Yamaha DME4io-ES Service Manual page 95

2-7 Analog Input Part (HA·ADC) Test
(Test at WORD CLOCK = 48 kHz)
The object to be measured, measuring points and
method are the same as "2-5".
a. Use the test No. 14 and measure the following items.
q Total Harmonic Distortion
Input Frequency Output Level
1 kHz +4 dBu ± 0.1 dBu
20 Hz +4 dBu ± 0.1 dBu
20 kHz +4 dBu ± 0.1 dBu
1 kHz +22 dBu ± 0.1 dBu
w Noise Level
Measuring Method:
Terminate the CHn input with 150 Ω. Measure noise
levels output from the CHn output.
[n=1 – 8 (4) Value in the parentheses (
measuring DME4io-ES]
Permissible Range Measuring instruments
-80 dBu or below LMV-1817
-78 dBu or below System Two/One
e Frequency Characteristics
Measuring Method:
Set 1 kHz as datum, and measure a relative value for
each input frequency.
Input Frequency Input Level Output Level (Reference Value) Permissible Range
20 Hz +10 dBu
20 kHz +10 dBu
2-8 Sounding Test (Analog Input Part [AD])
Use the test No. 14 and measure the following items.
The object to be measured is the same as "2-5".
See the following for the measuring points and
method.
Measuring (Listening) Points:
Test Jig, Analog CH 1 Output
Measuring Method:
Input an analog signal (400 Hz, +10 dBu) from
CH1 input of the DME4io-ES or DME8i-ES and
audibly check an analog signal output from CH1
output of the measuring jig.
Criteria:
Audibly check for over 15 seconds and make
sure that no noise is output.
Permissible Range
0.05% or below
0.05% or below
0.05% or below
0.015% or below
) is for
+4 dBu -1.0 dB – +0.5 dB
+4 dBu -1.0 dB – +0.5 dB
DME4io-ES/DME8i-ES/DME8o-ES
2-9 Analog Output Part (DA) Test
(Test at WORD CLOCK = 96 kHz)
Object to be measured: DME4io-ES, DME8o-ES
Measuring Points:
Analog CH 1 – 8 (4) Output of DME4io-ES or
DME8o-ES
[Value in the parentheses (
DME4io-ES]
Measuring Method:
Input an analog signal from CHn input of the
measuring jig and measure an output signal from
CHn output of the DME4io-ES or DME8o-ES.
[n=1 – 8 (4) Value in the parentheses ( ) is for
measuring DME4io-ES]
Take measurements referring to "3-16. DA Test"
(P. 69) of the test program.
Test No. Fs PHANTOM
1 96 kHz OFF
2 48 kHz OFF
3 48 kHz ON
Use the test No. 1 and measure the following items.
q Voltage gain
Input Frequency Input Level Specifi ed Output Level Permissible Range
1 kHz +10 dBu
w Frequency Characteristics
Measuring Method:
Set 1 kHz as datum, and measure a relative value for
each input frequency.
Input Frequency Input Level Output Level (Reference Value) Permissible Range
20 Hz +10 dBu
40 kHz +10 dBu
e Noise Level
Measuring Method:
Terminate CHn input with 150 Ω. Measure noise
levels output from the CHn output.
[n=1 – 8 (4) Value in the parentheses (
measuring DME4io-ES]
Permissible Range Measuring instruments
-80 dBu or below LMV-1817
-78 dBu or below System Two/One
r Level Difference between CHs
Confi rm the range of difference in the gain between each
CH (CH1 – 8) measured in item q above as follows.
Permissible Range
Within 1 dB
) is for measuring
+4 dBu +4 ± 2 dBu
+4 dBu -1.0 dB – +0.5 dB
+4 dBu -1.0 dB – +0.5 dB
) is for
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