Max. Hold "Peak" Measurements; Use Of The L Qlsel Conversion Table - BRUEL & KJAER 2221 Instruction Manual

3. To begin measurement press RESET.
The display will indicate the maximum Y'Fast" or "Slow" RMS value occuring after the
instrument has been last reset automatically or manually. See note section 3.5.6.
Note that the measuring ranges in Max. Hold "Fast" or "Slow" modes are as follows:
40-85 dB(A)
60-105 dB(A)
80-125 dB(A)
100-145 dB(A)
Note:
If the captured level is close to the bottom of the chosen range the display may alternate
between_Jwo values (e.g. between 61,4 dB and 61,8 dB in the range 60-105 dB). This is
caused by the quantitative nature of the dose counter. The correct value is between the
two readings shown.
This phenomenon only occurs when measuring levels close to the low end of the range.
For an easier reading change to a lower range.
The decay rate <0 ,05 dB/sec of the Max. Hold function allows time to write down the
displayed value.
Setting MODE to "Pause" freezes the display, but the Max. Hold circuit is still active. A
higher value which occurs while in "Pause" will be displayed when the instrument is set
again to "Run".
3.5.6. Max. Hold "Peak" Measurements
The procedure is identical to that for Max. Hold "Fast" or "Slow" measurements except
that the FUNCTION selector has to be set to "Peak".
The measuring ranges are as follows (See note above):
55-88 dB(Lin.)
60-108 dB(Lin.)
80-128 dB(Lin.)
100-148 dB(Lin.)
Note:
The Types 2221 and 2222 have been especially constructed to allow simple modification
of Max. Hold "Fast" to Max. Hold "Slow" or vice-versa, and Max. Hold "Peak" with A
weighting to Max. Hold "Peak" with Linear (flat) weighting. For further details contact
your local B & K representative.
3.5.7. Use of the LeqlSEL Conversion Table
This is printed on the reverse side of the Sound Level Meter and may be employed as
follows:
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