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DME4io-ES/DME8i-ES/DME8o-ES
96
w
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 ( ) is for
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
+4 dBu
-1.0 dB – +0.5 dB
20 kHz
+10 dBu
+4 dBu
-1.0 dB – +0.5 dB
2-11 Sounding Test (Analog Input Part [DA])
Use the test No. 2 and measure the following items.
Object to be measured: DME4io-ES, DME8o-ES
Measuring (Listening) Points:
Analog CH 1 Output of DME4io-ES or DME8o-ES
Measuring
Method:
Input an analog signal (400 Hz, +10 dBu) from
CH1 input of the measuring jig and audibly
check an analog signal output from CH1 output
of the DME4io-ES or DME8o-ES.
Criteria:
Audibly check for over 15 seconds and make
sure that no noise is output.
2-12 Test for “after changing the output level
(24dBu
→
18dBu)”
If the output level is changed from 24 dBu to 18
dBu with servicing operation, perform the Analog
Output Part (DA) 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 ( ) is for measuring
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”
t
Crosstalk between Adjacent CHs.
t
-1. Crosstalk from Odd CHn to Even CHn+1
[n=1, 3, 5, 7 (n=1, 3) Value in the parentheses
( ) is for measuring DME4io-ES]
Measuring
Method:
Terminate CHn+1 input with 150
Ω
. Input the following
signal into the CHn input and measure noise level at
CHn+1 output.
Input Frequency Output Level (Odd channel) Permissible Range (Even channel)
1 kHz
+22 dBu ± 0.1 dBu
-58 dBu or below
t
-2. Crosstalk from Even CHn to Odd CHn-1
[n=2, 4, 6, 8 (n=2, 4) Value in the parentheses
( ) is for measuring DME4io-ES]
Measuring
Method:
Terminate the CHn-1 input with 150
Ω
. Input the
following signal to the CHn input and measure noise
level at CHn-1 output.
Input Frequency Output Level (Even channel) Permissible Range (Odd channel)
1 kHz
+22 dBu ± 0.1 dBu
-58 dBu or below
y
Maximum output
Input Frequency Input Level
Permissible Range Permissible Range (Distortion Factor)
1 kHz
+30 dBu +23 dBu or above
0.01% or below
u
Total Harmonic Distortion
Input Frequency
Output Level
Permissible Range
1 kHz
+4 dBu ± 0.1 dBu
0.05% or below
20 Hz
+4 dBu ± 0.1 dBu
0.05% or below
40 kHz
+4 dBu ± 0.1 dBu
0.05% or below
1 kHz
+22 dBu ± 0.1 dBu
0.007% or below
2-10 Analog Output Part (DA) Test
(Test at WORD CLOCK = 48 kHz)
The object to be measured, measuring points and
method are the same as “2-9”.
Use the test No. 2 and measure the following items.
q
Total Harmonic Distortion
Input Frequency
Output Level
Permissible Range
1 kHz
+4 dBu ± 0.1 dBu
0.05% or below
20 Hz
+4 dBu ± 0.1 dBu
0.05% or below
20 kHz
+4 dBu ± 0.1 dBu
0.05% or below
1 kHz
+22 dBu ± 0.1 dBu
0.015% or below
Содержание DME4io-ES
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Страница 43: ...43 DME4io ES DME8i ES DME8o ES DA Circuit Board DME4io ES DME8o ES Pattern side パターン側 AD 2NA WG30390 1 ...