[MRCA] Day to remember

[jeepp]

VE Day. 8 May 1942


Sent from my Verizon Wireless 4G LTE smartphone

-------- Original message --------
From: "B. Smith" <smithab11 at comcast.net> 
Date: 05/08/2016  9:29 AM  (GMT-05:00) 
To: mrca at mailman.qth.net, mrca at mailman.qth.net 
Subject: Re: [MRCA] Hamfest DVM modules 

Be Sure and check for RF noise before doing any final installation.
Couple of ferrite beads on the leads and keep wiring short.
Z

On 5/8/2016 9:10 AM, DSP3 wrote:
> For what its worth, I bought two of those small, pop-in 3-digit, panel 
> mount voltmeters at the Hagerstown fest, yesterday.  No documentation, 
> whatever, is provided.  The idea was to add them to a couple of LV 
> power supplies I have that are meterless.  Well, they don't work very 
> well, at all, I believe. They are powered by about 3-9v DC.  The ones 
> on display appeared to be just fine.  I wired both of them up to 
> batteries and power supplies and, with proper Vcc applied, got 
> readings typically 20-30% high along with a 2v-4v instability.  I 
> thought that perhaps the meters were responding to noise and/or ripple 
> but the 9v batteries connected exhibited the same error and 
> instability.  The meters do appear stable with only Vcc applied and 
> indicate 00.0v.   Anyone have any experience with these little DVMs?  
> Is additional filtering required?  Are they maybe AC meters with a 
> high crest factor and a bridge on the input?  I have no idea.......
>
> Jeep - K3HVG
>
>
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