33
MW12
4.4
Check of output voltage of ‘IC102’
The voltage of TP101 shall be within the range of 3.6V to 3.85V.
4.5
Inspection of analog characteristic
Note: Set the volume control of WINDOWS to MAX.
4.5-1 Gain, Distortion factor
Input the signal to the input terminal according to Table 4.5-1,and record to the personal computer by way of USB.
Play back the recorded file by way of USB. At the time the output levels shall be within the range specified in the
Table 4.5-1.
* Distortion is measured with 200Hz high pass filter and 20kHz low pass filter.
4.5-2 Frequency Characteristic
In the signal routes of the 4.5-1, the 20Hz frequency response of each output shall be within the range of 0 dB +1/
-1 dB compared to the 1kHz (0dB) .
The 20kHz frequency response of each output shall be within the range of 0 dB -3/-10 dB compared to the 1kHz
(0dB).
4.5-3 Noise level
In the signal routes of the 4.5-1, the input terminal is connected with GND, it records by way of USB, and it play
back by way of USB. The noise level must be -60dBu or less, at the time.
* Noise is measured with a 12.7kHz -6dB/octave low pass filter.
4.6
Example of setting USB Audio application software (Cubase LE for Windows)
Input
L output
R output
Terminal
Frequency
Level Level Distortion
* Level Distortion
*
L input
1kHz
+18
+18 +/-2
0.05% or less
-30 or less
--
R input
-30 or less
--
+18 +/-2
0.05% or less
Table 4.5-1[dBu]
Installing Cubase
1.
To prevent the playback sound from
Cubase LE from being directly re-recorded,
press the MW12 2TR IN/USB(ST/TO C-R)
switch so that it’s in the on ( TO C-R)
position.
With the setting the playback sound can be moni-
tored via the C-R OUT connectors as well as the
PHONES jack.
When connecting or disconnecting the USB cable
be sure to turn the 2TR IN/USB control all the way
down.
Disconnect the USB cable before you use the
computer without the MW12.
USB Connection Precautions
Be sure to observe the following points when connecting to the
computer’s USB interface. Failure to observe these rules can
result in computer freezes/hang-ups and possibly data loss or
corruption.
If the computer or MW12 does stop operating properly, turn
the power off and then on again, and restart the computer.
• Be sure to wake the computer from
sleep/suspended/standby mode before making a
connection to the computer’s USB connector.
• Connect the MW12 to the computer before turning the
MW12 power on.
• Always quit all applications running on the computer
before turning the MW12 power on or off, or connecting
or disconnecting the USB cable.
•
•
Wait at least 6 seconds between turning the MW12 on or
off, and between connecting or disconnecting the USB
cable.
