2645A Ac Voltage Measurement Specifications - Fluke 2640A Service Manual

Table 1-29. 2645A DC Voltage Resolution and Repeatability Specifications
Range
3 µV
90 mV
1 µV
300 mV
10 µV
3V
100 µV
30V
50V 1 mV
Table 1-30. 2645A DC Voltage Accuracy Specifications
Range
90 Day
Slow
.01%+20 µV .01%+50 µV
90 mV
.01%+40 µV .01%+90 µV
300 mV
.01%+90 µV .01%+200 µV
750 mV*
3V .01%+.3 mV .01%+.6 mV
30V .01%+4 mV .02%+8 mV
50V .01%+30 mV .04%+60 mV
* The 750 mV range is used internally to the instrument and not user selectable.

2645A AC Voltage Measurement Specifications

Tables 1-31 to 1-33 provide 2645A specifications for the ac voltage function.
Table 1-31. 2645A AC Voltage General Specifications
Specification
Input Impedance
Maximum Crest Factor
Crest Factor Error
Common Mode Rejection
Maximum Input Voltage
Maximum Volt-Hertz Product
Temperature Coefficient
DC Component Error
Resolution
Slow
Accuracy, 3σ + (% input + V)
18°C to 28°C
1 Year
Fast Slow
.013%+23 µV
.013%+49 µV
.013%+105 µV
.013%+.38 mV
.013%+4.9 mV
.013%+40 mV
1 MΩ in parallel with 100 pF
3.0 maximum; 2.0 for rated accuracy
For nonsinusoidal input signals with crest factors between 2 and 3 and
pulse widths >=100 µs, add 0.2% to the accuracy specifications.
80 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 kΩ imbalance, Slow Rate
The lesser voltage of:
30V ac rms from any input terminal to earth.
30V ac rms from any terminal input to any other input terminal.
6
2x10 Volt-Hertz product on any range, normal mode input.
6
1x10 Volt-Hertz product on any range, common mode input.
Linear interpolation between 2 applicable points for temperatures
between 28°C and 60°C, or -10°C and 18°C, e.g., if the applicable
specification at 28°C is 2% and the specification at 60°C is 3%, then the
specification at 40°C is (3%-2%)x(40-28)/(60-28)+2%=2.375%.
The presence of a dc voltage will cause an indeterminate error in the
reading of the ac voltage on the input.
Introduction and Specification
Fast
6 µV
3 µV
30 µV
300 µV
3 mV
Fast Slow
.013%+50 µV .042%+52 µV
.013%+93 µV .042%+104 µV
.013%+220 µV .042%+273 µV
.013%+.64 mV .042%+.78 mV
.026%+9.5 mV .042%+10.6 mV
.052%+64 mV .042%+78 mV
Characteristic
Specifications
-10°C to 60°C
1 Year
Fast
.042%+130 µV
.042%+234 µV
.042%+520 µV
.042%+1.56 mV
.084%+20.3 mV
.168%+156 mV
1-31.
1
1-21