How can I compare dynamic data at two different time?

[Omid82]

Hi

I am acquiring signals (dynamic data) from a pressure transducer and I want to compare the pressure at t1 with the pressure at t2 to show the pressure is stable, any possibility to  graph this differential pressure?

Thanks

Omid   

[NitzZ]

Hi omid,

May be this is what you are trying to do.. Have a look at the attached vi.. 

Regards,

Nitz..

(Let me know if this was useful and kudos are welcome:))

[Omid82]

Hi thanks for the Vi I tried to fit in the Vi but it didnot work with the dynamic data that I am using, I've simulated the signal and I attached the VI please have a look

Thanks

Omid

[srikrishnaNF]

Hi omid82,

  I think you cannot compare two dynamic values ,probably  you will get error saying that a type mismatch if you give two dynamic values as input to any comparison function.So better use from ddt function and use as you like.

Thanks and regards,

srikrishnaNF

[Omid82]

Hi srikrishnaNF

thanks for your respond I've tried the ddt function but i could'nt built an array and compare the data, what I am trying to do is get the pressure data every five mintues and minus the previuos data like the data in  table below 

thanks

Omid

time	pressure	pressure difference every 5 min
9:00:00 AM	1000.00
9:05:00 AM	1002.00	2.00
9:10:00 AM	1009.00	7.00
9:15:00 AM	1012.00	3.00
9:20:00 AM	1019.00	7.00
9:25:00 AM	1050.00	31.00
9:30:00 AM	1065.73	15.73
9:35:00 AM	1084.42	18.69
9:40:00 AM	1090.10	5.69
9:45:00 AM	1096.79	6.69

[srikrishnaNF]

Hi Omid82,

  You should use "from DDT" function and configure it for single channel.Please look at the attachment

                                         ...and for configuration look at the attachment.After converting to array,it is as good as the difference between consecutive elements in the array.

Thanks and regards,

srikrishnaNF