Wavetek 193 Instruction Manual page 21

3-3
3.2 OPERATION
Perform the initial checkout in Section 2 for the feel of
the instrument. Any questions concerning individual
AM - Allows the auxiliary generator to AM or
suppress carrier modulate the main generator
for AM or suppressed carrier signal at FUNC
OUT 15.
AUX OUT ONLY - Disconnects the auxiliary
generator from the main generator. Allows the
auxiliary generator to be used as an independent
function generator whose output is AUX OUT 3.
WIDTH/aF/aM - Inner coax control serves
several functions dependent upon the outer
coax MODE switch setting. With MODE in aF
position, WIDTH/aF/aM sets the maximum
positive frequency deviation. With MODE SET
WIDTH, WIDTH/aF/aM sets the final sweep fre-
quency. With MODE in SET aM, WIDTH/aF/aM
sets the valley of the FUNC OUT 15 modulation
signal. Finally, with MODE in AUX OUT ONLY,
WIDTH/aF/aM controls the signal amplitude at
AUX OUT 3.
21 FUNC Control - This outer coax control
selects one of five auxiliary generator
waveforms: sine, triangle, square, sawtooth and
pulse. Symmetry of the sawtooth and pulse is
adjustable between 1:19 and 19:1 by the inner
coax SYMMETRY cont rol. When sawtooth and
pulse are selected, the auxiliary generator fre-
quency is divided by 10.
SYMMETRY - When outer coax FUNC control
is set to sawtooth or pulse, this inner coax con-
trol varies the symmetry of sawtooth and pulse
over a 1:19 to 19:1 range.
22 FREQ Control - Outer coax control selects
one of four auxiliary generator frequency
ranges; e.g., 3-100 Hz.
VERNIER - Inner coax control provides con-
tinuous frequency control of the auxiliary
generator frequency range selected by outer
coax FREQcontrol.
23 AUX VCG Connector - This BNC allows up to
a 33:1 auxiliary generator frequency change
with a ± 5V signal. Upper frequency is limited to
the maximum of the selected range. Input
impedance is 11 kQ.
24 AUX SYNC OUT Connector - This BNCprovides
a TTL level pulse which leads the AUXOUT 3 sine
wave by 90°, lags the triangle wave by 90° and is
180° out of phasewith the squarewave.AUXSYNC
OUTduty cycle varies with SYMMETRYcontrol21.
19 AM CARRIER LEVEUNULL Control - In the
AM function (FUNC 12) with the MODE switch
20 set to SET CARRIER, this control sets the
peak-to-peak level of the carrier (main generator
sine wave) at FUNC OUT 15.
If SUPPRESSED CARRIER 18 is pressed, the AM
CARRIER LEVEL/NULL control balances the
peaks of the suppressed carrier signal at FU NC
OUT 15.
20 MODE Switch - Outer coax control selects
one of three basic operating modes of the
auxiliary generator: frequency modulation, fre-
quency sweep, or amplitude modulation. Addi-
tional settings allow static setup of these modes.
The following sections describe each switch set-
ting.
SET FREQ/AUX GEN OFF - Auxiliary
generator is turned off for main generator only
operation, or to allow center frequency (f
0)
adjustment for FM operation. The dial 1 and
FREQ MULT 5 sets the center frequency (fa)for
frequency modulation.
SET aF - In preparation for FM operation,
FUNC OUT 15 frequency is held at the maximum
frequency deviation (fo
+
af). The WIDTH/aFI
aM control 20 sets the maximum frequency.
(Refer to previous paragraph for faselection.)
FM - Allows the auxiliary generator to fre-
quency modulate the main generator creating
an FM signal at FUNC OUT 15..
SET START - In preparation for sweep opera-
tion, FUNC OUT 15 is held at initial sweep fre-
quency. Dial 1 and FREQMULT 5 sets the initial
frequency. FUNC 21 sets the waveform that
controls the main generator frequency.
SET WIDTH - In preparation for sweep opera-
tion, FUNC OUT 15 frequency is held at the final
sweep frequency. The WIDTH/aF/aM control 20
sets the final sweep frequency.
SWEEP - Allows the auxiliary generator to
sweep the main generator creating a frequency
swept signal at FUNC OUT 15.
SET CARRIER - In preparation for AM opera-
tion, allows setting of unmodulated output carrier
level (main generator output) at FUNC OUT 15
by the AM CARRIER LEVELINULL control 19 and
AMPLITUDE control 16.
SET aM - In preparation for AM operation,
holds FUNC OUT 15 at the valley of the modula-
tion signal from the auxiliary generator to allow
level adjustment by the WIDTH/aF/aM control
20.