EDWARDS SYSTEMS TECHNOLOGY EST2 Operation Manual page 75

Push to talk switch (PTT)
Microphone handset
VU meter
Emergency tone select switch
Fire tone switch
Figure 3-12: SAN-MIC II and emergency tone select positions
EST2 System Operations Manual
Emergency tone select positions
Slip-in
label
protector
INST053.CDR
In the normal state, the SAN-MIC II generates a supervisory pulse
tone for supervision of the audio wiring and circuitry.
Switches
The Fire Tone switch sends the jumper-defined alarm tone to the
module output terminals as long as the Emergency Tone Select
switch is in the normal position. The Auxiliary Input overrides the
Fire Tone. The Speaker Select relay closes upon the activation of
the Fire Tone switch.
The Emergency Tone Select switch sends the jumper-defined
emergency tone 1 or emergency tone 2 to the module output
terminals as long as the microphone is not in active operation. The
auxiliary input overrides the emergency tones. The activation of
the Emergency Tone switch also closes the speaker select relay.
The Microphone PTT sends the microphone output to the module
output terminals, and overrides all tone generators. The auxiliary
input overrides the all microphone tones. The activation of the
microphone PTT closes the speaker select relay.
VU meter
The VU meter is a row of LEDs that form a bar graph to indicate
the input level from the microphone. The amplitude of your voice
determines the microphone's input level. If the bar graph does not
light up when you talk, you may not be talking loud enough. If the
bar graph runs all the way to the left, you are talking too loud. The
ideal indication on the VU meter is a bar graph that runs to the
middle.
Operating remote devices
Emergency tone 1
Normal
Emergency tone 2
*
3.17