"David Lying Jones "
Technically speaking, the True RMS function is more important.
Without True RMS, you can't measure all AC signals as accurately.
** That is more D L Jerkoff self opinionated bollocks.
There is nothing inherently more "accurate" about measuring / computing the
rms value of an AC wave.
Non " rms " multimeters respond to the "average rectified value" of the AC
wave - scaled up to display the exact rms value with sine wave signals. As
the vast majority of AC voltages and currents encountered in ELECTRICAL work
have close to sine wave shape - this is perfectly good method.
The peak value and /or the average rectified value of a non-sine AC wave
are more likely to be important to know than the more obscure " true rms"
value. If the wave shape matters, then you need a scope to look at it.
PLUS - the "true rms" function of budget multimeters has *woefully narrow*
measurement bandwidth ( often < 500Hz ) which * INHERENTLY * spoils the
supposed accuracy of all readings of non sine wave forms - which typically
contain harmonics to well beyond the accurate measurement range of such
multimeters.
But lack of autoranging does not compromise the actual meters performance.
** It sure as hell compromises the operator in most service situations.
....... Phil
