Ophir Optronics Ltd QSR Manuel D’Utilisation

This chapter provides an overview and instructions for working with External 
Triggers and Missing Pulses. These are supported only by the Pulsar device.  

Topics in this chapter include: 

• 
• 
• 
• 
• 

• 
• 
• 
• 

• 
• 

The Pulsar device includes an External Trigger BNC connector, which can be 
used as an external trigger input or output when using energy detectors 
(pyroelectric or PD10 heads).  

When configured as an input, a signal can be connected from the sync output of 
a laser or laser-system to the BNC connector. It can be used to detect and log 
missing pulses, or to lock out and ignore specific pulses or groups of pulses that 
are not interesting.  

When configured as an output, the signal can be used to trigger external 
circuitry in sync with pulses on the head detector.

 

The External Trigger input characteristics: 

Can be driven by any digital signal, TTL or CMOS, 3.3v or 5v logic. 

Can tolerate input voltages between 10v and -10v. 

A voltage is considered high when it is 2.4v or greater. 

A voltage is considered low when it is 0.6v or smaller. 

The External Trigger output characteristics: 

Drives ~3.3v high level. 

Drives ~0v low level.