Precision Analog Input (Pai) A/D Specifications; Specifications Pai A/D Dc Voltage Measurement - Fluke 2680A Service Manual

Precision Analog Input (PAI) A/D Specifications

This section includes specifications specific to the PAI A/D instrument by measurement
function.

Specifications PAI A/D DC Voltage Measurement

The following tables provide PAI A/D specifications for the dc voltage measurement
function.
Table 1-7. PAI A/D DC Voltage General Specifications
Specification
Input Impedance
Normal Mode Rejection
Common Mode Rejection
Channel-to-Channel Cross talk
Temperature Coefficient
Accuracy at -20 C
Maximum Input Voltage
100 M in parallel with 300 pF maximum for ranges <=3 V
10 M in parallel with 100 pF maximum for ranges >3 V
50 dB minimum at 50 Hz/60 Hz +0.1%, Slow Rate
120 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 k
Rate
80 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 k imbalance, Medium
and Fast Rates
120 dB minimum Slow Rate (e.g., 30 V dc on channel 1 may cause a
30 V error on channel 2)
100 dB minimum Medium and Fast Rates (e.g., 1V dc on channel 1
may cause a 10 V error on channel 2)
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
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.
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
Introduction and Specifications
Precision Analog Input (PAI) A/D Specifications
Characteristic
imbalance, Slow
1
1-11