need help for writing an own pulse script

[blackrose]

Hello,

i want to generate a simple current pulse with my keithley 2602A, but i have a problem with the pulsewidth.
I observed the length of the pulse on an oscilloscope and it's nearly constant for about four times and then, the next time it takes about 40 seconds longer.

I wrote the following script:

smua.measure.rangev = 6.000000
smua.measure.rangei = 1.000000
smua.source.rangev = 6.000000
smua.source.rangei = 1.000000

smua.sense = 1.000000

ntimes = 100000.000000
smua.source.func = smua.OUTPUT_DCAMPS

smua.source.leveli = 0.186000
smua.source.limiti = 0.200000
smua.source.limitv = 5.000000

mybuf = smua.makebuffer(2)
mybuf.clear()
mybuf.appendmode = 1

smua.measure.count = 1

smua.source.output = 1
for i = 1 , ntimes do -- Perform following command(s) ntimes
end --for
smua.measure.i(mybuf)
smua.measure.v(mybuf)
smua.source.output = 0



I figured out, that the problem is in smua.measure.X and not in the loop.

Could you please help me?

[Dennis_Knutson]

This board is for NI DMMs and the script language it's from Keithley. Shouldn't you be asking them?

[Rikud]

Definitely the wrong forum.

The forum you arre looking for can be found here:

http://forum.keithley.com

[blackrose]

Ok, thanks!