2

Electrical Specifications

DC specifications

Function

Range

Resolution

Test current/

burden voltage

Accuracy ± (% of reading + counts

of least significant digit)

U1241B

U1242B

1000.0 mV

0.1 mV

–

0.09% + 5

10.000 V

0.001 V

–

0.09% + 2

100.00 V

0.01 V

–

1000.0 V

0.1 V

–

0.15% + 5

Current

1000.0 µA

0.1 µA

< 0.06 V (50 Ω)

0.1% + 3

10000 µA

1 µA

< 0.55 V (50 Ω)

0.1% + 3

100.00 mA

0.01 mA

< 0.18 V (0.5 Ω)

0.2% + 3

0.1 mA

< 0.8 V (0.5 Ω)

0.5% + 3

0.001 A

< 0.4 V (0.01 Ω)

0.6% + 5

0.1 Ω

0.5 mA

0.3% + 3

0.001 kΩ

50 µA

100.00 kΩ

0.01 kΩ

4.91 µA

1000.0 kΩ

0.1 kΩ

447 nA

10.000 MΩ

0.001 MΩ

112 nA

0.8% + 3

0.01 MΩ

112 nA

1.5% + 3

1 V

0.001 V

approximately 0.5 mA

0.3% + 2

1. Input impedance: 10 MΩ (nominal).

2. Current can be measured up to 440 mA continuously. An additional 0.2% needs to be added to the specified accuracy if the signal measured is in the

range of 440 mA to 1100 mA for 30 seconds maximum. After measuring a current of > 440 mA, leave the meter to cool down for twice the measur-

ing time used before applying a low current measurement.

3. Current can be measured up to 10 A continuously with a maximum operating temperature of 50 °C. An additional 0.3% needs to be added to the

specified accuracy if the signal measured is in the range of 10 A to 19.999 A for 15 seconds maximum. After measuring a current of > 10 A, leave the

meter to cool down for 60 seconds before applying a low current measurement.

4. The maximum open voltage is < 2.8 V. For instant continuity, the built-in buzzer sounds when resistance is < 10.0 Ω.

5. The accuracy of 1 kΩ and 10 kΩ is specified after Null function, which is used to substrate the test lead resistance and the thermal effect.

6. For the range of 100 MΩ, the R.H. is specified for < 60%. The temperature coefficient will be 0.15 times of specified accuracy as > 50 MΩ.

7. Overload protection: 1000 V RMS for circuits < 0.3 A short circuit current. The built-in buzzer sounds when reading is approximately below 50 mV and

audible single tone for normal forward biased diode or semiconductor junction as 0.3 V ≤ Reading ≤ 0.8 V.