Bnc 645 User Manual download pdf (Page 61)

mode, the waveform frequency is outputted when the external gate

signal is true.

The default waveform frequency is 1 kHz. The range is from 1 μHz to 200

kHz for ramps, 1 μHz to 25 MHz for square, 1 μHz to 10 MHz for pulse and

arbitrary waveforms, 1 μHz to 50 MHz for Sine. In internally triggered

burst mode, the minimum frequency is 2.001 mHz. For sine and square

waveforms, frequencies greater than 10 MHz are allowed only when an

infinite burst count is set.

Burst Period

The burst period represents the time interval between the start times of

two consecutive bursts. It is only used in the internally triggered burst

mode. The default burst period is 10 ms and the range is from 1 μs to 500

seconds.

The burst period must be long enough for the generator to output the

specified burst count. If the burst period is set too short, the waveform

generator automatically adjusts it to the shortest value that can

accommodate the specified burst count and waveform frequency:

200ns

equencyWaveformFr

BurstCount

dBurstPerio +>

Burst Phase

Burst Phase defines the starting phase of a burst. The default is 0 degree

and the range is from -360 degrees to +360 degrees. You can only set

the burst phase in degree from the front panel operation, while degrees

and radians are both available from the remote interface operation.

For sine, square and ramp waveforms, zero degree is the point at which

the waveform crosses zero volt or the dc offset when ascending. For

arbitrary waveform, it is the first waveform point specified. The burst

phase has no effect on pulse or noise waveform.

In the gated burst mode, when the gate signal turns false, the waveform

generator will complete the current waveform and then stops. At this

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Bnc 645 User Manual Page 61