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Author Topic: line voltage monitor  (Read 613 times)
N2JXN
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Posts: 189




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« on: October 08, 2007, 06:34:16 PM »

Hello and thanks for reading this. Does anybody know of either a place to buy a line voltage monitor or have a schematic to build one. It seams that where i live is subject to varying voltage. And I think this is the problem I have been having. I need to monitor the line voltage on both legs of the house line. And thanks again for taking the time to read and respond.
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K3JVB
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« Reply #1 on: October 08, 2007, 07:00:48 PM »

I only need to watch the plate vol;tage on my amp :/

It will vary from 2800 volts to 3200 voltz, depending on the time of day...and temps. When it is hot, and more neighbors bring the AC online it will drop.

But I too would like build one.
73
JohnB
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N6AJR
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Posts: 9908




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« Reply #2 on: October 08, 2007, 07:09:02 PM »

I bought a cheepie on ebay, Prime Products is the manufacturererer.  I think I did a search on 120 volt meters
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KB1GTX
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Posts: 460




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« Reply #3 on: October 08, 2007, 07:19:47 PM »

"It will vary from 2800 volts to 3200 voltz, depending on the time of day"

I had this same problem, it was a broken ground on the STREETS groung wire, and the houses were grounding through the city water pipes.
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N2JXN
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Posts: 189




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« Reply #4 on: October 08, 2007, 07:23:09 PM »

Yep Thanks for the input. If you find the model number of that meter if you could post it here. thanks
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KS2G
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Posts: 412




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« Reply #5 on: October 08, 2007, 07:40:05 PM »

MFJ-850B Line Monitor  $24.95
http://www.mfjenterprises.com/products.php?prodid=MFJ-850B
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AD5X
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Posts: 1430




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« Reply #6 on: October 08, 2007, 07:53:18 PM »

I have one of these and it works well:
http://www.amazon.com/exec/obidos/ASIN/B00009MDBU/backpacker4li-20

Phil - AD5X
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AC5E
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Posts: 3585




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« Reply #7 on: October 09, 2007, 03:57:36 AM »

It would be a very good idea to check your own house wiring for a bad ground. It may not be your neighbors causing a voltage drop, it may be you!

The "single point ground" for the electric service has a really bad habit of coming adrift at the ground rod, and I have seen a lightning strike melt the soil around a rod turning it into glass. Very nonconductive glass! And without harming a thing in the house.

73  Pete Allen  AC5E
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WA3SKN
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Posts: 5486




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« Reply #8 on: October 09, 2007, 04:17:09 AM »

Are you looking for a simple voltmeter, or a chart recorder of some type?
Voltmeters cost next to nothing.  You would probably want to rent a recording device.

-Mike.
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WD4CHP
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Posts: 147




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« Reply #9 on: October 09, 2007, 05:00:06 AM »

Ask your power company to put a recorder on your service. This way you will be able to use quality equpment without shelling out the big bucks.
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KZ1X
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Posts: 3228




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« Reply #10 on: October 09, 2007, 06:26:53 AM »

Here's the Horse's Mouth when it comes to such things:

http://www.dranetz-bmi.com//products/products.cfm

The term 'Dranetz' is like 'band aid' or 'kleenex' in that the brand itself is the benchmark for the application ... at least among those who make this science their business.
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KB9YUR
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Posts: 229




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« Reply #11 on: October 10, 2007, 03:03:01 AM »

Get yourself a large enough capacity UPS (like an APC
SU1000 or larger) which has it own voltage monitor and
it will protect your equipment from voltage spikes,
noise, brownouts and blackouts. I run the APC Smart
SU1000 ahead of all my equipment here.
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KE4DRN
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Posts: 3724




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« Reply #12 on: October 11, 2007, 06:23:45 PM »

hi,

the UPS is a good idea, the SU model is full sine wave,
also check for used ups in your area on ebay,
Liebert and Best are good full sinewave units.
Most of the time you can pick it up local or
have them ship w/o the batteries.

73 james
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KB3MDT
Member

Posts: 199




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« Reply #13 on: October 12, 2007, 07:48:21 PM »

Hi,
  I was curious about the line voltage fluctuations in my house as some of the florescent ceiling lights didn't want to "start" at times.  
  I found something cheap called a Kill O Watt meter. See http://cableorganizer.com/kill-a-watt/.  This might not be the cheapest price - search the web.
  Enjoy.

K3BMDT
Ken
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