54 Micromate Operator Manual – 721U0201 Revision 6
11.1.2. Microphone Type
This menu allows you to select the type of microphone you will be using. The Linear microphone
(Part No. 721A0201 ) is used to record air overpressure while the Sound Level microphone (Part
No. 721A2301) is used to record A or C weighted sound with a Fast or Slow response. The Linear
microphone is generally used to monitor blasting and construction activities where air
overpressure is a concern. The Sound Level microphone is typically used to record noise levels that
could affect people.
11.1.3. Record Mode
The Record Mode determines how the Micromate will record event data. The Micromate offers
four different record modes. These modes are Waveform, Waveform Manual, Histogram and
Histogram Combo. When the Micromate is placed into monitor mode it will display the current
record mode along with the record time and or interval length and associated trigger levels. Once
an event or interval has been completed the peak vibration and overpressure as well as the
associated zero crossing frequencies will be displayed. These record modes are described in detail
below.
Waveform Mode: The Micromate will continuously monitor the signals being received from the
geophone and or microphone sensor(s). Once one of these signals exceeds the preset trigger level
the Micromate will start recording the data. Data will continue to be saved until the preset number
of seconds of data has been recorded. The event will then be closed and the peak vibration and
overpressure as well as the zero crossing frequencies will be written to the display while the
Micromate goes back into monitor mode. The Micromate will monitor the input signals until the
trigger level is exceeded again and repeat the process.
Sample Display for Waveform Monitoring
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