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RADIOMETER TCM3 - Page 24

RADIOMETER TCM3
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2.
TCM3
TCM3
and
TCM30
Service
Manual
Checkout
and
Adjustment,
Continued
Step
0:05
Step
0:06
Step
0:07
PO:
Channel
Step
0:09
Step
0:08
9-12
TCM3
monitors
from
RUN
22:
Step
Action
1.
Entire
display
is
lit
(“0:05”
is
not
shown
in
AUX
display).
2.
5.
Connect
12
VDC
(external
power
supply)
to
the
simulator
terminal
DC
INPUT.
Check
that
the
secondary
voltage
of
the
switching
transformer
is
8.20
+
0.15
V
(DVM+
to
TP7,
DVM-
to
TP4
on
the
Analog
PCB).
Disconnect
the
external
power
supply
from
the
simulator.
Connect
the
monitor
to
the
mains
by
means
of
the
Mains
Adapter.
Check
the
above
voltage
for
9.20
+
0.2
V.
Connect
DVM+
to
TP5
and
DVM-
to
TP4
on
the
Analog
PCB
and
check
that
the
voltage
is
5.000
+
0.003
V
(+5V).
Tf
outside,
adjust
R53
on
the
Main
PCB
for
5.000
+
0.001
V.
Connect
DVM+
to
TP
8
and
DVM-
to
TP
4
on
the
Main
PCB
and
check
that
the
voltage
is
5.00
+
0.1
V
(+
5V
RAM).
This
procedure
checks
the
polarisation
voltage
and
zero-point
for
the
pO,
channel.
Step
Action
1.
Check
that
the
polarisation
voltage
reading
in
the
pO2/pCO,
display
is
between
0.6
77.0
and
0.6
83.0
(—677.0
to
—683
mV).
2.
Connect
the
simulator
TEST
SOURCE
—680
mV
terminal
to
the
TEST
INPUT
pO,
terminal
and
check
that
the
pO,
display
shows
the
same
value
as
for
the
polarisation
voltage
+
0.5
mV
(Step
0:09).
In
step
0:10
the
display
shows
the
voltage applied
to
the
TEST
INPUT
pO,
terminal
minus
the
polarisation
voltage
obtained
in
step
0:09.
This
facility
is,
however,
not
used
in
the
checkout
and
adjustment
procedures.
Continued
on
next
page
199808-1

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