Tektronix 502A, Instruction Manual

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Operating Instructions—Type 502A
Fig. 2-6. Location of locking sleeve and knurled parts on the Type P6006 Probe.
the probe body until a flat top is obtained on the square­
wave waveform. The locking sleeve should now be tight­
ened. After the locking sleeve has been tightened, the probe
compensation should be checked once more to insure that
the compensation did not change when the locking sleeve
was tightened.
Triggered Operation
In order to obtain a stable display of some recurrent
waveform, it will be necessary for you to trigger the hori­
zontal sweep at the correct instant of time. This will in­
sure that the sweep will start at the same point on the ob­
served waveform for each cycle of operation. The sweep
should be triggered either by some waveform bearing a
fixed time relationship to the observed waveform or by the
observed waveform itself. Either method will produce the
desired stable display. If the waveform which is applied to
the UPPER BEAM and the waveform which is applied to the
LOWER BEAM have a definite time relationship to each
other it is possible to trigger from either beam and obtain
simultaneously a stable display of both waveforms.
The following instructions tell you how to select the
proper triggering signal for various applications of your
oscilloscope. These instructions also provide information
about the advantages and limitations of each triggering con­
figuration. You should attempt to become thoroughly familiar
with all of the various triggering configurations in order
that you may obtain maximum use from your instrument.
A thorough knowledge of the triggering configurations will
allow you a greater selection of triggering methods when
you are
confronted with a definite triggering problem.
How
to select the triggering signal source
1. To trigger the sweep from the waveform displayed on the
UPPER BEAM, set the TRIGGER SELECTOR switch at UPPER
AC or UPPER DC.
2. To trigger the sweep from the waveform displayed on the
LOWER BEAM, set the TRIGGER SELECTOR switch at LOWER
AC or LOWER DC.
3. To trigger the sweep at the power line frequency, set
the TRIGGER SELECTOR switch at LINE. This mode of trig­
Fig. 2-7. The Type P6006 Probe is adjusted for a flat-topped square-wave display of the Calibrator waveform.
2-4