BNC 555 Series, User Manual, Page: 13 / 47

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Basic Operation
Overview
The Model 555 Pulse Generator is designed to provide maximum flexibility, while maintaining a
simple interface. A basic understanding of the architecture of the instrument will aid in fully
exploiting its capabilities. Referring to the figure above, the timing generator is divided into two
sections: the Internal System Timer & Mode Generator and the Channel Timer & Mode
Generator.
The Channel Timer functions as a 'non-retriggerable, delayed, one shot' pulse generator. This
means that the timer will only generate one delayed pulse for every start pulse received. Once
the channel timer has started counting, additional start pulses will be ignored until the pulse has
been completed (nonretriggerable). The start pulse for each channel is provided by the internal
To pulse generated by the Internal System Timer. Whether or not a pulse is generated for each
To pulse is determined by the Channel Mode Generator. Standard modes include:
Normal a pulse is generated for each To pulse
Single Shot a pulse is generated at the first To pulse
Output
Pulses
Output
MUX
Internal
To Pulse
External
Input
Arm
Start
*
Gate
To
Internal System Timer
and System Mode
Generator
Channel Timers and Channel
Mode Generators
* Start source is: RUN button in Internal Modes
External input i n External trigger modes
** Channels are armed by the RUN button. In single shot andburst modes
channells may be rearmed by pressing the RUN a second time.
RUN
Command
**
Start
Gate
Arm
*Start source is: RUN button in Internal Modes
External input in External Trigger modes
**Channels are armed by the RUN button. In single shot and burst modes
channels may be rearmed by pressing the RUN button.
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