Triggering and Recording for specific duration

Question

Enclosed is the VI which I am using to trigger a electrical circuit for generating a spark.
My system is very simple wherein I am generating spark in a vessel (by a triggred electrical pulse to HV generator) and measuring the pressure and temperature for a specified time of X and Y seconds after the spark.
Part A:
On a single Boolean input (TRUE) I would like to have following:  
1. The Trigger pulse (USB 6009 device) should start and last for say 1.5 sec. which is input to my electrical circuit. Two DAQ max is used since current from one port is not sufficient to trigger the HV generator - electrical circuit.
2. At the same time the pressure inside the vessel should be recorded for X sec. only (writing to file)
3. Simultaneously the temperature should also be recorded for Y sec. only (writing to file)
In the present VI, I have to keep the “Auto fire and record” button pressed to write the data to file. I have set up preset time for the trigger pulse.
After triggering and recording for specific time 1.5, X and Y sec. the Boolean should go to FALSE position since long duration pulse to electrical circuit can be damaging.
*** REQUEST SOME-ONE HELP ON THIS MATTER ASAP. ****
Part B:
Later I have to record the values of current and voltage measured at three locations by Tektronix TDS 3034B Scope (channel 1, 2  and 3) for a duration of 300 nano-seconds after the spark has occurred (i.e. say P sec. after trigger pulse and recording till P + 300 duration)
This simple logic seems to be more difficult than, I expected, can some one please help
/ suggest in the right direction. (**VI attached**)
Sorry for the language – New to Labview and not an electrical engineer. So pl. explain.
THANKS
Email: [email protected]

Answer 1

Hi xseadog,
Sincere apologies for inordinate delay in reply.
Was blocked up with actually setting up the experiment in physical sense. Keeping all the bits and pieces in right place.
The pressure sensor / transducer is Omega PX219 with output 0 – 5 V. Recording pressure reading every 0.001sec. immediately after the spark trigger (USB 6009 signal) is switched ON. (through labview)
The temperature is K type thermocouple. Recording temp every 1/12 sec.(0.0833 sec) after spark.
I have made a provision to trigger the spark manually – through push button. But this mode requires me to start recording press and temp., before pushing the button to generate spark. Hence keen on using the trigger initiated through Labview.
Regarding relay controlled by the 6009, I understand that circuit is similar to that. The HV is generated through an EHT pulse generator, which is ready now, the only thing is it requires a trigger of 5 V and more than 10 mA.
Manually when we generate spark, we do not require the USB 6009, so we get spark every time when button is pushed, it was only during the Labview trigging we diagnose this prob. And hence clubbed the two channels of 6009.
As of now the loop time “Auto fire and record” which is the key for firing –spark generation –runs every 1.011 sec. can you suggest, how to reduce the loop time ?.
Does the DAQ’s consumes time or which step consumes more time. I would request your comments.
Thanks for the continuous help / replies.
nnnsh