2680A/2686A
Users Manual
A-20
FAI Module AC Voltage Measurement Specifications
The following tables provide FAI Module specifications for the ac voltage
function.
Table A-25. FAI 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:
30 V ac rms from any input terminal to earth.
30 V ac rms from any terminal input 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.
Table A-26. FAI Module AC Voltage Range and Resolution Specifications
Range
Resolution
Minimum Input for
Slow
Fast
Rate Accuracy
Full Scale
+30,000 +3,000
300 mV
10
µ
V 100
µ
V 20
mV
3 V
100
µ
V
1 mV
200 mV
30 V
1 mV
10 mV
2 V
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