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<br />• <br />~. <br />e,"~';~ <br />.t:~. <br />~'~-= ~ : <br />a b <br />Figure 5.6lnstantel Standard Transducer (a) and Standard <br />Transducer kith Optional Levelling Plate (b). <br />c. Transducer Calibration Requirements <br />The geophone sensors inside Instantel's aansducezs must be calibrated annually by Instan[el or an <br />authorized Instantel service facility. Contact your dealer for funkier information. <br />5.2.2. Microphone <br />The microphone measures av pressure. Instance] offers two types, Linear "L" (standard) and "A" <br />Weight (optional). Both come with a three foot (one me[er) microphone mounting stand. <br />• a. Measurement Scales <br />The Blastlvtate III suppons two sound pressure meazurement scales: Linear "L" and "A" Weight. <br />(S) Linear "L" <br />Lineaz measurement 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 />Measurement 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 convetud <br />to root mean square (RMS). Unite are measured using the decibel scale, dB(A). <br />b. Microphone Calibration Requirements <br />Instan[el's microphone must be calibrated annually by Instantel or an authorized Instantel service <br />facility. Contact your dealer for funkier information. <br />5.3. Sensorcheck® <br />Sensorcheck performs a two stage test on the Blazt~~Iate Tii and its sensors. In the fvst stage, the <br />program displays the Blast:Mate III serial number, software version, the total amount of memory <br />installed in the Blazt?v9ate 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 Ins[antel's <br />transducer and the microphone operation. The program also tests the operation of the Blastvlate III <br />itself and the sensor connecting cables. Pass or fail results appeaz on the display. See the Bazic <br />• Reference chapter of this manual to choose when Sensorcheck operates automatically. <br />5~ B1astMate III Operator Manual <br />