X-Nico

8 unusual facts about root mean square


Audio analyzer

Level may also be conditioned as a peak measurement or an RMS measurement.

Dbx, Inc.

The most important inventions of David Blackmer and dbx are the dbx voltage controlled amplifier or VCA and the dbx RMS detector.

IC power-supply pin

Lower case letters and subscripts are used to refer to these signal levels at the terminals, either peak-to-peak or rms as required.

NAD Electronics

NAD focuses on the concept of "effective power" and its amplifiers make claims to deliver generous headroom, meaning that they may be able to deliver dynamic power bursts far in excess of their rated RMS power.

Peak-reading

A peak-reading electrical instrument or meter is one which measures the peak value of a waveform, rather than its mean value or RMS value.

Power supply rejection ratio

But testing is not confined to DC (zero frequency); often an operational amplifier will also have its PSRR given at various frequencies (in which case the ratio is one of RMS amplitudes of sinewaves present at a power supply compared with the output, with gain taken into account).

Root mean square

For a discussion of audio power measurements and their shortcomings, see Audio power.

Speakon connector

Speakon connectors are rated for 30 A RMS continuous current, higher than 1/4-inch TS phone connectors, two-pole twist lock, and XLR connectors for loudspeakers.


Extra-low voltage

The International Electrotechnical Commission and its member organizations define an ELV circuit as one in which the electrical potential of any conductor against earth (ground) is not more than either 25 volts RMS (35 volts peak) for alternating current, or ripple-free 60 volts for direct current under dry conditions.

VU meter

The mass of the needle causes a relatively slow response, which in effect integrates the signal, with a rise time of 300 ms. 0 VU is equal to +4 dBu, or 1.228 volts RMS across a 600 ohm load.


see also

PAPR

Peak-to-Average Power Ratio, the peak divided by the Root mean square (RMS) of the waveform