VXI VT1419A Multifunction Plus, Руководство пользователя

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·
Values are generated for < range >, < offset >, and < func_data > with the
Agilent VEE program “ fn_1419.vee ” supplied with the VT1419A. See
Appendix E “Generating User Defined Functions” for background information.
·
The <range > and < offset > parameters define the allowable input values to the
function (domain). If values input to the function are equal to or outside of
(±<
range >+< offset >), the function may return ±INF in IEEE-754 format. For
example, < range > = 8 (-8 to 8), < offset > = 12. The allowable input values must be
greater than 4 and less than 20.
·
The < func_data > parameter is a 512 element array of type uint16.
·
The algorithm syntax for calling is: < function_name >
(
< expression >
)
. for
example:
O136 = squareroot( 2 * Input_val );
·
Functions must be defined before defining algorithms that reference them.
·
When Accepted: Before INIT only
.
Usage
ALG:FUNC:DEF ‘F1’,8,12,< block_data > send range, offset, and table values for
function F1
ALGorithm:OUTPut:DELay
ALGorithm:OUTPut:DELay <
delay
>
sets the delay from Scan Trigger to start of
output phase.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
delay numeric (float32) 0 - 0.081 | AUTO (2.5 µ s resolution) seconds
Comments
·
The algorithm output statements (e.g. O136 = Out_val) DO NOT program outputs
when they are executed. Instead, these statements write to an intermediate Output
Channel Buffer which is read and used for output AFTER all algorithms have
executed AND the algorithm output delay has expired (see Figure 6-1). Also note
that not all outputs will occur at the same time but will take approximately 10
µ s
per channel to write.
·
When
<
delay > is 0, the Output phase begins immediately after the Execute
Algorithms phase. This provides the fastest possible execution speed while
potentially introducing variations in the time between trigger and beginning of the
Output phase. The variation can be caused by conditional execution constructs in
algorithms or other execution time variations.
VT1419A Command Reference
ALGorithm
198 Chapter 6
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