Kimo DS300 User Manual

Contents

Kimo DS300 User Manual Manual pdf 36 page image

11 Running information11.1 Instantaneous overload – percentage• Instantaneous overload: in condition of overload of input stages, a pictogram appears. It is displayed fleetinglyduring measurement and remains displayed during the reading of results.• Percentage: this information can be necessary for a measurement in the medium and long term whenthe overload indicator is displayed. Its presence does not provide information about the occurrence ofoverload but the percentage calculation provides a level of alert on measured and displayed levels by theinstrument.11.2 Power supplyThis pictogram provides information on the remaining power. In case of low battery, less than one de bar on thepictogram, the instrument stops the measurement and turns off saving the current results.11.3 Over range measurementIn measurement conditions out of the dynamic range, measured values are not displayed and are et are replaced by signs:• +++,+: if the value is higher than the top of the range: 40-120 - the top of the range stays opened 60-140• ---,-: if the value is lower than the down of the range: 40 for the range 40-120 or 40-140 and 60 for the range 60-140.11.4 Detection and counting of peak pressure levels 135-137-140 dBDetection principle: the detection of peak pressure levels is made at the frequency of instrument sampling, about 23 kHz.So, theoretically, it is possible to detect several thousand of values, maximum 23 000 values per seconds.During measurement: the instrument records the temporal evolution on an elementary duration programmable from 1 s to60 s (usually 1 s). it displays and keeps in memory the maximum peak pressure level reached during each duration ofelementary integration.Results: the reading gives for the total measurement duration:• on the instrument: the maximum peak pressure level reached during the measurement• with the software: the maximum peak pressure level reached during the measurement and the maximum peakpressure level reached for each duration of elementary integration (usually 1 s).Counting: only for 40-140dB and 60-140 dB measuring ranges. For 40-120 dB range, counters display 0. The highervalue being 123,5 dB peak.It is limited to the number of elementary periods whom maximum peak pressure level exceeded reference values 135-137-140 dBC (Z).This principle has the advantage to consider all the values related to the sampling rate (23 000/s possible) and simplifiesthe results reading and keeps the preventive and regulatory nature of this control.The example on the right shows that during measurement, the dosimeter had recorded:• 2 elementary periods whose maximum peak pressure level has exceeded 140 dB• 4 elementary periods whose maximum peak pressure level has exceeded 137 dB• 9 elementary periods whose maximum peak pressure level has exceeded 135 dBSo these results show that during 9 DI elementary periods, the maximum peak pressure level hasexceeded 135 dB, included 4 for 137 dB and 2 for 140 dB.36E4V10 %2 1404 1379 135