Wavetek 193 Instruction Manual page 20

13 SYNC OUT Connector - The sync signal from
this BNC is a TIL level into 50Q,synchronous with
FUNCOUT15signal.ln
f""LJ
,dutycyclevarieswith
waveform symmetry. Source impedance is 50Q.
14 DC OFFSET Pushbutton - Depressed button
activates dc offset 12. Extended button ensures
zero dc offset.
15
FUNC OUT Connector - This BNC is the
waveform, or dc, output of the main generator
(alone or modulated).Maximum output is 30 Vp-p
(15 Vp-p into 500). Source impedance is 500.
16 AMPLITUDE Control - Continuously varies
waveform amplitude within each. OUTPUT
ATTEN 17 range. Full ccw rotation reduces
waveform amplitudes by greater than 10 dB. DC
and dc offset voltages are not affected by this
control.
17 OUTPUT ATTEN Push buttons - Select the
attenuation range of the FUNC OUT 15 signal.
The AMPLITUDE control 16 allows continuous
waveform (but not de) level variations within
each attenuator range. Each of the three buttons
may be used individually for 40, 20 or 10 dB
steps of attenuation, or pressed in combinations
for up to 70 dB of attenuation. The attenuator at-
tenuates both the waveform and dc offset.
18 SUPPRESSED CARRIER Pushbutton -
When pressed, selects suppressed carrier
operation and if extended, selects AM operation.
Figure 3·3. DC OFFSET Control
EXCESSIVE
NEGATIVE
OFFSET OR
LOADING
EXCESSIVE
POSITIVE
OFFSET OR
LOADING
+7.5V-VV------------
-7.5V------------
AfJJ__
POSITIVE NEGATIVE
DC OFFSET DC OFFSET
+ 7 .5V -' V v---- --------
-7.5V----------n!lL
+7.5V---lS!J- -
ov---
.t:
-7.5V----
_'J__
o
DC
OFFSET
3-2
10 MAN TRIG Pushbutton - Triggers or gates
the output signals when main generator mode is
TRIG or GATE9. In trigger mode, one waveform
cycle is output when the button is pushed. In
gated mode, waveform cycles are continuously
output as long as the button is held in.
11 TRIG IN Connector - This BNC receives the
external trigger and gate signals. These signals
are applied to the trigger and gate circuit when
the MODE switch 9 is in the TRIG or GATE posi-
tions. Refer to Section 1, Trigger (and Gate).The
TRIG LEVEL control 9 varies the firing point of
the TRIG IN signal.
12 FUNCTION Selector - Outer coaxial knob
selects one of the three main generator
waveforms (sine, triangle, square), dc, and AM.
DC OFFSET Control - Inner coaxial control
offsets the main generator output waveform ver-
tically from its normal position and, when
FUNCTION(outer coaxial switch) 12 is in the DC
position, controls polarity and voltage of dc out-
put. DCoutput range is 0 ± 10 Vdc ( ± 5 Vdc into
500). DC OFFSETswitch 14 must be depressed
to enable this DC OFFSETcontrol. Extendingthe
DC OFFSETswitch ensures zero volt offset. DC
offset and waveform are attenuated by the OUT-
PUT ATIEN control 17, but dc offset is not at-
tenuated by the AMPLITUDE control 16.
Waveform peak voltage plus dc offset is limited
to ± 15 Vdc (± 7.5 Vdc into 500). See figure 3-3.
Figure 3·2. Minimum Trigger Signal
Trigger signal must be a
positive going signal
exceeding the TRIGGER
LEVEL setting.
TRIGGER
- -.1\--
LEVEL
_\N-=-
1 Vp-p MIN.
SIGNAL
- .1\--
-5V
TRIGGER LEVEL
CCW ----------------~ CW
t
CONTROL
+ 5V -
-.1\:-