Table of Contents
Advertisement
Note
ALGorithm:FUNCtion:DEFine
Parameters
Comments
Chapter 7
If <alg_name> specifies an undefined algorithm, ALG:TIME? returns 0. This can be
used to determine whether algorithm <alg_name> is defined.
This command forces algorithms to run internally. If an algorithm contains a run-time
error, no data can be returned and the command will not complete (will "hang").
•
When Accepted: Before INIT only.
•
Returned Value: numeric value. The type is float32
•
Send with VXIplug&play Function: hpe1422_cmdReal64_Q(...)
ALGorithm:FUNCtion:DEFine '<function_name>',<range>,<offset>,
<func_data>
defines a custom function that can be called from within a custom
algorithm. See "Generating User Defined Functions" on page 487 for full information.
Parameter
Parameter
Name
Type
function_name
string
range
numeric (float32)
offset
numeric (float32)
func_data
512 element array of
uint16
•
By providing this custom function capability, the VT1422A's algorithm
language can be kept simple in terms of mathematical capability. This increases
speed. Rather than having to calculate high-order polynomial approximations
of non-linear functions, this custom function scheme loads a pre-computed
look-up table of values into memory. This method allows computing virtually
any transcendental or non-linear function in only 17 µs. Resolution is 16 bits.
•
<function_name> is a global identifier and cannot be the same as a previously
define global variable. A user function is globally available to all defined algorithms.
•
Values are generated for <range>, <offset>, and <func_data> with a program
supplied with the VT1422A. It is provided in C-SCPI and BASIC forms.
For full information, see Appendix F "Generating User Defined Functions" on
page 487.
Range of
Values
valid 'C' identifier
(if not already defined in 'GLOBALS')
see comments
see comments
see comments
VT1422A Command Reference
ALGorithm
Default
Units
none
none
none
none
249
Advertisement
Chapters
Table of Contents
