USB-6001 AIGND DGND and the USB GND

[johndoe_1987]

Hello.

Is the diffrent ground on the USB-6001 DAQ are isolated from each other?

im intrested espacilly in the AGNDD and DGNd are they isolated from each other?

and are they isolated from the USB supply GND?

i couldn`t find the answer in the spec nor the user guide.

have a great day, and thanks in advance

[ZYOng]

Usually, the AI and DIO ground are connected to the chassis ground, unless the datasheet mentions something else explicitly.

Isolation from the Chassis Ground for NI DAQ Hardware

There is no isolation for low-cost DAQ like USB-6001.

[santo_13]

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@johndoe_1987 wrote:

Hello.

Is the diffrent ground on the USB-6001 DAQ are isolated from each other?

im intrested espacilly in the AGNDD and DGNd are they isolated from each other?

and are they isolated from the USB supply GND?

i couldn`t find the answer in the spec nor the user guide.

have a great day, and thanks in advance

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As long as you don't see the word "isolated" in the datasheet, all grounds are internally tied up eventually.

[crossrulz · Accepted solution]

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@johndoe_1987 wrote:

im intrested espacilly in the AGNDD and DGNd are they isolated from each other?

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There is a simple way to check: use a DMM to check the continuity between AGND and DGND.  I have not used this specific model, but generally speaking for DAQ boards the AGND and DGND use their own planes in the board and then are connected at a single point (usually a single via).  With other boards I have used, these also had a single point connection to chassis ground as well, which would be the USB GND in this case.