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Achille
Joined: 12 Jun 2017
Posts: 25
Location: Europe
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 Posted: Wed Mar 20, 2019 4:11 am Post subject: Still noisy voltmeter |
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Hi all,
I send a message because I have since months a noisy voltmeter after the total change of my electrical system. And I tried to resolved it without good evolution.
I have used the book of bob, and it's the Z19 electrical diagram or very close to.
I have 2 votmeters, one for main batterie and the other one for the aux bat 7amp/h bat. Set with one 2 way switch.
The both voltmeters are on the same place and the wire of each other are a wire harness. This wire harness pass below my VHF. And just the voltmeter 1 (Main system) is noisy. The other not. (pictures below)
My voltmeter 1 was set on the ESS bus bar after the diode. I tried to connect it before the diode. And in this case it's a bit (but still noisy) less noisy.
I have the noise a low level when I set voltmeter in ON and intercom ON, and when I set radio in ON the noise is higher.
In all case if I set my voltmeters in OFF no more noise.
Voltmeters switch ON but voltmeter 1 disconnected no noise... 
Any idea ? Thank you
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user9253
Joined: 28 Mar 2008
Posts: 1926
Location: Riley TWP Michigan
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| Posted: Wed Mar 20, 2019 5:13 am Post subject: Re: Still noisy voltmeter |
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How is voltmeter 1 grounded? I suggest to NOT ground the voltmeter to the
airframe. Instead, twist the positive and negative wires together all of the way
from the voltmeter to the battery. At the switch, loop the ground wire around
the switch, then continue the twisted pair to the battery.
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Joe Gores |
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Achille
Joined: 12 Jun 2017
Posts: 25
Location: Europe
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user9253
Joined: 28 Mar 2008
Posts: 1926
Location: Riley TWP Michigan
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| Posted: Fri Mar 22, 2019 5:07 am Post subject: Re: Still noisy voltmeter |
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No, I did not mean to connect the ground wire to the switch. What I meant was to run the positive and negative wires as a twisted pair all of the way from the source to the voltmeter (as much as possible). Try to avoid a single wire. If the wires are twisted together, radiated energy will be minimized.
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Joe Gores |
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