XLogic Mic Amp Owner’s Manual
Appendix D – Calibration Information
The XLogic Mic Amp is factory calibrated and should only need calibration if a potentiometer or other component has been replaced or if it is suspected that there is a problem with calibration.
In all of the following instructions it is assumed that the top cover has been removed and that power has been applied. It is also assumed that unless otherwise specified, all switches are released and all potentiometers are at unity, minimum or indent position as appropriate. The required accuracy for each adjustment will be specified along with the target value.
All level and distortion measurements should be made with
Microphone Input
Equipment Required: | Calibrated audio oscillator and audio level meter | |
Test Signal: | 50Hz sinewave @ | |
Input and Output: | Oscillator to Microphone Input and Mic Out to the audio level meter | |
Unit Setup: | Set the Microphone Gain to ‘36dB’ | |
CMRR Trim |
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Adjustment: | On the 629601 card, adjust the following presets for minimum level (normally | |
| < |
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| Channel 1: | VR1 |
| Channel 2: | VR2 |
| Channel 3: | VR3 |
| Channel 4: | VR4 |
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