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Section V
Model
DRC-93C
5.5.6.2
Test
Setup
-
T e s t the
heat-
5 . 5 . 7 . 1 .
Gain
-
Enter a gain value.
er by placing an appropriate test
The
heater display should now indi-
r e s i s t o r
(see
T a b l e
1)
i n t o the
cate that power is being delivered
control sensor input, and place a
t o the heater.
T h e
amount of power
1 0
o h m
( a t least
1 0
watts) up t o
50
is a scaled f a c t o r of the e r r o r
o h m ( a t least
50
watts) r e s i s t o r
signal
times
the
gain
(
[Sensor
across
the heater
terminals.
v o l t a g e
-
Setpoint
voltage]
*
Gain).
I f
the
setpoint temperature
5.5.6.3.
The
Heater Display
-
The
is increased o r the gain is in-
heater display is shipped from the
creased the output power w i l l in-
factory
reading
the
percent
of
crease.
power out.
I f the heater
is
1 0
ohms then a t
100
percent output
Keep the LO lead of the
DVM
a t
TP1
current, the heater w i l l have
1
amp
and move the
H I lead
t o
TP29.
Turn
through it and
1 0
v o l t s across it.
off
the
G A I N ,
RATE and
RESET
by
I f
the
heater bar graph is reading
entering a value of
0.0
f o r each.
50%
then the instrument
is
deliver-
T h e DVM
w i l l now read approximately
ing
5
w a t t s
(0.707
amps and
7.07
0.0
v o l t s .
Change
the
GAIN
t o
1.0
v o l t s ) t o the
1 0
ohm
load. I f
the
and
the
DVM
w i l l read approximately
u n i t is reading i n current a
read-
0.1
v o l t s
which
is the e r r o r
O f
ing of
50
w i l l mean
2.5
w a t t s
(0.5
0.01
times
the
gain of
10.
Change
amps and
5
v o l t s ) .
The
heater
dis-
the
GAIN
t o
1 0
and the
DVM
w i l l
play can
be
changed from power t o
read approximately 1 v o l t .
Setting
current by switching internal d i p
the
GAIN
t o
99
w i l l r e s u l t i n a
s w i t c h
S4-1.
reading
of
approximately
7.2
v o l t s .
5.5.7
Checking
Gain,
R e s e t
and Rate
5.5.7.2
Reset
-
Set
up
the
con-
t r o l l e r
as
instructed
i n
s t e p
Check
the
operation of the
Gain,
5.5.6.1.
Enter a gain and setpoint
Rate
and
R e s e t
as follows:
value
that
r e s u l t s
i n less than
f u l l power t o
the
load.
I f
a
R e s e t
1.
Place
a dummy load
i n t o the
value is now entered, the instru-
selected sensor input.
ment w i l l t r y t o integrate out the
a.
5 0 K
t o
100K
f o r a
diode.
error.
W i t h
a test r e s i s t o r i n the
b.
Short
V+
t o
V-
f o r
9317C
o r
control sensor input and a fixed
9318C
Input
Card.
setpoint, the e r r o r signal w i l l
be
c.
10nF
capacitor f o r
9215
Input
constant.
W i t h
a constant e r r o r
Card.
the
R e s e t
w i l l continue t o increase
the analog output control signal
2.
Place a
10
ohm,
10
w a t t
(or
u n t i l the heater display reads
100
greater) resistance load on the
percent.
If
the heater
output in-
heater terminals.
creases t o approximately
100
per-
cent f o r these conditions
the reset
Units,
i.e.,
v o l t s ,
ohms
o r
nanofarads.
To
check
the
RESET
c i r c u i t i n more
a.
I f 9210-3/20-3
e n t e r a v o l t
d e t a i l
use the same set point and a
age
0.01
v o l t s less than
the
GAIN
of
10.
Move the
H I
lead
of
display.
the DVM
t o
TP30
and e n t e r a
RESET
b. I f 9317C
o r
9318C,
e n t e r a
of
1.0.
The
reading on the
DVM
resistance of
1
ohm f o r the
should gradually i n t e g r a t e t o ap-
set point.
proximately
7.2
v o l t s .
T h e
time
c.
I f 9215
e n t e r
11nF
set point.
required w i l l depend on
the
amount
5-4
COPYRIGHT 3/88 LSCI
3.
S e t
the Display Units t o Sensor
c i r c u i t is operating.
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