measuring response time between supply voltage and operating pressure

[gthompson]

I am trying to display the response time of a solenoid vs pressure on a hydraulic valve, the valve is supplied with 28V and is then pressurized to 3000 psi.  I need labview to measure and display this response time next to or on the waveform chart that has two physical channels in a task in DAQmx.  I am using a 1327 terminal block on an 1125 board for the voltage input and a 1338 terminal block with an 1125 board for the pressure (4-20mA) input.  both of the readings are up and running, I just dont know how to program in the timer. any help would be appreciated.  Even just having a cursor on the chart so i could get accurate readings at each point would work.

[Jarrod_B.]

Hello gthompson,

If you have a waveform graph on your front panel, you can certainly add one or more cursors that would allow you to read values from the graph.  This is easily done by right clicking on the graph, and going to "Visible Items >> Cursor Legend".  Once that is done, you can right-click in the Cursor Legend and use the options under "Create Cursor" to create a cursor. 

I'm not exactly sure what you mean by "program in the timer."  If you are trying to time the rate of acquisition, you can do this by using a hardware-timed task.  With the NI-DAQmx driver, this is easily accomplished by using the DAQmx Timing VI.  You can find good examples of how to program a hardware-timed task in the LabVIEW example finder. 

If I did not answer your question, please provide some further clarification, and I would be glad to help.

Best regards,