Справочник Пользователя для Fluke 2640A

2645A Specifications

A

A-19

Tables A-27 to A-29 provide 2645A specifications for the ac voltage measurement
function.

Input Impedance

1 M

Ω

 in parallel with 100 pF

Maximum Crest Factor

3.0 Maximum
2.0 for rated accuracy

Crest Factor Error

For non-sinusoidal input signals with crest factors
between 2 and 3 and pulse widths 

≥

100 µs, add

0.2% to the accuracy specifications.

Common Mode Rejection

80dB minimum at dc, 50 Hz/60 Hz 

±

0.1%, 1 k

Ω

imbalance, Slow Rate

Maximum Input Voltage

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.

Maximum Volt-Hertz Product

2x10

6

 Volt-Hertz product on any range, normal

mode input.

1x10

6

 Volt-Hertz product on any range, common

mode input.

Temperature Coefficient

Linear interpolation between 2 applicable points for
temperatures between 28

º

C and 60

º

C, or -10

º

C

and 18

º

C, e.g., if the applicable specification at

28

º

C is 2% and the specification at 60

º

C is 3%,

then the specification at 40

º

C is

(3%-2%)x(40-28)/(60-28)+2%=2.375%.

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.

DC Component Error

The presence of a dc voltage will cause an
indeterminate error in the reading of the ac voltage
on the input.