[Heath] Heathkit VTVM Test Cables

[The Pollacks]

Only the later ones have the switch in the probe.  The earlier ones use 3 probes like the ones being sold on eBay.  The V7A, I believe, is among the last to use the 3 probe system.  I have a bunch of HK VTVMs, going back to 1950

Ron K2RP

 

From: Heath [mailto:heath-bounces at puck.nether.net] On Behalf Of Jack Crenshaw
Sent: Sunday, March 10, 2019 7:21 AM
To: heath at puck.nether.net
Subject: Re: [Heath] Heathkit VTVM Test Cables

 

That's right. There's sort of a rotary switch built into the probe. Rotate it one way, it's a direct connection. Rotate it the other way, it's got the 1M resistor in series.  I can't tell you how many V7-A's I've seen on eBay, that are working VTVMs but without the test leads.  Without that special probe, the VTVM is pretty much worthless.

As Dave says, you can buy a new probe kit from the link he gave.  I bought one, and it's a very nice kit.

Jack

On 3/10/2019 3:20 AM, James R Hain wrote:

DC test lead has a 1meg resister. 

 

Jim

 

On Sat, Mar 9, 2019, 4:11 PM Dave Edwards <kd2e at comcast.net> wrote:

There is a guy making them on ebay, if interested;

 

https://www.ebay.com/itm/Heathkit-New-Test-Leads-for-the-V-4-V-5-V-6-V-7-or-the-V-7A-VTVMs/254154799517?hash=item3b2cce799d:g:~d8AAOSwPQBbcdRL

 

....Dave

On 3/9/19 2:36 PM, Richard wrote:

I have Heathkit VTVM's that need new test cables. The cable for the IM-18 has the special phone plug and the AC and DC test wires with the AC-DC switch are both shielded within the same shield. Is it necessary to shield either or both of these test leads? It might make sense to shield the AC lead. 

I also have a V7-A that has the three input connectors. It came with test leads that are probably not original. In this case the DC test lead is shielded and the AC test lead is not shielded. Same question here. Is it necessary to shield either or both test leads? 

I need to make new test leads for both meters. 

My Fluke 179 does not have shielded test leads and works just fine. 

What am I missing? 


Richard KC9UB 



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