GW Instek GFG-3015, User Manual, Page: 38 / 55

p. 34 GFG-3015
KHz/Vrm
s
Hz/Vpp
6.16 THE VCF Function
The GFG-3015 also provides the function of Voltage control frequency (VCF).
Input a voltage from 0 to 10V to the instrument can change the main output
frequency. In other word, put a different input voltage will get a different main
frequency.
Basically, If user put a voltage that from 0 to 10V to instrument then the variation
of main frequency will over 100 times. But that just appear in Same “Frequency
variation Range”. Because whole frequency range (0.01Hz ~ 15MHz) of
GFG-3015 is composed of 8 frequency range (The detail is as below). So User’s
voltage just can control at same frequency range.
For example, User can’t make the main frequency to 10kHz on range 7 by VCF
input voltage. It must change to range 6 or 5.
Number of Range Setting Frequency Range
VCF Frequency 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
The input voltage must be input with VCF BNC connector. If need to change
“The frequency variation range” , proceed 6.3 The Setup of Frequency to
modify the main setting frequency.
Example of the Setup of VCF
To set the following conditions:
Main function: Sine Wave.
Main Output Amplitude: 10Vpp.
Hope that Main output will output
10kHz on External VCF function.
Procedure:
Press to select SINE wave for main output.
Press in sequence.
Then press in sequence to
choose suitable main output frequency for corresponding “ VCF Frequency
variation Range”.
Input about DC 9V to “
VCF input BNC connector”.
You will get about 10kHz sine signal from Main Output connector.
Also, you can get 10kHz from VCF frequency variation range with the same
procedure as above description by setting different value of input VCF
voltage.
Please refer to the following:
FUNC
FREQ 5
1 0 AMPL
1 0