HP 435B - Est; Z Ero Carryover Test Set up

P e rf o rm a n ce T ests

M od e l 435 Β
4-6 . Z ER OCA RR YO VER T E ST
S PE C IFI C ATI ON : ±0 .5% ο o f full sca l e wh e n
z
e
r
oe
d in t h e m ost se n s i t iv e r an ge .
DE SC RIPTI O N :

Af te r t h e P owe
r M ete r i s ini t i a lly ze r oe d , t h e c h a n ge in t h e m ete r r ea din g
i
s monitored
at t
h
e RE
CO RDERO UTPUT as t h e in st rum e n t i s ste pp e d t hr o u g
h i
ts
r
a
n ges . Th e
m ete
r r
ea
din gs ta k e in to acco un t n o i se a nd drif t b eca u se z e ro ca
rry
ov e
r
a
nd t h
e
n o i se
drif t r ea
din
gs ca
nn ot b e se p a r ate d . R e fe r to T a bl e 5-1 if t h e r es ul ts are
n
ot wi t
hin
t
h e
limi ts .
EQ UIPMENT :

Dig i
ta
l
V
o l t m ete r . . . . . . . . . . . . . . HP 3455A
Po w e r Se n so r

. .
. . . . . . . . . . . . . . . . HP 8481 Α / Η or 8482
Α
/
Η
PR OC EDURE

1 . Set t h e DVM RAN GE co n t ro l to 100
mVd c .
4-4
R AN G E
Switc h
P os i tio n
fully εεω
1 ste p εω
2 ste p s εω
3 ste p s cw
4 ste p s εω
2 .

Set t h e P o w e r M ete r Swi tc
h
es as
f o ll o w s :
C ALFA CTO R . . . . . . . . . . . . .
100% ο
RAN G Ep os i t i o n . . . . .
. . . . . . fully cc w
PO WER REF ( r ea
r p
a
n
e
l)
. . .
O FF
3 .

Co nn ect t h e e quipm e n t s h ow
n in Fi g ur e 4-2 .
4 .

Pr ess t h e fr o
n t p a n e l ZER O sw i tc h a nd
w a i t f o r t h e m ete r indi cato
r 's pos i t i o n to
sta biliz e . V e
rify t h at t h e DVM r ea d s 0 ±0 .9
mVd c . R e l ease t
h
e
ZER O s wi tc h .
5 .

V e rify t
h at t h e RE CO RDER O
UTPUT f a ll s wi t hin t h e limi ts
s h o wn on t h eta bl e
f or eac
h r a n ge . R ecord t h e r ea din
gs .
Min . Ι
Actual
Ι
Μαχ .
mVd c
-15
-17
-14
-11
-8
m V d c
PERF O
RM A N
C
E TESTS

r°η
ΗΡ 435 Β
P O WER ME T ER
mVd c
+15

5
ste p
s
cw
+17

6
ste p s cw
+14

7 ste p
s cw
+11

8
ste p s εω
+8

fully c w
RE
CO
R D ER O U T PU T
(RE AR
P A NEL)
Fig u re 4-2 . Zero Carryover Test Set up
DIGITA L V O L
T ME T ER
I NPU T