Keysight U1271A User manual

Keysight U1271A/U1272A
Handheld Digital
Multimeter
Quick Start
Guide

Contacting Keysight
www.keysight.com/find/assist
(worldwide contact information for
repair and service)
Safety and EMC Information
The U1271A/U1272A is
safety-certified in compliance with
EN/IEC 61010-1, EN/IEC
61010-2-033, CAN/CSA-C22.2
No.61010-1-12, CAN/CSA-C22.2
No.61010-2-033-12,ANSI/UL Std.
No. 61010-1, ANSI/UL Std. No.
61010-2-033, CAT III 1000 V,
CAT IV 600 V for pollution degree
2 environment.
EMC is designed in compliance
with EN 61326-1.
Safety Notices
CAUTION
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.
WARNING
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.
Safety symbols
Earth (ground) terminal
Equipment protected
throughout by double
insulation or reinforced
insulation
Caution, risk of electric
shock
Caution, risk of danger
(refer to this manual for
specific Warning or Caution
information)
2 Keysight U1271A/U1272A Quick Start Guide
For further safety information details, refer to the
Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide.
ENGLISH

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Verify that you received the following items in the
shipment of your multimeter:
4One pair of red and black test leads
4One pair of 4 mm test probes
4One K-type thermocouple lead kit
4Four 1.5 V AAA alkaline batteries
4Printed copy of the U1271A/U1272A Quick
Start Guide
4Printed copy of the Certificate of Calibration
If any item is missing or damaged, keep the
shipping materials and contact the nearest
Keysight Sales Office.
NOTE
The descriptions and instructions in this guide apply
to the U1271A and U1272A Handheld Digital
Multimeters.
The model U1272A appears in all illustrations.
All related documents and software are available for
download at www.keysight.com/find/hhTechLib.
Keysight U1271A/U1272A Handheld Digital
Multimeter Quick Start Guide

4 Keysight U1271A/U1272A Quick Start Guide
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Differences between the U1271A and U1272A
The U1272A model offers these additional
functions:
–Z
LOW (low input impedance) measurements
– Smart Ωmeasurements
–Auto-diodetests
– AC+DC voltage and current measurements
– J-type thermocouple temperature
measurements
– 30 Ωand 300 MΩranges for resistance
measurements
– dBm and dBV measurements with selectable
impedance
– Data logging up to 10,000 memories
The U1271A model has one differing function:
– Qik-V tests
Install the Batteries
Your multimeter is powered by four 1.5 V AAA
alkaline batteries (included with the shipment).
1Turn the rotary switch to OFF
and remove the test leads
from the terminals.
2Lift the tilt stand and loosen
the screws with a suitable
Phillips screwdriver.
3Remove the battery cover and observe the
polarity markings.
4Insert the batteries and replace the battery
cover and screws.

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Keysight U1271A/U1272A Quick Start Guide 5
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Turn On the Multimeter
To power ON your multimeter, turn the rotary
switch to any other position.
The Multimeter at a Glance
NOTE
Your multimeter is capable of remote data logging.
To use this feature, you will need an IR-USB cable
(U1173A, purchased separately) and the Keysight
GUI Data Logger Software (downloadable from
www.keysight.com/find/hhTechLib).
Display screen
Keypad
Rotary switch
Input terminals

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Understanding the Rotary Switch
Test lead/probe holders
IR communication port
Battery access cover
Tilt stand
U1271A U1272A
NOTE
Press to switch between the shifted and
regular functions.
Shift
View
Esc

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Legend Description
AC V with Low Pass Filter
AC mV with Low Pass Filter
DC, (AC, or AC+DC V, U1272A only)
DC, (AC, or AC+DC mV, U1272A only)
Resistance/Continuity/(Smart Ω, U1272A only)
Diode/(Auto-diode, U1272A only)
Capacitance/Temperature
AC, DC, or (AC+DC mA and A, U1272A only)
AC, DC, or (AC+DC μA, U1272A only)
AC/DC V check for signal identification (U1271A only)
ZLOW (low input impedance) AC/DC V for checking ghost voltages
(U1272A only)
Smart
Auto

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Understanding the Keypad
Legend Key response when pressed for:
Less than 1 second More than 1 second
Sets the Null/Relative mode. Sets the Scale mode for the
specified ratio and unit display.
Starts and stops the MaxMin
recording.
Starts and stops the Peak
recording.
Freezes the present reading in
the display.
Automatically freezes the present
reading once the reading is
stable.
Switches between available
dual-combination displays.
Exits the Hold, Null, MaxMin,
Peak, frequency test, and dual
display modes.
Turns the backlight on/off. Enters/Exits the multimeter’s
setup menu.
Switches between frequency,
pulse width, and duty cycle
measurements.
Starts and stops the Data
Logging.
Sets a manual range. Enables autoranging.
Switches between the regular
and shifted (icons printed in
orange) functions.
Enters the Log Review menu.
Scale
Null
Peak
MaxMin
Auto
TrigHold
Exit
Dual
Setup
Hz%ms
Log
Auto
Range
Shift
View
Esc

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Keysight U1271A/U1272A Quick Start Guide 9
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Understanding the Input Terminals
WARNING
Ensure that the terminal connections are correct for
that particular measurement function before starting
any measurement. To avoid damage to the device, do
not exceed the input limit.
Rotary position Input terminals Overload protection
1000 Vrms
1000 Vrms for short
circuit <0.3 A
11 A/1000 V, 30 kA
fast-acting fuse
440 mA/1000 V, 30 kA
fast-acting fuse
Smart
Auto

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Performing Measurements and Tests
Voltage measurements
The figure below highlights the primary functions
allowing voltage measurements in your
multimeter.
Set up your multimeter as shown in the figure
below to perform voltage measurements. When
measuring DC voltage from a mixed signal in DC
measurement mode, ensure that the Filter ( ) is
enabled.
U1271A U1272A
DC

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1Press for more than 1 second to enter the
multimeter’s setup menu.
2Press or until is
shown on the secondary display.
3Press or to enable the Filter.
Refer to the table below for the respective
firmware versions.
4Press to save your changes.
5Press and hold until the multimeter
restarts and returns to normal operation. Turn
the multimeter to DC Voltage mode to verify
that the LPF symbol is turned on.
LPF during AC measurements:
– Passing the measured signal through a LPF
help blocks unwanted voltages such as
electronic noise.
Setup
Peak
MaxMin
Au to
Range
Exit
Dual
Setup
Version 2.00 Version 2.04 or newer
on dC
Hz %ms
Log
Setup
CAUTION
To avoid possible electric shock or personal injury,
enable the Filter ( ) to verify the presence of
hazardous DC voltages. Displayed DC voltages can
be influenced by high frequency AC components
and must be filtered to assure an accurate reading.
Press while performing AC
voltage measurements to pass the
measured signal through a low pass
filter.
Shift
View
Esc

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– Use the LPF function to improve measurement
on composite sine waves that are typically
generated by inverters and variable frequency
motor drives.
ZLOW measurements (U1272A only):
–UsetheZ
LOW (low input impedance) function
to detect ghost or induced voltages.
– Ghost voltages can be caused by capacitive
coupling between energized wiring and
adjacent unused wiring.
Qik-V test (U1271A only):
– Use the Qik-V function to quickly identify the
measured signal type.
– Use this function as a reference to determine
if the measured signal is an AC or DC signal,
then select the appropriate voltage
measurement function by turning the rotary
switch to an appropriate position (AC or DC).
Rotate the rotary switch’s position to
to enable low impedance
measurements.
Rotate the rotary switch’s
position to to enable the
Qik-V function.

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Keysight U1271A/U1272A Quick Start Guide 13
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Resistance measurements
Set up your multimeter as shown in the figure
below to perform resistance measurements.
Smart Ωmeasurements (U1272A only):
– Use the Smart Ωfunction to measure resistors
affected by DC offset or leakage current.
– If DC offset or bias voltages are detected on
the resistor-under-measure, the offset or bias
DC voltage value will be shown on the
secondary display. If the DC voltage on the
resistor is over +1.25 V, is shown on the
secondary display.
While performing resistance
measurements, press until
is shown on the display to
enable the Smart Ωfunction.
Shift
View
Esc

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Continuity tests
Set up your multimeter as shown in the figure
below to perform continuity tests. Press to
switch to the continuity test function ( is shown
on the display).
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)
or more than or equal to (open) the threshold
resistance.
Press to switch between short ( ) and open
( ) states for checking NO (normal open) and
NC (normal close) contacts.
Shift
View
Esc
Exit
Dual
ON
(closed)
OFF
(open)
NOTE
The continuity function detects intermittent shorts
and opens lasting as short as 1 ms. A brief short or
open causes the multimeter to emit a short beep
and flash.

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Keysight U1271A/U1272A Quick Start Guide 15
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Diode tests
Set up your multimeter as shown in the figure
below to perform diode tests.
Auto-diode tests (U1272A only):
– The Auto-diode function tests both the
forward bias and reverse bias directions of
your diode simultaneously. The forward bias
voltage is shown on the primary display and
the reverse bias voltage is shown on the
secondary display.
Press until is shown on
the display to use the auto diode
function.
Shift
View
Esc

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– will be indicated briefly on the secondary
display along with a brief beep if the diode is
found to be in good condition. is shown if
the diode is out of the thresholds.
Capacitance measurements
Set up your multimeter as shown in the figure
below to perform capacitance measurements.
NOTE
is shown on the bottom left of the display when
the capacitor is charging, and is shown when the
capacitor is discharging.

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Keysight U1271A/U1272A Quick Start Guide 17
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Temperature measurements
Set up your multimeter as shown in the figure
below to perform temperature measurements.
WARNING
Do not connect the thermocouple to electrically live
circuits. Doing so will potentially cause fire or electric
shock.
NOTE
The multimeter uses a type-K (default setting)
temperature probe for measuring temperature.

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Current measurements
Set up your multimeter as shown in the figure
below to perform current measurements. Press
to switch between AC, DC, AC+DC, or %
scale current measurements. When measuring
DC current from a mixed signal in DC
measurement mode, ensure that the Filter ( ) is
enabled.
Shift
View
Esc
WARNING
Always use the proper function, range, and terminals
for current measurements. Set the positive input
terminal to the terminal for currents below
440 mA, and the terminal for currents above
440 mA.
AC
LOAD

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Keysight U1271A/U1272A Quick Start Guide 19
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Contacting Keysight
To obtain service, warranty or technical assistance, contact us at the
following phone numbers:
–United States Call Center: 800-829-4444
–Canada Call Center: 877-894-4414
–China Call Center: 800-810-0189
–Europe Call Center: 31-20-547-2111
–Japan Call Center: (81) 426-56-7832
For other countries, contact your country’s Keysight support
organization. A list of contact information for other countries is
available on the Keysight Website: www.keysight.com/find/assist
Safety Notices Safety Information
This meter is safety-certified in
compliance with EN/IEC 61010-1:2001,
ANSI/UL 61010-1:2004, and
CAN/CSA-C22.2 No.
61010-1-04. Use with standard or
compatible test probes.
Safety Symbols
CAUTION
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.
WARNING
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 cond itions
are fully understood
and met.
Earth (ground) terminal
Caution, risk of electric
shock
Caution, risk of danger
(refer to the instrument
manual for specific
Warning or Caution
information)
Category III 1000 V
overvoltage protection
Category IV 600 V
overvoltage protection
CAT III
1000 V
CAT IV
600 V
For further safety information details, refer to the Keysight
U1271A/U1272A Handheld Digital Multimeter User’s Guide.

20 Keysight U1271A/U1272A Quick Start Guide
20 Keysight U1271A/U1272A Quick Start Guide
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