http://www.ios.doi.gov/pam/eneratt2.htm
Give the above link a try. 3412 BTU = 1 kWh
1 watt = 3.412 BTU/Hr
293 watts = 1000 BTU/Hr.
Watts dissipated = watts inDon't confuse volt amps with watts.
Jim Allan
Senior Compliance Engineer
Milgo
You cannot perform a characterization that will mean anything. The room will
have standing waves that will be strongly dependant upon the size and
placement of the unit under test, the placement of the antenna and the
frequency. The best that you can do is perform a pretest to find the
frequencies
Scott,
1W/hr = 3.413BTU/hr
1Kw/hr = 3,413 BTU/hr
John A. Juhasz
Product Qualification
Compliance Engr.
Fiber Options, Inc.
80 Orville Dr. Suite 102
Bohemia, NY 11716 USA
Tel: 516-567-8320 ext. 324
Fax: 516-567-8322
-Original Message-
From: s_doug...@ecrm.com
Hi Scott:
Under the law of the conservation of energy, all of the energy
going into a product must be accounted for.
Energy is measured in joules.
One joule is one watt-second.
One watt is one joule/second.
All of the watts entering the product must be accounted for.
All of the watts are
Scott,
One British thermal unit (Btu) is the quantity of heat or thermal energy
required to raise the temperature of one pound of pure water one degree F.
The unit for thermal energy is the joule (J). One kilojoule = 0.9478 Btu.
The watt (W), equal to joule per second (J/s), is used for power,
It is not so much that red not be used, but that it not be used for safe,
normal, expected conditions of the equipment.
One example of this is a PREFERENCE stated in EN 60204-1 section 10.3.2. (It
does allow deviations based on specific agreement with customers.)
I think the underlying thought
Multiply watts by 3.415 to obtain BTU/hour. To compute the input power you
need to multiply the rms voltage, rms current and power factor. Or you can
cheat and use a wattmeter.
--
From: s_doug...@ecrm.com [SMTP:s_doug...@ecrm.com]
Sent: Tuesday, April 27, 1999
From what I remember in High School and College, Fo (actually it was
omega-naught) was originally used to designate the resonant frequency
of an LC network. I would then surmise that Fo, over the years, has
been carried over to designate the primary frequency of oscillation.
Fourier series and
My company is planning to purchase a screen room for radiated emissions
precompliance testing.
I'm aware that reflections can cause resonances and drastically influence
readings. What kind of testing could I do to characterize the room (aside from
simple experience)?
--
Patrick Lawler
According to a table of Conversion Factors that I found on page 18 of the
December 1991 Electrical Manufacturing magazine, and keep stashed in my
dictionary here at work:
Watts * 3.413 = BTU's/hour
I use the maximum input power (wattage) that we have measured for a product in
its various
Hello,
Does anyone know how to compute heat dissipation for a product given mains
power input (volts, amps, watts)?
Our spec sheets always list heat dissipation (e.g. 1,000 BTU/hour) for
each product and I wonder where the number comes from and why it never
changes from one product to the next.
Several years ago I remember that indicators could not be red in color. This
requirement seems to have gone away per EN60950 1.7.8.2. Could the group
provide me with a bit of history as to where the original requirement to be
not red came from. Was it a part of the German GS mark requirements or
To everyone,
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status. I am looking for work in either EMC, Regulatory Compliance or
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To everyone,
I have just arrived in Canada from France and have landed immigrant
status. I am looking for work in either EMC, Regulatory Compliance or
Quality Management. I have a PhD in Electronics with a specialization
in EMC and six years experience in this field. I have knowledge of
Safety,
The Northeast Product Safety Society, Inc.
2 Milliston Rd. Suite 2GN, Millis, MA 02054 U.S.A.
The Northeast Product Safety Society, Inc. meets on the fourth Wednesday
of each month (except for July, August and December) and the third
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