Du Pont SORVALL RC-5 Service Manual page 189

Calibration Procedures
Sorvall®
Centrifugesi.
Power
Supply,
Temperature
Control:
+5 V
(R7) and
+10 V
(R4)This
procedure adjusts
the
temperature
control
power supply
to +5
V
and
+10 V
outputvoltage.1.
Set the circuit breaker to
OFF.2.
Connect
the
dc voltmeter between
TP-1
(-) and
TP-7
(+).3.
Place the
system
in the
HOLD
mode.4.
Adjust potentiometer
R4 for +10
Vdc5.
Set the main circuit breaker to
OFF.6.
Connect
the
dc voltmeter between
TP-1
(-) and
TP-9
(+),
observing
proper
polarity
ofthe
test
leads.7.
Place the
system
in the HOLD
mode.8.
Adjust
potentiometer
R7 for +5 Vdc indication
on
the
voltmeter.9.
Set the main circuit breaker to
OFF.10.
Remove the
voltmeter.j.
Temperature Indicator
M102
Deflection Adjust
-20°CPotentiometer
(R41) and
+40°C
Potentiometer
(R40)This
procedure adjusts
M102
for zero and full scale
indications.1.
Set the circuit breaker to
OFF.2.
Place the centrifuge
system
in the
HOLD
mode.3.
Adjust potentiometer
R40
fully
counterclockwise.4.
Referring to
figure 7-2, place
the 106.15
ohm precision resistor
in the
circuit.5.
Adjust potentiometer
R41 for
a -20°C
indication. Remove
the
106.15 ohm
resistor.6.
Referring
to
figure 7-2, place
the 149.79
ohm
precision
resistor in the
circuit.7.
Adjust potentiometer
R40 for
a
+40°C
indication
.8.
Repeat steps
4
through
7 until
-20°C
and
+40°C
indications are
obtained.9.
Set the main circuit breaker to
OFF.10.
Remove the
precision
resistor and reconnect the original circuit as shown in
figure7-2.7-6