User`s guide

5 Characteristics and Specifications
Electrical Specifications
142 U1273A/U1273AX User’s Guide
Table 5- 6 True RMS AC current specifications
Function Range Resolution
Accuracy
Burden voltage
45 Hz to 65 Hz
20 Hz to 45 Hz
[6]
65 Hz to 2 kHz
Current
300 μA
[1][5]
0.01 μA 0.6% + 25 0.9% + 25 <0.04 V
3000 μA
[1][5]
0.1 μA 0.6% + 25 0.9% + 25 <0.4 V
30 mA
[1][5]
0.001 mA 0.6% + 25 0.9% + 25 <0.08 V
300 mA
[1][3]
0.01 mA 0.6% + 25 0.9% + 25 <1.00 V
3 A
[2]
0.0001 A 0.8% + 25 1.0% + 25 <0.1 V
10 A
[2][4]
0.001 A 0.8% + 25 1.0% + 25 <0.3 V
Notes for AC current specifications:
1 Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm fast-acting fuse
2 Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm fast-acting fuse
3 Specification for 300 mA range: 440 mA continuous
4 Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals >10 A to 20 A
for 30 seconds maximum. After measuring currents >10 A, cool down the multimeter for twice the duration of the
measured time before proceeding with low current measurements.
5 U1273AX only: The accuracy for the 300 μA range, 3000 μA range, and 30 mA range is specified after the Null function is
used when measuring at temperatures below –20 °C. The Null function is used to subtract the test lead resistance and
thermal effect (by shorting the test leads).
6 U1273AX only: For all AC current ranges, the accuracy is specified at 2.5% + 25 counts when measuring at below –20 °C
for 20 Hz to 45 Hz AC signals.