McIntosh AA2 Acoustic Analyzer.pdf
Ifltlntosh A A 2 ACOUSTIC ANALYZER V SERVICE INFORMATION STARTING WITH SERIAL NO. BU1001 C McIntosh laboratory inc. Binghamton, new york 13903 39-027 AA2 PERFORMANCE LIMITS METER CIRCUIT Frequency Range: 20 Hz to 20 kHz, response 0.5 dB Waveform Response: Average responding calibrated in RMS volts and dB SPL Averaging Time: Selectable, fast and slow (5 sec. and 30 sec.) Signal Range: SPL, 60 dB to 100 dB at mid scale volts, lmV to 100m volts AC full scale Meter Scales: Volts calibrated from .01 to 1. SPL, calibrated from -20 dB to + 20 dB Crest Factor: Greater than 4 at full scale. Input Impedance: 50k ohms and less than 50pF Meter Output Level And Impedance: 1 volt output at full scale meter reading Source impedance 300 ohms Load impedance not less than 10k ohms ONE THIRD OCTAVE FILTER Frequency Range: 20 Hz to 20 kHz in 31 ranges with ISO recommended band frequencies (20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200 and multiples of 10 and 100 thereof) Selectivity: 1/3 octave bandwidth (29% wide). Two filter sections are used each having a pole butterworth filter characteristic. At .58 and 1.8 times the center frequency, each section is down 15 dB (30 dB for both sections). PINK NOISE GENERATOR Frequency Range: 20 Hz to 20 kHz with output + 1 dB per 1/3 octave bandwidth Output Level: 0 to 1 volt RMS into 10 k ohms or higher. Output source impedance less than 1 k ohm. Output is peak limited for all settings of the level control. Crest Factor: About 4 Source: Digital logic pseudo random noise generator CM 201 CONDENSER MICROPHONE Response 20 - 20,000 Hz (see typical curves) Sensitivity -65 dB re 1 volt per microbar at 1 kHz nominal Noise equivalent 44 dB SPL unweighted Cartridge diameter 13 mm (.46 inches) Cable:- Two conductor shielded. Length 10 meters (32.8 feet) Stand adapter with 5/8 - 27 thread POWER REQUIREMENTS 120 volts, 50-60 Hz, 6 watts MECHANICAL INFORMATION Size: Length 11.75 (29.8 cm), width 8.75 (22.2 cm), height 9.5 (24.1 cm) Weight: 14 pounds (6.35 kg) net, 16 pounds (7.26 kg) in shipping carton Finish: B1ack CM 201 MICROPHONE INPUT JACK SWITCH 120 V AC=r input REGULATED POWER SUPPLY 18V OV 18V GANGED GANGED IEQUENCY SWITCH BLOCK DIAGRAM AA2 AA2 _r INPUT MIC INPUT Q_ | TIME AVERAGING | A t C)Q 3 I m + _i m uj + - CO 00 (JO MAIN 045-181 100 SERIES SYMBOL NOS FILTER I OUT METER OUT FILTER I IN P.N. OUT FILTER 2 IN FILTER 2 OUT 3 (O0WW0 YEL/WHT OV PUR/WHT OV 2 BRN/WHT 0V m Bn /CRN/WHT grnB ov 1 / BLU/ WHT BLUfl ov _ o o L.E. D. z rL o + 120 V AC 60 Hz 1/8 A ON OOFF OV BLK OV BLK o _ov BLK F2 SEC 2 IN I It) fil 045-184 F2 SEC I IN (12) ov GRN/WHT -RESISTOR SWITCH) GRN PCB 2 | -(7 045-184 grnTwhtV w _OV-/ | RESISTOR SWITCH ORN Vw PCB 3 -045-184 ORN/WHTVi SCHEMATIC NOTES r ! 1. Unless otherwise specified: Resistance values are in ohms, l/1* watt, and 5% tolerance; capacitance values smaller than 1 are in microfarads (pF); capacitance values greater than 1 are in picofarads (pF); inductors are in microhenries (pH). 2. Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers around the dotted lines correspond to the numbers on the PC Board layouts. 3. The heavy lines on the schematics denote the primary signal path. The heavy dash lines on the schematics denote a secondary signal path. 4. The terminal numbering of rotary switches is for reference only. All voltages indicated on the schematics are measured under the following conditions; a. Use of an 1 megohm input impedance VTVM. b. All voltages 10% with respect to chassis ground. c. Ho signal at input terminals. d. AC input at 120 volts, 50/60 Hz. e. Front panel controls at: Meter Avg. Time Frequency Meter Range Function Fast 1000Hz 80dB Fi 1 ter Off Pink Noise ccw 6. Four identical resistor switch P. C. boards are used per AA 2. Switch sections are numbered 1 thru 4 and resistors are numbered -1 thru -4. Example, R422-1 is on section 1 and R422-3 is on sect ion 3. MAIN PC BOARD 045-181 ino Nd 1*4 FUNCTION filter OFF 1/3 OCTAVE ANALYZER CTION AA2 FILTER PC BOARD 045183 RESISTOR SWITCH PC BOARD 045-184 SEE NOTE 6 R430 AA2 AA2 POWER SUPPLY AA2 AA2 REPLACEMENT PARTS A 1 1 pa rts not listed are common i terns obtain- METERS able from radio parts jobbers. Ml Meter 124-030 Replacement parts may be obtained when ordered by PART NUMBER from: KNOBS McIntosh Laboratory, 1 nc. F requency 090-192 Customer Service Department 2 Chambers Street Binghamton, New York 13903 Meter range 090-193 (Telephone 607-723-3512) Function 090-193 DIODES Pink noise 1 eve 1 090-193 Symbol Part Number Description Number MICROPHONE D 1 LED lamp 070-100 Microphone 250-049 D101,102 Si. si gna1 diode 070-047 MlSCELLANE0US D103,104 Si. si gna1 diode 070-047 Mic stand adapter 114-062 D201 B ridge 070-044 Cable 6 ft. 170-109 D202,203 Si. signa 1 diode 070-047 Cab 1e 6ft. 170-110 D204.205 Zener 24V 070-065 Hand 1 e 1 14-060 INTEGRATED CIRCUITS Owners Manual 039-026 IC101,107 1ntegrated Circuit 133-043 Graph paper pad 039-050 IC102,104 1ntegrated Circuit 133-037 Line cord 170-021 1C105,106 Integrated Circuit 133-037 Fuseholder 178-099 1C 103 1ntegrated Circuit 133-055 Shipping carton 033-245 IC201 Regulator + I8v 133-045 Headphone jack 117-138 1C202 Regulator - 18V 133-044 IC301,302 Integrated circuit 133-043 IC303.304 Integrated circuit 133-043 1C305,306 Integrated circuit 133-043 SWITCHES S101 Meter range 146-189 SI 02 Function 146-190 S400 Fi1 ter (Wafer) 146-192 S400 Fi 1 ter (Hardware) 146-191 S 1 Time averaging 149-011 S3 Power 149-011 POTENTIOMETERS Rl Mic. Cal. 134-318 R3 Pine noise level 134-317 R140,142 Trimmer 1OOfi 134-298 TRANSFORMERS T1 Power transformer 159-140 FUSES Ft Fuse 1/8A Norm Bio 089-035
