15
LMY2-MLAB
2-3. Difference in Each CH Level (Both CH1A and CH2A)
Specify the range of the gain difference at 1 kHz measured in the above 2-2 as follows.
2-4. Residure Noise (LPF: 12.7 kHz) (Both CH1A and CH2A)
2-5. EIN (LPF: 12.7 kHz) (Both CH1A and CH2A)
However, outside the above tolerance level the measuring value - (gain at 1 kHz)
-128.
2-6. Stroke Between CH1A and CH2A (1 kHz)
Check by inputting a signal to CH1A under the following condition. (Check for CH2A in the same manner.)
2-7. SIGNAL LED Lighting Level CH2A (1 kHz)
Check that SIGNAL LED comes on and goes out at the following input level.
2-8. Phantom Voltage (All of CH1A, CH1A and CH2B)
Set DipSW to PHANTOM ON on the circuit board and activate PHANTOM MASTER.
Check that when a resistor of 10 k ohm is connected between 2-pin and 1-pin of XLR with 2-pin and 3-pin short-circuit, the voltage
between 2-pin and 1-pin is 34 to 38 Vand that an electric discharge occurs immediately when PHANTOM MASTER is off.
2-9. Fs Operating Range (Both CH1A and CH2A)
q
Fs=51.2 kHz
（
48 kHz +6.5%
）
・
Set Function Generator for 51.12 kHz.
・
Check that the output level listed below can be achieved.
w
Fs=39 kHz（44.1 kHz -10%）
・Set Function Generator for 39.69 kHz.
Make the same inspection as in
q
and check that the same output level can be achieved.
Tolerance leveo
less than -67 dBu
Condition
Input 150
Ω
shorted
for CH2A
CH1A input level
+23 dBu
AI8 GAIN setting
0 dB
Specified range
Within 1 dB
Tolerance level
less than -79 dBu
less than -95 dBu
Condition
Input 150
Ω
shorted
Input 150
Ω
shorted
AI8 GAIN setting
36 dB
0 dB
Tolerance level
Comes on
Goes out
Input level
-8 dBu
-13 dBu
Tolerance level
less than -50 dBu
Condition
Input 150
Ω
shorted
AI8 GAIN setting
78 dB
Tolerance level
+23
±
1.0 dBu
Input level
+23 dBu
Input frequency
1 kHz
AI8 GAIN setting
0 dB
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