>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.
>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.
>or some other large 220-230V appliance.
>
>2. With the load switched off, use a high-resolution RMS AC DVM to
>measure the off-load voltage V1, just upstream of the ammeter.
>
>3. Wind up to full load, and then measure the current I and the on-load
>voltage V2 (which will of course be lower).
>
>4. R = (V1 - V2)/I.
>
>
>
>--
>73 from Ian G3SEK
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