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Agilent U1251A and U1252A
Handheld Digital Multimeter
Data Sheet
Features
• 50,000 count dual display
• Up to 0.025% basic DC voltage
accuracy
• True RMS measurement
• J-type and K-type temperature
measurements
• Data storage capability with
optional IR-USB link to PC
• 20 MHz frequency counter
• Programmable square wave
generator
• –20 ° C to +55 ° C operating
temperature
• Safety certified with EN/IEC 610101
Category III 1000 V overvoltage
protection
• Built-In battery charger capability
• Multi function tilt stand
Introduction
The Agilent U1250A series handheld
digital multimeter gives you 4.5 digit
resolution with a 50,000 count full
scale and basic DC voltage accuracy of
up to 0.025%. These features give you
the flexibility to perform quick
validation measurements or perform
tolerance checks and marginal failure
troubleshooting. It also offers true
RMS, dBm, and AC+DC readings to
measure both sinusoidal and nonsinusoidal waveforms accurately.
Versatile functionality
The U1250A series handheld digital
multimeter delivers many features that
you would expect from a benchtop
multimeter. These instruments come
with all the basic measurement
functions and added functionality
needed in today’s changing
maintenance environment such as
temperature measurements, frequency
measurements, 4-20 mA process loop
measurement with % readout, 20 MHz
frequency counter (U1252A only), and
dBm measurements.
More than just a measurement tool
The U1250A series expands users’
capability beyond typical
measurements. These instruments
provide data storage capability which
can be done both manually or
automatedly with the optional PC
interface cable. The accompanying
Agilent Graphical User Interface (GUI)
further extends the potential of these
instruments by allowing you to
customize your data logging needs.
Other features include sophisticated
math functions that allow users to
manipulate the data obtained. The
U1252A can be used as a
programmable square wave generator
that allows you to stimulate electronic
circuits for debugging purposes.
Uncompromising ruggedness and
safety
Use The U1250A series handheld
digital multimeter with confidence in
almost any environment. These
instruments come in a robust package
with shock absorbing overmold and
operate within their rated
specifications from –20 ° C right up to
+55 ° C. Furthermore, these
instruments are rated at Cat III 1000 V
(IEC 61010 Compliant) which allows
you to confidently 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 mains circuits.
Visit our Web for more information on
Agilent’s Handheld Digital Multimeter
at www.agilent.com
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U1251A & U1252A DC SPECIFICATIONS
FUNCTION RANGE RESOLUTION TEST CURRENT/
BURDEN VOLTAGE
VOLTAGE
(1)
50.000 mV 0.001 mV -
500.00 mV 0.01 mV -
1000.0 mV 0.1 mV -
5.0000 V 0.0001 V -
50.000 V 0.001 V -
500.00 V 0.01 V - 0.03+5
1000.0 V 0.1 V -
RESISTANCE
500.00 Ω
5.0000 kΩ
(3)
(3)
0.01 Ω 1.04 mA
0.0001 kΩ 416 µA
50.000 kΩ 0.001 kΩ 41.2 µA
500.00 kΩ 0.01 kΩ 4.12 µA
5.0000 MΩ 0.0001 MΩ 375 nA 0.2+5 0.15+5
50.000 MΩ
(4)
0.001 MΩ 187 nA
500.00 MΩ 0.01 MΩ 187 nA N/A 3+10<200 MΩ/8+10>200 MΩ
500 nS
(5)
0.01 nS 187 nA
CURRENT 500.00 µA0.01 µA 0.06 V (100 Ω)
5000.0 µA0.1 µA0.6 V (100 Ω)
50.000 mA 0.001 mA 0.09 V (1 Ω)
440.00 mA 0.01 mA 0.9 V (1 Ω)
5.0000 A 0.0001 A 0.2 V (0.01 Ω) 0.3+10 0.3+10
10.000 A
(7)
0.001 A 0.4 V (0.01 Ω)
DIODE TEST - 0.1 mV 1.04 mA 0.05 + 5
ACCURACY ± (% of reading + No. of Least Significant Digit)
U1251A U1252A
(2)
0.05+50
0.03+5
0.08+10
0.08+5
1+10
1+20
(6)
0.05+5
0.1+5
(6)
0.1+5
0.05+5
(6)
0.2+5
(6)
0.2+5
0.3+10 0.3+5
0.05+50
0.025+5
0.05+10
0.05+5
1+5
1+10
0.15+5
0.15+5
(2)
(6)
(6)
(6)
(6)
TEMPERATURE AND CAPACITANCE SPECIFICATIONS
FUNCTION THERMOCOUPLE
TYPE
K –200 ~ 1372 ° C/
TEMPERATURE
(8)
J
- 10.000 nF 0.001 nF 1%+8
- 100.00 nF 0.01 nF
CAPACITANCE
- 1000.0 nF 0.1 nF
- 10.000 µF0.001 µF
- 100.00 µF0.01 µF
- 1000.0 µF0.1 µF1 time/sec.
- 10.000 mF 0.001 mF 0.1 times/sec.
- 100.00 mF 0.01 mF 3%+10 0.01 times/sec.
[1] Input impedance: >1 GΩ for 50 mV~1000 mV ranges. For U1251A, input impedance is 10 MΩ (nominal) for 5 V~1000 V ranges. For U1252A, input
impedance is 10 MΩ (nominal) in parallel with 1.1 MΩ 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 Ω and 5 kΩ is specified after NULL function, which is used to subtract the test lead resistance and the thermal effect
[4] For the range of 50 MΩ, the R.H. is specified for <60%.
[5] The accuracy is specified 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 specified 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
MAX. DISPLAY
FULL SCALE
–328 ~ 2502 ° F
–210 ~ 1200 ° C/
–346 ~ 2192 ° F
0.1 ° C/0.1 ° F0.3% +3 ° C/
0.3%+6 ° F
0.1 ° C/0.1 ° F0.3% +3 ° C/
0.3%+6 ° F
N/A N/A
N/A N/A
4 times/sec.
1%+5
11000 counts
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U1251A AC SPECIFICATIONS
FUNCTION
RANGE
50.000 mV 0.001 mV 1+60 0.6+40 1.0+40 1.6+60
500.00 mV 0.01 mV 1+60 0.6+25 1.0+40 1.6+60
TRUE-RMS
AC VOLTAGE
1000.0 mV 0.1 mV 1+60 0.6+25 1.0+25 1.6+40
5.0000 V 0.0001 V 1+60 0.6+25 1.0+25 1.6+40
50.000 V 0.001 V 1+60 0.6+25 1.0+25 1.6+40
500.00 V 0.01 V 1+60 0.6+25 1.0+25
1000.0 V 0.1 V 1+60 0.6+40 1.0+40 N/A
FUNCTION RANGE RESOLUTION
500.00 µA
(2)
5000.0 µA0.1 µA 1.5+40 0.8+20 3+60
AC CURRENT
50.000 mA 0.001 mA 1.5+40 0.8+20 3+60
440.00 mA 0.01 mA 1.5+40 0.8+20 3+60
5.0000 A 0.0001 A
(3)
10.000 A
RESOLUTION
0.01 µA 1.5+50 0.8+20 3+80
0.001 A
U1252A AC SPECIFICATIONS
FUNCTION RANGE RESOLUTION
50.000 mV 0.001 mV 1.5+60 0.4+40 0.7+40 0.75+40 3.5+120
500.00 mV 0.01 mV 1.5+60 0.4+25 0.4+25 0.75+40 3.5+120
TRUE-RMS
AC VOLTAGE
1000.0 m V 0.1 mV 1.5+60 0.4+25 0.4+25 0.75+40 3.5+120
5.0000 V 0.0001 V 1.5+60 0.4+25 0.4+25 0.75+40 3.5+120
50.000 V 0.001 V 1.5+60 0.4+25 0.4+25 0.75+40 3.5+120
500.00 V 0.01 V 1.5+60 0.4+25 0.4+25 1.5+40
1000.0 V 0.1 V 1.5+60 0.4+40 0.4+40
ACCURACY ± (% of reading + No. of Least Significant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 30 kHz
(1)
1.6+40
ACCURACY ± (% of reading + No. of Least Significant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 2 kHz 2 kHz ~ 20 kHz
2+40
2+40
(4)
(4)
0.8+20 3+60
0.8+20
<3 A/5 kHz
ACCURACY ± (% of reading + No. of Least Significant Digit)
FREQUENCY
20 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 20 kHz 20 kHz~100 kHz
(1)
3.5+120
1.5+40
(1)
N/A
(5)
ACCURACY ± (% of reading + No. of Least Significant Digit)
FUNCTION RA NGE RESOLUTION
(2)
0.01 µA 1.0+20 0.7+20 0.75+20 5+80
AC CURRENT
500.00 µA
5000.0 µA0.1 µA 1.0+20 0.7+20 0.75+20 5+80
50.000 mA 0.001 mA 1.0+20 0.7+20 0.75+20 5+80
440.00 mA 0.01 mA 1.0+20 0.7+20 1.5+20 5+80
5.0000 A 0.0001 A
10.000 A
(3)
0.001 A
20 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 20 kHz 20 kHz ~ 100 kHz
(4)
1.5+20
(4)
1.5+20
FREQUENCY
0.7+20 3+60
0.7+20
<3 A/5 kHz
(5)
N/A
[1] The input signal is lower than the product of 20,000,000 V-Hz (product of voltage and frequency).
[2] Input current >35 µArms.
[3] Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specified 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.
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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
500.00 mV 0.01 mV 1.5+65 0.4+30 0.4+30 0.8+45 3.5+125
VOLTAGE
FUNCTION RANGE RESOLUTION
CURRENT
1000.0 mV 0.1 mV 1.5+65 0.4+30 0.4+30 0.8+45 3.5+125
5.0000 V 0.0001 V 1.5+65 0.4+30 0.4+30 0.8+45 3.5+125
50.000 V 0.001 V 1.5+65 0.4+30 0.4+30 0.8+45 3.5+125
500.00 V 0.01 V 1.5+65 0.4+30 0.4+30 1.5+45
1000.0 V 0.1 V 1.5+65 0.4+45 0.4+45
500.00 µA
(3)
0.01 µA 1.1+25 0.8+25 0.8+25
5000.0 µA0.1 µA 1.1+25 0.8+25 0.8+25
50.000 mA 0.001 mA 1.2+25 0.9+25 0.9+25
440.00 mA 0.01 mA 1.2+25 0.9+25 0.9+25
5.0000 A 0.0001 A
10.000 A
(4)
0.001 A
ACCURACY ± (% of reading + No. of Least Significant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 10 kHz 10 kHz ~ 20 kHz 20kHz~100kHz
(2)
3.5+125
N/A
1.5+45
(2)
ACCU RACY ± (% of reading + No. of Least Significant Digit)
FREQUENCY
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 20 kHz
1.8+30
1.8+30
(5)
(5)
0.9+30 3.3+70
0.9+25
<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 µArms.
[4] Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specified 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
(Maximum input for specified
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
MINIMUM SENSITIVITY
20 Hz-100 kHz
(R.M.S. Sine-Wave)
>100 kHz ~ 200 kHz
TRIGGER LEVEL FOR DC COUPLING
< 100 kHz >100 kHz ~ 200 kHz
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U1252A FREQUENCY SENSITIVITY DURING VOLTAGE MEASUREMENT
FREQUENCY SENSITIVITY AND TRIGGER LEVEL FOR U1252A
INPUT RANGE
(Maximum input for specified
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
20 Hz-200 kHz
MINIMUM SENSITIVITY
(R.M.S. Sine-Wave)
>200 kHz ~ 500 kHz
TRIGGER LEVEL FOR DC COUPLING
< 100 kHz >100 kHz ~ 500 kHz
DUTY CYCLE
MODE RAN GE 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 µs and the range of duty cycle should be considered. The range of pulse width is determined by
the frequency of the signal.
(1)
PULSE WIDTH
MODE RANGE ACCURACY AT FULL SCALE
500 ms 0.01 ms 0.2% + 3
2000 ms 0.1 ms 0.2% + 3
(1)
U1251A & U1252A FREQUENCY SENSITIVITY DURING
CURRENT MEASUREMENT
INPUT RANGE
500.00 µA100 µA
5000.0 µA250 µA
50.000 mA 10 mA
440.00 mA 25 mA
5.0000 A 1 A
10.000 A 2.5 A
MINIMUM SENSITIV ITY (R.M.S. Sine-Wave)
20 Hz - 20 kHz
PEAK HOLD (Capturing changes)
SIGNAL WIDTH ACCURACY FOR DC mV/VOLTAGE/CURRENT
Single event > 1 ms
Repetitive > 250 µs
2% + 400 for all ranges
2% + 1000 for all ranges
U1252A FREQUENCY COUNTER SPECIFICATIONS
Divide 1 (secondary display “-1-”)
RANGE RESOLUTION ACCURACY SENSITIVITY MIN. INPUT FREQUENCY
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 200 mV R.M.S.
9.9999 MHz 0.0001 MHz
0.002%+5,
<2 MHz
100 mV R.M.S.
Divide 100 (secondary display “-100-”)
RANGE RESOLUTION ACCURACY SENSITIVITY MIN. INPUT FREQUENCY
9.9999 MHz 0.0001 MHz 0.002%+5,
99.99 MHz 0.001 MHz
<20 MHz
400 mV R.M.S. 1 MHz
600 mV R.M.S.
0.5 Hz
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U1252A SQUARE WAVE OUTPUT
(1)
OUTPUT
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, 1200, 1600, 2400, 4800 Hz
(2)
DUTY CYCLE
PULSE WIDTH
(2)
AMPLITUDE Fixed 0~+2.8 V 0.1 V 0.2 V
[1] Output impedance: 3.5 kΩ maximum.
[2] The positive or negative pulse width must be greater than 50 µs for adjusting the duty cycle or pulse width under different frequency. Else, the accuracy
and range will be different from the definition.
[3] For signal frequencies greater than 1 kHz, an addition of 0.1% per kHz is added to the accuracy.
RANGE RESOLUTION ACCURACY
0.01Hz 0.005% +2
0.39% ~ 99.60% 0.390625%
0.4% of full scale
1/Frequency Range/256 0.2 ms+ Range/256
(3)
OPERATING CHARACTERISTICS
Measuring rate
Function Times/second
ACV 7
ACV + dB 7
DCV 7
ACV 7
AC + DC V 2
Ω/nS
14
Diode 14
Capacitance
4 (< 100 µF)
DCI 7
ACI 7
AC + DC I 2
Te m p e r at u r e 6
Frequency 2 (>10 Hz)
Duty cycle 1 (>10 Hz)
Pulse width 1 (>10 Hz)
DECIBEL (dB) CALCULATION
dB BASE REFERENCE DEFAULT REFERENCE
1 mW (dBm)
1 V (dBV) 1 V 1 V
1-9999 Ω 50 Ω
GENERAL SPECIFICATIONS
DISPLAY
Both primary and secondary displays are 5-digit liquid crystal display (LCD)
with maximum reading 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
Full accuracy at –20 ° C to 55 ° C
Full accuracy to 80% RH for temperature up to 35 ° C, decreasing linearly to 50%
RH at 55 °C
Altitude:
0 - 2000 meters per IEC 61010-1 2
2000 - 3000 meters per IEC 61010-1 2
STORAGE COMPLIANCE
–40 ° C to 70 ° C
SAFETY COMPLIANCE
Certified by CSA for IEC/EN/CSA/UL 61010-1 2
MEASUREMENT CATEGORY
CAT III 1000 V Overvoltage Protection up to 2000 m, Pollution degree 2
EMC COMPLIANCE
Certified 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 kΩ ubalanced)
NORMAL MODE REJECTION RATIO (NMRR)
> 60 dB at DC, 50/60 Hz + 0.1%
TEMPERATURE COEFFICIENT
0.15 x (specified accuracy)
° C (from –20 ° C to 18 ° C or 28 ° C to 55 °C)
SHOCK and VIBRATION
Tested to IEC/EN 60068-2
DIMENSION (HxWxD)
203.5 mm x 94.4 mm x 59.0 mm
WEIGHT
504±5 grams with battery (U1251A)
527±5 grams with battery (U1252A)
CHARGING TIME (only U1252)
<220 minutes approximately at the environment of 10 °C to 30 ° C.
WARRANTY
1 year factory + 2 years extended warranty
nd
Edition CAT III, 1000 V
nd
Edition CAT III, 600 V
nd
Edition
6
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Accessories Included
•Soft carrying case
• Alkaline 9 V battery (U1251A only)
• Rechargeable 7.2 V battery (U1252A only)
• Power cord & AC adaptor (U1252A only)
• U1160A Standard Test Lead Kit
•Quick Start Guide
• Reference CD containing the user’s guide, application
software and instrument drivers
•Certificate of Calibration (CoC)
• Test report
Optional Accessories (Sold seperately)
• U1161A Extension Test Lead Kit
• U1173A IR to USB cable
• U1180A Thermocouple Lead Kit
DIMENSION
7
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Printed on recycled paper
© Agilent Technologies, Inc. 2006
Printed in USA July 31, 2006
5989-5509EN
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