Step 4 Specify Sample Rate

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Step 4 Specify Sample Rate

The sample rate shown in the top right hand corner of WinDaq is a throughput sample rate. The throughput sample rate is the rate that your instrument acquires samples for all channels combined. For example, to acquire two channels of data at 100Hz each would require a sample throughput rate (total scanning rate) of 200Hz (2 channels × 100Hz = 200Hz). The Sample Rate must be specified before recording; default varies.

DI-188 products require you to enter a per channel sample rate when setting the sample rate.

1. In the Edit menu click on Sample Rate.... This displays the sample rate dialog box

2. Enter the desired per channel sample rate in samples per second in the Sample Rate/Channel text box. Click on one of the Set buttons to have WinDaq automatically set your per channel sample rate to the maximum or minimum allowed for your device.

3. Click OK or press the ENTER key.

Please Note: Once the sample rate is specified, WinDaq will send the request to the device, and the device will select a sample best fit for the sample rate and returns the value to WinDaq. This new sample rate is the actual sample rate.

The sample rate per channel is displayed in the lower left corner of the window as S/s/CHAN: (samples per second per channel).

Although thousands of different sample rates may be configured, some discrete rates are not attainable. This limitation is due to the inability to divide the master clock in a manner that results in an even-numbered quotient.

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