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4.3.
CHECK AND ADJUSTMENT
4.3.1.
General
The limits mentioned in this paragraph are valid only for a newly adjusted instrument and therefore might
deviate from the values as stated in paragraph 1.2. "Technical Data".
Adjustment of the instrument is only permitted after a warm-up hme of at least 30 minutes at an ambient
temperature of (+23
±
3) °C and when connected to a mains voltage of 230 V
±
5 %. The cabinet must
be closed.
The printed circuit board is mounted overhead. Nevertheless all trimming potentiometers and capacitors are
accessible from the top. For adequate temperature stability during adjustment, the cabinet should be
removed only for a short time and so far that the required adjusting element is just accessible.
If not explicitely stated otherwise, the voltage potentials refer to the relevant contact measured against
circuit earth ( j_
0 ).
The following abbreviations are used for setting and measuring instruments:
X
0
rh
lh
m
ml
D.V.M. (d.c.}
osc.
c
Fg
DA
OM
50S1
4.3.2.
Preparations
= Button pressed
= Button not pressed/unlocked
= Button only tipped
= extreme right-hand position
=extreme lift-hand position
= mid-position
= position in the middle between m and lh
= Digital voltmeter for DC measurements e.g. PM 2441
=Oscilloscope
e.g. PM 3240, PM 3260
= Counter
e.g. PM 6630
= Function generator
e.g. PM 5127
= Distortion analyzer
e.g HP 333 A
= Digital multimeter
e.g. PM 2424
= 50 S1 terminating resistor
e.g. PM 9585
All trimming potentiometers and capacitors in mid-position; (only for completely new adjustment).
Turn dial potentiometer to extreme counter clockwise position.
Position dial such that the 0.1 graduation on the dial is positioned 8 mm left to the text plate mark.
- Solder joints A, B, C, D must be closed. To be opened for failure detection only.
Terminate the OUTPUT by a 50 Ohm resistor.
4.3.3.
General functional test
Actuate all buttons one after the other for rough functional test of the generator by means of an
oscilloscope connected to the OUTPUT socket.
Control the TTL output.
Roughly control the output voltage at the SWP VOLTAGE socket during the internal sweep.
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