2680A/2686A
Users Manual
A-6
Precision Analog Input (PAI) Module Specifications
This section includes specifications specific to the PAI Module instrument by
measurement function.
Specifications PAI Module DC Voltage Measurement
The following tables provide PAI Module specifications for the dc voltage
measurement function.
Table A-7. PAI 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, 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance,
Medium and Fast Rates
Channel-to-Channel Cross talk
120 dB minimum Slow Rate (e.g., 30 V dc on channel 1 may
cause a 30
µ
V error on channel 2)
100 dB minimum Medium and Fast Rates (e.g., 1V 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 accuracy between -10
°
C and -20
°
C,
interpolate linearly.
Maximum Input Voltage
The lesser voltage of:
300 V from any terminal on channels 1 and 11 to earth;
150 V from any terminal on channels 2 through 10, and 12
through 20 to earth;
300 V from any terminal on channels 1 and 11 to any other
terminal;
150 V from any terminal on channels 2 through 10, and 12
through 20 to any other input terminal
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