2680A/2686A
Users Manual
A-18
Fast Analog Input (FAI) Module Specifications
This section includes specifications specific to the FAI Module instrument by
measurement function.
FAI Module DC Voltage Measurement Specifications
The following tables provide FAI Module specifications for the dc voltage
measurement function.
Table A-22. FAI Module DC Voltage General Specifications
Specification Characteristic
Input Impedance
100 M
Ω
in parallel with 300 pF maximum for ranges <=3 V
10 M
Ω
in parallel with 100 pF maximum for ranges >3 V
Normal Mode Rejection
50 dB minimum at 50 Hz/60 Hz +0.1%, Slow Rate
Common Mode
Rejection
120 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance, Slow
Rate
80 dB minimum at dc, 60 dB at 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance, Medium and Fast Rates
Channel-to-Channel
Crosstalk
120 dB minimum Slow Rate (e.g., 30 V dc on channel 1 may
cause a 30
µ
V error on channel 2)
80 dB minimum Medium and Fast Rates (e.g., 1 V dc on channel 1
may cause a 10
µ
V error on channel 2)
Temperature Coefficient
For % input: Add 1/10th the 90-day specification per
°
C above
28
°
C or below 18
°
C.
For floor error (V): Add 1/20th the 90-day specification per
°
C
above 28
°
C or below 18
°
C.
Accuracy at -20
°
C
Multiply the -10
°
C to +60
°
C accuracy specification by 2. After 1
hour warm-up. For accurate between -10
°
C and -20
°
C,
interpolate linearly.
Maximum Input Voltage
The lesser voltage of:
50 V dc or 30 V ac rms from any input terminal to earth
-or-
50 V dc or 30 V ac rms from any input terminal to any other input
terminal
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