Yamaha AD8HR Service Manual page 55

w f Gain
Condition: Use a tolerance range of 1kHz as standard.
Input Frequency
20Hz
40kHz
e Distortion
Input Frequency
1kHz
r Noise Level
Condition: INPUT 1 - 8CH shorted with 150Ω.
GAIN
+10dB
t Noise level EIN
Condition: INPUT 1 - 8CH shorted with 150Ω.
GAIN
-62dB
However, if not within tolerance range, then use: Measured value - (Gain at 1kHz) ≦ -125.
Basis for EIN ≦ -125
This is used because of 3dB differential of measured values. This differential is made between one value (12.7kHz 6dB/oct
LPF Weighted, Average) measured by a noise meter, the DA824 and the MY8-AE card, and the other value (20kHz BW,
LPF Weighted) measured by the System Two.
Example: In case of the output of DA824,
Measured vale Gain
y Level differential between channels
The range of differential gain when measured as in q is specified as follows.
Tolerance Range
Within 1dB
u Crosstalk between odd and even-numbered CH.
Conditions: Signal input to odd-numbered CH.
Input Frequency
1kHz
Same for even-numbered CH.
i Phantom
Short pin 2 and pin 3 on the XLR, connect a 10kΩ load across pins 2-1, and set the +48V MASTER SW key to ON. The
voltage shall be as follows when the +48V key is ON.
Tolerance Range
DC33 ∼ 37V
With the +48V MASTER SW key at OFF, check that discharge quickly starts when the +48V key is set to OFF.
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Input Level GAIN
+10dBu +10dB
-62dBu -62dB
+10dBu +10dB
-62dBu -62dB
Input Level GAIN
+29dBu +10dB
-43dBu -62dB
Tolerance Range
-108dBFS or lower (-90dBu or lower)
Tolerance range
-83dBFS or lower (-68dBu or lower / 12.7khz, 6dB / using oct LPF)
(-68) - (60) = -128 [dBu]
EIN
Even-numbered CH shorted with 150Ω.
Output Level (odd number CH)
-1dBFS (+17dBu)
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Tolerance Range
-1.5 ~ +1dB
-3 ~ +1dB
-1.5 ~ +1dB
-3 ~ +1dB
Specified OUT level Tolerance Range
-1dBFS (+17dBu) 0.01% or lower
-1dBFS (+17dBu) 0.05% or lower
The number in the parentheses ( ) shows the output of DA824.
is equivalent to EIN 125 dBu in System Two.
Tolerance Range (even number CH)
The number in the parentheses ( ) shows the output of
-81dBFS or lower (-63dBu or lower)
DA824.
The number in the parentheses ( ) shows
the output of DA824.
The number in the parentheses ( ) shows the
output of DA824.
AD8HR
55