Agilent Technologies U1251A Bedienungsanleitung

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

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

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