YOKOGAWA FG410, User Manual

Page: 52 / 83

5.1 Generation of Standard Waveform and Numerical Expression Waveform
When the horizontal axis unit is
[Time]
and the cycle is 1 ms, the result of the expression will be
1e-3 = 2* π *0.0001591..., a value that barely changes around the 0 ° of sine wave.
If the vertical axis unit is
[User Unit]
and 0 to 1, the result of the expression will be 1 =
2* π *0.1591..., waveform of about one/sixth of the former half of sine wave.
To create the simplest expression to obtain one cycle of a sine wave, set the horizontal axis unit to
[User Unit]
and the range between 0 and 6.283185.
The
[Y=] value in the numerical expression is affected by the vertical axis unit set on the system
setting screen. “5.6.2 Axis unit setting”
For example, assume that expressions such as
[Y=]
or
[sin(x)]
are used to specify the sine wave.
The value for the sin() function is ±1.
When the vertical axis unit is
[Data]
, the range is between − 32768 and +32767. Therefore, the result
of this expression is a waveform with a very small amplitude close to 0.
When the vertical axis unit is
[Voltage] and the amplitude is 20 Vp-p, the range is ±10, so the result
of this expression is 1/10 of a full-scale sine wave.
When the vertical axis unit is
[User Unit]
and the range is between − 1 and +1, the result of this
expression is a full-scale sine wave.
If the calculation results exceed the ± full-scale range, the waveform is clipped at the ± full-scale
range.
d) Operators
The operators in “Table 5-3 Operators” can be used in the constant input section [Constant] and
numerical expression input section
[Y=]
.
The order of operator priority ranges from top (highest) to bottom (lowest).
The logical operator returns 1 when the condition is true and 0 when the condition is 1.
Table 5-3 Operators
Operator Associativity Remark
( ), function
→
+ - !
←
Monadic operator, ! is a logical operator
^
→
Binary operator, exponential
* /
→
Binary operator, multiplication/division
+ -
→ Binary operator, addition/subtraction
< <= > >=
→
Logical operator, size comparison
== !=
→
Logical operator, Equivalence comparison
&&
→
Logical operator, AND
||
→
Logical operator, OR
IM FG410-61EN
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