PA-2_Test_Spec_96 电路图.pdf

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1、- PA2 TEST SPEC TEST SPECIFICATION: Sorial No: 14021 1 onwards Issue 2: 30th ADM. 1996. Tolerance on inputs +/-O.3dB, outputs +/-ldB, 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 t

2、he chassis ground screw. 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 a

3、ll knobs and switches operate freely and are unifonnly spaced from the panel, 3.6 - all XLR connectors are locked, 3.7 - LED alignntent with front panel. Tests 4 and 5 should be performed on each channel: 4. PHANTOM POWER: +24V+/-IV. DI Box: 48V On, measure on pins 2 and 3 of Mic input socket with 6

4、K8 termination jig. Turn off 48V. RadioFans.CN 收音机爱 好者资料库 5. INPUTS: 5.1 MIC INPUT: Output OdBu. DI Box: Mic Input, Gain Max, Line level output. A2: 1KHz, Sine, -60dBu, 22-22K Filter, Meter. 5.2 OUTPUT LEVEL: -30dBu. DI Box: Output level to Mic. Return output level to Line after test. 5.3 DISTORTION

5、: Limit 0.05%. A2: Level -20dBu. DI Box: Adjust gaip. for OdBu output. 5.4 FREQUENCY RESPONSE: Limit -1 dB, 20Hz-40KHz. A2: 22-22K Filter off, Sweep. 5.5 MIC INPUT NOISE: Limit -67dBu (EIN = -127dBu). DI Box: Disconnect input and replace with IS0R termination, Gain Max. 5.6 KEYBOARD INPUT: Output -1

6、2dBu. DI Box: Instrument, Keyboard. A2: Level -20dBu. 5.7 GUITAR INPUT: Output +8dBu. DI Box: Guitar . 5.8 PEAK LED: A2: Level-l0dBu. DI Box: Adjust Gain and check LED begins to glow 0 +/-2dBu output, incresasing to maximum intensity +10 +/-3dBu output. 5.9 THROUGH SOCKET: Check -IOdBu unbalanced on

7、 the through socket. 6. PHASE. 6.1 PHASE: Limit 0 +/-2deg. DI Box: Adjust chamlel B Gain for -10dBu output. A2: Phase (needs OUT B to CH B cable). RadioFans.CN 收音机爱 好者资料库 . 6.2 PHASE REVERSE: Limit -180 +/-2deg. DI Box: Phase Reverse. 7. SOAK TEST. 8. AUDIO/QA TEST. . ( i ! OJ RadioFans.CN 收音机爱 好者资料库