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Model
DRC-91C/93C
9215 Capacitance
Input
card
9 2 1 5 CAPACITANCE I N P U T C A R D O P T I O N
9215.1
INTRODUCTION
This section contains information
pertaining
to
the
Model
9215-
15/9215-150 Capacitance Input Card
Configurations
.
Specifications,
installation and operating instruc-
tions,
a
description
of
the
principle
of
operation,
and
maintenance
information
are
included.
Section 9215.3 describes
some characteristics of Capacitance
sensors.
9215.2
DESCRIPTION
AND
SPECIFI-
CATIONS
The Model
9215
Capacitance Input
Card
is designed to
be installed in
a DRC-91C or DRC-93C to convert
either
Input
A
or
Input
B
to
accommodate
Capacitance
sensors.
when
used to control temperature in
magnetic
fields
the
capacitance
sensor is superior to other sensors
since the displacement current
in
a
capacitor
is
magnetic
field
independent.
Accurate temperature
reading requires the use of another
type of sensor
in
zero magnetic
field. This accurate sensor can be
placed
in
the other Input Slot of
the DRC-91C/DRC-93C.
The 9215-15 configuration is used
with capacitance sensors with a
maximum
of
30
nanofarads
(for
example, Lake Shore CS-401 Series
Sensors).
The
9215-150
configuration
will
accomodate Capacitance sensors of
up to
150
nanofarads (for example,
Lake Shore CS-501 Series).
The
card
can be configured by the
user as either a 15 nanofard (9215-
15) or
a
150 nanofarad (9215-150)
card
by switches on the card.
Specifications for the Model 9215
COPYRIGHT
2 / 8 8 LSCI
Capacitance Input Card Conf igura-
tions are given in Table 9215-1.
Table 9215-1.
specifications of
the
Capacitance
Input
Card
Display Resolution:
5 digits.
Display
Units:
Capacitance in
nanofarads.
Temperature Accuracy:
A function of sensor sensitiv-
ity.
See Table 9215-2.
Unit
supports capacitance only.
Sign of Temperature Coefficient:
User Selectable by Switch on
on DRC-91C, Keys on DRC-93C
or via Computer Interface.
Magnetic Field Sensitivity:
<
±0.15%
for B < 19 Tesla and
T > 4.2K.
See Section 9215.3.
9215-15:
Sensor Excitation:
5
kilohertz
charging current.
Capacitance Range:
Sensor
(ordered
separately)
:
CS-401
Series from
LSCI
or
or other Capacitance Sensor.
Resolution:
0.001
nF
Accuracy:
±0.25% of Full Scale
Range: 0.000 to
29.999 nF
Analog
Output signal:
0.1
times
0
to 15 nF,
0-30 nF with reduced accuracy
capacitance
(nF)
in volts
9215-150 :
Sensor Excitation:
1
kilohertz
charging current.
Capacitance Range:
Sensor
(ordered
separately):
CS-501
Series from LSCI or
other Capacitance Sensor.
Resolution:
0.01
nF
Accuracy:
±0.25% of Full Scale
Range:
0.00
to 149.99
nF
Analog Output signal:0.02
times
0
to 150 nF
capacitance (nF) in volts.
9215-1
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