Wavetek 193 Instruction Manual page 19

3-1
9
8
negative voltages decrease the frequency. The
VCG IN will not drive the generator frequency
beyond the normal limits of a range. (Upper limit:
2
x
FREO MULT setting. Lower limit: 111000
upper limit). Input impedance is 5 kO.
SYM Pushbutton - This switch, when
depressed, allows main generator waveform
symmetry to be varied 19:1 to 1:19 range by the
VERNIER/SYM controlS (as a result, the main
generator frequency is divided by 10). When
extended, the switch allows the main generator
to produce normal (50% duty cycle) waveforms.
GCV OUT Connector - This BNC provides dc
excursions of 0 to
+
5V (open circuit) that
represents the main generator output frequency
in the range selected by FREO MULT
5.
Source
impedance is 6000.
MODE Control - This outer coax control
selects one of the three main generator
operating modes:
CONT - Continuous output at FUNC OUT 15
and SYNC OUT 13 connectors.
TRIG - A dc level output until the generator is
triggered by the MAN TRIG 10 or with a signal at
the TRIG IN connector 11. When triggered, the
generator output is one cycle of waveform
followed by a dc level.
GATE - As for TRIG except the output is con-
tinuous for the duration of the manual or external
trigger signal. The last waveform cycle started is
always completed.
TRIG LEVEL Control - This inner coax control
is a continuously variable adjustment of the trig-
ger circuitry firing point. When full ccw, a
positive going signal at approximately
+
5V is re-
quired for triggering (see figure 3-2). In the full
cw position, a positive going signal at approxi-
mately - 5V
or
more positive voltage is required
for triggering. In the gated modes, the generator
will run continuously when the control is cw of
12 o'clock.
7
SEcnON3
OPERATION
3.1 CONTROLS AND CONNECTORS
The generator front panel controls and connectors
are shown in figure 3-1 and keyed to the following
descriptions.
1 FREQ/START FREQ Dial - Settings under the
dial index mark summed with 6 and multiplied by
5
determine the main generator signal frequency
at FUNC OUT 15.
2
POWER Pushbutton - Depressed is power
on, extended is power off.
3 AUX OUT Connector - This BNC is the aux-
iliary generator waveform output. The FUNC
control 21 of the AUX GEN selects the waveform
and the WIDTH/aF/aM control
20
varies the
waveform level from 0 to 10 Vp-p (5 Vp-p into
6000). Source impedance is 6000.
4
AM IN Connector - This BNC receives the
external amplitude modulation or suppressed
carrier signal. When FUNC switch 12 selects
AM, a 5 Vp-p signal gives 100% modulation for
normal AM (SUPPRESSED CARRIER18 extended)
or a 10 Vp-p signal gives suppressed carrier
operation (SUPPRESSED CARRIER18 pressed).
Source impedance is 6000.
5
FREQ MULT Control - Outer coax control
selects one of nine frequency multipliers for dial
1
setting.
VERNIER/SYM Control - When SYM 7 is off
(extended) this inner coax control is a fine
adjustment of the dial 1 setting. When SYM 7
switch is on (depressed) this control varies the
symmetry of the main generator waveforms
(normally 50% duty cycle). Symmetry range is
19:1 to 1:19 (half cycle to half cycle ratio). When
SYM is used, the main generator frequency is
divided by 10. Extending SYM switch ensures
1:1 (50%) symmetry.
6 VCG IN Connector - This BNC accepts ac or
dc voltages to proportionately control main
generator frequency within the range deter-
mined by the FREO MULT
5.
Positive voltages
increase the frequency set by the dial 1;