PeakTech 4120 Bedienungsanleitung Seite 28

OFF-SET Control
The DC level of output signal can be varied continuously with operating the OFF-SET control knob (11, Fig. 1) 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 (10, Fig. 1) 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 (10, Fig. 1), 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 (9, Fig. 1). 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 (16, Fig. 1) 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 (14, Fig. 1).
TTL Output
The TTL level signal output is available at the TTL output terminal (15, Fig. 1). 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.
Output Impedance
Output impedance of the function generator can be changed with the 50 Ω or the 600 Ω by pressing or releasing the
output impedance select switch (20, Fig. 1).
Under activation of the 600 Ω mode, the output frequency in normal waveform is available in the range of 1 Hz to
100 kHz.
6.3. Operating the DC power supply
Check the line voltage and fuse ratings before connecting input power. Do not short "+" and "-" output terminals.
Avoid a heavy shock to this instrument. For continued protection against damage, do not connect loads below 2.5 Ω
to the Terminal (34, Fig. 1) and below 15 Ω to the Terminal (37, Fig. 1).
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