Ramsey Electronics SG560, User Manual

Page: 9 / 24

9
BASIC USE
Setting Generator Offset:
To enter a DC offset, press the OFFSET key, then any voltage in the range of 0-5V with 10mV
of resolution. The offset is a DC component added to the AC signal. With the offset at zero
volts the AC component is centered around zero and the average voltage is zero volts. When
a DC offset is entered it is added to the waveform, moving the center up (or down) to the
level desired. Remember that
SHIFT, OFFSET will enter the offset step size. If a negative DC
offset is desired, simply switch the cables on the output jacks, positive to negative and nega-
tive to positive.
For example, TTL (Transistor Transistor Logic) circuits require a 0V to 5V square wave. With a
0V offset the SG560 will generate a –2.5V to +2.5V square wave (average is 0 volts). To get
the square wave to 0 to 5V we must add 2.5V to the AC waveform. In this case, enter an off-
set of 2.5V. To enter this value, press
OFFSET, 2, ., 5, V .
To further illustrate the uses of DC offset, look at the waveforms above. Fig. A shows a 2V
peak to peak sinewave with 0V of offset. Fig. B shows the same sinewave with 0.3V of offset
applied. 0.3VDC is added to all portions of the wave, both the peaks and the average.
Selecting a Waveform (Shape):
You have a choice of three waveforms on the SG560: Sine, Square, and Triangle. To access
and select any one of these waveforms, use the
SHAPE key. Simply press SHAPE and the cur-
sor will highlight in front of the waveform symbol on the first line of the display. Then press
the
7 (Sine), 8 (Square), or 9 (Triangle) key to select the desired waveform. The upper line of
the display will use a graphic representation of the waveform to indicate which is currently
selected.
+1.0V
-1.0V
+0.0V
Fig. A
Fig. B
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