GW Instek AFG-2000 User Manual - Manual (Page 60)

AFG-2000 Series User Manual
58
Connection
(EXT source only) For external sources,
connect the modulation
source signal to the MOD
input port on the rear
panel.
OUTPUT INPUT
MOD Counter
Trigger MOD
Note
When the source is set to EXT (external) the
carrier waveform is modulated by an external
signal. The frequency deviation is controlled by
the ±5V signal that is input into the MOD input
port. The ±5V input signal directly corresponds
to the set frequency deviation. +5V increases the
frequency by the set deviation frequency and -5V
reduces the frequency to below the carrier
frequency by the amount set by the deviation
frequency. For example: if the deviation
frequency is set to 1kHz, an input voltage of +5V
will increase the frequency to 1kHz, whilst an
input voltage of -5V will reduce the frequency
below that of the carrier by 1kHz.
Example:
Source = INT
Example: External
MOD input signal
FM output
MOD input
signal
0V
0V
+5V
-5V