Keysight U1251B Instrucciones de funcionamiento y mantenimiento

Keysight U1251B and

U1252B Handheld

Digital Multimeter

Quick Start

Guide

Contacting Keysight

www.keysight.com/find/assist

(worldwide contact information for

repair and service)

Safety and EMC Information

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, CAT III

1000 V/CAT IV 600 V Overvoltage

Protection, Pollution Degree II. Use

with standard or compatible test

probes.

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 the instrument

manual for specific Warning

or Caution information)

CAT III

1000 V

Category III 1000 V

overvoltage protection

CAT IV

600 V

Category IV 600 V

overvoltage protection

2 Keysight U1251B and U1252B Quick Start Guide

For further safety information details, refer to the

Keysight U1251B and U1252B Handheld Digital Multimeter User’s Guide.

ENGLISH

Keysight U1251B and U1252B Quick Start Guide 3

ENGLISH

The following items are included with your

multimeter:

✔Silicone test leads

✔4 mm probes

✔Alligator clips

✔Printed Quick Start Guide

✔Certificate of Calibration

✔9 V alkaline battery (for U1251B only)

✔Rechargeable 8.4 V battery (for U1252B only)

✔Power cord and AC adapter (for U1252B only)

If anything is missing or damaged, please contact

the nearest Keysight Sales Office.

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.

4 Keysight U1251B and U1252B Quick Start Guide

ENGLISH

Charging the Battery

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.

Keysight U1251B and U1252B Quick Start Guide 5

ENGLISH

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%.

NOTE

For the battery charger, the mains supply voltage

should not fluctuate by plus or minus 10%.

CAUTION

– 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.

– 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.

6 Keysight U1251B and U1252B Quick Start Guide

ENGLISH

Functions and Features

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.

Keysight U1251B and U1252B Quick Start Guide 7

ENGLISH

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

8 Keysight U1251B and U1252B Quick Start Guide

ENGLISH

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.

Keysight U1251B and U1252B Quick Start Guide 9

ENGLISH

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.

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.

NOTE

For measuring DC voltage from a mixed signal in DC

measurement mode, ensure that the Filter is enabled.

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.

10 Keysight U1251B and U1252B Quick Start Guide

ENGLISH

Performing Current Measurements

To perform current measurements, set up your

multimeter as shown in the figure below. For

measuring DC current from a mixed signal in DC

measurement mode, ensure that the Filter is

enabled.

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.

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