Pyrocam IV Operator’s Manual Document No. 50337-001 Rev F 2/21/2017 Page 16
problems. There is some built-in hysteresis between the trigger mode thresholds,
so approach the boundary points from the side most desirable.
NOTE: An Ultracal MUST be performed for all pulsed trigger modes.
NOTE: Unstable periodic trigger pulses will result in timing jitter from one pulse to the
next. When negative Delay settings are required to insure capture of very short
pulses, excessive jitter can cause the pulse to miss being captured. Therefore high
trigger pulse frequency stability is most needed for very short laser pulses.
3.3.2 Pulse Mode Setup Procedure
Pulse mode is enabled by selecting Pulsed in the Trigger Method panel. Connect a
trigger source to the TRIGGER connector. See APPENDIX A for trigger pulse electrical
requirements. The YELLOW Trigger LED will illuminate when trigger pulses are applied
to the Pyrocam.
NOTE: Pulsed operation is the default operating mode for the Pyrocam on
power up. This is important to consider since users may start BeamGage with no
trigger pulses present. This results in the camera sitting idle and not collecting
frames, which could be confused as the camera not operating correctly.
The Delay setting is adjusted based on the selected operating mode and is described in
the following Mode descriptions.
3.3.2.1 Trigger Rate Stability
Trigger rate stability is required for pulsed modes 2 and 3. For best results, the trigger
pulse repetition rate should be stable to within ±200µs. The Pyrocam will monitor the
current trigger rate and compare it to the rate recorded during the last Ultracal cycle.
The Ultracal status bar indicator will change from GREEN to RED if the
trigger rate changes significantly from the rate used during the Ultracal cycle. This
change to RED will revert to GREEN if the previous trigger rate is restored.
The following notations are used in the timing diagrams and equations:
(program in Trigger Method)
(program in Exposure|Gain)
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