DAQ Device safety

[Grey]

Hi All,

I'm using analog input channels for acquiring voltage signals from DUT.

If DUT is OK , then i do not have any problem to acquire the signal .

if the DUT has any issues internally then the output voltage will not be in desired amplitude.

Some case i'm afraid it will damage the DAQ device.

in production mode i can expect failures in DUT that may damage the DAQ device.

what normally Test engineers do to overcome this issue?

please advise!

Thanks.

[ShaunR]

Zener diodes.(clipping) Edited February 25, 2012 by ShaunR

[Ton Plomp]

It depends on the DAQ, most DAQs have a measuring rang of +-5 or +-10 Volts, but are protected against higher voltages.

You'll need to detect those higher voltages and act upon.

Another option could be adding signal conditioning that has higher damage criteria (we use dewetron, those go up to 3 kV.

Ton

[Grey]

Thanks ShaunR ..

Reading and co relating the same to my application.

the signals are in DC form

Thanks Ton,

Thanks for the suggestion.

[Tim_S]

I've used 5B modules to perform the isolation. They won't have kV of isolation (more like 50 V), but have been sufficient. Price for a module is about 180 USD and it will need a backplane (something like 300 USD for a 16-slot, less for a single slot) and a 5V power supply. There is ribbon-cable connection options if you are using a E- or M-series card (I think S-series work as well).