PA-2_Test_Spec_95 电路图.pdf

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1、- ; PA2 TEST SPEC TEST SPECIFICATION: Issue 1: 7th February 1995. Tolerance on inputs +/-O.3dB, outputs +/-1dB, unless stated otherwise. 1. MAINS VOLTAGE: Set to 240V. 2. GROUND CONTINUITY: Limit 0.01 ohms. 2.1 Measure the resistance between the ground pin of the IEC inlet to the chassis ground scre

2、w. 3. VISUAL INSPECnON: Inspect the unit, paying particular attention to the following items: 3.1 - the orientation of power supply diodes and capacitors, 3.2 - the orientation of Ics, 3.3 - all mains wiring, 3 .4 - the quality of external paint and silk screening, 3.5 - check all knobs and switches

3、 operate freely and are uniformly spaced from the panel, 3 .6 - all XLR connectors are locked, 3.7 - LED alignment with front panel. Tests 4 and 5 should be performed on each channel: 4. PHANTOM POWER: +24V+/-1V. DI Box: 48V On, measure on pins 2 and 3 ofMic input socket with 6K8 termination jig. Tu

4、rn off 48V. RadioFans.CN 收音机爱 好者资料库 - . t;, ;:f 5. INPUTS: 5.1 MIC INPUT: Output OdBu. 01 Box: Mic Input, Gain Max. A2: 1KHz, Sine, -60dBu, 22-22K Filter, Meter. 5.2 DISTORnON: Limit 0.05%. A2: Level -20dBu. 01 Box: Adjust gain for OdBu output. 5.3 FREQUENCY RESPONSE: Limit -ldB, 20Hz-40KHz. A2: 22-

5、22K Filter off, Sweep. 5.4 MIC INPUT NOISE: Limit -67dBu (EIN = -127dBu). 01 Box: Disconnect input and replace with IS0R termination, Gain Max. 5.5 KEYBOARD INPUT: Output -12dBu. 01 Box: Instrument, Keyboard A2: Level -20dBu. 5.6 GUITAR INPUT: Output +8dBu. 01 Box: Guitar. 5.7 PEAK LED: A2: Level-l0

6、dBu. 01 Box: Adjust Gain and check LED begins to glow 0 +/-2dBu output, incresasing to maximum intensity + 10 +/-3dBu output. 6. PHASE. 6.1 PHASE: Limit 0 +/-2deg. . 01 Box: Adjust channel B Gain for -IOdBu output. A2: Phase (needs OUT B to CH B cable). 6.2 PHASE REVERSE: Limit -180 +/-2deg. DI Box: Phase Reverse. 7. SOAK TEST. 8. AUDIO/QA TEST. RadioFans.CN 收音机爱 好者资料库