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Agilent U1273A/U1273AX
Handheld Digital Multimeter
Quick Start Guide
Verify that you received the following items in the shipment of
your multimeter:
One pair of red and black test leads
One pair of 4 mm test probes
One K-type thermocouple lead kit
Four 1.5 V AAA alkaline batteries (for U1273A) or lithium
batteries (for U1273AX)
Printed copies of the Certificate of Calibration (CoC) and
the U1273A/U1273AX Quick Start Guide (this manual)
If any item is missing or damaged, keep the shipping materials
and contact the nearest Agilent Sales Office.
NO TE
The descriptions and instructions in this guide apply to the
U1273A/U1273AX handheld digital multimeter.
All related documents and software are available for download
at www.agilent.com/find/hhTechLib.
Agilent Technologies
U1273A/U1273AX Handheld Digital Multimeter
Install the Batteries
Install the Batteries
Your multimeter is powered by four 1.5 V AAA batteries
(included with the shipment).
1 Turn the rotary switch to OFF and remove
the test leads from the terminals.
2 Lift the tilt stand and loosen the screws
with a suitable Phillips screwdriver.
3 Remove the battery cover and observe the
polarity markings.
4 Insert the batteries and replace the battery cover and screws.
Turn On the Multimeter
To power ON your multimeter, turn the rotary switch from the
OFF position to any other position.
NO TE
Your multimeter is capable of remote data logging. To use this
feature, you will need an IR-USB cable (U1173A, purchased
separately) and the Agilent GUI Data Logger Software (down-
loadable from www.agilent.com/find/hhTechLib).
Auto Dim
By default, the multimeter's Auto Dim function is enabled. The
multimeter's backlight will dim automatically after 90 seconds
of inactivity. Press any button to cancel this effect and reset
the Auto Dim timer.
You may change how the multimeter's backlight behavior
through the Setup menu. Refer to the User's Guide for further
instructions.
2 U1273A/U1273AX Quick Start Guide
U1273A/U1273AX Handheld Digital Multimeter
The Multimeter at a Glance
The Multimeter at a Glance
Display screen
Keypad
Rotary switch
Input terminals
Test lead/probe holders
IR communication port
Battery cover
(Lift tilt stand for access)
Tilt stand
U1273A/U1273AX Quick Start Guide 3
U1273A/U1273AX Handheld Digital Multimeter
Understanding the Rotary Switch
Understanding the Rotary Switch
NO TE
Press to switch between the primary and shifted func-
Shift
Esc View
tions shown on the rotary switch.
Legend Description
ZLOW ZLOW (low input impedance) AC/DC V for eliminating
ghost voltages
Off
AC V
AC V with Low Pass Filter
AC mV
AC mV with Low Pass Filter
DC V
AC V or AC+DC V
DC mV
AC mV or AC+DC mV
Resistance
Smart
Continuity or Smart (offset compensation)
Diode
Auto
Auto-diode
Capacitance
Temperature
DC mA (or A)
AC mA (or A) or AC+DC mA (or A)
DC A
AC A or AC+DC A
4 U1273A/U1273AX Quick Start Guide
U1273A/U1273AX Handheld Digital Multimeter
Understanding the Keypad
Understanding the Keypad
Key response when pressed for:
Legend
Less than 1 second More than 1 second
Sets the Scale mode for
Sets the Null/Relative
Null
Scale
the specified ratio and
mode.
unit display.
MaxMin Starts the MaxMin Starts and stops the
Peak
recording. Peak recording.
Automatically freezes
Trig Freezes the present
Auto Hold the present reading once
reading in the display.
the reading is stable.
Exits the Hold, Null,
Switches between avail-
Dual MaxMin, Peak, fre-
Exit able dual-combination
quency test, and dual
displays.
display modes.
Increases the OLED
brightness incremen-
Enters and exits the mul-
tally when LOW,
Setup timeter's Setup menu.
MEDIUM, or HIGH set-
ting is selected.
Switches between fre-
Hz % ms
quency, pulse width, and Starts and stops the
Log
duty cycle measure- Data Logging.
ments.
Sets a manual range and
Range Enables auto-ranging.
Auto disables autoranging.
Switches between the
Shift
Enters and exits the Log
Esc View primary and shifted
Review menu.
functions.
U1273A/U1273AX Quick Start Guide 5
U1273A/U1273AX Handheld Digital Multimeter
Understanding the Input Terminals
Understanding the Input Terminals
WA RN ING
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
ZLOW
1000 Vrms for short
circuit <0.3 A
Smart
Auto
11 A/1000 V
fast-acting fuse
440 mA/1000 V
or fast-acting fuse
6 U1273A/U1273AX Quick Start Guide
U1273A/U1273AX Handheld Digital Multimeter
Performing Measurements and Tests
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 per-
form voltage measurements. When measuring DC voltage from
a mixed signal in DC measurement mode, ensure that the Filter
( ) is enabled.
4
3
DC
2
1
U1273A/U1273AX Quick Start Guide 7
U1273A/U1273AX Handheld Digital Multimeter
Performing Measurements and Tests
1 Press for more than 1 second to enter the multimeter's
Setup
setup menu.
Hz % ms
2 Browse to Menu 6 > Filter, and press Log to edit the
value.
Dual
3 Press or
Exit to enable the Filter.
Setup
Refer to the table below for the respective firmware ver-
sions.
Version 1.64 or older Version 1.95 or newer
on DC
Hz % ms
4 Press Log to save your changes.
5 Press and hold until the multimeter restarts and returns
Setup
to normal operation. Turn the multimeter to DC Voltage
mode to verify that the LPF symbol is turned on.
To avoid possible electric shock or personal injury, enable
CAU TI O N 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.
LPF during AC measurements:
Shift
Press while performing AC
Esc View
voltage measurements to pass the
measured signal through a low pass
filter.