Operator’s Manual Simple AFG Application
59
Marker out (blue, top) synchronous with the modulating waveform of the AM (red, bottom)
Modulation General Parameter
•
Frequency [Hz]:
it defines the modulating frequency. It can vary between 500 uHz and 50 MHz.
•
Source:
the source can be
Internal
or
External
. If
Internal
is selected it is possible to select a
Shape. If
External
is selected the instrument accepts a modulating signal from the
Ext. Mod.
SMA connector.
Modulation Types and associated parameters
•
Amplitude Modulation (AM):
the amplitude of the carrier waveform is modulated following the
modulating shape. It is available for all functions except for the Pulse, Double Pulse, DC level and
Noise.
The parameter
Depth [%]
controls
the modulation depth between 0% and 120%.
•
Frequency Modulation (FM):
the frequency of the carrier waveform is modulated following the
modulating shape, it is available for all functions except for the Pulse, Double Pulse, DC level and
Noise.
The parameter
Deviation [Hz]
defines the deviation of frequency with respect to the carrier
frequency. The Deviation is between 0 Hz and the maximum frequency that satisfies the
following 2 relationships:
-
𝐶𝑎𝑟𝑟𝑖𝑒𝑟 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 − 𝐷𝑒𝑣𝑖𝑎𝑡𝑖𝑜𝑛 > 0 𝐻𝑧
-
𝐶𝑎𝑟𝑟𝑖𝑒𝑟 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 + 𝐷𝑒𝑣𝑖𝑎𝑡𝑖𝑜𝑛 ≤ 𝑀𝑎𝑥𝑖𝑚𝑢𝑚 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦
Where the Maximum Frequency depends on the selected carrier.
For example, for a sine function at 200 MHz the Deviation must be below 200 MHz.
•
Phase Modulation (PM):
the phase of the carrier waveform is modulated following the
modulating shape. It is available for all functions except for the Pulse, Double Pulse, DC level and
Noise.
The parameter
Deviation [deg]
set the maximum phase deviation of the carrier waveform. It
can vary in the range 0 to 360 degrees.
