[Jukebox-list] Amp meter was Wurlitzer 2410S problem

[Joey McDonald]

Don,

The current will always take the shortest path to ground. Always.
In a parallel ckt, if you have a short, the other ckts will have
no current flow. They will stop working.

Those inductive volt tracers are really great.
Fluke and many othere have them.

Joey McDonald


----- Original Message ----- 
From: "Don" <dontutt at telus.net>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Friday, May 25, 2007 10:53 PM
Subject: Re: [Jukebox-list] Amp meter was Wurlitzer 2410S problem


> Hi Joey,
>
> Thanks for the tips. I'll add'em to my arsenal.
> Didn't know about the inductive volt tracers 'til you told me. Sounds 
> great.
>
> There were some assumptions I made in suggesting the ammeter trick in 
> circuit. I guess the main assumption being that there is a faulty, 
> partially shorted coil and if left powered on for some much longer time 
> than normal it will start to smell, apart from not doing its job properly. 
> So because it is a partial short it should not take out the meter's fuse 
> or damage the ammeter as long as the amp range setting is well above the 
> expected current draw.
>
> What I liked about the meter idea is that you can easily note the current 
> draw in the circuit legs that work fine and when you hit the partial 
> shorted leg it should be obvious by its somewhat large current draw.
>
> That said Steve's smell problem might be coming from something else.....
>
> Until the reason for the smell is found and fixed, there exists the 
> potential for a fire.
> So let's wish Steve well on his hunt for the problem.
> Don
>
>
> ----- Original Message ----- 
> From: "Joey McDonald" <joe400f at shaw.ca>
> To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
> Sent: Friday, May 25, 2007 5:36 PM
> Subject: Re: [Jukebox-list] Amp meter was Wurlitzer 2410S problem
>
>
>> Any multimeter that is capable of measuring amps should be fused 
>> internal.
>>
>> I use a Fluke 189 meter that is fused 20 amps.
>> I always test the ckt for shorts with a fused 15amp  jumper first
>> before hooking up the meter. This saves $$$ in fuses.
>> Fluke meter fuses can get expensive.
>> I was listening in on this disussion when I thought I would add my 2 
>> cents worth.
>>
>> I spend a lot of time tracing ckts for shorts.
>> I am GM tech and do electrical repairs all day long.
>> You would be amazed at the source for shorts
>> that I find everyday.
>> The multimeter should be used to measure current draw
>> not to find shorts. There is no need to measure current draw
>> on a shorted ckt. Repair the short then measure current draw
>> to see if it is within spec.
>>
>> The lamp idea is an old tried and true way to find a short.
>> Also using a ckt breaker is a cheap tool and works well.
>> If a ckt has many branches that run off 1 fuse, isolate ckts
>> by adding fuses to each branch. Then trace the isolated ckt for the 
>> source
>> of the short. Leave the extra installed fuses in place. They will
>> only help in future diagnosis if needed.
>>
>> There is also many inductive volt tracers now that can be bought for 
>> arounbd $25. Guide it along the ckt and when
>> the lite stops flashing or changes colour is where the voltage stops.
>> BINGO. You found the short.
>>
>> Finding a shorted ckt should not be too hard to diagnose.
>> Finding intermittent shorts requires the thinking cap.
>>
>> Hope this ramble helps someone.
>>
>> Joey McDonald
>>
>>
>>
>>
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