Wavetek 143 Instruction Manual page 11

®
as a trigger or gate in the trigger and gate modes.
The trigger level can be varied from fully cw, where
a positive-going excursion thru approximately -1
CN
is a trigger, to fully ccw, where a positive-going ex-
cursion thru approximately +10V level is a trigger.
MANUAL TRIGGER Switch
Triggers or gates the ou)l?.:'t signal when GENER-
ATOR MODE switch
~
is at TRIG or GATE.
In trigger mode, one cycle is output when the
switch is pressed. In gate mode, cycles are contin-
uously output as long as the switch is held down.
NOTE
Set TRIGGER LEVEL
@
fully ccw.
TRIGGER START/STOP Control
Sets the start and stop point of the sine or triangle
waveform appearing at
("j) .
Usually used in the
trigger mode and in combination with
@
to
create desired waveforms. 0° CAL position ensures
conventional waveforms symmetrical about 0 Vdc.
@
ATTENUATION Control
®
®
3-2
Outer knob reduces output voltage level of all
output at FUNCTION OUT with increasing steps
of attenuation.
VERNIER Control
Inner knob is a 20 dB vernier which controls the
output within the steps of the outer knob. DC and
offset voltages are not affected by this control.
FUNCTION OUT Connector
The main output of the generator. The output of
the function selected.
SYNC OUT Connector
Furnishes a TTL pulse for each cycle or period of
the generator. To be used for scope or similar syn-
chronization.
FUNCTION Switch
Selects one of six output signals: de, waveforms
or pulses.
@
DC OFFSET Control
Offsets the waveform or de level at
("j)
from
-15V to +15V (open circuit; ±7.5V into 50.12).
An OFF position ensures no offset.
SYMMETRY Control
Normal symmetrical output results when SYM-
METRY is set to OFF; an asymmetrical, or un-
balanced, waveform results when SYMMETRY
is set between
JlJ
and
JlI .
(Asymmetrical
operation reduces generator frequency to approx-
imately 1/10th the normal output.) Figure 3·2
shows the effect of SYMMETRY control on the
waveforms.
NOTE
When SYMMETRY control
is
used, the output
frequency is different from the dial indicated
frequency. The maximum symmetry ratio ob-
tainable also depends on the frequency dial
set-
ting.
ASYMMETRY
JlJ
IROTATE CCW)
SYMMETRY
(NORM)
-d-1..:.P
ASYMMETRYJlf
(ROTATE CW)
Figure 3-2. Effect of SYMMETRY Control
@
TRIG IN Connector
Accepts a 1V p-p to ±10V external signal to trigger
the generator. (Up to ±50V will not damage cir-
cuitry.) Triggers on rising edge of input which
crosses TRIGGER LEVEL
@
setting from nega-
tive to positive.
@
VCG IN Connector
Accepts 0 to +2V ac or de voltages to vary up to
1000: 1 the frequency and period of the outputs.