The relation between the modulating voltage E , the output DC voltage UDC
and the output voltage deflection
�
U is :
�
U = UDC . Km. E
K
=
m
0, 27
for 32 V
models
K
0, 30
for
60 v
models
with K
=
3 , 35
m
K
=
0, 27
for
60 v
models with
m
(See s ection 3E for K Yalues).
p
p
K = 3 , 75
p
E . g. B32- 10R, , set for 24 V and modulated 2 V p-p sine-wave.
What is the modulating voltage E?
� U = l V
UDC = 24 V
K
0, 27 for 32 V models
m
Ll u
E =
---
1
D,
154
UDC Km 24. 0, 27
E is a sine-wave with 0, 154 V p-p which equals to 55 mV RMS .
Note:
1. The percentage of modulation is independent of the voltage control s etting.
2 . UDC is the output DC voltage corresponding to the actual
voltage control s etting (not to the modulated output DC voltage).
3 .
':lhe
output voltage cannot be modulated above 100
%,
or in other words ,
foe
output voltage cannot be reversed, no matte"' how high a modulation
voltage is applied. Neither should the peak output voltage exceed the
maximum nominal value.
4 .
A
void modulating voltages giving more than 100
%
modulation.
Wher;.
operating the power supply in the modulation mode, connect the
modulating voltage and the load according to figure 6 .
Adjust the voltage controls fo r the desired output DC level.
Increase the modulating voltage for the desired modulation amplitude.
H. S E R I A L O P E R A T I O N
If hlgher output voltage is desired, two or more units can be connected in
s eries, provided the maximum voltage to ground does not exceed 500 V.
The output may be positive, negative or floating (as shown in figure 8),
depending on how jumpers A and B are connected. Jumper A to ground
gives positive output; jumper B to ground gives negative output.
14
