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NOTE
If the level is less than the threshold for part of the minute the average can be less
than the threshold.
If no levels above the threshold level are measured, the level is set to 00 dB.
The first + in the graph is 50 dB and the next is 60 dB, etc.
Each - is 2 dB.
105 dB is the average of the 5 levels combined with a 5 dB exchange rate.
Each line on a 1-minute histogram is 5 minutes of data.
If a 3-, 5-, or 10-minute histogram is selected each line would be 15, 30, or 60 minutes long with 5
or 6 levels per line.
It is possible to change the time base on the histogram in the middle of a printout (see Figure 14
for example and page 31 for details).
If only TEXT was selected on the internal switches, the graph portion would be omitted. If
GRAPH is selected, the time and graph portion is printed. This is useful for 40-column printers.
Statistical Distributions
Four separate statistical distributions are accumulated. The % TIME shows the percent time at
each level. The % DOSE shows the accumulated dose at each level. Both of the percentages depend on the
time constant and the exchange rate so two separated distributions are accumulated (see Figure 15).
.03 is the percent of run time at 50 dB.
2.58 is the percent time at 51 dB, etc.
Each + is 10% starting at 0%.
Each - is 2%.