BNC 645 - Manual (Page 55)

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Sweep Mode
The default sweep mode is linear where the waveform generator sweeps
the frequency with spacing calculated in a linear function. In logarithmic
sweep mode, the waveform generator sweeps with spacing calculated in
a logarithmic function.
Start Frequency and Stop Frequency
The waveform generator begins sweeping from the start frequency to
the stop frequency. The waveform generator will sweep down when the
start frequency is greater than the stop frequency. The waveform
generator will sweep up when the stop frequency is greater than the
start frequency.
The default start frequency is 100 Hz and the stop frequency is 1 kHz.
The allowable range is 1 μHz to 50 MHz for sine
, 1 μHz to 25 MHz square,
1 μHz to 200 kHz for ramp, and 1 μHz to 10 MHz for arbitrary waveforms.
Center Frequency and Frequency Span
Center frequency and frequency span provide another way to set the
frequency sweep range. The default center frequency is 550 Hz. The
allowable range is 1 μHz to 50 MHz for sine, 1 μHz to 25 MHz for square,
1 μHz to 200 kHz for ramp, and 1 μHz to 10 MHz for arbitrary waveforms.
The default frequency span is 900 Hz. The allowable range of the
frequency span is depending on center frequency setting and waveform
selection. Set positive frequency span for sweeping up and negative
frequency span for sweeping down.
Sweep Time
The sweep time is the period of time (in seconds) required to sweep from
the start frequency to the stop frequency. The number of discrete
frequency points is calculated by the waveform generator according to
the sweep time specified. The default sweep time is 1 second, and the
range is from 1 ms to 500 s.
Marker Frequency
Marker frequency provides a way to control the Sync signal outputted on
the front panel Sync connector. For sweeps with Marker On, the Sync