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2-4. Input/Output Gain Adjustment
2-4. Input/Output Gain Adjustment
The specification value described for this input/output gain adjustment is set when the gain is 0 dB (during factory setting). If the customized gain is other than 0 dB, increase or decrease the specification value proportionally to the difference of the gain. Measuring equipment: Audio level meter 1. Set the output of the audio signal generator to +4.0 dBm, 1 kHz. CH1 adjustment 2. Connect the generator to the CH1 input of AUIDO IN connector of the audio A/D converter board (BKPFL751). 3. Connect the AES/EBU OUT1 connector of the audio A/D converter board (BKPF-L751) to the AES/EBU IN1 connector. 4. Connect the audio level meter to the CH1 output of AUDIO OUT connector. 5. Adjust the CH1 output level on the audio level meter. Adjustment point: 1RV101/DAC-38 (A-1) Specification: 4.0 ± 0.1 dBm (at 600 Z load) CH2 adjustment 6. Connect the generator to the CH2 input of AUDIO IN connector of the audio A/D convertor board (BKPFL751). 7. Connect the audio level meter to the CH2 output of AUDIO OUT connector. 8. Adjust the CH2 output level on the audio level meter. Adjustment point: 1RV201/DAC-38 (A-2) Specification: 4.0 ± 0.1 dBm (at 600 Z load) CH3 adjustment 9. Connect the generator to the CH3 input of AUDIO IN connector of the audio A/D converter board (BKPFL751). 10. Connect the AES/EBU OUT2 connector of the audio A/D converter board (BKPF-L751) to the AES/EBU IN2 connector. 11. Connect the audio level meter to the CH3 output of AUDIO OUT connector. 12. Adjust the CH3 output level on the audio level meter. Adjustment point: 1RV301/DAC-38 (A-2) Specification: 4.0 ± 0.1 dBm (at 600 Z load) CH4 adjustment 13. Connect the generator to the CH4 input of AUDIO IN connector of the audio A/D converter board (BKPFL751). 14. Connect the audio level meter to the CH4 output of AUDIO OUT connector. 15. Adjust the CH4 output level on the audio level meter. Adjustment point: 1RV401/DAC-38 (A-3) Specification: 4.0 ± 0.1 dBm (at 600 Z load) 16. After turning off the power, reset the switch (S3) on the DAC-38 board to the customer settings. n 0 dBm = 0.775 V rms
