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f) OFFSET adjustment
- The DC voltage level of the output signal can be adjusted with the
OFFSET control knob in the range of +/- 10 V.
- To set the DC voltage level, pull this control knob out. Turning to
the right means positive voltage, turning to the left means negati-
ve voltage.
- If the control knob is pressed, the output voltage will have no DC
voltage component.
g) Symmetry adjustment
- The symmetry of the output voltage can be changed in the range of
1:3 and 3:1.
The control knob carries the designation SYM.
- To change the symmetry of the waveforms, pull the SYM control
knob and turn it slowly to the left (ccw) or to the right (cw). Refer
to the table for the resulting waveforms.
BASIC WAVEFORMS
CLOCK WISE (CW)
SINE
SQUARE
TRIANGLE
Note!
Note that because of this adjustment of symmetry, the frequency can
change and therefore should be readjusted.
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COUNTER CLOCKWISE (CCW)
SKEWED SINE
SKEWED SINE
PULSE
PULSE
SAWTOOTH
SAWTOOTH
h) SWEEP adjustment (Wobbler)
- To operate the built-in frequency sweep, pull the SWEEP WIDTH
control knob and use it to adjust the width of the sweep signals in
the range 100 : 1.
- To achieve maximum width, turn the frequency adjustment knob
(with scale) to its left stop and the width control to its right stop.
- To adjust the speed of the sweep signal, turn the SWEEP RATE con-
trol knob slowly to the left or right. A linear sweep signal is obtai-
ned.
- A logarithmic sweep signal is possible by pulling the SWEEP RATE
control knob.
i) TTL output
- The TTL level is available at the TTL OUT socket (BNC).
A TTL level is an "asymmetric square wave". It is asymmetrical
because, in contrast to the sine or "pure" square waves, the signal
does not cross zero, i.e. it has no negative voltage values (negative
logic excepted).
- The TTL output can drive 20 "unit loads" when HIGH and 15 "unit
loads" when LOW.
- One "unit load" is 40 µA for the HIGH and 1.6 mA for the LOW
state.
j) Output impedance
- The output impedance of the generator output F/G OUT, is 50 Ohm
or 600 Ohm depending on the setting of the 50 / 600 Ohm switch.
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