Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:iqs93v$lv7$1@reader1.panix.com...
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one
minute,
you'd be running in that first minute at a power level that would cause
localized boiling. (This is a problem with soups and oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a
cycle
of less than one second is used.
1 second seems pretty excessive. I don't recall what the timing cycle on
the Tappan ones were, but it was less than a minute for sure, but not
every few seconds.
What do you mean by excessive? If a magnetron can be modulated by varying
its B+, why shouldn't each PWM cycle be just one or two seconds long? You DO
NOT want the magnetron running at full power for "long" periods, followed by
even longer periods off (eg, one minute, four minutes off, for 20%).
I really liked those older machines. They were easy to use. I still don't
get why a microwave oven needs multiple buttons pressed to heat food.
It used to just be, turn the timing knob and press start. That's it.
My GE has six instant-start buttons, for one through six minutes.
1 second seems pretty excessive. I don't recall what the timing cycle onSome of the older US made units from Litton or Tappan had
a giant reed relay, and the HV was actually switched on and
off for the defrost mode. They made a nice sound switching
on and off.
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one minute,
you'd be running in that first minute at a power level that would cause
localized boiling. (This is a problem with soups and oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a cycle
of less than one second is used.
As far as I know, my 10-year-old GE is a "newer" model.William Sommerwerck <grizzledgeezer@comcast.net> wrote:
What do you mean by excessive? If a magnetron can be modulated
by varying its B+, why shouldn't each PWM cycle be just one or two
seconds long? You DO NOT want the magnetron running at full power
for "long" periods, followed by even longer periods off (eg, one minute,
four minutes off, for 20%).
If you like switching a kilowatt sized transformer on and off every
second, power to you. Same for a reed relay rated at kV at hundreds
of mA.
It would obviously be easier with one of those switching power supply
microwaves, but that's not how the old microwaves worked.
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:iqsm5d$ap4$1@reader1.panix.com...
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
What do you mean by excessive? If a magnetron can be modulated
by varying its B+, why shouldn't each PWM cycle be just one or two
seconds long? You DO NOT want the magnetron running at full power
for "long" periods, followed by even longer periods off (eg, one minute,
four minutes off, for 20%).
If you like switching a kilowatt sized transformer on and off every
second, power to you. Same for a reed relay rated at kV at hundreds
of mA.
It would obviously be easier with one of those switching power supply
microwaves, but that's not how the old microwaves worked.
As far as I know, my 10-year-old GE is a "newer" model.
This has become one of those "inquiring minds want to know" questions. There
are leakage meters, which would show changes in level. Does anyone make a
power meter you can place in the cavity?
If you like switching a kilowatt sized transformer on and off every"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:iqs93v$lv7$1@reader1.panix.com...
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one
minute,
you'd be running in that first minute at a power level that would cause
localized boiling. (This is a problem with soups and oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a
cycle
of less than one second is used.
1 second seems pretty excessive. I don't recall what the timing cycle on
the Tappan ones were, but it was less than a minute for sure, but not
every few seconds.
What do you mean by excessive? If a magnetron can be modulated by varying
its B+, why shouldn't each PWM cycle be just one or two seconds long? You DO
NOT want the magnetron running at full power for "long" periods, followed by
even longer periods off (eg, one minute, four minutes off, for 20%).
You might get by with a cup of water and a light bulb. Neon lights with"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:iqsm5d$ap4$1@reader1.panix.com...
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
What do you mean by excessive? If a magnetron can be modulated
by varying its B+, why shouldn't each PWM cycle be just one or two
seconds long? You DO NOT want the magnetron running at full power
for "long" periods, followed by even longer periods off (eg, one minute,
four minutes off, for 20%).
If you like switching a kilowatt sized transformer on and off every
second, power to you. Same for a reed relay rated at kV at hundreds
of mA.
It would obviously be easier with one of those switching power supply
microwaves, but that's not how the old microwaves worked.
As far as I know, my 10-year-old GE is a "newer" model.
This has become one of those "inquiring minds want to know" questions. There
are leakage meters, which would show changes in level. Does anyone make a
power meter you can place in the cavity?
No,it's longer than that. probably a minimum of ~10 seconds.William Sommerwerck <grizzledgeezer@comcast.net> wrote:
Some of the older US made units from Litton or Tappan had
a giant reed relay, and the HV was actually switched on and
off for the defrost mode. They made a nice sound switching
on and off.
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one
minute, you'd be running in that first minute at a power level that
would cause localized boiling. (This is a problem with soups and
oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a
cycle of less than one second is used.
1 second seems pretty excessive. I don't recall what the timing cycle
on the Tappan ones were, but it was less than a minute for sure, but
not every few seconds.
Maybe it's cheaper to use a digital timer than a mechanical timer.I really liked those older machines. They were easy to use. I still
don't get why a microwave oven needs multiple buttons pressed to heat
food. It used to just be, turn the timing knob and press start. That's
it.
The problem -- as I've repeatedly stated -- is that if the "on" part of the1 second seems pretty excessive. I don't recall what the timing
cycle on the Tappan ones were, but it was less than a minute
for sure, but not every few seconds.
I started using my combo oven turbo/microwave and I was disappointedCydrome Leader <prese...@MUNGEpanix.com> wrote innews:iqs93v$lv7$1@reader1.panix.com:
William Sommerwerck <grizzledgee...@comcast.net> wrote:
Some of the older US made units from Litton or Tappan had
a giant reed relay, and the HV was actually switched on and
off for the defrost mode. They made a nice sound switching
on and off.
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one
minute, you'd be running in that first minute at a power level that
would cause localized boiling. (This is a problem with soups and
oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a
cycle of less than one second is used.
No,it's longer than that. probably a minimum of ~10 seconds.
you can tell by the change in sound of the oven,the magnetron loads more
when it's cooking.
1 second seems pretty excessive. I don't recall what the timing cycle
on the Tappan ones were, but it was less than a minute for sure, but
not every few seconds.
I really liked those older machines. They were easy to use. I still
don't get why a microwave oven needs multiple buttons pressed to heat
food. It used to just be, turn the timing knob and press start. That's
it.
Maybe it's cheaper to use a digital timer than a mechanical timer.
Although ISTR seeing some low-end MW ovens that still had the mech.timer.
But people want the flexibility of using their MW for more than simple
reheating/cooking tasks. My GE has all sorts of functions I never
use,mostly sensor cooking.
--
Jim Yanik
jyanik
at
localnet
dot com
Our Panasonic cycles in the 5 - 15 second range."Jim Yanik" <jya...@abuse.gov> wrote in message
news:Xns9EE874DE4C417jyaniklocalnetcom@216.168.3.44...
1 second seems pretty excessive. I don't recall what the timing
cycle on the Tappan ones were, but it was less than a minute
for sure, but not every few seconds.
The problem -- as I've repeatedly stated -- is that if the "on" part of the
variable-power cycle is more than a few seconds -- possibly as short as 5
seconds, and /definitely/ 10 -- you're going to have localized boiling.
I occasionally see the oven's lights changing brightness, and hearing
various "cycling" noises. I'm going to have to check into this...
Use containers with straight vertical sides. The thinnest part of theSome of the older US made units from Litton or Tappan had
a giant reed relay, and the HV was actually switched on and
off for the defrost mode. They made a nice sound switching
on and off.
I'm curious as to how my GE works.
If, at 50% (say) you were full "on" for one minute, then off for one minute,
you'd be running in that first minute at a power level that would cause
localized boiling. (This is a problem with soups and oatmeal.)
I do not see that. Therefore, I have (???) to assume that PWM with a cycle
of less than one second is used.
There are a few things you can do.
I use huge ceramic cereal bowls. Heating soup or oatmeal at full power stillThere are a few things you can do.
Use containers with straight vertical sides. The thinnest part
of the material boils [???] first in a typical bowl. I've been acquiring
HUGE ceramic coffee mugs to cook soup.
With my oven, simply lowering the power does the trick. A big bowl ofThe other thing you can do is siphon off the energy with a cup of water.
Varying the amount of water and the power cycling can accommodate
most needs.
It seems to me that's exactly what you want.I've done some experiments with a dish that looks like a lemon juicer.
The donut shape of the liquid gets energy from all sides and can help
moderate the edge boiling. You'd really not want any thickness of the
subject material to be any thicker than the microwaves can penetrate.
Percent power may not be related to actual duty cycle. 50% is not 50%
on and 50% off. The ON time may be longer based on service info for a
Sharp Microwave, It takes time for the filament to warm up and there
may be reduced or no output. This is taken into account.