The output from the front-panel Strobe connector goes “high” at the
beginning of each sweep. If you have disabled the Marker function, the
Strobe signal goes “low” at the midpoint of the sweep. However, if you have
enabled the Marker function, the Strobe Out signal goes “low” when the
output frequency reaches the specified marker frequency. The marker
frequency must be between the specified start frequency and stop
frequency.
You can use the Marker function to identify a notable frequency in the
response of a device under test (DUT) – for example, you may want to
identify a resonance. To do this, connect the Strobe output to one channel
of your oscilloscope and connect the DUT output to another channel. Then,
trigger the oscilloscope with the rising edge of the Strobe signal to position
the start frequency on the left side of the screen. Adjust the marker
frequency until the falling edge of the Strobe Out signal lines up with the
interesting feature in the device’s response. You can then read the
frequency from the front-panel display of the 81150A / 81160A.
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