MARKER
GENERATOR
RF
osc U
X - Y
DEMODUL
ATOR
. D I R E C T
- 1
AUDIO AMPS
FM RECEIVER
Fig.
2 3
T y p i c a l F M receiver alignment set-up
X - Y O P E R A T I O N A P P L I C A T I O N S
Phase Measurement:
Phase measurements may be made with an os-
cilloscope. Typical applications are in circuits
designed to produce a specific phase shift, and
measurement of phase shift distortion in audio
amplifiers or other audio networks. Distortion due
to non-linear amplification is also displayed in the
oscilloscope waveform
A sine wave input is applied to the audio circuit
being tested. The same sine wave input is applied
to the vertical input of the oscilloscope, and the
output of the tested circuit is applied to the ho-
rizontal input of the oscilloscope. The amount of
phase difference between the two signals can be
calculated from the resulting waveform. To make
phase measurements, using the following procedu-
res (refer to F i g . 2 4 ) .
Fig.
2 4
T y p i c a l phase m e a s u r e m e n t alignment set-up
2 3
SWEEP
GENERATOR
MIXER
l-F AMPS
M A R K E R
INPUT
R F OUT
S W E E P
V O L T A G E
VERTICAL
SIZE
HORIZONTAL
SIZE
AUDIO SIGNAL
GENERATOR
AUDIO
N
§I1%
0
G
RK
TESTED
LOAD
VERTICAL
SIZE
HORIZ JONTAL SIZE
X - Y
