[Test-Equipment] ESR meter reviews

[Richard Knoppow]

----- Original Message ----- 
From: "Dale H. Cook" <radiotest at plymouthcolony.net>
To: <test-equipment at mailman.qth.net>
Sent: Monday, June 27, 2011 5:08 PM
Subject: Re: [Test-Equipment] ESR meter reviews


> At 06:42 PM 6/27/2011, Richard Knoppow wrote:
>
>>  ... a General Radio megohmeter. The later
>>works fine but has a fixed test voltage of 500V,
>
> Which model? Mine is a 544-B, with the 544-P3 power 
> supply. That
> supply can be set up for 500 or 100 volts (you have to 
> open up the
> case to change the shorting links).The manual explains how 
> to adjust
> the 500 volt supply for as little as 200 volts. With a 
> little work
> you should be able to substitute an external supply of no 
> more than
> 500 volts (the limit is the bridge dissipation) leaving 
> the internal
> supply to power the detector.
>
> Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
> http://plymouthcolony.net/starcity/radios/radtop.html
>

     Mine is a Type 1862-A. This has a 500V supply since 
that is a standard for testing insulation in machinery. It 
is possible to disable the internal supply and use an 
outboard one of lower voltage but it is a  bit of a  PITA 
since you have to open the case and disconnect the rectifier 
tube. The procedure is described in the handbook.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com