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Question Title Apogee PSX-100 Calibration

Calibration Mode (�Meter Zoom�)

 

Press & Hold the SOFT LIM button to enter Calibration Mode. The SOFT LIM LED will flash. In this mode, the meter scale reads from �20 dBFS (bottom LED) to �11 dBFS (top LED), ie one LED per dB, and the OVER LED illuminates when the level is within ±0.1 dB of the indicated value. CAL mode only affects the meters, and can thus be used whether metering the A/D or D/A, in any operational mode.

 

D/A Calibration

 

The D/A converter can be calibrated over a wide range of likely operating values. It is calibrated from the factory so that an incoming digital signal at �16dBFS produces a level of +4dBu at the analog outputs. So, for example, if you wanted the D/A converters to output a hotter (louder) signal at the analog outputs, you would feed the digital input a level under �16dBFS (for example, �18dBFS) and calibrate the outputs until the analog output level read +4dBu. Likewise, if you wanted a lower DAC output, you would feed the unit a �14 dBFS signal, for example, and calibrate the DAC accordingly. On the next page are brief instructions on how to calibrate the D/A and A/D converters.

Calibrating the D/A Converter

 

1. Use an external source to provide digital signal to the D/A.

 

2. Verify that D/A SYNC is correct and locked.

 

3. Ensure that DIP switch 4 (Output level) is set correctly: OFF for +4dBu, ON for �10 dBV

 

4. Using a �tweaker� or small flathead screwdriver, rotate the left and/or right trimpot in a clockwise direction to increase gain of the D/A. It is not necessary to use a non-conductive tool.

 

 

Calibrating the A/D Converter

 

1. Ensure that DIP switch 5 (Input level) is set correctly: OFF for +4dBu, ON for -10 dBV.

 

2. Using a �tweaker� or small flathead screwdriver, rotate left and/or right trimpot in a clockwise direction to increase gain of the A/D. It is not necessary to use a non-conductive tool.

 

As set at the factory, a digital signal at �16dBFS produces a level of +4dBu at the analog outputs.

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Article Number: 70
Created: 2009-03-31 2:15 PM
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