User`s guide

5 Characteristics and Specifications
Electrical Specifications
140 U1273A/U1273AX User’s Guide
Table 5- 3 Diode specifications
Function Range Resolution Accuracy Test current
Diode
3 V
[3]
0.0001 V 0.5% + 5
Approx.
1 mA to 2 mA
Auto
[4]
0.0001 V 0.5% + 5
Approx.
0.1 mA to 0.3 mA
Notes for diode specifications:
1 Overload protection: 1000 V
RMS for short circuits with <0.3 A current
2 Built-in buzzer beeps continuously when the voltage measured is less than 50 mV and beeps once for forward-biased
diode or semiconductor junctions measured between 0.3 V and 0.8 V (0.3 V ≤ reading ≤ 0.8 V).
3 Open voltage for diode: <+3.3 V
DC
4 Open voltage for Auto-diode: <+2.5 VDC and >–1.0 VDC
Table 5- 4 DC current specifications
Function Range Resolution Accuracy Burden voltage
Current
300 μA
[1]
0.01 μA 0.2% + 5 <0.04 V
3000 μA
[1]
0.1 μA 0.2% + 5 <0.4 V
30 mA
[1]
0.001 mA 0.2% + 5 <0.08 V
300 mA
[1][3]
0.01 mA 0.2% + 5 <1.00 V
3 A
[2]
0.0001 A 0.3% + 10 <0.1 V
10 A
[2][4]
0.001 A 0.3% + 10 <0.3 V
Notes for DC 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.