Fostex G16S - Page 24

Adjust the Azimuth and Phase Adjusting Screw for maximum reading on all 24/16 LED
bargraph meters of the recorder.
Then, set the oscilloscope to XY mode to obtain a lissajous waveform to check the phase.
Trace for vertical input alone
Trace for horizontal
input alone
Fig. 4.15
Unequal levels
If the trace length between (X) and (Y) are not the same, it means that the two inputs
to the oscilloscope are not of the same level. Correct for equal lengths by the oscilloscope
controls.
If the playback head azimuth is out of alignment, the following patterns will result:
(A small misalignment 30°
out of phase)
(A larger error 90°
outof phase)
(A big one, 180°
out of phase)
(Perfect azimuth
0°, in phase)
Fig. 4.16
As a result of phase check with a 12.5KHz signal, the adjustment is finished if the differ 
ence in phase is less than 75 degrees between tracks, and azimuth adjustment is at the
best point.
4.3.2 Input Level and Meter Level Calibration
1) Put Dolby NR ON/OFF SW to OFF position.
2) Put Input Monitor Button to ON position so that the R/P amp enters into Input Monitor
mode.
3) Plug in an audio oscillator output to the recorder rear panel INPUT jack 1 and apply a
lKHz, - lOdBV (0.3V) signal.
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