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Page E-4
X-Rack Owner’s Manual
E.5 Calibration Information
T
he X-Rack Line Return module is factory calibrated and should only need calibration if a potentiometer
o
r other component has been replaced or if it is suspected that there is a problem with calibration.
I
n each of the following instructions it is assumed that an X-Rack Master module is also fitted to the
X
-Rack and that power has been applied. It is also assumed that unless otherwise specified, all switches
a
re released and all front panel potentiometers are at unity or minimum position as appropriate. The
r
equired accuracy for each adjustment will be specified along with the target value. All level and
d
istortion measurements should be made with audio-band 20Hz to 20kHz filters unless otherwise
s
pecified.
These presets are not accessible from the top of the unit, access to the right-hand side of the module will
be required for adjustment.
E.5.1 Line Input
Equipment Required: Calibrated audio oscillator and audio level meter
Test Signal: 1kHz sinewave @ 0dBu
Input and Output: Oscillator to Line Input
Output to the audio level meter from Master module Mix Bus Insert Send
(use Left or Right as instructed below)
Unit Setup: 1. Set each Level control to indent (0dB).
2. Set each Pan control Left.
E.5.2 Line 1
Adjustment: 1. Measure Insert Send Left and adjust VR9 for 0dBu ±0.1dB.
2. Set the Pan control to Centre and adjust VR14 for –4.5dBu ± 0.1dB.
3. Measure Insert Send Right and adjust VR13 for –4.5dBu ± 0.1dB.
4. Repeat each step until correct.
E.5.3 Line 2
Adjustment: 1. Measure Insert Send Left and adjust VR10 for 0dBu ± 0.1dB.
2. Set the Pan control to Centre and adjust VR16 for –4.5dBu ± 0.1dB.
3. Measure Insert Send Right and adjust VR15 for –4.5dBu ± 0.1dB.
4. Repeat each step until correct.
E.5.4 Line 3
Adjustment: 1. Measure Insert Send Left and adjust VR11 for 0dBu ± 0.1dB.
2. Set the Pan control to Centre and adjust VR17 for –4.5dBu ± 0.1dB.
3. Measure Insert Send Right and adjust VR18 for –4.5dBu ± 0.1dB.
4. Repeat each step until correct.
E.5.5 Line 4
Adjustment: 1. Measure Insert Send Left and adjust VR12 for 0dBu ± 0.1dB.
2. Set the Pan control to Centre and adjust VR19 for –4.5dBu ± 0.1dB.
3. Measure Insert Send Right and adjust VR20 for –4.5dBu ± 0.1dB.
4. Repeat each step until correct.