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Sect ion III - Operatio n
a
nd
P
rogra mming
M
ode l 59313Α
(e)
W
ith
t
he test progr am runnin g, apply zero
v
olts to the analog inpu t j ac k
o
f the chann el be in g
tested . Using α
s
mall screwdrive r, turn th at c h a nnel's
f
r ont panel ZERO co ntrol un til the co ntroller displ ays zero .
NOTE :
F
or maximum accuracy, try to ce nter the co ntrol in
t
he ze ro reg ion.
(f)
Z
ero volts can be obta ined in severa l ways :
(1)
Th e two wires goin g to the analog input jack can be shorted together.
(2)
Th e phone plug ca n be pu lled out of
t
he analog inpu t jack and the rear p a ne l CA L sw itc h
moved to the "0" positio n.
(3)
Th e device co nn ected to the analog inpu t jack can have its outpu t go to zero ; for examp le,
if an electronic pr essure transdu ce r is in use, z ero pressure coul d be appli ed to its input. This met hod would a lso
take care of any
z
ero offset app ea ring on the
p
r essur e transducer outpu t or any offset result ing from thε 59313 Α
input bias current (100 ηΑ
m
ax) in teract ing w it h α high
o
utpu t impedance pressur e transd ucer, as (iBI AS Χ
ZO UT - VO FF SET)'
(g)
Th ere are three ways to adjust ga in . Th e first uses α p reci s i o n voltage so urce co nnected to the
anal og input jac k . Th is coul d be α vo ltage standard where the dials are simply set to the desi red vo l tage or co uld
be α variab le
p
ower supply with α good digital vo ltmeter connected to it to
m
onitor the vo ltage . Si mp ly set the
so urce to the desi red full scale vo ltage and, using α small screwdriver, turn the ch a nn el's
f
ron t pa n el GA IN co ntrol
for the channel un de r adj u stment until the co ntroller displ ays the desired full scale number.
M
ax imum resolu tion
is obtained with α fu ll scale of 1023, 1022
m
ay be more suita ble because it is possible to te ll if £υ 11 scale is
exceeded, and 1000 as α full scale may be more co n ve ni ent to thin k about, and also permi ts α slig h t over r ange
capability .
(h)
Α seco nd way to adjust ga in uses the dev ice co nn ected to the chann el as the ca li bratio n so urce. If,
for instance, α pr essure transdu ce r is in use, α manometer and pr essure source could be connected to the
tran sd u ce r a n d α fu ll scale press ure applied . Th e fro nt panel GA IN co ntrol is the n adj usted un til the co n troll er
displ ays th e full scale value previously se lected .
(i)
Th e thi rd way to adjust ga in uses the 59313Α in te rnal ca li bratio n vo ltage .
W
hen the phone plug is
r emoved
f
rom the analog inpu t jack
o
f the channel to be adjusted, the ca l ib rat ion voltage
i
s automat i cally
co nn ected . Th e r ear p an e l CA L sw itc h can
t
hen se lect -1 .00
v
olts or -5 .00 vo l ts . -I V
i
s used when α full scale
between 1 an d 5 vo lts is desi red and -5 V
i
s used for α full scale betwee n 5 and 10 volts . If the full scale desired is
exactly 1 or 5, th e corresponding vo ltage
i
s se lected and the
f
ront panel GAIN control turn ed until t h e controller
displ ays negative full scale.
F
or α full scale of other than 1 or 5 volts, the followi ng f ormul a gives the nu mb er the
co ntroller mu st disp lay when
t
he GAIN control is set correctly.
wh ere
Ν = OUTPUT Χ VC
V F
Ν = NUMBER DI SPLAYED ON CO NTR OLLER (CALCULATOR)
OUTPUT = DE SIRED 59313Α
F
ULL SCALE OU TP UT ( for exa mp le : 1023, 1022, or 1000)
VC = CA LIBRATION VOLT AG E US ED (for examp le : -1 or -5)
VF = DE SIRED FULL SCALE ANALOG INPUT VOLTAG E.
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