Datasheet

15
Supplemental measurement specifications
Measurement Specification
Resistance
Input protection 500 V
Response time U3401A
 Approximately 1.5 seconds for 5 MW and ranges below 5 MW
U3402A
 Approximately 1.5 seconds for 12 MW and ranges below 12 MW
 Approximately 5 seconds for 40 MW
 Approximately 10 seconds for 120 MW
 Approximately 23 seconds for 300 MW
Diode/
Continuity
Measurement method 0.83 mA ± 0.2% constant current source; open-circuit voltage limited to <5 V
Test current Approximately 0.5 mADC
Open-circuit voltage U3401A: Limited to <+6 VDC
U3402A: Limited to <+5 VDC
Continuity threshold
10 W fixed
Continuity level Approximately <+50 mVDC
Audible tone Continuous beep for continuity and single tone for normal forward-biased diode or semiconductor
junction
Input protection 500 V
Resistance/
Continuity
(U3402A
only)
Measurement method 2-wire ohms
Test current Approximately 0.5 mADC
Open-circuit voltage Limited to <+5 VDC
Audible tone Continuous beep for continuity and single tone for normal forward-biased diode or semiconductor
junction
Zeroing error
0.05 W or less (excluding test lead resistances) in each range when Relative operation is used
Input protection 500 V
Frequency Measurement method Reciprocal counting technique. AC coupled input using AC voltage function
Crest factor Maximum 3:0 at full scale
Signal level 10% of range to full-scale input on all ranges; auto or manual range selection
Gate time 0.1 second or 1 period of the input signal, whichever is longer
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
Input protection 750 V RMS on all ranges
Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% of frequency value
Noise
rejection
Common mode rejection
ratio (CMRR) for 1 kW
unbalanced LO lead
50/60 Hz ± 0.1%: DC >90 dB
Normal mode rejection
ratio (NMRR)
50/60 Hz ± 0.1%: >50 dB