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9215
Capacitance
Input
card
DRC-91C/93C
value is converted to a serial data
The unit should be allowed a one
string and transferred to the main
hour warm-up time to achieve rated
microprocessor
using
optical
specifications.
To begin remove
isolation.
the three top panel
screws and
slide the panel off.
The procedure
A relay on the Card configures the
is
divided
into three parts as
sensor
voltage
as
negative
or
follows.
positive based on the temperature
coefficient sign selected by the
1 . Calibration
of
the A/D
Con-
user
(Section
9215.5).
That
verter.
voltage is buffered and transferred
to the rear panel MONITORS connec-
2 .
Zero
calibration.
tor for external monitoring as well
as
to the
main
board
control
3.
Span Calibration.
circuitry.
The zero and span calibration is
done with the instrument and system
9215.8
CALIBRATION
wiring configured as it will be
used.
This will provide optimum
The
9215
was calibrated to specifi-
accuracy because lead and
stray
cation prior to shipment. The card
capacitance will
be
taken
into
meets specification for operation
account.
either
in
the
9215-15
or
9215-150
configuration by
simply pressing
9 2 1 5 . 8 . 1
A/D Calibration
the switches located on the card.
This Section provides information
1 .
Locate DIP switch package SIA-
to permit recalibration if needed.
Switch
2.
Under normal opera-
tion this switch is CLOSED(1).
Change
this
switch
to
the
NOTE:
Calibration
for
zero
OPEN
(0)
position.
capacitance may be required to meet
accuracy
specifications
if
your
2. Connect the DVM plus lead to the
sensor lead capacitance or stray
+V
Buffered Sensor output Signal
capacitance is excessive.
pin for the appropriate Input
Card and the minus lead to the
-V pin on the MONITORS connec-
The following equipment is used to
tor.
Connect
the precision
calibrate
the
9215
Capacitance
voltage
source across the E
Input Card:
(+V) and D
(-V) pins of the
five pin input connector for the
1 .
Digital
Voltmeter/Multimeter
input
corresponding
to
the
3.
Set
the
standard
to
1.5000
10
nanofarad and
100
nanofarad
with
tolerance
of
±0.1%
or
4 .
Verify that the Display indi-
better.
cates
the
Capacitance
Input
3.
Precision
Voltage
Source
-
capable of supplying a voltage
5 . Adjust the trimpot marked
A/D
with an accuracy
and
resolution
until the display reads 15.000nF
of
100
microvolts out of
10
for the
9215-15
or
75.00nF
for
volts or better.
the 9215-150.
Check linearity
by inputting
2.0000
and
1.0000
92 15-6
COPYRIGHT 2/88 LSCI
(DVM)
-
4½ digit resolution or
Capacitance Card.
better.
2.
Precision Standard Capacitors
-
volts.
Card.
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