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9. PHASE

DIFFERENCE

MEASUREMENTS

Adjust

90% point to the center

and measure D

Rise

time

Fig.

[EXAMPLE]

For

the example, the measured D-| is 1.6 divisions while D2

1.4 divisions. If

SWEEP

TIME/DIV is 2 /ts/div we use the

following

relationship. (See Fig. 31)

Substituting the given value:

Risetime

= (1.6+1.4) (div)x2 (^ts/div) = 6

jxs

(2) Cursor measurement (CS-5130 only)

In the same way as the ordinary measurement, adjust

the waveform height displayed on the screen to 5 divi-

sions,

and align the

bottom

and top of the waveform

with

and 100% respectively using the •

POSITION

switches.

Set the cursor mode to AT.

Adjust the A

REF

cursor to the crossing of the waveform

and the 10% division of the

scale,

and the A cursor to

the crossing of the waveform and the 90% division.

Measured value is displayed in the upper

right

part on

the screen.

Ordinary, measurement

Phase

difference between two sine waves of the same fre-

quency, etc. can be measured as follows:

Procedure:

Apply the two signals to the CH

and CH2

INPUT

jacks,

setting the vertical MODE to either

CHOP

or ALT mode.

Set the controls to

obtain

normal sweep. Set the

SOURCE

switch to select the signal which is leading in phase

(reference

signal), and adjust the

VOLTS/DIV

and verti-

cal

VARIABLE

controls such

that

the two signals are

equal in amplitude.

Use the

SWEEP

TIME/DIV and

SWEEP

VARIABLE

to ad-

just the display such

that

one cycle of the signals oc-

cupies

8 divisions of horizontal display.

Operate •

POSITION

to shift the two signals on the

center of the

scale.

Having set up the display as above, one division now

represents

45° in phase.

Measure the horizontal distance between corresponding

points on the two waveforms.

Using the formula:

Phase

difference = Horizontal distance (div) x 45°/div

cursor

[EXAMPLE]

For

the example, the horizontal distance is 1.7 divisions.

(See

Fig. 33)

Substituting the given value:

The

phase difference = 1.7 (div)x45°/div = 73.5°

The

above setup allows 45° per division but if more ac-

curacy

is required the

SWEEP

TIME/DIV may be changed

and magnified

without

touching the

VARIABLE

control

and

if necessary the

trigger

level can be readjusted.

In this

case,

the phase difference can be obtained

from

the

SWEEP

TIME/DIV

setting for 8 divisions/cycle and the new

SWEEP

TIME/DIV setting changed for higher accuracy, by

useing the

following

formula.

Adjust

10% point

to the center and

measure

D,.

cycle

Reference

signal

Comparison

signal

Phase

difference

Fig.

Measured value

REF

cursor

Fig.

Brand	Kenwood
Model	CS-5130
Category	Test Equipment
Language	English

Kenwood CS-5130 User Manual

Table of Contents

Questions and Answers:

Kenwood CS-5130 Specifications

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