Ivie Technologies, Inc.

The iPAQ can remember the calibration values for up to six different microphones. If you purchase the IE-33 complete (with an iPAQ), the microphone will have already been calibrated to the unit before it leaves the factory and a factory "Certificate of Calibration" is included. If you purchase the IE-33J (jacket only) to use with your own iPAQ, you will need to calibrate the microphone. "PERIODIC CALIBRATION" may be performed in the field if you own an SPL calibrator.

Whichever microphone(s) is employed, it is calibrated to the Ivie IE-33 Jacket (IE-33J) and not to the iPAQ Pocket PC. The iPAQ simply remembers and applies the calibration value of the microphone/jacket combination to the calculations of IE-33 SPL measurements. Calibration requires that the microphone, jacket, and iPAQ be kept together as a complete instrument. The instrument will need to be recalibrated if any of the above items are changed.

If you purchased a complete IE-33 including an iPAQ from Ivie, the calibration number has been entered into your iPAQ and you DO NOT NEED to complete the "INITIAL CALIBRATION" procedure below. If you have supplied your own iPAQ, YOU MUST follow the "INTIAL CALIBRATION" procedure below.

PERIODIC CALIBRATION

Step 1: With the iPAQ inserted into the IE-33J (jacket), enter into the calibration mode by selecting the "File/Input Select/Calibrate" menu.

Step 2: Select which microphone you are going to calibrate to the IE-33J.

Step 3: The current dB SPL being measured by the IE-33 will be displayed in real time in the "Current dB SPL" window.

Step 4: Place the calibrator (user supplied) over the microphone to be calibrated. The IE-33 SPL Meter is automatically set to FAST response and FLAT weighting.

Step 5: Enter the desired calibration level into the "Calibrator dB SPL" window. This would include any allowances for altitude and barometric pressure should your calibration equipment provide these.

INITIAL CALIBRATION

Step 1: Remove the iPAQ from the IE-33J (jacket). The iPAQ MUST NOT BE CONNECTED to the IE-33J in any way.

Step 2: Enter into the calibration mode by selecting the "File/Input Select/Calibrate" menu.

Step 3: Select which microphone you are going to calibrate to the IE-33J.

Step 4: Enter the calibration value from the "Certificate of Calibration" (factory supplied) into the "Calibrator dB SPL" window.

Step 7: Place the iPAQ into the IE-33J (jacket) and you are now ready to use the calibrated SPL functions of the IE-33.

Note: for factory calibration, the Calibration Constant (CC) value should match the CC value on your factory "Certificate of Calibration". If you perform your own calibration the number may change and should be recorded.