Multi trigger measurements with a keithley 2100

[maxbonneteymard]

Hi all,

I am using a Keithley 2100 DMM to measure voltages through an USB bus. I am using an agilent multiplexer to route different chanels to be measured by the 2100. A labview software control the two instruments.

If I use a labview  “read single” KE2100 function between each switch of the agilent the program works well. The problem is I would like my measurement to be done faster. So I am trying to store the measurements in the buffer and collect all the data at the end. It goes like this:

1.       Configure the trigger

(sample count=1 , trigger count X, trigger source: bus)

2.       Initiate the trigger (VISA INIT)

3.       Trig the measurement with “*TRG” X time in a for loop

4.       Fetch the data

For some reason I cannot collect these data, I just get one or sometimes two measurements

Does anyone know what the problem is? Many thanks for your help !

PS: enclosed a simple labview version of what I would like to do

[MelanieE]

Hi maxbonneteymard,

you are using VIs from Keithley to configure the DMM. I think, this is a problem you should discuss with Keithley since they develop and provide the VIs and driver for it.

Best regards,

Melanie

[maxbonneteymard1]

Hello Melanie,

I discussed with them indeed and it seems it is not possible to trig from the bus in case you just have a USB bus and not a GPIB one. Therefore I will try  to trig the DMM measurement with the "channel closed output" from the MUX and see if it can work like that.

Best regards,

max

[MelanieE]

Hi Max,

since I guess you use a special driver for the switch, too, could you help me understand what your code exactly does by posting a screenshot of the VI of the switch, too, or post the VIs?

Thank you,

Melanie