117A to a Windows PC, Android
device, or iOS device.

U1452A/U1452AT/U1451A User’s Guide 9

1 Introduction

100 mm

Your Tester in Brief

Your Tester in Brief

Dimensions

Front view

Figure 1-3 Width dimension

10 U1452A/U1452AT/U1451A User’s Guide

Rear and side view

218 mm

58 mm

Introduction 1

Your Tester in Brief

Figure 1-4 Height and depth dimensions

U1452A/U1452AT/U1451A User’s Guide 11

1 Introduction

2

1

3

4

5

Your Tester in Brief

Overview

Front panel

The front panel parts of your tester are described in this section.

Tab l e 1 - 1 Front panel part descriptions

Legend Description Learn more on:

1 Red LED indicator page 54

2 Display screen page 20

3 Keypad page 16

4 Rotary switch page 14

5 Input terminals page 24

12 U1452A/U1452AT/U1451A User’s Guide

Introduction 1

1

2

3

4

5

Your Tester in Brief

Rear panel

The rear panel parts of your tester are described in this section.

Tab l e 1 - 2 Rear panel parts

Legend Description Learn more on:

1 IR communication port page 8

2 Test lead/probe holders -

3 Battery access (under the orange rubber holster) page 3

4 Tilt stand page 7

5 Fuse access (under the orange rubber holster) -

U1452A/U1452AT/U1451A User’s Guide 13

1 Introduction

WARNING

NOTE

U1452A U1452AT U1451A

Your Tester in Brief

Rotary switch

The measurement functions for each rotary switch position are described
in Table 1- 3. Turning the rotary switch changes the measurement function
and resets all other measurement options.

Remove the test leads from the measuring source or target before changing the
rotary switch position.

Press to select the alternate measurement function(s) or test methods for insulation
resistance tests. See page 16 for more information on the key.

Tab l e 1 - 3 U1452A/U1452AT/U1451A rotary switch functions

Legend Measurement function U1452A U1452AT U1451A Learn more on:

14 U1452A/U1452AT/U1451A User’s Guide

50 V Insulation resistance test

T - Timed test

DAR - Dielectric Absorption Ratio test

PI - Polarization Index Test

✔✔

✔✔

✔✔

✔✔

-

-

page 38

-

-

Introduction 1

Your Tester in Brief

Tab l e 1 - 3 U1452A/U1452AT/U1451A rotary switch functions (continued)

Legend Measurement function U1452A U1452AT U1451A Learn more on:

100 V Insulation resistance test

T - Timed test

DAR - Dielectric Absorption Ratio test

PI - Polarization Index Test

250 V Insulation resistance test

T - Timed test

DAR - Dielectric Absorption Ratio test

PI - Polarization Index Test

500 V Insulation resistance test

T - Timed test

DAR - Dielectric Absorption Ratio test

PI - Polarization Index Test

1000 V Insulation resistance test

T - Timed test

DAR - Dielectric Absorption Ratio test

PI - Polarization Index Test

✔✔

✔✔

✔✔

✔✔

✔

✔

✔

✔

✔

✔

✔

✔

✔

✔

✔

✔

-

-

--

--

-

-

--

--

-

-

--

--

-

-

page 38

-

-

✔

✔

page 38

✔

✔

page 38

✔

✔

page 38

Earth-bond resistance test

T - Timed test

Resistance measurement

Continuity test

Capacitance measurement

Auto voltage measurement

AC voltage measurement

✔✔✔

✔✔✔

✔✔✔

✔✔✔

✔✔✔

✔✔✔

✔✔✔

✔✔✔

page 38

page 46

page 48

page 50

page 30DC voltage measurement

U1452A/U1452AT/U1451A User’s Guide 15

1 Introduction

U1452A/U1452AT U1451A

Your Tester in Brief

Keypad

The operation of each key is explained in Table 1- 4 below. Pressing a key
enables a function, displays a related symbol, and emits a beep. Turning
the rotary switch to another position resets the current operation of the
key.

Tab l e 1 - 4 U1452A/U1452AT/U1451A keypad functions

Legend

Insulation Resistance (IR) Test: Initiates an IR test (when the rotary switch is in one of the Ω

positions) as long as is held — the tester sources (outputs) a high voltage and measures
insulation resistance and is shown on the display.

Earth-Bond Resistance (EBR) Test: Initiates an EBR test (when the rotary switch is in the Ω EB
position) as long as is held — the tester measures earth-bond resistance and is
shown on the display.

Trig Hold: Freezes the present reading in the
display (except when the rotary switch is in one
of the Ω

• In TrigHold mode, press to manually
trigger the holding of the next measured
value.

• Press and hold again to exit this
mode.

Less than 1 second More than 1 second

positions or in the Ω EB position).

Mega

Function when pressed for:

Auto Hold: Automatically freezes the present

reading once the reading is stable (except when
the rotary switch is in one of the Ω
positions or in the Ω EB position).

• In AutoHold mode, the reading is updated
automatically once the reading is stable and
the count setting is exceeded.

• Press and hold again to exit this
mode.

Mega

16 U1452A/U1452AT/U1451A User’s Guide

Mega

Tab l e 1 - 4 U1452A/U1452AT/U1451A keypad functions (continued)

U1452A/U1452AT

U1451A

U1452A/U1452AT

U1451A

Introduction 1

Your Tester in Brief

Legend

Function when pressed for:

Less than 1 second More than 1 second

Lock: Press to lock the insulation test or

earth-bond resistance test (when the rotary
switch is in the appropriate position).

Press > to initiate an IR or EBR
test. The test will remain active until you press

or again to release the lock.

Hz: Press to display the frequency for
voltage or current measurements.

Press again to disable the frequency
display.

Esc: Press in the Setup menu to discard
your changes.

Press to switch or cycle between the
default and alternate measurement function(s).

T: Configures the tester for a timed test (when
the rotary switch is in one of the Ω

Mega

positions or the Ω EB position).

The test will start when you press .

DAR: Configures the tester for a dielectric
absorption ratio test (when the rotary switch is
in one of the Ω

Mega

positions).

The test will start when you press .

PI: Configures the tester for a polarization index
test (when the rotary switch is in one of the

Ω

positions).

Mega

The test will start when you press .

View: Press and hold to enter the Log
Review menu.

• Press to cycle through the previously
recorded manual (VIEW H), interval (VIEW A),
or event (VIEW E) logging data.

• Press or to view first or last
logged data respectively.

• Press or to scroll through the logged
data.

• Press to delete the last logged data.

• Press and hold to clear all the logged

data for the selected logging mode.

• Press and hold again to exit this mode.

Log: The recording option (HAND, AUTO, or

TRIG) must first be selected in the Setup menu
(see page 80).

• HAND (manual data logging) — Press and
hold to log the present reading into the
memory. The display will return to normal
after a short while (≈ 1 second). To manually
log another reading, press and hold
again.

• AUTO (automatic data logging) — Press and
hold to enable the automatic data
logging mode, where data is logged at the
interval defined in the Setup menu (see

page 79). Press and hold again to exit

this mode.

• TRIG (event data logging) — Press and hold

to enable the event data logging mode,
where data is logged each time a triggering
condition is satisfied (see page 62). Press and
hold again to exit this mode.

U1452A/U1452AT/U1451A User’s Guide 17

1 Introduction

U1452A/U1452AT

U1451A

Your Tester in Brief

Tab l e 1 - 4 U1452A/U1452AT/U1451A keypad functions (continued)

Legend

Function when pressed for:

Less than 1 second More than 1 second

Limit: Press to enable the comparison for

limit mode.

• Press again to set the comparison
value. Use the arrow keys to change the value
shown and press to save your changes.

• Press and hold to exit this mode.

Range: Press to set a manual range and

disable auto-ranging.

Press again to cycle through each
available measurement range.

Leak: Press to display the leakage current.

Null: Press to enable the relative function.

• The displayed value is saved as a reference to

be subtracted from subsequent
measurements.

• Press again to view the stored reference
value that has been saved. The display will
return to normal after a brief period of time
(approx. 3 seconds).

• Pressing while the stored reference
value is being displayed will cancel the
relative function.

Smooth: Press and hold to smoothen the
refresh rate of the readings.

Press and hold again to exit this mode.

Auto: Press and hold to enable
auto-ranging.

-

18 U1452A/U1452AT/U1451A User’s Guide

Tab l e 1 - 4 U1452A/U1452AT/U1451A keypad functions (continued)

Introduction 1

Your Tester in Brief

Legend

Less than 1 second More than 1 second

: Press to enable or disable the LCD

backlight.

Function when pressed for:

Setup: Press and hold to enter the Setup

menu.

• In the Setup menu, press or to
navigate through the menu pages. Press
or at each menu page to move the cursor
to a specific menu item.

• Press to change the value of the
selected menu item. Use the arrow keys to
change the value shown.

• Press again to save your changes, or
press to discard your changes.

• Press and hold again to exit the Setup
menu.

U1452A/U1452AT/U1451A User’s Guide 19

1 Introduction

Your Tester in Brief

Display screen

The display annunciators of your tester are described in this section. See
also “Measurement units” on page 22 for a list of available measurement
signs and notations and “Analog bar graph” on page 23 for a tutorial on
the analog bar graph located at the bottom of your display screen.

Display annunciators

The display annunciators of your tester are described in the Table 1- 5.

Figure 1-5 Display screen allocation example

Tab l e 1 - 5 General annunciators

Legend Description

Remote control enabled

Battery capacity indication

Analog bar graph

Test indication for insulation resistance and earth-bond resistance tests

Hazardous voltage sign for measuring voltage ≥30 V or OL (overload)

20 U1452A/U1452AT/U1451A User’s Guide

Tab l e 1 - 5 General annunciators (continued)

Legend Description

Auto hold/Trigger hold enabled

Polarization Index test enabled

Dielectric Absorption Ratio test enabled

Timed test enabled

Relative (Null) enabled

Smooth mode enabled

Auto-ranging enabled or Auto signal indicator enabled

Greater than range (for insulation resistance and earth-bond resistance tests)

Test and Test Lock indication for insulation resistance and earth-bond
resistance tests

Introduction 1

Your Tester in Brief

Primary display

AC or DC indication

Measuring units for primary display

Test time indication for earth-bond resistance and insulation resistance tests

APO (Auto Power-Off) enabled

Limit comparison enabled

Data logging in progress

U1452A/U1452AT/U1451A User’s Guide 21

1 Introduction

Your Tester in Brief

Tab l e 1 - 5 General annunciators (continued)

Legend Description

View mode for reviewing previously logged data

Audible continuity test selected

Secondary display

Measuring units and AC+DC indication for secondary display

Tertiary display

Measuring units for tertiary display

Measurement units

The available signs and notations for each measurement function in your
tester are described in Table 1- 6. The units listed below are applicable to
the primary display and secondary display measurements of your tester.

Tab l e 1 - 6 Measurement units display

Sign/Notation Description

G Giga 1E+09 (1000000000)

M Mega 1E+06 (1000000)

k kilo 1E+03 (1000)

n nano 1E–09 (0.000000001)

μ micro 1E–06 (0.000001)

m milli 1E–03 (0.001)

mV, V Voltage, units for voltage measurement

nF, μF, mF Farad, units for capacitance measurement

22 U1452A/U1452AT/U1451A User’s Guide

Introduction 1

NOTE

Your Tester in Brief

Tab l e 1 - 6 Measurement units display (continued)

Sign/Notation Description

Ω, kΩ, MΩ, GΩ, Ohm, units for resistance measurement

kHz, Hz Hertz, units for frequency measurement

m Meter, unit for length

ft Feet, unit for length

Analog bar graph

The analog bar emulates the needle on an analog tester, without displaying
the overshoot.

For frequency measurements, the bar graph does not represent the primary display value.

For example, when frequency is displayed on the primary display during voltage
measurement, the bar graph represents the voltage value (not the frequency value).

The “–” sign indicates that the measured or calculated value is negative.
Each segment is presented as a ratio to the range value indicated on the
peak bar- graph. The unit and range will be indicated according to various
measurements (see Table 1- 7).

Tab l e 1 - 7 Analog bar graph display

Function Bar graph

V

Ω , Ω EB , Ω

Mega

U1452A/U1452AT/U1451A User’s Guide 23

1 Introduction

WARNING

The remote switch probe is
used for insulation resistance
(IR) and earth-bond resistance
(EBR) tests.

Remote switch
probe terminal for
IR and EBR tests

Your Tester in Brief

Input terminals

To avoid damaging this device, do not exceed the input limit.

The terminal connections for the different measurement functions of your
tester are described in the table below.

Tab l e 1 - 8 Terminal connections for different measuring functions

Rotary switch position Input terminals Overload protection

1000 Vrms

1000 Vrms for
short circuit <0.3 A

24 U1452A/U1452AT/U1451A User’s Guide

440 mA/1000 V, 30 kA
fast-acting fuse

Figure 1-6 Connecting the remote switch probe

Cleaning Your Tester

WARNING

To avoid electrical shock or damage to the tester, ensure that the insides of the
casing stay dry at all times.

Dirt or moisture in the terminals can distort readings. Follow the steps
below to clean your tester.

1 Turn the tester off, and remove the test leads.

2 Turn the tester over, and shake out any dirt that may have accumulated

in the terminals.

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.

Introduction 1

Cleaning Your Tester

U1452A/U1452AT/U1451A User’s Guide 25

1 Introduction

Additional Features

Additional Features

Automatic power-off

Your tester automatically turns off if the rotary switch is not moved or a
key is not pressed for 10 minutes (default). Pressing any key will turn the
tester back on after it is powered off automatically.

To change the timer period or completely disable the automatic power- off,
refer to “Changing the auto power- off (APO) timer” on page 73.

Hazardous voltage indication

The tester will display the hazardous voltage ( ) symbol as an early
precaution when the measured voltage is equal to or greater than
±DC 30 V or AC 30 V, or when the measured voltage is over the
measurement range, OL (overload).

Power-on options

Some options can be selected only while you turn the tester on. These
power- on options are listed in the table below. To select a power- on
option, press and hold the specified key while turning the rotary switch
from the position to any other position. Power- on options remain
selected until the tester is turned off.

Tab l e 1 - 9 Power-on options

Key Description

Simulates the Auto Power-Off (APO) mode. Press any key to turn the tester
back on and resume normal operation.

Checks firmware version. The tester’s firmware version will be shown on
the primary display. Press any key to exit this mode.

26 U1452A/U1452AT/U1451A User’s Guide

Tab l e 1 - 9 Power-on options (continued)

U1452A/U1452AT

U1451A

Key Description

Toggles the red LED indicator alert for insulation resistance tests. If
enabled, the red LED indicator will blink every two seconds during an
insulation resistance test.

The red LED indicator alert is disabled when the Limit feature (see page 57)
is enabled.

‘

Change the resolution count to high. To permanently enable change the
resolution count. See “Changing the display count” on page 76.

Tests the LCD. All LCD annunciators are lighted. Press any key to exit this
mode.

Introduction 1

Additional Features

U1452A/U1452AT/U1451A User’s Guide 27

1 Introduction

Additional Features

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

28 U1452A/U1452AT/U1451A User’s Guide

U1452A/U1452AT/U1451A Insulation Tester
User’s Guide

2 Making Measurements

Insulation Resistance Test 30

Using the Remote Switch Probe 32
Locking the test 33
Timed insulation resistance/earth-bond resistance test 34
Measuring the Dielectric Absorption Ratio (DAR) 35
Measuring the Polarization Index (PI) 36

Viewing the leakage current 37
Earth-Bond Resistance Test 38
Measuring AC or DC Voltage 41

Auto AC or DC signal identification 43
Measuring Frequency 44
Measuring Resistance 46
Continuity Test 48
Measuring Capacitance 50

The following sections describe how to take measurements
with your tester.

2 Making Measurements

CAUTION

Insulation Resistance Test

Insulation Resistance Test

Set up your tester as shown in Figure 2- 1. Set the rotary switch to a test
voltage value that does not exceed the maximum voltage limitation of the
circuit under test. Ensure that the device-under-test (DUT) is de-energized
before performing any resistance measurement.

Tab l e 2 - 1 Rotary switch position for insulation resistance tests

Legend Default function Function when is pressed

Rotary
switch
position

Primary display Secondary

display

50 V insulation
resistance test

100 V insulation
resistance test

250 V insulation
resistance test

500 V insulation
resistance test

1000 V insulation
resistance test

AC+DC V

or

DC V (during test)

Primary display Secondary

display

1 Timed (T) test
2 Dielectric

Absorption
Ratio (DAR)
test

3 Polarization

Index (PI) test

AC+DC V

or

DC V (during test)

•DO NOT perform insulation resistance test in distribution systems with voltages
higher than 600 V.

• The tester automatically detects if the circuit is energized. If the external voltage is
detected to be greater than 30 V (or 50 V or 75 V; depending on selected option in
Setup), the test is inhibited. The symbol

is shown on the display when either the

external voltage or the test voltage is greater than 30 V. Disconnect the tester and
remove the power of the circuit before proceeding.

30 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

3

2

1

4

Remote
Switch Probe

Hold

Test will continue until

is released.

Insulation Resistance Test

Figure 2-1 Insulation resistance test example

U1452A/U1452AT/U1451A User’s Guide 31

2 Making Measurements

CAUTION

NOTE

=

Insulation Resistance Test

The insulation meter will auto-discharge the DUT when the test complete. However,
the DUT will not be auto-discharged when you disconnect the probe before the test is
complete. Avoid touching the DUT when the DUT is not fully discharged as it may lead
to possible electric shock.

When an insulation test is in progress, the red LED indicator at the top of the tester will
blink every 2 seconds (if the Limit function is not enabled). To disable this feature see

“Power-on options” on page 26.

Using the Remote Switch Probe

The Remote Switch Probe (included in shipment) is used with insulation
resistance tests and earth- bond resistance tests, enabling the tester to be
controlled remotely from the button on the Remote Switch Probe.

By default the button on the Remote Switch Probe emulates the
button on the tester.

32 U1452A/U1452AT/U1451A User’s Guide

To change the default button operation, see “Changing the button

operation on the remote switch probe” on page 82

Making Measurements 2

2

1

Press once

Press or again
to unlock and stop the test.

Lock symbol

Insulation Resistance Test

Locking the test

You can lock the insulation resistance tests or earth- bond resistance tests
temporarily.

Press to enable the lock once feature. The symbol will be shown
on the display. The test will start when you press , and it remain
active until or is pressed again.

By default, the tester will reset the locked status when the test is stopped
by pressing or . See “Changing the Dielectric Absorption

Ratio (DAR) for IR tests” on page 83 to disable this feature.

If you disable this feature, you will need to press to unlock the
tester, even if the test has already stopped.

U1452A/U1452AT/U1451A User’s Guide 33

2 Making Measurements

Press / and

select the timed test.

After 30 seconds.

After 1 minute, time up.

Press to view

the resistance value.

Press to

view the timer.

Press

again to stop the test.

Press

to start the test.

Insulation Resistance Test

Timed insulation resistance/earth-bond resistance test

Use the timed test to obtain measurement results with consistent test
times — for later comparisons. Set up your tester as shown in Figure 2- 1,
and follow the steps shown below.

Figure 2-2 T/Time operation

34 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

Press and

select the DAR test.

Press to

start the test.

After 30 seconds.

After 1 minute, time up.

Press to view t0.

Press to view t00.

DAR > 999.9

Error as IR (t0) > maximum range

Press to
view the timer.

Press to view

the resistance value.

Insulation Resistance Test

Measuring the Dielectric Absorption Ratio (DAR)

Dielectric Absorption Ratio (DAR) is the ratio of the insulation resistance
tested at 60 seconds to the insulation resistance tested at 30 seconds. Set
up your tester as shown in Figure 2-1, and follow the steps shown below.

Figure 2-3 DAR operation

U1452A/U1452AT/U1451A User’s Guide 35

2 Making Measurements

Press and

select the PI test.

Press to

start the test.

After 1 minute.

After 10 minutes, time up.

Press to view t0.

Press to view t00.

PI > 999.9

Press to
view the timer.

Press to view

the resistance value.

Error as IR (t0) > maximum range

Insulation Resistance Test

Measuring the Polarization Index (PI)

Polarization Index (PI) is the ratio of the insulation resistance tested at 10
minutes to the insulation resistance tested at 1 minute. Set up your tester

as shown in Figure 2-1, and follow the steps shown below.

Figure 2-4 PI operation

36 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

NOTE

Insulation Resistance Test

• Because of the time required to perform the T, PI, and DAR tests, the use of alligator test
clips is recommended.

• For timed (page 34) tests, The length of the timer is 1 minute by default. To change this
value, see “Changing the IR and EBR test period” on page 80 for more information.

• For DAR (page 35) tests, you can change the DAR from 60:30 to 60:15 in the Setup. See

“Changing the Dielectric Absorption Ratio (DAR) for IR tests” on page 83 for more

information.

• For DAR (page 35) and PI (page 36) tests, Err is shown on the display if the IR is greater
than the maximum range or less than 0.001 MΩ; if the test is interrupted by the user; or
if the tester’s battery is low.

Viewing the leakage current

Press to view the leakage current display. The leakage current
display is related to the insulation resistance. The higher the resistance
tested, the lower the current is to be measured.

U1452A/U1452AT/U1451A User’s Guide 37

2 Making Measurements

CAUTION

NOTE

Earth-Bond Resistance Test

Earth-Bond Resistance Test

Set up your tester to perform earth- bond resistance tests as shown in

Figure 2- 5.

Tab l e 2 - 2 Earth-bond resistance test position

Legend Default function Function when is pressed

Rotary
switch
position

Primary display

Earth-bond
resistance test

Secondary
display

AC+DC V

or

DC V (during test)

Primary display

Timed (T) test

Secondary
display

AC+DC V

or

DC V (during test)

• To avoid possible damage to your tester or to the equipment under test, disconnect
the circuit power and discharge all high-voltage capacitors before measuring
resistance.

• The tester automatically detects if the circuit is energized. If the external voltage is
detected to be greater than 2 V, the test will not start. Disconnect the tester and
remove power before proceeding.

• The earth-bond resistance function is used to measure the resistance between earth
conductors, protective earth conductors, and conductors for equipotential bonding;
including their connections and terminals; with an indication of the measured value or
indication of limits.

• The voltage source is <6.8 V, and the current is >200 mA when the resistance of ≤2 Ω is
to be measured. When the source voltage is <4.7 V, the tester will inhibit the test
automatically. The secondary display indicates the voltage (with auto-ranging enabled).

• The APO (auto power-off) function is disabled during the test.

• See also “Timed insulation resistance/earth-bond resistance test” on page 34.

38 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

3

2

1

4

>

Remote
Switch Probe

Hold

Test will continue until

is released.

OR

Earth-Bond Resistance Test

Figure 2-5 Earth-bond resistance test example

U1452A/U1452AT/U1451A User’s Guide 39

2 Making Measurements

Fuse blown;
replace fuse.

Earth-Bond Resistance Test

Using the earth-bond resistance test to verify the fuse condition

1 Keep the test leads open, and ensure that no voltage is applied to the

terminals.

2 Press and hold to verify the fuse condition.

3 If the fuse has been blown, FUSE will be shown on the display. Follow

the instructions in the U1452A/U1452AT/U1451A Service Guide to
replace the fuse.

40 U1452A/U1452AT/U1451A User’s Guide

Measuring AC or DC Voltage

NOTE

Set up your tester to measure AC or DC voltage as shown in Figure 2- 6.

Tab l e 2 - 3 AC and DC voltage measurement positions

Legend Default function Function when is pressed

Making Measurements 2

Measuring AC or DC Voltage

Rotary
switch
position

Primary display

Auto (V) AC+DC V

Secondary
display

Primary display

Cycles between

1 DC V
2 AC V
3 Auto (V)

Secondary
display

1 AC+DC V
2 AC+DC V
3 AC+DC V

• This tester displays DC voltage values as well as their polarity. Negative DC voltages will

return a negative sign on the left of the display.

• Press to measure the frequency of the voltage source. See “Measuring

Frequency” on page 44 to learn more.

U1452A/U1452AT/U1451A User’s Guide 41

2 Making Measurements

AC

3

DC

2

1

Measuring AC or DC Voltage

Figure 2-6 AC or DC voltage measurement example

42 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

The symbol blinks during the identification.

The AC+DC value is shown
in the secondary display.

Measuring AC or DC Voltage

Auto AC or DC signal identification

The Auto function is able to automatically identify the signal component
(AC or DC) of an electrical source and select a suitable measurement
range according to the AC+DC reading.

The Auto function identifies the signal component using the following
rules:

• It will consider which component value is greater between the AC or
DC.

• The AC value should be greater than a minimum value of 50 counts
(based on 6000 counts) of range to prevent residual value due to range
changing.

• The frequency measured is greater than 10 Hz for the AC mode.

While the signal is being identified, you can press to lock the (AC or
DC) signal on the primary display.

At any time, you can press to stop the Auto function and lock the
identified signal component (AC or DC).

U1452A/U1452AT/U1451A User’s Guide 43

2 Making Measurements

WARNING

NOTE

Measuring Frequency

Measuring Frequency

Your tester allows simultaneous monitoring of real- time voltage with
frequency measurements. To measure frequency, rotate the switch to
measure voltage (see Figure 2- 6) and set up the tester accordingly.

Press . Probe the test points, and read the display.

Never measure the frequency where the voltage level exceeds the specified range.
Manually set the voltage range if you want to measure frequencies below 20 Hz.

• Pressing controls the input range of the voltage function and not the frequency

range.

• To obtain the best measuring results for frequency measurements, please use the AC
measuring path.

Frequency measurement techniques

44 U1452A/U1452AT/U1451A User’s Guide

• Measuring the frequency of a signal helps detect the presence of
harmonic currents in neutral conductors and determines whether these
neutral currents are the result of unbalanced phases or non- linear
loads.

• Frequency is the number of cycles a signal completes each second.
Frequency is defined as 1/Period. Period is defined as the time between
the middle threshold crossings of two consecutive, like- polarity edges,
as shown in Figure 2-7.

• The tester measures the frequency of a voltage signal by counting the
number of times the signal crosses a threshold level within a specified
period of time.

• If a reading shows as 0 Hz or is unstable, the input signal may be
below or near the trigger level. You can usually correct these problems
by manually selecting a lower input range, which increases the
sensitivity of the tester.

Making Measurements 2

Rise Time Fall Time

+ Width – Width

Period

90%
50%
10%

Measuring Frequency

• If a reading seems to be a multiple of what you expect, the input signal
may be distorted. Distortion can cause multiple triggerings of the
frequency counter. Selecting a higher voltage range might solve this
problem by decreasing the sensitivity of the tester. In general, the
lowest frequency displayed is the correct one.

• The frequency of the input signal is shown in the primary display. The
voltage value of the signal is shown in the secondary display. The bar
graph does not indicate frequency but indicates the voltage value of the
input signal.

Figure 2-7 Definition of frequency

U1452A/U1452AT/U1451A User’s Guide 45

2 Making Measurements

CAUTION

NOTE

Measuring Resistance

Measuring Resistance

Set up your tester to measure resistance as shown in Figure 2- 8.

Tab l e 2 - 4 Resistance measurement position

Legend Default function Function when is pressed

Rotary
switch
position

Primary display

Resistance - Continuity -

Secondary
display

Primary display

Secondary
display

To avoid possible damage to your tester or to the equipment under test, disconnect the
circuit power and discharge all high-voltage capacitors before measuring resistance.

Resistance (opposition to the current flow) is measured by sending a small current out
through the test leads to the circuit under test. Because this current flows through all
possible paths between the leads, the resistance reading represents the total resistance of
all paths between the leads. Resistance is measured in ohms (Ω).

Keep the following in mind when measuring resistance.

• The test leads can add 0.1 Ω to 0.2 Ω of error to resistance measurements. To test the
leads, touch the probe tips together and read the resistance of the leads. To remove lead
resistance from the measurement, hold the test lead tips together and press . Now
the resistance at the probe tips will be subtracted from all future display readings.

• Because the tester’s test current flows through all possible paths between the probe
tips, the measured value of a resistor in a circuit is often different from the resistor’s
rated value.

46 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

3

2

1

Measuring Resistance

Figure 2-8 Resistance measurement example

U1452A/U1452AT/U1451A User’s Guide 47

2 Making Measurements

CAUTION

NOTE

Continuity Test

Continuity Test

Set up your tester to perform continuity tests as shown in Figure 2- 9. The
beeper will sound and the red will light LED up as a continuity indication.

Tab l e 2 - 5 Continuity test position

Legend Default function Function when is pressed

Rotary
switch
position

Primary display

Resistance - Continuity -

Secondary
display

Primary display

Secondary
display

To avoid possible damage to your tester or to the equipment under test, disconnect the
circuit power and discharge all high-voltage capacitors before testing for continuity.

• Continuity is the presence of circuit continuities. The beeper sounds as the resistance
falls down to the threshold, and the red LED indicator will be lit (if enabled in the Setup).
The audible and visual alert allows you to perform quick continuity tests without having
to watch the display.

• The continuity function detects intermittent shorts and opens. A brief short causes the
tester to emit a short beep.

• You can enable or disable the audible alert via the Setup. See “Changing the continuity

alert” on page 74 for more information on the audible alert option.

48 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

2

1

3

ON

(closed)

OFF

(open)

4

Continuity Test

Figure 2-9 Continuity test example

U1452A/U1452AT/U1451A User’s Guide 49

2 Making Measurements

CAUTION

NOTE

Measuring Capacitance

Measuring Capacitance

Set up your tester to measure capacitance as shown in Figure 2- 10. The
cable length of the circuit under test in shown in the secondary display.

• The default cable length scale is 1 km per 40 nF (km/C). To change this
value, see “Changing the cable length scale” on page 78.

• You can also change the cable length unit (Meter or Feet). To change
this value, see “Changing the cable length unit” on page 77.

Tab l e 2 - 6 Capacitance measurement position

Legend Default function Function when is pressed

Rotary
switch
position

Primary display

Capacitance Cable length - -

Secondary
display

Primary display

Secondary
display

To avoid possible damage to the tester or to the equipment under test, disconnect
circuit power and discharge all high-voltage capacitors before measuring capacitance.
Use the DC voltage function to confirm that the capacitor is fully discharged.

• The tester measures capacitance by using an AC sine wave.

• The resistance of the test leads will impact the accuracy of the measurement. It is

recommended to use short leads to measure capacitance.

• The test frequency is 54.5 Hz.

50 U1452A/U1452AT/U1451A User’s Guide

Making Measurements 2

1

3

+

–

2

Measuring Capacitance

Figure 2-10 Capacitance measurement example

U1452A/U1452AT/U1451A User’s Guide 51

2 Making Measurements

Measuring Capacitance

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

52 U1452A/U1452AT/U1451A User’s Guide

U1452A/U1452AT/U1451A Insulation Tester
User’s Guide

3 Tester Features

Making Relative Measurements (Null) 54
Freezing the Display (TrigHold and AutoHold) 55
Performing Limit Comparisons (Limit) 57
Recording Measurement Data (Log) 59

Performing manual logs (HAND) 60
Performing interval logs (AUTO) 60
Performing event logs (TRIG) 61

Reviewing Previously Recorded Data (View) 63

The following sections describe the additional features
available in your tester.

3 Tester Features

NOTE

NOTE

Making Relative Measurements (Null)

Making Relative Measurements (Null)

When making null measurements, also called
relative, each reading is the difference
between a stored (selected or measured) null
value and the input signal.

One possible application is to increase the
accuracy of a resistance measurement by
nulling the test lead resistance.

Null can be set for both auto and manual range settings, but not in the case of an overload.

1 To activate Null, press . The measurement value at the time that

when Null ( ) is enabled, is stored as the reference value.

2 Press again to view the stored reference value (the annunciator

blinks). The display will return to normal after 3 seconds.

3 To disable Null, press while the stored reference value is shown

(step 2).

For any measurement function, you can directly measure and store the
null value by pressing with the test leads open (nulls the test lead
capacitance), shorted (nulls the test lead resistance), or across a desired
null value circuit.

• In resistance measurement, the tester will read a non-zero value even when the two test
leads are in direct contact, because of the resistance of these leads. Press to
zero-adjust the display.

• For DC voltage measurements, the thermal effect will influence the accuracy of the
measurements. Short the test leads and press when the displayed value is stable to
zero-adjust the display.

54 U1452A/U1452AT/U1451A User’s Guide

Freezing the Display (TrigHold and AutoHold)

NOTE

NOTE

Freezing the Display (TrigHold and AutoHold)

TrigHold operation

Press to freeze the display for any
function, except for the Ω
function.

Press again to trigger a new
reading. The annunciator blinks while
waiting for the reading to be stable.

Press and hold to exit this mode.

or the Ω EB

Mega

Tester Features 3

Pressing when the rotary switch is in one of the Ω

test being performed instead.

or the Ω EB position will result in a

Mega

AutoHold operation

Press and hold to activate AutoHold
for any function, except for the Ω

Ω EB function.

AutoHold monitors the input signal and
updates the display and, if enabled, emits a
beep, whenever a new stable measurement is
detected. The annunciator blinks while waiting for the reading to be
stable.

Press and hold to exit this mode.

Pressing and holding when the rotary switch is in one of the Ω

will result in a test being performed instead.

Mega

or the

or the Ω EB position

Mega

U1452A/U1452AT/U1451A User’s Guide 55

3 Tester Features

NOTE

Freezing the Display (TrigHold and AutoHold)

A trigger point is one that varies more than a selected adjustable
(AutoHold threshold) variation count (default 500 counts). The following
conditions are not included in the update.

Function None updated counts

Volt age 50

Resistance OL or Open

Capacitance 50

To change the default AutoHold threshold count see “Changing the

variation count” on page 71 for more information.

If the reading value is unable to reach a stable state, the reading value will not be updated.

56 U1452A/U1452AT/U1451A User’s Guide

Performing Limit Comparisons (Limit)

Limit is used to compare the test result with
the chosen settling value. The default settling
values are shown in the table below.

You can set pass condition to be > or < the
value measured.

Tab l e 3 - 1 Limit settling default values

Tester Features 3

Performing Limit Comparisons (Limit)

Function Default value Range

Voltage measurement

Resistance measurement <10 Ω Auto or Manual 1 Ω < LS < 90 MΩ

Capacitance measurement

Earth-bond resistance test <10 Ω Auto 1 Ω < LS < 90 kΩ

Insulation resistance test >10 MΩ Auto 1 kΩ < LS < 90 GΩ

[1] Absolute value comparison, regardless of polarity.

[2] Limit for capacitance is represented without a unit.

[1]

[2]

>30 V Auto or Manual 1 V < LS < 900 V

>10 Range locked 10 < LS < 900

Limit

settling range

1 Press to activate Limit.

2 Press again to set the comparison value. Use the arrow keys to

position the cursor and to change the value shown.

The most significant digit can be set to a value from 1 to 9. The
remaining two digits can be set to 0, 00, or left blank along with any
unit combination (see Table 3- 1).

3 Position the cursor on the > annunciator to change the Limit pass

condition (< or >).

4 Press to save your changes (or press to discard your

changes).

U1452A/U1452AT/U1451A User’s Guide 57

3 Tester Features

NOTE

Performing Limit Comparisons (Limit)

5 If the new value is passed:

•

PAS is shown

• A short beep tone is heard

• The red LED blinks once

6 If the new value is failed:

•

FAi is shown

• Three short beep tones are heard

• The red LED blinks thrice

When the Limit feature is enabled for insulation resistance tests, the red LED indicator
lights up accordingly to the changes in the limit values instead of blinking every 2 seconds.

58 U1452A/U1452AT/U1451A User’s Guide

Recording Measurement Data (Log)

NOTE

Log provides you with the convenience of recording test data for future
review or analysis. Since data is stored in the nonvolatile memory, the
data remains saved even when the tester is turned OFF or if the battery
is replaced.

Log collects measurement information over a user- specified duration.
There are three Log options that can be used to capture measurement
data: manual (HAND), interval (AUTO), or event (TRIG).

• A manual log stores an instance of the measured signal each time you
press and hold (see page 60).

• An interval log stores a record of the measured signal at a
user- specified interval (see page 60).

• An event log stores a record of the measured signal each time a trigger
condition is satisfied (see page 61).

Tab l e 3 - 2 Log maximum capacity

Tester Features 3

Recording Measurement Data (Log)

Log option Maximum capacity for saving

Manual (HAND) H00 to H99 (100 entries)

Interval (AUTO) A00 to A99 (100 entries)

Event (TRIG) E00 to E99 (100 entries)

Each recorded index includes two parameters: the primary display and the secondary
display. Examples include IR-V or V-Hz.

Before starting a recording session, set up the tester for the measurements
to be recorded.

To change the Log option see “Changing the recording option” on page 80
for more information.

See “Reviewing Previously Recorded Data (View)” on page 63 to review or
erase the recorded entries.

U1452A/U1452AT/U1451A User’s Guide 59

3 Tester Features

Recording Measurement Data (Log)

Performing manual logs (HAND)

Ensure that HAnd is selected as the Log
option in the Setup.

1 Press and hold to store the present

input signal value.

and the log entry number are

displayed. The display will return to
normal after a short while (around
1 second).

2 Repeat step 1 again to save the next input signal value.

The maximum number of readings that can be stored for the manual log is
100 entries. When all entries are occupied,
press and hold .

HFU will be shown when you

Performing interval logs (AUTO)

Ensure that AUto is selected as the Log
option in the Setup.

The default recording interval duration is
1 second. To change the recording interval
duration, see “Changing the sample interval

duration” on page 79 for more information.

The duration set in the Setup will determine
how long each recording interval takes. The input signal value at the end
of each interval will be recorded and saved into the tester’s memory.

Start the interval log mode

1 Press and hold to start interval log mode.

and the log entry number are displayed. Subsequent readings are
automatically recorded into the tester’s memory at the interval specified
in the Setup.

2 Press and hold again to exit the interval log mode.

60 U1452A/U1452AT/U1451A User’s Guide

Tester Features 3

NOTE

Recording Measurement Data (Log)

The maximum number of readings that can be stored for the interval log
is 100 entries. When all entries are occupied,

AFU will be shown when you

press and hold .

When the interval log recording session is running, all other keypad operations are
disabled; the exception is , which, when pressed for more than 1 second, will stop and
exit the recording session. Furthermore, APO (auto power-off) is disabled during the
recording session.

Performing event logs (TRIG)

Ensure that triG is selected as the Log option
in the Setup.

Event logs are used only with the following
modes:

• TrigHold and AutoHold (page 55)

• Earth- bond resistance tests (page 38)

• Insulation resistance tests (page 38)

• T/DAR/PI tests (page 30)

Event records are triggered by the measured signal satisfying a trigger
condition set by the measurement function used in the following modes:

Tab l e 3 - 3 Event log trigger conditions

Modes

Tr ig H o ld

AutoHold

Trigger condition

The input signal value is recorded:

Each time you press and the reading
update is stable.

When the input signal varies more than the
variation count and the reading update is stable.

Primary display recorded

Voltage, resistance, or
capacitance

Voltage, resistance, or
capacitance

Secondary display
recorded

Voltage, frequency,
capacitance cable length,
or output source voltage

Voltage, frequency,
capacitance cable length,
or output source voltage

U1452A/U1452AT/U1451A User’s Guide 61

3 Tester Features

NOTE

NOTE

Recording Measurement Data (Log)

Tab l e 3 - 3 Event log trigger conditions (continued)

Modes

Earth-bond
resistance test

Insulation
resistance test

T/Time

Trigger condition

The input signal value is recorded:

Each time you press to stop the test
output source.

When the time is up (Timer = 00:00), the final
value is recorded before the test output source
is stopped.

Primary display recorded

Resistance or
leak current value

Resistance or
leak current value

Secondary display
recorded

Test output source voltage

Test output source voltage

The values of DAR t30 (or DAR t15), DAR t60, PI t1, and PI t10 will be recorded in every IR
rotary switch location. For more information on DAR and PI tests, see page 35 and page 36
respectively.

Start the event log mode

1 Select one of the modes listed in Table 3- 3.

2 Press and hold to start event log mode.

and the log entry number are displayed. The primary display and
secondary display readings will be recorded into the memory.
Subsequent readings are automatically recorded into the tester’s
memory every time the trigger condition specified in Table 3- 3 is
satisfied.

3 Press and hold again to exit the event log mode.

The maximum number of readings that can be stored for the event log is
100 entries. When all entries are occupied,

EFU will be shown when you

press and hold .

APO (auto power-off) is disabled during the recording session.

62 U1452A/U1452AT/U1451A User’s Guide

Reviewing Previously Recorded Data (View)

CAUTION

Reviewing Previously Recorded Data (View)

Viewing data stored in the tester’s memory is
performed through the key.

1 Press and hold to View the

previously recorded data. Press again
to cycle through the manual (
(A), or event (E) records.

If nothing has been recorded, H--, A--, or

E-- will be displayed instead.

2 Select the desired recording category to view its entries.

i Press to jump to the first stored entry. Press to jump to

the last stored entry.

ii Press to view the next stored entry. The index number increases

by one. Press to view the previous stored entry. The index
number decreases by one.

iii Press to clear the last stored entry for the selected log type.

Press and hold to clear all entries for the selected log type.

3 Press and hold again to exit the View mode.

H), interval

Tester Features 3

U1452A/U1452AT/U1451A User’s Guide 63

Sanitizing the Log Memories

You have the option to sanitize the log
memories of your tester. This operation
erases the log memories of your tester
thoroughly. The data stored in the tester’s
memory will not be able to be reconstructed
in any way after the data sanitization
operation.

Prior to sanitizing the log memories, ensure
that all manual (
(see step iii). When all entries are cleared (H--, A--, and E--), press and
hold to sanitize the log memories.

H), interval (A), or event (E) records have been cleared

The data sanitization operation may take up to 30 seconds to complete. Do not press
any keys or turn the rotary switch until the data sanitization operation is completed.

3 Tester Features

Reviewing Previously Recorded Data (View)

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

64 U1452A/U1452AT/U1451A User’s Guide

U1452A/U1452AT/U1451A Insulation Tester
User’s Guide

4 Setup Options

Using the Setup Menu 66

Editing numerical values 67
Setup Menu Summary 68
Setup Menu Items 71

Editing numerical values 67

Changing the variation count 71

Enabling smooth mode 71

Changing the beep frequency 72

Changing the auto power-off (APO) timer 73

Changing the LCD backlight timeout 73

Changing the continuity alert 74

Disabling the power-on melody 75

Changing the battery type 75

Resetting the tester’s Setup options 76

Changing the display count 76

Changing the cable length unit 77

Changing the cable length scale 78

Changing the alert indicators 78

Changing the sample interval duration 79

Changing the recording option 80

Changing the IR and EBR test period 80

Changing the maximum inhibit voltage for IR tests 81

Disabling the lock once feature 82

Changing the button operation on the remote switch probe 82

Changing the Dielectric Absorption Ratio (DAR) for IR tests 83

The following sections describe how to change the preset
features of your tester.

4Setup Options

U1451A

U1452A/U1452AT

NOTE

Using the Setup Menu

Using the Setup Menu

The Setup menu allows you to change a number of nonvolatile preset
features. Modifying these settings affects the general operation of your
tester across several functions. Select a setting to edit in order to perform
one of the following actions:

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

• Cycle through multiple values from a predefined list.

• Decrease or increase a numerical value within a fixed range.

The contents of the Setup menu are summarized in Table 4- 2 on page 68.

Tab l e 4 - 1 Setup menu key functions

Legend Description

• Press for more than 1 second to access the Setup menu.

• Press and hold until the tester restarts to exit the Setup menu.

66 U1452A/U1452AT/U1451A User’s Guide

• Press or to browse each menu page.

• Press or at each menu page to move the cursor to a

specific menu item.

l‘

• Press to edit the selected menu item. The menu item’s value
will flash to indicate that you can now change the value shown.

• Press or again to switch between two values, to cycle
through multiple values from a list, or to decrease or increase a
numerical value.

• Press to save your changes.

• While the menu item’s value is flashing, press to discard

your changes.

The tester will automatically exit the Setup menu after 30 seconds of inactivity.

Setup Options 4

Press and hold for more than

1 second to enter the Setup menu.

Press to edit the

selected menu item’s value.

Press or to

move the cursor left or right.

Press or to increment
or decrement the selected digit.

Press again to

save the changes made.

Using the Setup Menu

Editing numerical values

When editing numerical values, use the and to position the
cursor on a numerical digit.

• Press to move the cursor to the left, and

• Press to move the cursor to the right.

When the cursor is positioned over a digit, use the and keys to
change the numerical digit.

• Press to increment the digit, and

• Press to decrement the digit.

When you have completed your changes, save the new numerical value by
pressing . (Or alternatively, if you wish to discard the changes you
made, press .)

U1452A/U1452AT/U1451A User’s Guide 67

4Setup Options

Setup Menu Summary

Setup Menu Summary

The Setup menu items are summarized in the table below. Click the
respective “Learn more” pages for more information on each menu item.

Tab l e 4 - 2 Setup menu item descriptions

Legend Available settings Description Learn more on:

AH

SMo

bEE

APo 01 to 99 minutes

bLt 01 to 99 seconds

tyP

Snd

0001 to 9999 counts

0001 to 9999

3200 Hz to 4267 Hz,

or oFF

SHor or tonE

MELo, USEr, bEEE, or

oFF

(d or E)

(d or E)

(d or E)

Set the AutoHold and Smooth threshold count from 1 to
9999 counts.

Default is 0050 counts.

Set the settling value from 0001 to 9999. You can also
disable this feature (d).

Default is disabled (0009

Set the beep frequency from 3200 Hz to
4267 Hz. You can also disable this feature (off).

Default is 3840 Hz.

Set the auto power-off timer period from 1 to 99 minutes
(1 hour, 39 minutes). You can also disable this feature (d).

Default is 15 minutes (15

Set the backlight timer period from 1 to 99 seconds
(1 minute, 39 seconds). You can also disable this feature
(d).

Default is 15 seconds (15
Set the tester to sound a single beep (SHor) or a tone

(tone) during continuity alerts for short circuits.
Default is a single beep for short circuits (SHor).

Set the power-on melody to the factory default (MELO),
a beep (bEEE), or disable this feature (off).

Default is a beep (bEEE).

).

d

).

E

).

E

page 71

page 71

page 72

page 73

page 73

page 74

page 75

Change the battery selection from primary (PRi) to

bAt PRi or SEC

rSt yES or no Reset the tester to its factory default settings. page 76

secondary (SEC).
Default is primary (PRi).

page 75

68 U1452A/U1452AT/U1451A User’s Guide

Setup Options 4

Setup Menu Summary

Tab l e 4 - 2 Setup menu item descriptions (continued)

Legend Available settings Description Learn more on:

Cnt Hi or Lo

CAb

mft

Mete (m) or Foot (ft)

CAb 01 to 99 nF/km

ALE

tiM

tyP

bE.rL, --.rL,

bE.--, or --.--

0001 to 9999 seconds

HAnd, AUto, or triG

tiM 00.05 to 59.59

inH 30 V, 50 V, or 75 V

mm:ss

Set the display count to High (Hi) or Low (Lo).
Default is Low (Lo).

Set the cable length unit to Meter (Mete) or Foot (Foot)
for capacitance measurements.

Default is Mete (m).

Set the capacitance measurement versus cable length
scale from 1 to 99 nF/km.

Default is 40 nF/km.

Set the tester to beep momentarily and light up the red
LED indicator for limit and continuity alerts. You can also
disable either or both alerts (off).

Default is to beep momentarily and light up the red LED
indicator (bE.rL).

Set the logging duration for interval logs from 1 to 9999
seconds (2 hours, 46 minutes, 39 seconds).

Default is 1 second.
Set the data logging option (HAnd: manual log,

AUto: interval log, or triG: event log).
Default is manual log (HAnd).

Set the insulation resistance or earth-bond resistance
test period.

Default is 10 seconds (00.10

mm:ss

)

Set the maximum inhibit voltage for insulation
resistance test.

Default is 30 V.

page 76

page 77

page 78

page 78

page 79

page 80

page 80

page 81

onE yES or no

Enable or disable the lock once feature.
Default is enabled (yES).

page 82

U1452A/U1452AT/U1451A User’s Guide 69

4Setup Options

Setup Menu Summary

Tab l e 4 - 2 Setup menu item descriptions (continued)

Legend Available settings Description Learn more on:

Change or disable the button operation on the remote

rEM bt-1 to bt-7

tiM

60.30 or 60.15 seconds

(d or E)

probe.
Default is (bt-7

Set the Dielectric Absorption Ratio in seconds (60:30 or
60:15).

Default is 60:30 (seconds).

).

E

page 82

page 83

70 U1452A/U1452AT/U1451A User’s Guide

Setup Menu Items

Changing the variation count

This setting is used with the AutoHold feature (see page 55). When the
variation of the measured value exceeds the value of the variation count,
the AutoHold feature will be ready to trigger.

Legend Range Default setting

AH (0001 to 9999) counts 0050

To change the variation count:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

3 Use the arrow keys to change the variation count.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Setup Options 4

Setup Menu Items

AH ( and are shown on the display), and press

to edit the value.

Enabling smooth mode

Smooth is used to smoothen the refresh rate of the readings in order to
reduce the impact of unexpected noise and to help you achieve a stable
reading.

The smooth refresh rate can be set from 0001 to 9999. The smooth time is
defined as the set value +1. Smooth will be restarted when the variation
count is exceeded, when the range is changed, or after a tester function or
feature is enabled. The variation count is set to the value used for the
AutoHold feature (see “Changing the variation count” on page 71).

U1452A/U1452AT/U1451A User’s Guide 71

4Setup Options

Setup Menu Items

Legend Range Default setting

SMo • 0001 to 9999

• d(isabled) or E(nabled)

0009

d

To change the smooth refresh rate:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

SMo ( is shown on the display), and press to edit

the value.

3 Use the arrow keys to change the smooth refresh rate. Select E to

enable the Smooth feature.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Changing the beep frequency

The beeper alerts users to the presence of circuit continuities and newly
sensed values for Max Min recordings.

Legend Range Default setting

bEE (4267, 4151, 4042, 3938, 3840, 3746, 3675, 3572, 3491,

3413, 3339, 3268, 3200) Hz, or oFF

3840

To change the beep frequency:

1 Press for more than 1 second to enter the Setup menu.
2 Browse to bEE, and press to edit the value.
3 Use the arrow keys to change the beep frequency. Select oFF to disable

the beeper.

4 Press to save your changes (or press to discard your

changes).

72 U1452A/U1452AT/U1451A User’s Guide

Setup Options 4

Setup Menu Items

5 Press and hold until the tester restarts to return to normal

operation.

Changing the auto power-off (APO) timer

The APO (see page 6) feature uses a timer to determine when to
automatically turn the tester off.

Legend Range Default setting

APo • (01 to 99) minutes

• E(nabled) or d(isabled)

15

E

To change the APO timer period:

1 Press for more than 1 second to enter the Setup menu.
2 Browse to APo, and press to edit the value.
3 Use the arrow keys to change the APO timer period. Select d to disable

the APO feature.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Changing the LCD backlight timeout

The tester’s LCD backlight uses a timer to determine when to turn off the
LCD backlight.

Legend Range Default setting

bLT • (01 to 99) seconds

• E(nabled) or d(isabled)

15

E

U1452A/U1452AT/U1451A User’s Guide 73

4Setup Options

Setup Menu Items

To change the LCD backlight timer period:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to
3 Use the arrow keys to change the backlight timer period. Select d to

disable the backlight timer.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

bLT, and press to edit the value.

Changing the continuity alert

This setting is used with continuity tests (see page 48). The tester will
beep to alert users to the presence of circuit continuities for short
circuits. If tone is selected, the tester will sound different tones according
to the bar graph display.

Legend Range Default setting

tyP SHor(t) or tonE SHor

To change the continuity alert:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

value.

3 Use the arrow keys to change the continuity alert.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

74 U1452A/U1452AT/U1451A User’s Guide

tyP ( is shown on the display), and press to edit the

Setup Options 4

NOTE

Setup Menu Items

Disabling the power-on melody

The tester plays a melody or a beep when it is powered on.

Legend Range Default setting

Snd MELo(dy), USEr, bEEE, or oFF bEEE

To disable the power- on melody:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to
3 Use the arrow keys to change the power- on melody. Select oFF to

disable the power- on melody.

The USEr option is for Keysight internal use.

Snd, and press to edit the value.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Changing the battery type

If you are using rechargeable batteries to power your tester, change the
battery type from PRi to SEC for the tester to accurately reflect the battery
capacity indication.

Legend Range Default setting

bAt PRi(mary) or SEC(ondary) PRi

U1452A/U1452AT/U1451A User’s Guide 75

4Setup Options

Setup Menu Items

To change the battery type:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

3 Use the arrow keys to change the battery type.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

bAt, and press to edit the value.

Resetting the tester’s Setup options

The tester’s Setup options can be reset to its default values through the
Setup menu.

Legend Range Default setting

rSt yES or no no

1 Press for more than 1 second to enter the Setup menu.

2 Browse to
3 Use the arrow keys to select yES.

4 Press and hold for more than 1 second to perform the reset. The

tester will beep once and return to the first Setup menu page. Or,
alternatively press to discard your changes.

rSt, and press to edit the value.

Changing the display count

Use these settings to change the display count for the following
measurements/tests. The low resolution count is a tenth of the original
display count. As an example, if the original display count is 6000 counts,
then the low resolution display count is 600 counts.

76 U1452A/U1452AT/U1451A User’s Guide

Setup Options 4

NOTE

Setup Menu Items

Legend Range Default setting

Cnt Hi(gh) or Lo(w) Lo

• Voltage and capacitance measurements are fixed at 6000 counts.

• DAR and PI tests are fixed at 9999 counts.

To change the display count:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

Cnt, and press to edit the value.

3 Use the arrow keys to change the display count.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Changing the cable length unit

This setting is used with capacitance measurements (see page 50). Change
the unit (Meter or Feet) of the cable length display.

Legend Range Default setting

CAb

mft

To change the cable length unit:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

3 Use the arrow keys to change the cable length unit.

U1452A/U1452AT/U1451A User’s Guide 77

Mete(r) or Foot Mete

CAb

, and press to edit the value.

mft

4Setup Options

Setup Menu Items

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

Changing the cable length scale

This setting is used with capacitance measurements (see page 50). Change
the scale from 1 nF to 99 nF per kilometer for capacitance transfers to
cable length.

Legend Range Default setting

CAb (01 to 99) nF 40

To change the cable length scale:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

3 Use the arrow keys to change the cable length scale.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

CAb, and press to edit the value.

Changing the alert indicators

The tester’s audible and visual alerts users to the presence of circuit
continuities (see page 48) and values exceeding the Limit values set (see

page 48).

Legend Range Default setting

ALE bE.rL, --.rL, bE.--, or --.-- bE.rL

78 U1452A/U1452AT/U1451A User’s Guide

Setup Options 4

Setup Menu Items

To change the alert indicators:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

to edit the value.

3 Use the arrow keys to change the alert indicators. Select

either the beeper, the red LED, or both the alert indicators.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

ALE ( and is shown on the display), and press

-- to disable

Changing the sample interval duration

This setting is used with the Interval Data Logging feature (see page 60).
The tester will record a measurement value at the beginning of every
sample interval.

Legend Range Default setting

tiM (0001 to 9999) seconds 0001

To change the sample interval duration:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

the value.

3 Use the arrow keys to change the sample interval duration.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

U1452A/U1452AT/U1451A User’s Guide 79

tiM ( is shown on the display), and press to edit

4Setup Options

Setup Menu Items

Changing the recording option

This setting is used with the Data Logging feature (see page 59). There are
three available recording options for the Data Logging feature.

• HAnd: Manual log

• AUto: Interval log

• triG: Event log

Legend Range Default setting

tyP HAnd, auTO, or triG HAnd

To change the recording option:

1 Press for more than 1 second to enter the Setup menu.

2 Browse to

the value.

3 Use the arrow keys to change the recording option.

4 Press to save your changes (or press to discard your

changes).

5 Press and hold until the tester restarts to return to normal

operation.

tyP ( is shown on the display), and press to edit

Changing the IR and EBR test period

This setting is used with insulation resistance tests (see page 38) or
earth- bond resistance measurements (see page 38). The tester performs
the test over the timed period defined in this setting.

Legend Range Default setting

tiM (00.05 to 59.59) mm:ss 00.10

80 U1452A/U1452AT/U1451A User’s Guide