Keysight U1251 User manual

Keysight U1251B and U1252B

Handheld Digital Multimeter

Quick Start Guide

Keysight U1251B and

U1252B Handheld Digital

Multimeter

Quick Start Guide

The following items are included with your multimeter:

If anything is missing or damaged, please contact the nearest Keysight

Sales Office.

✔Silicone test leads ✔Rechargeable 8.4 V battery (for

U1252B only)

✔4 mm probes

✔Alligator clips ✔Power cord and AC adapter (for

U1252B only)

✔Printed Quick Start Guide

✔Certificate of Calibration

✔9 V alkaline battery (for U1251B

only)

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).

WARNING

Ensure the terminal connections are correct for that

particular measurement selection before starting any

measurement. To avoid damage to the device, do not

exceed the input limit.

U1251B and U1252B Quick Start Guide

Charging the Battery

NOTE

For the battery charger, the mains supply voltage should not

fluctuate by plus or minus 10%.

CAUTIONCAUTION

•Do not rotate the rotary switch from position when

charging the battery.

•Perform battery charging only with 7.2 V or 8.4 V NiMH

rechargeable battery, 9 V size.

•Disconnect test leads from all the terminals when charging

the battery.

•Ensure proper insertion of battery in the multimeter, and follow

the correct polarity.

Use the specified accessory, the 24 V DC

adaptor to charge the battery.

1Remove and disconnect the test leads from

the meter.

2Turn the rotary switch to the

position. Connect the power cord to the DC

adapter.

3Plug the Red (+)/ Black (–) banana

terminals of the DC adapter to the

and the COM terminals respectively. The

DC adaptor can be replaced with a DC

power supply in order to set the 24 V DC

output and the over current limitation to a

value more than 0.5 A. Ensure that the

polarity of the connection is correct.

4The primary display indicates “bAt” and

the ‘SbY” flashes on the secondary display

and a short tone sounds to remind you

whether to charge the battery or not. Press

to start charging the battery, or the

meter will automatically start the self-test

after the 24 V supply is applied. We

recommend not to charge the battery if its

capacity is over 90%.

U1251B and U1252B Quick Start Guide

Functions and Features

CAUTIONCAUTION

•Upon initial use (or after a prolonged storage period), the

rechargeable battery may require three to four charge/discharge

cycles before achieving maximum capacity. To discharge, simply

run the multimeter under the rechargeable battery's power until

it shuts down or the low battery warning appears.

•The multimeter may indicate that charging is complete after ten

minutes when charging a new rechargeable battery. This is a

normal phenomenon with rechargeable batteries. Remove the

rechargeable battery from the device, reinsert it, and repeat the

charging procedure.

Action 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 >1 s.

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 > 1 s.

Views the logged data Press for > 1 s, press

to scroll through the logged data.

Clears the logged data Press for > 1 s, press

for >1 s.

U1251B and U1252B Quick Start Guide

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

Temperature

Current (μA and mA) µA.mA COM 440 mA/1000 V 30

kA/fast-acting fuse

Current (A) A COM 11 A/1000 V 30

kA/fast-acting fuse

U1251B and U1252B Quick Start Guide

Performing Voltage Measurements

Measuring AC 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.

Measuring DC voltage

1Set the rotary switch to or .

Ensure that 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. Parameters can be

switched consecutively.

NOTE

For measuring DC voltage from a

mixed signal in DC measurement

mode, ensure that the Filter is

enabled

U1251B and U1252B Quick Start Guide

Using the Filter

1To enter the Setup mode, switch off the

meter, then turn the rotary knob to any

non-OFF position while holding

until you hear a beep. You may release

once you hear the beep.

2Press or to scroll through the menu

items until FiLtE is shown in the secondary

display.

3Press or to enable the Filter.

4Press to save your changes.

5Press and hold until the meter

restarts and returns to its normal operating

mode.

CAUTIONCAUTION

To avoid possible electric shock or per-

sonal 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.

U1251B and U1252B Quick Start Guide

Performing Current Measurements

CAUTIONCAUTION

• 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 (red) and COM (black).

Measuring AC current

1Set the rotary switch to or

. 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.

Measuring DC current

1Set the rotary switch to or

. Ensure that 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.

To perform current measurements, set up your multimeter as shown in the

figure below. For measuring DC current from a mixed signal in DC measure-

ment mode, ensure that the Filter is enabled.

U1251B and U1252B Quick Start Guide

Performing Resistance, Conductance, and

Continuity 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

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