5.2.5 Features
Voltage Controlled Frequency
Output frequency can be varied with an external input from the VCF input Terminal (16).
For 0 ~ 10 V DC VCF input voltage, the frequency is changed by 1:2, depending upon activation of the frequency
range select switch (26). To operate the VCF function, turn the frequency control knob (24), fully CCW, and connect
the external voltage to the VCF input terminal.
Amplitude Control
The maximum amplitude of output voltage is more than 20 V under the open load, but it is reduced by half (50 %)
under the 50
Ω
load or 600
Ω
load. The amplitude output voltage can be varied continuously with operating the
Amplitude control knob (19), in the range of -20 dB. If the Amplitude Control Knob is pulled out, the output signal is
set to the -20 dB fixed.
OFF-SET Control
The DC level of output signal can be varied continuously with operating the OFF-SET control knob (20) in the range
of ± 10 V. To adjust the DC level, pull out the OFF-SET control knob then, turn slowly CW (positive volt) or CCW
(negative volt). If the OFF-SET control knob is pushed in, there is no DC level, but only AC voltage exists in the
output signal.
Symmetry Control
The duty cycle of output signal can be varied continuously with the symmetry control knob (21) in the range of 1:3 or
3:1. To adjust the symmetry of the waveforms, pull out the symmetry control knob, then turn it slowly to the CCW
direction. The following table shows such variations under this mode.
Note:
After setting the symmetry control knob (21), the output frequency will decrease and the operator should re-
adjust the frequency.
Sweep Control
To enable the internal frequency to sweep, pull out the sweep width control knob (22). The width of the frequency
sweep can be varied continuously in the range of 100 : 1. To maximize the sweep width, set the frequency control
dial (24) fully to the CCW direction, and turn the sweep width control knob fully to CW.
To adjust the rate of frequency sweep, turn the sweep rate control knob slowly CW or CCW or linear frequency
sweep. Logarithmic frequency sweep mode is operative with by pulling the sweep rate control knob (23).
TTL Output
The TTL level signal output is available at the TTL output terminal (17). The TTL output can drive 30 unit loads in the
HIGH state and 20 unit loads in the LOW state. One unit load in the HIGH state is defined as 40 µA and 1.6 mA in the
LOW state.
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