it is turned on, is reset, or the PAUSE key is pressed. Wait until the sound level has stabilized before entering the run mode.
Always remember to press RUN.
Press PAUSE before pressing PRINT. If in the run mode, the data printed at the beginning of the printout will not agree with the data at the end.
Considerations of Measurement and Accuracy
An integrating meter such as the
Microphone location generally has the greatest effect on the accuracy of any noise measuring instrument. The correct placement of the
Threshold discontinuity can cause notable differences in readings on various meters if the noise level is near the threshold. Since the instrument assumes that noise even slightly below the threshold is absolute quiet, that noise level is not accumulated into the results while a noise level just slightly higher is accumulated. This is most noticeable in the readings of dose if the threshold is the same as the criterion level.
Peak noise levels greater than the range of the instrument are "clipped" and act as if they were at the maximum level of either 146 dB on the 50 dB range or 126 dB on the 30 dB range.
Minimum noise levels are either at the bottom of the range or at the noise floor of the instrument. For readings which do not have a lower threshold, the accumulated noise will be at these levels.
Crest factor is an almost meaningless term for instruments with crest factors in excess of 30 dB. The
ACCESSORIES
Model
Refer to page 22 on how to use the windscreen with the
Model MB-1 Microphone Bracket
Refer to page 20.
Cables
Tripods
page 21. Quest supplies two models of tripods for use with the
BX-9 Battery Change Adapter
To preserve stored data in the