Datasheet

14
Supplemental measurement specifications
Measurement Specification
AC+DC
voltage
Measurement method AC+DC coupled true RMS: measures the AC component with up to 400 VDC bias on any range
Crest factor Maximum 3:0 at full scale
Input impedance
U3401A: 1 MW in parallel with <100 pF
U3402A: 1 MW ± 2% in parallel with <120 pF
Maximum input voltage U3401A: 1000 V RMS/1400 V PEAK
U3402A: 750 V RMS/1100 V PEAK
2x10
7
V-Hz product on any range, normal mode input
1x10
6
V-Hz product on any range, common mode input
Overload ranging Selects higher range if peak input overload is detected during auto range. Overload is reported in
manual ranging
Input protection U3401A: 1000 V RMS on all ranges
U3402A: 750 V RMS on all ranges
Response time Approximately 1.5 seconds (2.5 seconds for U3402A) when the displayed reading reaches 99.9% AC
RMS value of the tested input signal at the same range
AC current Measurement method DC coupled to the fuse and current shunt, AC coupled true rms measurement (measures the AC
component only)
Crest factor Maximum 3:0 at full scale
Shunt resistance U3401A
 0.01 W to 100 W for 500 µA to 10 A ranges
U3402A
 0.1 W to 10 W for 10 mA to 1.2 A ranges
 0.01 W for 12 A range
Input protection U3401A
Front panel fuse 630 mA, 500 V; internal 25 A, 440 V
U3402A
mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FH fuse
12 A input terminal: 10 ADC or AC RMS continuous; or 12 ADC or AC RMS for 30 seconds maximum.
Protected with 15 A/600 V, breaking capacity 10,000 A FH fuse
Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested
input signal at the same range
AC+DC
current
Measurement method AC+DC coupled to the fuse and current shunt, AC+DC coupled true rms measurement
(measures the AC component only)
Crest factor Maximum 3:0 at full scale
Measurement range Vdc and Vac are automatically set at the same range
Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested
input signal at the same range
Resistance Measurement method U3401A: 2-wire ohms
U3402A: 2-wire ohms or 4-wire ohms
Open-circuit voltage U3401A: Limited to <+6 VDC
U3402A: Limited to <+5 VDC
Zeroing error
0.05 W or less (excluding test lead resistance) in each range when Relative operation is used