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PD-T503
Oscilloscope Setting
Meer
Check Items/
Test Points
AdjusGng
Adjustment
Adjustment Procedure
FOCUS GAIN ADJUSTMENT
With
the
oscillator
power
turned
OFF,
connect the oscilloscope and oscillator as
shown in Fig. 9-13.
Set to normal PLAY mode.
Turn ON the power of the oscillator and set
it to output a 1.2 kHz 1 Vp—p signal.
Note: Some
oscillators
discharge
a
DC
voltage when power is turned on. !n that
case it is recommended to connect the
oscillator after it has been turned on.
CH1 (X) , CH2 (Y)
X-axis
VR3
Phase difference
| ¢ Adjust VR3 FCS.GAN
(focus gain) so that
20 mV/div, 5 mV/div
TP1 Pin 5
(FCS. GAN)
of 90°
the Lissajous figures form a horizontal circle
(probe: 10:1)
(FCS. IN)
on the oscilloscope
(phase difference of
90° ).
Y-axis
TP1 Pin6
(FCS, ERR)
Pin 5
zs
CFCS. IN)
Pin 4
(GND)
Pin 6
c
(FCS. ERR)
"High gain
-
~ Optimum gain
Low gain
Photo 9-10.
Photo 9-11.
Photo 9-12.
40
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