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Re: [TCML] Shinola meter, parts wanted or for free distribution -review
That 1K resistor you replaced in your Fluke is a special current limiting
"fusible" resistor. Be sure you replace it with the same kind for safety's
sake!
Hank
> [Original Message]
> From: bartb <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Date: 2/3/2009 7:41:03 PM
> Subject: Re: [TCML] Shinola meter, parts wanted or for free distribution
-review
>
> I've done similar to a Fluke 77. Totally dead. However, it came in real
> handy a couple months ago. I happened to have a second Fluke 77 that I
> killed the voltage measurement function on. I looked at the board and a
> 1W resistor was fried. Opened up the old dead Fluke and used it's
> resistor as the replacement (identical). Presto, Fluke was up and
> running and good as new (no calibration necessary as it was a current
> limiting resistor off the main probe connection).
>
> So even though you might kill a meter, keep it around for parts. You
> just never know when it will come in handy. Of course it took 10 years
> before it came in handy, but it sure made a quick 15 minute repair
possible.
>
> Bart
>
> Antonio Carlos M. de Queiroz wrote:
> > Jim Mora wrote:
> >> This Sinometer accidently tried to measure 120v AC on the ohms scale,
> >> certainly not the first time I have done that during my longish
> >> career. It
> >> is the first time I nearly needed a fire extinguisher for taming a
> >> DVM ;-
> > About destroying cheap meters: I had one actually not bad, and was
> > trying to
> > measure about 25 kV by connecting the meter to measure the current
> > trough a
> > high-voltage resistor made from a series of 5.6 MOhm resistors.
> > Everything fine, until I turned off the system, and turned off the
> > meter too.
> > Some minutes later, I resumed the measurements, and turned on the HV,
> > forgetting
> > to turn the meter to the microamperes scale first. The result was 25 kV
> > inside the meter without any protection and sparking everywhere. The
> > large
> > resistor in series was not enough protection. No marks visible in the
> > board,
> > but the meter is dead.
> >
> > Antonio Carlos M. de Queiroz
> >
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