[Heathkit] Heathkit AT-1 Meter

[Mark K3MSB]

Well,  I further disassembled the meter.   Here's some pix and a short clip
to wow and amaze you......

www.k3msb.com/at1/front.jpg
www.k3msb.com/at1/bottom.jpg
www.k3msb.com/at1/top.jpg
www.k3msb.com/at1/side1.jpg
www.k3msb.com/at1/side2.jpg

www.k3msb.com/at1/clip1.mp4

I see no way to perform any adjustment.  loosening the small screw at the
bottom of the meter does nothing.

I assume that the two small discs are magnets   I was thinking of holding
one and attempting to rotate the other (or perhaps rotate the pointer).
Unless there is something that was magnetized during my tests, the only
other thing that could have happened to the meter was a force which moved
some of the parts, and an opposite force may help.    Of course, it could
bust things too.....

73 Mark K3MSB



On Tue, Jun 28, 2016 at 11:09 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:

> The meter glass,  face, etc was already removed before my last post.
>
> The meter has a metal case with glass front.
>
> Mark
> On Jun 28, 2016 11:06 PM, <hwhall at compuserve.com> wrote:
>
>> One more thing to try... Apply some moisture to the meter face.
>> "Fogging" it with your breath might be sufficient. Occasionally, some
>> meters can acquire a static charge on the meter face or body that pulls the
>> needle out of place. Plastic body meters seem most likely to do that. Some
>> folks recommend wiping on some thinned soapy water to prevent recurrence.
>>
>> Wayne
>> WB4OGM
>>
>> -----Original Message-----
>> From: Mark K3MSB <mark.k3msb at gmail.com>
>> To: Ronald Youvan <ka4inm at gmail.com>
>> Cc: Heathkit List <heathkit at mailman.qth.net>
>> Sent: Tue, Jun 28, 2016 8:49 pm
>> Subject: Re: [Heathkit] Heathkit AT-1 Meter
>>
>> Ron & Wayne
>>
>> The needle moves a bit when I jiggle the meter. When I blow on the needle
>> it move freely in the appropriate direction.
>>
>> Using a battery and series resistor the meter fully deflects from "noon"
>> to
>> the right. Reversing polarity the meter fully deflects from "noon" to the
>> left. The meter returns to "noon" quickly.
>>
>> There is no adjustment of any kind that I can see.
>>
>> I think the meter is original, it matches the pictures in the manual.
>>
>> Orientation - I'll verify tomorrow but I'm pretty sure the "noon" resting
>> point doesn't change.
>>
>> 73 Mark K3MSB
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>