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AA-51A Audio Analyzer
PDF Brochure |
DESCRIPTION
The AA-51A is a multi-purpose, precision audio analyzer that helps
to automate proof-of-performance measurements and equipment maintenance.
Unique features of the AA-51A make it the ideal instrument for engineers,
and service professionals. Excellent RFI shielding enables measurements
to be made within the high-level RF environments of commercial broadcast
transmitter facilities.
Total harmonic distortion measurements are made by simply setting
the Mode Switch to THD and reading the meter. The AA-51A automatically
accomplishes nulling and tuning to the inputfrequency. This enables
the operator to accurately measure the harmonic distortion at various
discrete frequencies and different power levels much faster than using
conventional distortion analyzers.
Intermodulation distortion measurements are performed with equal simplicity.
Utilizing the SMPTE Standard intermodulation signal the AA-51A displays
percent of IM. Measurements are completely automatic over a wide dynamic
range.
Accurate frequency response measurements are facilitated by a wideband
voltmeter which exhibits a flat response (+ or - 0.1dB) from 20 Hz
to 100 kHz. Input level range is 1 mV to 100 V full scale. The average
responding meter is calibrated to the rms value of a sinewave. For
Signal + Noise/Noise measurements the voltmeter bandwidth may be restricted
to 20 kHz by placing the mode switch in the NOISE position.
Incidental frequency modulation -- "Wow and Flutter" -- usually associated
with tape decks, cart machines and turntables is measured automatically.
The AA-51A measure weighted peak flutter as specified by IEEE Standard
193.
Stereo signals and mono signals derived from a stereo source are often
degraded by phase errors and differential gain variation between left
and right channels of a given audio system. The AA-51A contains both
phase and ratio measuring circuitry which enables the operator to
evaluate these characteristics quickly and accurately throughout the
complete audio spectrum, and over a wide dynamic range. Phase angle
is displayed with a zero center scale indication and a full scale,
switch selected sensitivity of either + or - 180 degrees. The ratio
meter is also a zero center scale device with a + or - 6dB full scale
deflection.
The Phase and Ratio measurement features of the AA-51A are particularly
useful for line equalization measurements, azimuth alignment of stereo
tape heads, and trouble shooting of audio consoles, amplifiers, and
networks.
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| AA-51A
SPECIFICATIONS |
Input:
Impedance
Maximum AC
Maximum DC
Common-mode rejection
Cable connector
MON SCOPE output
MON PHONES output
HIGH LED on when:
LOW LED on when: |
Balanced 80 k ohms+100 pF, each pin to ground
220 Vrms, each pin to ground
250 Vdc, each pin to ground
greater than 60dB
Switchcraft p/n 05CL3M
5.6 Vp-p for inputs from 40 mVrms to 90 Vrms, typical
Set to 70mVRMS, internal adj.
Input less than 80 Vrms (except for VM and NOISE)
Input less than 100 mVrms, (except for VM and NOISE) |
THD Meter:
Input frequency range
Measurement passband
Notch attenuation
Ranges
Accuracy
Input level ranges
Internal THD + noise
Filters
METER MON output
Nulling time |
20 Hz to 20 kHz, fundamental
1.7 to 12.5X input frequency at -3dB
greater than 100 dB
6 ranges, 0.03% to 10% full scale, -20 dB to -70 dB full scale
± 15% (± 1.5 dB)
100 mV to 80 V
0.01% max, 0.006% typical, 20 Hz-5 kHz 0.02% max,
0.012% typical at 20 kHz
22 kHz low-pass at input, switch selected
400 Hz high-pass, switch selected
100 mVp-p, meter at full scale
2 seconds approximately |
IMD Meter:
Input signal required
Full scale ranges
Accuracy
Input level range
Internal IMD + noise
METER MON output |
60 Hz + 7 kHz, 4:1 voltage ratio
6 ranges, 0.03% to 10% full scale
± 10%
100 mV to 80 V
less than 0.015%
100 mVp-p, meter at full scale |
AC Voltmeter:
Frequency response
Ranges
Accuracy
METER MON output
Internal noise
Filter
REF SET range |
10 Hz to 100 kHz, + or - 0.1dB max.variation
11 ranges, 0.3 mV to 30 V full scale,
-68 dBm to +32 dBm full scale
± 3%
100 mVp-p, meter at full scale
20 uV(-92 dBm) maximum
400 Hz (at -3 dB) high-pass, switch selected
greater than 10 dB |
Noise Meter:
Frequency response
Ranges
Accuracy
METER MON output
Internal noise
Filter
REF SET range
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20 Hz to 20 kHz at -3 dB
11 ranges, 0.3 mV to 30 V full scale
± 3%
100 mVp-p, meter at full scale
15 uV (-94 dBm) max.
400 Hz (at -3 dB) high-pass, switch selected
greater than 10 dB |
Phase Meter:
Measurement ranges
Accuracy
Polarity
Input frequency range
Input level range
METER MON output
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± 54 degrees and + or - 180 degrees full scale
± 3 degrees
Positive angle means L leads R
20 Hz to 20 kHz
100 mV to 80 V
Rectangular wave at input frequency, duty cycle proportional to angle
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Ratio Meter:
Measurement ranges
Accuracy
Polarity
Input frequency range
Input level range
METER MON output |
± 6 dB
± 0.2 dB
Positive ratio means R greater than L
20 Hz to 20 kHZ
100 mV to 80 V
dc voltage proportional to ratio |
Wow & Flutter Meter:
Measurement ranges
Input frequency
Accuracy
Input level range
Internal Noise
METER MON output |
0.1% and 0.3% full scale
3.15 kHz ± 10%
± 10%
100 mV to 80 V
less than 0.01%
500 mVp-p at full scale, passband 0.2Hz-200Hz |
Frequency Counter:
Frequency range
Resolution
Accuracy
Input level range |
10 Hz to 200 kHz
less than 900 Hz (approx.), 0.1 Hz
900 Hz to 9000 Hz (approx.), 1.0 Hz
9 kHz to 24 kHz (approx.), 0.01 kHz
greater than 24 kHz (approx.), 0.1 kHz
-1 to 0 count error in RH digit (LSD)
1 mV to 80V |
Power:
117 Vac
(230 Vac option) |
50/60 Hz, 10 W |
| Weight, lb (kg): |
5.44 (12) |
Dimensions, in. (cm):
Optional Rack Mount |
15.25 (38.74) W; 5.25 (13.34) H;
10.125 (25.72) D
5.25 (13.34) Rack space rqd. |
Specifications subject to change without notice.
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- Shielded, Balanced Inputs
- Auto-Null THD
- Frequency Readout
- Compatibility with NAB Test CD's
- Stereo Measurements
- Measures:
- THD, IMD, Volts
- Signal + Noise/Noise
- Stereo Phase
- Stereo Ratio
- Wow and Flutter
- Frequency
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