RADIOMETER TCM3 - Page 27

TCM3 and TCM30 Service Manual
2. TCM3
Checkout
and
Adjustment,
Continued
Analog
Outputs
For
checking
the
analog
outputs,
the
procedure
to
be
used
depends
on
the
serial
number
of
the
monitor.
For
both
procedures
the
following
apply:
The procedures require the cabinet to be opened.
Connect
the
monitor
to
the
mains
via
the
Mains
Adapter.
Set
the
Simulator
OUTPUT
switch
to
ANALOG.
Allow
in
each
step
the
analog
output
to
stabilise
(approximately
30
seconds)
before
reading
the
DVM.
TCM3 below RUN 22:
Step Action
Step 0:16 1.
2.
Step 0:17 3.
4.
Step 0:18 5.
pO, zero-point, 0% modulation.
Connect
DVM
to
simulator
pO.
ANALOG
OUTPUT
and
DVM-
to
COM.
Check
that
the
output
is
—107.5
+
3.0
mV.
If
outside,
adjust
R84
on
the
Power
Supply
PCB
to
—107.5
+
1.0
mV.
pCO,
zero-point,
0%
modulation.
Connect
DVM+
to
simulator
pCO,
ANALOG
OUTPUT,
and
DVM—
to
COM.
Check
that
the
output
is
—107.5
+
3.0
mV.
If
outside,
adjust
R86
on
the
Power
Supply
PCB
to
—107.5
+
1.0
mV.
pO,
gain,
40.23%
modulation
Connect
D'VM+
to
simulator
pO
ANALOG
OUTPUT,
and
DVM-
to
COM.
Check
that
the
output
is
+1000.0
+
3
mV.
Tf
outside,
adjust
R83
on
the
Power
Supply
PCB
to
1000.0
+
1.0
mV.
pCO,
gain,
40,23%
modulation.
Connect
DVM+
to
simulator
pCO,
ANALOG
OUTPUT,
and
DVM~
to
COM.
Check
that
the
output
is
+1000.0
+
3.0
mV.
If
outside,
adjust
R85
on
the
Power
Supply
PCB
to
1000.0
+ 1.0
mV.
pO+/pCO,
zero
output,
3.91%
modulation.
Check
that
the
two
simulator
ANALOG
OUTPUTs
are
0.0
+
5.0
mV.
199808-1
Continued on next page
2-21