The scanner operates with the
Note: The scanner begins on the selected trigger channel and not channel 0 when the start on trigger mode is used with an analog input trigger.
High-Speed Analog Input Triggering
To start or stop conversions, use triggering in the
When using an analog input as the trigger, the start on trigger mode causes the scanner to start on the trigger channel. For example, if the trigger channel is set to 5, the N channel of the 0 to N scanner is set to 7, the return data is as follows:
channel 5 channel 6 channel 7 channel 0 channel 1
...
channel 7 channel 0
...
When using the stop on trigger mode and the trigger is from an analog input channel, the trigger signal is sampled only when the trigger channel is the active scanner channel. Although this allows any channel to be used for triggering, it imposes some restrictions on the characteristic of the trigger signal.
The duration of the trigger signal must be long enough to cause the unit to trigger. Use the following formula to calculate the length of a signal to ensure that the signal is long enough to activate the trigger: (Total channels scanned)/(scan rate in Hz).
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