User manual

3-12 Section 3: Installation
Moseley SL9003Q 602-12016 Revision G
8. Measure the audio frequency response:
32 kHz sample rate: 5 Hz-15 kHz +/- 0.2 dB
44.1 kHz sample rate: 5 Hz-20 kHz +/- 0.2 dB
48 kHz sample rate: 5 Hz-22.5 kHz +/- 0.2 dB
9. Signal to Noise: Measure the 1 kHz level and set a reference for an SNR
measurement.
10. Disconnect or disable the tone at the encoder input and measure the SNR of the
system:
AES/EBU in/out: < -90 dB (-92 typ.) Linear/Compressed
ANALOG in/out: < -82 dB (-84 typ.) Linear/Compressed
11. Reapply the 1 kHz tone and measure THD:
Linear, AES/EBU: <0.01% (.0025% typ.)
Linear, Analog: <0.01% (.008% typ.)
MPEG, AES/EBU: <0.01% (.003% @ 1kHz typ.)
MPEG, Analog: <0.015% (.012% @ 1kHz typ.)
NOTE: The static distortion measurement of MPEG compressed audio is
erroneous in the fact that the compression algorithm is dependent upon dynamic
audio level changes (i.e., music). The subjective aural distortion is much lower.
The static measurement is also dependent on frequency (.007 % typ @ 7-
12kHz). The above values are typical at 1kHz and will provide excellent on-air
performance.
3.2.3. Digital Composite and Data Channel Bench Test
Test Equipment
RF Wattmeter
950 MHz operation with a measurement range of 1–5
Watts
RF Power Attenuator
50 ohm, 5 watt “dummy load” for 950 MHz operation with
20 to 30 dB of attenuation
Variable Step Attenuator
0–100 dB at 950 MHz
Serial I/O Data
RS232, 300-9600 bps; (equivalent to the subcarrier data
port that will be used in the site installation, use the
actual remote control equipment if possible)
FM STereo generator
optional - digital stereo generator (Orban 8202 or
equivalent)
FM stereo monitor
optional - digital stereo demodulator (belar fmsa-1 or
equivalent)
Audio Distortion Analyzer
AES/EBU digital audio I/O is desirable. (Test equipment
will allow adjustment of levels for calibration check.)