B-2. 2640A Crosstalk Specifications - Fluke NetDAQ 2640A User Manual

2640A/2645A NetDAQ
Users Manual
Crosstalk from a VAC or frequency signal on a 2640A channel to an adjacent
channel using the slow reading is as shown in Table B-2.
VDC 1 k
Frequency
<100 Hz -120 dB
100 Hz -120 dB
500 Hz -120 dB
1 kHz -100 dB
2 kHz -60
5 kHz .01 mV/V
10 kHz .01 mV/V
20 kHz .05 mV/V
50 kHz .1 mV/V
100 kHz .1 mV/V
>500 kHz .1 mV/V
For frequencies below 5 kHz, the 2640A is roughly 10 times more susceptible to crosstalk at
frequencies that are exact multiples of 300 Hz than it is at the frequencies shown above. e.g., the
sensitivity at 3 kHz will be about 10 times worse than at 2 kHz or 5 kHz.
The above table indicates the amount of crosstalk interference caused by applying VAC to one other
channel. If VAC (or frequency) inputs are applied to multiple channels, multiply the value in the table
by the number of channels with VAC (or frequency) applied.
B-4
Table B-2. 2640A Crosstalk Specifications
Resistance
source
R <20 k
.001%/V
.001%/V
.001%/V
.001%/V
.001%/V
2 2
.005%/V
2 2
.005%/V
2 2
.01%/V
2 2
.01%/V
2 2
.01%/V
2 2
.1%/V
100
R >20 k
.01%/V*M .001 /V
.05%/V*M .001 /V
.05%/V*M .001 /V
.05%/V*M .001 /V
.1%/V*M .001 /V
Not recomm. .001 /V
Not recomm. .01 /V
Not recomm. .01 /V
Not recomm. .01 /V
Not recomm. .01 /V
Not recomm. .01 /V
RTD Thermocouple
.001 /V
.003 /V
.01 /V
.01 /V
2
.01 /V
2 2
.01 /V
2 2
.05 /V
2
Not recomm.
2
Not recomm.
2
Not recomm.
2
Not recomm.