The Tektronix AA501A MOD WQ (I have no idea what that is) is a Distortion Analyzer that is powered by a
TM500 Serries power supply. Combined with a SG505 this makes a very nice Audio Anylasis System.
Some of the specifications are:
Fully Automatic
Level, THD and db Tatio Measurements
Digital Readout plus analog bar graph for peaking and nulling
10Hz to 100kHz frequency range
Has Volts, dBm or dv ratio modes
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TEKTRONIX MODEL AA501A DISTORTION ANALYZER WITH TM502A POWER MODULE MAINFRAME
FULLY AUTOMATED MEASUREMENT OF LEVEL, TOTAL HARMONIC DISTORION PLUS NOISE (THD + N)
HARMONIC DISTORTION FUNCTION:
FUNDAMENTAL FREQUENCY RANGE- 10Hz TO 100KHz, AUTOMATICALY TUNED TO INPUT FREQUENCY
DISTORTION RANGES- AUTO (100%), 20%, 2%, 0.2%, AND dB (AUTORANGING)
ACCURACY- 20Hz TO 20KHz WITHIN +/-10% (+/-1dB) FOR HARMONICS TO 100KHz, 10Hz TO 100KHz IS WITHIN +10%(+1dB), -20%(-2dB FOR HARMONICS TO 300KHz)
ACCURACY IS LIMITED BY RESIDUAL THD+N AND FILTER SELECTION
TYPICAL FUNDAMENTAL REJECTION- AT LEAST 10 dB BELOW SPECIFIED RESIDUAL THD+N OR ACTUAL SIGNAL THD, WHICHEVER IS GREATER
MINIMUM INPUT LEVEL- 60mV (-22dBm)
LEVEL FUNCTION:
MODES- VOLTS, dBm (600 OHM), OR dB RATIO (W/ PUSH-TO-SET 0 dB REFERENCE)
LEVEL RANGES- 200 uV FULL SCALE TO 200 V FULL SCALE IN 10 STEPS, MANUAL OR AUTORANGING
ACCURACY- 20Hz TO 20KHz +/- 2% (+2 COUNTS), +/- 0.3 dB + 0.5% OF READING
10Hz TO 100KHz +/- 4% (+2 COUNTS), +/-0.5 dB + 0.5% OF READING
BANDWIDTH- 300KHz
FOUR(4) BUILT-IN FREQUENCY-WEIGHTED FILTERS
DIGITAL READOUT PLUS ANALOG-TYPE LED BARGRAPH FOR READING PEAK AND FOR NULLING
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