Who sells wattmeters?
Mitchell Jones
appliance into, then plug the wattmeter into the wall outlet, and get a
reading for the power consumption of the appliance. Does anybody make such
a gadget? If not, who makes power meters, anyway? TIA. --Mitchell Jones
=====================================================
Ren Tescher
These are the 'glass warts' the power company has outside your house.
You can cut a short extension cord in half and put the plug end on the input
and the socket end on the output then with a calender or clock you can
measure how much power it used over a period of time. Not great
for instantanious measurements, but you didn't ask for that and you
did ask for inexpensive.
Ren
dona nobis pacem
Fred E. Davis
wrote:
>I am looking for an inexpensive wattmeter ...
What meter?
>Yes.
Huh? What meter do you want.
>I want a watt meter.
That's what I said, "What meter?"
>That's the one I want!
I *know* that! But what meter?
>Yes!
Let's make this easy; you want a meter, right?
>Yes.
What meter?
>Sure, that's what I've been asking for!
What!
>Yep, that's the one.
Aiieeee.......
Fred E. Davis
wrote:
>I am looking for an inexpensive wattmeter that I could plug an AC
>appliance into, then plug the wattmeter into the wall outlet, and get a
>reading for the power consumption of the appliance. Does anybody make such
>a gadget? If not, who makes power meters, anyway? TIA. --Mitchell Jones
>=====================================================
If you want to build your own, check out "Optical Isolator Computes
Watts," by W. Stephen Woodward, Electronic Design, October 14, 1994,
pp. 100-102, and "Simple Digital AC Wattmeter" by W. Stephen Woodward,
Supplement to Electronic Design, October 22, 1998, pp. 15-17. Since
this attaches directly to mains power, do not attempt to build it
unless you have sufficient skill and experience.
Mitchell Jones
<tesch...@mayo.edu> wrote:
> Hebach & Rademan used to sell surplus kilowatt/hour meters for about $30.
> These are the 'glass warts' the power company has outside your house.
> You can cut a short extension cord in half and put the plug end on the input
> and the socket end on the output then with a calender or clock you can
> measure how much power it used over a period of time. Not great
> for instantanious measurements, but you didn't ask for that and you
> did ask for inexpensive.
>
> http://www.herbach.com
>
> Ren
> dona nobis pacem
***{Thanks, Ren. I checked the site out. They have their catalog online,
but I didn't find the type of gadget you described in the meters section.
Should I have looked elsewhere in the catalog? By the way, by
"inexpensive" I meant "less than $300," not "under $50." (Nowadays, thanks
to decades of inflation, you can't get diddley squat for less than $50.
:-) So far, the only plausible looking meter I have found along these
lines is the Extech 400A DC/AC Power DMM, which is claimed to do DC and AC
true power measurements to 240 kW. It is a clamp-on meter and lists for
$245. Does anybody out there have any experience with it? Any comments,
particularly concerning its limitations, would be welcome. TIA. --Mitchell
Jones}***
=====================================================
Mitchell Jones
<FED...@worldnet.att.net> wrote:
***{Thanks Fred. I'll check it out. --MJ}***
=====================================================
Mitchell Jones
kind of power meter I need. My immediate problem requires a power meter
that can measure what is roughly a 220 watt signal with an accuracy of 1
or 2 watts. I can be that specific because I have already determined the
power calorimetrically--i.e., by measuring the rate of heat output of the
device--and obtained a value of about 220 watts. As a double-check against
the calorimetry, however, I want to use a power meter. Does anyone have
any suggestions regarding a power meter that is suited to this very
specific problem? Thanks. --Mitchell Jones
=====================================================
Mitchell Jones
cosine of the phase angle. I already have a good DMM, so all I need is
some way to determine the phase angle. Does anyone sell a cheap meter that
indicates the phase angle of an AC waveform when a specific device is
being operated? --Mitchell Jones
=====================================================
Tom Van Baak
> I am looking for an inexpensive wattmeter that I could plug an AC
> appliance into, then plug the wattmeter into the wall outlet, and get a
> reading for the power consumption of the appliance. Does anybody make such
> a gadget? If not, who makes power meters, anyway? TIA. --Mitchell Jones
http://www.brandelectronics.com/
/tvb
Don Lancaster
Try the Brand Electronics wattmeter banner on my website at http://www.tinaja.com
I believe they can do custom units for higher ratings at fairly low cost.
--
Many thanks,
Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (520)428-4073 email: d...@tinaja.com fax 847-574-1462
Please visit my GURU's LAIR web site at http://www.tinaja.com