Fluke 2645A, 2640A user manual 20 kΩ

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.

Table B-2. 2640A Crosstalk Specifications

Frequency

VDC 1 kΩ source

Resistance

100Ω RTD

Thermocouple

<100 Hz

100Hz

500Hz

1kHz

2kHz

5kHz

10kHz

20kHz

50kHz

100kHz

>500 kHz

-120 dB

-120 dB

-120 dB

-100 dB

-60

.01 mV/V2

.01 mV/V2

.05 mV/V2

.1 mV/V2

.1 mV/V2

.1 mV/V2

R <20 kΩ

.001%/V

.001%/V

.001%/V

.001%/V

.001%/V

.005%/V2

.005%/V2

.01%/V2

.01%/V2

.01%/V2

.1%/V2

R >20 kΩ

.01%/V*MΩ

.05%/V*MΩ

.05%/V*MΩ

.05%/V*MΩ

.1%/V*MΩ

Not recomm.

Not recomm.

Not recomm.

Not recomm.

Not recomm.

Not recomm.

.001°/V

.001°/V

.001°/V

.001°/V

.001°/V

.001°/V2

.01°/V2

.01°/V2

.01°/V2

.01°/V2

.01°/V2

.001°/V

.003°/V

.01°/V

.01°/V

.01°/V2

.01°/V2

.05°/V2

Not recomm.

Not recomm.

Not recomm.

Not recomm.

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