Philips PM5324, Instruction Manual

Page: 19 / 60

18
2.3.2.3. Warming-up time
To ensure a good frequency accuracy and stability it is recommended to switch on the generator half an hour
before adjustm�nt is started.
2.3.2.4. Switching-off the AGC voltage
To prevent incorrect measur ing results it is necessary to switch off the AGC*·voltage of the receiver; it should
be replaced by a fixed adjusted voltage. A power supply (e.g.
P E 4818)
or a battery, to which a potentiometer
of about 1 kD. is con nected in parallel, may be used as a voltage source.
I
The connection point and the level of the voltage refer to the service documentation of the T V set. If the set
has a delayed AGC, it is a lso possible to measure correctly, only if the input signal supplied is so small that the
AGC does not operate yet.
2.3.2.5. Documentation of instruments
The data given should be completed with the corresponding checking and adjusting procedure of the relevant
receiver.
2.3.3. STATIC MEASURING METHOD
When the measurements are performed following the static method, the test object is checked point by point.
The con necting l ine of these points results in the band-pass curve.
Depending on the output circuit the indicator (output voltage meter) must be con nected according to Fig. 9
or 10.
Measuring range of indicator: 3 V�
(if necessary, select a lower or higher range).
Fig. 9. Connection of the indicator to an output with a lo w output impedance
Contro l settings of the receiver
Volume
Bass
Treble
Bandwidth
: average value
: maximum
: maximum
: minimum
Measuring range of indicator about
1
00 V�
(if necessary, select a lower or higher range).
If several outputs are available, the indicator
---J
should be connected to the bass chan nel.
Fig.
10.
Connection of the indicator to an output with a high output impedance
AGe
=
Automatic gain control
Indicator
(e
9
PM 24031
3V�
RESISTOR TO REPLACE THE LOUDSPEAKER
MA8i'17
Indicator
( e . g
PM 24031
MA8208