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Model
DRC-93C
Section
I
The control set point is also
changing the setting.
displayed on the front panel and
can be set from the front panel.
The maximum power can also be
The set point automatically takes
limited by using the rheostat on
on the units selected for the
the rear panel.
Power can be
control sensor.
In the units mode
reduced on the
MAX
scale to any
the set point can be set to five
value between
MAX
and a reduction
digits with the range of defined by
the control sensor input card. The
standard set point temperature can
When
greater
output
power
is
be
set to
0 . 1
degree.
This
required, the optional W60 output
temperature is converted to an
stage can provide
60
watts into a
equivalent voltage with a resolu-
25 o h m
load.
tion of
100
microvolts out of
3
volts full scale.
The optional
An IEEE-488 interface is standard
High Resolution Set point expands
in the DRC-93C. This interface can
the set point resolution to
0.01
be used to remotely control all
degrees
100
and
0.001
degrees below
front-panel functions.
When two
100.
The equivalent voltage is
input cards are used, data from
expanded to
25
microvolts out of
3
both inputs i s available via the
volts full scale.
This results in
interface.
a settability of approximately
0.01
kelvin above 40K and
0 . 0 0 1
kelvin
1 . 3
SPECIFICATIONS
below 28K for the DT-470 series
sensors.
Instrument
specifications
are
listed
in
Table
1 . 1 .
These
The control section of the DRC-93C
specifications are the performance
provides
three-term temperature
standards or limits against which
control.
Proportional
(GAIN),
the instrument is tested.
integral
(RESET) and
derivative
(RATE) are individually set with a
1 . 4 OPTIONS
range from
0 . 1
to
99
resulting in a
990
to
1
range.
The
options
for
the
DRC-93C
Controller are listed in Section
Heater power output of the DRC-93C
VII.
Temperature Controller is a maximum
of
50
watts when a
50
ohm heater is
Three option ports are designed
used.
A
digital bar graph on the
into the DRC-93C.
The options are
front panel displays the output as
field installable by the user.
a
percentage
of
output
range
selected.
Thus, the user can con-
822x-series options can be factory
veniently monitor power applied to
installed in the DRC-93C or field-
his system. To accommodate systems
installed at a later the.
The
which require lower heater power,
8223
RS-232C
Interface
Option
the maximum
output can be
at-
operates similar to the IEEE-488
tenuated in four steps of a decade
interface.
With the display in
each.
Three resistance ranges are
temperature units, the Model 8225
available; 0-25, 25-35 and
35-50
Analog Output option is available
Ohms.
to provide a
linearized analog
output of 10mV/K independent of the
The desired range is selected by a
display temperature units chosen.
slide switch on the rear panel.
If the display i s in sensor units,
The power must be off for this
the output for diodes is lV/V; for
selection, since the transformer
100
o h m
platinum, 10mV/ohm; for
output is shorted momentarily by
1000
ohm platinum, lmV/ohm; for
of a factor of ten in power.
COPYRIGHT
3/88
LSCI
1-3
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