[Elecraft] K3 Voltmeter calibration ...

[Joe Subich, W4TV]

I've already set ADC REF as documented in the manual.  The Voltage is
still off.  There should be a procedure to set the voltage as there was
when I assembled this K3 (s/n 1450) several years ago.  Unfortunately,
I can no longer find it in the current Owner's Manual or Assembly
Manual.

73,

   ... Joe, W4TV


On 11/24/2015 4:01 PM, Brian & Cyndi wrote:
> Joe, if you just want to make the K3's voltmeter match your "known good"
> reference meter, you need to adjust the "ADC REF" value.
>
> Go into the CONFIG menu, set Tech mode "On", then go to the "ADC REF"
> setting.  Note what it is before changing anything, in case this
> adjustment affects anything else adversely.  Adjust the ADC REF value to
> cause the voltmeter display to read the value you want. You will need to
> go in and out of the menu display to see the results (kinda clumsy).
>
> Again, this adjustment may affect other measurements, so an accurate K3
> voltmeter may not be that important after all.
>
> 73,
> Brian, W6FVI
>
> On 11/24/2015 9:32 AM, Joe Subich, W4TV wrote:
>>
>> It matters not if there is a series diode.  The Voltmeter should
>> be calibrated to the input power.  I remember that being the case
>> when I assembled my first K3.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 11/24/2015 11:02 AM, Michael Blake wrote:
>>> Joe, is there not at least one diode junction or solid state switch
>>> in series with the input power inside the K3?
>>>
>>> Michael Blake - K9JRI
>>>
>>>
>>>
>>>
>>>> On Nov 24, 2015, at 10:06 AM, Joe Subich, W4TV <lists at subich.com>
>>>> wrote:
>>>>
>>>>
>>>> OK, I'm sure I am overlooking something simple but I can not find
>>>> (or remember) how to calibrate the voltage display in the K3.
>>>>
>>>> I had to repair one of my Astron RS-35A power supplies for the first
>>>> time in 30 years (one of the diodes shorted) and when I put it back on
>>>> line I decided to double check the K3 Volts display against the actual
>>>> output of the supply.  The K3 is reading about 0.2V less than the
>>>> supply voltage.
>>>>
>>>> I've been over both the K3 Owner's Manual and the K3 Assembly
>>>> Instructions but can't find any reference to calibrating the voltage
>>>> display.
>>>>
>>>> 73,
>>>>
>>>>    ... Joe, W4TV
>>>>
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>
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