[Boatanchors] One more point 120 vac Variac

[Pete Lancashire]

Regardless of what the markings are, you need to know the input
voltage, or just get a $10 Chinese digital AC voltmeter

for example http://www.sureelectronics.net/goods.php?id=483

there are many others.

-pete





On Tue, Jun 14, 2011 at 8:42 AM,  <WA5CAB at cs.com> wrote:
> GR is neither the only nor the largest producer of variable
> autotransformers.  More industrial systems I have seen are/were equipped with Powerstats,
> not Variacs.  I have four units here.  One is GR, three are not.  The dial
> plates of two read "0-140" and "VOLTS AC".  The other two just read "0-140".
>
> In a message dated 6/14/2011 9:28:00 AM Central Daylight Time,
> 1oldlens1 at ix.netcom.com writes:
>> ----- Original Message -----
>> From: "Rob Atkinson" <ranchorobbo at gmail.com>
>> To: "Dick KF4NS" <kf4nsradio at verizon.net>
>> Cc: <boatanchors at mailman.qth.net>
>> Sent: Tuesday, June 14, 2011 6:56 AM
>> Subject: Re: [Boatanchors] One more point 120 vac Variac
>>
>>
>> >I know I have seen some graded in volts but mostly it is %.
>> >
>> >My guess is % is used because then a single round
>> >graduation plate can
>> >be made for a number of different models and voltages.
>> >
>> >Rob
>> >K5UJ
>>
>>     Not according to the General Radio catalogues. The dials
>> are calibrated in _volts_. There are two scales on most, one
>> on each side, for the two ranges. For 115V nominal Variacs
>> the ranges are 0-115 and 0-140V on the overvoltage side. The
>> range depends on the connections made on the terminals.
>> Portable Variacs have a terminal board on one side. The
>> exceptions are stacked arrays which have dials calibrated
>> from 0 to 10, and, of course, 220V units which have
>> appropriate voltage calibration.
>>     I looked at several catalogues spanning perhaps a thirty
>> year period and can find NO Variacs with percentage scales,
>> although they may have been made.
>>
>>
>> --
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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