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9317C/9318C
Input Cards
M o d e l
DRC-91C/93C
When switch
3
of the SENSOR ID is
9317C/9318C.5.3 Operation as the
CLOSED (ON) the thermal correction
Sample
Input
is enabled.
When switch
3
is OPEN
(OFF) the thermal correction
is
W h e n
the input occupied by
the
disabled.
Pressing the
LOCAL
key
9317C/9318C
is
selected
as
the
for the appropriate channel will
Sample
Input
(Sample only
-not
display either ±18 C or ±17 C .
The
Control), the 9317C/9318C deter-
plus
(+)
that the control thermal
mines
the
sample
resistance by
correction is enabled.
The minus
forcing the voltage
across the
( - )
means
the
Control
thermal
sensor to 1.05
(9317C) or 10.5
correction is disabled.
(9318C) millivolts as quickly as
possible with the microprocessor
9317C/9318C.5.2
Thermal
Correction
controlled current source.
Once
Selection for the
DRC-93C
the forward current range and value
results
in
the desired voltage, the
W h e n
a 9317C or 9318C Resistance
current is reversed and the thermal
Input
Card
is installed, pressing
value determined.
As long as the
the SENSOR key will display either
voltage across the sensor does not
±9317C or ±9318C for the appro-
change more than
0.5%
of reading
_
priate channel.
The plus
(+)
means
from one reading to the next, the
the control thermal correction is
forward and reverse readings are
enabled.
The minus
(-)
means the
taken each t h e the input card is
control
thermal
correction
is
asked for an update (approximately
disabled.
once a second) and a new thermal
value
is
determined.
If
the
Enable
or
disable
the
control
voltage changes more than
0.5%
of
thermal correction from the front
reading, the card stops reversing
panel by using a combination of the
the current and uses the thermal
SENSOR,
SCAN
,
and
keys
value previously determined until
as follows:
1 . Press and hold the SENSOR
9317C/9318C.5.4
Operation as the
key.
Control
Input
2. While holding the SENSOR key,
When the input occupied by
the
press the SCAN
key.
9317C/9318C
is
selected
as
the
The
SENSOR
key
may
be
Control Input
(Control only, or
released.
Sample and Control) the operation
of the card changes.
Since the
3.
To change the sign (change
card
has to provide a signal across
the enabled/disabled status)
the sensor that will control the
of the upper display press
heater power as well as measure
the
key.
Similarly, to
resistance (or temperature), it can
change the sign of the lower
no longer force the sensor signal
display press the
key.
to
1.05
or
10.5
millivolts
immediately.
4.
Release the
or
key,
then the
SCAN
key.
W h e n
a set point is entered by the
user, the DRC-91C/93C
calculates
5 Press
the
SENSOR
key
to
its
equivalent
control
sensor
verify that the proper sign
resistance.
From this resistance
is selected.
and
the
calibration
constants
(current and
voltage)
for
the
9317C/9318C input card, the set
9317C/9318C-4
COPYRIGHT 12/87 LSCI
the sensor signal stabilizes.
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