4
FUNCTION RANGE RESOLUTION TEST CURRENT/
BURDEN VOLTAGE
ACCURACY ± (% of reading + No. of Least Signifi cant Digit)
U1251A U1252A
VOLTAGE
(1)
50.000 mV 0.001 mV - 0.05 + 50
[2]
0.05 + 50
[2]
500.00 mV 0.01 mV -
0.03 + 5
0.025 + 5
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 W
[3]
0.01 W
1.04 mA 0.08 +10 0.05 + 10
5.0000 kW
[3]
0.0001 kW
416 µA
0.08 + 5 0.05 + 5
50.000 kW 0.001 kW
41.2 µA
500.00 kW 0.01 kW
4.12 µA
5.0000 MW 0.0001 MW
375 nA
0.2 + 5 0.15 +5
50.000 MW
[4]
0.001 MW
187 nA
1 + 10 1 + 5
500.00 MW
[4]
0.01 MW
187 nA
N/A
3+10 < 200 MW / 8+10 > 200 MW
500.00 nS
[5]
0.01 nS 187 nA 1 + 20 1 + 10
CURRENT
500.00 µA 0.01 µA
0.06 V (100 W)
0.1 + 5
[6]
0.05 + 5
[6]
5000.0 µA 0.1 µA
0.6 V (100 W)
50.000 mA 0.001 mA
0.09 V (1 W)
0.2 + 5
[6]
0.15 + 5
[6]
440.00 mA 0.01 mA
0.9 V (1 W)
5.0000 A 0.0001 A
0.2 V (0.01 W)
0.3 + 10
0.3 + 10
10.000 A
[7]
0.001 A
0.4 V (0.01 W)
0.3 + 5
DIODE TEST - 0.1 mV 1.04 mA 0.05 + 5
U1251A/U1252A DC SPECIFICATIONS
TEMPERATURE & CAPACITANCE SPECIFICATIONS
FUNCTION THERMOCOUPLE
TYPE
RANGE RESOLUTION ACCURACY MEASURING RATE AT
FULL SCALE
MAX. DISPLAY
TEMPERATURE
K
-200 ~ 1372 ºC/
-328 ~ 2502 ºF
0.1 ºC/0.1 ºF
0.3% + 3 ºC/
0.3% + 6 ºF
N/A N/A
J
[8]
-210 ~ 1200 ºC/
-346 ~ 2192 ºF
0.1 ºC/0.1 ºF
0.3% + 3 ºC/
0.3% + 6 ºF
N/A N/A
CAPACITANCE - 10.000 nF 0.001 nF 1% + 8
4 times/sec.
11000 counts
- 100.00 nF 0.01 nF
1% + 5
- 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.
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