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Model
DRC-93c
section V
of reset with time required being
selected then the heater will put
the shortest for higher settings.
0.33 amperes through the resistor
Next, turn the reset off and make
at
100
percent.
The -2 range will
sure that the reading returns to
output
0.10
amperes at full scale
0 . 0
volts.
output. At the
-3
range the output
will be 0.033 amperes full scale
5 . 5 . 7 . 3
Rate
-
The operation of the
and at the -4 range the output will
Rate can not be observed without
be
0.001
amperes
measuring voltages in the unit.
5 . 5 . 8 . 2
W60
W a t t
Option
-
If the
To check the
RATE
move the
DVM
HI
unit has a W60 output option the
lead to TP31, keep the GAIN at
10,
Max scale has a 1.55 amp, 40 volt
turn the RESET off
(0.0)
and enter
limit.
If a 25 ohm resistor is
a
RATE
to
99.
The
DVM
should read
used the controller will supply
60
0.0
volts.
Quickly change the set
watts to the load. If a 100 ohm
point
value
from
approximately
resistor
is
used on the M a x scale
equal to the display value to a
the unit will output
40
volts at
value
20%
higher
in
equivalent
0.4
amps
or 16 watts.
The lower
kelvin temperature, e.g. from 1.00
ranges are scaled as explained in
volts to
0.80
volts.
The
DVM
5.5.7.1
above except the voltage
should show a positive transient
limit
is
43 volts.
whose peak value will lie between
0.1
and 7 volts depending on the
NOTE: The values given above are
rate at which you change the set
nominal values. If they are slight-
point,
the amount of gain, the
ly off it should not effect opera-
speed at which you change the volt-
tion since the heater circuit is
age as well as when the reading is
read by the
DVM.
For the change
from
.80
to
1.00
the reading will
be negative in value.
5 . 6
CALIBRATION
The GAIN,
RATE
and RESET values are
The adjustments and test points
summed together before the heater
referred to in this section are la-
drive circuit with the GAIN being
beled on the instrument calibration
multiplied
by
two
in
signal
cover.
Remove the two top panel
strength before summation. The sum
screws and slide the top cover off
of the three terms can be measured
to gain access to the adjustments
at TP28 ANA OUT.
and test points.
5 . 5 . 8
Checking the
H e a t e r
Ranges
Note:
The unit should be allowed a
one-hour warm-up time to achieve
5 . 5 . 8 . 1
Standard
50
W a t t
output
-
rated specifications.
This Cali-
Set up the unit so that 100 percent
bration procedure is for a
DRC-93C
is
output to the heater load.
At
with standard diode
A
and B inputs.
full power out on the Max scale
1
For other configurations, refer to
amp should be through the resistor,
Section VII for the specific Input
as long as the resistor
is
50 ohms
or less.
The heater circuit has a
compliance voltage
limit
of
50
5 . 6 . 1
Input Card
Calibration
volts, so a resistor larger than 50
ohms will limit the current to
50
Calibrate each input card as speci-
divided by the load's Resistance.
fied in Section VII for that card.
If the next lower range (-1) is
COPYRIGHT 3/88
5-5
part of a feedback loop.
C a r d
present in the unit.
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