[Elecraft] K3 Voltmeter calibration ...

[Brian & Cyndi]

And the info below is what I found in Fred Cady's book on the K3. There 
is no other "calibration" for voltage in that book.

Until Don Wilhelm or Wayne Burdick chimes in,  I suspect there may not 
be any other adjustment available.

73,
Brian, W6FVI

On 11/24/2015 1:49 PM, Joe Subich, W4TV wrote:
>
> 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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