Specifications

The four Integer input boxes labeled Input 1-4 specify which channels will be
displayed on the strip chart. These are scanned as part of the REPEAT loop that
acquires readings from the VT1419A card. Ten readings for each of the selected
channels are fetched from the FIFO data and sent to the strip chart.
The Cycle Time object allows the rate at which data is placed in the FIFO by the
VT1419A’s C algorithm to be slowed down. The SCPI command
ALG:SCAN:RATIO is used to cause the C algorithm to skip execution intervals
established by the scan triggers. Since the “TRIG:TIMER 0.01" command was
issued during Setup/Configure, this slider will convert to multiples of this rate. For
example, if the 0.04 second Cycle Time is selected, then the C algorithm will only
execute every four scan triggers.
The default 10 ms interval of the scan trigger is also used in Agilent VEE’s strip
chart object. So, if the Cycle Time is left set to 10 ms and the Step size is left to
10 ms, the strip chart data will represent the actual data acquisition time. If the
Cycle Time is modified, the Step on the strip chart should also be modified.
Unfortunately, the Step is not one that can be modified by adding an input terminal
to the object. It can, however, be modified in real-time with a keyboard entry. Keep
in mind that the new step value will be assumed for all previous data too. Therefore,
it’s best to select a rate, program the Step value, and then “RUN” the Agilent VEE
example for the most accurate results.
VEE Programming Examples
Simple Data Logger Example
Chapter 5 165
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