Agilent
U1251A/U1252A Handheld Digital Multimeter
Data Sheet
Key Features
• 50,000 count dual display
• Up to 0.025% basic DC voltage
accuracy
• True RMS AC, AC+DC
measurements
• J-type and K-type temperature
measurements
• Built-in 20 MHz frequency
counter
• Built-in programmable square
wave generator
Introduction
The Agilent U1250A Series handheld
digital multimeter exceeds your expections of a handheld digital multimeter,
delivering more powerful features
and performance for your applications
needs. The Agilent U1250A series
handheld digital multimeter gives you
4.5 digit resolution with a 50,000 count
full scale in dual display with high
contrast blue backlighting. It takes accurate reading in true-RMS and basic
DC voltage accuracy of up to 0.025%.
These features give you the fl exibility
to perform quick validation measurements or perform tolerance checks
and marginal failure troubleshooting.
the optional PC interface cable. The
accompanying Agilent Graphical User
Interface (GUI) Datalogging software
enable you to customize your datalogging needs and detect anomalies
easily in tabulated or graphical
format. In addition, the U1250A Series
increases your confi dence in fault
fi ndings with its accurate true-RMS
measurements. Other features include
sophisticated math functions that
allow you to manipulate your measurement data and further reduce measurement errors.
Uncompromising ruggedness
and safety
• Manual and automatic data
logging
• Built-In battery charging
capability
• CAT III 1000 V safety protection
• Includes: soft carrying case,
calibration report, data logging
software, test leads, alligator
clips, SMT grabbers, mini
grabber, fi ne tip test probes.
Save cost and space with
4-in-1 capability
The U1250A series Handheld Digital
Multimeter delivers many features
that you would expect from a benchtop multimeter. It is a full-featured
digital multimeter with three added
functionalities that needed in today’s
challenging maintenance environment: frequency counter, waveform
generator and thermometer function.
It saves the most in cost and space,
while giving you the convenience of its
powerful capabilities and features.
Find problem fast
The U1250A Series expands users’
capability beyond typical measurements. These instruments provide data
storage capability which can be done
both manually or automatically with
Use The U1250A Series handheld
digital multimeter with confi dence in
almost any environment. These instruments come in a robust package with
shock absorbing overmold and
operate within their rated specifi cations from –20 oC right up to +55 oC.
Furthermore, these instruments are
rated at Cat III 1000 V (IEC 61010
Compliant) which allows you to confi dently make measurements on building electrical installations, at locations
between the main circuit breaker and
the mains socket-outlets, including
measurements performed on equipment that is permanently connected to
the main circuits.
Visit www.agilent.com for more information on Agilent’s handheld digital
multimeters
2
Agilent U1250A Handheld Digital Multimeter: A sure benefi t for every feature
50,000 count dual display with
true-RMS reading capability
Math functions and SHIFT key
for versatility and convenience
in one single instrument
Broad range of measurement
functions, including
temperature and capacitance
Built-in battery charging
for optimum capacity
Blue LED backlight for better
illumination of display
Data logging capability
20 MHz frequency counter
Programmable square wave
generator for stimulation of
electronic digital circuits
CAT III 1000 V overvoltage
protection
3
U1251A/U1252A DC SPECIFICATIONS
FUNCTION RANGE RESOLUTION TEST CURRENT/
BURDEN VOLTAGE
50.000 mV 0.001 mV - 0.05 + 50
500.00 mV 0.01 mV -
1000.0 mV 0.1 mV -
(1)
VOLTAGE
5.0000 V 0.0001 V -
50.000 V 0.001 V -
500.00 V 0.01 V -
1000.0 V 0.1 V -
RESISTANCE
CURRENT
[3]
500.00 W
5.0000 kW
[3]
0.01 W
0.0001 kW
50.000 kW 0.001 kW
500.00 kW 0.01 kW
5.0000 MW 0.0001 MW
50.000 MW
500.00 MW
500.00 nS
[4]
0.001 MW
[4]
[5]
0.01 MW
0.01 nS 187 nA 1 + 20 1 + 10
500.00 µA 0.01 µA
5000.0 µA 0.1 µA
50.000 mA 0.001 mA
440.00 mA 0.01 mA
5.0000 A 0.0001 A
[7]
10.000 A
0.001 A
1.04 mA 0.08 +10 0.05 + 10
416 µA
41.2 µA
4.12 µA
375 nA
187 nA
187 nA
0.06 V (100 W)
0.6 V (100 W)
0.09 V (1 W)
0.9 V (1 W)
0.2 V (0.01 W)
0.4 V (0.01 W)
DIODE TEST - 0.1 mV 1.04 mA 0.05 + 5
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
U1251A U1252A
[2]
0.03 + 5
0.08 + 5 0.05 + 5
0.2 + 5 0.15 +5
1 + 10 1 + 5
N/A
0.1 + 5
0.2 + 5
[6]
[6]
3+10 < 200 MW / 8+10 > 200 MW
0.3 + 10
0.05 + 50
0.025 + 5
0.03 + 5
0.05 + 5
0.15 + 5
0.3 + 10
0.3 + 5
[2]
[6]
[6]
TEMPERATURE & CAPACITANCE SPECIFICATIONS
FUNCTION THERMOCOUPLE
TYPE
K
TEMPERATURE
[8]
J
CAPACITANCE - 10.000 nF 0.001 nF 1% + 8
- 100.00 nF 0.01 nF
- 1000.0 nF 0.1 nF
- 10.000 µF 0.001 µF
- 100.00 µF 0.01 µF
- 1000.0 µF 0.1 µF 1 time/sec.
- 10.000 mF 0.001 nF 0.1 times/sec.
- 100.00 mF 0.01 nF 3% + 10 0.01 times/sec
[1] Input impedance: >1 GW for 50 mV~1000 mV ranges. For U1251A, input impedance is 10 MW (nominal) for 5 V~1000 V ranges. For U1252A, input impedance is
10 MW (nominal) in parallel with 1.1 MW at dual display.
[2] The accuracy could be 0.05% + 10 for U1251A and 0.05% + 5 for U1252A. Always use NULL function to zero out the thermal effect before measuring the signal.
[3] The accuracy of 500 W and 5 kW is specifi ed after NULL function, which is used to subtract the test lead resistance and the thermal effect
[4] For the range of 50 MW and 500 MW, the R.H. is specifi ed for <60%.
[5] The accuracy is specifi ed for <50 nS and after NULL function with open test lead.
[6] Always use NULL function to zero out thermal effect with open test lead before measuring the signal. If NULL function is not used, an additional 20 counts needs to be
added to the DC current accuracy. Thermal effect could occur due to the following:
• Wrong operation to measure the high voltage of 50 V ~ 1000 V for resistance, diode, and mV measurements.
• After battery-charging has completed.
• After measuring a current greater than 440 mA, it is suggested that the meter be left to cool down for twice the measuring time used.
[7] Current can be measured up to 10 A continuously. An additional 0.5% needs to be added to the specifi ed accuracy if the signal measured is in the range of 10 A~20 A
for 30 seconds maximum. After measuring a current of > 10 A, leave the meter to cool down for twice the measuring time used before application of low current
measurement.
[8] Only available in U1252A.
RANGE RESOLUTION ACCURACY MEASURING RATE AT
FULL SCALE
-200 ~ 1372 ºC/
-328 ~ 2502 ºF
-210 ~ 1200 ºC/
-346 ~ 2192 ºF
0.1 ºC/0.1 ºF
0.1 ºC/0.1 ºF
0.3% + 3 ºC/
0.3% + 6 ºF
0.3% + 3 ºC/
0.3% + 6 ºF
N/A N/A
N/A N/A
4 times/sec.
1% + 5
4
MAX. DISPLAY
11000 counts
U1251A AC SPECIFICATIONS
FUNCTION RANGE RESOLUTION
50.000 mV 0.001 mV
500.00 mV 0.01 mV
TRUE RMS AC
VOLTAGE
FUNCTION RANGE RESOLUTION
AC CURRENT
1000.0 mV 0.1 mV
50.000 V 0.001 V
500.00 V 0.01 V 1.6+40
1000.0 V 0.1 V 0.6+40 1.0+40 N/A
500.00 µA
[2]
0.01 µA 1.5+50
5000.0 µA 0.1 µA
440.00 mA 0.01 mA
5.0000 A 0.0001 A
10.000 A
[3]
0.001 A
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 30 kHz
1.0+60
0.6+40
0.6+25
1.0+40 1.6+60
1.0+25
1.6+405.0000 V 0.0001 V
[1]
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 2 kHz 2 kHz ~ 20 kHz
3.0+80
1.5+40 3.0+60 50.000 mA 0.001 mA
2.0+40(4)
0.8+20
3+60,
<3 A/5 kHz
U1252A AC SPECIFICATIONS
FUNCTION RANGE RESOLUTION
50.000 mV 0.001 mV
500.00 mV 0.01 mV
TRUE RMS AC
VOLTAGE
FUNCTION RANGE RESOLUTION
AC CURRENT
1000.0 mV 0.1 mV
5.0000 V 0.0001 V
50.000 V 0.001 V
500.00 V 0.01 V 1.5+40 3.5+120
1000.0 V 0.1 V 0.4+40 0.4+40 1.5+40
500.00 µA
[2]
0.01 µA
5000.0 µA 0.1 µA
50.000 mA 0.001 mA
440.00 mA 0.01 mA 1.5+20
5.0000 A 0.0001 A
[3]
10.000 A
0.001 A
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 20 kHz 20 kHz~100 kHz
0.4+40 0.7+40
0.75+40 3.5+120
1.5+60
0.4+25 0.4+25
[1]
[1]
N/A
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 20 kHz 20 kHz~100 kHz
1.0+20
0.75+20
5.0+80
0.7+20
1.5+20
[4]
3+60,
<3 A/5 kHz
N/A
[5]
[5]
[1] The input signal is lower than the product of 20,000,000 V-Hz (product of voltage and frequency).
[2] Input current >35 mArms.
[3] Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specifi ed accuracy if the signal measured is in the range
of 10 A ~ 20 A for 30 seconds maximum. After measuring a current of >10 A, leave the meter to cool down for twice the measuring time used before application of
low current measurement.
[4] Input current < 3 Arms.
[5] The additional error to be added as frequency >20 kHz and signal input<10%of range: 3 counts of LSD per kHz.
5
U1252A AC+DC SPECIFICATIONS
FUNCTION RANGE RESOLUTION
50.000 mV 0.001 mV 1.5+80 0.4+60 0.7+60 0.8+60 3.5+220
50.000 mV 0.01 mV
TRUE RMS AC
VOLTAGE
FUNCTION RANGE RESOLUTION
AC CURRENT
50.000 mV 0.1 mV
5.0000 V 0.0001 V
5.0000 V 0.001 V
500.00 V 0.01 V 1.5+45 3.5+125
500.00 V 0.1 V 0.4+45 0.4+45 1.5+45
500.00 µA
[3]
0.01 µA
5000.0 µA 0.1 µA
50.000 mA 0.001 mA
440.00 mA 0.01 mA
5.0000 A 0.0001 A
[4]
10.000 A
0.001 A 0.9+25
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 20 kHz 20 kHz~100 kHz
0.8+45 3.5+125
[2]
N/A
[2]
1.5+65
0.4+30 0.4+30
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 20 kHz
1.1+25 0.8+25 0.8+25
1.2+25 0.9+25 0.9+25
1.8+30
[5]
0.9+30
3.3+70,
<3 A/5 kHz
[1]
U1251A/U1252A FREQUENCY SPECIFICATIONS
[2]
RANGE RESOLUTION ACCURACY MINIMUM INPUT FREQUENCY
99.999 Hz 0.001 Hz
999.99 Hz 0.01 Hz
9.9999 kHz 0.0001 kHz
0.02%+3
<600 kHz
1 Hz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz
[1] The additional error to be added as frequency >20 kHz and signal input <10% of range: 3 counts of LSD per kHz.
[2] The input signal is lower than the product of 20,000,000 V-Hz (product of voltage and frequency).
[3] Input current >35 mArms.
[4] Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specifi ed accuracy if the signal measured is in the range
of 10 A ~ 20 A for 30 seconds maximum. After measuring a current of >10 A, leave the meter to cool down for twice the measuring time used before application of
low current measurement.
[5] Input current < 3 Arms.
U1251A FREQUENCY SENSITIVITY DURING VOLTAGE MEASUREMENT
FREQUENCY SENSITIVITY AND TRIGGER LEVEL FOR U1251A
INPUT RANGE MINIMUM SENSITIVITY
(Maximum input for specifi ed
accuracy = 10 x Range or 1000 V)
50.000 mV 10 mV 15 mV 10 mV 15 mV
500.00 mV 25 mV 35 mV 60 mV 70 mV
1000.0 mV 40 mV 50 mV 100 mV 150 mV
5.0000 V 0.25 V 0.5 V 0.5 V / 1.25 V (< 100 Hz) 0.6 V
50.000 V 2.5 V 5 V 5 V 6 V
500.00 V 25 V N/A 50 V N/A
1000.0 V 50 V N/A 300 V N/A
(R.M.S. Sine-Wave)
20 Hz - 100 kHz >100 kHz ~ 200 kHz < 100 kHz >100 kHz ~ 200 kHz
TRIGGER LEVEL FOR DC COUPLING
6
U1252A FREQUENCY SENSITIVITY DURING VOLTAGE MEASUREMENT
FREQUENCY SENSITIVITY AND TRIGGER LEVEL FOR U1252A
INPUT RANGE MINIMUM SENSITIVITY
(Maximum input for specifi ed
accuracy = 10 x Range or 1000 V)
50.000 mV 10 mV 25 mV 10 mV 25 mV
500.00 mV 70 mV 150 mV 70 mV 150 mV
1000.0 mV 120 mV 300 mV 120 mV 300 mV
5.0000 V 0.3 V 1.2 V 0.6 V 1.5 V
50.000 V 3 V 5 V 6 V 15 V
500.00 V 30 V < 100 kHz N/A 60 V N/A
1000.0 V 50 V < 100 kHz N/A 120 V N/A
DUTY CYCLE
MODE RANGE ACCURACY AT FULL SCALE
DC Coupling 0.01% ~ 99.99% 0.3% per kHz + 0.3%
[1] Positive or negative pulse width must be greater than 10 ms and the range of duty cycle should be considered. The range of pulse width is determined by the frequency
of the signal.
[1]
20 Hz ~ 200 kHz >200 kHz ~ 500 kHz < 100 kHz >100 kHz ~ 500 kHz
(R.M.S. Sine-Wave)
PULSE WIDTH
MODE RANGE ACCURACY AT FULL SCALE
500 ms 0.01 ms 0.2% + 3
2000 ms 0.1 ms 0.2% + 3
TRIGGER LEVEL FOR DC COUPLING
[1]
U1251A/U1252A FREQUENCY SENSITIVITY DURING CURRENT MEASUREMENT
INPUT RANGE MINIMUM SENSITIVITY (R.M.S. Sine-Wave)
500.00 µA 100 µA
5000.0 µA 250 µA
50.000 mA 10 mA
440.00 mA 25 mA
5.0000 A 1 A
10.000 A 2.5 A
20 Hz ~ 20 kHz
PEAK HOLD (Capturing changes)
SIGNAL WIDTH ACCURACY FOR DC mV/VOLTAGE/CURRENT
Single event > 1 ms 2% + 400 for all ranges
Repetitive > 250 µs 2% + 1000 for all ranges
U1252A FREQUENCY COUNTER SPECIFICATIONS
Divide 1 (secondary display “-1-”)
RANGE RESOLUTION ACCURACY ± (% of reading + No. of Least
99.999 Hz 0.001 Hz 0.02% + 3
999.99 Hz 0.01 Hz
9.9999 kHz 0.0001 kHz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz
9.9999 MHz 0.0001 MHz
Signifi cant Digit)
0.002% + 3,
< 2 MHz
SENSITIVITY MIN. INPUT FREQUENCY
100 mV R.M.S.
0.5 Hz
200 mV R.M.S.
Divide 100 (secondary display “-100-”)
RANGE RESOLUTION ACCURACY ± (% of reading + No. of Least
9.9999 MHz 0.0001 MHz
99.999 MHz 0.001 MHz 600 mV R.M.S.
Signifi cant Digit)
0.002% + 5,
< 20 MHz
7
400 mV R.M.S.
SENSITIVITY MIN. INPUT FREQUENCY
1 MHz
U1252A SQUARE WAVE OUTPUT
[1]
OUTPUT
RANGE RESOLUTION ACCURACY
FREQUENCY 0.5, 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80,
100, 120, 150, 200, 240, 300, 400, 480, 600, 800,
0.01 Hz 0.005% + 2
1200, 1600, 2400, 4800 Hz
DUTY CYCLE
PULSE WIDTH
[2]
[2]
0.39% ~ 99.60% 0.390625% 0.4% of full scale
1/Frequency Range/256 0.2 ms + Range/256
[3]
AMPLITUDE Fixed 0 ~ +2.8 V 0.1 V 0.2 V
[1] Output impedance: 3.5 kW maximum.
[2] The positive or negative pulse width must be greater than 50 ms for adjusting the duty cycle or pulse width under different frequency. Else, the accuracy
and range will be different from the defi nition.
[3] For signal frequencies greater than 1 kHz, an addition of 0.1% per kHz is added to the accuracy.
GENERAL SPECIFICATIONS
OPERATING CHARACTERISTICS
Measuring rate
Function Times/second
ACV 7
ACV + dB 7
DCV 7
AC + DC V 2
W /nS
14
Diode 14
Capacitance 4 (< 100 µF)
DCI 7
ACI 7
AC + DC I 2
Temperature 6
Frequency 2 (> 10 Hz)
Duty cycle 1 (> 10 Hz)
Pulse width 1 (> 10 Hz)
DECIBEL (dB) CALCUALTION
dB BASE REFERENCE DEFAULT REFERENCE
1 mW (dBm) 1-9999 W 50 W
1 V (dBV) 1 V 1 V
DISPLAY
Both primary and secondary displays are 5 digit on the LCD display.
Both the primary and secondary displays offer a maximum resolution
of 50,000 counts. Automatic polarity indication.
POWER CONSUMPTION
105 mVA / 420 mVA (with backlit) maximum (U1251A)
165 mVA / 480 mVA (with backlit) maximum (U1252A)
OPERATING ENVIRONMENT
o
Full accuracy at –20
Full accuracy to 80% RH for temperature up to 35 oC, decreasing
C to 55 oC
linearly to 50% RH at 55 oC
Altitude:
0 – 2000 meters per IEC 61010-1 2nd Edition CAT III, 1000 V
2000 – 3000 meters per IEC 61010-1 2nd Edition CAT III, 600 V
STORAGE COMPLIANCE
o
C to 70 oC
–40
SAFETY COMPLIANCE
Certifi ed by CSA for IEC/EN/CSA/UL 61010-1 2nd Edition and
CAN/CSA 22.2 61010-1 2nd Edition.
MEASUREMENT CATEGORY
CAT III 1000 V Overvoltage Protection up to 2000 m, Pollution degree 2
EMC COMPLIANCE
Certifi ed to IEC/EN 61326: 2002, CISPR 11, and equivalents for
Group 1, Class A
COMMON MODE REJECTION RATIO (CMRR)
> 90 dB at DC, 50/60 Hz + 0.1% (1 kW unbalanced)
NORMAL MODE REJECTION RATIO (NMRR)
> 60 dB at DC, 50/60 Hz + 0.1%
Crest Factor
< 3.0
TEMPERATURE COEFFICIENT
o
0.15 * (specifi ed accuracy)/
C (from 20 oC to 18 oC or 28 oC to 55 oC)
SHOCK and VIBRATION
Tested to IEC/EN 60068-2
DIMENSION (WxDxH)
203.5 mm x 94.4 mm x 59.0 mm
WEIGHT
• 504±5 g with battery (U1251A)
• 527±5 g with battery (U1252A)
CHARGING TIME (only U1252A)
< 220 minutes approx. at the environment of 10 oC to 30 oC.
WARRANTY
3 years
8
Accessories included:
• Soft carrying case
• Certifi cate of Calibration (CoC)
• Test Report
• Test leads
• Alligator clips
• SMT grabbers
• Mini grabber
• Fine tip test probes
• Quick Start Guide
• Reference CD containing the
User’s and Service Guide,
application software and
instrument drivers
• Alkaline 9 V Battery (U1251A
only)
• Rechargeable Ni-MH battery with
power adaptor provided (U1252A
only)
Optional Accessories (sold
seperately):
DIMENSION
203.5 mm
• U1161A Extension test lead kit
• U1173A IR to USB cable
• U1180A Thermocouple lead kit
94.4 mm
9
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Printed in USA, April 27, 2007
5989-5509EN
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