The IE-45IM remembers calibration values for up to six different microphones, as well as calibration for individual line inputs and dual line inputs.  When you purchase an IE-45IM, whether it comes with a UMPC or you decide to use it with your notebook or other compur, the microphone(s) that you purchased with it will have already been calibrated to the unit before it leaves the factory and a factory "Certificate of Calibration" is included. If you intend to use a microphone you already own or purchase a microphone from Ivie at a later date, you will need to calibrate the microphone. "PERIODIC CALIBRATION" may be performed in the field if you own an SPL calibrator. 

for the appropriate calibration constant for the selected microphone.  Calibration requires that the microphone and IE-45IM Input Module be kept together as a complete instrument. The instrument will need to be re-calibrated if any of the above items are changed. 

The microphone (or microphones) that come with your IE-45IM from the factory are already calibrated and the calibration information is stored in the IE-45IM.  (A Calibration Certificate is shipped with the product with the appropriate calibration information).  For microphones that came from the factory with the IE-45IM you DO NOT NEED to complete the "INITIAL CALIBRATION" procedure below. If you intend to use a different microphone, YOU MUST follow the "INTIAL CALIBRATION" procedure below.

Step 1: With the microphone connected to your IE-45IM and the IE-45IM connected to your computing device, start the software and enter into the calibration mode by selecting the "File/Input Select/Calibrate" menu. 

Step 2: From the list shown, select which microphone you are going to calibrate. 

Step 3: The current dB SPL being measured by the IE‑45 will be displayed in real time in the "Current SPL" window.

Step 4: Place the calibrator (user supplied) over the microphone to be calibrated. The IE‑45 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. 

Step 6: Press "Calibrate". 

Step 7: Press "Done".

Step 1: With the microphone connected to your IE-45IM and the IE-45IM connected to your computing device, start the software and enter into the calibration mode by selecting the "File/Input Select/Calibrate" menu.

Step 2: From the list shown, select which microphone you are going to calibrate. 

Step 3: The current dB SPL being measured by the IE‑45 will be displayed in real time in the "Current SPL" window. 

Step 4: Using the Calibration Constant shown on the Calibration Certificate supplied with your IE-45IM, manually enter the Calibration Constant into the Calibrator SPL window and tap “Manual Set.” 

Step 5: Tap “OK”