VTVM DC Probe

[Bob Krassa]

I suspect the new ones are better than the old ones, in which the plastic 
may have deteriorated or had contact with slightly conductive substances. 
But what I think you should consider is getting a Heath high voltage probe. 
There are several on eBay right now (not sold by me!).  They are made with a 
plastic guard to keep your hand from accidentally slipping off the 
probe...the regular DC probe provides no protection.  Just use the high 
voltage probe down to the lowest level that it can accurately measure.  The 
manual for the high voltage probe is available in the Heathkit directory on 
the BAMA website as 336.  As stated there, you can just use the 5 volt range 
on the VTVM to measure up to 500 volts, etc.  Of course, always start the 
VTVM at the highest range and step downward to avoid damage.

73 Bob KC0TDS

----- Original Message ----- 
From: "W6CUX" <w6cux at EARTHLINK.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, January 10, 2005 4:38 PM
Subject: [HEATH-TEMPE] VTVM DC Probe


> Hi all,
> I own a Heathkit V7A VTVM for whitch I long ago lost the DC
> probe and have decided to build up a replacement.
>
> I have all the parts except the phone plug that connects to
> the VTVM. My concern is that the plug can have as much as
> 1.5KV across it and I doubt that available plugs of today
> are insulated well enough to withstand that high a voltage.
>
> I welcome comments / solutions.
>
> 73, Stu W6CUX
>
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Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

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This list is a public service of the City of Tempe, Arizona
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