Agilent Technologies U1251B User manual

Agilent Technologies
Agilent U1251B and U1252B
Handheld Digital Multimeter
Quick Start Guide
The following items are included with your multimeter:
✔Silicone test leads , 19 mm probes , 4mm probes ,
and alligator clips
✔Printed Quick Start Guide
✔9 V alkaline battery (for U1251B only)
✔Rechargeable 7.2 V battery (for U1252B only)
✔Power cord and AC adapter (for U1252B only)
✔Certificate of Calibration
If anything is missing or damaged, please contact the nearest Agilent Sales
Office.
For more detailed information, please refer to the Agilent U1251B and
U1252B Handheld Digital Multimeter User’s and Service Guide on Agilent
Web site (www.agilent.com/find/handheld-tools).
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
Functions and Features
Input Terminals and Overload Protection
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.
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 pe r at u re
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. Parameter can be switched
consecutively.

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.

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

U1251B and U1252B Quick Start Guide
Performing Capacitance and Temperature
Measurements
Capacitance
1Set the rotary switch to .
2Connect the red and black test leads to
input terminals (red) and COM
(black) respectively.
3Connect the red test lead to the positive
terminal of the capacitor, and the black test
lead to the negative terminal.
4Read the display.
Temperature
1Set the rotary switch to . Press
to select temperature
measurement.
2Plug the thermocouple adapter (with the
thermocouple probe connected to it) into
input terminals (red) and COM (black).
3Touch the measurement surface with
the thermocouple probe.
4Read the display.

U1251B and U1252B Quick Start Guide
Frequency and Frequency Counter
Measurements
WARNING
• Use the frequency counter for low voltage applications.
Never use the frequency counter on AC power line
systems.
• For input more than 30 Vpp, you are required to use
frequency measurement mode available under the
current or voltage measurement instead of frequency
counter.
Frequency Measurement
During AC/DC voltage or AC/DC current
measurements, you can measure the signal
frequency by pressing at any time.
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 985 kHz.
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 division of input signal
frequency by 100. This accommodates a
higher frequency range of up to 20 MHz.
6The signal is out of range if the reading is
still unstable after step 5.

U1251B and U1252B Quick Start Guide
Square Wave Output (for U1252B only)
NOTE
Pressing is the same as pressing .
1Turn the rotary switch to . 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
the 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%.

First Edition, December 1, 2009
© Agilent Technologies, Inc., 2009
Agilent Technologies
When Charging the Battery...
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.
Safety Notices Safety 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 Symbols
CAUTIONCAUTION
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.
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)
Category III 1000 V
overvoltage protection
Category IV 600 V
overvoltage protection
CAT III
1000 V
CAT IV
600 V
For further safety information details, refer to the
Agilent U1251B and U1252B Handheld Digital Multimeter
User’s and Service Guide.
Printed in Malaysia
U1251-90046