Synchronization of DAQ assistant and serial.

[RudyL90]

Hello there,

I am trying to measure a signal using the DAQ assistant, aswell as a signal using a multimeter and a rs232 cable. The problem is: if I measure just the signal with the DAQ assistant it goes real time, measuring the signal from the multimeter at the same time gives a delay in the signal from DAQ assistant. I am kind of a rookie with Labview and was hoping one of you guys could help me out. I have attached the .vi.

Thanks a lot for your help in advance.

Kind regards,

Rudy

[crossrulz]

Many DMMs have a trigger line you can use to tell the DMM when to take the measurement.  Same for most of NI's DAQ boards.  So you could wire a digital output line to the trigger inputs for the DMM and the DAQ.  You then write to the digital line to create a trigger pulse.  This will synchronize the DAQ measurements with the DMM via a hardware line.