GPIB/SCPI Keithley 2400 SWEEP_I MEAS V

[sajidsaleem]

Download File:post-6071-1159442948.viDownload File:post-6071-1159442948.viDear Members

I am trying to build a VI for use with the Keithley 2400 Source Meter. My Intention is to Use a Linear CURRENT SWEEP and measure the voltage at each incremental level. Based on the vlaue of read voltage i want to control the direction of ramp i.e up or down.

The attached VI does everything correctly in frame 1 but when in frame 2 READ? is executed(i think 2nd time and thereafter)i get an indication on the Instruemnt

Error Code -410 Query Interupted

The graph does not show any values measured.

Can you please help to resolve the issue.

Regards

Sajid SALEEM

[Mellroth]

I think you are sending commands at a rate that the instrument can't handle.

Try to increase the looptime, or make your program use GPIB interrupts (SRQ).

By using SRQ the instrument can assert the SRQ line when it is ready for the next command.

/J

[wha]

Hi,

don't have time now - but will answer tomorrow morer detailed..........

find attached a pic. - how a Voltage sweep is done with K2400 SMU; the same is
available for Current sweeps.

Regards

Werner

[sajidsaleem]

Dear Group members

My basic problem which i want to solve is................Source a Current ramp and monitor voltage in real time(not at the end of the ramp or cycle), i want to compare the measured voltage against two threshhold voltages(set as constants) and control the direction of ramp(up or down).

I have a new file (attached with this post) which i downloaded from Keithley website. I modified it to work with my 2400. It works fine and sources the ramp and measures the voltage.

PROBLEM is that i get the measured data at the end of the cycle(all 100 or whatever number of points i set) so i cant compare the measured value against my thresholds in real time.

How can i get the measured voltage after every increase/decrease in the source current ramp so that i can then compare the measured voltage and decide when to change the direction of current ramp.

Regards

Ess ESS

Download File:post-6071-1159462530.llb