keithely 6487 showing output current limit reached even without any voltage applied ...

[ranjini]

I am using two keithley 6487 through labview to scan the voltage for an ion beam deflector. recently one of them started showing cmpl on the front panel ocomp also flashes. all the probes i opened and run it through frontpanel. still the problem persists. tried to update the firmware and it failed to complete updating .
can any one give any clue why this happens. the interlock connector is proper.
this is not a question directly linked with labview but i could not find any other active forum to post the problem. i apologise.
pls help me to recover it.
thanking you
ranjini

[Sappster]

Hi ranjini,

If your device failed during a firmware update, it probably is not in a operable state. I recommend contacting the manufacture to see if they have methods of recovering from a failed firmware update.

Did you receive an error when the upgrade failed?

Here is some information from the manufacturer website:

Known Issues:
When using RS-232 interface, The user may get a timeout error 
at 99% (after instrument resets):
"Timeout Error: Error In Programming Model mmmm!".
This error can be safely ignored.

http://www.keithley.com/support/data?asset=13399

[ranjini]

Dear mark,
Thanks for the reply.
the instrument failed upgrading the firmware since it has gone bad. so i have sent it to keithley.
thanks once again
Ranjini