BNC 835 User Manual - Manual (Page 19)

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h) press the on/off button
The time resolution is 200 ns. Note that the sum of the dwell time and the off time must be greater or
equal to 1.0 ms. The dwell time must be at least 50
µs. The off time can be also be 0 (no off time).
When “auto” is selected, the off time is automatically adjusted such that during switching transients the
output is disabled and the sum of dwell and off time are at least 1.0 ms.
Under “repetition mode” you can select how many times the sweep should be executed by entering 1
to N times or select infinite. Selecting “Rand” will sweep the frequencies in a random manner until
terminated by user. In all cases the frequency returns to the CW frequency as soon as the sweep is
terminated.
Start and stop the sweep by pressing the ON/OFF button.
The switching transient between frequency steps depends on the step size and if internal bands of the
synthesizer are crossed. Typical switching transients are <10
µs for a <100 MHz step (no band
crossing) and <50
µs for arbitrary steps at output frequencies.
3.6.1.1 Frequency Linear Sweep
This mode sweeps linearly from start to stop frequency in constant steps. Frequency step size is
(f_stop-f_start)/number_of_points.
If start<stop then negative frequency steps are performed.
3.6.1.2 Frequency Log Sweep
This mode sweeps logarithmically from start to stop frequency in a given number of points per decade.
3.6.1.3 Frequency Random Sweep
The output frequency is selected randomly between start and stop frequency. The number of different
output frequencies is determined by the number of points selected by the user.
3.6.2 Power Sweep
To run a power sweep, enter start and stop power in dBm unit, the number of steps, dwell and off time
in milliseconds. When “auto” is selected, the off time is automatically adjusted such that during
switching transients the output is disabled and the sum of dwell and off time are at least 400
µs.
Select if the sweep should run a predefined number of times (enter desired number) or infinite times
(selecting infinite). Select ALC settings. Start and stop the sweep by pressing ON/OFF button.