NF FRA5087, Instruction Manual

Page: 85 / 194

4.5 Oscillator setting
FRA5087
4-11
0V
AC OFF AC/DC ON
0V
AC OFF AC/DC ON
AC OFF AC/DC ON
0V
[STOP MODE]
[ZERO]
[HOLD]
[PHASE]
SLOW
at "off" status
0V
AC OFF AC/DC ON
[STOP MODE]
[ZERO]
ON/OFF MODE SLOW
START/STOP PHASE
Fig. 4-7 Oscillator stop mode
The oscillator output is the same for [HOLD] and [PHASE] regardless of the setting for
[ON/OFF MODE SLOW].
The starting phase at the time of pressing the AC OFF key in the [HOLD] mode and also
the starting phase at the time of pressing the AC/DC ON key in the [PHASE] mode,
individually, are the phase right before the key actions, but not the phase that has been set
by the [START/STOP PHASE] setting.
[START/STOP PHASE]
This is used to set the phase of the oscillator output with which the oscillator start to
produce, or stop producing, the output waveform. This setting is valid when the [STOP
MODE] is set at [PHASE]. Note, however, that the phase of the output waveform at the
start or stop of frequency sweep is nothing to do with this setting. The phase setting by
[START/STOP PHASE] is valid or effective only when both the AC and DC are off.
The phase is defined assuming that the oscillator output waveform is sinusoidal.
Therefore, the setting of 90 deg. in phase means the maximum amplitude in the positive
phase region, for example.
[WAVE FORM]
This is used to set the output waveform. Select one from among [SINE](sinusoidal
waveform), [SQUARE](square waveform) and [TRIANGLE](triangular waveform).