- Usually the TR40-16bit 3U comes with two 1 kOhm terminated Camac front trigger inputs. There are two inputs for working with one detector and alternating signals (for example DIAL). The trigger inputs are electrically isolated from the transient recorder itself and transmit the pulse by inductive coupling.
- Optional two more trigger inputs can be specified at order time
- For each front trigger input exists also a global trigger input at the rack, which is then internally fed to all transient recorders. If required the global trigger signal can be blocked for each TR, to ensure that it reacts only on trigger signals that correspondto the signal input.
- There is also a Laser trigger (Trig-Las) option available, that includes a fast photodiode, that works in the UV (355) nm, we think that option is especially useful for passive Q-switched lasers. This option includes a potentiometer for adjusting the trigger threshold and one can monitor the signal behind the discriminator on the second BNC input. In this case the transient recorder has two BNC inputs as in the standard option and additional connector for the photodiode. (see the user manual) This option is orderable for the rack and can be fed into the global rack trigger.
- On the TR40-16bit-3U a pretrigger can be activated. The pretrigger mode the data from the ADC and the photon counts are buffered. The buffer is 1/16th of the trace length. If oversampling is activated it shortens the buffer by the oversampling factor. For a 16k trace this results in a 1k pretrigger. The buffered data covers then 25ns * 1024. If oversampling by factor of 4 ( 10MHz) is activated the pretrigger is 100ns * 256 with the identical time as before. For TR with 40MHz, the range bin 0 will then contain the data from 25ns * 1024 before the trigger and bin 1024 will correspond to the range bin 0 without pretrigger.
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