Page 1
Keysight U1190A Series
Handheld Clamp Meters
User’s Guide
Page 2
Notices
CAUTION
WARNING
Copyright Notice
© Keysight Technologies 2011 - 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
U1191-90003
Edition
Edition 8, June 1, 2017
Printed in:
Printed in Malaysia
Published by:
Keysight Technologies
Bayan Lepas Free Industrial Zone,
11900 Penang, Malaysia
Technology Licenses
The hard ware and/or software
described in this document are
furnished under a license and may be
used or copied only in accordance with
the terms of such license.
Declaration of Conformity
Declarations of Conformity for this
product and for other Keysight
products may be downloaded from the
Web. Go to http://www.keysight.com/
go/conformity. You can then search by
product number to find the latest
Declaration of Conformity.
U.S. Government Rights
The Software is “commercial computer
software,” as defined by Federal
Acquisition Regulation (“FAR”) 2.101.
Pursuant to FAR 12.212 and 27.405-3
and Department of Defense FAR
Supplement (“DFARS”) 227.7202, the
U.S. government acquires commercial
computer software under the same
terms by which the software is
customarily provided to the public.
Accordingly, Keysight provides the
Software to U.S. government
customers under its standard
commercial license, which is embodied
in its End User License Agreement
(EULA), a copy of which can be found
at http://www.keysight.com/find/
sweula. The license set forth in the
EULA represents the exclusive authority
by which the U.S. government may use,
modify, distribute, or disclose the
Software. The EULA and the license set
forth therein, does not require or
permit, among other things, that
Keysight: (1) Furnish technical
information related to commercial
computer software or commercial
computer software documentation that
is not customarily provided to the
public; or (2) Relinquish to, or
otherwise provide, the government
rights in excess of these rights
customarily provided to the public to
use, modify, reproduce, release,
perform, display, or disclose
commercial computer software or
commercial computer software
documentation. No additional
government requirements beyond
those set forth in the EULA shall apply,
except to the extent that those terms,
rights, or licenses are explicitly required
from all providers of commercial
computer software pursuant to the FAR
and the DFARS and are set forth
specifically in writing elsewhere in the
EULA. Keysight shall be under no
obligation to update, revise or
otherwise modify the Software. With
respect to any technical data as
defined by FAR 2.101, pursuant to FAR
12.211 and 27.404.2 and DFARS
227.7102, the U.S. government
acquires no greater than Limited Rights
as defined in FAR 27.401 or DFAR
227.7103-5 (c), as applicable in any
technical data.
Warranty
THE MATERIAL CONTAINED IN THIS
DOCUMENT IS PROVIDED “AS IS,”
AND IS SUBJECT TO BEING
CHANGED, WITHOUT NOTICE, IN
FUTURE EDITIONS. FURTHER, TO THE
MAXIMUM EXTENT PERMITTED BY
APPLICABLE LAW, KEYSIGHT
DISCLAIMS ALL WARRANTIES, EITHER
EXPRESS OR IMPLIED, WITH REGARD
TO THIS MANUAL AND ANY
INFORMATION CONTAINED HEREIN,
INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. KEYSIGHT
SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES IN
CONNECTION WITH THE
FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT
OR OF ANY INFORMATION
CONTAINED HEREIN. SHOULD
KEYSIGHT AND THE USER HAVE A
SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS COVERING
THE MATERIAL IN THIS DOCUMENT
THAT CONFLICT WITH THESE TERMS,
THE WARRANTY TERMS IN THE
SEPARATE AGREEMENT SHALL
CONTROL.
Safety Information
A CAUTION notice denotes a hazard. It
calls attention to an operating
procedure, practice, or the like that, if
not correctly performed or adhered to,
could result in damage to the product
or loss of important data. Do not
proceed beyond a CAUTION notice
until the indicated conditions are fully
understood and met.
A WARNING notice denotes a hazard. It
calls attention to an operating
procedure, practice, or the like that, if
not correctly performed or adhered to,
could result in personal injury or death.
Do not proceed beyond a WARNING
notice until the indicated conditions are
fully understood and met.
2 Keysight U1190A Series User’s Guide
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Safety Symbols
400 A
MAX
600 A
MAX
CAT III
600 V
CAT IV
300 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)
Alternating current (AC)
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Application around and removal from
HAZARDOUS LIVE conductors is
permitted
Both direct and alternating current
Earth (ground) terminal
Equipment protected throughout by
double insulation or reinforced
insulation
Caution, risk of electric shock
U1191A/U1192A: Maximum allowable
current measurement is 400 A
U1193A/U1194A: Maximum allowable
current measurement is 600 A
Category III 600 V overvoltage
protection
Category IV 300 V overvoltage
protection
Keysight U1190A Series User’s Guide 3
Page 4
Safety Considerations
CAUTION
WARNING
Read the information below before using this instrument.
The following general safety precautions must be observed during all phases of
operation, service, and repair of this instrument. Failure to comply with these
precautions or with specific warnings elsewhere in this manual violates safety
standards for design, manufacture, and intended use of the instrument. Keysight
Technologies assumes no liability for the customer’s failure to comply with these
requirements.
– 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.
– Never measure voltage when current measurement is selected.
– Always use the specified battery type. The power for the meter is
supplied with two standard AAA 1.5 V batteries. Observe the correct
polarity markings before you insert the batteries to ensure proper
insertion of the batteries in the meter.
– You are advised to use low leakage batteries when changing to new
batteries. Please remember to remove the batteries when the meter is not
in use for a long period of time. Warning on the risk of battery leakage.
– Do not exceed any of the measurement limits defined in the specifications
to avoid instrument damage and the risk of electric shock.
– Do not use the meter if it is damaged. Before you use the meter, 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 meter.
4 Keysight U1190A Series User’s Guide
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WARNING
– Do not operate the meter around explosive gas, vapor, or wet
environments.
– Do not apply more than the rated voltage and current (as marked on the
meter) between the terminals or between the terminal and the earth
ground.
– Never use the meter in wet conditions or when there is water on the
surface. If the meter is wet, ensure that the meter is dried only by trained
personnel.
– Before use, verify the meter’s operation by measuring a known voltage.
Use caution when working above 60 V DC, 30 V AC RMS, or 42.4 V peak.
Such voltages pose a shock hazard.
– When measuring current, turn off the circuit power before connecting the
meter in the circuit. Remember to place the meter in series with the
circuit.
– When measuring temperature, keep the thermocouple probe as close to
the meter as possible, and avoid contact with surfaces above 60 V DC,
30 V AC RMS, or 42.4 V peak. Such voltages pose a shock hazard.
– When servicing the meter, use only the specified replacement parts.
– When using the probes, keep your fingers behind the finger guards on the
probes.
Keysight U1190A Series User’s Guide 5
– 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 meter before you open the battery cover.
Do not operate the meter 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.
Page 6
WARNING
– Use the meter only as specified in this guide. Otherwise, the protection
provided by the meter may be impaired.
– Individual protective equipment must be used if hazardous live parts in
the installation are accessible where measurement is to be carried out.
– The tactile indicator or barrier, indicates the limit of safe access of the
handheld part.
6 Keysight U1190A Series User’s Guide
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Measurement Category
The Keysight U1190A Series Handheld Clamp Meters have a safety rating of CAT
III, 600 V and CAT IV, 300 V.
Measurement CAT I are for measurements performed on circuits not directly
connected to the AC mains. Examples are measurements on circuits not derived
from the AC mains and specially protected (internal) mains-derived circuits.
Measurement CAT II are measurements performed on circuits directly
connected to a low-voltage installation. Examples are measurements on
household appliances, portable tools, and similar equipment.
Measurement CAT III are measurements performed in building installations.
Examples are measurements on distribution boards, circuit-breakers, wiring,
including cables, bus-bars, junction boxes, switches, socket outlets in the fixed
installation, and equipment for industrial use, and some other equipment
including stationary motors with permanent connection to the fixed installation.
Measurement CAT IV are measurements performed at the source of
low-voltage installations. Examples are electricity meters and measurements on
primary over current protection devices and ripple control units.
Keysight U1190A Series User’s Guide 7
Page 8
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 conditions Requirements
Operating temperature –10 °C to 50 °C
Operating humidity
Storage temperature –40 °C to 60 °C, 40% to 80% RH (without batteries)
Altitude Up to 2000 meters
Pollution degree Pollution degree 2
The U1190A Series Handheld Clamp Meter complies with the following safety
and EMC requirements:
– IEC 61010-1:2001/EN 61010-1:2001
– IEC 61010-2-032:2002/EN 61010-2-032:2002
– CAN/CSA-C22.2 No. 61010-1-04
– CAN/CSA-C22.2 No. 61010-2-032-04
Up to 80% RH (relative humidity) for temperature up to 30 °C,
decreasing linearly to 50% RH at 50 °C
– ANSI/UL Std. No. 61010-1:2004
– IEC61326-1:2005/EN61326-1:2006
– Canada: ICES/NMB-001: Issue 4, June 2006
– Australia/New Zealand: AS/NZS CISPR 11:2004
8 Keysight U1190A Series User’s Guide
Page 9
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 Australian
Communications and Media Authority.
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.
Keysight U1190A Series User’s Guide 9
Page 10
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/ 96/EC
This instrument complies with the WEEE Directive (2002/96/EC) marking
requirement. This affixed product label indicates that you must not discard this
electrical or electronic product in domestic household waste.
Product category:
With reference to the equipment types in the WEEE directive Annex 1, this
instrument is classified as a “Monitoring and Control Instrument” product.
The affixed product label is as shown below.
Do not dispose in domestic household waste.
To return this unwanted instrument, contact your nearest Keysight Service Center,
or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml
for more information.
Sales and Technical Support
To contact Keysight for sales and technical support, refer to the support links on
the following Keysight websites:
– www.keysight.com/find/handhelddmm
(product-specific information and support, software and
documentation updates)
– www.keysight.com/find/assist
(worldwide contact information for repair and service)
10 Keysight U1190A Series User’s Guide
Page 11
Table of Contents
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Measurement Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
1Introduction
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Documentation map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Preparing Your Clamp Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Checking the shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Installing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Turning on your clamp meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Automatic Power-Off (APO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Enabling the backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Enabling the flashlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Alerts and warnings during measurement . . . . . . . . . . . . . . . . . . . .25
Power-on options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Your Clamp Meter in Brief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Rotary switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Display screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Input terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Cleaning Your Clamp Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Keysight U1190A Series User’s Guide 11
Page 12
2Making Measurements
Measuring AC or DC Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Measuring AC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Measuring DC Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Measuring Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Testing for Continuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Testing Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Measuring Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Measuring Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Measuring AC or DC Current (up to µA) . . . . . . . . . . . . . . . . . . . . . . . . 62
Measuring Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3Clamp Meter Features
Detecting AC Voltage Presence (Vsense) . . . . . . . . . . . . . . . . . . . . . . . 68
Making Relative Measurements (Null) . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Capturing Maximum and Minimum Values (Max.Min) . . . . . . . . . . . . . 72
Freezing the Display (Hold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4Characteristics and Specifications
12 Keysight U1190A Series User’s Guide
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List of Figures
Figure 1-1 Installing the batteries . . . . . . . . . . . . . . . . . . . . . . . . .20
Figure 1-2 Powering on the clamp meter . . . . . . . . . . . . . . . . . . .22
Figure 1-3 Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Figure 1-4 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 2-1 AC current display . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 2-2 Measuring AC current . . . . . . . . . . . . . . . . . . . . . . . . .41
Figure 2-3 Wire separator and hook design . . . . . . . . . . . . . . . . .42
Figure 2-4 AC voltage display . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Figure 2-5 Measuring AC voltage . . . . . . . . . . . . . . . . . . . . . . . . .45
Figure 2-6 DC voltage display . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Figure 2-7 Measuring DC voltage . . . . . . . . . . . . . . . . . . . . . . . . .47
Figure 2-8 Resistance display . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Figure 2-9 Measuring resistance . . . . . . . . . . . . . . . . . . . . . . . . . .49
Figure 2-10 Open continuity display . . . . . . . . . . . . . . . . . . . . . . . .50
Figure 2-11 Closed continuity display . . . . . . . . . . . . . . . . . . . . . . .50
Figure 2-12 Testing for continuity . . . . . . . . . . . . . . . . . . . . . . . . . .52
Figure 2-13 Diode display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Figure 2-14 Open diode display . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Figure 2-15 Testing forward-bias diode . . . . . . . . . . . . . . . . . . . . .55
Figure 2-16 Testing reverse-bias diode . . . . . . . . . . . . . . . . . . . . . .56
Figure 2-17 Capacitance display . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Figure 2-18 Measuring capacitance . . . . . . . . . . . . . . . . . . . . . . . .58
Figure 2-19 Temperature display . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Figure 2-20 Measuring the surface temperature . . . . . . . . . . . . . .61
Figure 2-21 DC current display . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Figure 2-22 Measuring AC/DC current (up to µA) . . . . . . . . . . . . .63
Figure 2-23 Frequency display . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 2-24 Measuring frequency . . . . . . . . . . . . . . . . . . . . . . . . . .65
Figure 3-1 Vsense (high sensitivity) display . . . . . . . . . . . . . . . . .69
Figure 3-2 Vsense (low sensitivity) display . . . . . . . . . . . . . . . . . .69
Figure 3-3 Detecting voltage presence . . . . . . . . . . . . . . . . . . . . .70
Figure 3-4 Null display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Figure 3-5 Max.Min display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Figure 3-6 Hold display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Keysight U1190A Series User’s Guide 13
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14 Keysight U1190A Series User’s Guide
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List of Tables
Table 1-1 Battery level indicator . . . . . . . . . . . . . . . . . . . . . . . . .21
Table 1-2 Power-on options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Table 1-3 Rotary switch functions . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 1-4 Keypad functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Table 1-5 General annunciators . . . . . . . . . . . . . . . . . . . . . . . . . .34
Table 1-6 Measurement units display . . . . . . . . . . . . . . . . . . . . .35
Table 1-7 Terminal connections for different measuring
functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
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16 Keysight U1190A Series User’s Guide
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Keysight U1190A Series Handheld Clamp Meters
User’s Guide
1 Introduction
About This Manual 18
Preparing Your Clamp Meter 19
Your Clamp Meter in Brief 27
Cleaning Your Clamp Meter 38
This chapter teaches you how to set up your clamp meter for the first time. An
introduction to all the features of the clamp meter is also given.
17
Page 18
1Introduction
About This Manual
The descriptions and instructions in this manual apply to the Keysight U1191A,
U1192A, U1193A, and U1194A handheld clamp meters (hereafter referred to as
the clamp meter).
The model U1194A appears in all illustrations.
Documentation map
The following manuals and software are available for your clamp meter. For the
very latest version, please visit our website at: http://www.keysight.com/find/
hhTechLib.
Check the manual revision 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. Free download at the Keysight website.
Safety notes
Safety notes are used throughout this manual (see the Safety Information section
for format examples). Familiarize yourself with each of the notes and its meaning
before operating your clamp meter.
More pertinent safety notes for using this product are located under the Safety
Considerations section.
Do not proceed beyond a safety notice until the indicated conditions are fully
understood and met.
18 Keysight U1190A Series User’s Guide
Page 19
Preparing Your Clamp Meter
CAUTION
Checking the shipment
When you receive your clamp meter, 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
clamp meter 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
U1190A Series Quick Start Guide.
3 For any question or problems, refer to the Keysight contact numbers on the
back of this manual.
Installing the batteries
Introduction 1
Your clamp meter is powered by two 1.5 V AAA alkaline batteries (included with
the shipment). When you receive your clamp meter, the AAA alkaline batteries are
not installed.
Use the following procedure to install 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 OFF
position. Use only the battery type specified in the Chapter 4,
“Characteristics and Specifications”.
Keysight U1190A Series User’s Guide 19
Page 20
1Introduction
1 Open the battery cover. Loosen the screw with a suitable Phillips screwdriver
and remove the battery cover as shown in Figure 1-1.
2 Insert the batteries. Observe the proper battery polarity. The terminal ends of
each battery are indicated inside the battery compartment.
3 Close the battery cover. Place the battery cover back in its original position
and tighten the screw.
Figure 1-1 Installing the batteries
The battery level indicator in the lower left-hand corner of the display indicates
the relative condition of the batteries. Table 1-1 describes the various battery
levels the indicator represents.
20 Keysight U1190A Series User’s Guide
Page 21
Tab le 1-1 Battery level indicator
WARNING
CAUTION
Indication Battery capacity
Introduction 1
Full capacity
2/3 capacity
1/3 capacity
(Flashing periodically)
[a] Batteries change advised. Always use the specified battery type listed in the Chapter 4, “Characteristics and Specifications”.
Almost empty
[a]
To avoid false readings, which could lead to possible electric shock or
personal injury, replace the batteries as soon as the low battery indicator
appears. Do not discharge the batteries by shorting the batteries or
reversing the polarity of the batteries.
To avoid instruments being damage from battery leakage:
– Always remove dead batteries immediately.
– Always remove the batteries and store them separately if the clamp
meter is not going to be used for a long period.
Keysight U1190A Series User’s Guide 21
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1Introduction
Turning on your clamp meter
To power ON your clamp meter, turn the rotary switch from the OFF position to
any other position.
Figure 1-2 Powering on the clamp meter
To power OFF your clamp meter, turn the rotary switch to the OFF position.
22 Keysight U1190A Series User’s Guide
Page 23
Automatic Power-Off (APO)
NOTE
Your clamp meter automatically turns off if the rotary switch is not moved or a key
is not pressed for 15 minutes (default). The clamp meter will beep thrice before it
powers off. Pressing any key or turning the rotary switch to a new position will turn
the clamp meter back on after it is powered off automatically.
The symbol is shown on the bottom left of the display when the automatic
power-off function is enabled.
Follow the steps below to change the timer period or completely disable the
automatic power-off.
1 Press and hold while powering on the clamp meter to enter the Setup
menu.
2 The automatic power-off (A #) timer period is the first Setup item shown.
3 Press to make changes to the A # value.
Press or to change the timer period (from A 01 to A 99 minutes) or to
completely disable the automatic power-off function (AoFF).
4 Press to save the changes, or press to discard the changes and
proceed to the next Setup item.
Introduction 1
5 Cycle the clamp meter’s power to exit the Setup menu.
Enabling the backlight
If viewing the display becomes difficult in low-light conditions, press (on the
U1192A/U1193A/U1194A models) or (on the U1191A model) to activate the
LCD backlight.
Press / again to deactivate the LCD backlight.
To conserve battery life, a user-adjustable timer controls how long the backlight
stays on. The default timer period is 15 seconds.
Keysight U1190A Series User’s Guide 23
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1Introduction
WARNING
NOTE
Follow the steps below to change the timer period or completely disable the
backlight timer.
1 Press and hold while powering on the clamp meter to enter the Setup
menu.
2 Press again. The backlight (b #) timer period is the second Setup item
shown.
3 Press to make changes to the b # value.
Press or to change the timer period (from b 01 to b 99 seconds) or to
completely disable the backlight timer function (boFF).
4 Press to save the changes, or press to discard the changes and
proceed to the next Setup item.
5 Cycle the clamp meter’s power to exit the Setup menu.
Enabling the flashlight
This feature is applicable for U1192A, U1193A, and U1194A models only.
If you are using the clamp meter in dark places, press and hold for more than
1 second to activate the LED flashlight for greater visibility on your test points.
This is not applicable to the U1191A model.
Press for more than 1 second to deactivate the LED flashlight.
VISION ADVISORY CLAIM
It is advised that you do not look directly into the light source of the LED
flashlight. As with any source of bright light, prolonged exposure can
damage the eye.
To conserve battery life, a user-adjustable timer can be set to control how long
the flashlight stays on. This function is disabled by default.
24 Keysight U1190A Series User’s Guide
Page 25
Follow the steps below to change the timer period or completely disable the
WARNING
flashlight timer.
1 Press and hold while powering on the clamp meter to enter the Setup
menu.
2 Press twice. The flashlight (t #) timer period is the third Setup item shown.
3 Press to make changes to the t # value.
Press or to change the timer period (from t 01 to t 99 seconds) or to
completely disable the flashlight timer function (toFF).
4 Press to save the changes, or press to discard the changes and
proceed to the next Setup item.
5 Cycle the clamp meter’s power to exit the Setup menu.
Alerts and warnings during measurement
Voltage alert
For your own safety, please do not ignore the voltage alert. When the clamp
meter cautions you with a voltage alert, you are advised to take note of the
existence of high voltage and pay closer attention when performing
measurements.
Introduction 1
Keysight U1190A Series User’s Guide 25
Your clamp meter provides a voltage alert for voltage measurements. The clamp
meter starts beeping periodically once the measured voltage exceeds the alert
value (regardless of polarity) set.
Hazardous voltage indication
The clamp meter will also display the hazardous voltage ( ) symbol as an early
precaution when the measured voltage is equal to or greater than 30 V in all
voltage measurement modes.
Page 26
1Introduction
+
Power-on options
Some options can be selected only while you turn the clamp meter on. These
power-on options are listed in the table below.
To select a power-on option, press and hold the specified key in Table 1-2 while
turning the rotary switch from the OFF position to any other position.
Tab le 1-2 Power-on options
Key Description
Tests the LCD.
All annunciators are displayed in the LCD for 10 seconds. Cycle the clamp meter’s power
to exit this mode, or wait 10 seconds for the clamp meter to return to normal operation.
Checks the firmware version.
The clamp meter’s firmware version will be shown on the primary display. Cycle the
clamp meter’s power to exit this mode.
Enters the clamp meter’s Setup menu.
See the following topics for more information on each respective Setup menu item.
– “Automatic Power-Off (APO)” on page 23
– “Enabling the backlight” on page 23
– “Enabling the flashlight” on page 24
– “Changing the continuity visual alert” on page 51
Cycle the clamp meter’s power to exit the Setup menu.
Enters the unit selection menu for temperature measurements (U1194A only).
See “Changing the default temperature unit” on page 60 for more information. Cycle the
clamp meter’s power to exit this menu.
26 Keysight U1190A Series User’s Guide
Page 27
Your Clamp Meter in Brief
77.14 mm
77.14 mm
Dimensions
Front view
Introduction 1
Keysight U1190A Series User’s Guide 27
Page 28
1Introduction
225 mm
238 mm
Rear view
28 Keysight U1190A Series User’s Guide
Page 29
Overview
Clamp jaw
Hold/MaxMin button
Rotary switch
Display screen
Function buttons
Input terminals
Jaw markings
Front panel
The front panel parts of your clamp meter are described in this section.
Introduction 1
Figure 1-3 Front panel
Keysight U1190A Series User’s Guide 29
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1Introduction
Flashlight
Hand guard
Handle
Battery cover
Rear panel
The rear panel parts of your clamp meter are described in this section.
Figure 1-4 Rear panel
30 Keysight U1190A Series User’s Guide
Page 31
Rotary switch
NOTE
WARNING
NOTE
The measurement functions for each rotary switch position are described in
Table 1-3 on page 32. Turning the rotary switch changes the measurement
function and resets all other measurement options.
Some rotary switch positions have a shifted function printed in orange. Press
to switch between the shifted and primary function.
Remove the test leads from the measuring source or target before changing
the rotary switch position.
Each position of the U1191A, U1192A, U1193A, and U1194A rotary switches
(shown in Figure 1-3) is described in Tab le 1- 3. Click the respective “Learn more”
pages for more information on each function.
A list of some of the abbreviations used in Table 1-3 is given below.
– AC A: AC current measurement
Introduction 1
Keysight U1190A Series User’s Guide 31
– DC A: DC current measurement
– AC V: AC voltage measurement
– DC V: DC voltage measurement
– AC μA: AC current measurement (up to microamperes)
– DC μA: DC current measurement (up to microamperes)
Page 32
1Introduction
Tab le 1-3 Rotary switch functions
Legend Functions shown in the primary d isplay U1194A U1193A U1192A U1191A Learn more on:
Off 4444 page 22
AC A 4444
DC A 4 ---
Frequency (current path) 444 - page 64
AC V 4444 page 44
Frequency (voltage path) 444 - page 64
DC V 4444 page 46
Resistance 4444 page 48
Continuity 4444 page 50
Diode 4444 page 53
Capacitance 444 - page 57
Non-contact voltage detector 444 - page 68
Temperature 4 ---page 59
DC μA 4 ---
AC μA 4 ---
page 40
page 62
32 Keysight U1190A Series User’s Guide
Page 33
Keypad
The operation of each key is explained 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.
Click the respective “Learn more” pages for more information on each function.
Tab le 1-4 Keypad functions
Introduction 1
Legend
Function when pressed for:
Less than 1 second More than 1 second
Freezes the present reading in the display.
Switches between the primary and shifted
(icons printed in orange) functions.
Turns the LCD backlight on or off. Turns the LED flashlight on or off.
U1191A only:
Turns the LCD backlight on or off.
Sets the null/relative mode. - page 71
Records the maximum, minimum, or average
value.
- page 31
- page 23
Learn more on:
page 74
page 23
and
page 24
Keysight U1190A Series User’s Guide 33
Page 34
1Introduction
Display screen
The display annunciators of your clamp meter are described in this section. See
also “Measurement units” on page 35 for a list of available measurement signs
and notations.
General display annunciators
The general display annunciators of your clamp meter are described in the table
below.
Tab le 1-5 General annunciators
Legend Description Learn more on:
Hazardous voltage sign for measuring voltage ≥30 V or overload page 25
Hold enabled page 74
Auto-ranging enabled -
Maximum reading shown on primary display
Minimum reading shown on primary display
Averaged reading shown on primary display
Present reading shown on primary display
Relative (Null) enabled page 71
Diode test selected page 53
Audible continuity test selected page 50
DC (direct current) indication
AC (alternating current) indication
Battery capacity indication page 21
APO (Auto Power-Off) enabled page 23
page 72
page 40
and page 46
page 40
and page 44
34 Keysight U1190A Series User’s Guide
Page 35
Tab le 1-5 General annunciators (continued)
Legend Description Learn more on:
Primary measurement display -
Measuring units page 35
Overload (the reading exceeds the display range) -
Measurement units
The available signs and notations for each measurement function in your clamp
meter are described in Tab le 1-6. The units listed below are applicable to the
primary display measurements of your clamp meter.
Tab le 1-6 Measurement units display
Sign/Notation Description
M Mega 1E+06 (1000000)
Introduction 1
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
μA, mA, A Ampere units for current measurement
nF, μF, mF Farad units for capacitance measurement
Ω, kΩ, MΩ Ohm units for resistance measurement
Hz, kHz, MHz Hertz units for frequency measurement
°C Degree Celsius, unit for temperature measurement
°F Degree Fahrenheit, unit for temperature measurement
Keysight U1190A Series User’s Guide 35
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1Introduction
WARNING
CAUTION
Input terminals
The terminal connections for the different measurement functions of your clamp
meter are described in the table below. Observe the rotary switch position of your
clamp meter before connecting the test leads to the connector terminals.
Ensure that the probe accessories are connected to the correct input
terminals for the selected measurement function before starting any
measurement.
To avoid damaging this device, do not exceed the rated input limit.
Tab le 1-7 Terminal connections for different measuring functions
Legend Functions U1194A U1193A U1192A U1191A Input terminals Overload protection
AC V 4444
Frequency
(voltage path)
444 -
600 Vrms
DC V 4444
Diode 4444
Capacitance 444 -
Resistance 4444
Continuity 4444
Non-contact
voltage detector
Temperature 4 ---
DC μA 4 ---
AC μA 4 ---
444 -
600 Vrms for short
circuit current <0.3 A
CAT III 600 V
36 Keysight U1190A Series User’s Guide
Page 37
Introduction 1
Tab le 1-7 Terminal connections for different measuring functions (continued)
Legend Functions U1194A U1193A U1192A U1191A Input terminals Overload protection
AC A 4444
DC A 4 ---
600 Arms
Frequency
(current path)
444 -
Keysight U1190A Series User’s Guide 37
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1Introduction
WARNING
Cleaning Your Clamp Meter
To avoid electrical shock or damage to the clamp meter, 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 clamp meter.
1 Turn the clamp meter off, and remove the test leads.
2 Turn the clamp meter over, and shake out any dirt that may have accumulated
in the terminals.
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.
38 Keysight U1190A Series User’s Guide
Page 39
Keysight U1190A Series Handheld Clamp Meters
User’s Guide
2 Making Measurements
Measuring AC or DC Current 40
Measuring AC Voltage 44
Measuring DC Voltage 46
Measuring Resistance 48
Testing for Continuity 50
Testing Diodes 53
Measuring Capacitance 57
Measuring Temperature 59
Measuring AC or DC Current (up to µA) 62
Measuring Frequency 64
This chapter describes how to take measurements with your clamp meter.
39
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2 Making Measurements
WARNING
CAUTION
Current
flow
Current
flow
For best accuracy
during current
measurements,
align the cable with
the jaw markings.
Correct Incorrect
4 8
NOTE
Measuring AC or DC Current
Ensure that the test leads are disconnected from the input terminals when
measuring current with the clamp jaws.
Ensure that the clamp meter measures only one conductor at a time.
Measuring multiple conductors may cause inaccuracy in measurement
readings due to the vector sum of currents flowing in the conductors.
40 Keysight U1190A Series User’s Guide
Use the wire separator to separate individual wires or cables from a mesh of
wires or cables. See “Using the wire separator and hook” on page 42 for
more information.
Set up your clamp meter to measure AC current or DC current (U1194A model
only) as shown in Figure 2-2. Clamp the wire/cable, and read the display.
Press to measure the frequency of the AC current source (U1192A, U1193A,
and U1194A models only). See “Measuring Frequency” on page 64 to learn
more.
Page 41
Figure 2-1 AC current display
3
1
2
4
5
Conductor
Making Measurements 2
Figure 2-2 Measuring AC current
Keysight U1190A Series User’s Guide 41
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2 Making Measurements
Wire separator tip
Hook
Using the wire separator and hook
Your clamp meter’s design has a wire separator and hook feature (see Figure 2-3)
that can be used to separate individual wires or cables for measurements from a
mesh of wires or cables.
Use the wire separator and hook to avoid touching live wires or cables without the
necessary insulation protection or powering off the voltage or current source.
Follow the instructions below to use the wire separator and hook feature.
Figure 2-3 Wire separator and hook design
42 Keysight U1190A Series User’s Guide
Page 43
Making Measurements 2
Mesh of wires or cables
1 Open the clamp jaw slightly to reveal the wire separator tip. Use the wire
separator tip to locate the desired wire or cable.
2 Separate the wire or cable by hooking it in the clamp jaw securely and pulling
it back.
3 Close the clamp jaw to secure the wire or cable, and read the measurement.
Keysight U1190A Series User’s Guide 43
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2 Making Measurements
NOTE
NOTE
NOTE
Measuring AC Voltage
Reversing the leads will produce a negative reading, but it will not damage the
clamp meter.
Set up your clamp meter to measure AC voltage as shown in Figure 2-5. Probe the
test points, and read the display.
For U1193A and U1194A models:
AC voltage measurements measured with this clamp meter are returned as true
RMS (root mean square) readings. These readings are accurate for sinusoidal
waves. For non-sinusoidal waveforms, please refer to the Chapter 4,
“Characteristics and Specifications”.
Figure 2-4 AC vol tage display
Press to measure the frequency of the AC voltage source (U1192A, U1193A,
and U1194A models only). See “Measuring Frequency” on page 64 to learn
more.
44 Keysight U1190A Series User’s Guide
Page 45
Making Measurements 2
2
4
AC
Voltage source
1
3
Figure 2-5 Measuring AC voltage
Keysight U1190A Series User’s Guide 45
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2 Making Measurements
NOTE
Measuring DC Voltage
Set up your clamp meter to measure DC voltage as shown in Figure 2-7. Probe
the test points, and read the display.
This clamp meter displays DC voltage values as well as their polarity. Negative
DC voltages will return a negative sign on the left of the display.
Figure 2-6 DC voltage display
46 Keysight U1190A Series User’s Guide
Page 47
Making Measurements 2
DC
3
Voltage source
1
2
Figure 2-7 Measuring DC voltage
Keysight U1190A Series User’s Guide 47
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2 Making Measurements
CAUTION
NOTE
NOTE
Measuring Resistance
Set up your clamp meter to measure resistance as shown in Figure 2-9. Probe the
test points, and read the display.
To avoid possible damage to your clamp meter 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).
Figure 2-8 Resistance display
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.
– Because the clamp meter’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.
– The resistance function can produce enough voltage to forward-bias silicon
diodes or transistor junctions, causing them to conduct.
48 Keysight U1190A Series User’s Guide
Page 49
Making Measurements 2
3
Resistor
1
2
Figure 2-9 Measuring resistance
Keysight U1190A Series User’s Guide 49
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2 Making Measurements
CAUTION
NOTE
Testing for Continuity
Set up your clamp meter to test for continuity as shown in Figure 2-12. Probe the
test points, and read the display.
To avoid possible damage to your clamp meter 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 a complete path for current flow. The continuity
test features a beeper that sounds and a backlight that flashes as long as a
circuit is complete. The audible and visual alert allows you to perform quick
continuity tests without having to watch the display.
Press to switch between resistance measurement, or continuity test. See
Figure 2-12 to learn more.
Figure 2-10 Open continuity display
Figure 2-11 Closed continuity display
50 Keysight U1190A Series User’s Guide
Page 51
Making Measurements 2
NOTE
– You can set the beeper to sound and the backlight to flash as a continuity
indication whether the circuit-under-test is less than (short) the threshold
resistance.
– The continuity function detects intermittent shorts lasting as short as 1 ms.
A brief short causes the clamp meter to emit a short beep and flash.
– You can enable or disable the visual alert via the Setup menu. See “Changing
the continuity visual alert” on page 51 for more information.
Changing the continuity visual alert
You can set the backlight to flash along with the beeper sound as a continuity
indication whether the circuit-under-test is less than the threshold resistance.
Follow the steps below to enable or disable the continuity visual alert.
1 Press and hold while powering on the clamp meter to enter the Setup
menu.
2 Press again. The continuity visual alert ( ) is the fourth Setup item
shown.
3 Press to make changes to the continuity visual alert.
Press or to enable or to disable the continuity visual alert (the
backlight turns on or off).
4 Press to save the changes, or press to discard the changes and
proceed to the next Setup item.
5 Cycle the clamp meter’s power to exit the Setup menu.
Keysight U1190A Series User’s Guide 51
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2 Making Measurements
4
1
3
CLOSED
OPEN
2
Figure 2-12 Testing for continuity
52 Keysight U1190A Series User’s Guide
Page 53
Testing Diodes
CAUTION
NOTE
NOTE
Set up your clamp meter to test diodes as shown in Figure 2-15. Probe the test
points, and read the display.
To avoid possible damage to your clamp meter or to the equipment under
test, disconnect the circuit power and discharge all high-voltage capacitors
before testing diodes.
– Use the diode test to check diodes, transistors, silicon controlled rectifiers
– This test sends a current through a semiconductor junction, and then
– Connect the red test lead to the positive terminal (anode) of the diode and
Making Measurements 2
(SCRs), and other semiconductor devices. A good d iode allows current to
flow in one direction only.
measures the junction’s voltage drop.
the black test lead to the negative terminal (cathode). The cathode of a diode
is indicated with a band.
Figure 2-13 Diode display
Your clamp meter can display the forward-bias of a diode up to approximately
1.8 V. The forward-bias of a typical diode is within the range of 0.3 V to 0.8 V;
however, the reading can vary depending on the resistance of other pathways
between the probe tips.
Keysight U1190A Series User’s Guide 53
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2 Making Measurements
NOTE
If the beeper is enabled during diode test, the clamp meter will beep briefly for a
normal junction and sound continuously for a shorted junction.
Reverse the probes (as shown in Figure 2-16) and measure the voltage across the
diode again. Assess the diode according to the following guidelines:
– A diode is considered good if the clamp meter displays in reverse-bias
mode.
– A diode is considered shorted if the clamp meter displays approximately 0 V
in both forward and reverse-bias modes, and the clamp meter beeps
continuously.
– A diode is considered open if the clamp meter displays in both forward-
and reverse-bias modes.
Figure 2-14 Open diode display
54 Keysight U1190A Series User’s Guide
Page 55
Making Measurements 2
3
Forward-bias
diode
1
2
Figure 2-15 Testing forward-bias diode
Keysight U1190A Series User’s Guide 55
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2 Making Measurements
3
Reverse-bias
diode
1
2
Figure 2-16 Testing reverse-bias diode
56 Keysight U1190A Series User’s Guide
Page 57
Measuring Capacitance
CAUTION
NOTE
NOTE
This measurement function is applicable for U1192A, U1193A, and U1194A
models only.
Set up your clamp meter to measure capacitance as shown in Figure 2-18. Probe
the test points, and read the display.
To avoid possible damage to the clamp meter or to the equipment under
test, disconnect circuit power and discharge all high-vol tage capacitors
before measuring capacitance. Use the DC voltage function to confirm that
the capacitor is fully discharged.
The clamp meter measures capacitance by charging the capacitor with a known
current for a known period of time, measuring the resulting voltage, and then
calculating the capacitance.
Making Measurements 2
Figure 2-17 Capacitance display
For measuring capacitance values greater than 1000 μF, discharge the capacitor
first, then select a suitable range for measurement. This will speed up the
measurement time and also ensure that the correct capacitance value is
obtained.
Keysight U1190A Series User’s Guide 57
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2 Making Measurements
2
4
Capacitor
1
3
Figure 2-18 Measuring capacitance
58 Keysight U1190A Series User’s Guide
Page 59
Measuring Temperature
WARNING
CAUTION
NOTE
This measurement function is applicable for the U1194A model only.
Set up your clamp meter to measure temperature as shown in Figure 2-20. Probe
the test points, and read the display.
Do not connect the thermocouple to electrically live circuits. Doing so will
potentially cause fire or electric shock.
Do not bend the thermocouple leads at sharp angles. Repeated bending
over a period of time can break the leads.
– The clamp meter uses the type-K thermocouple probe (included in the
standard shipped items of a U1194A model) for measuring temperature.
– Shorting the terminal to the terminal will d isplay the temperature at
the clamp meter’s terminals.
Making Measurements 2
Keysight U1190A Series User’s Guide 59
Figure 2-19 Temperature display
Page 60
2 Making Measurements
CAUTION
NOTE
Changing the default temperature unit
Follow the steps below to change the temperature unit between Celsius (°C) or
Fahrenheit (°F).
1 Press and hold and while powering on the clamp meter to enter the
temperature unit selection menu.
2 Press to make changes to the temperature unit.
Press or to change the temperature unit (°C or °F).
3 Press to save the changes.
4 Cycle the clamp meter’s power to exit the temperature unit selection menu.
Always set the temperature unit display per the official requirements and in
compliance with the national laws of your region.
The bead-type thermocouple probe is suitable for measuring temperatures from
–40 °C to 204 °C (399 °F) in PTFE-compatible environments. Do not immerse this
thermocouple probe in any liquid. For best results, use a thermocouple probe
designed for each specific application — an immersion probe for liquid or gel,
and an air probe for air measurement.
Observe the following measurement techniques:
– Clean the surface to be measured, and ensure that the probe is securely
touching the surface. Remember to disable the applied power.
– When measuring above ambient temperatures, move the thermocouple
along the surface until you get the highest temperature reading.
– When measuring below ambient temperatures, move the thermocouple
along the surface until you get the lowest temperature reading.
– Place the clamp meter in the operating environment for at least 1 hour as the
clamp meter is using a non-compensation transfer adapter with miniature
thermal probe.
60 Keysight U1190A Series User’s Guide
Page 61
Making Measurements 2
2
4
1
3
K-type
thermocouple
probe
Heat source
Figure 2-20 Measuring the surface temperature
Keysight U1190A Series User’s Guide 61
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2 Making Measurements
WARNING
CAUTION
Measuring AC or DC Current (up to µA)
Never attempt an in-circuit current measurement where the open-circuit
potential to earth is greater than 1000 V. Doing so will cause damage to the
clamp meter and possible electric shock or personal injury.
– To avoid possible damage to the clamp meter or to the equipment under
test, use the proper terminals, function, and range for your measurement.
Use the clamp jaw for currents above 600 µA.
To measure current, you must open the circuit under test, then place the
–
clamp meter in series with the circuit.
parallel with) any circuit or component when the leads are plugged into
the current terminals.
– Placing the probes across (in parallel with) a powered circuit when a lead
is plugged into a current terminal can damage the circuit you are testing.
This happens because the resistance through the clamp meter's current
terminals is very low, resulting in a short circuit.
Never place the probes across (in
This measurement function is applicable for the U1194A model only.
Set up your clamp meter to measure AC or DC current (up to μA) as shown in
Figure 2-22. Probe the test points, and read the display.
Figure 2-21 DC current display
62 Keysight U1190A Series User’s Guide
Page 63
Making Measurements 2
AC
2
4
1
Voltage source
DC
Voltage source
LOAD
3
LOAD
Figure 2-22 Measuring AC/DC current (up to µA)
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2 Making Measurements
WARNING
NOTE
Rise Time Fall Time
+ Width – Width
Period
90%
50%
10%
Measuring Frequency
Never measure the frequency where the voltage or current level exceeds the
specified range.
This measurement function is applicable for U1192A, U1193A, and U1194A
models only.
Your clamp meter allows simultaneous monitoring of real- time voltage or current
with frequency measurements.
– 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 the figure below.
64 Keysight U1190A Series User’s Guide
– The clamp meter measures the frequency of a voltage or current signal by
counting the number of times the signal crosses a threshold level within a
specified period of time.
Page 65
Figure 2-23 Frequency display
3
1
2
4
Conductor
Making Measurements 2
Figure 2-24 Measuring frequency
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Keysight U1190A Series Handheld Clamp Meters
User’s Guide
3 Clamp Meter Features
Detecting AC Voltage Presence (Vsense) 68
Making Relative Measurements (Null) 71
Capturing Maximum and Minimum Values (Max.Min) 72
Freezing the Display (Hold) 74
The chapter describes the additional features available in your clamp meter.
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3 Clamp Meter Features
WARNING
CAUTION
NOTE
Detecting AC Voltage Presence (Vsense)
– You are advised to test on a known live circuit within the rated AC voltage
range of this product before and after each use to ensure that the Vsense
detector works.
– Voltage could still be present even if there is no Vsense alert indication.
Do not rely on the Vsense detector with shielded wire. Never touch live
voltage or conductor without the necessary insulation protection or
power off the voltage source.
– The Vsense detector may be affected by differences in socket design,
insulation thickness, and insulation type.
You are advised to measure voltage by using test leads through the AC V or
DC V function after using the Vsense function, even if there is no alert
indication.
This measurement function is applicable for U1192A, U1193A, and U1194A
models only.
The Vsense detector is a non-contact voltage detector that detects the presence
of AC voltages nearby.
Set up your clamp meter to enable the Vsense function as shown in Figure 3-3.
If the presence of AC voltage is sensed, the clamp meter’s beeper will sound.
The audible alert allows you to easily sense nearby AC voltage presence.
No resolution and accuracy of voltage measurement will be displayed in this
mode.
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Clamp Meter Features 3
NOTE
– Place the top of the clamp meter close to a conductor when sensing for AC
voltages (as low as 24 V in the Hi.SE setting).
– The low sensitivity setting can be used on flush mounted wall sockets or
outlets and various power strips or cords.
– The high sensitivity setting allows for AC voltage sensing on other styles of
recessed power connectors or sockets where the actual AC voltage is
recessed within the connector itsel f.
Press to toggle the Vsense detector’s sensitivity between Hi.SE (high
sensitivity) or Lo.SE (low sensitivity).
Figure 3-1 Vsense (high sensitivity) display
Figure 3-2 Vsense (low sensitivity) display
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3 Clamp Meter Features
Voltage source
Figure 3-3 Detecting voltage presence
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Making Relative Measurements (Null)
NOTE
When making Null measurements, also called relative, each reading is the
difference between a stored (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. Nulling the leads is also particularly important
prior to making capacitance measurements.
1 To activate the relative mode, press the key. The measurement value at
the time, when Null is enabled, is stored as the reference value.
Figure 3-4 Null display
Clamp Meter Features 3
2 To disable the Null function, press again.
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 clamp meter will read a non-zero value even
when the two test leads are in direct contact because of the resistance of
these leads. Use the Null function 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.
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3 Clamp Meter Features
NOTE
Capturing Maximum and Minimum Values (Max.Min)
The Max.Min operation stores the maximum, minimum, and average input values
during a series of measurements.
When the input goes below the recorded minimum value or above the recorded
maximum value, the clamp meter beeps and records the new value. The clamp
meter also calculates an average of all readings taken since the Max.Min mode
was activated.
From the clamp meter’s display, you can view the following statistical data for any
set of readings:
– Max: highest reading since the Max.Min function was enabled
– Min: lowest reading since the Max.Min function was enabled
– Avg: average or mean of all readings since the Max.Min function was enabled
– MaxMinAvg: present reading (actual input signal value)
1 Press and hold for more than 1 second to enable the Max.Min operation.
2 Press again to cycle through the Max, Min, Avg, or present (MaxMinAvg)
input values.
3 Press for more than 1 second to disable the Max.Min function.
Figure 3-5 Max.Min display
If an overload is recorded, the averaging function will be stopped. is shown in
place of the average value.
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Clamp Meter Features 3
This mode is useful for capturing intermittent readings, recording minimum and
maximum readings unattended, or recording readings while equipment operation
keeps you from observing the clamp meter display.
The true average value displayed is the arithmetic mean of all readings taken
since the start of recording. The average reading is useful for smoothing out
unstable inputs, calculating power consumption, or estimating the percentage of
time a circuit is active.
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3 Clamp Meter Features
Freezing the Display (Hold)
To freeze the display for any function, press the key.
Figure 3-6 Hold display
Press again to disable this function.
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Keysight U1190A Series Handheld Clamp Meters
User’s Guide
4 Characteristics and
Specifications
For the characteristics and specifications of the U1190A Series Handheld Clamp
Meters, refer to the datasheet at
http://literature.cdn.keysight.com/litweb/pdf/5990-8646EN.pdf.
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4 Characteristics and Specifications
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This information is subject to change
without notice. Always refer to the
Keysight website for the latest
revision.
© Keysight Technologies 2011 - 2017
Edition 8, June 1, 2017
Printed in Malaysia
*U1191-90003*
U1191-90003
www.keysight.com
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