Send trigger, wait for two triggers to come back and update analog output Options

[ErikHaverkamp]

Hello,

I am working with LabVIEW 7.1 and the DAQ unit I am using is a USB-DAQ 6211

I have to solve the following problem:

1) AO1 to 0V

2) Send TTL trigger to two external instruments (Keithley 2000's)

3) Wait for both the measurement complete signals of these instruments to come back (TTL)

4) increase AO by 0.01V and go to step 2 (untill AO=5V)

I am running into problems because of the two measurement complete signals, because they really come on different times. And also the triggering of the Analog Output strikes me with troubles, it should be retriggerable but how? Ah and third: the time between the measurements is about 1ms so it should also be relatively fast.

Could somebody give me ideas of where and how to start with this. I am not very experienced in DAQmx (I stopped using LabVIEW at version 5.1). I would already be great if I got some tips of how to handle!

Thanks in advance,

Erik

[RikPrins]

Hello Erik,

As for your trigger problem: there is not a maganism build in our Multifunction I/O hardware devices which lets you trigger on a combination of triggers. You can only react on either a digital edge on one trigger channel or analog triggers from an analog input channel (the last one is not supported on all devices). If you want to react on a combination of triggers you should create some external circuit that generates one digital trigger depending on the other two triggers.

Hope this helps,

Regards,

RikP - National Instruments Applications Engineering