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Inconsistent trigger delays

Question asked by on Jan 4, 2016
I'm trying to measure the time response of a resistance change using a 34420A meter.
I've noticed that sending TRIG:DEL xx gives me insconsistent results.  
I'm using a Labview program to time the execution of 1000 measurements, and then calculating the time/measurement.

If I set my delay to 283 msec, my calculated time/measurement is 291.873 msec.
But if I set the delay to 284 msec, the calculated time/measurement drops to 205.624 msec.

Has anyone run into this?  Any suggestions or explanations?