Triplett 660 Watt Meter

[glene77is]

Anybody every used a Triplett 660 Watt Meter?
I have one, which has been modified, and may be missing a cable.

Before I start into reverse engineering on this old Watt meter,
I would like some guidance on its actual use.

 

[LarryFine]

What if you need to measure more than 660 watts?

 

[gar]

090130-2018 EST

glene77is:

If this is basically an analog meter using two coils to perform the required instantaneous multiplication, then the voltage coil is connected to the needle, moves, is a high resistance, and probably has a series resistor to scale the voltage, and the fixed coil that the moving coil interacts with is the current coil. If no external current transformer is used, then there is a basic current rating of the current coil relating to the full scale power rating of the meter.

See:
"Basic Electrical Measurements", by Melville B Stout, 1950, Prentice-Hall.
Look up Indicating instruments - electrodynamometer movement - 418 - 423, and 442 - 450.

Although this book has been scanned by Google the snippets are next to useless. However, your engineering library may have a copy.

.

 

[gar]

090130-2157 EST

glene77is:

Just looked at my Simpson 75 W wattmeter. It is rated 150 V max, and 1 A max. This kind of meter will work at DC, become flaky between DC and somewhere below 60 Hz, and will be good for some range starting below 60 and going above 60, maybe up to 400.

The problem between DC and 60 is a result of the averaging time constant of the mechanism.

.

 

[glene77is]

To All,

Thanks for the input.

Have found a link, from your suggestions, that perports to sell a used book.

I am an engineering type, and like to tinker.
What I measure is not always as important as the ability to measure,
much to the consternation of my associates.
When I got my first hand-held calculator
I proceeded to calculate the wattage of everything in our facility,
even the actual power consumed by a partially un_lamped flourescent fixture.

BTW, any body ever tried running a f12t8 tube on an 80 Watt ballast?
I can relate to you that it is a very en-lightening experiment!

Thanks for the input.
Need to go buy that used book, just $8.

 

[iwire]

This page http://www.radioera.com/t-manuals.htm claims to have a manual for that meter.