A-24. 2645A Dc Voltage Measurement General Specifications - Fluke NetDAQ 2640A User Manual

2645A Specifications
This section includes specifications specific to the 2644A instrument by
measurement function.
2645A DC Voltage Measurement Specifications
Tables A-24 to A-26 provide 2645A specifications for the dc voltage measurement
function.
Table A-24. 2645A DC Voltage Measurement General Specifications
Specification
Input Impedance
Normal Mode Rejection
Common Mode Rejection
Channel-to-Channel Crosstalk
Temperature Coefficient
Accuracy at -20 C
Maximum Input Voltage
Characteristic
100M in parallel with 300 pF maximum for ranges
3V
10M in parallel with 100 pF maximum for ranges
>3V
50dB minimum at 50 Hz/60 Hz +0.1%, Slow Rate
120dB minimum at dc, 50 Hz/60 Hz +0.1%, 1k
imbalance, Slow Rate
80dB minimum at dc, 60 dB at 50 Hz/60 Hz +0.1%,
1k imbalance, Medium and Fast Rates
120dB minimum Slow Rate (e.g., 30V dc on
channel 1 may cause a 30 µV error on channel 2)
80dB minimum Medium and Fast Rates (e.g., 1V
dc on channel 1 may cause a 10 µV error on
channel 2)
For % input: Add 1/10th the 90-day specification
per ºC above 28ºC or below 18ºC.
For floor error (V): add 1/20th the 90-day
specification per ºC above 28ºC or below 18ºC
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.
The lesser voltage of:
50V dc or 30V ac rms from any input terminal to
earth
-or-
50V dc or 30V ac rms from any input terminal to
any other input terminal
Specifications
A
2645A Specifications
A-21.
A-22.
A-17