My task is following: I have a 10 ohm resistor which i need to heat at a particular temperature for certain amount of time. Example; 80 degrees for 30 seconds. I have made a timer program but i have no clue about how to heat the resistor. I tried sending PWM pulses using simulate signal function, but the resistor does not heat up. I connected a led to the same analog ouput which is working fine. Can someone please guide me how to heat up the resistor. The resistor is optimized for 90 degrees at 3 volts.
You didn't mention what HW you use. PWM controlled by PID regulator is right solutions but you can´t connect resistor directly to DO, because the output current is pretty low. You should use a SSR relay and external power supply. Than you can you use e.g. DAQ USB 6009 .
Thanks for the reply. I am using SCB 68 data block for I/O. Yes, you are right, a PID control would be much effective. If i use transistors and pass the voltage output from the AO channel, will i be able to get desired current?
Hi, yes if you use an amplifier and external power supply you will get desired output current. But I don´t understand why you use Analog Output for PWM? Much better is a Digital Output. SCB 68 you mentioned is only connector terminal for DAQ cards, so what DAQ card are you actually using?
OK so I would prefer DO in that case. There are 48ports available on the card but the output current is only 24mA which is to low. So as I mentioned use relay and external supply. Also you should use some thermocouple and AI for feedback loop. Then you can control temperature very precisely.
Thanks a lot Jan. I will take your advice and start working on it. Will let you know what happens. I am fairly new to this so i might ask for guidance from time to time.
