Specifications
2645A Specifications
A
A-17
2645A Specifications A-21.
This section includes specifications specific to the 2644A instrument by
measurement function.
2645A DC Voltage Measurement Specifications A-22.
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 Characteristic
Input Impedance 100MΩ in parallel with 300 pF maximum for ranges
≤3V
10MΩ in parallel with 100 pF maximum for ranges
>3V
Normal Mode Rejection 50dB minimum at 50 Hz/60 Hz +0.1%, Slow Rate
Common Mode Rejection 120dB minimum at dc, 50 Hz/60 Hz +0.1%, 1kΩ
imbalance, Slow Rate
80dB minimum at dc, 60 dB at 50 Hz/60 Hz +0.1%,
1kΩ imbalance, Medium and Fast Rates
Channel-to-Channel Crosstalk 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)
Temperature Coefficient 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
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:
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
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