Wavetek 145 Instruction Manual page 14

Step
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2-2
MODEL 145 OSCILLOSCOPE
I
J
ruNc OUT
CH 1
D
t -
-
•
I
SYNC OUT TRIG
1
I
GCV OUT (REAR PANEL) CH 2
EXT DC OFFSET
FUNCTION GENERATOR
(REAR PANEL)
I
I
OR VOLTAGE SOURCE
- OUTPUT
INITIALLY OFF
Figure 2-1. Initial Setup
Table 2-1. Acceptance Procedure
Control Position/Operation Observe
POWER
ON
1 kHz square wave.
Dial Rotate dial. Return to 1.0.
Rotation ccw increases frequency of square on
one channel and de level on other channel; cw
decreases frequency and de level.
FREQ/PERIOD MULT Rotate switch. Return to 1K. Rotation cw increases frequency; ccw decreases
frequency (de level not affected).
VERNIER Rotate ccw. Return to CAL. Rotation ccw gives a small decrease in frequency.
ATTENUATION Rotate ccw. Return to 0. Rotation ccw reduces square wave amplitude.
ATTENUATION VERNIER Rotate ccw. Square wave amplitude decreases.
DC OFFSET Rotate cw. Return to OFF.
Square wave is immediately offset below previous
level; then waveform moves up to a positive level.
OFF returns waveform to original position. (Clip-
ping occurs at ±15V.)
Function Generator or Vary input voltage. Waveform de level varies.
Voltage Source
Remove EXT DC OFFSET IN cable and connect to VCG I~ connector. Remove
GCV
OUT cable.
Function Generator or
Voltage Source
ATTENUATION VERNIER
FUNCTION
GENERATOR MODE
MANUAL TRIG
Vary input voltage; then dis-
connect input.
Rotate cw.
Rotate to DC,
I\.
"v ,
v,
~
, n ,
U ,
then ~
GATE
Press down.
Frequency increases with increased voltage, de-
creases with decreased voltage.
Square wave amplitude increases.
Note de level on scope.
f\; ,
'v
and
1-J
should be centered on de level.
fl
should rest
on de level,
U
should rise to de level.
A de level.
A series of sine waves.