YOKOGAWA FG420, Руководство пользователя

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62 IM FG410-01EN
4. BASIC OPERATION
4.
Once the external addition settings
have been completed, select [OK] in
the lower part of the window and then
press the
ENTER
ENTER key to apply
the external addition setting change
and close the window.
To not change the external addition
setting, select [Cancel] in the lower
part of the window and then press the
CANCEL
ENTER key, or press the
CANCEL
CANCEL key.
c) When the desired external addition condition cannot be selected
When the external addition cannot be set on (×2, ×10 setting)
External modulation is used.
To use external addition, change the modulation source to the internal source.
The external addition input terminal is shared with the external modulation input terminal.
Therefore, when an external modulation source is specified for modulated oscillation except FSK
and PSK, external addition cannot be used. The external addition setting is always [Off] at such
time.
Similarly, when external addition is used, external modulation cannot be used (except FSK, PSK).
When the external addition gain cannot be set to the desired value
The external addition gain is determined by the output voltage range.
To set the external addition gain to ×2, set the amplitude and DC offset so that the output voltage
range is 4 V.
To set the external addition gain to ×10, set the amplitude and DC offset so that the output voltage
range is 20 V.
Since external addition is done at the last stage of waveform output (

p.2 ), the addition gain
is closely related to the output voltage range. When the maximum output voltage of the range is
20 V and 4 V, the addition gain is fixed to ×10 and ×2, respectively. Other addition gain values
cannot be selected.

p.58
Conversely, when external addition is used, the maximum output voltage of the range is fixed
according to the addition gain. It should be noted in particular that when the addition gain is
×10, the maximum output voltage is fixed to 20 V, so that the amplitude accuracy and waveform
quality may decline when the amplitude is made smaller.
Select [OK] and
then press the
ENTER key.