Section 7: Introduction to TSP commands
Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference Manual
7-20
DMM7510-901-01 Rev. B / May 2015
Create functions using scripts
You can use scripts to define functions. Scripts that define a function are like any other script: They
do not cause any action to be performed on the instrument until they are executed. The global
variable of the function does not exist until the script that created the function is executed.
A script can consist of one or more functions. Once a script has been run, the computer can call
functions that are in the script directly.
For detail on creating functions, see
Fundamentals of scripting for TSP
(on page 7-4).
Conditional branching
Lua uses the
if
,
else
,
elseif
,
then
, and
end
keywords to do conditional branching.
Note that in Lua,
nil
and
false
are
false
and everything else is
true
. Zero (0) is
true
in Lua.
The syntax of a conditional block is as follows:
if
expression
then
block
elseif
expression
then
block
else
block
end
Where:
•
expression
is Lua code that evaluates to either
true
or
false
•
block
consists of one or more Lua statements
Example: If
if 0 then
print("Zero is true!")
else
print("Zero is false.")
end
Output:
Zero is true!
Example: Comparison
x = 1
y = 2
if x and y then
print("Both x and y are true")
end
Output:
Both x and y are true
