DAQ 6008 output 4-20mA

[Anuar]

Can you attach your VI so I can check how you configured the Scaling and Mapping Express VI?

Regards!

Anuar Rojas

[Firthunands]

Well, just as I said.

At 25°C I want to send the min voltage 3.5v

at 40°C the max voltage, 5v.

Perhaps... my mistake is in the DAQ assistant?, I didn't set any scale in the "custom scale" option, the default "no scale" is active.

[Anuar · Accepted solution]

I am posting the VI with the changes I made to the Scaling and Mapping Express VI.  These changes allow any temperature value below 25°C to output a 0V value, while the range you already defined (3.5-5) still works.

Hope this helps!!

Anuar Rojas

[Firthunands]

Simple and easy... why didn't I think about that? I'll connect everything and check it out.

Thanks mate.

[Anuar]

I'm glad it helped!

You're welcome!

Anuar Rojas

[Firthunands]

Now I'm getting this error... DAQ2 goes to the fan and DAQ3 to light an emergency LED. DAQ1 is my temperature sensor. Is this data incompatibility, or what?

[Anuar]

Hi,

The error occurs due to an incompatibility between the written data and the channels available for this task.  When you configure DAQ Assistant 2 and DAQ Assistant 3, you need to consider the amount of data being supplied (data input) and the numbre of channels you are going to use as output.

Hope this helps!!

Anuar Rojas

[Firthunands]

Thanks, was solved already. 

[HeReL]

Hye,

I have been reading this thread while looking for solutions for my problem, which is kinda same with what Firthunands had.

I want to continuously control my output (12V bulb) to measure the light intensity. I know that I need to use TIP120 to power up the bulb based on the signal sent from my DAQCard. But how's the connection.

I saw samples from the internet, but mostly use PWM as their signal to the TIP120. I understand the concept but I am using LabView v6i with PCI6024E, and I afraid that PWM is not an option for me. Am I right?

Can I directly send my 1-5V from AO of DAQCard to the base of TIP120? Collector to the 12V battery and Emitter to the ground.

[johnsold]

You also need a resistor in series with the base.  Connecting the base directly to the AO would not work the way you want.

Lynn