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9317C/9318C
Input
cards
Model
DRC-91C/93C
Since very often these values will
card.
Attach the plus and
not be available to the user of
minus leads of the DVM to the
this
instrument,
Lake
Shore
test
points marked
V+
and
Cryotronics,
Inc.
offers
a
re-
V - r e s p e c t i v e l y
o f
t h e
calibration service.
Contact a
9317C/9318C
FCB
and adjust the
factory representative for informa-
trimpot marked IZ so that the
tion
concerning
re-calibration.
voltage reads as close to zero
Note that the card believes that
as possible.
If this voltage
the correct resistance and voltage
is
not close to zero, it may
is
applied
during
calibration,
effect
the
sensor
current
therefore
the
accuracy
of
the
setting.
Consequently, this
calibration depends on the accuracy
operation should be performed
of the standards used.
before any current calibrations
are
performed.
Disable
CAL
7
and continue.
Note that
CAL
8
9317C/9318C.7
CALIBRATION
will
remain enabled for
all
calibration operations.
The 91C/93C should be allowed a one
hour warm-up time to achieve rated
4a. Voltage
Match
or Span
-
Connect
specifications.
References
are
the DVM plus and minus leads to
made in the calibration procedure
the
V+
and
V-Sensor
Output
to eight calibration switches,
CAL
Signal.
terminals
of
the
8
through
CAL
1 .
Refer to Table
MONITORS
connector
for
the
9317C/9318C-2
for
the
hardware
input being calibrated.
Apply
switch definitions of
CAL
8
through
a
+1
(9317C) or
+10
(9318C)
CAL
1 .
References are made to test
millivolt signal to the +V and
points, adjustments and calibration
-V
Sensor Input
terminals.
switches that are labeled on the
Enable
CAL
6
on the card
(CAL
8
calibration
cover.
Use
the
is still enabled).
The DVM
following procedure to calibrate
should read about 1 volt and
the 9317C/9318C Resistance Input
the display of the unit should
Card.
read approximately
10000.
Adjust the trimpot labeled A/D
1.
Remove
the
three
top
panel
so that the voltage read on the
screws and slide the panel off.
DVM matches the display of the
unit (if the
DVM
reads 1.0085
2 .
Configure
the
input
that
make the display read 10085.).
contains the 9317C/9318C as the
If the trimpot is adjusted wait
SAMPLE
input only and make the
a minimum of
10
readings before
units
Turn off Digital
disabling
CAL
6 .
Filtering
and
Thermal
Cor-
rection (DIP switches of the
4b. Apply
a
-1
(9317C) or
-10
appropriate SENSOR ID switches
(9318C) millivolt signal to the
2
and
3
to the OPEN
(OFF)
input and enable
CAL
5.
Do not
position for the DRC-91C
or
adjust any of the trimpots.
disable fram the front panel on
Disable
CAL
5
after approxi-
the DRC-93C).
mately 30 seconds.
When the
display goes to
0 .
the unit
3.
Current Source Zero
-
Connect
has completed determining the
the 10K (9317C) ohm precision
voltage
input
calibration
resistor across the +I and -I
constants and has stored them
pins of the Resistance Input
in the 9317C/9318C calibration
both CAL
8
and
CAL
7 of the
Card input connector and enable
EEPROM.
93
17C/93 18C-6
COPYRIGHT
12/87 LSCI
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