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

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Service Manual
Range
90 mV
300 mV
750 mV*
3V
30V
150/300V**
* The 750 mV range is used internally to the instrument and not user selectable.
** 300V range applies to channels 1 and 11 only.

2640A AC Voltage Measurement Specifications

Tables 1-16 to 1-18 provide 2640A specifications for the ac voltage measurement
function.
Specification
Input Impedance
Maximum Crest Factor
Crest Factor Error
Common Mode Rejection
Maximum Input Voltage
Maximum Volt-Hertz Product
Temperature Coefficient
DC Component Error
1-14
Table 1-15. 2640A DC Voltage Accuracy Specifications
18°C to 28°C
90 Day
Slow Fast
.01%+7 µV .01%+17 µV
.01%+15 µV .01%+30 µV
.01%+40 µV .01%+70 µV
.01%+0.1 mV .01%+0.2 mV
.01%+1.5 mV .02%+3 mV
.01%+15 mV .04%+30 mV
Table 1-16. 2640A AC Voltage General Specifications
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:
300V ac rms from any terminal on channels 1 and 11 to earth.
150V ac rms from any terminal on channels 2 through 10, and 12
through 20 to earth.
300V ac rms from any terminal on channels 1 and 11 to any other
terminal.
150V ac rms from any terminal on channels 2 through 10 and 12
through 20 to any other input terminal.
6
2x10
6
1x10
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.
Accuracy, 3σ + (% input + V)
1 Year
Slow Fast
.013%+8 µV .013%+18 µV
.013%+17 µV .013%+35 µV
.013%+50 µV .013%+80 µV
.013%+0.15 mV .013%+0.2 mV
.013%+1.7 mV .026%+3.5 mV
.013%+17 mV .052%+35 mV
Characteristic
Volt-Hertz product on any range, normal mode input.
Volt-Hertz product on any range, common mode input.
-10°C to 60°C
1 Year
Slow Fast
.042%+18.2 µV .042%+44.2 µV
.042%+39 µV .042%+78 µV
.042%+104 µV .042%+182 µV
.042%+0.26 mV .042%+0.52 mV
.042%+3.9 mV .084%+7.8 mV
.042%+39 mV .168%+78 mV
1-22.