Wavetek 143 - Page 10

MODEL 143
SYNC OUT TRIG
GCV OUT (REAR PANEL)
OSCILLOSCOPE
CH 1
сн?
FUNCTION GENERATOR
OR VOLTAGE SOURCE
INITIALLY OFF
OUTPUT
Figure 2-1. Initial Setup
Table 2-1. Acceptance Procedure
Step Control Position/Operation Observe
1 POWER ON 1 kHz square wave.
2 Dial Rotate dial. Return to 1.0. Rotation ccw increases frequency of square on
one channel and dc level on other channel; cw
decreases frequency and dc level.
3 FREOUENCY MULT Rotate switch. Return to 1K. Rotation cw increases frequency; ccw decreases
frequency (dc level not affected).
4 VERNIER Rotate ccw. Return to CAL. Rotation ccw gives a small decrease in frequency.
5 ATTENUATION Rotate ccw. Return to 0. Rotation ccw reduces square wave amplitude.
6 ATTENUATION VERNIER Rotate ccw. Square wave amplitude decreases.
7 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.)
8 Function Generator or Vary input voltage. Waveform dc level varies.
Voltage Source
Remove EXT DC OFFSET IN cable and connect to VCG IN connector. Remove GCV OUT cable.
9 Function Generator or Vary input voltage; then dis- Frequency increases with increased voltage, de-
Voltage Source connect input. creases with decreased voltage.
10 ATTENUATION VERNIER Rotate cw. ---
11 FUNCTION Rotate to DC, ^V , ^v, Note dc level on scope. W., ^y and "ly
fS then А7 should be centered on dc level. j | should rest
on dc level, 1 [ should rise to dc level.
12 SYMMETRY Rotate cw, then to OFF. Waveform changes from ^v to M to NN
2-2
and frequency decreases, then to ^y at
original frequency.