5. Use the arrow keys and scroll
wheel or number pad to enter
the Span/Center frequency.
To sweep from low to high frequencies, set a
positive span. To sweep from high to low
frequencies, set a negative span.
When Marker is off, the sync signal is a square
wave with a 50% duty cycle. When the sweep
starts, the sync signal will be at a TTL low and will
transition to a TTL high level at the center
frequency. The SYNC signal frequency is equal to
the specified sweep time.
When Marker is on, the SYNC signal is at a TTL
high level that drops to a TTL low level at the
marker frequency.
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