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Sharp R-8R51 - Page 16

Sharp R-8R51
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R-
SR51(W).
R-8R51(B)
PROCEDURE
LETTER
‘-MAGNETRON
TEST
©
TEST
PROCEDURES
COMPONENT
TEST
-NEVER-TO
UEHOANY-PARTIN-THE-CIRCUT_WITE-YOUR-HAND-ORAN-INSULATED——_
TOOL
WHILE
THE
OVEN
IS
IN
rena
CAR
RY
O
UT3DCH
ECKS
lsolate
the
meaner!
from
the
nigh
valtage:
circuit
mee
PeInoving
al
sence:
connected!
to
the
filament
_terminal--.—
=
fe
es
To
test
for
an
open
circuite
filament
use
an
ohmmeter
to
make
a
continuity
test
between
ane
magnetron
filament
terminals,
the
meter
should
show.
a
reading
of
less
than
1
ohm.
To
test
for
a
short
circuit
filament
to
anode
condition,
connect
ohmmeter
between
one
of
the
fil-
ament
terminals.and
the
case
of
the
magnetron
(ground).
This
test
should
be
indicated
an
inifinite
resistance.
If
a
low
or
zero
resistance
reading
is
obtained
then
the
magnetron
should
be
replaced.
MICROWAVE
OUTPUT
POWER
BY
WAY
OF
IEC
705
The
following
test
procedure
should
be
carried
out
with
the
microwave
oven
in
a
fully
assembled
condition
(outer
casefitted).
Microwave
output
power
from
the
magnetron
can
be
measured
by
way
of
IEC
705,
i.e.
it
can
be
measured
by
using
water
load
how
much
it
can
be
absorbed
by
the
water
load.
To
measure
the
microwave
output
power
in
the
microwave
oven,
the
relation
of
calorie
and
watt
is
used.
When
P(W)
heating
works
for
t(second),
approximately
P
x
t/4.187
calorie
is
generated.
On
the
other
hand,
if
the
temperature
of
the
water
with
V(ml)
rises
AT
(°C)
during
this
microwave
heating
period,
the
calorie
of
the
water
is
V
x
AT.
The
formular
its
as
follows;
Pxt/4187
=Vx
AT
P
(W)
=
4.187
xVx
AT/t
Our
condition
for
the
water
load
is
as
follows:
Room
temperature
...
around
20°C,
Power
supply
Voltage
...
220
—
230
volts.
Water
load
...
1000
ml,
initial
temperature
...
10+2°C,
Heating
time
....
49sec.
P
=
85x
AT
Measuring
condition:
1.
Container
The
water
container
must
be
a
cylindrical
borosilicate
glass
vessel
having
a
maximum
material
thickness
of
3
mm
and
an
outside
diameter
of
approximately
190
mm.
.
Temperature
of
the
oven
and
vessel
The
oven
and
the
empty
vessel
are
at
ambient
temperature
prior
to
the
start
of
the
fest.
.
Temperature
of
the
water
The
initial
temperature-of
the
water
is
(10
+
2)°C.
Select
the
initial
and
final
water
temperature
so
that
the
maximum
difference
between
the
final
water
temperature
and
the
ambient
temperature
is
5K.
.
Select
stirring
devices
and
measuring
instruments
in
order
to
minimize
addition
or
removal
of
heat.
The
graduation
of
the
thermometer
must
be
scaled
by
0.1°C
at
minimum
and
an
accurate
thermometer.
.
The
water
load
must
be
(1000
+
5)
g.
.
“t"
is
measured
while
the
microwave
generator
is
operating
at
full
power.
Magnetron
filament
heat-up
time
is
not
included.
ot
oO
a
BF
WwW
HN
NOTE:
The
operation
time
of
the
microwave
oven
is
“t
+
2”
sec.
2
sec.
is
magnetron
filament
heat-up
time.
.
Measuring
method:
1.
Measure
the
initial
temperature
of
the
water
before
the
water
is
added
to
the
vessel.
Example:
The
initial
temperature
T?
=
11°C
2.
Add
the
1
litre
water
to
the
vessel.
3.
Place
the
load
on
the
centre
of
the
sheif.
14

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