HP 435B Service Manual

M od e l 435 Β
t
ϊ

REFEREN C
E :

Se rv ice Sh eet 5 .
AD JU ST MEN TS
5-6 . PO WER REFEREN C
E OSCI LL ATO R LEVEL AD JU ST
MEN T
DE SC RIPTI O
N :

Th e p o w er r e fe re n ce osc ill ator o u t pu
t i s f acto ry -a d j u sted to 1 mW ±0 .7% ο u s in g α
s pec i a l m eas ure m e n t s y ste m acc urate
to 0 .5% ο (t r acea bl e to t h e N at i o n a l Bur ea u of
Sta nd a rd s) a nd a ll o win g f o r α 0 .2% ο
tr an s fe r er ror . To e n s ur e m ax imum acc ur ac y in
r ead j u stin g t h e po w e r r efe re n ce osc ill ato
r , t h e f o ll o win g pr ocedure pr o vid es ste p - by -
ste p in st ru ct i o n s f or using s pec ifi e d H ewl ett-
P ack a rd in str um e n ts of kn ow n cap ab il -
i t y . If e quiv a l e n t i n st rum e n ts are u se d , s
i g n a l ac qui s i t i o n c ri ter i a m ay v a ry a nd
re f e re n ce s h o uld b e m ad e to t h e m a
nuf act ure r 's g ui de lin es f or o p e r atin g t h e
e quipm e n t .
ο Ο
P O WER
RE F
OUTPUT
ΝΟΤΕ
T h e P owe r M ete
r
m ay be
r et urn e d to t h e n ea r est HP off i ce to have
t he powe r r efe
r
e
n
ce
osc ill ato r c h ec k e da nd /o r a d j u ste d . R efe
r to
Sect i o n II, P AC
KAG I NG .
HP
435 Β
P
O
WER MET ER

P
O
WER ME T ER 1 v com p 1
Γ ------ = "1

L__
_ _ J
T
HERM ISTO R

Ι i V R F
M OUNT

L_ _J
EQ UIPMENT :

P owe r M ete r . . . . .
. . . . . . . . . . . . . . HP
432A
Th e rmi sto r M o
un t . . . . . . . . . . . . . . HP 478A-H75
Dig i ta l V o l t m
ete r (DVM) . . . . . . . HP 3455A
F igure 5-1
. P ower R eference Oscillator L evel Adjustment
Setup
Ad j ast m e n ts
PR OC EDURE :

1 .

Set up t h e DVM to
m eas ure res i sta n ce a nd co nn ect t h e
DVM b et w ee n t h e V
RF
co nn ecto r on t
h
e
r
ea
r pa n e l o f t h e 432 Α a nd pin 1 on t h e t
h e rmi sto r m o un t e nd of
t h e 432 Α inte
r
co
nn ect ca bl e .
2 .

R o und o
ff
t
h e DVM indi cat i o n to t w o d ec im a l pl aces a
nd record t hi s v a lu e as t h e
inte rna l
brid ge r es i sta n ce (R) 6f t h e 432 Α (a ppr o
xim ate ly 200 o hms) .
3 .

Co nn ect t
h
e
432 Α to t h e P o w e r M ete r as s h o wn in
Fi g ur e 5-1 .
4 .

Set t h e P o w e
r M ete r LINE sw i tc h to ON (in) a nd t h e
P
O
WER REF sw i tc h to O FF .
Th e n, w a i t t
hir t y minu tes f or t h e 432 Α t h e rmi sto r m o un
t to sta biliz e b efor e pr o-
cee din g to t
h
e
n
e
x t ste p .
5 . Set t h e 432
Α RAN G E sw i tc h to CO AR S E ZER O a
nd a d j u st t h e fr o n t- p an e l
CO AR S
E ZER O co n t ro l to obta in α ze r o m ete r indi cat
i
o
n .
5- 3

HP 435B Specifications

General

Brand	HP
Model	435B
Category	Measuring Instruments
Language	English