HP 5383A Service manual

Ο Ρ Ε R Α Τ Ι Ν G ΑΝD
S Ε R V 1 C Ε

Μ ΑΝ
U Α L
HE W LE TT' P AC K A
RD
ii

FRE Q UEN CY CO UN T ER
5383
Α
O PER ATI N GAND S ERV IC E M ANU A L
S E R IAL PREF IX : 1508 Α , 1516 Α
T h is ma nua l a pp lies
d i r
ectly to HP
M o d el 5383 Α
Frequency Co
u nte r s h avi ng se r ial nu m be r pr efixes
1508 Α an d 1516 Α .
NEWER- I N ST RUM E N TS
T h is ma nu al, wit h enclose d "Manual C h a n ges"
s h eet, a pp lies to HP M o d el 5383 Α Frequency Co un-
te r s h avi n g se r ial nu mbe r pr efixes as liste d on t he
"Manual C h a nges" s h eet .
Co p y r ig ht

HEWLE TT- P AC K A R D ςΟΜΡΑΝ `l

1975
5301 ST EVEN
SC REEKBLVD ., SA N TA C L A RA, CA L I F . 95050
P ri n te d : M A R 1975
MA NUA L
P
AR T NUMBER 05383-90001
M IC R O F IC HE P A R T NUMBER 05383-90 Μ

PR I N T E D IN U .S .A .
HEWLETT & P AC K A RD

M
o
d
el 5383
Α
Table of Co
n
te
n
ts
ω
ΙΙ
I V
V
TA BLE O F CO N T EN TS
Section P
age
G ENER A L I NF O RM ATIO N . ............. . . ............ ........ ....... 1-1
1-1 .

I n t r o du ction ..... . . ............. . . . ........... ......... ..... . . 1-1
1-3 .

Inst ru me n t Description . .... . .... ..
. ........ . . . ........ ........ 1-1
1-5 .

Accesso r ies and Options ... . .... ..........
. . . . ....... ....... . . 1-1
1-8 .

Inst ru ment I de n tificatio n ... . . . ............ ........ . . . ...... ... 1-1
1-11 .

M icrofic h e Number ...... ... . . . ...... . ... ........ . . . . ...... ... 1-2
1-13 .

R ecommen ded Test Eq uipme n t ...... . . . . ......... . . . ....... ... 1-2
1-15 . Specifications ....... . . . . ..... . ...... . . . . ......... . . . ..... .....
1-2
INSTALLATION
....... . ... ... . .............
. . . .........
...... . . . .....
2-1
2-1 .

I n tro du ction .....
.............. . ....
........... ...... . . . . ....
.
2-1
2-3 .

U npac k ing and Inspection ...... . . ........... . ... ..... . . . ..... . 2-1
2-5 .

Sto r age and S h ipme n t ....... .... . .......... . . . ....... . . . ..... . 2-1
2-8 .

L i ne V oltage Selectio
n .... . . . .... . ......... ... . ......
......... . 2-1
2-11 .
M
ou
nting
. . ............ . . . ..... .
..... . . . ............
........ . .
2-2
OPERATION . . . . . ...... . ...... ..............
. . . .......
. ... ....... ... 3-1
3-1 .

I n t r oduction . ...... . . . ............... . . . ........ .......... .... 3-1
3-3 .

Co n t r ols, Con n ecto r s and in d icators

. . .......... ........ . . ..... 3-1
3-5 .

M eas ur ement Tec hn i ques

....... . ... ..........
......... . . ..... 3-1
3-7 .

R atio M eas u reme
n
ts (Sta nd ard Counte
r
Only) ......... . . . ..... 3-1
3-10 .

Operator C
h
ec
k
s ............... ......... . . ... ....... ...... . . . 3-3
4-1 .
4-3 .
4-5 .
4-7 .
4-9 .
4-11 .
4-15 .
4-17 .
4-19 .
T HE O RY OF O PER ATIO N ....... . . . . ............ . . . ......... .....
. . . .
4-1
I n t r o du ctio n . . . .......... . . . ............ ......... . . . ...... . . . . 4-1
Fu nctio n al Desc
r i p
t
i
on
. . ................ ......... . . . ..... .....
4-1
Input Ci
r
c u
its
....... . ... ............
. . . .......... . . .
..... .....
4-1
B
ala
n
ced
Inp u t Amplifier ........... . . . .......... ......... .... . 4-2
ΤΒΟ and
Main
Gate Ci r cuits ........ . . . .......... ..... . . . ...... 4-2
Scan Timing Ci r cuits ............. ............... ..... . . . ...... 4-2
Mu lti p lexe d Display Fun ction . . ... .......... . ... ..... . . . ..... . . 4-4
L ea d
ing
Ze
r o B
la
nk i ng ...... ... . . ......... . . . ....... . . . ..... . . 4-4
Un i qu e Integate d Ci r c u its ... ... . ......... ... . . ..... ......... . . 4-4
5-1 .
5-3 .
5-5 .
5-7 .
5-10 .
5-13 .
5-16
.
5-18
.
ΜΑΙΝΤΕΝ Α C Ε

................ .............. . . ........... ......... ...

5-1
Int r o du ction ..... . ... ................ . . . ....... . . ......... .... 5-1
In-Cabinet
P
e r fo r ma n ce C h ec k ...... . . . ....... . . . ........ ..... 5-1
A
dj ustme
n
ts .... ... . . ..............
...........
........... ..... 5-5
B
ala
n
ce
d I np u
t
Amplifie r
..... . ... .......... ........ . . . . .... .
5-5
Stan d a rd Time Base Oscillato r A
dju stme n
t . . ......... . . . ..... . 5-5
Option 001 Time B ase Oscillator A dju stme n t ......... ........ . 5-6
Inst r ument Access

...... . . . . .... . ....... ............. ..... . . . . 5-8
T r oubles h ooting ........ . . . ..... . ..... .............. ...... . . . . 5-9
V I

REPL AC E A BLE PARTS
......... ... . ...........
.......... . . ....... . . . . . 6-1
6-1 .

Int r od uction ..... . . . ... ............ . . . .......... ........ ...... 6-1
6-4 .

O r dering Information
.............
. . . .......... ......... ...... 6-1
6-6 .

LE D Dis p lay Digit O rd e r ing Infor mation

......... ........ .
...... 6-9
V II

MANUAL CHANGES
. . . ........... ... . ........... . ... ...... . . . ....... 7-1
7-1 .

Int r o du ctio n . . . ........ . . . .............. ... . ........ ......... . 7-1
7-3 .

Manual C
h anges
....
. .
.
. . ............... .......... ............ 7-1
7-5
.

Newer Instruments . . . . . ........... . . . .... . ...... ........... . 7-1
V III

SC HEM ATIC DIAG RA M S . . ................. .............. ......... . . . 8-1
8-1 .

Intro d uctio
n
.... . . . ................ . .
. ....... . . . . ......... .... 8-1

Table
10
LIST O F TA BLE S
P age
LIST
O F F IG
URE
S
M od el 5383 Α
L ist of Tables
L ist of F
igu r
es
F igu r e
P age
1-1 . M odel 5383 Α F re qu ency Co un te r ............. ........ . . . ...... . . . .... 1-1
2-1 . P ower Cor d Co nnecto r fo r 240- V olt O p eratio n
....... . . . ....... ...... . 2-2
2-2 . R ack M ou n ting I n str u ctio n s ........... ... . . ........ ........... ...... .
2-2
2-3 . R ack M ounting K it . . .... . ............ ... . ..... . . . .......... ....... . . 2-3
3-1 .
F
ront
P
anel
an d Internal
Co
n
trols,
In d
icato
r
s and Connecto rs . . .... . . ... 3-5
3-2 . R ear Panel O p erating Co
n
trols and indicators . ........... ....... . . . ... 3-7
4-1 . Simplifie d B loc k Diag r am . . . . . .......... . . . ........ . . . ........ ...... . 4-3
4-2 . Scan Timing W avefo r ms ... ......... . .... . . . ....... . . . ....... . . ..... . . 4-5
4-3 . U pd ate F unctio n .... .............. . . . ............ . . . ..... . . ....... . . 4-6
4-4 . 10S/ H z L eading Zero
B lan king F unction ........... ... . .... . . . ...... ... 4-7
4-5 . H ex M ulti p lexe d Counter A1 U 18 . ............ . . ......... ...... . . .... . 4-8
4-6 . V
a
r
iable
Time B ase
Co
un
ter
A1 U 11 . . . . ....... . . . ........ .......... ... 4-9
5-1 . Display
F
u
n ction T r ou blesh ooti n g F lowc h
a
rt
. ......... . . . ...... ....... . 5-9
5-2 . Co un te r F unctio n Troubles h ooting F lowc h a r t ........ ......... ........ 5-11
5-3 . M ulti p lexe d Display Bu s M o n ito
r
i n g .... . . . ......... . . . ...... ....... . 5-12
8-1
.
Sc
h ematic Diagram N otes
....... . ... ....
. .... . . . . .......... ....... ... 8-2
8-2
. M
ai
n B oar d
Sc
h ematic Diagrams . . . . .......... . . . ....... . . . . .... . . ....
8-5
8-3
.
Display B oard Sc hematicDiag r ams . . .......... .......... . . . .... ....... 8-7
1-1 . R ecommende d Test Eq uipment .... ... . .......... . . . . ...... . . . ..... . . . 1-2
1-2 . Specifications .......... . ........ .... . ......... ... . ........ ....... . . . 1-3
3-1 .
M
eas ur eme
n t Tec h niq
u es ... ............... . . ............ ....... ..... 3-2
4-1 . Sample an d Display Timi ng
.
......... . . ... ... . ........ . . ........ ......
4-4
5-1
.
In-Cabinet
Pe r fo r mance
C
h ec k
. . ..
............. . ... ......... . . ...... .
5-1
5-2
. Test
Co
u nter Set- U p
.......... . . . ............. . . . ......... .......... . 5-7
6-1 . Α 1 M ain B oa rd Assembly Pa r ts L ist ............ ............ ....... . . ... 6-3
6-2 . Α 2 Display B oa rd P arts L ist .............. . . ... ........ . . . ........ .....
6-6
6-3 . M iscellaneous P arts L ist ... . ........ . .... . . . .......... . . . ...... ....... 6-7
6-4 . M an u fact u re
r
s Co de L ist ........... . ... ... . .......... ......... ....... 6-8
6-5 . LE D Display
Digit P
art N umbe
rs
.... . . . . .......... . . . ........... . ........ 6-9
8-1 . M a j o r Signal Defi n itio n s
.... . . . . ............. ........... ... . .... . . . . . 8-3

G
ENE RA L
O PER ATIO N
S ERV IC E
SA
FE TY CO N SID ER ATIO N S
M
od el 5383 Α
Safety Conside r ations
Th is is α Safety Class Ι inst r ument . Th is instrument
h
as bee
n d esigned a nd teste d acco rd ing to I E C
P ublication 348, "Safety R e qu irements fo
r
E lect
r o n ic M easuring Appa r atus," and h as been
su p plie d in safe co
n
dition
.
BEF
O
RE A PPL YI N G P O WER verify t h at t h ep owe r t r a n sforme r p r ima
r y
is matc h ed to t he available
line voltage a nd t he correct fuse is installed (see Sectio n ΙΙ , P a
r
agra p
h
s 2-8 t
hr
oug
h
2-10) .
M
a
k
e
s ur e t h at only f u ses wit h t h e re q uire d rate d c u rr ent a nd of t
he s p ecifie d
ty p
e ( no r mal blow, time
d elay, etc .) a r e used fo rr eplaceme
n
t .
T h e
use
of r ep ai r ed f u ses a nd t he s h o r t-ci r c u iti ng of
fuse h ol d e r s must be
avoi ded .
Alt h oug h t h is
i n
st
r
ume
n
t
h
as
bee n d esigne d in accor d a nce wit h i n te r national safety standar d s,
t
h is ma nu al contains info r mation, ca u tions, a nd wa rn i n gs w h ic h m u st be
followe
d to ens u re safe
ope r ation a nd to r etai n t h e instrument in safe con ditio n . Service and ad ju stme n ts sh oul
dbe
pe r fo r med only b y qu alified se r vice pe r so nn el .
Any a dju stment, mai n tena n ce, a nd
r epair of t h e o p ened inst ru me n t und e r voltage s h o u l d be
avoi ded as
muc h
as
possible and, w h en inevitable, s h o u l d be ca rr ie d o u t only by α s k ille d pe r son
w ho
is awa
r e of t he h azar d i n volved .
Capacito
r s i n side t he inst r ume n t may still be c h a r ge d even if t h e i n st ru me n t
h
as been d isco
n -
n
ecte
d from its source of supply .
J&
ATTENTION AI
T h is symbol :
&
, w
h
ic
happ
ea
rs
on t
he i n st ru me n t in several places
means : R ead t
he i n
st r uctio
n man u al befo r e ope r ati ng t h e inst ru me n t . If
t
he
instrume
n
t is
operated wit h o u t r ead ing t h e i n st r uctio n s, it may n ot
ope
r
ate
correctly .

1-1 . I N TR OD U CTIO N
1-2 .

T h is sectio n of t
h
e
ma nu al gives α d esc r iptio n of t he i n st ru ment, i n fo r matio n on i n st ru me n t
i de n tificatio n a nd available o p tio n s, and comp lete s p ecificatio n s .
1-3
.
I N ST RUMEN T DESCRIPTION
SE CTIO N 1
G E
N
ER
A L I NF
O RM
ATIO N
M od el
5383 Α
Gene r al information
1-4 .

The HP M od el 5383 Α (see F ig ur e 1-1) is α d i
r
ect-co un ti
n g f r
e qu en cy cou nte rt h at
h
as α
r a n ge of 10 H z to 512 MH z .

N i n e d is p lay d igits pr
ovi de
α
r esol u tio n
of one Hz pe
r
secon d fo
r
inp u ts up to 512 MHz .

F r
o
n
t p anel
co ntrols
allow
α selection of gate times, i n p u t im ped ances,
a nd atte nu ators . Α
r
ea
r pa n el co nn ecto r a nd associate d selecto r switc h allow eit he r an exte rn al
time base oscillato r inp u t, o r monito r i ng of t he i n ter n al ti m e base oscillato r . Wh en t he op tional
tem pe r at u re compe n sate d c r ystal oscillato r (TCXO) is i n stalle d , t
he r
ea
r p
a
n
el co
nn
ecto
r
serves
only as α time base mo n ito r . In ad d itio n , α r ea
r p
a n el powe
r selecto r switc h pe r
mits t
he
5383 Α
Co un te r to ope r ate wit h li
ne
voltages
r
a
n gi ng fr
om 90
V
to 252
V (li n efrequency r ange : 48 το 440
Η z) .
1-5 . ACC E SSO R I E S
A N D O P TIO N S
1-6
.

Two
accesso
r ies a r e available fo r mo un ti n g t he 5383 Α coun ter o n to t h e u se r's r ac k . T h e
10851 Α kit p e r mits t he mo un ting of a single coun te r , w h ile t he 10852
Α
kit is u se d fo r m oun ti n g two
coun te rs i n α si d e- b y-si d e con fig ur atio n . Refe r to Section ΙΙ fo r d etaile d
r
ac k mo un ting kit
info r matio n .
1-7 .

O p tion 001 pr ovi d es α mo
r
e acc ur ate an d stable
time b ase oscillato r . T h is Tempe r atu r e
Com pen sate d C r ystal Oscillato r (TCXO) i n stallatio n mo d ifies t
he r
ea
r p an
el so
t h
at
t he conn
ecto
r
is u se d only as α M O N ITO R o utp u t . As α
r
es
u lt,
an
exte rnal sta nd a rd (i .e ., time base) ca nn ot be
app lie dto t he option
001 co un te r .
1-8
.I
N
ST
RUMEN T IDEN TI F ICATIO N
1-9 .

H ewlett- P ac k a rd u ses α 2-section, 10-c h a r acte r se r ial nu mbe r ( ΟΟΟΟΑΟΟΟΟΟ ) mou n te d on
t h e r ea r p a n el to i de n tify t h e inst ru ment . T he fi r st fo ur d igits a r e t he se rial p r efix a nd t he lastfive
d igits r efe r to t he specific i n str um ent . The alp h abetical c h a r acte
r i
den tifies t
h
e co un tr
y
of
manufacture . If t he se rial p r efix on yo ur i n st ru me n t diffe rs f r om t h at liste
d
on t
he
title p age
of t h is
man u al, t he r e a r e diffe r e n ces betwee
n
t
he
ma nu al a
nd
yo
ur i n st ru me n t . Any lowe r se rial
p r efixes a r e d ocu me nte d sepa
r
ately
i n
t
h
is
man
u
al,
a
nd h ig h e r se rial pr efixes a r e cove r e d by α
man u al ch a n ge s h eet i n cl ud ed wit
h
t
he
ma nu al
.
F ig ur e 1-1 . M odel 5383
Α Fre qu e n cy Cou n te r

M od el 5383 Α
Gene r al Informatio n
1-10 .

The p r i n te d circ u it boa rd s wit h i n th e i n st ru ment a
r
e i de
n
tifie
d
by α 2-sectio
n ,
10-
d
igit p a
rt
nu m be r (e .g ., 05383-60001) a nd α
4-
d igit se r
ies nu mbe r
(e .g ., "S ER
I E
S
1508") . The
se
r ies nu m be r
i
d e n tifies t he elect r ical c h aracte r istics of t he com
p lete pr i n
te
d -ci r c u
it
assem
b
ly . Α r
ep laceme
n t
ci r
c
u it-boa rd assembly may h ave α d iffe r en t se r ies n u mbe r t han t h e assembly o r igi n ally s upp lie d
wit h t he inst ru me n t . The r efo r e, w he n tr o ub les h ooti n g α ci r cu it-boa rd assembly, e n s ur e t h at t h e
se r ies nu m be r on t he sc h ematic d iag r am matc h es t h e se r ies nu mbe r on t h eboa rd assembly . If t h e
se
r ies
nu
mbe
r
of t
heassembly
is lowe
r
th a n t
he num
be
r
on
t he sc h ematic d
iag
r am i n Sectio n V
III,
r efe r to bac kd ati ng info r matio n i n th is manual fo r ch a n ge informatio n . If t h e se r ies nu mbe r on
t h e assem
b
ly is h ig h e r th an t h e nu mbe r on t he sc h ematic d iagram, t h e c h a nge i n fo r matio n is
p r ovi ded i nα ma n ual change s h eetw h ic h is available f r om t he nea r est H ewlett- Pack a rd Sales and
Service Office .
1-11 . M IC R O FIC HE NUMBER
1-12
.

On t
h
e title
page of
t
h is ma n
ual,
below t he ma
nu
al p a r t n um be r , is
t
h e mic r ofic h
e pa
r t
n umbe r . Th is nu mbe r may be u sed to o rd e r 4χ6 t r a n s p a r en cies of t h e ma nu al . The mic r ofic he
p ac k age also incl ud es t he latest Manual C h a n ge S upp lements as well as all pe r tinent Se r vice
N otes .
1-13 . RE CO MMEN D E D T E ST EQUIPMENT
1-14 . Table 1-1 lists test e qu i p me n t w h ic h is r ecomme nd ed for co n fi r ming i n st ru me n t
specifications (i .e ., i n -cabi n et p erfo r ma nce tests), as well as t r o ub les h ooti
n gand
adju sti n g t h e
i n
st
ru me
n t .
1-15 . SPECI F ICATIO N S
1-16 .

Table 1-2 lists t h e 5383 Α sp ecificatio n s .
Table
1-1 . R ecomme n d e d
Test
Equ ipme n t
Equ
ipme n
t Type
Re qu i r e d C ha r acte r istics Su ggeste d M od el U se*
Oscillosco pe 50 MH z Bandwid t h HP 180 Α System Α , Τ
Test Oscillato r 10 Hz to 10 MHz HP 651B P,T
50 m V O u tp u t
Sig n al
Ge
n e r
ato
r 10 MH z to 512 MH z HP 8654A P,T
50 m V Outp u t
D VM 0-25V R ange HP 970 Α Τ
Fr e qu e n cy Cou n te r H ig h stability 10 MHz HP 5328A with Option 10 A,P
f r e qu ency stan d a rd o r HP 5345
Α
50 O h m F eed t hru 50 O
h
m Te r mi n atio n HP
11048C
Ρ ,
Τ
Connecto r
* Α= Ad j ustments, Ρ = P e r fo r ma n ce Test, Τ = T r oubles h ooti n g

Ta b le 1-2 . S p ecificatio n s
M o d el 5383 Α
Ge ne r al Info r matio
n
FRE Q UEN CY RA NG
E : 10 Hz to 512 MH z
DIS P L AY : 9-segmente
d ( LE D) digits
I NPU T I MPE DA
NC E : T hr ee selectio n s :
50
Ω Χ 1 ( n omi n al)
1 ΜΩ Χ 1 (<40 pf s hun t)
1 ΜΩ Χ 10 (<40 p
f s hu nt, atte nu ation facto r of
10)
SE N SITI V ITY :
M AXI
MUM I NPU T :
ATT ENU ATIO N : Χ 10 i n
1
ΜΩ
ACC U RACY : ±1 Co un t ±
Time B ase Accu r acy
GAT E TIME : Manually
selecte d .1 secon d , 1 seco
nd , 10 seco nd s
RE SO LU TIO N :
* F o r exa mp le : T h e m axi mu m sig n al level
(w h
e
n 1 ΜΩ Χ 1 i npu t i m pe da n ce is
slecte d ) fo r α 100 kH z i npu t is :
100 Χ10 3 2 .5 Χ10 7 = 250
V ( rm s) + 200 V d o
I NPU T
Switc h P ositio n Fr e qu
en cy R ange
Sensitivity (RM S)
50
Ω Χ 1 20
Hz to 100 MHz
25 mV
100 MHz to 512 MHz
50
mV
1 ΜΩ Χ 1
10 Hz to 10 MHz
25 m V
10 MHz
to
50 MHz
50
mV
I NPU T Switc h P ositio
n Fr e qu en cy R a nge
M axim u m
50 Ω Χ 1 ( Fu se pr otecte
d ) 20 Hz to 512 MHz
3 .S V r ms
(+24 dB m)
1 ΜΩ Χ
1 10 Hz
to 40 H z 200 V (S um
of do + pea k αι )
40 Hz
to 100 kH z 200
V d o + 250 V r ms (ac)
100 kH z to 5 MH z
200V do
*2
.5
χ 10 7 V r ms
=
(ac)
Fr e q .
(i n
H
z)
5 MHz to 512 MHz
200 V d o + S
V
r ms (ac)
1 ΜΩ
Χ 10 10 Hz
to 40 Hz 200 V (S u m of
do + pea k ac)
40 Hz to 1 MHz 200
V d o + 250 V r ms (ac)
1 MH z to 50 MHz
200
V d o
+
2 .5 χ 10 8
V r ms (ac)
Fr eq . (in Hz)
50 MHz
to 512 MH z 200
V d o + 5 V r ms (ac)
GATE TIME
L east Significant
Digit V alue
.1s/ MH z
10 Hz
1s/MHz
1 .0 Hz
10s/Hz
0 .1 Hz

tι
M o
d el 5383
Α
Ge
n e r al I
n fo r mation
TI MEB AS E DATA :
Stan d a rd
Fr e qu en
cy : 10 MH z (Xtal Oscillato r )
Acc ur acy : <±3 ppm pe r mo n t hdue to agi
n g
<±2 .5 p pm du e to
tem p erature va r iatio n s b etwee n 0°C a nd 40°C
<+0 .5 pp
m du e to ±10% line ( p owe r ) va r iatio
n
Rea
r Pa n el R atio Inpu t : 100 kH z to 10 MHz
E xter n al Fr e qu ency Sta nd a rd I
npu
t ( r ea
r p a n el) : 10 MHz
Se n sitivity : 250 m V
r
ms
Impedance : >500 Ω
M
aximum I npu t : 10 Vr ms
Monitor
Output : Fr e qu ency : 10 ΜΝτ Timebase
V oltage : 200 m V pea k-to-peak
i n to 50 Ω
Cont r ol : Active
w he n t he ΙΝΤ / ΕΧΤ switc h is t he ΙΝΤ position .
O p tio n 001
(Does not p r ovi d eα r ea r pan el exte rn al timeb ase
i npu
t c4 p
a b ility)
Fr e qu ency : 10 MHz (Tempe r atu r e Com pe n sate d Xtal
Oscillato r )
Acc uracy : <±0 .1 p pm pe r mont h due to aging
<±1
p
pm du e to tem p erat ur e va r
iatio n s betwee n 0°C a nd 40°C
<±0 .1
pp
m due to ±10% line
(
p owe
r ) va r iation
O PER ATI NG T EMPE
RATURE : 0°C to 40°C
PO
WER
RE Q U
I REMEN TS : 100, 120, 220, a nd 240 Vr ms ; 48 Hz
to 440 Ητ , +5%, 10% ;
20 V A max .

'
WE IG H T : N et : 2 .2 k g (4 .75 lb) . Sh
ipping : 2 .7 kg (6 lb)
DIMENSIONS : 89mm Ηχ 159mm
W χ 248mmD(3 .5i n Ηχ 6 .25i n . W χ9 .75i n .D)
Table 1-2 . Specifications
(Conti n ue d )

ι

M
o d el 5383
Α
I n stallation
2-1 . I N T R OD U CTIO N
2-2 .

T h is sectio n of t
he
ma nu al
p
r
ovi d
es
i n
fo
r
mation a bou t
unp
ac
k i n g, i ns
p
ecti n g,
sto r i n g, a nd
s h i pp i n g t h e frequency co un te
r .
2-3
. UNP AC K I
N
GA N D
I N
SP
E CTIO N
2-4
. If t
he
s
h ip p i ng carto n is d amage d , as k th at t he ca rr ie r 's agen t be p r ese n t w hen th e
i n st ru me n t is un pac k ed . I n spect t he i n st rum e n t for d amage s u ch as sc r atc h es, d ents, b r o k en
switc h es, etc . If t he i n st ru me n t is d amage do r fails to meet perfo r ma n ce tests, n otify t he ca rr ie r
and th e n ea r est H ewlett-
P
ac ka rd Sales a nd Service Office imme d iately . P erfo r ma n ce c hec k
p r ocedur es a r e locate d i n Sectio n V, a
nd Sales a nd Service Offices a r
e
liste
d at
t he
bac k of t h is
ma nu al . R etain t
he s h ip p i n g
carton
a nd th e pa dd i ng mate r ial fo r th e ca rr ie r 's i n s p ectio n . T h e
Sales a nd Service Office will a rr ange fo r th e r ep ai r o r r e p lace m en t of t he i n st ru me n t wit h o u t
waiti ng for t h e clai m agai n st t he ca rr ier to be settle d .
2-5 . STOR AG E AND S H I PMEN T
2-6 .

P AC K AGI NG .
To
p r otect val uab le elect r o n ic e qu i p me n t dur i n g sto r age o r s h ipme n t,
always use t he b est pack agi n g met h o d s available . Yo ur H ewlett- Packa rd Sales and Service Office
can pr ovi de p ac k agi n g m ate r ial s u c h as t h at u se d fo r o r igi n al facto r y p ac k agi ng . Co n t r act
pack agi n g com p a n ies i n ma ny cities ca n pr ovi de d epe nd able c u stom pack agi n g on s h o r t n otice .
2-7 .

ENV I R ONMEN T . Co nd itio n s dur i n g sto
r
age a nd s h ip m e n t s hou l d no r mally be limite d as
follows :
α .

M axi mu m altit
ud
e :
25,000
ft .
b .

M i
nimu m
tempe r
atu
r e : -40° F (-40°C) .
ε .

M aximu m tempe r atu r e : +167° F (+75°C) .
2-8 . L I NEV O L TAG E SELE CTIO N
S E CTIO N 11
I N STA LL ATIO N
2-9 .

T h e coun te r is s
upp lie d f r o
m
th e facto r y wit h th e
LI NE
V
O
L TAG E S ELE
CTO
R switc h
es set fo
r
120-volt . If
any othe
r supp ly voltage is to be u se d , c h a n ge t h e r ea r - p anel switc h setti n
gs
as
follows :
α .

U si ng α small sc r ew dr ive r , α pe
n
cil, o r ot he r su itable tool, set t h eL I NE V O L TAG E
S ELE CTO R switc
h
es on t
he co
un te
r's r
ea
r
pan el to t
hep
ositio
ns
s
h own n
ext to t he
d esire d voltage ma
rk i ng
on
t he rea
r pan el
.
b .

En s
ur
e t h at t he co rr ect fuse is installed . U se
αL
iste d , 0 .250 am pe re, slow-blow f u se fo r
100-volt o r 120-volt operatio no r αL iste d , 0 .125 am p e r e, slow-blow f u se fo r 220-volt o r
240-volt ope r ation .

M o d el 5383
Α
I
n stallatio n
2-10 .

If t
he co
un te
r is
to be
u se d in t he U
SA
wit h α
240-volt,
60 Hz powe
r
so ur
ce, u se αpo w e r cord wit hα
Liste d
co
n necto r
of
t he type s h own i n F ig ur e 2-1 .
2-11 . M O UN TI NG
2-12 . The 5383 Α Fr e qu
ency
Co
u nte r is
b
u ilt to be
p o
r table,
an
dmay
be
u
se
d at
any
test ben c h position .
Two kits are availa b le fo r t he u se r w h o d esi r es to
m o un t h is cou n te r on α r ack . K it 10851 Α pe r mits o n e
co un te r to be mo u nte d i n t he cente r of αrac k ,
w
h ile
K it 10852 Α allows t he u se
r
to mo un
t
two co
un
te
r
s,
si d e- b y-si de on
α
rac k . F ig ure 2-2 d esc r i b es h ow to
mount t h e cou nte r o n to t he rac k pr ovi ded . F igu r e 2-3
s h ows t h ese k its a nd p rovides α com ponen t pa r ts list .
F igu r e 2-2
.
R ack M oun ting Instructio n s
F ig u re
2-1
. P owe r Cor d Co nnecto
r
fo
r240- V olt
O p e ratio
n
1 . REMOVE BOTH PL ASTIC FEE T FR O M I N ST RUMEN T .
2 . L OOS EL Y I N STA LL STA N DO FF S BETWEEN SC REW HO
LE
S IN BR AC KE T .
3 . PUSH I N ST RUMEN T T HRU PR O F I
LE
D C U TO U T
IN
BR ACKET .
4 .
TIG HT EN C L AMP I NG SC REW S .
L .-O f

M o d el 5383 Α
Installation
fig ur e 2-3 . R ac
k
M
ou n ting K it
2-3
Q UANTITY
PART
DESC R
I
P
TIO
N
KIT KIT
NUMBER
1085 1 Α
0
852
Α
Ο
2360-0200
6/32- .51NC H4 6
FLAT
H EAD SC REW
ΟΘ 0380-0988
HEX FEM A LE
23
STAND O FF
© Ι 085 Ι -00001
RACK MOUN TING
Ι
-
BRACKET(SINGLE)
Ορ 10852-00001
BR
AG DO UBL E ) - Ι

3-1,
I N TR OD
UCTIO
N
3-2
.

Th
is section
co n tai n s d esc r i p tions of t he con trols, co nn ecto r s a n d i nd icato r s, meas ur e-
me n t
tec hn i qu es, a
nd ope
r
ato
r
c
hec k
s .
3-3
. CO
N TR O L S, CO
NNE CTO R S AN D I N DICATO R S
3-4
.

F
ig ur es 3-1 a nd 3-2 d esc
r i be t he o
p
e r atio n of
t
h
e 5383
Α co n tr ols a nd t he f
un ctio n of
t h e
va rio u s co nn ecto
r s and i nd icato rs . The followi n gp arag r a ph s also pr ovi de op
erati
ng
g u ideli n es and
b r ief ope r ato r main te na n ce pr oce dur es for t h e fr equen cy coun te r .
3-5 .
M EAS UREMEN
T T E C HN IQ U ES
S E CTIO N III
O PER ATIO N
3-6 .

N oise
r idi ng on t h e in pu t sig n al ca n ca u se e rr o n eo u s o r un stable f r
eq
ue n cy
meas
ure-
m e
n
ts
. U sing t h e i n ter n al Χ 10 atten u ato r , o r exte rn al attenuato rs mi n imizes t h is pr oblem .
Pr op er selectio n of t
he i npu
t
imped
a
nce
also allows fo r stable a nd acc ur ate fr equ ency mea-
s ur eme n ts . Wh e
n
t
he r e is α d iffe r e n ce betwee n t h
esig
n
al so
ur
ce
i mp
eda
n
ce and t h e co un te r
in pu t impe
dan
ce,
r i n gi ng may appea r
on
t he sig n
al
.
Th
is r i n gi ng
cou
l d i n
te
r
fe r e wit h , a nd
d eg r ade t
he capab ility of t he cou n te r .

Kn owle d ge of t h
e
sig n
al
so ur
ce
ci r
cu it c
h
a
r
acte r istics
a nd selectio n of com p atible 5383 Α i npu t impe d an ces and atte n uatio n pe r mits
proper
mea-
su r ements . Table 3-1 (page 3-2) pr ovides some s u ggeste d meas ur eme n t tec hn i qu es to h elp
t
he
use
r
o b tai n m axim
u m u
se of t
he f r
eque
n
cy co un te
r .
3-7
.

R
atio
M
easu
r eme n ts (Sta nda rd
Co
un te rOnly)
3-8 .

T he sta nd a rd coun te r will meas ur e t he r atio betwee n t he fr e qu e n cies of two signals if o ne
of t he sig nals is a pp lie d to t he r ea r -pa n el OSCI LL ATO R - ΕΧΤ IN co nn ecto r a nd t he ot he r sig n al is
app lie d
to t
he fr
o nt- p anel I NPU T co nn ecto r . (T he O p tio n 001 co un ter
does n
ot
h
ave an exte
rn
al
oscillato r i npu t
conn
ecto r .) Be
su
r
eto
r
efe
r to Ta
b le
1-2
fo
r sig n
al
level a nd f r
equ
ency limits . T h e
d is p laye d val u e is i n un its w h ic h r
e pr
esen t t h e r atio of one frequency to t he ot he r as s h own by t he
followi
ng fo r m u la :
f r equ ency at fr ont p a n el I NPU
T

__

Dis p lay V
al
ue
fre q at r ea r p an el OSCI LL ATO R - ΕΧΤ
IN

Χ
10 if GAT E TIME is As
w h e r eΧ =

10 if GAT E TIME is is
J10 7 if GAT E TIME is 10s
3-9 .

N ote t h at in
t
he
above fo
r
m u la t he te r
m "
Χ "c
ha
n ges by
α facto r of 10 7 w henα 10s GAT E
TIME is
set . The GAT E TIME is t h
e same
w he n1s a nd 1s selectio n s a r e ma de . N ote, also, t h at
act
u al
meas ur eme n t time inc r eases as t he f r e qu ency ap p lie d to t he OSCI LL ATO R - ΕΧΤ IN
conn
ecto r
dec r eases . 1f t h e fr equen cy a pp lie d to t h e OSCI LL ATO R - ΕΧΤ IN co n necto ris 1 MHz,
fo r
example,
a nd GAT E TIME is set to 1s, act u al meas ur eme n t time will be 10 second s .
M
o d el 5383 Α
Ope r atio n

M o d el
5383 Α
Operatio
n
Table 3-1 . M eas ur eme n t Tec hn iq u es
R ecomme nd ed 5383 Α
Sig n al Sou r ce R ecomme nded Co
nn
ectio
n Im pe d an ce/Atte nu ato r
Selectio n
1 . Sig n al Ge n e r ato r s,
o r cir- V ia Coaxial cable o r 50 oh m 50 Ω Χ 1
c u its with o u t pu t :
oscillosco
pe
pr obe system
(e .g ., HP 10020 Αo r
α . Frequency r a n ge f r o m e qu ivale n t)
10 MH z to 500 MH z
b . L evel less
t h
an
3
.5
V
( r
ms)
o r +24 dB m
ε .
Im p e dance of 50 Ω
2 . Sig n al Ge ne r ato r s, o r ci r - V ia exte
r
nal 50
o h m coaxial 50 Ω Χ 1
ci r c u its wit h output : atte nu ato r a nd coaxial cable
α . Frequency r ange f r om
10 MHz to 500 MH z
b . L evel excee d i n g 3 .5
V
( r ms) o r m o r e t h a n
+24
dB m
c .
Im ped a nce
of 50 Ω
3 . Sig n al
Ge
n e r ato r s, ci r - V ia ap pr o pr iately te r mi- 1 ΜΩ Χ 1
cu its w it hou tp u t f r e- n ate d coaxial cable, 1 ΜΩ 1 ΜΩ Χ 10
q uency less t h an 50 oscillosco pe p r o be (e .g ., HP
MH z, o r
h
ig h voltage 10004D o r e qu ivale n t)
ci r cuits
4 . 10 H z
to 100
kH
z
sig n als V ia coaxial ca b le
o
r oscillo- 1 ΜΩ Χ 1, o r 1 ΜΩ Χ 10 wit h
wit h h ig h f r
e qu
e n cy scope p r obles i n te rn al 100 kH z low p ass
noise compo n ents filte r selecte d (see F ig ur e
3-1, item 6)
5 . T
r
ans m itte r o
r
ot
he
rh
ig h
DO NOT CO NNE CT DI-
50 Ω Χ 1
voltage oscillato r RE CT
L
Y
TO CO
UN T
ER IN-
circuits PU T! U se α pick-up a ntenna
a nd pr op e r atte nuato r s .
NOT ΤΗΕ T RA N S M ITT ER
ANTENNA!
6 . H ig h frequency, h ig h DONOT CO NNE CT DI- 50 Ω Χ 1
p owe r , h ig h i mp edance RE CT L Y TO CO UN TER IN-
circuits PU
T!
U se an
in
du ctive loop
pick-up d evice a nd a ppr o-
pr iate atte nu ato r s
7 . H ig hf r e qu e n cy, h ig h Active pr obe system (e .g ., 50 Ω Χ 1
im pe
da
n
ce low
powe r HP 1120 Α o r e qu ivalent)
ou t pu t NOTE : Α p r obe p owe r sup-
ply (e .g ., HP 1122 Αo r
eq uivale n t) is r e qu i r e d,
passive atte nuato r pr obes
8 . H ig h frequency
sig
n
als
Coaxial cable
wit
h do bloc k - 50 Ω Χ
1
wit h α d o level ot he r ing capacitor (e .g ., HP
t han ze r o volts 10240 Βo r eq uivale n t)

3-10 . O PE RATO
R C HE C K S
3-11 .

Th ese qu ic k pr elimi
n a ry c hec k s s h oul d be pe r fo r me d by
t heope r ato r w he n an i n st ru me n t
fail ur e is s u specte
d :
Pr
oble
m Ι . Νο d isplay d igits are
illumi n ate d
CHECK
α .

Equ i p ment ca b le p
l u gge d i n?
b .

Pr o pe r
li ne voltage selecte d on r ear p a n el? (
R efe r to Pa r ag r a ph 2-8 .)
ι . Rea r p a n el f u se blow n ? R e p lace
blow n f u se wit h α/4 am p 3AG
f u se (HP Pa r t
N umber 2110-0018)
fo r 100-120 volt o pe r atio
n
or α am
p
(HP
P a r t Number
2110-0318) 3AG
f u se fo r 220-240 volt ope r atio
n .
Pr ob lem ΙΙ . All d is p lay d igits are not
ill
u
mi n
ate
d .
α . T
h is is n o r mal, T h e co un te
r pr ovi d es αlea d i ng ze r o b lan k i n g feat ur e w
h
ic
h
bla nk s
non-significant
d isplay d igits . T he followi n g d is p lays a
r
e
co rr ect w hen αsig n al is
n ot a p plie d to t
he cou n te r inp u t :
GAT E TIME
Switc h
Position
10 S/
H z
1 S/ ΜΗτ
.1 S/ ΜΗτ
DISPL AY
M
od
el 5383 Α
O pe r atio n
Ι

ΙΙ

ΙΙ

ΙΊ ΙΙ

ΙΙ

ΙΙ

Ι
Ι

Ι , Ι

Ι Ι - Ι Ι

Ι Ι - Ι Ι _ Ι Ι - Ι
Ι

Ι

Ι

Ι

Ί Ι

Ι

Ι

Ι

Ι

Ι

Ι
Ι -
ΙΙ ΙΙ - ΙΙ - ΙΙ -
Ιι
-
ι
b . Fo r f ur t h e r ass u ra n ce, set t
h
e GAT E
TIME switc h betwee n any two p ositio n
s . T h e
followi n g d is p lay i nd icates t
hat all d isplay d igit ci r c u its a r e ope
r
ati
n g
co
rr ectly :
I it
II- ι1
ι
ι
ίι
ίι ίι -
ιΙΙ Ι Ι
ι _
ι ι
ι
ι _
ιι _ ι
ΝΟΤΕ
Whe
n positione d fo r th e d is p lay digits test
f
u
nction, GAT E TIME
switc h
AlS2
may o r may n ot op en t he g r o und lea
d to t he d eci m al
p oi n t input of t h e d isplay LE D . Fo
r t h is r eason t he d ecimal poi
n
t
mayo r m ay not be
ill uminated d ur i ng t h is d igit test .

M o
d el 5383 Α
Ope r atio n
Pr oblem Ill . T he fr equ ency co un
ter is n ot
coun
ti n g t h e in pu t sig n al .
C HE C K :
α .

Is t he r ear pan el ΙΝΤ/ ΕΧΤ switc h i n t he ΙΝΤ positio n ? (T h is switc h exists i n t h e sta nd a rd
coun te r only .)
b .

Does t h is pr oblem occ ur only
w h
e n t
h
e
fr
o
n
t p a n el I NPU
T switc h is i n t he50 Ω Χ 1 o r 1
ΜΩ
Χ 1 positio n ? T h is
i nd
icates t h at t he
i
n te rn al f u se, A1
F
1, is
blow n . R emove i n
st
r
ume
n
t
cove
r
s to gain access to
t h is f u se (refe r to P a r ag r a ph 5-17, n ote W A RN I NG) . R ep lace f u se
wit h s p are p r ovi ded on t he M ain Boa rd Assembly . Or de r a n ot h e r f u se (HP P art Nu mbe r
2110-0436) .
ΝΟΤΕ
REMEMBER TO KEEP ΤΗΕ I NPU T SIG N A L LEVEL BEL O W 3 .5 V
( RM S) O R +24 D BM WHEN ΤΗΕ I NPU T S W ITC H IS IN ΤΗΕ 50 Ω
Χ 1!
ι .

Does t h is pr oblem occur οηΙ ;- w
h
en t h e
I
NPU
T switc h is i n t he 1 ΜΩ Χ 1 o r Χ 10
p ositio n s a nd t h e i npu t fr e qu ency goes
h ig h
e
rt h an 100 kH z? R emove t he cove rs
( r efe r to P a r ag r aph 5-17, note t
he
W A RN
I
NG) .
Set t h eboa rd -mo u nte d F I L T ER
switc hto t h e left (i .e ., away
fr
om
t he ">") .
3-12 . F inally, t h is q uic k andco
n
ve
n
ie
n
t loop-around
c heck is p r ovi ded to ve r ify n o r mal
ope r ation of t he
i
n str u
m
e
n t :
α .

Set
t he rea r pa n el ΙΝΤ /ΕΧΤ switc h (exists on t he sta nd a rd coun te r only) to the INT
p ositio n .
b .

Set t he fr o n t pan el I NPU T switc
hto
t
he
50 Ω Χ 1 p osition
.
ε .

Co nn ect α coaxial ca b
le
b
etween t h e r ea r p a n el OSCI LL ATO R j ac k a nd t he fr ont p a n el
I NPU T j ac k .
d . 10 MHz d is p lay (±1 least-sig n ificant d igit) i nd icates t hat t h e coun te ris ope
r
ati ng
- - no r mally .
e . Fo r loop-around chec k of t he 1 ΜΩ Χ 1, o r Χ10 I N
PUT
p at h s, u se α 500
Feed t hru
con n ecto r (see Table 5-1,
test
2 items e,
f, g .) .
3-13 .

If, afte rt h ese ope
r
ato
r c heck s a r e pe r fo r me d , t he coun te r d oes n ot ope r ate no r mally,
r efe
r
to the Troubleshooting C
h arts : F ig ur e 5-1 a nd 5-2 in Sectio n V fo r fa u lt analysis p r oce dur es .

M od el
5383 Α
O pe
r atio n
1 . DISPL AY :
3 .
α .

N
i n
e LE
D (lig h t emitti n g d io d e) d is p lay
d
igits a
r e p r ovi ded .
b .

Α d ecimal p oi n t i nd icates
d is p lay r esol u tio n for each GAT E TIME
selectio n .
c .' An ove r flow i nd icato r ( d ot at t
he upp e r left p ositio
n ) s h ows w hen t
he
in pu t f r e-
qu en cy h as excee ded t
heco un ti ng ca p ability of t
he instr u ment .
d . Lead i n g ze r o bla nk ing s u rp
r esses d is p lay of
non-significant d igits ( r efe r to P a r a-
g r a ph 3-11) .
2 . LINE switc h : T
h
e ac
powe r L I NE switc h is α pu s
h
ON,
p u s h O FF ty pe . Wh en ON,
t h e
F ig
ur e 3-1
. Fr on t P a n el a nd i n te r n al Co n t
r ols, I nd icato r s a nd Co
n necto r s
3-5
pu s hbu tto
n is set f u rt h e r
GAT E TIME
switc h :
α . M eas ur eme
n t Time selects
r esol u tio
n s :
into t he
f r
on
t p anel .
one of
t h e followi ng
meas ur eme n t times a
nd d isplay
The Decimal Point is
GAT E TIME Switc h P ositio
n M easur ement Time
Positioned so t h at Dis p lay
R ead s IN :
.1 S/ ΜΗτ
1/10 seco nd
MHz
1 5/MHz
1 seco nd
MHz
10 S/ Ητ 10 second
s Hz

α
M
od
el 5383 Α
O pe r ation
b .

Wh e n t h is switc h p ositio n is c h a n ged , t he frequency cou
n
ti
n g
ci
r c u its a r e automati-
cally r eset to ze r o co u nt . T h e n ew f r e qu e
n
cy
cou nt is t h e n d isplaye d afte r αd elay
w h ic h is d ete r mi n ed by t h e GAT E TIME positio
n (i .e ., t he meas ur ement time) .
ι .
Digit self-test p r ovi d es α d is p lay d igit self-test capab
ility .
Wh en
t h is switc h is set
b etwee n two GAT E TIME positio n s, all d isplay
d igits s h oul ds h own "8" (see
NOTE i n Pa r ag
r
a ph
3-11) .
4 .

I NPU T switc h : Selects one of t he followi n g i npu t im
ped ances a nd atte nu atio n s :
50 Ω Χ 1

T h is inp u t is pr otecte d f r om i n pu t sig
n
als
t h at excee d 3 .5 V r ms (+24 dB m) by an
i n te rn al 0 .1 amp f u se ( r efe r to Pa r ag
r
a ph
3-11) .
1 ΜΩ Χ 1 S hun t cap acity : less t
h
a
n
40 pf
.
1
ΜΩ
Χ
10 Shu
nt capacity : less t ha n 40 pf .
5 .

I NPU T conn ecto r : Co nn ects sig n al to b e meas
ur
e
d to i n te rn al ci r c u its . I mp e da n ce a nd
atte nu atio n at t
h
is j ac
k
is
selecte dby I NPU T switc h .
6 . I N T ERNA L F I L T ER
switc h ( n ot s h ow n , see Fig ur e 8-1) : T h is switc h is positio ned i n t he
d i r ectio n of t h e ar r ow (">") to select α 100 kH z low pass filte
r .
T
h
is
filter pe r mits
sta b le f r e qu en cy meas ur eme n ts i n t h e 10 Hz to 100 kH z
r
a
n
ge
w hen t he i n p u t
contai n s h ig he r f r e q uency n oise .
3-6
Fig ure 3-1 . Fr o n t P an el a nd I n ter n al Cont
r ols, I nd icato r s a nd Co nn ecto r s (Co n ti nu e d )

4-1 . I N T R OD U CTIO N
42 .

The t h eo r y of ope r atio n is w r itten p r ima r i l y at α f un ctional bloc klevel . Some d etaile d
ci r
c
u it t h
eo
ry
is p
r ovi ded as an ai d to t r ou bles h ooti ng w h en ci r cuit com p lexity r equ i r es it . In
a dd itio n ,
br
ief ci r cu it expla n atio n s a r e give n fo r two un i que integ r ate d ci r cuit p ac k ages
:
t he
Va ria b le Time Base Co un te r a nd t heH ex M ulti p lexe d Co un te r s .
4-3 . FUN CTIO NA L D E SCR IPTIO
N
4-4
.

T h
e 5383 Α
is α d i r ect fr
equency co
un ti ng i n st ru me n t w h ic h comp u tes i npu t fre quen cy "f"
by cou n ti n g t h e nu m b e r of cycles "η " t hat occ ur s dur i ng an i n te rn ally gene r ate d time b ase
i n te rval "t" . T h is fr e quen cy meas ur ement
f
un ctio n is d escri bed sim p ly by t he followi ng
equ atio n :
η =fxt
η = n um be r of cycles
f = fr equ e n cy of i npu t sig n al
t = inte rn ally gene r ate dtime base interval
O
n
ce calculate
d , " η " d
ata
mu
st
be sam p le d a nd co rr ectly tr a nsfe r re d to t he
9- d igit cou nte r d is p lay .
4-5 .

I NPU T CI R CU IT
46 .

( R efe r to F ig ur e 4-1 and to sc hematic .) Sig n al "f" is a p plie d to t h e i npu t ci r c u its con sisting
of A2S2, A1Q15, a nd A1Q14 . In pu t switc hS2 r o u tes t he sig n al to eit
her
t h e 1 ΜΩ
Χ
1, Χ 10 p at h , o r
t he t he 50 Ω pat h . Q14 and Q15 b iases t h ese sig n al pat h s, allowi n g t he Bala nced I nput Amplifie
r
to
accept eit he rt he 50 Ω o r t h e 1 ΜΩ sig n al ( r efe
r
to t
he
sc h ematic fo
r d
etaile d b
iasi ng i n
fo
r matio n
a
nd corresponding
signal p at h selectio n ) . A2S2 ca n also select α 1 ΜΩ Χ 10 atte nu ato r consisti ng of
α1 :10 voltage divi de r n etwo rk .
T
h e50
Ω
sig n al p at h consists of :
The 1 ΜΩ Χ 1, Χ 10 p at h consists of :
SE CTIO N I V
T H
EO
R Y
O
F
O
P E R
ATIO
N
α .

0 .1 amp fuse Al F 1 (3 .5 V r msmaxim u m in p ut) .
M od el 5383 Α
T
h
eo
r yof
Ope
r atio n
b .

Clampi ng and limiti ng d io d es (A1CR 12 and CR 13 ; a nd A1C
R
8
t hru
CR
11) whic h limit t he
i npu t to 1
volt pea k -to-pea k .
α .

FE T's A1Q17, Q18, a nd E mitte r followe r A1Q16 .
b .

Α switc h able low p ass filte r consisti ng of A1 R 55 a nd C44
.
'Boa
rd
-mo
un
te
d switc h A1S2
("F I L T ER") switc h es t h is filte r i no r o u t .

s
M od el
5383 Α
T h eo ry of O pe r atio n
4-7 . B A L A N C E D I NPU T A MPL I F I ER
4-8 .

( R efe r to F ig ure 4-1 and sc h ematic
.) T h is ci r cu it pr ovi d es a ppr oximately 24 dB m of sig n al
gai n fo r t he Sc h mitt t
r
igge
r i npu t . In a d ditio n , t he bala n ced in pu t amplifie r u ses α fee db ac k
ci r c u it to ensu re t
h
at
t he do level of t he Sc hm itt T r igge r i n p u t r emains con sta
n t i n s p ite
of
i npu t
ci
r
cu
it
o
r tem pe r at ur e va r iatio n s . Dc offsets, t h at r es u lt
fr
om
t h ese va r iatio n s a r e se n se d by
fee db ac k co mp a r ato ι , A1 U 5 a nd co m pa
r
ed
wit h t h e level set by bala nce pote ntiomete r Α 11132 . Α
d iffe r e n ce r es u lts i n compe n sati ng
voltage dr ive to α d iffe r ential te r min al of A1 U 8 . T h is
com pe n sati n g voltage
ultimately dr ives t he o u t pu t of Α 1IJ6 i n α di r ection w h ic h nu
lls t
he o
r
iginal
offset voltage . Fo r example ; if, du e to tempe r at ur e o r ci r cu it va
r iatio n s, t h
e
i npu t d o level to t h e
Sc h mitt T r igge r becomes mo r ep ositive ; A1 U 5 se
n ses t he c h a n ge at its i npu t . The com p a r ato r
r espo nd s b y pr ovi d i ng α negative voltage
w h
ic
h is proportional to t h is p ositive offset . T h is
negative voltage dr
ives α d iffe r en tial terminal of A1 U 8 ; fo r ci n g its o u t pu t in α mo
r
ep ositive
d
i r ection . T h is positive inc r ease ca u ses t h e inve r ti ng ou t pu t ofA1 U 6togomore negative ;
nu lli ng
t he o r igi n al p ositive offset . T h is co n siste n t d o le v el en s ur es t h at α
si n e wave i n p u t to t he
Sc
h mitt
t r igge r (A1 U 2) pr o du ces α symmet r ical s qu a r e wave ou t pu t .
4-9 . ΤΒΟ ANDMAIN GAT E CI R C U
ITS
4-10 .

( R efe
r
to F
ig
ure
4-1 and sc hematic .) As α r es u lt of t he Sc h mitt t r igge r , signal 'If" is now an
EE C L s qu a
r
e wave t h at is
com p atible to t h e d igital co un te r ci r cu its . Th is s qu a r e wave is a pp lie d to
t h e M ai n
Gate ( p
a r t of Α 1 U1) . Th e M ai n Gate is e n able d by t he low
M
G Esig n al
w h
ic
h
is
de r ive d
f r o m t he Τ . Β . (Time B ase) ci r c u its . The wid t h of M G E , o r "t", is d ete
r
mi
n
ed by t
he
setti
n g
of t he
f r o n t p anel GAT E TIME switc h . T h e ΤΒΟ coun t d ow n ci r cu its
r
es po
nd
to t
he switc h i npu
t by
co un ti n gd ow n t he 10 MHz ΤΒΟ to pr ovi de α0 .1, 1 .0, or 10
seco nd M
G
("t") wi d t h ( r efe r to F ig-
ur e 4-5) . It is du ring t h is "t" i n terval, t
h
at t
he
ena
b le d M ai n Gate p asses sig n al "f" t hr oug h to t he
Deca
de
Co unte
rs
.
T hese co un te r s co un t t he nu mbe r of cycles (dur i ng i n terval "t") a nd pr ovi de
t he r es u lti n g "η"d ata i n t he fo r m of n ine (4 bit) B CD ch a r acte r s . Th is acc u m u late
dd
ata is
t r ansfe rr ed to
9
sto r age latc h es w he nα T R (t r a n sfe r ) pu lse is r eceive
d
f r om t he Sca n Timing
ci r cu its .
4-11 . SCA N TI M I N G CI R C U ITS
4-12 .

(
R efe
r
to F
ig
ur e
4-1 o r
sc
hematic .) A1 U 24, t h e Sca n Oscillator, is α n omi n al 2 kH z timi n g
sig n al gene r
ato
r . The 2 kH z o u tp u t dr ives t h e Scan Timi ng Ci
r
cu its w h ic hp r ovi de upd ate,
sam p le, a nd d isplay timi ng sig n als to t h e coun te r sto r age latc h es a
nd
t
h
e
d
is p lay
ci r
cu
its . F ig
ur
e
4-2 s h ows t he wavefo r ms associate d wit h t he Sca n Timi ng ci
r
cu
its .
4-13 .

T he upd ate sig n als a r eh el d off un til t h e meas ur i n g time
i n terval,
"t", e
nd s .
At t
h is time
M G goes h ig h enabli n g ge n e r ation of t h e
followi ng
sig
n
als : R STB
( R eset Ti m e
Base),
TR (T r a n sfe r
It
n"
d ata) a nd R SC ( R eset Co un te r s) .

Th ese sig n als a r e sy
n
c
hron
ous
wit h
t
he
2 kH
z
Sca
n
Oscillato r . R ST B occur s fi r st a nd r e m ai n s active dur i
ng
t heen ti
r e
up
d ate se qu ence . Typically t h is
se qu e nce lasts a ppr oximately 0 .4
milliseco n ds . During t h is b r ief time (i .e ., b r ief i n proportion to
t h e 0 .1, 1 .0, o r 10 seco nd
M
G
i nte r val) :
Ο

R
ST
B d isables t h e ΤΒΟ coun t d ow n ci r c u its ( h ol d i ng M G h ig h ) .
T he TR pu lse is ge ne r ate d , t r a n sfe rr i ng all n i ne "η " d ata B CD ch a
r
acte
rs
to t
he storage
latc h es . The storage latc h es a
r
e isolate d f
r
om t h e Deca
de co un
te
r s
at
all times, excep t
dur i ng T R pu lse time .
T h e R SC pu lse is ge
ne r
ate
d (afte r t h e TR p ulse te r mi n ates) to r eset all coun te r s to ze r o .
4-14 .

Afte r R
SC pu
lse time, t he R ST B sig n al c h a nges state, r eleasi ng the Τ . Β . countdown ci r cu its
so t hey can initiate anothe r
frequency
meas ur eme n t cycle . F ig ur e 4-3 (on p age 4-6) pr
ovi d
es
wavefo ι ms a nd α d etaile d ci r c u it d esc riptio n of t he display upd ate se qu ence .