Chapter 8: Audio Module, Rev 1.1
Figure 8-29 - Microphone Test Results
The RMS value is the calculated average noise for 1 second of audio data.
NOTE: Only RMS values for Audio Output channels are displayed in the log window.
The RMS Microphone Test value is the number in parentheses “( )”. It is the RMS for the
entire data record (1 second) during the microphone test.
The RMS sub-Interval value is the first number computed for a successful test.
NOTE: In Audio Test mode the RMS values scrolling in the Log Window are for output
channels. During a successful microphone self test the RMS values for each input
channel is displayed in the Log Window.
A successful test should show results similar to the following:
RMS Value (for entire
1 sec.)
RMS Sub-Interval Value
(for buzzer)
RMS Microphone test
Value (for entire 1
sec. test)
Figure 8-30 - Microphone Test Results
NOTE: A chirp not detected on channel X during a manually activated audio test will be
displayed even if there is no microphone installed for that channel
. This is a result of each
channel being tested for a microphone in this mode only; This will not display an error
during the audio testing while in record mode.
5. Make note of the RMS Sub-Interval Value and RMS Microphone Test Value
displayed when a chirp is detected;
For example for the audio input channels:
Mike 1 test – chirp detected on channel 1 – 843.978 (157.183)
Mike 1 test – chirp detected on channel 2 – 949.844 (181.907)
Mike 1 test – chirp detected on channel 3 – 729.637 (144.812)
Note! If a manually activated test was aborted or a microphone is not detected,
the test must be repeated. The values displayed for each test will vary
depending on the amount of noise on the bridge at the time the audio test was
performed
6. Repeat steps 2 through 5 for microphone 2 test. This will activate all Buzzer 2
connections on the Audio Module. Results similar to Test 1 should be observed;
Mike 2 test – chirp detected on channel 1 – 863.978 (167.183)
Mike 2 test – chirp detected on channel 2 – 939.844 (171.907)
Mike 2 test – chirp detected on channel 3 – 759.637 (149.812)
VDR-100G3/G3S Installation Manual 06/10/2008
8-33
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