LabVIEW DAQ Assistant (NI USB TC-01)

[illusion147]

Hello,

I am trying read temperature data from an NI USB TC-01 on LabVIEW 2021 SP1, through the DAQ Assistant.

The NI USB TC-01 support speeds of up to 4 samples per second.

However, it doesn't let me choose Continuous samples, 1 Sample (HW Timed) or N Samples.

It only lets me choose 1 Sample (On Demand) in the acquisition mode in the DAQ Assistant. 

My final goal is to find the slope/rate of change of temperature values, therein lies the problem:

It give me a dt of 1s when I change the signal to a waveform type and split it into its waveform components.

Its actually supposed to give me a dt of 0.25s shouldn't it, if its speed is 4 samples per second.

I am attaching a screenshot of my block diagram below and I would be really grateful for any help.

Best regards,

Ajay

[ZYOng]

USB-TC01 only supports the software-timed acquisition and does not have any timing engine for hardware-timed finite or acquisition mode.

You can use Wait(ms) function to read data at 0.25, and a shift register to store the data from the previous iteration for differentiation purposes.