Dectris EIGER 2 - 9 TRIGGER and GATING Introduction; INTS - Internal (Software) Triggering

9. TRIGGER AND GATING
9.1. Introduction
Information #9
Depending on the type of EIGER2 system, the valid ranges for the trigger parameter dier.
Please consult the Technical Specications for your system. The values presented in the exam-
ples below should work on every EIGER2 system. If the settings or the external trigger/enable
pulses applied are out of specication, acquisitions will not be performed and the measurement
obtained with the detector might be incomplete.
All values used in the example are for demonstrational purposes only and should be adapted
to meet the requirements of your application.
In order to record an image or a series of images, the EIGER2 detector has to be initialized, congured, armed,
and triggered or gated. The steps necessary to record an image series are comprehensively described in
chapter 5 and section 7.2. The detector can be triggered through software (internal trigger) or by an externally
applied trigger signal (external trigger). Various dierent trigger and gating modes are available and described
in the following sections.
9.2. INTS - Internal (Software) Triggering
An exposure (series) can be triggered by using a software trigger. This is the default mode of operation.
Example detector conguration for internally triggered exposure series:
detector | cong | trigger_mode {”value”: ”ints”}
detector | cong | nimages {”value”: 10}
detector | cong | ntrigger {”value”: 3}
detector | cong | frame_time {”value”: 1}
detector | cong | count_time {”value”: 0.7}
The detector starts the rst exposure after the trigger command has been received and processed
1
. All subse-
quent frames are triggered according to the conguration of the frame_time and count_time parameters. The
detector records nimages frames per trigger and stays armed until ntrigger are received. Figure 9.1 depicts an
internally triggered series dened by frame_time, count_time and nimages.
1
As the trigger command is sent over an TCP/IP connection the exact latency of the start of the exposure is hard to predict.
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