Fig. 11 Using The Y Output Signal - Philips PM 3210 Operating Manual

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Fig. 11. Using the Y output signal
~— Set coupling selector LF-HF-DC (SK 2) to DC or HF to
obtain stable triggering.
~ Adjust LEVEL (R1) so that the sweep starts for both
signals on the horizontal centre line of the graticule.
The frequency can now be adjusted to the desired value
by making the end of the fifth cycle coincide with the
end of the second cycle of the known frequency, as shown
in Fig. 11.
This method is extremely accurate since measurements are
independent of time-base inaccuracies.