13
LMY2-MLAB
■
INSPECTION
1.
Measuring Condition
1-1. Condition
Set LMY2-MLAB to AI8 and make an inspection by reference to the following block diagram.
Unless otherwise specified, the following conditions will apply.
・
Set GAIN at 0 dB.
・
Set GAIN for LMY4-DA at +24 dB.
・
0 dBu=0.775 Vrms
・
The output impedance of the oscillator is 150
Ω
.
・Input impedence for the oscilloscope, level meter, etc. should be 100 kΩ or more
.
・
Correct the noise measurement through an LPF with 12.7 kHz, -6 dB/OCT. (Use the average value, not the effective value.)
・
Set WORD CLOCK for AI8 at INT 48 k. However, as it is sourced through BNC from Function Generator for inspection of Fs
operation range, change over DipSW on UNC beforehand. (See Procedure 3.)
・
Since WORD CLOCK for AO8 is provided through INPUT A port, set DipSW on UNC beforehand. (See Procedure 3.)
・
Set the load for the analog output of AO8 at 600 ohm.
Make GAIN settings using DipSW on UNC circuit board. (See Procedure 3.)
The test program starts running when DipSW on each UNC circuit board for AI8 and AO8 is set in debug mode and power is
activated. For setting, see Procedure 3.
For both AI8 and AO8, use the firmware "AI8/AO8 firmware" of PMID SYSTEM SOFTWARE whose version corresponds to the following.
LMY2-MLAB
SIN oscillator
AI8
BLOCK DIAGRAM
AO8
INPUT A
OUTPUT A
68 pin cable
Clock source selection
is subject to inspection.
Function Generator
LMY4-DA
Distortion
Indicator
Int48
BNC
HEAD
PHONE
Amplifier
Version
1.70.0
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