Product manual

EAP01 - Product Manual
5.3 Configuring the Microphone Audio Parameters
5.3.1 Microphone Input Gain
VAR4/12/20 Menu: ConfigurationÆSystemÆRouterÆInputsÆMic/Line
Æ<I/P #nn – input name>ÆFire MicrophoneÆAudioÆGainÆPreAmp
DAU/ACU/VAR8/VAR8-ACU Menu: ConfigurationÆSystemÆRouterÆInputsÆMic/Line
Æ<I/P #nn – input name>ÆFire MicrophoneÆAudioÆGainÆInput
Possible values: –63dB to 0dB (1dB steps)
System default configuration: –14 dB on VAR4/VAR12/VAR20
–20 dB on ACU and VAR8-ACU
The input gain of each audio input should normally be set so that all inputs are balanced, and give the same
output level on any one output. The output gains are then balanced to give the same gain on all outputs.
1. Initially ensure that the microphone input gain is set to its default value of:
• VAR4/12/20: –14 dB
• DAU/ACU/VAR8/VAR8-ACU: –20 dB
2. Ensure that the line sensitivity (Sens.) is set to its default option, which is ‘Line’.
This setting is only available in the VAR4/12/20 Router.
5.3.2 Microphone Surveillance Tone Detection
Menu: ConfigurationÆSystemÆRouterÆInputsÆMic/LineÆ<I/P #nn – input name>
ÆFire MicrophoneÆAudioÆSurv
Possible values: –40dB to 0dB (1dB steps)
System default configuration: ‘–40dB’
If this surveillance is enabled, then in the absence of a surveillance tone, an Input Audio fault will be raised
and logged. This would indicate that the microphone audio connection is broken, or is a poor connection.
For BS5839 compliance the input surveillance MUST be enabled on Fire Microphone inputs.
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Issue: 02 complete, approved
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