MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
M icrowave output pow er can be checked by indirectly m easuring the tem perature rise of a certain am ount of w ater exposed to
the m icrow ave as directed below.
PROCEDURE
1. M icrow ave pow er output m easurem ent is m ade w it the m icrow ave oven supplied at rated voltage and operated at its
m axim um m icrow ave pow er setting w ith a load of 1000 ± 5cc of potable w ater.
2. T he w ater is contained in a cylindrical borosilicate glass vessel having a m axim um m aterial thickness of 3 m m and an outside
diam eter of approxim ately 190 m m .
3. T he oven and the em pty vessel are at am bient tem perature prior to the start of the test. T he initial tem perature of the w ater is
10 ± 2 ° C (50 ± 3.6 ° F ). It is m easured im m ediately before the water is added to the vessel. A fter addition of the w ater to the
vessel, the load is im m ediately placed on the center of the shelf, w hich is in the low est norm al position.
4. M icrow ave pow er is sw itched on.
5. H eating tim e should be exactly A seconds (R efer to table as follow ing).
H eating tim e is m easured w hile them icrow ave generator is operating at
full pow er. The filam ent heat-up tim e for m agnetron is not included.
6. T he initial and final tem perature of w ater is selected so that
the m axim um difference between the am bient and
final w ater tem perature is 5K .
7. T he m icrow ave pow er output P in w atts is calculated
from the follow ing form ula:
•
T is difference betw een initial and ending tem perature.
•
t is the heating tim e.
T he pow er m easured should be B (R efer to S P E C IFIC ATIO N S ) W ± 10.0 % .
H eating tim e for pow er output:
A (second)
70
64
60
56
52
49
47
44
42
40
38
B (W )
600
650
700
750
800
850
900
950
1000
1050
1100
P = 4187 x
T/ t
CAUTION
1. W ater load should be m easured exactly to 1 liter.
2. Input power voltage should be exactly specified voltage (R efer to S P E C IF IC AT IO NS ).
3. A m bient tem perature should be 20 ± 2° C (68 ± 3.6° F )
