Sound Level Meter Peak / PeakTC Hold

Controls: Options >> Sound Level Meter >> Peak, PeakTC
Macros: SPLpeak, SPLpeakTC

The Sound Level Meter continously monitors peak values, with and without response time constants, since the last Reset. The Peak and PeakTC buttons only select the display mode; you can toggle them on or off to see peaks or current SPL with no effect on the held values.

When the Peak button is active, the meter shows the maximum SPL value including any selected Weighting, but it does not include any Response effects.

PeakTC shows the maximum SPL value, including both Weighting and Response. Response settings with long Attack times reduce the maximum SPL measured on transients, so PeakTC will be lower than Peak in many cases.

If both Peak and PeakTC are off, the display shows the current instantaneous Response output with full dynamics.

Peak and PeakTC maxima are computed and held separately, so you can view either of these or the instantaneous display at any time. The held values will always be updated whether you are viewing them or not. Reset always operates on both held values.

Note that Peak and PeakTC values are maintained separately for each Channel, but they are only updated when a channel is selected for SPL display. You can switch between channels and view peak SPLs from the last time that channel was shown, but you can't see what peaks may have happened in the meantime. All channels are cleared on Reset.

Peak and PeakTC measurements may also be made on .DQA file data recorded on a calibrated system.

Macro Notes:

SPLpeak=1 activates Peak display mode, SPLpeak=0 returns to instantaneous SPL display, and SPLpeak=x toggles between these.

Similarly, SPLpeakTC=1 activates PeakTC display mode, SPLpeakTC=0 returns to instantaneous SPL display, and SPLpeakTC=x toggles between these.