06-05-2021 11:51 AM
Dear Sir/ Madam,
I am using the DAQExpress and i have two kind of input one is analog (Input ,0.5V to 5V ) other is event counter ( PFI0). May i plot the X Y Graph together in DAQExpress software ?
I am using the USB6008 data Data Acquisition Card, how may i reset the counter after 360 count . I am new for LabVIEW software . I have to plot the Pressure and Volume diagram for combustion engine in real time.
May i ask to please share if you have similar example Thanks and looking forward for your reply .
06-05-2021 03:04 PM - edited 06-05-2021 03:05 PM
Hi dk,
@DKPandey wrote:I am using the DAQExpress and i have two kind of input one is analog (Input ,0.5V to 5V ) other is event counter ( PFI0). May i plot the X Y Graph together in DAQExpress software ?
You might get better results when not using the DAQAssistent ExpressVI, but plain DAQmx functions instead...
@DKPandey wrote:I am using the USB6008 data Data Acquisition Card, how may i reset the counter after 360 count . I am new for LabVIEW software . I have to plot the Pressure and Volume diagram for combustion engine in real time.
You might get much better results when using a more powerful DAQ device!
Use DAQ hardware which allows to use the external trigger signal to trigger the sample acquisition!
The USB6008 only allows a start trigger. And it doesn't allow to reset the counter, you need to stop and restart the counter task (or use quotient and remainder operation on the counter value). Additionally the 6008 is rather slow to measure combustion related signals accurately.
06-05-2021 03:39 PM
Dear GerdW,
Thank for your reply , we are doing the student project . May i ask you to please share the some example quotient and remainder operation on the counter value. Even i used the LabVIEW but it is not getting rest , Making the manually reset is really very difficult once engine run (RPM range 600RPM to 800RPM)
I attached one manual reset Vi . May i ask you to please help me how may i rest automatically after count of 360. May i know how to use the plain DAQ option. I have seem only DAQ assistance in the LabVIEW's search option. may i plot the X , Y graph ( PV diagram for engine) in DAQ express because both input is different.
06-06-2021 01:58 PM - edited 06-06-2021 01:59 PM
Hi DK,
@DKPandey wrote:
May i ask you to please share the some example quotient and remainder operation on the counter value.
Quotient&Remainder (QR) is a basic numeric function, found in the numerics palette. It also has a LabVIEW help explanation!
Simple implementation:
@DKPandey wrote:May i know how to use the plain DAQ option. I have seem only DAQ assistance in the LabVIEW's search option. may i plot the X , Y graph ( PV diagram for engine) in DAQ express because both input is different.