DT9818 Acquisition Rate per Channel

[TM178]

Hi, I'm trying to understand the true acquisition rate per channel in our system.

From page 69, I understand that the set acquisition rate of the device is divided down per the channels used:

 

Our configuration (via LabVIEW):

3AI, 1AO

Analog Inputs:

• We create AIN tasks for Channels 0-2 (differential)
• Range +/-10V
• Channels 1 & 2 have gain set to 8; Channel 0 has gain set to 1
• Timing is setup as:
  • Internal Clock
  • Continuous Samples
  • Sample Frequency 12kHz
  • Samples per channel: 1200
  • Number of buffers: 100 (I would like to note that I was unsure of number of buffers as a setting and welcome any feedback in that regard)
• We periodically read this data DtOlReadMultiple2D which provides 1200 data points for each channel

Analog Outputs:

• We create AOUT tasks for Channel 0
• Range +/-10V
• No explicit timing setup, we simply start the task
• When needed, we issue a 1Chan 1Sample command to write to our output via Channel 0 (we apply 0/5V to a magnetic door lock)

I want to confirm that the AO does not count toward the input channel-gain list count and that we have a total of 3 inputs within this input channel-gain list (Ch 0 - gain 1, Ch 1 - gain 8, Ch 2 - gain 8). Meaning the sample rate for each of those inputs is 12000/3 = 4kHz.

 

Thank you for your help.

[Fausto]

Hello @TM178 .

You are correct. The sample rate for each of those analog input channels is 12000/3 = 4kHz.  The analog output channel is not included in the input channel-gain list.

Regards, 

Fausto