Bnc 645 User Manual download pdf (Page 60)

Table 4.13-1

The available parameters in each burst mode.

Burst

Count

Burst

Period

Burst

Phase

Ext Trig

Signal

Polarity

Internal

√ √ √

Triggered

mode

External,

Manual

√ √

Gated mode √ √

Burst Count

The Burst Count represents the number of cycles appeared in each burst.

It is only used in the triggered burst mode. The default burst count is 1

cycle, and the range is from 1 to 50,000 cycles in 1 cycle increment. One

may also set an infinite burst count.

When the trigger source is set to internal, the waveform generator

outputs bursts repeatedly at a rate determined by the specified burst

period, which represents the time interval between the start times of two

consecutive bursts. The burst count must be less than the product of the

burst period and the waveform frequency:

BurstCount < BurstPeriod x WaveformFrequency

The waveform generator will automatically increase the burst period up

to its maximum allowable value to accommodate the specified burst

count. The waveform frequency is not affected by burst count.

The burst count does not apply in the gated mode. If a new burst count

is specified in the gated mode, the waveform generator will remember it

and use it when the triggered mode is selected.

Waveform Frequency

The waveform frequency defines the frequency of the output waveform

while trigger signal is logic true. In the triggered mode, the specified

number of cycles is outputted at the waveform frequency. In the gated

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 189 190

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Bnc 645 User Manual Page 60