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Calibration
Procedures
Son/all®
Centrifuges25.
Repeat
step
19.
c and
d
as
required
to
get
the
proper
calibration.26.
For
fine
adjustments,
turn
potentiometer
R14
counterclockwise
to
increase
orclockwise
to
decrease.27.
When
proper
transfer
is
achieved,
set
timer
to
OFF.28.
With
rotor
at
rest,
set
timer
to
HOLD.29.
Press
START
switch.
Check
lapsed
time
Indicator
from
zero
rpm.30.
Set
to
transfer
point.NOTEThe
transfer
point
should
not
exceed
a
3-minute
duration.
If
the
transferexceeds
3
minutes,
the
rate
controller
P.C.
board
No.
50155
should
bechanged.31.
Set
main
power
switch
to
OFF.32.
Replace
silencer
in
proper
position
around
the
drive
motor.33.
Replace
all
side
and
rear
panels
removed.Table
7-2.
Test
Point
Description
forP.C.
Board.
PN
50059TP-l
CommonTP-1
-
TP-2
0
to
120-150
Vdc
Speed
Control
OutputTP-3
-
TP-4
0-11
Vdc
Zero
Speed
DetectorNOTEFloating
power
supply,
tachometer
signal
comes
in
and
must
floatbecause
of
operation
of
speed
control.
(Do
not
go
to
ground.)ORPM
0
Volts
above
100
RPM
11
VdcTP-4
Common
to
0
speed
detector
and
overspeed
detector.TP-5
To
monitor
tach
signal
when
and
if
test
rig
becomes
available.TP-6
With
scope
will
measure
0-5V
pulse
every
1.25
seconds.
Counts
forhold
mode.7-12
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