3-10 Summary of Displays and Icons Model 831 Manual
When using a microphone having a sensitivity of 50 mV/Pa,
the input overload will occur approximately as shown in
Table 3-5.
OBA Under Range Icon
When the signal from the preamplifier drops to the point
where the noise level of the instrument and the preamplifier
influence the measurement, an under range condition exists.
When all filters of the OBA are “under range” the OBA
Under Range Icon appears.
As long as this under range condition exists, the icon will
flash. When the measured OBA levels no longer produces
an under range condition, the icon will be removed from the
display.
Like the SLM, when a measured OBA parameter is in an
under range condition, it's numeric display will appear in
grey rather than the usual black, as shown Figure 3-8.
FIGURE 3-8 OBA Under Range Display
Measurement Status
Reset Icon
The Reset Icon indicates that a reset has occurred.
Input Gain, dB OBA Range Overload Level, dB
0 Normal 143
20 Normal 123
0 Low 110
20 Low 90
Table 3-5 OBA Overload Levels
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