HP 435B Operating And Service Manual page 41

Ad
j
ustments
M o del 435 Β
A4R12, R16
A4R66
A4VR1, VR2
Ta
b
le 5-1 .
F
acto
r
y Selecte
d
Com
p
onents
B
asis ο( Selection
A3R5
i
s sel ected fo r α p ower reference output of 1
m
W
(into 50 Ω) if thi s value
i
s outs ide the ad
j
ustment
r
an ge
of LEVEL ADJ A3R4.
See Mul tivibrator Ad
j
u st m ent (paragr aph 5-7).
Α 41112
a
nd R 16 a r e selecte d for correct zero carryover
betwee n r anges . See Zero Carryover Test (par agraph
4-6)
f o r
t
h e limits
f
or each r ange.
A4R 66 i s se l ecte d for α full-scale
r
eadin g (100
m
W)
with an acc urate 10
m
W
input after compl eting
P
ow er
M eter Ad
j
u st ments with Calibr ato r (see par agr aph 5-
9). Hewlett-P ac k a rd reco mm e nds using α
M
odel
11683Α Calibr ator to ac hie ve the needed accur acy for
selecting t hi s
r
esistor . The DVM rea ding at the
P owe r
Mete r 's RECO RDER OUTPUT will be 1000 ±3 mVd c
with
t h e cor r ect
r
es istor in pl ace .
A4 VR 1 and VR2 are selected to achieve acc uracy on
the top two
r
anges whe n
t he acc urac y on othe r r a n ges
i
s within specifications . See Instrumentation
Accur ac y Test with Calibrator (p ar agraph 4-7)
f
or t h e
limits
f
or each range.
Service
S
h
eet
5
2