FCS P4DMS Excalibur Manuel
P4DMS Excalibur Calibration Procedure (Main board FCS
P4DMS_EX_029_24)
Initial unity level setting:
1- Set Ratio, Threshold and Gain to zero and Blend to 100%
wet on both channels.
2- Set timing to RMS being sure no other timing switch is
engaged.
3- Make sure Feedback and External SC are not engaged.
4- Put compressor in SE I/O mode on both channels.
5- Apply a 0 dB / 1 kHz tone to the left TS input.
6- Measure the signal at the left TS output connector.
7- Adjust the Gain trim (R105) at the left VCA section so output
matches input.
8- Repeat for right channel using Gain trim (R101).
Balanced output unity level calibration:
1- Set Ratio, Threshold and Gain to zero on both channels.
2- Set timing to RMS being sure no other timing switch is
engaged.
3- Make sure Feedback and External SC are not engaged.
4- Make sure compressor is not in SE I/O mode.
5- Apply a +4 dB / 1 kHz tone to the left XLR input.
6- Measure the signal at the left XLR output connector.
7- Adjust the Gain trim at the left balanced I/O section located
in the left side of the compressor so output matches input.
The left gain trim is closest to the front panel.
8- Repeat for right channel using the gain trim closest to the
rear panel.
Detector calibration:
1- Make sure compressor is not linked by releasing the TPS
Link switch
2- Connect a DMM to the Cal and Zero test points on the left
channel of the main board.
3- Turn Ratio fully clockwise
4- 1 Apply a +4 dB / 1 kHz tone to the left XLR input.
5- Adjust the MONO Detector trim (R107) on the left
channel until it reads -120 mV DC.
6- Connect a DMM to the Cal and Zero test points on the
right channel of the main board.
7- Turn Ratio fully clockwise
8- 1 Apply a +4 dB / 1 kHz tone to the left XLR input.
9- Adjust the MONO Detector trim (R103) on the right
channel until it reads -120 mV DC.
10- Put the compressor in linked stereo mode by
depressing the TPS Link switch.
11- Connect a DMM to the Cal and Zero test points on the
left channel of the main board.
12- Turn Ratio fully clockwise on the left channel
13- 1 Apply a +4 dB / 1 kHz tone to the left XLR input.
14- Adjust the STEREO Detector trim (R106) on the left
channel until it reads -120 mV DC on the left Cal and
Zero test points.
15- 1 Apply a +4 dB / 1 kHz tone to the right XLR input.
16- Adjust the STEREO Detector trim (R102) on the right
channel until it reads -120 mV DC on the left Cal and
Zero test points.
*Note that these STEREO detector adjustments are
measured on the LEFT Cal and Zero testpoints since we
are doing stereo calibration which is controlled by the left
channel.*
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