YOKOGAWA FG420, User Manual

Page: 82 / 180

68 IM FG410-01EN
4. BASIC OPERATION
4.4.16 Setting the ramp wave symmetry
The waveform is assumed to be set to [Ramp] (ramp wave). For the waveform setting method,

p.48 .
The symmetry setting unit is % only. Setting and display with time is not possible.
a) Symmetry setting method
1.
Select the [Symm] field and then
press the
ENTER
ENTER key to open
the symmetry input field.
Even if there are several setting
screens, the [Symm] field is always
displayed on the first page.
2.
Select the digit to be changed with the left/right arrow keys, and increment/
decrement the value with the up/down arrow keys or the modify knob. The
change is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press
the
ENTER
ENTER key or the [%] unit key (soft key) to set the input value and reflect it
to the output. If the ENTER key is used, the unit is set to %.
b) Relationship between symmetry and waveform
One waveform cycle changes as follows according to the symmetry setting. A symmetry is expressed
by the amount of the ratios of the first and second rises. Except in the case of 0% symmetry, the phase
zero position is fixed to the 0 amplitude center position.
100% 80% 50% 20% 0%
Phase zero
position.
Phase zero
position.
Phase zero
position.
Phase zero
position.
Phase zero
position.
If it is preferable for the phase zero position to be at the bottom of the waveform, use the bottom
referenced ramp wave of a parameter-variable waveform.

“1.2.7 Other waveform group” in the
Application Instruction Manual
Example of 20% and 80% symmetry
for bottom referenced ramp wave.
Phase zero position.
Symmetry input
field.