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SECTION 3
Operation
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able duty range has been selected. To modify the variable
duty cycle, turn the (variable duty) knob directly below
the DUTY VAR key. The variable range of duty ratio
is
between 5% and 95% for frequencies up to 10kI-Iz. For
frequencies up to 100 kHz, the variable range
is
behveen
10%
and 90%. It can actually be set until the point where
the waveform i s extinguished, but the waveform may
be-
come unstable. To select the fixed 50% duty cycle mode,
press the
DUTY VAR
FXD,VAR key so that the
LED
in
the center of the key
is no longer lit.
Note that the duty cycle setting also changes the duty cy-
cle of the sync out signal.
To extend the duty cycle range, use the trigger oscillation
mode and one square waveform cycle. Refer to para-
graph 3.5.6 for details on setting the osciUati~n mode.
Synchronous Output
Figure 3-5
illustrates
the phase relationships between the
FCTN OUT
waveform
and
SYNC
OUT
(synchronous
output). Note that as the frequency increases, a substan-
tial
phase differential will result between the waveform
output and the synchronous output signals.
3.5.6
Oscillation Mode
Oscillation
Mode Selection
The oscillation mode setting
is
selected by the
MODE
switch on the right side of the front panel. The present os-
cillation mode is displayed by the lit
LED
next to the se-
lected mode.
Each
time the mode key
is
depressed the
mode is advanced by one. Availableoscillation modes in-
clude
CONT
(continuous), BURST,
TRIG
(trigger), and
GATE.
In addition, it is also possible to select
DC
for a
continuous output of direct current voltage.
CONT (continuous mode)
When the continuous mode is selected, the instrument
generates
the
selected waveform continuously. Trigger-
ing
is not required, and the selected burst cycle and i n t e r -
nal rate parameters have no effect on the output
waveform.
4
Triangular wave
Waveform
- -
-
--
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Rising sawtooth wave
Falling sawtooth wave
Duty variable square wave
~ a v m r n
Id
waveform
--
---
~avefom
R
wave
1
-7---
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1
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1
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1
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SYNC
W l
i
1 - 1
SYNC
OUT
' -
i
OUT
' n
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I
Figure 3-5.
Phase Relationship between FC7'N OUT WaueJom and SYNC OUT
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