3

FUNCTION

RANGE

RESOLUTION

TEST CURRENT/

BURDEN VOLTAGE

ACCURACY ± (% of reading + No. of Least Significant Digit)

U1241A

U1242A

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

W)

0.1% + 3

10000 µA

1 µA

< 0.55 V (50

W)

0.1% + 3

100.00 mA

0.01 mA

< 0.18 V (0.5

W)

0.2% + 3

0.1 mA

< 0.8 V (0.5

W)

0.5% + 3

0.001 A

< 0.4 V (0.01

W)

0.6% + 5

1000.0

0.1

W

0.5 mA

0.3% + 3

10.000 k

0.001 k

W

50 µA

100.00 k

W

0.01 k

W

4.91 µA

1000.0 k

W

0.1 k

W

447 nA

10.000 M

W

0.001 M

W

112 nA

0.8% + 3

100.00 M

0.01 M

W

112 nA

1.5% + 3

1 V

0.001 V

approximately 0.5 mA

0.3% + 2

DC SPECIFICATIONS

[1] Input impedance: 10 M

W (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 current of > 440 mA, leave the meter to cool down for twice the measuring time used before

application of low current measurement.

[3] Current can be measured up to 10 A continuously with the 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 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

W.

[5] The accuracy of 1 k

W and 10 kW is specified after Null function, which is used to substrate the test lead resistance and the thermal effect.

[6] For the range of 100 M

W, the R.H. is specified for < 60%. The temperature coefficient will be 0.15 times of specified accuracy as > 50 MW.

[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.

[8] Input impedance: 10 M

W (nominal) in parallel with <100 pF, with overload protection of 1000 V RMS

[9] Crest factor ≤ 3. For non-sinusoidal waveforms with crest factor up to 3, add 2% reading + 2% full scale typical.

[10] Current can be measured from 50 mA 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 current of > 440 mA, leave the meter to cool down for twice the measuring time used before

application of low current measurement.

[11] Current can be measured from 0.5 A up to 10 A continuously with the 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 low current measurement.

AC SPECIFICATIONS

FUNCTION

RANGE

RESOLUTION

TEST CURRENT/

BURDEN VOLTAGE

ACCURACY ± (% of reading + No. of Least Significant Digit)

40 Hz to 500 Hz

500 Hz to 1 kHz

1 kHz to 2 kHz

TRUE RMS

1000.0 mV

0.1 mV

–

1% + 5

2% + 5

–

10.000 V

0.001 V

–

1% + 5

2% + 5

100.00 V

0.01 V

–

1000.0 V

0.1 V

–

–

TRUE RMS

1000.0 µA

0.1 µA

< 0.06 V (50

W)

1% + 5

1.5% + 5

–

10000 µA

1 µA

< 0.55 V (50

W)

100.00 mA

0.01 mA

< 0.18 V (0.5

W)

0.1 mA

< 0.8 V (0.5

W)

0.001 A

< 0.4 V (0.01

W)