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 audio-band 20Hz to 20kHz filters unless otherwise
specified.
Microphone Input
Equipment Required:
Calibrated audio oscillator and audio level meter
Test Signal:
50Hz sinewave @ –12dBu, common mode
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
Adjustment:
On the 629601 card, adjust the following presets for minimum level (normally
< –40dBu):
Channel 1:
VR1
Channel 2:
VR2
Channel 3:
VR3
Channel 4:
VR4
XLogic Mic Amp Owner’s Manual
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Summary of Contents for 82S6XL020E
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