analog watt meter

[Oracle]

hi,

where can i buy an analog lab watt meter? and what's the average price?

specification:
single phase, max 10 A 400V class: 1,5, 1 or 0.5

[The Electrician]

What accuracy do you require?  Do you want an electronic meter, or will an electromechanical one do?

[Oracle]

electromechanical possibly.

[The Electrician]

A meter such as this:

http://www.ebay.com/itm/Meter-wattmeter-Simpson-model-79-750-watts-10-amps-Max-150-volts-Max-NEW-/150884113846?pt=LH_DefaultDomain_0&hash=item232164ddb6

can provide an accuracy of several percent.

These Yokogawa meters are specified as 1/2 percent:

http://www.ebay.com/itm/YEW-Portable-Single-Phase-Wattmeter-Type-2041-10390M-Yokogawa-Tests-OK-/261115411482?pt=LH_DefaultDomain_0&hash=item3ccbb0fc1a

http://www.ebay.com/itm/YEW-Yokogawa-Portable-Single-Phase-Wattmeter-2041-/150633707952?pt=LH_DefaultDomain_0&hash=item231277f9b0

These meters typically don't have a 400 volt rating for the voltage coil, but you can add an additional multiplier resistance to increase the input voltage rating.

[Oracle]

ok. thanks. Price is interesting.... Guess something new would be over 250 $.

[SeanB]

If you buy a cheap standard 60A household meter you can make current transformers to increase sensitivity. I did that for myself, using a 10:1 CT to drop the FS range from 60 to 6A, it just reads 10x faster.

[The Electrician]

The Yokogawa meters run about US$650 new.  They're really nice however.  Mirrored scale, taut band suspension, double mumetal sheilding for the movement.

An alternative might be the Gossen Metrawatt Power meter.  I think Dave used one in a review.

[Oracle]

The Yokogawa meters run about US$650 new.  They're really nice however.  Mirrored scale, taut band suspension, double mumetal sheilding for the movement.

An alternative might be the Gossen Metrawatt Power meter.  I think Dave used one in a review.

yes, they are nice, but if a new meter runs about $650 which is the equivalent of 500 euros, probably i would take an electronic one which has better performance, and it's computer controlled so you can use some monitoring/measure software.

I don't know Grossen Metrawatt instruments: never used and heard about them. I only used a Hameg HM8115-2.

[Oracle]

If you buy a cheap standard 60A household meter you can make current transformers to increase sensitivity. I did that for myself, using a 10:1 CT to drop the FS range from 60 to 6A, it just reads 10x faster.

 but where i get a household meter + the ferrite core for the transformer?

[SeanB]

Electrical wholesalers or other electrical suppliers for the meter. The core is not a ferrite but a wound core from a small toroidal transformer, or you can use any small mains transformer and remove the windings with a knife and use the core and the bobbin. You are winding 2 simple windings, one of a single turn of 10mm wire as the secondary and a 10 turn one of 2.5mm wire as primary.

[Oracle]

Electrical wholesalers or other electrical suppliers for the meter. The core is not a ferrite but a wound core from a small toroidal transformer, or you can use any small mains transformer and remove the windings with a knife and use the core and the bobbin. You are winding 2 simple windings, one of a single turn of 10mm wire as the secondary and a 10 turn one of 2.5mm wire as primary.

 it's interesting... but what household meter should i have, an old electromechanical one or a digital one?

[SeanB]

Any one will do, depending on what you want to do. They both have advantages and disadvantages for measuring.

[Oracle]

Any one will do, depending on what you want to do. They both have advantages and disadvantages for measuring.

of course same for multimeter.

I'm looking for something like this?

http://www.ebay.it/itm/contatore-elettrico-di-energia-tipo-enel-220-volt-/170429311183?pt=Attrezzature_e_strumentazione&hash=item27ae60e8cf

Because the electronic one it's very expansive than this one. 

[Oracle]

I would like to share this, speaking about analog instrument/meter ecc ecc :

http://www.ganzinst.hu/products/portables/port_selector.htm

all instruments are class 0.5 or 1.

Don't know the price list....