Static Measuring Method - Philips PM5324 Instruction Manual

18
2.3.2.3. Warming-up time
To ensure a good frequency accuracy and stability it is recommended to switch on the generator h a lf an h our
before adjustm�nt is started.
2.3.2.4. Switching-off the AG C voltage
To prevent incorrect measur ing results it is necessary to switch off the AGC*·voltage of the receiver; it shou l d
b e replaced by a fixed adjusted voltage. A power supply
of a bout 1 kD. is con nected in parallel, may be used as a voltage source.
The connection point and the level of the voltage refer to the service documentat ion of the T V set. If the set
has a de layed 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 shou l d be completed with the corresponding checking and adjust ing procedure of the relevant
receiver.

2.3.3. STATIC MEASURING METHOD

Whe n 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 indicato r to an output with a lo w output impedance
Control settings of the receiver
Volume : average value
Bass : maximum
Treble : maximum
Bandwidth : minimum
Measur ing range of indicator about
(if necessary, select a lower or higher range).
If severa l outputs are available, the indicator
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
=
(e.g.
P E 4818)
00 V�
1
---J
o r a b attery, to which a potentiometer
I
Indicator
(e
RESISTOR TO REPLACE THE LOUDSPEAKER
9 PM 24031
3V �
MA8i'17
Indicator
PM 24031
(e.g
MA8208