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40
4,3.
4.3.1.
4.3.2.
4.3.3.
CHECK AND ADJUSTMENT
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 time 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.
).
The following abbreviations are used for setting and measuring instruments:
x
= Button pressed
_
= Button not pressed/unlocked
fe)
= Button only tipped
rh
= extreme right-hand position
Ih
= extreme lift-hand position
m
= mid-position
ml
= position in the middle between m and Ih
OSC
= Oscilloscope
e.g. PM 3055
Cc
= Counter
e.g. PM 6665
Fg
= Function generator
e.g. PM 5132
DA
= Distortion analyzer
e.g. HP 333 A
DM
= Digital multimeter
e.g. PM 2534
50 2
= 50 Q terminating resistor
e.g. PM 9585
Preparations
General functional test
—
Control the TTL output.
—
Roughly control the output voltage at the SWP VOLTAGE
socket during the internal sweep.
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