Dial - Wavetek 143 Instruction Manual

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2·2
MODEL 143
SYNC OUT
GCV OUT (REAR PANELi
EXT DC
OFFSET
(REAR
PANELi
TRIG
CH 2
Figure 2-1. Initial Setup
FUNCTION GENERATOR
OR VOLTAGE SOURCE
INITIALLY OFF
OUTPUT
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.
FREQUENCY MULT
Rotate switch. Return to 1 K.
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 IN connector. Remove GCV OUT cable.
Function Generator or
Voltage Source
ATTENUATION VERNIER
FUNCTION
SYMMETRY
Vary input voltage; then dis·
connect input.
Rotate cw.
Rotate to DC, '\, ,
'V ,
'1 .
n . u '
then
'V
Rotate cw, then to OFF.
Frequency increases with increased voltage, de·
creases with decreased voltage.
Note de level on scope. '\, ,
'V
and
'1
should be centered on de level.
n
should rest
on de level,
U
should rise to de level.
Waveform changes from
'V
to
IV
to """
and frequency decreases, then to
'V
at
original frequency.