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Model
DRC-91C/93C
1 .
Press and hold the SENSOR key.
2 .
While holding the SENSOR key,
1 .
Place the thermocouple in a
press the SCAN
key.
You
reference
bath
of
known
may now release the SENSOR key.
temperature (liquid nitrogen,
ice, etc.
)
.
Allow the system
3.
To change the sign if in the
to stabilize to the Reference
upper Display press the
key
Temperature.
while still holding down the
SCAN
key.
Similarly, to
2 .
With the front panel of the
change the sign if
in
the lower
instrument,
select
the
Display press the
key while
thermocouple
input
and
the
still holding down the SCAN
desired temperature units.
key.
3a. On the DRC-91C enable Reference
4. Release the
key (or
key)
Junction
Compensation
by
and then the SCAN
key.
closing (1) switch
3
of the
appropriate SENSOR ID on the
You should press the SENSOR key to
rear of the instrument.
Hold
verify that the sign is as desired.
the LOCAL key
and
verify the
display as
+9305.
See Section
9 3 0 5 . 7 . 4
Selection
of
Reference
9305.7.2
.
Junction
Compensation
via
the
Computer
Interface
3b. On the DRC-93C enable Reference
Junction Compensation by using
To
select
or
prevent
Reference
the SENSOR,
SCAN
and
A,
Junction Compensation via the IEEE
or
keys.
The Display should
interface, use the AC1C2 and BC1C2
show
+9305
when the SENSOR key
comands described in the DRC-91C
is
pressed.
See
Section
(Section
4.8.5)
or DRC-93C (Section
9305.7.3.
4.8.9)
Instruction Manual.
The
Reference Junction Compensation bit
4. Adjust the Offset Adjustment
may be listed as Switch
3
or the
trimpot so that the Display
Thermal Correction bit (used on the
r e a d s
t h e
R e f e r e n c e
9318C card).
Turning on (1) that
Temperature.
position turns on the compensation.
Note
:
The
Offset
Adjustment
9305.7.5
Rear
Panel
Offset
compensates for the thermocouple
Adjustment
used
in
the
calibration.
If
another thermocouple is attached,
W h e n
a
n e w
o r
different
or the thermocouple has aged, or
thermocouple is attached to the
the configuration of the system is
instrument
it
is
desireable to
changed, then the Offset Adjustment
permit the addition of an offset to
compensate for discrepancies
in
the
thermocouple material, leads and
9 3 0 5 . 7 . 6
Curve
Data
Format
connections.
An
Offset Adjustment
trimpot is provided next to the
The
9305
Thermocouple Input Card
Terminal Block on the Back Panel to
will operate with a user defined
allow
quick
calibration
of
the
curve
as well
as
the Internal
thermocouple without removal of the
Curves
listed
in
Table
9305-4.
instrument cover.
Temperature is calculated by linear
interpolation between curve points.
9305
Thermocouple Input
C a r d
The procedure is as follows.
must be repeated.
COPYRIGHT 6/88 LSCI
9305-7
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