EZ Digital OS-3060D Spezifikationen PDF herunterladen (Seite 76)

Pha

se difference measurement shall comply with the following proced

ure:

I. Rotate the TIME

IV switch fully clockwise and set it to the X-Y

position.

CAUTIO

At this time, the trace on the CRT screen is so bright

that it could often d

age the CRT phosphor. So reduce the

trace intensity properly.

2. Make sure that CH2 POS ITION [I

X] and PULL X5 MAG knob r1

arc

pushed in.

3. Connect

one signal to the CHI, X IN connector

and another

signal to

the C1I2. Y IN connector [l O],

4. Center the waveform by adjusting the

CH2

vertical POSITION c

ontr

[18). and adjust the CH2 VOLTS/DIV switch [14J and VARIABLE control

[16) together so as to make the waveform be

com

e 6 divisions (the

waveform exists on the 100% and 0% graticule line).

5. Adjust the CH I VOLTS/DIV switch

113].

and

VARIABLE to make the

waveform bec

ome

6 divisi

s as d

e in Item 4 above.

ecisely center the wavef

orm

to have it exactly positi

oned

right on

the horizontal center by

adju

sting the horizontal

POSmON

control

1261

Count

the

number

of divisions indicated by the wavef

orm

along

the

central vertical graticule line. You may count moving the wavef

orm

by me

ans

the CH2 position control for close me

asur

ement.

8. The phase difference

the two signals (angle e) is equal to the

arc sine of A B (the

numb

er divided by 6 in Item 7 above). For

example, when the waveform is

sam

e as the described in Figure 2-20a,

if you perform the calculation according to Item 7 above, the

resultant is the arc sine value of 2

+6=

0.3334.

which is converted into 19.5° in terms o

f'the

gle.

PHASE DIFFERENCE (angle

=si

The

simple method

can

directly be applied to angles less than 90°.

As for angles greater than 90°, add 90° thereto. So

tha

t you are

required to determine its value with referring to various phase

angle indicated in Fig. 2

-1I(b)

NOT

E : The conversion of sine angle

can

be obtained in acc

ordance

with trig

ometric function table

and

trigonometric function

expression.

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 113 114

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