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2635A
Users Manual
A-10
Maximum Voltage Input VS. Frequency Input
See Table A-12.
Table A-12. AC Voltage Measurements
Frequency Maximum Input at Upper Frequency
20 Hz - 50 Hz 300V rms
50 Hz - 100 Hz 300V rms
100 Hz - 10kHz 200V rms
10 kHz - 20 kHz 100V rms
20 kHz - 50 kHz 40V rms
50 kHz - 100 kHz 20V rms
Input Impedance
1 MΩ in parallel with 100 pF maximum Maximum
Maximum Crest Factor
3.0
2.0 for rated accuracy
Crest Factor Error
Non-sinusoidal input signals with crest factors between 2 and 3 and pulse widths 100 µs
and longer add 0.2% to the accuracy specifications.
Common Mode Rejection
80 dB minimum at 50 or 60 Hz ± 0.1%, 1 kΩ imbalance, slow rate
Maximum AC Input
300V rms or 424V peak on channels 0, 1, and 11
150V rms or 212V peak on channels 2 to 10 and 12 to 20
Voltage ratings between channels must not be exceeded
2 x 10
6
Volt-Hertz product on any range, normal mode input
1 x 10
6
Volt-Hertz product on any range, common mode input
DC Component Error
SCAN and first MONitor measurements will be incorrect if the dc signal component
exceeds 60 counts in slow rate or 10 counts in fast rate. To measure ac with a dc
component present, MONitor the input and wait 5 seconds before recording the
measurement.
Cross-Talk Rejection
Refer to Appendix B.