2680A/2686A
Users Manual
A-8
PAI Module AC Voltage Measurement Specifications
The following tables provide PAI Module specifications for the ac voltage
measurement function.
Table A-10. PAI Module AC Voltage General Specifications
Specification Characteristic
Input Impedance
1 M
Ω
in parallel with 100 pF
Maximum Crest Factor
3.0 Maximum
2.0 for rated accuracy
Crest Factor Error
For nonsinusoidal input signals with crest factors between 2 and
3 and pulse widths >=100
µ
s, add 0.2% to the accuracy
specifications.
Common Mode Rejection
80 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance,
Slow Rate
Maximum Input Voltage
The lesser voltage of:
300 V ac rms from any terminal on channels 1 and 11 to earth.
150 V ac rms from any terminal on channels 2 through 10, and
12 through 20 to earth.
300 V ac rms from any terminal on channels 1 and 11 to any
other terminal.
150 V ac rms from any terminal on channels 2 through 10 and 12
through 20 to any other input terminal.
Maximum Volt-Hertz Product
2x10
6
Volt-Hertz product on any range, normal mode input.
1x10
6
Volt-Hertz product on any range, common mode input.
Temperature Coefficient
Linear interpolation between 2 applicable points for temperatures
between 28
°
C and 60
°
C, or -10
°
C and 18
°
C, e.g., if the
applicable specification at 28
°
C is 2% and the specification at
60
°
C is 3%, then the specification at 40
°
C is
(3%-2%)x(40-28)/(60-28)+2%=2.375%.
Accuracy at -20
°
C
Multiply the -10
°
C to +60
°
C accuracy specification by 2. After 1
hour warm-up. For accuracy between -10
°
C and -20
°
C,
interpolate linearly.
DC Component Error
The presence of a dc voltage will cause an indeterminate error in
the reading of the ac voltage on the input.
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