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Using The Marker Controls
short tutorial on the use of the Marker controls on the MAX-038-Based
Sweep/Function Generator With Markers.
There are two marker position controls
(hereafter called simply “marker controls”), Marker 1 and Marker
2, which are R43 and R44 respectively. The Marker controls are
identical in function. Since they utilize the same marker circuit,
only one can be used at a time.
The M1 and M2 buttons determine which
of the marker controls is active. Pressing M1 enables the Marker 1
control and disables the Marker 2 control. Pressing M2 enables the
Marker 2 control and disables the Marker 1 control.
The marker controls serve two
functions. One function is to control the frequency of the oscillator
when in “Marker Mode” and the other function is to attenuate the
Waveform Output when the generator is producing the frequency to
which the currently active marker (Marker 1 or Marker 2) is set.
Several of the controls on the
instrument can affect the Waveform frequency. Pressing the “Marker
Mode” button makes the currently active marker control (Marker 1 or
Marker 2) control the Waveform frequency. Other Waveform frequency
controls are selected by pressing Low Freq, Sweep, or High Freq.
To set a marker frequency, press Marker
Mode and select Marker 1 or Marker 2. Adjust the Waveform frequency
by selecting the band and adjusting the actiove marker control
(Marker 1 or Marker 2). When the Marker On/OFF button is pressed,
the marker attenuation of the Waveform frequency is toggled. When the
Waveform frequency is being swept, the marker will put a notch in the
This makes it easy to identify a
particular frequency in the sweep. There are two marker controls
which allows a little flexibility in that one can mark two different
The Marker Output of the sweep
generator can also be used to indicate a frequency’s position
within a sweep. The Marker output is shown as the blue waveform in
the photograph above.
The Marker can also be used
to identify the frequency of an interesting feature, such as a peak
in response. In the photograph below, the Marker is set at the peak
response of a ceramic filter being swept.
In this case, the Marker control was
adjusted so that the Marker Output was aligned in time with the peak
in the filter’s response. After setting the position of the marker,
the Marker Mode button was pressed, which stopped the sweep and the
Waveform frequency is set to the Waveform frequency that corresponded
to the center off the marker pulse (the blue pulse in the photograph
above). The Waveform frequency was then measured to determine the
Contents ©2008 Richard Cappels All Rights Reserved. Find
LCD library copyright by Peter Fleury http://homepage.hispeed.ch/peterfleury/
and may only be used for noncommercial purposes and is provided here
with his permission.
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