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M o d e l 8225
Analog Output
M o d e l DRC-91C/93C
If
re-calibration is needed, use t o
t h e
following
procedure.
T h e
following
equipment
is
used
t o
calibrate the
8225
Analog Output:
1
D i g i t a l
Voltmeter/Mult i m e t e r
(DVM)
-
4½
d i g i t
resolution o r
better.
2 . Set the
power
switch t o OFF and
disconnect the p o w e r cord from
2 .
Precision
Standard
Resistor t o
the unit.
Remove
the
three
top
simulate
the
input sensor or a
panel screws and
slide the
panel
Precision Voltage Source w i t h an
off.
Note on
the
calibration
output resolution of
100
u V out
cover
the
position of
Option
of
3 V
o r better.
Slot
1
o r
2
w h i c h
the 8225
w i l l
occupy
The
u n i t should be allowed one
hour
t o
warm
up
t o
achieve
rated
3,
Remove
the
four screws
that
specifications.
U s e
the following
secure
the calibration cover t o
procedure t o c a l i b r a t e the
8225
its c l i p s and remove the cover.
Analog output:
4.
Plug the
8225
printed c i r c u i t
1 .
Remove
the
three
top
panel
board
i n t o option S l o t
1
o r
2
s c r e w s and
slide the
panel off.
w i t h the component
side
t o
the
l e f t of the u n i t a s viewed
from
2.
Connect the DVM plus lead t o the
the front.
Thread the
two black
J3
MONITORS connector pin C and
and white w i r e s from the
8225
the
m i n u s
lead
t o pin D .
along the inside edge of
the
rear panel and solder
the white
3. W i t h
the
load
r e s i s t o r s , o r the
w i r e t o
MONITOR
connector
J3-
voltage standard,
t o
simulate
Pin
C
and black w i r e t o Pin D .
the
input sensor go t o a low
temperature
and
a d j u s t
t h e
5 .
Install
the
calibration cover by
trimpot
labeled Z
( f o r Zero) on
reversing procedure i n
3.
the calibration cover u n t i l the
voltmeter
reading corresponds
6.
I n s t a l l the top panel.
t o
10 mV/K.
G o
t o a high
temperature
and
a d j u s t
t h e
8225.5
OPERATION
trimpot labeled
S ( f o r Span)
T h e
o u t p u t
r e s o l u t i o n
and
4 . R e p e a t
procedure
in
paragraph
3
equivalence
is given
i n
Table
u n t i l there is no further Zero
8225-1.
For
a temperature
display
o r
Span
adjustment required.
of
100.00
K the
8225
would output
1.000
V.
T h e
output is rounded t o
5 .
Install
the
top panel.
the equivalent u n i t f o r the
1
mV
output.
A
display of
23.42
K would
r e s u l t i n an output of
0.234 V
and
8225-7 REPLACEABLE PARTS
a display of
23.47
K would result
i n an output of
0.235
V.
Included
in
this
Section is Figure
8225-1.
It includes the M o d e l 8225
A n a l o g
O u t p u t
s c h e m a t i c ,
8225.6
CALIBRATION
r e p l a c e a b l e
p a r t s
l i s t
and
i l l u s t r a t e d
component
l a y o u t .
The M o d e l 8225
has been calibrated
R e f e r
t o the manual f o r ordering
t o specification p r i o r t o shipment.
information.
8225-2
COPYRIGHT 12/87
LSCI
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