HP 435B - Operational Amplifiers

SERV IC E SHEE T 3 (Cont' d )
DC Amplifier and Servo Amplifier
M easur e t h e
do
inpu
t a nd o u t pu t v o l tages . V e rify t h at t h e
a
mpli-
fi e r ou t pu ts r es po nd
pro p e rly to t h e inpu ts . F o r t r oubl es h oot in g
o p e r at i o n a l a mpli fie r
s re fe r to Ge n e r a l Se rvi ce Info rm at i o n
in
Sect i o n VIII . Α
Se rvo Amplifi e r pr o bl e m will b e e vide n t only
du r in g t h e ze r o in g se
qu e n ce .
AutoZero Assembly
Th e
no
rm
a
l
va lu e r a n ge o f t h eo ff set e rr o r v o l tage at ΤΡΑ i
s abo u t
-14
to
+14 mVd c . Th e po w e r se n s in g de vi ce no rm a lly exhibi
ts α
s li g h t pos i t iv
e ou t pu t du e to a mbi e n t te mp e r at ur e, t h e r e f o r e, t h
e
no rm a l co rr ect i o nv
o
l
tage i s s li gh t ly n egat iv e, h e n ce -4 mVd c .
Th e v o l tage
meas ur e d at ΤΡΒ w ill pro vi de an indi cat i o n o f h
o w
l o n g t h e c h ar ge i s reta in e d
on
A
4
A
1C1 . Th e v o l tage s h ould
r e m a in vir t u a lly un c han ge d (±1
mVd c) f o r 24 ho urs .
If a ny co mp o n e n t on t h e Α 4 Α 1
asse mbly is f o und to be de f ect iv e,
t h e e n tir e assem bly mu st
be re pl ace d .
Switc h Assembly
and AC Ampl/Sync Detector
Ρ / Ο Α 1 andΡ
/
Ο Α 4
4

S ERV IC E SHEE T