AD2 super high voltage offset

[nanderson]

Hi all,

At some point yesterday, I believe while attempting to get a DD working at the same time as an AD2, my AD2 started seeing a ~25.7v offset on channel 1, with the leads completely floating or even shorted together. I tried re-running calibration but wasn't getting good results. Is there anything that can be done about this, or do I need to reach out to digilent?

[attila]

Hi @nanderson

Probably the input switch got damaged by high voltage, see the following:

 

[nanderson]

On 5/17/2023 at 7:18 AM, attila said:

Hi @nanderson

Probably the input switch got damaged by high voltage

 

Could a static shock have done it? The scope was hooked up to something that was only generating at max 5v output, but I may have accidentally shocked it while standing out of my chair. I'd hope that there would be some sort of protection against that, but that's the only thing I can think of having caused it.

[attila]

Hi @nanderson

I don't think ESD could have caused damage. The first IC on the scope input path have ESD protection diode and the entire device is tested for such.
High voltage inductive or piezo spikes with considerable power could cause damage.

[nanderson]

1 hour ago, attila said:

I don't think ESD could have caused damage.

Then I have no idea what could have caused the damage. The only other thing of note that was going on when the damage occurred was Waveforms freaking out when I tried hooking up a Digital Discovery at the same time as the AD2. 

Since it looks like I'm out of luck for warranty service, do you offer any repair service? I could replace the IC on my own, but would rather not for what's supposed to be a measurement device I trust to have been calibrated by someone with proper equipment. 

[attila]

Hi @nanderson

We don't offer repair services.
Replacing the ADG612 should not require device recalibration, but such can be performed easily with the WaveForms application and good DMM.

On 5/17/2023 at 2:18 PM, attila said:

Probably the input switch got damaged by high voltage, see the following:

 

[nanderson]

Replacing the chip was definitely easier said than done, but it seems to be working again. Thanks for the help, and props for having the device be user serviceable!

[attila]

Hi @nanderson

Glad you were able to fix it.