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Section V
a. Check the Sensor Curve Table
(Table 3-2 or below) to deter-
mine
the
curve
number
that
selects the standard curve or
precision option that is needed.
A
9215
card
will not read temp-
erature.
The 9317C/9318C will
not
read accurately
in temp-
erature unless a precision
option is present.
Section 3-9.
b. Select the curve as described in
Model
DRC-93C
5 . 5 . 5
Temperature
Display
5 . 5 . 5 . 1
Determine
Input--The
first step to check the instru-
ment's display and operation is to
determine the type of sensor input.
a. The type of input option
card(s)
installed
in
the
DRC-93C
is
located on the front page of
every DRC-93C manual.
b. The DRC-93C displays the type of
input card(s) installed in the
A
and B inputs sequentially when
the instrument is powered on.
Possibilities are 9210-3, 9210-
R1, 9305, 9317C or 9318C.
c. The type of input can also be
displayed by holding down the
SENSOR key.
5.5.5.2
check
units
display-
Verify that the
A
units can be
5 . 5 . 5 . 5
Check
I n p u t
B
-
Change the
changed by holding in the UNITS key
connector from J1 INPUT
A
to J2
and using the
or the
to
INPUT B .
Repeat the above process
scroll through the sequence K, C,
by verifying the current source and
F, V, K, etc.
(Note: the unit goes
the
A/D
settings for this input as
to V
for a diode configuration
well as the units change.
9210-3, -6 or 9220-3, -6) or
for
a
resistance
card
configuration
5 . 5 . 6
Heater
O u t p u t
Test
(9220-P2, -P3, -R1 or 9317C/ 9318C
Input card).
5 . 5 . 6 . 1
H e a t e r
Output
Conditions-
The heater should output power when
5 . 5 . 5 . 3
check
sensor
u n i t s reading
the setpoint temperature is above
Next, check to see if the instru-
the display temperature, as long as
ment is reading the correct sensor
the heater is on and a gain value
units (volts, ohms or nanofarads)
has been entered.
If the sensor is
value
for
the
appropriate test
a diode, the voltage across the
resistor or capacitor from Table
device will change inversely with
5.1.
The reading should match the
temperature.
Therefore the higher
value given
in
the Display
in
Sen-
the voltage the lower the tempera-
sor Units column of Table 5-1.
The
ture.
For Platinum sensors the
allowable error is provided in the
resistance increases as the temper-
Input
A/D
Accuracy column.
ature increases.
Germanium and
carbon glass sensors are negative
5 . 5 . 5 . 4
Check
temperature reading-
temperature coefficient resistance
Confirm that the temperature in
sensors which vary several orders
kelvin displayed corresponds to the
of magnitude
in resistance with
selected curve number.
temperature.
6, 9215-30, 9215-150, 9220-3,
9220-6, 9220-P2, 9220-P3, 9220-
COPYRIGHT
3/88
5-3
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