Agilent Technologies U1251A User manual

Agilent U1251A and U1252A Handheld Digital Multimeter
Quick Start Guide
The following items are included with your multimeter:
✔Standard Test Lead Kit (test leads, alligator clips, SMT grabbers, fine
tip test probes, mini- grabber)
✔Soft carrying case
✔Printed Quick Start Guide
✔CD containing the User’s Guide, application software and instrument
drivers
✔9 V alkaline battery (for U1251A only)
✔Rechargeable 7.2 V battery (for U1252A only)
✔Power cord & AC adapter (for U1252A only)
✔Certificate of Calibration
If anything is missing, contact your nearest Agilent Sales Office.
WARNING Ensure the terminal connections are correct for that particular measurement
before any measurement. To avoid damaged to the device, do not exceed the
input limit.
Agilent Technologies

U1251A and U1252A Quick Start Guide
Performing Voltage Measurement
Performing Current Measurement
CAUTION •If the current is ≤440 mA, connect the red and black test leads to input terminals
µA.mA(red) and COM(black).
•If the current is >440 mA, connect the red and black test leads to input terminals
A(blue) and COM(black).
Measuring AC Voltage Measuring DC Voltage
1Set the rotary switch to .
For and mode,
press to ensure is
shown on the display.
2Connect the red and black test
leads to input terminals V.
mV(red) and COM(black)
respectively.
3Probe the test points and read
the display.
4Press to display dual
measurements. Parameter can
be switched consecutively.
1Set the rotary switch to
and . Ensure is
shown on the display.
2Connect the red and black
test leads to input terminals
V. mV(red ) and COM(black)
respectively.
3Probe the test points and
read the display.
4Press to display dual
measurements. Parameter can
be switched consecutively.
Measuring AC Current Measuring DC Current
1Set the rotary switch to
and . Press to
ensure is shown on the
display.
2Connect the red and black test
leads to input terminals
µA.mA(red) and COM(black)
or A(blue) and COM(black)
respectively.
3Probe the test points in series
with the circuit, and read the
display.
1Set the rotary switch to
and . Ensure is
shown on the display.
2Connect the red and black
test leads to input terminals
µA.mA(red) and COM(black)
or A(blue) and COM(black)
respectively.
3Probe the test points in
series with the circuit, and
read the display.

Performing Resistance, Conductance and Testing Continuity
Measurements
Performing Capacitance and Temperature Measurements
1Set the rotary switch to
.
2Connect the red and black
test leads to input
terminals Ω(Red) and
COM(black) respectively.
3Probe the test points (by
shunting the resistor) and
read the display.
4Press to scroll
through audible
continuity, conductance
and resistance tests as
shown.
Audible
Continuity
1Set the rotary switch to
.
2Connect the red and black
test leads to input
terminals (red) and
COM(black) respectively.
3Use the red probe lead on
the positive terminal of the
capacitor while the black
probe lead on the negative
terminal.
4Read the display.
Capacitance
1Turn the rotary switch to
position. Press to
select temperature
measurement.
2Plug the thermocouple
adapter (with the
thermocouple probe connected
to it) into input terminals
TEMP(red) and COM(black).
3Touch the measurement
surface with the thermocouple
probe.
4Read the display.
Temperature
U1251A and U1252A Quick Start Guide

U1251A and U1252A Quick Start Guide
Frequency and Frequency Counter Measurements
Square Wave Output (for U1252A only)
WARNING Use the frequency counter for low voltage application. Never use the
frequency counter on line power system.
Frequency Measurement
During AC/DC voltage or AC/DC current measurements, you can
measure the relevant frequency by pressing at anytime.
Frequency Counter Measurement
1Set the rotary switch to .
2Press to select the frequency counter (Hz) function. “—1—” on
the secondary display means the input signal frequency is divided
by 1. This accommodates for higher frequency range of up to 2
MHz.
3Connect the red and black test leads to input terminals V(red) and
COM(black) respectively.
4Probe the test points and read the display.
5If the reading is unstable or zero, press to select divison of
input signal frequency by 100. This accommodates for higher
frequency range of up to 20 MHz.
6The signal is out of specification if the reading is still unstable
after Step 5.
1Turn the rotary switch to position. Default display
setting is 600 Hz on secondary display and 50% duty cycle on
primary display.
2Press or to scroll through the available frequencies
(there are 28 frequencies to choose from).
3Press to select duty cycle (ms) on primary display.
4Press or to adjust the duty cycle. Duty cycle can be set
for 256 steps and each step is 0.390625%. The display only
indicates the best resolution with 0.001%.
NOTE Pressing is the same as pressing .

Features and Functions
Actions Steps
Turns ON backlight Press
Checks battery capacity Press and hold for > 1 s
Freezes the measured value Press
Starts MIN/MAX/AVG recording Press and hold for > 1s
Offsets the measured value Press
Changes the measuring range Press
Turns on auto range Press and hold for > 1 s
Turns on dual display Press
Starts manual data logging Press and hold for > 1s
Views the logged data Press for > 1s, press
to scroll through the logged data
Clears the logged data Press for > 1 s, press for
> 1 s
Input Terminals and Overload Protection
Measurement
Functions
Input Terminal Overload Protection
Voltage
COM
1000 V R.M.S.
Diode
1000 V R.M.S
< 0.3 A short circuit current
Resistance
Capacitance
Te m p e ra t ur e
µA & mA µA mA COM 440 mA/1000 V 30 kA/fast-acting fuse
AACOM11A/1000 V 30 kA/fast-acting fuse
U1251A and U1252A Quick Start Guide

Tilt Stand
Safety Information
Tilt Stand at 60° Tilt Stand at 30°
This meter is safety-certified in compliance with
EN/IEC 61010-1:2001, UL 61010-1 Second Edition
and CAN/CSA 22.2 61010-1 Second Edition,
Category III 1000 V Overvoltage Protection,
Pollution Degree II. Use with standard or
compatible test probes.
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.
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
CAT III
1000 V
Category III 1000 V Overvoltage
Protection
Double insulation
Earth ground
Caution, risk of danger
Caution, risk of electric shock
For further safety information details, refer to the Agilent U1251A and U1252A Handheld
Digital Multimeters User’s and Service Guide.
©Agilent Technologies, Inc. 2006, 2007
Third Edition, 15 October 2007
Agilent Technologies