Solid State Logic 82S6XL010D owner manual Appendix D Calibration Information, DC Calibration

Appendix

Appendix D - Calibration Information

The XLogic Multi Channel compressor 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 lid 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.

DC Calibration

Side Chain Trim Calibration
Equipment Required:		Digital Volt Meter
Unit Setup:	1.	Ensure that all front panel switches are off and all controls are set fully anti-
		clockwise, except for the Side Chain Trim pots which should be set to indent.
	2.	Reference the DVM to 0VA at TP42 on the lower card (629606).
Adjustment:	1.	Measuring TP44 on the lower card (629606) – remove PL2 connector to access the
		test point – adjust VR8 (AutoFade offset) for 0mV ±0.5mV. Reconnect PL2
		between the upper and lower cards.
	2.	Set the Left/Right S-Chain Trim on the front panel to indent. Measuring TP3 on
		the upper card (629607), adjust VR6 on the upper card for –0.45V ±10mV.
	3.	Set the Centre S-Chain Trim on the front panel to indent. Measuring TP4 on the
		upper card (629607), adjust VR7 on the upper card for –0.45V ±10mV.
	4.	Set front panel pot, Surround S-Chain Trim, to indent. Measuring TP43 on the
		lower card (629606), adjust VR7 on the lower card for –0.45V ±10mV.
	5.	Set front panel pot, LFE S-Chain Trim, to indent. Measuring TP39 on the lower
		card (629606), adjust VR6 on the lower card for –0.45V ±10mV.
Side Chain Gain Adjustment
Unit Setup:		Switch the Master Fader IN. Measure TP5 on the upper card (629607) and adjust
		the Master Fader on the front panel for –2.00V ±1mV (which equates to 40dB of
		attenuation).
Adjustment:	1.	Measuring TP47 on the lower card (629606), adjust VR10 for +2.00V ±1mV.
	2.	Measuring TP45 on the lower card (629606), adjust VR9 for +2.00V ±1mV.
	3.	Release the Master Fader IN switch.

Control Voltage Breakthrough Null

Unit Setup:		Select SIDE CHAIN SUM and press both compressor IN switches. Turn both
		front panel THRESHOLD pots fully anti-clockwise.
Adjustment:	1.	Measuring TP4 on the lower card (629606), adjust VR11 for 0V ±10mV. Turn the
		front panel Main/Stereo A Threshold pot fully clockwise – check that the
		measurement remains within 10mV of 0V and re-adjust if necessary.
	2.	Turn the front panel Main/Stereo A Threshold pot fully anti-clockwise.
		Measuring TP6 on the lower card (629606), adjust VR12 for 0V ±10mV.
	3.	Turn the front panel LFE/Stereo B Threshold pot fully clockwise – check that the
		measurement remains within 10mV of 0V and re-adjust if necessary.
	4.	Turn the front panel LFE/Stereo B Threshold pot fully anti-clockwise. De-select
		the compressor IN switches and the SIDE CHAIN SUM switch.

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