Tektronix 576 User manual

CONTENTS
Section
1

S p ecification
Section 2

Operating Instructions
Sectio
n 3

Circuit Descri p tion
Section 4

M aintenance
Section 5

P erformance C h ec k /Cal ibratio
ηP roce d ure
Abbreviations and Symbols
P arts Or d ering Information
Section 6

E lectrical
P
arts L ist
M ec h anical Parts L ist
Information
Section 7

Mechanical P arts L ist
Section 8

Diagrams
M ec h anical
P
arts L ist
Illustrations
Accessories
Abbreviations an d symbols use d in t h is manual
are
base d on or ta k en d irectly from IEEE Stan d ar d
260 "Stan d ar d Symbols for Units", MIL-STD-12B
an d ot her stan d ar d s of t h e electronics in d
ustry .
Change infor m ation, if any, is locate d at t h e rear of
t h is manual .

Type
576
Fig .
1-1
. Type
576 Curve
Tracer .

The Ty pe 576 Curve Tracer is α dynamic semicond ucto
r
tester w h ic h allows d is p lay a n d
meas u rement of c h aracte r is-
tic curves of α variety of two an d
t h ree terminal d evices
i n clu d ing bi p olar transisto r s, fiel d
effect t r ansistors, M OS-
FE
Ts,
silicon controlle d rectifiers and uni j
unction transis-
tors . Α va r iety of possible measurements is
available using
eit h er groun d ed emitter or g r ounde d base conf ί g ιι rations .
T he
instrument has available eit h er an AC or α DC collecto
r
su pp
ly voltage rangi n g from 0 to ±1500 volts . T
h e ste p
generator prod uces eit h er cur r ent or voltage ste p s, w
h ic h
may
be app
lie d to eit h er t h e base terminal or t he
emitter
terminal of t he device un d er test . Ste
p generator out p uts
range f r om 5 ηΑ to 2 Α in t he cur r ent mo d
e,
an d
from 5
mV to 40 V in t he voltage mo de
.
T
h e ste p
s
may also be
pro duced as s h ort d uration pulses .
Calibrate d ste p offset
allows offsetting t h e ste p generato
r outp ut eit h er positive
or negative . T he vertical dis p lay
am p lifier measures eit h er
collector current
or leakage current with α maximum
d eflection
factor of 1 ηΑ / d ivision w h en making α leakage
TA BLE 1-1
ELE CT R ICA L C H A R ACT ER ISTICS
Collector Sup p
ly
I
Collector S upp ly Maxi mu m Con ti nuou s P ea k C urr
en t O p e r ating
Ti m e vs
D u ty Cycle a nd Ambient Tem p erature .
W
it
h t he PEAK
P O WER W ATTS at 50
only, t he followi ng limitatio n s apply : Maxi-
mum co n tin u ou s op erati
n g
ti
m e at r ated c urr e n t (100% duty cycle)
i
n to α sh
ort ci r
c
u it is 20 nii n utes at 25 C am b ie n t, o r 10 m
i
nu tes at
40 ° C a
m bie n t . Alte rn atively d ur y cycle may be li m ited to 50% at
25 ° C a mb ie n t o r 25% at 40 ° C a mb
ie n t .( Α no r mal fa m ily of cu rves
fo r α tra n sisto r will pr o du ce α du
ty cycle effect to 50% o r less eve n
if o p erate d
co n ti nu o u sly
.)
Ove r dissipation of t he collector supply
will
te mp o
ra r ily s hu t it off and t urn on t he yellow CO LLE CTO R
S UPPL Y VO L TAG E DISA BLE D lig h t . Νο d a m age
will res u lt .
S
E
CTIO
N 1
S PE CI
F I
CA
ΤΙΟΝ
C hange information, if any, affecting
t h
is section
will
be
found at t he rear of the manual .
measureme n t . T h e horizontal d is p lay am p lifier allows
meas-
urement of both collector an d base voltage .
T he following electrical and environmental c h aracteris-
tics are vali d fo r instruments op erate d at an ambient tem-
pe r atu r e of from
+1 ρ
°C to +40 ° C after an initial ωα
r
Μιιρ
p erio d of 5 minutes, w hen p r eviously calibrate d at α tem-
p erat ιι re of +25 ° C ±5 ° C . Section 5, P er
formance
C h
eck
an d Calibration P roce d ure, gives αproce d ure for ch
ecking
an d adjusting t he Ty pe 576 with res p ect to t he following
s p eci f ication .
T he Ty p e 576 MOD 301W is α stan d ar d Ty pe 576 wit
h -
o u t t he R ea dout Assembly . All t h e information contained
in t h is manual pe r taini n g to t heR ea do u t
Assem
b ly
a nd
its
o p e r ation s h ould be dis r ega r d ed w h en use d i n co nj unction
wit h α mo d ifie d inst r ument .
Maximum
P ea k
Cu r rent ( N
ormal
Mo d e) ι
P ea k Cur r ent (Ste p
Ge n erator i nP ulse d
Ste ps Mo d
e)
Min imum Series
Resistance
Maximum Se r ies
R esistance
Series R esistance
Available
P
ea
k P ower W atts
Settings
Safety Inte
r
loc
k
Type576
10
Α

2 Α

0 .5 Α

0 .1 Α
At
least At least At least At least
20A

4
Α

1 Α

0 .2 Α
0 .3 Ω

6 .5 0

140 Ω

3 k Ω
65 k
Ω

1 .4 ΜΩ
6 .5 ΜΩ 6 .5 ΜΩ
0 .3 Ω , 1 .4 Ω ,6 .5 Ω ,30 Ω ,140 Ω ,
650 Ω , 3 k Ω , 14 k Ω , 65 k Ω , 300
k Ω , 1 .4 ΜΩ and 6 .5 ΜΩ , all with in
5°/ ο or 0 .1 Ω .
0 .1 W, 0 .5
W, 2 .2 W, 10 W, 50 W
and
220 W . Derived f r om nominal
peak op
en circuit collector voltages
and nominal series
r esistance values
at n omi n al li ne voltage
.
Wh en MAX PEAK VO L TS switc h is
set to eit he r 75, 350 or 1500, α p ro-
tective box must be in place ove r
test termi
n als and its li d closed be-
Ch a r acteristic
P
erforma
n
ce
Swee p Modes Normal mo de : AC (at line fre-
q uency) ; positive-or negative-going
full wave rectified AC .
DCmo de : positive o r negative DC .
DC Mo d e R i pp le Νο -loa d :
2°/
ο
or less of voltage, or
0 .1 % or
less of f u ll range voltage .
Voltages
Acc u racy Peak op en circuit voltages on all
r anges wit h in +35% and -5% .
R anges 15 V
75 V 350 V 1500 V

Sp ecification-Ty p e 576
L oo p ing Com p
ensation
fo r
e
voltage
can be a pp lie d . Amber
lig h t on i nd icates i n terloc k is open ;
R ed lig h t on in d icates voltage is be-
ing a pp lie d to test te r mi n als .
Cancels st r ay ca p acitance
between
collector test termi
n
al an
dg r oun d
i n Stand a r d Test F ixt
u re an d
all
Standa r d Test Fixt
u re Accessories .
Step Gene r ato r
2 Co
n tin u oυ s DC O u tp u t vs Ti
m e, Tem p erat ur e a nd D u ty
Cycle . 2 Α
co n ti nu o
u s DC ou t pu t can be ac h ieve d fo
r an un limite dpe r io d up
to 30 ° C amb ie n t . Betwee
n30 0 C a nd 40 ° C a mb ient,
2 Α co n ti n uo u s
DC op eratio n s hou
l d b e li m ite d to 15 m i nu tes or
li
m
ite d to α 50%
du ty cycle o
r less . Α fa m ily of ste p s (suc h as 10 ste p s at
200 mA per
ste
p
)
will a u tomatically r e du ce t h e du ty cycle to
50% even if ge n era-
te d co n ti nu o u sly . E xcee d i
n gt he rati ng will tem p o r a r ily s h ut
off
powe r to t hee n tire instrument bu
t
no da
m age will r es u lt .
R ipple Plus
N oise 0 .5% ο o r less of A MPL IT U D E switc h
setting or 4 ηΑ , p ea k to pea k .
V
oltage
M
ode
AM PL IT U D
E 50 m V to 2 V, i n 1-2-5 se q uence .
Switch R ange
M axim
u
m
Voltage 20 times A MPL IT U D E switc h set-
(Ste p s andAid
i n g ting .
Offset)
Maximum Cur r ent At least 2 Α at 10 V o r less, d e-
(Ste p sa nd Aiding r ating linearly to 10 mA at 40 V .
Offset)
S ho rt Circuit Cur-
20 mA, 100 mA, 500 mA, +100%-
rent L imiti n g (Ste p s 0°/
ο ; 2
Α +50% ο -0°/ ο ; as selecte d by
andAid i ng Offset) C URREN T L I M IT switc h .
Maxim u m Op p osi n g 10 times A
MPL
IT U D
E
switc
h
set-
Offset
V
oltage i
ng .
Maxim u m Opp osi n g L imite d betwee n 10 mA and 20
Current mA
R i pp le P lus N oise 0 .5% ο or less of A M PL IT U D E switc h
setting, or 2 m V , p ea k to peak .
Ste p R ates (
Fr ont p a n el R AT E button labels in
pa r ent h eses .) 1 times ( .5 Χ ), 2 times
(N
O
R M ) and 4 times (2 Χ ) line f r e-
quency . Steps occ u r at zero collec-
tor voltage w h en .5 Χ or N O R M
R AT E bu tto n s a r e p r esse d , an d also
at peak voltage w hen 2 Χ R AT
E
button is p resse d . Ste
p
s
occ u r
at
collector voltage
p eak and at
normal r ate w h en .5 Χ a nd2 Χ .
R AT E buttons a r e p r esse d toget h er .
P
ulse
d Step s Pu lse d ste p s 80 μ s o r 300 μs wide
wit h in
+20°/
ο , -5°/ ο p ro duced w he
n-
eve r one of t he PUL SE D ST
EP
S
buttons is p r esse d . P ulse d ste p s can
be
p r o
d
u ce donly at normal an d .5
times normal rates . Collector
Supply mode automatically be-
comes DC w h en eit h er t h e 300 μ s
or 80 μ s PUL SE D ST EP S button is
p resse d unless P O L A R ITY switc h is
set to AC . If t he 300
μ s
and 80 μs
PUL SE D ST EP S buttons are p r ess-
ed toget h er, 300
μ s
pulse d steps a r e
p r od uce d , but collecto r su pp ly
mo d edoes not c h an ge .
4ccuracy (Cu rrent o r
V oltage Ste p s, I n cl ud -
ng
Offset)
Incremental W it h in 5% b
etween any two ste p s,
Accuracy withou t .1 Χ ST
EP MUL T button
pr esse d ; wit h in 10%
ο wit h .1 Χ ST EP
Μ UL T bu tton p r
esse d .
Absolute
W it h i n 2°/ ο of total out p
ut, incl ud -
Accu r acy
ing any amou n t of offset, or
1°/ ο of
A MPL IT U D E switch setting,
w h ic h -
ever is g r eater .
Ste p (Current or One times or
0 .1 times (wit h .1X
Voltage) Am p litu d es ST EP MUL T bu
tton p resse d ) t he
AM PL IT U D
E switc h setting .
D FF S ET MU L T Con-
Co
n tinuously va r iable f r om CI to 10
trol R ange times A MPL IT UD E switc h setting,
eit h er ai d i ng or op p osing the ste p
ge n erator p ola r ity .
C ur re
n t Mode
AM PL IT U D E 200 mA to 50 ηΑ , in 1-2-5 se-
Switch R ange quence .
M aximum Cu rr ent 20 times A
MPL IT U D E switc h set-
(Ste p s a nd Ai d ing ting,
exce p t 10 times switc h setting
Offset ) 2 w h en switc h is set to 200 mA, an d
15 times switc h setting w he n t he
switc h is set to 100 mA .
Maximum Voltage
At least 10 V .
(Ste psand Ai d ing
Offset)
M aximum Opp osing A Wh
ic h ever is less : 10 times A MPL I-
Offset C u rrent
TUD E switc h setting, or between
10 mA an d 20 mA .
M aximum O p posing Between 1 V an d3
V .
Voltage

Ste
ps
an d Offset
P olarity
Step
Families
N umber of Ste ps
Correspon d s wit h collecto r sup ply
pola r ity
(positive going w hen PO-
LAR ΙΤΥ
switc h is set to AC) w hen
t heP O L A
R ITY I NVER T button is
release d . Is o p posite collector su p -
p ly p ola r ity (negative-going in
AC)
w hen eit he r t
he
POLARITY IN-
VERT butto n is p ressed o r t
he
L ea d Selector
switc h
is
set to BAS E
G RO UN D
E D . If
L ea
d Selector
switc h is set to BAS
E
GR O UN
D-
E
D,
P
O
L A R ITY I NVER T button
h
as no
effect
on
ste p s
an
d offset
polarity .
R ep etitive families of c h aracteristic
curves gene r ated with
REP ST EP
FAMILY bu tto np
resse d . Single
family of c
h aracteristic curves gen-
e r ate d eac
h time SI NG LE ST EP
F AM I L
Y
bu
tton is p resse d .
R an ges
from 1 to 10 as selecte d by
t he
NUMBER O F ST EP S switc h .
For zero
ste p s, p r ess SI NG LE ST EP
F AM Ι L
Y
bu
tton .
Dis p lay Am p
lifiers
Sp ecificatio n -Type 576
E xternal H
ori-
2 ο / ο 3 ο / ο 4 ο / ο 3 ο / ο
zontal (T h roug
h
I n te r face)
Leakage Collecto r
Su pp ly M o d e
Vertical E mitter 2 ο / ο ±1 3 ο /
ο ±1 4 ο / ο ±1 3 ο / ο ±1
Cu r rent
(VER T-
ηΑ ηΑ ηΑ ηΑ
ICA L Switch
set
between 10 ηΑ
and
2 mA)
Vertical Emitter Not A pp licable
5 ο / ο ±1 ηΑ
Current (VER T-
ICA L Switch
set to 5 ηΑ , 2
ηΑ or 1 ηΑ )
Η ο r ί z οη t αΙ
Collecto r or
Base Volts
VER TICA
L
switc h set
to :
1 μΑ o
r mo
r
e 2% ο 3 ο / ο 4 ο / ο 3 ο / ο
100 ηΑ , 10 N ot A pp licable 3% ο
plus
πΑ or 1 ηΑ 0 .025
V
fo r
eac h
vertical
d ivision
of
deflection
ο η t he
CRT
500 ηΑ , 50 N ot A pp licable 3% ο plus
ηΑ or 5 ηΑ
0 .125
V
for eac h
vertical
division
of
d eflection
ο π t h e
CR T
200 ηΑ , 20 Not
A pp
licable 3% ο plus
ηΑ or 2 ηΑ 0 .050
V
for eac h
vertical
d ivision of
d eflection
of t h e
C R T
Ste p Generator
Display
Dis p lay Acc u racies Dis p lay magnifie d (DIS-
Dis p lay
(οι '
οο f H ig h est On-
PL AY
O
FF S E T Selec-
Unmag-
Sc
r een Value)
f or switc h set to eit h er nifie
d
VER TΧ 10 or HO R IZ
X10) an d offset be-
tween
100 and
35 and10 and
40 divi- 15
d ivi- 0 d ivi-
sions
ions sions
N ormal and
DC
Collecto r Su pp ly
Mo d es
Vertical Col-
2% ο 3% 4%
3 ο / ο
lecto r
Cu r re n t
E xte r nal Ve r t- 2% ο
3% ο 4% ο 3%
ical (Through
Ι nterface)
H orizontal Col- 2% ο
3 ο
/
ο 4% ο 3 ο / ο
lector V olts
H orizontal
B ase
2%
3% ο 4% ο 3%
V olts

S p ecificatio n -Type 576
C R T and Rea d out
Ve r tical Ste p 3 ο / ο 4 ο / ο 5 ο / ο 4 ο / ο
Generator
H orizo n tal Step 3
ο / ο
4 ο / ο 5 ο / ο 4 ο / ο
Generator
Deflection Facto rs
Vertical
Collector Current 1 μΑ /division to 2 Α / d ivision in
1-2-5 se q uence .
E mitter Current 1 ηΑ / d ivision to 2 mA/ d ivision in
1-2-5 se q uence .
Step Generato r 1 ste p / d ivision .
H orizo n tal
Collector Volts 50 mV / d ivisio n to 200 V/divisio
n
in 1-2-5 se q uence
Base
V
olts
50 mV /division to 2 V/ d ivision in
1 25 se q uence .
In p ut Im p e d - At least 100 ΜΩ wit h H O R IZO N -
ance
TA L switc h set to 50 mV, 100 m V
an d 200
m V B AS E ; 1 ΜΩ wit hin
2
ο /
ο
wit h
switc h set
to
.5 V, 1 V
an
d
2 V .
Step Gene r ato r 1 ste p/d ivision
M aximum
Dis playe d
N oise
1 ο / ο or less, or
MAX PEAK V O L TS Switch
15
75 350 1500
Vertical
CO LLE CTO
R 1 Α 1 μΑ 2 μΑ 5 μΑ
E M ITT ER 1 ηΑ 1 ηΑ 2 ηΑ 5 ηΑ
H orizo
n tal
CO LLE CTO R 5 m V 5 m V 20 mV
200 m V
B AS E 5 mV 5 m V 5 mv 5
m V
Calibration C h ec k W it h DIS PL AY O FF S E T Selector
switc h set to N O RM (O FF ), s p ot is
d eflecte d10 d ivisions both vert-
ically and h orizontally with i n 1 .5 ο / ο
w h enever the CA L button is p r es-
se d .
W it h DIS PL AY O
FF S E T Selecto r
switc h set to Χ 10
M AG N I F I ER
(eit h er axis) the calib r ation
s p ot is
with i n 0 .5 ο / ο of ze r o s p ot
( p revious
Ιγ set to C R T
graticule cen te r )
w
hen CA L button is p ressed .
Vertical and Ηο r ί z- Coarse positioni ng in 5d ivisio n in-
ontal
P
osition Control c r eme n ts wit h in 0 .1 d ivision ; con -
tinuous fine p ositioning over at
least 5 d ivisions for each coarse pos-
ition .
Dis p
lay Offset Vertical or H o r izontal offset of d is-
p lay centerline value up to 10 d ivis-
io n s in 21 half d ivision ste p s .
Display
Positioning Sp ot p ositioning wit h ch ange in
Accuracy U sing P O L A R ITY switc h setting (usi ng
P
O
L
A R
ITY Switch
AC p osition as r eference), wit h in
0 .1 d ivision of :
V ertically H orizontally
AC
Centere dCen te r ed
+( ΝΡΝ ) -5 d ivisions -5 d ivisions
-( ΡΝΡ ) +5 d ivisio n s +5 d ivisions
CRT
Ty p e
E lectrostatic deflectio n .
Sc r een Size
Calibrate d area of 10 d ivisions by
10 d ivisions ; 12 u sable divisions
h orizontally (1 d ivision eq uals 1
cm) .
Ty pical Accel- 4000 V
lerating P oten-
tial
R ea d o u ts
Automatic d igitally lig h ted dis p lay .
R ea dout is
automatically blan ked if
rea d ings wo u l dbe outside t
he avail-
able r anges or would give er r oneous
d is p lay .
PER VER T DI
V 1 ηΑ to 20 Α calculate d from VER-
TICA L switc h setting, DIS PL AY
O FF SE T Selector switc h setting
and M OD E switc h setting (o r Χ 10
Vertical Interface I np ut) .
PER H O R IZ DI V 5 m V to
200 V calc u late d from
H O R IZO
N
TA
L switc h setting and
DIS PL AY O
FF S
E
T Selecto r switc h
setting
PER STEP S
5
ηΑ to
2
Α and5
mV to 20 V cal-
cu late d from A MPL IT U D
E switc h
setting an d .1 Χ ST
EP MUL T b ut-
ton p osition (or X10 Step I n
terface
In p ut) .

βο rg m
PER DI V
Ch aracteristic
Tem p erature
N ono p erating
1 μ to 500 k calculated from VER-
TICA L switc h setting, DIS PL AY
O FF S E T Selector switc h setting,
A
MPL IT U D E switc h setting, .1X
ST
EP MUL T button position, Χ 10
V ertical Interface In p ut an d Χ 10
Ste p Interface In p ut .
P ower R equiremen ts
Table 1-2
ENV I RO NMEN TA L C H A R
ACT ER ISTICS
-40 0 C to +65 °
C
Information
Specification-Ty p e 576
TA BLE 1-3
ME C HAN ICA L C H A R ACT
ER ISTICS
U
seful
O p
eration 0 °
C to +50
°
C
Specifie d Op eration +10
° C
to +40
°
C
Altitu de
N ono p erating To 50,000 feet
Operati n g To 10,000 feet
V ib r ation
O p erating
15 minutes along each axis at
0 .015
inc h with fre q ue ncy
varie d from
10-50-10
c/s in 1-minute cycles .
T h ree minutes
at any resonant
point o r at 50
c/s .
Shock
N ono p erating
30 g's, 1/2 si n e, 11 ms d uration, 1
s hock p er axis . Total of 6 shock s
Transp ortatio n 12
inc h p ac k age d ro p . Q u alifie d un-
der t
h eN ational Safe Tran sit Com-
mittee test p roce
d ure 1 Α .
P ower Connection T h is instrument is d esigne d
for
o pe r ation f r om p owe
r source wit h
its neu tral at or n ear groun d (eart h )
p otential . It is not inten ded fo
r
o p eration f r om two ph ases of
multi- ph ase system, or across
legs
of single- ph ase, t hr ee wi r e system .
It is
p r ovi de d with α t h ree-wire
p owe r cor d with three-terminal
p olarize d plug for connectio n to
t he p ower source . T h ir d
wire is
d i r ectly connecte d to
instrument
fr ame, and
is inten de d to groun d
t he
inst r ument to p r otect op erating
personnel, as recommen de d by
national an d inte r national safety
co d es .
L ine V oltage R anges 115
V AC 230 V AC
L ow
90 V to 110
V 180 V to 220 V
M e d ium 104 V to 126
V 208 V to 252 V
H ig h112
V to
136 V 224 V to 272 V
L ine F re quency R ange 48 to 66 H
z
M axim u m
P
ower
305 W,3 .2 Α
Consum
p tion at 115
V
AC,
60
H z
C h aracteristic
Descri p tio n
Dimensions
H eig h t
-15 i nch es
W idt h
-11 3/4 inc h es
De p t h
-23 1/4 inc h es
W eig h t
-69
lbs .
F inis h
F ront P anel (Ty p e
576 an
d Stan
d
ar d
Test Fixture)
Ano d ize d Aluminum
Cabin et lue vi n yl p ainte d aluminum
Trim and R ear
Pan el
Oatin finis h e d c hr ome

General
T
h is section of t he instr u ction
manual p rovi d es informa-
tio n necessary for operating t
he Ty p e 576 and for using it
to test va r ious semicond uctor
d evices . Include d are set u p
p r ocedu res, α d escription of t he
Type 576 controls an d
con n ecto r s, α d iscussion of t he t heory
of t he i n st r ume n t, α
first time o p eration p roce du r e, a n d
general op erating info r -
mation
. Also i n clu d ed is α section d
esc r ibing t he use of t he
Ty p e 576 for measu r
ing t he ch aracte r istics of various semi-
con d ucto r d evices .
Cooling
S
E CTIO N
2
O PER
A TI N G
I
N ST
RU CTIO
N S
C h ange info r mation, if any, affecti ng th
is section will b e found at
t h e rear of t he ma n ual .
I N ITIA L CO N SID ER
ATIONS
T he Ty p e 576 maintains α safe
op e r ating tem p e r atu r e
w h en op erate d in an ambient
tem p e r atu r e of 0 ° C (122 °
F) . A d e q uate clearance on all
si d es of t he instrume n t
s hou l d be p r ovide d to ass
u re f r ee air flow a nd d issi p atio n of
h eat away f r om t h e instrument
. Α t h ermal cu tout in t he
instrument p
r ovides t he r mal p rotection by d isconnecting
t h e p owe r to t he
i n strument if t h e i n ternal tem p eratu r
e
excee d sα safe op
e r ating level . Power is au tomatically
resto r e d w h en t he tem p
eratu
r
e r et u rns to α safe level . It
shou ld be noted t h at t he instrument
will tur n off un d e r
ce r tain conditions of h ig h collector su pp
ly cur r ent ou t p ut
or
h ig h ste p gene r ator cu r rent Output
even t h oug h t he
inst r ume
n
t is
being op erate d in an ambient tem p
erature
w h ic h is wit h
in t he s p ecifie d r ange . See footnotes in t he
Specification section for furt h er info r mation .
O p
erating V oltage an d F re q uency
T he Ty pe 576 ca n be ope r ate d fr om eit
h
er
α 115-volt or
α 230-volt
line voltage source . T he L I NE VO L TAG
E S E-
LE CTO
R assembly, locate d on t he rear panel, allows con
-
version
of t he instrument so t h at it may be o p
erate d from
one line voltage or t he ot h er . In a dd
ition, t h is assembly
c h anges t he connectio n s of t h e p ower
transformer p rima r y
to allow
selectio n of one of t h ree
regulating ranges (see
Table 2-1) . T he assembly also includes
t he two line f u ses .
Wh en t h e i nstrument is converte d from
115-volt to 230-volt
ope r atio n or vice versa, t h e assembly
selects t he p ro p er fuse
to p r ovi de t he correct p rotection for
t he inst r ument .
T he Ty p
e
576 may
be ope r ate d f r om eit he r α50 Hz
or α
60 Hz line
fr eq uency .
In
o r der to sync hr onize th
e ste p
ge ne r ato r wit h t he collecto r su p ply,
t he 60 H z-50 Hz
switc h , locate
d
on
t he Ty pe 576 r ea r p
anel below the L I NE
Ty pe 576
V O L TAG ES ELE CTO R assembly, must be set
to t he posi-
tion w h ic h corres pon d s to t he line fre q uency
being u
se d .
U se t he
following p r oce d u re to conve r t t h is instrument
between line
voltages, regulating ranges or line fre que n cies :
1 . Disconn
ect t h e inst r ument from t he p ower source .
TA BLE 2-1
R egulati ng R anges
F ig . 2-1 . Line V o
l tage Selector assembly an d 60 H z -50 Hz sw i tc h
on t h e rear
panel (s h own wit h cover removed) .
R eg u lati ng R an ge
R an ge Selecto
r 115 V olts
230 V olts
Switch
P ositio n N omi n al
N
omi
n al _
L O (switc
h bar in 90 to 110 volts
180 to 220 volts
left h oles)
Μ (switc h ba r in 104 to 126 volts
208 to 252 volts
mi dd
le h oles)
Η Ι (switc h bar i n 112 to 136
volts 224 to 272 volts
rig h t holes)

OperatingInstructions-Type 576
2-2
Fig . 2-2 .
Front-panel controls, connectors and readout .