OPERATING INSTRUCTIONS
12
6. Adjust the amplitude of the output as desired using the
OUTPUT LEVEL
control (10). Rotation of this control
varies the amplitude from maximum to 20dB below
maximum. An additional attenuation of -20dB is available by
pushing in the
-20dB
switch (5). The attenuation factors can
be combined for a total of -40dB. The maximum signal level
is 10V p-p (into 50
Ω
).
7. A DC component can be added to the output signal by
pushing in the
DC OFFSET
switch (4) to enable operation of
the
DC OFFSET
control (11). Rotation of this control adds a
positive or negative DC component to the output signal. The
DC component introduced is independent of the
OUTPUT
LEVEL
control and can be varied by ±10 volts open circuited
or ±5 volts into 50
Ω
. The DC Offset does not affect the
TTL/CMOS
output jack. The effect of DC OFFSET is shown
in Fig. 3.
Considerations
l. Counterclockwise rotation of the
COARSE
frequency
control decreases the output frequency to approximately one-
tenth of the maximum for the range selected (10:1). For
example, if the
10K
range is selected and the
COARSE
frequency control is set to full counterclockwise, the output
frequency is approximately
1 kHz
.
2. It is advisable to set the
FINE
frequency control to the
approximate center of its rotation before setting the
COARSE
frequency control. This assures that the
FINE
control will not reach its limit while trying to finalize the
frequency setting.
Figure 3. Use of DC OFFSET Control
3. The
FINE
frequency control provides approximately
±5% frequency deviation from the
COARSE
control
setting. This provides vernier adjustment to easily
set the frequency to a precise value.
