GW Instek SFG-830 User Manual - Manual (Page 19)

p. 16 SFG-830
Note:
c Different sequence of the steps taken will not make any change on the execution and
the result.
d The bandwidth [SPAN] = stop frequency - start frequency
e The center frequency [ SWP CF ] = [(stop frequency + start frequency)/2]
f The start frequency [ STAR ] = center frequency of the sweep - bandwidth/2
g The stop frequency [ STOP ] = center frequency of the sweep + bandwidth/2
h The start and stop frequencies can be freely set according to the preference of different
users.
i SFG-830 can output waveform that is synchronized with its sweep function. In the
example of setting up LIN sweep, the Sweep/modulation output terminal on the rear
panel will output the waveform of ramp/1Hz.
6.11 Setup of AM Modulation
The AM modulation function offers sine, square, triangle, ramp, and arbitrary
signals.
n Select a waveform by [ ] or [ ] button in FUNCTION column.
o Use [ ] or [ ] button in SWEEP / MODULATION column to select a
modulation signal from sine, square, triangle, ramp, or ARB.
p Press [ AM ] button.
q Press [ RATE ] to set up sweep RATE/TIME (range 0.001Hz ~ 10kHz).
r Press [ SPAN ] to set the Modulation Depth (range 100%).
s Press [ MOD ON/OFF] to start performing modulation.
™
Example of the Setup of AM Modulation
To set the following conditions:
ΠModulation waveform : sine. ΠModulation rate : 100Hz.
ΠFrequency : 10kHz. ΠSignal : sine/100Hz AM modulation.
Procedure:
n Use [ ] or [ ] button in FUNCTION column to select SINE waveform.
o Press [ FREQ ], [ 1 ], [ 0 ], [ kHz ] buttons to set the frequency of the wave.
p Then use [ ] or [ ] button in SWEEP/MODULATION column to select
SINE waveform.
q Press [ AM ].
r Press [ RATE ], [ 1 ], [ 0 ], [ 0 ], [ Hz ].
s Press [ SPAN ], [ 1 ], [ 0 ], [ 0 ], [ % ] to set the modulation depth.
t Press [ MOD ON/OFF ] to start performing modulation.
Note:
c Different sequence of the steps taken will not make any change on the execution and
the result.
d SFG-830 has both internal and external modulation functions.