Need help for writing an own pulse script

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?

Definitely the wrong forum.
The forum you arre looking for can be found here:
http://forum.keithley.com

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