I am interfacing Keithley 6220 current source by Labveiw 8.6 through GPIB bus and KUSB 488A. I am using example VI which is provided with Keithley drivers for current sweep. I don’t have any problem in sweeping the current in micro or milliamps. But when try to sweep in nanoampere (even the step level in nanoampere), it shows error message “-222” which stands for “Parameter data out of range”.
Can anybody please help me to resolve this error to sweep in nanoampere (stop level as well as step level in nA). I am herewith attaching the the VI which I am using. Front Panel during run (which shows my controls) and the error message are also been attached.
Thanks in advance
Hi,
Can you start from 100nA, not from 0? or may be from 100fA.
Bobby,
I have solved my problem.. Problem was in the vi declaration.. Thanks for your suggestions.
Hi,
PV Raghavendra Karanth, could you detail your VI declaration problem? Same 222 error code here.
Thanks in advance.
Thank you all for your suggestions.
The error code is related to the VI KE6221 -- Set Wave Amplitude. The current is sent as fractional number, every current below 1uA is interpreted as 0, giving the Error 222 - Out of Range. I've changed the format to scientific, now the 6221 sine wave is working as expected.
PS: The set wave offset value has the same issue.
- Badges
- Science topic
- Similar topics
- Mathematical Sciences
- Control Theory
- Control Systems