Philips PM 5125 Manual page 11

SYNC. IN (BU3)
The frequency of the oscillator may be synchronised by means of an
external source connected [o the terminal BU3.
WAVEFORM SELECTOR 'Z,/
(SK2)
The sine wave generated in the oscillator is applied either to the amplifier
(via the continuous attenuator R2r) or to the squarer by means of the
selector switch SK2.
In position ~ of SK2 the sine wave signal is amplified and then fed
to the output terminal LOW Zo (BU1), to the step attenuator SK4 and to
the meter M1, which monitors the output voltage at BUI.
In position 2, of SK2 the squarer converts the sine wave signal into a
square wave signal; then the square wave signal is also applied to the
terminal LOW Zo (BU l), tothe step attenuator SK4and to the meter M,1.
AMPLfTUDE (R2r — R2rr) ~~
The amplitude of the output signala[the[erminals LOW Zo (BUI) and
600 4 (BU4) may be varied continuously by means of the double poten-
tiometer AMPLITUDE (R2r — R2tt),
STEP ATTENUATOR (SK4)
The amplitude of the output signal at the terminal 600 S2 (BU4) m4y
also be varied in steps of 20 d6 by means of the attenuator switch SK4.