54
AD8HR
TOTAL INSPECTIONS
1. SETUP
1-1. Conditions
Set as described below unless there are instructions otherwise.
Set the GAIN to 10dB and the WORD CLOCK INT to 96kHz.
Measure at DIGITAL OUT A (AES/EBU).
Input a signal only to the channel (hereafter CH) being measured.
When measuring NCH, check that a signal is input to NCH.
0 dBu = 0.775Vrms
0 dBFS = 0 decibels - fullscale
Set the output impedance of the oscillator to 150
Ω
.
Set the input impedance on the oscilloscope or level meter to 100k
Ω
or more.
In the noise measurement, correct with the Filter "A" WEIGHTING of System Two.
In the distortion measurement, correct with BW:FS/2 of System Two.
The EIN measurement should be made using the DA824 and MY8-AE cards and compensating (measuring the average
value not effective value) with an LPF of -6dB/oct at 12.7kHz, or should be the test using System Two and a conversion
value corrected with BW: 20kHz LP.
Do not initialize the system unless having any influence on repair. Measured value shows the Factory Preset condition.
When initializing the system, make sure to verify the data. Therefore, make sure to check the data. See "7. Factory
Settings" for the initialization. (P.57)
1-2. Connection
Input Frequency
1kHz
Input Level
+10dBu
-8dBu
-20dBu
-50dBu
-62dBu
GAIN
+10dB
-8dB
-20dB
-50dB
-62dB
Specified OUT level
-20dBFS
(-2dBu)
Tolerance Range
-20
±
1dBFS
(-2
±
1dB)
2. Testing with WORD CLOCK INT 96kHz
2-1. INPUT 1 - 8CH
q
Gain
In case of using System Two
q
In case of using DA824
w
System
Two
AD8HR
AD8HR
DA824
DIGITAL
OUT A
DIGITAL
OUT A
IN
OUT
MY8
-AE
Oscilloscope
Level meter
Distortion meter
Oscillator
Rs=150
Ω
※
The internal gain SW
should be set to +18dB.
The number in the parentheses ( ) shows
the output of DA824.
