[Elecraft] Re: voltage

[Don Wilhelm]

Gentlemen,

But the question really is:
What is the 'true' voltage.
IMHO, the true voltage is the voltage that is present inside the K2,
For others, the true voltage might be the voltage applied to the K2.
The stock K2 will indicate the actual voltage inside the K2, but by 
adjusting the resistor, it can be skewed to indicate the power supply 
voltage - however, that will skew the readings if one attempts to use 
the internal voltmeter to read voltages with the probe - the readings 
will be skewed by the amount of 'correction',
Each to his own choice.

73,
Don W3FPR

Chris Kantarjiev wrote:
> Chuck NI0C wrote:
>
>   
>> K6DBG wrote: 
>> "I adjusted mine so the display voltmeter matches the measured
>> voltage past the diode."
>>
>> That's an interesting idea; however if you ever go back to assembly 
>> steps using the internal DVM, you would have to compensate for the
>> offset you put in (assuming it is a pure offset and no gain factor is
>> involved), or use an external DVM for those steps.  
>>
>> I prefer having my internal DVM reading the true voltage. 
>>     
>
> I think you misunderstand - the adjustment is specifically to have
> the display show the true voltage.
>
> The K2 uses a voltage divider (R9, R10) into an op amp (U3B) to
> determine the displayed voltage; the resistors used are "only" 1%,
> so there is some inaccuracy in the resulting "V SENSE". Changing
> R10 to a trimpot allows me to set the bridge accurately.
>
> 73,
> chris
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