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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
02-01-2019 05:20 PM
I have two PXIe-4137 modules (SMU) in a single chassis with an 8840 controller. I would like to set a delay between the two (roughly 6.8 ms). The first SMU is to be triggered via software for DC voltage (multiple measurements for 40 ms). The second one is to perform a Pulse Voltage measurement (50 volts, 1.5 amp). I can configure the two SMU tasks and route a trigger such that they start at approximately the same time (measure trigger from SMU1 to SMU2), but I can't seem to delay the pulse event. There does not appear to be a Pulse Voltage parameter for a delay between the "pulse start trigger" and the rise of the pulse. Is there a way to delay the routed trigger? Would I need a third module to handle the timing between the two?
I'm not sure i can achieve the necessary delay with two separate software triggers.
02-01-2019 07:36 PM
Can you just set both tasks to be trigered with different trigger delays? There's a DAQmx Trigger property node where you can set the delay value. See below.
-Kevin P
02-04-2019 09:41 AM
That looks interesting, but a NI-DCPower instrument handle can not be wired to a DAQmx property node. How would I go about this using NI-DCPower?
02-07-2019 02:40 PM - edited 02-07-2019 02:56 PM
Is this not possible with simple trigger routing between two SMUs to set a delay between the two? Or did I define the target function poorly?
This is something I need to accomplish as I need a pulsed output for the voltage/current ranges required. Do I need additional hardware?
In case I simply explained poorly, here is a crude diagram of the timing I'm trying to achieve.
02-07-2019 04:38 PM
Anyone else out there? I'm no help on this one as I've never used any of the "NI-DCPower" family of instruments.
-Kevin P