Meyer Sound SIM 3 User's Guide Page 180

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174
CHAPTER 7
Using SIM 3
7.13. PERFORMING PROCEDURES
The Procedures menu in SIM 3 provides step-by-step processes to perform common tasks.
Click on a procedure, do each action in turn, and click for the next step. These windows stay
on top of the main SIM 3 screen, yet allow all settings and operation of the measurements to
be performed using the menus and tabs of the SIM 3 screen.
7.13.1. Mic SPL Calibration
You can calibrate microphone SPL for SIM 3 using either an external mic calibrator or a non-
calibrator method. The non-calibrator method is not yet described in SIM 3.
Figure 7.42. The Procedure menu dropdown
7.13.1.1. Using a Mic Calibrator
In order to make accurate SPL measurements, the channels to which each measurement
microphone is connected should be calibrated — setting each mic’s sensitivity to a known
SPL standard. Perform calibration in the Line Spectrum measurement using the Calibrate
Microphone button at the bottom of the Microphone or All view. Use the following
procedure:
1. Place a professional-grade mic calibrator at the mic element that is to be calibrated.
Please note that this calibrator is not part of SIM 3. Meyer Sound recommends the
Bruel & Kjaer Model 4231 Mic Calibrator. Most calibrators produce a signal of 94 dBSPL
at 1 kHz.
2. Select the microphone that is in the Live Branch.
3. Select View > Cursor Peak Track, wait until the measurement settles, and press the
Calibrate Microphone button.
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