SB168-ES
74
1. Preparation
1-1. Setup
Conduct the ANALOG IN/OUT characteristics test with the
ANALOG test of the test program. Set up so that the test
program can be executed referring to “Test Program” (page 46).
1-2. Measuring
Instruments
Use measuring instruments which can measure the inspection
items accurately with con
fi
dence.
Input impedance of the measuring instrument should be 100 k
Ω
or more.
· Level meter
· Frequency counter.
· Distortion meter
· Oscillator
1-3. Parameters
Unless otherwise speci
fi
ed, the following conditions should be
met.
· Set 0 dBu = 0.775 Vrms.
· 0 dBFS = 0 dB, full scale
· Set the +48V MASTER switch to ON.
· Analog output load should be 600
Ω
for each channel.
· Weight with LPF at 12.7 kHz, -6 dB/oct during the
measurement of noise level and crosstalk between adjacent
channels. Measuring should be at average values, not root-
mean-square values.
· Correct the distortion measurement with an 80 kHz, -18 dB/
octave low pass
fi
lter.
· Set the oscillator output impedance to 150
Ω
.
2.
ANALOG IN/OUT Characteristic Test
2-1. INPUT 1 – 8
→
OUTPUT 1 – 8
Select the test program menu “MUTE OFF” for the tests
①
through
⑤
Select the test program menu “MUTE ON” for the test
⑥
.
Parameters
Input an analog signal from the CHn input (n = 1 to 8) and
measure the output signal from the CHn output (n = 1 to 8).
①
Gain
Input Frequency
Input Level
Specifi ed Output Level Permissible Range
1 kHz
+10 dBu
+4 dBu
+4 ±2 dBu
②
Distortion
Input Frequency
Output Level
Permissible Range
1 kHz
+4 dBu
0.05% or less
1 kHz
+22 dBu
0.01% or less
③
Residual noise
Parameters
Short the INPUT to be measured with 150
Ω
.
Permissible Range
-80 dBu or less
④
Level Difference between channels
The range of difference in the gain measured in the item
①
should be as follows.
Permissible Range
Within 1.5 dB
⑤
Crosstalk between adjacent channels
Parameters
Measure the noise level between an odd number channel and
the adjacent even number channels on both side. Open the input
of the even channels to be measured.
Input Frequency Output level (Odd channel) Permissible range (Even channel)
1 kHz
+23 dBu
-57 dBu or less
The parameters for even channels are the same.
⑥
MUTE signal (OUTPUT 1)
Output a signal of +4 dBu from an output and check that output
level is -25 dBu or less when the MUTE is turned ON.
Take measurement of OUTPUT 1 as a sample.
2-2. Sound
check
Select the test program menu “GAIN MIN”. (See page 55)
Input an analog signal (400 Hz, +10 dBu) from the CH1 input
and audibly check the analog signal output from the CH1
output.
Audibly check for over 15 seconds and make sure that no noise
is output.
2-3. Vari pitch sound signal test
Select the test program menu “GAIN MIN”. (See page 55)
Input an analog signal from the CH1 input and measure the
output signal from the CH1 output.
Gain
Word Clock
Input
Frequency
Input Level
Specifi ed
Output Level
Permissible
Range
q
43.0 kHz
1 kHz
+10 dBu
+4 dBu
+4 ±2 dBu
w
49.2 kHz
Audibly check for over 15 seconds and make sure there is no
sound discontinuity or distortion.
INSPECTIONS
Summary of Contents for SB168-ES
Page 7: ...7 SB168 ES DIMENSIONS 寸法図 480 350 132 359 7 5 7 10 142 4 Unit 単位 mm ...
Page 33: ...33 SB168 ES DA Circuit Board Pattern side パターン側 Scale 80 100 2NA WG82960 1 1 ...
Page 35: ...35 SB168 ES DC Circuit Board Pattern side パターン側 Scale 75 100 2NA WP50900 ...
Page 37: ...37 SB168 ES DM Circuit Board Scale 80 100 Component side 部品側 3 layer 3 層 2NA WP50910 ...
Page 38: ...38 SB168 ES DM Circuit Board Scale 80 100 Component side 部品側 6 layer 6 層 2NA WP50910 ...
Page 39: ...39 SB168 ES Pattern side パターン側 DM Circuit Board Scale 80 100 2NA WP50910 ...
Page 42: ...42 SB168 ES HAAD2 Circuit Board B B 2NA WG83180 1 ...
Page 43: ...43 SB168 ES Pattern side パターン側 B B 2NA WG83180 1 ...
