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Menu items
Note: The telegram to initiate the burst is sent to register 0x34 (Burst pulses). Burst
number (Burst pulses) and repetition rate (Frequency) can be set with either the
front panel sub-menus or with registers 0x34 and 0x33 respectively.
Note: Software burst mode is not supported using CONTROL.
Ext. trigged burst:
A burst of pulses at the set repetition rate is emitted each time the leading edge
(low to high transition) of a trigger signal is detected on one of the external
trigger input ports. The rising edge of the trigger signal must reach the detection
threshold level for the port. The number of pulses in the burst is set using Burst
pulses sub-menu and the repetition rate is set using the Frequency sub-menu.
When the light source senses a positive edge at one of the trig inputs, the light
source emits a specified number of pulses (Burst count) at the specified
repetition rate.
External gate on
When a logic high level signal is detected at one of the trigger input ports, pulses
are continuously emitted at the set repetition rate. When the signal at both trigger
inputs is at a logic low level, no pulses are emitted. An output pulse truth table of
trigger inputs for External gate on and External gate off modes is shown in
Table 6.
Note: Typically, an additional pulse is emitted after the external signal drops to a
logic low level. The repetition rate is set using the Frequency sub-menu.
Note: When using the CONTROL interface, the External gate on mode is set using
the “Gated trigger mode” described on page 64. Refer also to Figure 37 showing
the input trigger signal levels and their effect on the optical output set in this
mode.
External gate off:
When a logic low level signal is detected at both of the trigger input ports, pulses
are continuously emitted at the set repetition rate. When the signal at one of the
trigger inputs changes to a high logic level, no pulses are emitted. An output
pulse truth table of trigger inputs for External gate on and External gate off
modes is shown in Table 6.
Note: Typically, an additional pulse is emitted after the external signal rises to a
logic high level. The repetition rate is set using the Frequency sub-menu.
Note: When using the CONTROL interface, the External gate off mode is set using
the “Gated trigger inverted mode” described on page 65. Refer also to Figure 38
showing the input trigger signal levels and their effect on the optical output in this
mode.
Warning: Although some operating modes can stop pulses from being generated,
the laser must still be regarded as having emission on. Stopping pulses by using
the input trigger signals in a certain combination, is considered an unsafe method
to disable emission.
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