4.  Use the arrow keys and scroll 
wheel or number pad to enter 
the Stop/Start frequency. 
To sweep from low to high frequencies, set the 
start frequency less than the stop frequency. 
To sweep from high to low frequencies, set the 
start frequency greater than the stop frequency. 
 
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 at the start of the sweep and drops to a 
TTL low level at the marker frequency. 
The SYNC signal is output from the TRIG output 
terminal.