Fluke NetDAQ 2640A, Service Manual

Page: 36 / 260

NetDAQ
Service Manual
1-20
Table 1-27. 2640A Frequency Sensitivity Specifications
Frequency Measurement Sensitivity (Sinewave)
Frequency Range Minimum Signal Maximum Signal
15 Hz to 70 kHz 100 mV ac rms V<150/300Vrms [1] and Vx Hz<2x10
6
)
70 kHz to 100 kHz 100 mV ac rms 20V ac rms
100 kHz to 200 kHz 150 mV ac rms 10V ac rms
200 kHz to 300 kHz 150 mV ac rms 7V ac rms
300 kHz to 1 MHz Linearly increasing from 150 mV ac
rms at 300 kHz to 2 V ac rms at 1 MHz Linearly decreasing from 7 V ac rms
at 300 kHz to 2 V ac rms at 1 MHz
[1] 300V range applies to channels 1 and 11 only.
2645A Specifications 1-29.
This section includes specifications specific to the 2645A instrument by measurement
function.
2645A DC Voltage Measurement Specifications 1-30.
Tables 1-28 to 1-30 provide 2645A specifications for the dc voltage measurement
function.
Table 1-28. 2645A DC Voltage General Specifications
Specification Characteristic
Input Impedance 100 M
Ω
in parallel with 300 pF maximum for ranges <=3V
10 M
Ω
in parallel with 100 pF maximum for ranges >3V
Normal Mode Rejection 50 dB minimum at 50 Hz/60 Hz +0.1%, Slow Rate
Common Mode Rejection 120 dB minimum at dc, 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance, Slow Rate
80 dB minimum at dc, 60 dB at 50 Hz/60 Hz +0.1%, 1 k
Ω
imbalance,
Medium and Fast Rates
Channel-to-Channel
Crosstalk 120 dB minimum Slow Rate (e.g., 30V dc on channel 1 may cause a 30
µ
V
error on channel 2)
80 dB minimum Medium and Fast Rates (e.g., 1V dc on channel 1 may
cause a 10
µ
V error on channel 2)
Temperature Coefficient 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.
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