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TM178

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  1. 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.
  2. Hi, I am curious if DT9818 has dynamic resolution. The DAQ specifies a fixed resolution of 16-bits. However, this DAQ also offers different input ranges & gains for its analog channels (page73), see excerpt below: Per this recommendation, two of our analog input channels are set to have gain 8 as the signal we are reading comes nowhere near 1.25V (less than 10mV). My question is, especially based on the comment from the excerpt ("... which provides best sampling accuracy for that channel"), is the resolution for our gain 8 channels 0.15mV/bit or 0.019mV/bit? Thanks for your help, I couldn't find anything explicit about this in the data sheet.
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