Voltage-Controlled Frequency Setting "Vcf - VOLTCRAFT FG 8210 Notice D'emploi

Never exceed the max. input values, neither at the VCF-input nor at the frequency counter input,
and avoid a short circuit at the generator outputs "TTL-SYNC" and "OUTPUT". Otherwise, there is
the danger of damage or even destruction of the frequency generator.
When the max. input values are exceeded or voltages above 50 V/AC or 75 V/DC are touched,
there is the danger of a potentially fatal electric shock.
8.5 VOLTAGE-CONTROLLER FREQUENCY SETTING "VCF"
The generator's output frequency can be set by application of an external voltage up to 10 V in the form of a fixed or
variable direct or alternating voltage.
The different voltage types are described in the following chapters.
By application of an external voltage in the range of 0 to 10 V at the VCF input (5), the output frequency can be
changed at the ratio of up to 10:1. However, this depends on the respective position of the frequency range switch
(13).
When applying an external direct voltage to the VCF socket, always observe polarity, "+" inside.
The output frequency is enlarged by application of a voltage. However, only the maximum frequency of the selected
range can be set.
If, e.g., the range "1M" is set and the two adjustment
buttons "FREQUENCY" are set to the "MIN" position
while there is no voltage at the VCF input, the generator
display shows approx. 100 kHz.
If you now apply a direct voltage to the VCF-input (5) and
slowly adjust them up to 10 VDC, a frequency of approx.
10 MHz will finally be displayed at 10 VDC. An additional
adjustment of the adjustment button "FREQUENCY"
brings no further frequency increase.
Push the switch "1k" in the field "FREQUENCY RANGE" at the generator. Turn the adjustment button "FREQUEN-
CY" until 5 kHz is displayed. By application of a voltage in the range from 0 to 10 V at the "VCF IN" input (5) only
permits setting or enlargement of the frequency at the output (7) up to approx. 10 kHz.
Turn, e.g., the voltage at an adjustable mains unit slowly up to 10 V. The frequency at the generator output changes
proportionally to the VCF-input voltage.
If the adjustment button "FREQUENCY" is already in the MAX area, only a very small voltage-controlled frequency
change is possible.
34
Control voltage VCF
0
1
2
3
4
5
6
7
8
9
10
Range factor
0,1
1
2
3
4
5
6
7
8
9
10