Philips PM 5775 Manual page 48

— Check that a pulse train appears during the gate pulse.
If not, adjust RV205.
— Check that the pulse width and time interval between the pulses are equal.
If necessary adjust RV204.
— Readjust RV205 so that the first pulse of the pulse train is as much as possible
equal to the other pulses of the pulse train.
— Turn REPETITION TIME, RV1, fully clockwise and set TIME/cm control of
the oscilloscope to 20 ns/cm.
— Check that the pulse width and time interval between the pulses are equal.
If necessary, adjust RV206.
The width of the first pulse may be greater than that of the other pulses with
control REPETITION TIME, S1, in position 10 ns.
. Astable multivibrator
— Connect the pulse generator PM 5775 (PM 5776) to a counter and an oscilloscope
as shown in Fig. X-2.
Pulse generator
PM5775, Sampling oscilloscope PM3400
Counter PM6630
T-PIECE BNC
UG - 274/U MA6495
Fig. X-2. Set-up for checking the astable multivibrator.
— Change the control settings of the pulse generator as follows:"
REPETITION TIME, S1 10 us
REPETITION TIME FINE, RV1_ _ fully counter-clockwise
— Set the time-base-control of the counter to a position which gives an accurate
9 us read out.
— Set the oscilloscope to 1 ys/cm.
— Check that the repetition time is 9 us + 3 °%/o.
If necessary, adjust RV203.
-- Turn vernier REPETITION TIME, RV1, fully clockwise.
— Check that the repetition time is 110 us + 3%.
If necessary, adjust RV202.