Square Wave Response Of The Y Amplifier - Philips GM 5605 Manual

40 Checking and adjusting
4. Step attenuator
Check the attenuation with SK3 in the following positions (R6 fully
clockwise):
Position SK3
.01 Vp_p/div.
.03 Vp-p/div.
.1 Vp-p/div.
.3 V
p
-p/div.
1 Vp-p/div.
3 V
p
-p/div.
10 V
p
-p/div.
30 Vp-
p
/div.
Voltage on BU2 Picture height
28.25 mV
r
.
m
,
s
.
84.75 mV
r
,
m
.
s
.
0.2825 V
r
.
m
.
8
.
0.8475 V
r
.
m
.
s
.
2.825 V
r
.
m
.
8
.
8.475 V
r
.
m
.
s
.
28.25 V
r
.
m
.
s
.
84.75 V
r
.
m
.
s
.
7.8 div.-8.2 div.
5. Continuous attenuator
Turn R6 fully clockwise.
- Apply a sinusoidal voltage to BU2 of a frequency of 2 kc/s and an
amplitude such that the picture height amounts to 3.5 divisions.
Turn R6 fully anti-clockwise.
The picture height must now lie between 0.7 and 1 division.
6. Square wave response
- Turn R6 clockwise.
- Set SK3 to position ".01 V/div."
- Apply a square wave voltage of a frequency of 2 kc/s to BU2.
The picture height must amount to approximately 8 divisions.
- Compare the square wave response with Fig. 18.
E112
Fig. 18, Square wave response of the Y amplifier