Electronics > Repair
3458A
Dr. Frank:
If you have used the 3458A between GPIB and direct read-out, esp. if you did any ACAL in between, it's normal that you get different data.
In the CALRAM, a lot of temporary constants are stored as well, not only the basic, fixed gain constants for DCV, OHM and AC.
Please check the Calibration Manual, which constants these are are. There's a list somewhere, at which location you can find these.
Frank
drhex:
@Ian: Have shared a folder with the files. Think the results handling for multi byte returns is not working correctly with the NI GPIB-232CT-A - May give that another look, but it is painfully slow with this interface in the first place...
@Dr.Frank: This could be, did at least one ACAL DCV inbetween the reads. It is massively different though - rhink it is more the above.
drhex:
Trying to run @Tin's X18 script via pyvisa using a NI USBGPIB getting VI_ERROR_IO (-1073807298): Could not perform operation because of I/O error. This is intermittently happening on any request sent - the instrument starts executing and shows no error so must be the response not arriving as expected. Funnily works if executed manually from the python console. Has anyone come across this?
drhex:
And another one: Is ACAL supposed to fail if I have 10V connected?
Kleinstein:
ACAL is not supposed to fail with an external voltage. However it may have a small effect on the accuracy. Here 10 V DC may not be that bad. AC could be more of an issue, especially if not mains frequency. So ideally there is no significant external voltage.
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