42 Series
Schematic
10074 SW Arctic Drive Beaverton, OR 97005 503-641-7287
Service Bulletin
В Blamp Systems, Inc.
ESP, О.’ Вох 728 вища
ju - Beaverton, OR 97075
- E 203/641-6767. > AS:
March 23, 1983 ETA ATTE
42 SERIES METER CALIBRATION
1. SINEWAVE GENERATOR
2. AC VOLTMETER. (Log Scale)
1. INSERT A -20db LEVEL SIGNAL INTO CH. 16 (24) LINE INPUT.
2. SET THE LINE/MIKE SWITCH OUT. ALL EQ'S AND PAN CENTERED.
ALL AUX, ECHO, AND MONITOR CONTROLS FULLY CW. DEPRESS SUB
1,2,3,4 ASSIGN SWITCHES. SET THE SLIDE FADER TO ITS MAXIMUM
OUTPUT POSITION.
3. INSERT THE AC VOLTMETER TO CH. 16 (24) DIRECT OUT. ADJUST THE
TRIM CONTROL FOR "O"db (0.775 VRMS) OUT.
4. MOVE THE AC VOLTMETER TO SUB 1 OUT. ADJUST THE SUB 1 FADER FOR
AN OUTPUT OF "0"db. REPEAT FOR SUBS 2,3,4, LEFT MAIN, RIGHT
MAIN AND MONITOR.
5. LOCATE THE SUB 1 METER CALIBRATION CONTROL .ON THE UNDERSIDE
OF THE SUB 1 CIRCUIT BOARD. ADJUST THIS CONTROL FOR A "O"'db
READING ON THE PAÑEL METER.
REPEAT THIS PROCEDURE FOR SUBS 2,3, AND 4.
METER CALIBRATION IS NOW COMPLETE
NOTE: OTHER OUTPUT LEVELS MAY BE USED AS A REFERENCE WHEN
CALIBRATING THE METERS FOR USE WITH EQUIPMENT RE-
QUIRING A DIFFERENT REFERENCE LEVEL.
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