T EVIS i - AmericanRadioHistory.Com

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simple
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Here's how to
SAVE MONEY ON
INSTRUMENTS!
. . . how to do faster, better test -
V' ing with fewer instruments
, . how to increase the usefulness
` of your present instruments
. how fo choose the right instrument
for each job
). . how to understand
instrument operating
principles
how to evaluate
instrument readings
and puf them to
practical use
BASIC
ELECTRONIC TEST
INSTRUMENTS
By RUFUS P. TURNER
234 pears, 171 illus., Price $4.00
The Instrument
Book Written Especially for
SERVICEMEN AMATEURS
EXPERIMENTERS
Money on instruments and help yon ise your
instruments lots more adlieient Ìy!
Over B11 instruments-from the most modern TV
pattern generators to sperinl- purpose bridges -are
carefully descrihi -il. Their m e fully explained
ad valuable work-saving short cuts outlined.
Included complete details 1 meters
for current and a voltage: uhmmet ors and V -O-Mx
V -T t vvoltmeters: power meters: inipedance meters;
capacitor checkers: inductance checkers: special-purpose
bridges: oscillosc,alone
e. q,es (th
worth
is material is
he entire price of the book to busy s -
1 r -f test oscillators and signal generators:
min! is test ri uat,rs: radio frequency and audio
f equency si s ing devices: n studio-amplifier testing
devices: r -f signal tracers and tube testers.
Among other things, BASIC ELECTRIC TEST IN-
STRI.MENTS complete training a in the
latest instruments including grid -dip oscillators, lLaors, TV
rep :mod marker generators: TV linearity pattern
gem generators, square -wave generators, distortion meters
and others.
SEE WHAT IT CAN DO!
You are slum new s for VOM's 'copes, signa
gem generators and other old standbys. 'tu learn ho
it is to extend the range of m old rinstru-
ments:
1 power drain m entes sr n he used
fast TV trmlmeshooting :aahow a useful c and -
rate bridge can he built from combination nmbination of
familiar general -purpose instruments: to calculate
shama and multipliers: how ton r -f impedance
with a simple T- network: halms- toem
inductance and capacitance with a grid -dip oscillator
and scores of other money -saving "tricks."
Just' off the press! Read PASI( ELECTItONI( TEST
INSTRCM ENTS for 10 duty. art our risk!
Dept. 5(1.43. Rinem art Books, Inc.
Technical Division,'
232 Madman Ave., New York 18, N. Y.
Send Taurner'x (BASIC F'.I.Et'TRONIt' I l ,T IN-
ST111IS11ENTS for lu day FREE: EXAMINATION. If I
deride to keep 'nx.k. I will then remit 51.110 phis
postage' Othu'rwlxe 1 will return book postpaid
0ro01011y and awe yo 1 nothing.
Naine
Address
City. Zone. State
Mac's Service Shop
(Continued from page 6.s
nears the bottom, you know the lower
part of the picture is stretched. The
vertical linearity and the vertical size
controls are juggled together until the
bar remains the same apparent width
during its journey across the face of
the tube; then the vertical linearity
will be correct."
"Yeah, but how about horizontal
linearity. You can't drift the horizontal
blanking bar sideways across the
screen in the same fashion."
"No, but you can achieve the same
result by watching an object on the
screen while the camera pans across
it and observe if its apparent size
changes as it moves from one side of
the screen to the other. Take a weather
map for example. Keep your eye
on one state as the camera swings
back and forth and notice if the width
of that state seems to decrease or increase
as it occupies different positions
from left to right on the screen. If it
does, note where the narrowing or
broadening occurs, for then you will
be sure the picture is respectively
cramped or stretched at that point.
Almost any semi -static picture or
commercial can be observed while
corrective adjustments are made to
remove the nonlinearity.
"Over-all linearity can be checked
by observing any design that carries
a large circle, oval, or other geometrical
figure. The CBS 'eye' is a good
example. Many commercials use some-
thing of this nature. The Lucky
Strike emblem and the elliptical designs
used in a couple of the beer
commercials will quickly tell you if
the linearity is poor, and in what manner
it is off."
"How about such things as focus,
phase shift, ringing, and so on? Can
you judge these matters in a picture ?"
"Just as easily as in a test pattern.
If the tracing dot is really round, you
can focus for the smallest diameter
of raster lines; but if it tends to be
out -of- round, as is often the case, it is
better to adjust for best horizontal
resolution as indicated by one of the
methods we talked about before.
Smearing caused by phase shift, ringing,
and inadequate video amplifier
response can be quickly spotted in any
scene in which a large white area is
suddenly broken by a black area, or
vice versa, such as happens in block
lettering, black state boundary lines
on a white map, etc. Weather maps
are very good for spotting ringing, for
when it is present the vertical lines
will be followed by two or three fainter
lines on the right -hand side. Phase
shift will often produce the effect of
a boxing -ring rope that apparently
can be seen right through the referee.
One thing to watch, though, is whether
or not the trouble is present only
when viewing a network program.
Employer's Name and Address
OUTSIDE Y.S.A. -Price $4.50, pun only. Money Quite often some phase-shift is present
bask if book i. r