Bnc 645 User Manual download pdf (Page 62)

point, the output will remain at the same voltage level as the starting

burst phase.

Trigger Source

The default trigger source is internal, and the available options are

internal, external and manual. When the waveform generator is set to be

in the triggered burst mode, it generates a burst with specific number of

cycles each time a trigger is received. Then it stops and waits for the next

trigger event to occur. When the trigger source is internal, the bursts are

outputted at a rate determined by the burst period. When the trigger

source is manual, the burst is outputted only when the Trigger button is

pressed.

When the trigger source is external, the waveform generator outputs a

burst each time a TTL pulse with specified polarity is received at the

Ext

Trig

connector on the rear panel. A received trigger signal is ignored

during the output of a burst.

When the trigger source is set to be external or manual, the burst count

and burst phase remain the same but the burst period is ignored.

Trigger Out Signal

In internally or manually triggered burst mode, one may enable to output

trigger out signal at the Ext Trig connector on the rear panel that is

synchronized with the burst output. When enabled, a TTL-compatible

square waveform with either a rising or falling edge is outputted at the

Ext Trig

connector at the beginning of the burst. The trigger out signal is

not available in the externally triggered burst mode as an external

trigger signal is applied to the same Ext Trig connector.

With internal trigger source, the trigger out signal is a square waveform

with 50% duty cycle. With manual trigger source, the trigger out signal is

a pulse with pulse width > 1 μs.

How to set up burst output

1. Press one of the function buttons to select the burst waveform (dc

is not allowed and noise is allowed only in the gated burst mode).

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Bnc 645 User Manual Page 62