Huntron HTR 1005B-1 User manual

MAINTENANCE MANUAL
HUNTRON TRACKER
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Huntron Instruments, Inc. 15123 Pac f c H ghway North Lynnwood, WA 98036 [phone]
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TABLE OF CONTENTS
WARRANTY
3
I
SPECIFICATIONS
5
GENERAL DESCRIPTION
6
!
THEORY OF OPERATION
CIRCUIT DESCRIPTION
INTERNAL SET-UP AND ADJUSTMENTS 16
CHARTS AND DIAGRAMS
© COPYRIGHT 1980 — HUNTRON INSTRUMENTS INC.
I
Schematc D agram .......................
Waveforms ......................................
P.C. Board Voltages .......................
Component Parts L st ...................
Assembl es L st .............................
Schematc Rev s ons .....................
Exploded V ew of Case .................
P.C. Board Voltages .......................
Photograph of Instrument Inter or
Tr mpot Locat on Chart .................
Exter or and Interor Drawngs . . .
S gnal Secton ...................
Inverter Power Supply . . . .
Cathode Ray Tube C rcu ts
Power Supply .....................
General Informaton .................
The Test S gnal .........................
Test ng React ve Components
6
7
10
12
14
15
15
20
25
25
28
30
33
34
35
36
37
38
18
19
19
23
24
TROUBLESHOOTING
General Informat on ........
Power Supply ...................
S gnal Secton .................
Cathode Ray Tube Secton
Inverter ............................. .

3
LIMITED WARRANTY
For a perod of one year from the date of ts purchase new and undamaged from Huntron
Sales, Inc., HUNTRON INSTRUMENTS, INC. wll, wthout charge, repa r or replace, at ts
opton, ths product f found by t to be defectve n materals or workmanshp, and f returned
to HUNTRON INSTRUMENTS, INC. at ts factory, transportaton prepa d. Th s lmted
warranty s expressly cond t oned upon the product hav ng been used only n normal usage
and servce n accordance w th nstructons of HUNTRON INSTRUMENTS, INC. and not
hav ng been altered n any way or subject to msuse, neglgence or damage, and not hav ng
been repared or attempted to be repa red by anyone other than HUNTRON INSTRUMENTS,
INC. or ts author zed agent. EXCEPT FOR THE FOREGOING EXPRESS WARRANTY OF
REPAIR OR REPLACEMENT HUNTRON INSTRUMENTS, INC. MAKES NO WARRANTY OF
ANY KIND, INCLUDING BUT NOT LIMITED TO. ANY EXPRESS OR IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, AND HUNTRON
INSTRUMENTS, INC. SHALL NOT BE LIABLE FOR ANY DAMAGES, WHETHER DIRECT OR
INDIRECT, CONSEQUENTIAL OR INCIDENTAL. FORESEEABLE OR NOT. OR OTHERWISE,
BEYOND REPAIR OR REPLACING THIS PRODUCT.
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HTR 1005B-1
SPECIFICATIONS
A.C. Power Input
Physical Dimensions
5 pounds
Weight
Signal Information
Range
5
Low Range (Open test po nts) ....
Low Range (Shorted test po nts)
H gh
Med
Low
.8% nch
,.3 1 /2 nch
11 1 Z? nch
17 Watts
20 Watts
W dth..
Heght.
Length
Current
R.M.S.
M.A.
.25
.25
92
Current
Peak
M.A.
.7
.7
250
Voltage
P-P open
circuit
120
40
18
Power
R.M.S.
M.W.
.18
.18
65
Power
Peak
M.W.
.5
.5
250
All ratngs, except P-P voltages, are cond t ons ex st ng
across a s ngle s l con d ode n the test term nals of the
Tracker.

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GENERAL DESCRIPTION
e
The RANGE SWITCH determ nes the voltage and mpedance level of the test s gnal source.
THEORY OF OPERATION
6
The current flow s processed n such a way as to cause a vertcal deflect on of the scope
trace, wh le the voltage drop across the test component causes a hor zontal deflecton of the
scope trace.
The HUNTRON TRACKER appl es a test s gnal across two term nals of the dev ce be ng
tested. Th s test s gnal causes a current to flow through the dev ce and a voltage drop across
ts termnals.
Included as standard equ pment w th each TRACKER s a set of spec al purpose probes. The
probe leads plug nto the front panel test jacks, are f ve feet long and because of spec al t ps
can be used to contact very small component termnals, as well as small P.C. etchngs
w thout the danger of shortng adjacent termnals and leads.
The TRACKER s used to test components n the “ power off ’ ’ cond t on and can be used to
test components mounted on pr nted c rcu t boards or other “ n-c rcu t ” cond t ons, and w th
components br dged by var ous types of res st ve values.
The HUNTRON TRACKER s a “ Specal Use Type ” of osc lloscope and s gnal process ng n 
strument that, through v sual d splay, determ nes the qual ty of certan types of electronc
components.
Access to the component be ng tested s through a two termnal system of test leads that are
placed across the component under test. The test leads are nserted nto the TRACKER front
panel.
Dev ces that are normally tested by the TRACKER nclude the followng:
Sem-conductor d odes and b -polar transstors; f eld effect transstors; ntegrated c rcu t
ch ps of the b -polar and M.O.S. type, nclud ng both d g tal and analog; certan types of
capac tors and nductors.
Front panel controls nclude HORIZONTAL and VERTICAL adjustment of the scope trace,
TRACE INTENSITY POWER SWITCH and three RANGE SWITCHES. An INDICATING l ght
determ nes when the power s “ on ” . The SCOPE tube has a 2Vz " x 2" face protected by a l ght 
ly smoked glass plate.

THE TEST SIGNAL
]
7
Th s s gnal s an 80 HZ modfed s ne wave that apples alternately, pos t ve and negatve,
voltages across the component be ng tested. In an open c rcu t cond t on the pos t ve half
cycle generates the left s de trace on the scope tube; the r ght s de trace would be the
negat ve half cycle. The 80 HZ test s gnal s or g nated n a self contaned osc llator and
presented at the front panel test termnals through a s gnal transformer. The transformer has
the dual purpose of adjustng the test voltage level for the var ous ranges, as well as selectng
the mpedance level of the var ous ranges.
The test s gnal as presented at the front panel, electrcally appears as though t s be ng
or g nated by a mod f ed current generator. A true current generator has nf n te nternal m 
pedance and therefore ts current output s not effected by the load across the generator. The
TRACKER test s gnal generator mpedance s f n te and s d fferent for all three ranges.
Figure 2 shows an electr cal equvalent of the generator secton and how the voltage across
the term nals affect the hor zontal and vertcal deflect on plates of the scope. Shown s the
symbolc representaton of a current generator, GEN, w th a ser es nternal mpedance, Zgen,
and a current sens ng po nt, I. Across these network elements are two test po nts, A and B.
Z gen
—
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B
■'♦20
\
\
\
-20 \.
The f gure shows that a test component has not been placed across the test po nts and
therefore only the hor zontal voltage vector would appear at the scope. Zero current would be
flowng, as sensed, po nt I and the resultant equ valent voltage at the vertcal scope plate
would be zero.
FIGURE 2

c
o o o
G-
□ □□□
8
! JUNCTION
RANGE
A non-lnear component such as a sem -conductor juncton would allow a large current to
flow dur ng the half cycle when t s forward b ased and very l ttle current to flow durng the
reverse b as half cycle. Also the voltage drop across the juncton durng forward b ased cond 
t on would be small; .e., .7 volt; th s would appear as a near short durng the forward b ased
mode and would cause a vertcal trace to appear durng that porton of the cycle. The reverse
b ased cond t on would cause very l ttle current to flow w th a large voltage drop and would
look l ke a hor zontal trace on the scope.
S nce a pure res stance s always a “ lnear ” electr cal element, the resultng trace w ll always
be a stra ght l ne. “ Non-lnear ” electr cal elements, those that are not reactve (contan n 
ductance or capac tance), never g ve a straght l ne over the entre trace length. React ve
elements present a spec al case and w ll be covered later.
A pure res stance across the test leads would create both current flow and voltage drop to the
test leads and would therefore show up on the scope as a deflected stra ght trace. The HIGH
and MEDIUM ranges would have the trace deflected clockwse around the center of the scope
tube from the hor zontal, open c rcu t, pos t on whle the LOW range deflecton would be
clockwse from the d agonal pos t on. On all ranges the length of the trace s reduced
because voltage caused by the res stor load and the trace s rotated toward a more vert cal
pos t on because of the ncreased current through the load. The amount of trace reducton
and rotat on depends upon the test res stance value and the range chosen for the test.
The test leads “ shorted ” cause maxmum current to flow n the leads and zero voltage across
the leads and would therefore be nd cated by a vertcal trace from top to bottom of the scope.
Th s s true n all ranges.
An “ open c rcu t ” cond t on would have zero current flowng through the test leads and would
show max mum voltage across the test leads. On the HIGH and MEDIUM ranges ths s
represented by a straght hor zontal trace from the max mum left to the max mum r ght of the
scope face. The LOW range “ open c rcu t ” cond t on s a d agonal trace from the upper r ght
to the lower left corner of the scope.
u
SEMICONDUCTOR
n LOW I
Figure 1 shows a sem -conductor juncton beng observed wh le the TRACKER range sw tch s
n the LOW pos t on.
FIGURE I