Apogee Rosetta 200 Gebruikershandleiding - Pagina 15

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Apogee Rosetta 200 Gebruikershandleiding

ROSETTA 200 – User's Guide

Navigating the Front Panel -

Follow these steps to calibrate the Rosetta 200:

1 Before entering CAL mode, set both SOURCE (to Digital Outputs) and SOURCE (to Analog Outputs) to Analog.

2 Connect a 1 kHz tone at the desired analog reference level (usually +4 dBu) to both Analog inputs, and

connect an analog meter (voltmeter or analog VU meter) to the Analog outputs.

3 Engage CAL mode by pressing and holding PROCESS.

4 Select the A/D channel(s) to calibrate, and press the + (CLEAR) or – (SOURCE to Digital Outputs) buttons until the

desired digital reference level is displayed on the corresponding LED bargraph. When only one LED (per channel) is

lit, the A/D is calibrated to within +- .1 db of the speciﬁed level.

5 Select the D/A channel(s) to calibrate, and press the + (CLEAR) or – (SOURCE to Digital Inputs)

15) APTOMIZER – A new Apogee technology developed for the Rosetta 200, APTOMIZER sets A/D and D/A

calibration levels by detecting peak level information at the A/D converter and adjusting both analog inputs and

outputs for the optimal setting. Think of APTOMIZER as an alert assistant who constantly re-calibrates the unit

based on the input received (even if "alert assistant" is an oxymoron).

ON-OFF – turns APTOMIZER On or Off. Note that when APTOMIZER is turned Off, calibration levels return to

the last manually adjusted values.

TRIM – Once the Rosetta 200 has determined an optimal calibration level in LEARN mode, it's possible to trim

this level using the – (SOURCE) and + (CLEAR) buttons. Each button push modiﬁes calibration levels .1 dB.

LEARN – Press and hold the APTOMIZER button to engage LEARN mode. While in LEARN mode,

the A/D calibration level is dynamically adjusted so that the highest peak detected at the analog inputs

results in a digital level of -.5 dBFs. To preserve unity gain through the unit (i.e. what goes in is what

comes out), the D/A calibration level is adjusted simultaneously.

APTOMIZER and Soft Limit – When LEARN mode is engaged, the A/D calibration level drops to its

lowest gain value in order to comfortably accept input peaks up to +24 dBu. To avoid misdetection

of peaks, Soft Limit is disengaged when LEARN mode is engaged. If using Soft Limit, it's suggested

to check calibration levels once LEARN mode is disengaged, and modify if necessary with the TRIM

buttons (– (SOURCE) and + (CLEAR)).

When engaging LEARN mode, please note that previously detected calibration values set by

APTOMIZER are lost.

16) METERS – These bargraphs display the digital level of both SOURCE selections. When the Rosetta 200 is

conﬁgured as an A/D – D/A (i.e SOURCE (to Digital Outputs) is set to Analog and SOURCE (to Analog

Outputs) is set to a digital source), the ANALOG bargraph displays the analog input after A/D conversion

while the DIGITAL bargraph displays the digital input before D/A conversion.

17) SOURCE (to Analog Outputs) – This parameter selects the input source that is routed to the Analog

outputs. When a digital input is selected, the Rosetta 200's D/A converters are employed to convert the

selected input to digital.

18) SRC (Sample Rate Conversion) – When a digital source has been selected, press and hold SOURCE (to

Analog Outputs) to engage SRC.

continued

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