GW Instek APS-1102 Control Software User Manual User Manual
Page 70
APS-1102 Control Software User Manual
8-6
Constants must be strings other than those shown in “Table 8-4 Built-in Function”. It is
recommended to use strings different from those in “Table 8-2 Built-in Constants”.
When the All Page OK
button is clicked, the constant takes effect on the page where the constant
is defined and subsequent pages.
For example, the constant defined on the first page affects all the pages. The constant defined on the
third page affects the third and subsequent pages, but not the first and second pages.
When the waveform on the displayed page is created with the Page OK button, the constant affects
the displayed page only. For example, the constant defined on the second page does not affect the
first and third pages.
To use the constant on other pages, click the
Compute
button to execute calculation on the page
where the constant is defined in advance.
b) Built-in constants
The constants shown in “Table 8-2 Built-in Constants” were included into “ARB ” at factory.
If the constant defined in “a) constant” has the same name as the built-in constant, the defined value
or expression takes effect.
Table 8-2 Built-in Constants
Name Meaning
Value
Pi Circle
ratio 3.1415926535898
c Light
speed 2.99792458e8
h Planck
constant
6.6260755e-34
k
Boltzmann
constant
1.380658e-23
r Euler
constant 0.57721566490153
c) Functions
Specify a numerical expression in the Y=f (X) format in the numerical expression input section
[Y=].
Here, “X” is a value that varies within the range of the page. For example, when the page range is
1000 to 2000, [X] in the expression changes between 1000 and 2000.
The [X] value in the numerical expression is affected by the horizontal axis unit of the system setting
screen
settings.
“8.5.5 Horizontal axis unit”
For example, assume that expressions such as [Y=] or [sin (x)] are used to specify a sine wave. The
argument for the sin() function is a radian expression.
Assume that the horizontal axis unit is [Address] and the range is between 0 and 8,192. Because
8,192 = 2*
*1303.797..., the result of this expression is a sine wave with approximately 1,304
waves.