Keithley 153, Инструкция по эксплуатации, Страница: 31 / 51

MODEL 1 5 3 MI CROVOLT -AMMETER
CALIBRAT ION
S E CT I O N 6 . C A L I B R AT IO N
6- 1 .
GENERA L .
a . T h e
f o l l ow i ng
p r o c e d u r e s are re c ommend e d f o r c a l ib ra t i ng
t h e
Mod e l 1 5 3 . Us e
t h e
eq u i p me n t r e c ommend e d i n Tab l e
2 . I f
p r o p e r fa c i l i t i e s a re n o t ava i lab l e or i f
d i f f i c u l t y
i s e nc oun t ered , c on t a c t
Ke i t h l ey Ins t rument s ,
Inc . ,
o r i t s r e p re s en t a t i v e
t o
a rrang e
f o r
f a c t ory c a l ib ra t i on .
b . The
f o l l owing
p r o c e d ur e s
a r e c overed :
me t e r and a t t enua t o r
ad j us tment s ,
o p e n c i r ­
cu i t
z e r o ad j us tmen t , ver i f i c a t i o n o f vo l t a g e an d curr en t rang e c a l ib ra t i o n s , r i s e t ime a n d
d r i f t ver i f i cat ions , and input impedance check.
c .
I f t h e Mod e l
1 5 3
i s n o t w
i
t
h
i n s p e c i f i c a t i ons
a f t e r
the c a l ib ra t i on , f o l l ow t h e
t roub l e s hoo t ing p ro c edure s
or
c o n ta c t Ke i t h l e y
I ns t rumen t s ,
Inc . ,
or i t s r e p r e s e n t a t i v e .
6- 2 . CALIBRAT ION
S CHEDULE . C a
l
i b r a
t
e t h e Mod e l 1 5 3 yea r l y . T h i s norma l l y me a n s p e r f o r ­
m i ng th e b ia s ad j u s tmen t ( pa rag raph 5 - 5 ) , me t e r ad j u s tmen t ( parag raph 6- 3 ) , a t t enua t o r
ad j u s tment ( p a ragrap h 6- 4 ) ) and open- c i r cu i t z ero ad j u s tment ( paragraph
6- 5) .
The o ther
v e r i fica t i ons n ee d be d on e only
i f des i r ed .
6- 3 ,
METER
ADJUSTME NT .
a . Af t er a 3D -minu t e
warm- up ,
c h e c k t h e Mod e l 1 5 3 f o r
z
e r o r e a d i ng o n the
I - vo l t
rang e .
I f
ne c e s s ary ,
ad just
t h e BIAS ADJ Po t en t i ome t e r , Rl 2 5 ( F ig u r e
20 ) .
S e e p a ragraph
5- 5 ,
b , Connect t he Mod e l
260
Nanovo l t
Source t o the Mod e l 1 5 3
INPUT Recep t a c l e , S e t t h e
contro l s
a s fo l lows :
Con t r o l
B ias ad j u s t
A t t e nua t o r ad j u s t
Open
Circu i t
Z e r o
Me ter
Calibration
Cen t er Zero
a
dj u s t
Mu l t i-vibrator
freq uency
METER Switch
FITNr.'T'TnN �tJi r rh
RANGE Switch
a d j u s t
Circuit
Des ig .
Rl 25
Rl
3 7
Rl 60
R1 7 6
Rl 7 7
R2 10
+
INPUT
R- 2M
I VOLT
F ig ,
Ref .
20
20
20
20
20
27
Ref e r
to
Paragraph
5-5
6- 4
6- 5
6-3
6- 3
5- 6
TABLE
6 .
Mod e l
1 5 3 I
n t
e
r n
al
Contr o l s , The Tab l e
lis t s a l l
i
n
t
e
r
n
a
l
contro ls ,
the
f igu r e p i c tu r ing the l ocat ion
and
t h e paragraph d e s crib ing the ad j us tment .
23