Another option
is
a
custom cut PROM (DRC-Precision Option) which
corresponds to the calibration curve of the customer's DT-500 Series sensor.
A
combination of
a
calibration and custom cut PROM
will
increase display
accuracy to nearly
±.1
Kelvin over the calibrated range. Please note that
any sensor may be used with this option,
i.e.,
the customer
is
not
re-
stricted to the
DRC
Series sensors.
There
are
two programming options available; each
will
control the
set-point, the gain and
reset
as
well
as
output the displayed temperature
and sensor selected from the
SW-10A.
format while the
DRC8-IEEE
is
in the popular IEEE-488 format.
The
DRC8-BCD-I/O
is
in
a
parallel
BCD
The DRC-80 Series
is
designed around
a
3870 microprocessor and asso-
ciated support circuits. The
DRC
curve
is
stored in
a
PROM which can handle
up to 32 break points per curve. The data consists of
a
table of temperature
and voltage associated with each break point.
can generate the
DRC
curve to an accuracy of better than
0.1
Kelvin over the
entire temperature range
(4.0
-
400K). The
DRC
diodes match this curve to
±0.5K
at
Helium and Nitrogen temperatures and to
±1.0K
at
room temperature.
1.3
Major Assemblies Supplied
These straight line segments
The DRC-84C includes
as
standard equipment, in addition to the digital
thermometer-controller, the following:
A.
Operating and Servicing Manual
B.
Four five Pin Plugs for Temperature Sensor Cables
C.
One seven Pin Plug for Monitor of Sensor Output Voltage
and the
DRC8-L/A
option
Model DT-500 Series silicon diodes or platinum thermometers
are
not
supplied
as
part of the
DRC-84C
instrument.
Complete Specifications, Accessory Equipment and Customs Options
are
listed in the front of the Manual.
1.4 Ordering of Replacement or Additional Sensors
Two
different sensor configurations
are
available for use with the
Model
DRC-80
Series instruments. These
are
the DT-500-DRC and the DT-500CU-
DRC-36 sensors. Their description
is
included elsewhere in this manual.
All
sensor configurations
are
available if the diode
is
calibrated and
a
special
PROM
is
cut.
More than one
curve presently
exists
which can be used with the DRC-80
Series instruments.
If
additional sensors
are
ordered for use with your
instrument, you must be certain to order the correct curve
so
that your
-3-
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