analog watt meter - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: December 23, 2012, 09:39:37 pm
content: 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

author: The Electrician
author_rank: Frequent Contributor
timestamp: December 27, 2012, 06:58:27 am
content: What accuracy do you require? Do you want an electronic meter, or will an electromechanical one do?

author: Unknown
author_rank: Unknown
timestamp: December 27, 2012, 10:54:57 pm
content: electromechanical possibly.

author: The Electrician
author_rank: Frequent Contributor
timestamp: December 28, 2012, 06:22:05 am
content: 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=item232164ddb6can 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=item3ccbb0fc1ahttp://www.ebay.com/itm/YEW-Yokogawa-Portable-Single-Phase-Wattmeter-2041-/150633707952?pt=LH_DefaultDomain_0&hash=item231277f9b0These 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.

author: Unknown
author_rank: Unknown
timestamp: December 28, 2012, 11:05:37 am
content: ok. thanks. Price is interesting.... Guess something new would be over 250 $.

author: SeanB
author_rank: Super Contributor
timestamp: December 28, 2012, 02:58:10 pm
content: 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.

author: The Electrician
author_rank: Frequent Contributor
timestamp: December 28, 2012, 02:58:55 pm
content: 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.

author: Unknown
author_rank: Unknown
timestamp: January 03, 2013, 07:25:00 pm
content: Quote from: The Electrician on December 28, 2012, 02:58:55 pmyes, 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.

author: Unknown
author_rank: Unknown
timestamp: January 03, 2013, 07:27:32 pm
content: Quote from: SeanB on December 28, 2012, 02:58:10 pmbut where i get a household meter + the ferrite core for the transformer?

author: SeanB
author_rank: Super Contributor
timestamp: January 03, 2013, 07:47:19 pm
content: 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.

author: Unknown
author_rank: Unknown
timestamp: January 03, 2013, 09:27:04 pm
content: Quote from: SeanB on January 03, 2013, 07:47:19 pmit's interesting... but what household meter should i have, an old electromechanical one or a digital one?

author: SeanB
author_rank: Super Contributor
timestamp: January 04, 2013, 04:47:43 am
content: Any one will do, depending on what you want to do. They both have advantages and disadvantages for measuring.

author: Unknown
author_rank: Unknown
timestamp: January 04, 2013, 07:55:22 am
content: Quote from: SeanB on January 04, 2013, 04:47:43 amof 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=item27ae60e8cfBecause the electronic one it's very expansive than this one.

author: Unknown
author_rank: Unknown
timestamp: January 04, 2013, 08:05:11 am
content: I would like to share this, speaking about analog instrument/meter ecc ecc :http://www.ganzinst.hu/products/portables/port_selector.htmall instruments are class 0.5 or 1.Don't know the price list....