EM Test
CWS500 N2
User manual
V 3.00
26 / 38
6.1.
Control Unit
The control section includes the processing unit and the driver electronics for the high frequency section. All
signals coming from and going to the processing unit are uncoupled.
6.2.
Generator Unit
The signal generator provides all RF signals required for the operation of the amplifier. The signal generator is
controlled by serial communication from the control unit.
Modulators
The signal generator is realized with 3 built in modulators for generate
the different signals. There are one amplitude modulator (AM) and two
pulse modulators (PM)
AM
: For amplitude modulated signals
PM1
: Pulse modulator
PM2
: Superimposed pulse modulator
Figure 6.2
6.3.
High frequency Power Unit
Amplifier
This part is a class A amplifier with a nominal power of 100 watts and forced air cooling.
Bi directional coupler
The built in 200W dual directional coupler is used for measuring the
Forward power
and
Reverse power
. The coupling factor of
–40dB is
corrected by the display of the internal powermeter PM 1000
Figure 6.3
6.4.
3dB Attenuator
The 3dB attenuator is a helpful optional device to match the output of
CWS 500N2 to a 50
system and render there with the built in amplifier
more efficient. Especially by using coupling devices not from EM Test, it
may represent an non-usable arrangement.
By using EM Test recommended coupling devices, it is not necessary to
connect the attenuator. How ever in case of use, the 3dB attenuator is
connected directly to the RF output of the CWS 500N2
INPUT
=
ENTREE
OUTPUT
=
SORTIE
Fig 6.4 : ATT 3/100
The attenuator is required in some standards. However, the included amplifier will work correctly with any load.
Although the CWS 500N2 can also be used correctly without the attenuator for
high current
application the 3dB
cannot be used!
