GW Instek GFG-3015 - Manual (Page 31)

GFG-3015 p.27
SOURCE
SPAN
SWP CF
SYM
To select the Frequency modulation deviation by pressing buttons.
(Range ±15%).
Press to set the Duty of modulation signal (Range 90%:10%:90%).
Press to start performing frequency modulation.
Note: 1. As all frequency range (0.01Hz ~ 15MHz) of GFG-3015 are composed
of 8 frequency ranges (The details as below), When the main frequency
in FM function is set, a reasonable Span must be considered.
For example, If set the main frequency at 1.4MHz (Range 7) and set
Span at 10%, the corrected frequency vibration is from 1.26MHz to
1.54MHz and it will be over Range 7. Therefore, the FM result is faults
now, the Span must be reduced in order to get a reasonable result.
Number of Range Main Setting Frequency FM variation Range
8 1.5001MHz ~ 15.0000MHz 150kHz~15MHz
7 150.01kHz ~ 1.50000MHz 15kHz~1.5MHz
6 15.001kHz ~ 150.000kHz 1.5kHz~150kHz
5 1.5001kHz ~ 15.0000kHz 150Hz~15kHz
4 150.01Hz ~ 1.50000kHz 15Hz~1.5kHz
3 15.01Hz ~ 150.00Hz 1.5Hz~150Hz
2 1.51Hz ~ 15.00Hz 0.15Hz~15Hz
1 0.01Hz ~ 1.50Hz 0.01Hz~1.5Hz
2. Please refer to the setup of frequency modulation as the example below.
3. When the modulation signal source external is selected, the Rate, Span
(Deviation), Symmetry and source selection will disable as those
functions are workable on internal source mode only.
4. It won’t make any change on execution and result by taking different step
sequence.
5. GFG-3015 can output waveform synchronizing with its modulation
function. In the example of setting up frequency modulation, the
“Modulation output terminal” will output the waveform of sine at 1kHz.
Example of the Setup of FM Modulation
To set the following conditions:
Main function: Sine Wave. Modulation rate: 1kHz.
Main Frequency: 100kHz. Modulation Signal Source: Sine.
Main Output Amplitude: 10Vpp. Modulation Deviation: 10%.
Modulation Mode: Frequency Modulation Signal Symmetry: 50%.
Modulation Source: INT
Procedure:
Press to select SINE wave for main output.
MOD/ON
FUNC