Keysight U1281A/
U1282A Handheld
Digital Multimeter
Quick Start Guide
Safety Notices
CAUTION
WARNING
CAT III
1000 V
CAT IV
600 V
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.
Safety Information
The U1281A/U1282A is
safety-certified in compliance with
IEC/EN 61010-1, IEC/EN
61010-2-030, IEC/EN
61010-2-033, CAN/CSA-C22.2 No.
61010-1, CAN/CSA-C22.2 No.
61010-2-030, CAN/CSA-C22.2 No.
61010-2-033, UL Std. No.
61010-1, UL Std. No. 61010-2-030
and UL Std. No. 61010-2-033. Use
with standard or compatible test
probes.
Safety symbols
Direct current (DC)
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.
EMC Information
The U1281A/U1282A is
EMC-certified in compliance with
IEC 61326-1/EN 61326-1,
CISPR11/EN55011 Group 1 Class
A, ICES/NMB-001, and AS/NZS
CISPR 11.
Alternating current (AC)
Caution, risk of danger
(refer to this manual for
specific Warning or
Caution information)
Earth (ground) terminal
Equipment protected
throughout by double
insulation or reinforced
insulation
Category III 1000 V
overvoltage protection
Category IV 600 V
overvoltage protection
For further safety information details, refer to the
Keysight U1281A/U1282A Handheld Digital Multimeter
User’s Guide.
2 Keysight U1281A/U1282A Quick Start Guide
Standard Shipped Items
NOTE
NOTE
Verify that you have received the following items
with the shipment of your U1281A/U1282A
multimeters:
✔ Test probes
✔ Infrared (IR)-to-USB cable
✔ AA batteries (4x)
✔ Certificate of Calibration
If any item is missing or damaged, keep the
shipping materials and contact the nearest Keysight
Sales Office.
– The descriptions and instructions in this guide
apply to the U1281A and U1282A Handheld
Digital Multimeters.
– The model U1282A appears in all illustrations.
– All related documents and software are
available for download at
www.keysight.com/find/hhTechLib.
Your multimeter is capable of receiving remote
commands and performing remote data logging. To
use these features, you will need either an
IR-to-USB cable (included in the shipment) or an
IR-to-Bluetooth
separately), and the Keysight Handheld Meter
Logger Software (downloadable from
www.keysight.com/find/hhmeterlogger).
For more information on the remote commands,
refer to the U1281A/U1282A Programming Guide.
®
adapter (U1117A, purchased
Keysight U1281A/U1282A Quick Start Guide 3
Install or Change the Batteries
A
m
A
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V
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1
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1
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V
6
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1 2
6
3
4 5
7 8
V
A
V
mV
mV
mA
OUT
MHz
The multimeter is powered by four 1.5 V AA
batteries (included in the shipment).
Before installing or changing the batteries, pull from
a corner and stretch the orange rubber holster to
remove it.
Turn On the Multimeter
Turn the rotary switch from the position to any
other position to begin making measurements.
4 Keysight U1281A/U1282A Quick Start Guide
The Multimeter at a Glance
A
mA
COM
V
V
A
V
mV
mV
U1282A
True RMS Multimeter
mA
Vsense
Peak
Vsense
Dual
Auto
FUSED
440mA
CAT III 1000V
600VCAT IV
MAX
10A MAX
FUSED
OUT
OUT
MHz
RMT
Vsense red LED indicator
Display screen
Keypad
Rotary switch
Input terminals
IR communication port
Test lead/probe holders
Battery access
(under the orange rubber holster)
Tilt stand
Fuse access
(under the orange rubber holster)
Keysight U1281A/U1282A Quick Start Guide 5
Using the Rotary Switch
V
mV
V
mV
MHz
mA
A
OUT
WARNING
Legend Measurement function
AC V/AC V with Low Pass Filter (LPF)
AC mV/AC mV with LPF
DC/AC/AC+DC V ✔✔
DC/AC/AC+DC mV ✔✔
Resistance/Continuity ✔✔
Diode/Frequency counter
Capacitance/Temperature ✔✔
DC μA/mA/AC μA/mA/AC+DC μA/mA ✔✔
DC A/AC A/AC+DC A ✔✔
Square wave mode
[a]
Model
U1281A U1282A
[a]
✔✔
[a]
[a]
✔✔
✔✔
— ✔
[a] For U1282A only.
Remove the test leads from the measuring source
or target before changing the rotary switch
position.
Refer to the U1281A/U1282A User’s Guide for a
complete list and description of all rotary switch
labels.
6 Keysight U1281A/U1282A Quick Start Guide
Using the Keypad
MaxMin
Vsense
Range
Hz
Save
Esc
Shift
Hold
Legend
Key response when pressed for:
Less than 1 second More than 1 second
– Starts the Max/Min/Avg
record ing
– Switches between the
Max/Min/Avg recording
modes
– Stops the Max/Min/Avg
record ing
– Starts and stops the
Peak recording
Enables and disables the
Sets the Null/Relative mode
non-contact vol tage
detection – Vsense
Sets a manual range Enables autoranging
Enables the frequency test
mode for current or voltage
measurements
Starts and stops data
logging
Activates and deactivates
Turns the backlight on/off
the dual d isplay mode (if
supported by the
measurement)
Switches between the
regular and shifted (icons
printed in orange) functions
Enters the Log Review
menu
– Freezes the present
reading in the d isplay
(TrigHold mode)
– Automatically freezes the
present reading when
certain cond itions are met
(AutoHold mode; when
enabled from the
multimeter’s Setup mode)
Exits the TrigHold mode
– Exits the AutoHold mode
– Stores a record of the
measured signal and
exports it via the
multimeter’s optical
communication port
[a]
[a] For the U1282A only
Keysight U1281A/U1282A Quick Start Guide 7
Using the Input Terminals
WARNING
V
V
COM
mV
V
mV
MHz
mA
mA
COM
A
A
COM
OUT
RMT
Hold
To avoid damaging this device, do not exceed the
input limit.
Rotary
position
Input terminals Overload protection
1000 Vrms
1000 Vrms for short
circuit <0.3 A
440 mA/1000 V,
fast-acting fuse
11 A/1000 V,
fast-acting fuse
This input terminal is for use with the Remote Switch Probe (purchased
separately). The button on the probe emulates the button on the
multimeter by default.
8 Keysight U1281A/U1282A Quick Start Guide
Safety Alerts and Warnings
CAUTION
Hazardous voltage indication
The multimeter will display the hazardous voltage
( ) symbol as an early precaution when the
measured voltage is:
Measurement DC AC
V (mV) ≥ +30 V or +OL ≤ –30 V or –OL ≥ 30 V or OL
This symbol will also be displayed when the input
signal exceeds the limitation of measuring circuit as
frequency dependence.
Hazardous current indication
The multimeter will display the hazardous current
( ) symbol as an early precaution when the
measured current has reached the maximum fuse
rating as follows:
Measurement DC AC
A ≥ +11 A or +OL ≤ –11 A or –OL ≥ 11 A or OL
μA/mA ≥ 440 mA or +OL ≤ –440 mA or –OL ≥ 440 mA or OL
If your measuring current is > 10 A ~ 19.999 A, you
will need to lower the current within a 30-second
time limitation to avoid blowing the multimeter’s
fuse.
Keysight U1281A/U1282A Quick Start Guide 9
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