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<br />~~ <br />f,. <br />~~`- <br />"~; <br />-.;. <br />~~. k <br />~~N <br />:~. ~, <br />~- <br />a b <br />Fieure 5.6 Instanlel Standard Transducer (a) and Standard <br />Transducer with Optional Leveling Plate (b). <br />c. Transducer Calibration Requirements <br />The geophone sensors inside Instantcl's transducers must be calibrated annually by Instantel or an <br />authorized Instantel service facility. Contact your dealer for further information. <br />5.2.2. Microphone <br />The microphone mcazures air pressure. Instantel offers two types, Linear "L" (standard) and "A" <br />Weight (optional). Hoth come with a three foot (one meter) microphone mounting stand. <br />• a. Measurement Scales <br />The B1aztMate III supports two sound pressure measttremcnt scales: Lineaz'Y." end "A" Weight. <br />(1) Linear "L" _ <br />Linear meazurement is generally used to measure the effect of low frequency air pressure on <br />buildings. The linear scale records sound pressure without modification in the 2 to 300 Hz range. <br />Meazurement units may be in absolute, Pascal, or relative dB scales. <br />(2) Weight <br />"A" Weight measures noise levels people may consider an annoyance. The signal is then convened <br />to root mean square (RMS). Units are measured using the decibel scale, dB(A). <br />b. Microphone Calibration Requirements <br />Instantel's microphone must be calibrated annually by Instantel or an authorized Instantel service <br />facility. Contact your dealer for further information. <br />5.3. Sensorcheck® <br />Sensorcheck performs a two stage test on the B1astMate III and its sensors. In the first stage, the <br />program displays the B1astMate III serial number, software version, the total amount of memory <br />installed in the BlaztMate III, the total amount of memory available to store events, and the number <br />of events presently stored in memory. The second stage tests each geophone within Instantel's <br />transducer and the microphone operation. The program also tests the operation of the BlaztMate III <br />itself and the sensor connecting cables. Pass or fail results appear on [he display. See the Basic <br />• Reference chapter of this manual to choose when Sensorcheck operates automatically. <br />B1aztMate III Operator Manual <br />