Re: How to Use an HP 400D R.M.S. VTVM?

With meters "tied to ground" one can not measure differential voltages.
However Phil does not need to be cuntish about it.

As to his question:
"** So what voltage is OK to see on the neutral ?"<<

the answer is: it varies, but "several volts is not uncommon nor
acceptable, referenced to earth ground" is a common and accurate one.
Neutral or "earthy" in Britspeak is tied to ground or "earth" at ONE and
ONLY ONE place.

Using 220V balanced power in the US, or three phase power where
available, solves many problems and is the preferred power source if the
receiving equipment is properly designed or modified. Bi-phase power IS a
lot easier to use than quadrature (two phase, now obsolete in the US) or
three phase however. The latter require a lot of diodes and caps... They
do perform better though, though it's a moot point as in the US three
phase power is unobtanium in houses (unless you buy a rotary converter or
a gen set, q.f. the choo choo chiller so chic in alt-power circles).

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