7-8 Performing the Measurement Model 831 Manual
FIGURE 7-6 Multiple Sound Level Parameters
Measurement Range
The measurement ranges over which the Model 831 meets
the standards, which depend upon the selected frequency
weighting, as shown in “Performance Specifications” on
page A-4. Measurements which include levels outside this
range should not be considered accurate. An overload
indication will appear when levels above the range appear.
However, the user should take care not to rely on
measurements whose levels are below the lower limit of the
specified range.
Overload/Under Range Levels
For further information on
determination of overload level and
under range levels, see “Sensitivity
Tab” on page 8-13.
As part of the calibration procedure, an overload level (dB
Peak) and under range sound pressure levels for A, C and Z-
weighting are determined for the instrument setup and
microphone/preamplifier combination being used. These are
displayed on the Microphone Page as shown in FIGURE 8-
12 “Sensitivity Tab” on page 8-14.
Overload Indication When a signal from the preamplifier exceeds the calibrated
input range of the Model 831, the Input Overload Icon will
appear at the top of the display.
Measurement Duration
Leq
Running SPL
Running Lpeak
Maximum Lpeak with data
and time of occurrence
Maximum RMS Value
with date and time of
occurrence
Minimum RMS Value
with date and time of
occurrence
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