>rlm wrote:
>>
>>
>>>rlm wrote:
>>>>** Ian -- Does the PSU Designer program have an entry for Mains
>>>>Resistance?.
>>>>
>>>Well, kind-of. It has a little calculator where you can work out the
>>>effective secondary resistance, which includes the real secondary
>>>resistance plus a contribution from the primary resistance plus the
>>>mains resistance.
>>>
>>*** sounds good but if the transformer core is not Hipersil®, there is
>>an additional loss due to flux coupling.
>>
>That's not something PSU Designer can handle, but it's usually not a
>major source of error.
*** Peter W. Dahl told me that in non-Hipersil® transformers, flux loss
and R loss are about equal.
>If you want to quantify it, you'd have to go
>beyond PSU Designer's simplified 'plug-and-play' approach. You'd have to
>make some loss and leakage inductance measurements on the transformer,
>and step up to a full SPICE model.
>
>>>If you have a figure for mains resistance, you can add it to the primary
>>>resistance.
>>>
>>>>How does one measure this quantity? Thanks.
>>>
>>>1. Connect an accurate AC ammeter between the mains supply and your
>>>biggest amp,
>>
>>
>>*** Only those amplifiers that use a resonant-choke filter read mains
>>current correctly on a garden-viriety AC ampmeter.
>>
>Sorry, I should have specified an RMS AC ammeter as well as an RMS
>voltmeter.
>
*** ok
> ...
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