Kenwood CS-2110 Instruction Manual page 29

Using the formula:
T i m e difference = (2nd dial reading - 1 s t dial reading)
x Delayed s w e e p time (A S W E E P T I M E /
DIV setting)
Fig. 32
[ E X A M P L E ]
For the example in Fig. 3 2 , the reference signal dial reading
is 1.00 while the second dial reading is 5 . 3 4 with the A
S W E E P T I M E / D I V setting of 2 /zs.
Substituting the value.
T i m e difference = ( 5 . 3 4 - 1.00) x 2 (//s) = 8.68 fis
X - Y O P E R A T I O N
P H A S E M E A S U R E M E N T
Phase measurements may be made with X - Y operation.
Typical applications are in circuits designed to produce a
specific phase shift, and measurement of phase shift dis-
tortion in audio amplifiers or other audio network.
Distortion of amplitude is also displayed in the oscillo-
scope waveform
T o make phase measurements, use the following proce-
dure
1. Using an audio signal generator with a pure sinusoidal
signal, apply a sine w a v e test signal at the desired test
frequency to the audio network being tested.
2. S e t the signal generator output for the normal operat-
ing level of the circuit being tested. If desired, the cir-
cuit's output may be observed on the oscilloscope. If
the test circuit is overdriven, the sine w a v e display on
the oscilloscope is clipped and the signal level must be
reduced.
A P P L I C A T I O N
Read the dial setting w h e n
B s w e e p points of D E L A Y
T I M E M U L T © a n d
(Dare in the s a m e position
Fig. 33
No amplitude distor- A m p l i t u d e distortion,
tion, no out of phase. no out of phase.
Amplitude distortion,
No amplitude distor-
out of phase.
tion, out of phase.
Fig. 34
3. Connect the channel 1 probe to the output of the test
circuit.
4. Select the HORIZ D I S P L A Y s w i t c h to X - Y .
5. Connect the probe between the channel 2 INPUT jack
and the input of the test circuit.
6. Adjust the channel 1 and 2 gain controls for a suitable
viewing size.
7. S o m e typical results are s h o w n in Fig. 3 4 . If the t w o
signals are in phase, the Lissajous' pattern is a straight
diagonal line. If the vertical and horizontal gain are
properly adjusted, this line is at a 45° angle.
A 90° phase shift produces a circuilar Lissajours' pat-
tern.
Phase shift of less (or more) than 90° produces an ellip-
tical Lissajous' pattern. T h e amount of phase shift can
be calculated from the oscilloscope trace a s s h o w n in
Fig. 3 3 .
F R E Q U E N C Y M E A S U R E M E N T
Frequency measurement may be mode with the L i s s a -
jous' pattern, as phase measurement.
Procedure:
1. Connect the sine w a v e of known frequency to the
channel 2 INPUT jack of the oscilloscope and select the
HORIZ D I S P L A Y s w i t c h to X - Y .
2. Connect the vertical input probe (channel 1 input) to the
unknown frequency.
S I N E 0
= -
A
v
W H E R E 0 = P H A S E A N G L E
180° out of phase.
90° out of phase.
2 9