ATI Audio DM500 Panduan Pengoperasian dan Pemeliharaan - Halaman 4
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Halaman CetakMETERING
The DM500 allows front panel selection of two metering modes. The D/A mode measures the direct
output of the D/A Converter and is calibrated (internal adjustments M2L, M2R) to just indicate
0dBFS maximum at full digital input count. 0dBFS on the D/A meter corresponds to +22dBm line
output level. The D/A scale measures five additional steps down from 0dBFS, calibrated at -6, -12, -
15, -18 and -24dB.
The LINE mode meters the audio line output and is calibrated to read 0dB at +4dBm line output
level with internal calibration adjustments M1L and M1R. The LINE meter scale measures 12dB
above and below the 0dB point.
The ballistics of the meter displays are designed to closely follow the requirements of DIN45406 for
PPM response in order to best indicate audible peaks.
DISPLAY
The DM500 displays the input signal sample rate Fs (if within +1and -4% of the standard
frequency) on a set of five front panel LED indicators (32, 44.1, 48, 88.2 and 96kHz). A green data
VALID readout indicates that the received data was correct when sent and that there are no
subsequent parity or bi-phase coding violations or an out-of-lock PLL clock receiver. Out-of-range
or no-signal conditions blank these indicators. The DM500 indicates the following data errors with
separate red LEDs:
Bi-Phase Error—Indicates incorrect bi-phase signal coding
CRC Error—Cyclic Redundancy Check (CRC) value calculated for the receiver signal does not
match the CRC byte of the channel status word
No Lock Error—Signal contains no data or is corrupted beyond recoverable limits
Parity Error—Indicates a parity error due to mismatched ones and zeroes in the audio data
subframe
POWER
The DM500 operates from four 9-volt batteries installed in the removable battery pack. The battery
pack cable should be inserted into either of the DC input connectors present on the rear of the main
chassis. Note that the outer shell of the DC power cable connector is Positive with respect to the
center pin. Models DM500-1 and DM500-2 are supplied with an external 24VDC power module for
operation from 120VAC and 230VAC, respectively. The main chassis loop-thru DC connectors
allow multiple NanoAmp units to operate from a single external power module. Allow one power
module for every two DM500-1 or DM500-2 units. Accessory power modules WA100-1 and
WA100-2 and loop-thru cables 20602-1 are available.
A front panel POWER switch and LED Power indicator are provided.
ATI Audio Inc.
■ Tel: 856-626-3480
Fax: 856-504-0220
■
www.
audio.com
■