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Sunday, February 14, 2016

[appliance-repair] Digest Number 2451

1 Message

Digest #2451
1a

Message

Sat Feb 13, 2016 5:01 am (PST) . Posted by:

chatinri


One cup (8 oz.) of room temperature water (approximately 75 degrees) will
boil at High power (100%) in:
A. High wattage oven (850-1000 watts) in less than 2 minutes.
B. Full power oven (650-850 watt) in 2-3 minutes.
C. Lower power oven (400-650 watt) in 3-4 minutes.
The following test will provide a suitably accurate measurement of the
output power of any microwave oven. Variations or errors in performing this
test will produce uncertain results. If the line voltage (from the electrical
outlet) is low, the magnetron output will be correspondingly low.
Equipment needed:
* Microwave safe container with 1000 mL (1 Liter) gradation.
· Fahrenheit thermometer, or centigrade thermometer
· Procedure:
1. Pour exactly 1000 mL (1 Liter) of cool tap water into he
container. Using the thermometer, stir the water, then measure and record the
temperature. For accurate results the water should be about 60 degrees F (20
degrees C).
2. Place the container on the center of the oven cooking shelf (do
not leave the thermometer in the container and remove any metal racks), and
heat the water (at full power) for 63 seconds. Use the second hand of a
watch, not the oven timer.
3. After the heating time is completed, immediately remove the
container, stir the water, re-measure and record the temperature of the heated
water.
4. Subtract the starting water temperature (step 2) from the ending
water temperature (step 3) to obtain the temperature rise.
5. To determine the output power in watts, multiply the total
temperature rise by a factor of:
38.75 , if you're using a Fahrenheit thermometer;
70 , if you're using a centigrade thermometer.



In a message dated 2/12/2016 5:58:20 A.M. Eastern Standard Time,
appliance-repair@yahoogroups.com writes:




Am I right to think the formula needs the user to input temperature rise
in degrees C (rather than degrees F) - it doesn't seem to say?

All the best,

Rich.

On Fri, 12 Feb 2016, Ian Tilley ian.tilley@gmail.com [appliance-repair]
wrote:

> When I used to repair microwaves, I always did a test on the output of
the
> microwaves. I was trying to remember the exact formulae (it's been a
while)
> so to refresh my memory, i did a google and came across this instruction
> leaflet for a tester with the exact details required.
>
>
http://martindale-electric.co.uk/manuals/manMARTEK500.pdf?osCsid=db87fc2026e2e5f0c1a672bf30bc1df1
>
>
>
> On 12 February 2016 at 18:18, GARY HENSHAW gary.henshaw@btinternet.com
> [appliance-repair] <appliance-repair@yahoogroups.com> wrote:
>
>>
>>
>> Just a thought John,
>> how about checking how long it takes to boil a known quantity of water,
>> say 200ml? Then compare against a different model (a friend's?), making
due
>> allowance for any difference in claimed power.
>>
>> To be honest I don't know enough about microwaves to be able to say
>> whether the claimed '1000w&#39; or whatever is the AC mains power input, or
the
>> actual microwave power output.
>> Gary.
>>
>>
>>
>>
>
>
>
> --
>
> Kind regards
>
> Electric Ian (WA)
> 08 9399 9316
> 0434 039 095
> www.electricianwa.com.au
> EC11705
>




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