Philips PM 5125 Manual page 31

35
Position Setting of the Voltage behveen the
of SK3 frequency dial terminals BU4 and BU7
x 1 10 between 9.8 and 10.2
Vrma
x 10 10
between 9.9 and 10.1
Vrmx
x 103 100
between 9.9 and 10.1 Vr,°e
x 104 50 between 9.8 and 10.2
Vrms
x 104 100
between 9.8 and 10.2 Vr°, e '
F. DISTORTION OF THE SINE WAVE
1. — Connect a load of 600 S2 ~ 1% to the terminals BU1 and BU2.
— Connect a distortion meter to the terminals BU4 and BU7.
— Set switch SK3 to position x 10, set switch SK2 to position ~, set
the attenuator R2 fully clockwise and set the frequency dial to
position 10.
— Adjust the distortion to between 0.09% and 0.11% by means of
trimmer R45.
2. —Check the distortion at the following settings of switch SK3 and of
the frequency dial.
Position of
switch SK3
Setting of the
frequency dial
Distortion
x 1 10
< 0.25%
x 103
100
<
0.3
x
l04 60
~ 1%)*
G. SQUARE WAVE VOLTAGE
1. —Set switch SK2 to position ~,.
— Set switch SK3 to position x 102.
— Set attenuator R2 fully clockwise.
— Set the frequency dial to position 50.
— Set switch SK4 to position 0 dB.
*
lj
the distortion at 600 kHz is larger Than 0.6%, another value should be
selectedjor C84.
This value
should be selected in such a way that na instability occurs, when a capacitive load of 100 pF is con-
nected to terminals BUI and BU2.