[Hammarlund] HX-500 trials

[Rodger Singley]

The resistance of the primary winding is so low that the change in resistance due to a few shorted turns would be practically impossible to measure even with the good and defective transformers side by side measured with the same setup.  Measuring the unloaded current draw, Q, or turns ratio would be more unlikely to reveal an issue and if there is a significant number of shorted turns on the primary current draw will go up quite a bit.  Of course any shorted turns on the secondary will quickly become obvious since this is the equivalent of a shorted secondary winding with resulting very high current draw until something behaves like a fuse.

As others have noted I am leaning towards a calibration error with the OP's meter.  It would be good to check the meter against another instrument, a known reference voltage (high accuracy zener references are pretty cheap now, or at least against a fresh carbon zinc C or D cell to check basic meter calibration. 

Rodger WQ9E


-------- Original Message --------
> From: Brian Harris via Hammarlund <hammarlund at mailman.qth.net>
> Sent: Wednesday, April 27, 2016 7:44 PM
> To: "Richard W. Solomon" <w1ksz at earthlink.net>
> Subject: Re: [Hammarlund] HX-500 trials
> 
> I think he said he was running 109vac in. I think he may have a few shorted primary turns so I will measure the primary resistance of mine for a reference point when I get back to Arkansas next week. Perhaps other owners might do the same.  
> Wa5uek
> Sent from my iPhone
> 
>