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9305
Thermocouple
Input
card
M o d e l DRC-91C/93C
Voltage Span) until the output
+V and -V Thermocouple Input
on the DVM
is
-2.000
volts
terminals by
shorting across
±0.0001
volt.
the Terminal Block with a
short
jumper wire.
9 3 0 5 . 9 . 3
Thermocouple
and Secondary
Sensor A/D Calibration
2 .
Select
the
controller
to
display
the
9305
card
in
The
Thermocouple
and
Secondary
temperature units.
Sensor A/D converters have an auto-
zero function which means that the
3 .
Enable the Reference Junction
only calibration required is for
Compensation as described in
the
relative
gain
(span).
The
Section
9305.6.
The reading on
procedure is as follows.
the display should read Room
1 .
Make sure the instrument is
setup as described in parts
1.,
4.
Disable the Reference Junction
2a.
(or 2b.)
and 3.
in the
Compensation and the display
previous
section
(Control
should
read
Zero
degrees
Amplifier Calibration).
Celcius
(the
normalization
Apply a
+10
millivolt signal to
the
+V
and
-V
Thermocouple
9 3 0 5 . 9 . 4
Calibration Completion
Input terminals on the Terminal
Block.
1 .
Close
(1) S1.1
to return the
9305
to normal Secondary Sensor
10
millivolts.
Adjust
the
t r i m p o t
l a b e l e d
A / D
2 .
Remove anything that may be
(Thermocouple A/D Span) so that
shorting the two halves of the
the voltage read on the Display
terminal block.
is
10.000
millivolts.
3.
Verify that thermal correction
This test is to verify that the
A/D converter is symmetrical.
Apply a
-10
millivolt signal to
4 .
Slide the top cover onto the
the
+V
and
-V
Thermocouple
instrument
and
replace
the
Input
terminals.
The
DVM
three screws.
should
read
+2.0000
±0.0006
volt.
The Display should read
-10.000
±0.003.
If it does not
9305.10
OPTION
COMPATIBILITY
meet these specifications, the
unit should be returned to the
The special nature of thermocouple
factory for calibration.
sensors
and
their
connections
limits
compatibility with
Lake
9 3 0 5 . 9 . 4
Reference
Junction
Test
Shore
options
and
accessories.
Thermocouples must
be
attached
This test is to verify that the
directly to a terminal block.
The
Reference
Junction
Compensation
8229
Scanner Input Option and
8085
circuitry is operating properly.
External Sensor Scanner are not
If this test does not produce the
adapted with terminal blocks so
following results please consult
they can not be used with the
9305
the factory.
Thermocouple
Card.
The
8225
Linerized Analog Output Option will
1 .
Apply a zero volt signal to the
function in temperature units only
9305-10
COPYRIGHT 6/88 LSCI
Temperature.
point of the curves).
2 .
3.
The Display should read about
update operation.
4.
is properly selected.
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