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When I change both the 2400 & 2182 NPLC settings to 0.01, and set the 2400 so that trigger count=2, arming count=2 & the 2182 so that trigger count=4, the program works perfectly. When I slow down the NPLC settings (to 1) on either piece of equipment OR increase the # of triggers (steps in a sweep), I lose one data point from the 2182. There is a missing output trigger on both the 2400 and the 2182. The missing trigger/data point always seems to occur in the last arming layer.
FYI - the 2400 has the arm layer input on pin 1, trigger layer input on pin 2, & trigger layer output on pin 3. The 2182a is left at its default of trigger layer input on pin 2 & trigger layer output on pin 1. The 2400 pin 2 is connected to the 2182a pin 1 & the 2400 pin 3 to the 2182a pin 2. I am using LabView version 7.1.
I have done further experiments using an oscilloscope to monitor the incoming and outgoing triggers. When I separate the two pieces of equipment, and hook them up to power supplies that can quickly drop from ~3-5 V to ~0-2 V, I see every output trigger I am expecting.
Is there anyway that the input trigger line from the one piece of equipment can have a large voltage/current that effectively hides the output trigger from the other piece of equipment? Any help would be greatly appreciated. I'm kind of stuck until I can figure this trigger problem out. I've included my labview VI below.
Thanks for your help!
- Keithley 2400 2182a Differential Conductance.vi
- (427.46 KiB) Downloaded 1711 times
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