[mythtv-users] Electrical power in my cable line? Is that bad?

Brian Wood beww at beww.org
Thu Sep 6 14:43:52 UTC 2007

Larry Sanderson wrote:
> Sure - just take a multimeter, set it to DC voltage in the 10V range, 
> touch one end of the probe to the metal screw on the coax cable, and 
> stick the other end in the 3rd prong (ground) of the outlet you plug 
> your computer into.  You should get zero volts if everything is 
> properly grounded.
> Make the multimeter more sensitive (set it to the 0.1V range) and 
> repeat.  If you get zero volts (or close to it) at the most sensitive 
> setting, then you should be good to go.
> On Thursday 06 September 2007 09:11:13 am Yann Lehmann wrote:
>> Brian J. Murrell wrote:
>>> Probably OP was looking for a more "diagnostic" method of testing
>>> his actual cable line, like with a multimeter or something, rather
>>> than having to visually inspect and identify whatever hardware the
>>> cableco may have installed.
>> Yes, indeed.

You might also want to check with the meter in "AC" mode.

A multimeter that provides at least some load, such as a 20,000
ohms/volt unit, might give you a more realistic reading than one with a
high input impedance (11 MegOhms or more), as the latter essentially
gives you an "open circuit" or unloaded voltage.

But the empirical "feel something" factor pretty much tells you that
something is wrong. Have an expert check things out.



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