Wavetek 164 Instruction Manual page 16

20.
2]
221
23.
24.
25;
26.
2-6
TRIG LEVEL near 12 o'clock. The oscilloscope
should display one cycle of the waveform each time
the sweep output triggers the main generator.
Set the GEN MODE switch to GATED and rotate
the TRIG LEVEL control while observing the oscillo-
scope. The multiple cycles of the selected output
waveform should appear when the TRIG LEVEL
control is rotated cw and reduce to one cycle, then
none, when the control is turned ccw. At some point
ccw the generator stops oscillating, and at some point
cw it goes into continuous operation.
Turn SWEEP/STEP TIME switch to OFF. Use MAN
TRIG switch to gate waveforms. Waveforms should
be continuous when MAN TRIG switch is held down.
Set the GEN MODE switch to TRIG. Use MAN TRIG
switch to trigger waveforms. One cycle should appear
each time the trigger is pressed.
Turn SWEEP/STEP TIME switch to 10 ms I1 ms and
GEN MODE switch to GATED. Set TRIG START/
STOP switch to VAR and rotate VARIABLE knob
full cw. Observe the start/stop point of the waveform.
Rotate the VARIABLE knob and trigger waveforms
to observe the varying start/stop points. At full cw
the waveform should start/stop at approximately +90"
(positive peak); at full ccw, approximately —90° (nega-
tive peak); and at midpoint, 0°. (TRIG LEVEL may
require adjusting.) Set TRIG START/STOP switch to
0° CAL. Disconnect the cable to TRIG IN.
NOTE
Steps 24 and 25 set low and high frequencies
of the sweep range.
Set the GEN MODE switch to SWP HOLD, TRIG
LEVEL control to 9 o'clock, FREQ (Hz) range to
X 10K, SWEEP/STEP TIME switch to 10 s 1 1 s and
SWEEP MODE switch to RAMP UP. With a counter,
the frequency dial and FREQ (Hz) VERNIER control,
set the frequency to 30 Hz.
Rotate the TRIG LEVEL control to 3 o'clock (trig-
gering the generator) and rotate the SWEEP WIDTH
control to set the frequency to 30 kHz.
Rotate the TRIG LEVEL control to 9 o'clock, and
the GEN MODE switch to CONT SWP. Output should
be the 30 to 30 kHz swept signal continuously re-
peating.
27. Set GEN MODE switch to TRIG SWP and press the
MAN TRIG switch. The generator output should be
the swept signal occurring once for each trigger.
28. Set the GEN MODE switch to SINGLE STEP and
SWEEP MODE switch to STEP UP. Press the MAN
TRIG ten times while observinc the stepped increase
in output frequency. The eleventh trigger should
return the frequency to 30 Hz.
29. Remove the cable from 50€) OUT and connect to
GCV OUT. Connect SYNC OUT to the oscilloscope
trigger input. Trigger the generator as in the previous
step. Observe the varying voltage corresponding to
the varying frequency output. Reconnect the cable
to 502 OUT (HI).
30. Set the GEN MODE switch to SWP BURST and press
the MAN TRIG switch and hold. A frequency step-
ping and hold should occur. When the switch is
released, no signal should be present.
2.5 OPERATING PROCEDURE
No preparation for operation is required beyond comple-
tion of the initial installation checks given in Paragraph 2.4
of this manual. It is recommended that a one-half hour
warm-up period be allowed for the associated equipment
to reach a stabilized operating temperature, and for the
Model 164 to attain stated accuracies.
There are almost unlimited ways to set up the generator
and waveforms that may be obtained. The following sections
describe basic configurations and how to set them up.
2.5.1 Operation as a Function Generator
il. Depress the POWER switch. Properly terminate the
5022 OUT (HI) connector.
2: Set the GEN MODE switch to CONT.
9 Set the FREO (Hz) range switch to the desired
multiplier.
4. Set the frequency dial to the desired setting. Use the
frequency VERNIER for precision frequency setting
if necessary.
5! Select desired basic output waveform using the WAVE-
FORM selector.
6. Set OUTPUT ATTEN (dB) switch for desired output