Mitsubishi Electric MUX-25TV - E1 User Manual download pdf (Page 42)

S1 to the

SET

LEVEL position. Con-

nect an oscilloscope

probe

to the top

GAIN

control

R19. Plug in the Step

Generator's

line cord and

turn on the

power.

While

observing

the oscillo-

scope

display, adjust

and

R2 for

minimum distortion

of the sine

wave;

adjusts

for symmetry and

R2 ad-

justs

for shape.

You

want

wave-

form

with good rounding and sym-

metry. (If

possible, use a distortion

analyzer to adjust

for

minimum dis-

tortion.

should

be possible

to get

the distortion

down to

0.5%

with

trimmer

potentiometers

R1 and

R2.)

Move the scope's

probe

to one of

the

outputs

of the buffer amplifier.

Turn GAIN control

R19 fully clock-

wise and adjust

until clipping

evident;

then back off until

clipping

just disappears.

This

is the maximum

output point.

It should be about

+ 22

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SYNERGETICS

Box 809 -ME

Thatcher,

AZ 85552

(602)

428

-4073

CIRCLE 48 ON FREE INFORMATION CARD

48 /

MODERN ELECTRONICS

/ April 1986

dBm

with

+ 15-

and

- 15

-volt

pow-

er supply.

Operation of

the

Audio

Step

Gen-

erator is relatively

straightforward.

With SI in

the

SET LEVEL position,

adjust the output level

the Genera-

tor to the level the

device

under test

normally

sees at its input. Then set SI

STEP

and use

to set the

RATE

which

the generator

steps through

the frequencies. With STOP

/RUN

switch S2, you

can

stop the Genera-

tor

at any

frequency

and

then

con-

tinue on.

Whatever

frequency

se-

lected will

positioned between the

highest and lowest frequencies to

serve as a

marker

so that

you

can tell

where

the Generator is oscillating

Resistor ('alculation

To calculate

resistor values for a giv-

frequency more accurately,

you must

obtain a

accurate

value for timing

capacitor

CI. The following computer

program will do this for

you

and then

calculate

the resistor

values

for any

frequencies you

choose. For this pro-

cedure, you

will

need a good ohmmeter

and a frequency

counter (or oscillo-

scope).

The program

was written to run

on an

Apple II.

Your first objective is to accurately

determine the

value of CI as follows:

(1) Connect

the frequency counter or

oscilloscope to the Step Generator's

in-

put. If

you

are using

a scope, set

its

sweep

external

and apply a 60 -Hz sig-

nal to the external input

from

a 6.3 -volt

filament transformer or other conve-

nient signal source.

(2) Temporarily substitute a 250,000-

ohm potentiometer

for R6

the

Step

Generator's

main

board.

Connect ei-

ther outer

lug

of the pot to

one of the re-

sistor

connections and the

wiper lug

the

other resistor connection.

(3) Set

the

Step

Generator to its SET

LEVEL mode and adjust the potentiome-

ter

for

reading

240 Hz on the fre-

quency counter.

If you are using a

scope,

the displayed

Lissajous

pattern

should

resemble two connected

figure

lying on their sides

when

the pot

properly

adjusted.

(4) Making sure not to disturb

the

po-

tentiometer's

setting, disconnect

from the circuit

and measure the

resis-

tance between

its

wiper

and the selected

lug. Make a note of your

reading,

since

it will

used later by the computer

pro-

gram to calculate the

value

of timing ca-

pacitor Cl.

]LIST

130

PRINT "INPUT THE 10 FREOUENC

IES YOU WANT TO

CALCULATE

RESISTOR VALUES

FOR (HZ)"

10 HOME

140 FOR Z =

20 REM

tt STEP

GENERATOR

145 PRINT

REM tt

RESISTOR

CALCULATION

150 INPUT F

INPUT "DO YOU

WANT TO

CALCULA

160 R = 1 / (C t F)

TE THE EXACT

CAPACITANC

170

F(Z)

= F:R(Z) = R

E VALUE OF Cl

(Y OR N) ? " ;A$

180 NEXT

200 INPUT "DO YOU

WANT PRINTER 0

UTPUT (Y OR N) " ;PS

IF AS = "Y" THEN

210

PS = "Y"

THEN PR# 1: GOTO

IF AS = "N"

THEN 70

240

GOTO 40

220 IF P$ = "N"

THEN 240

INPUT "ENTER

THE VALUE

OF Cl

230

GOTO 200

(UF) ";C

240 HOME

75 C =

C 8 lE -

6: PRINT

250

TAB( 5) "FREQUENCY

TAB(

80 GOTO

130

20) "RESISTOR VALUE"

270

INPUT "INPUT

RESISTANCE

MEASU

280 FOR

Z = 1 TO 10

REMENT OF

TEST POT (OHMS)

";R

290 PRINT

300 R(Z)

R(Z)

- 150

310

PRINT TAB( 7 )F(Z):

TAB( 22)

100

C = 1 / (R

t 240)

INT (R(Z)) /

1000 "K OHMS"

120

"EXACT VALUE

OF CAPACI

320

NEXT Z

TOR

Cl IS

"C" OF "

330 PRINT

125

340

PRINT TAB( 10)

"FOR C = "C t

1E6

"UF"

Say

You

Saw It In Modern Electronics

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Mitsubishi Electric MUX-25TV - E1 User Manual Page 42

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