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Power OK, SNR result "Poor"
The reasons for this are described in detail in the following section
where example measurements are also shown.
Repeated measurements due to poor SNR
Measurements are retried until the SNR is acceptable or the
maximum number of retries has been completed. The maximum
number of times each measurement will be retried due to poor
SNR can be set in the Preferences dialogue box, accessed from
the Options menu:
The default number of retries is 3. If the measurements are
consistently giving poor SNR figures you can reduce the number of
retries. However, it is better to follow the steps described below to
improve the measurement conditions. The better the measurement
the more accurate the results when calculating the filters for a
profile.
SPL meter is set on a low band
The following graph shows an impulse response obtained when a
Radio Shack SPL meter was set on the 60dB band. The SNR value
was "Poor":
SPL meter is set on a high band
The following graph shows an impulse response obtained when a
Radio Shack SPL meter was set on the 120dB band. The tail of the
response is generally noisy. The SNR value was acceptable but the
power was "Bad":
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