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Time Tagger Series
I want to use falling edges in my experiment. How do I do that?
On the software level, the falling edges are independent channels. In the web application, these are marked explicitly. In the software libraries, the number of a falling edge channel is a negative number of the physical channel, e.g., the falling edges of the physical channel 2 correspond to the software channel -2. Time Taggers delivered before mid 2018 had different channel labeling scheme. See the Time Tagger user manual for more details.
In some measurements I can specify optional channels. What value should I pass when I don't want to specify an optional channel?
You can specify a special integer value explicitly, but this is not recommended. Use the predefined constant
CHANNEL_INVALIDinstead. For C++, the constant is defined in
TimeTagger.hand is called
CHANNEL_INVALID. In python, it is
Pulse Streamer 8/2
With an oscilloscope I observe significant ringing in the generated pulses. How do I reduce them?
The output stages of the Pulse Streamer are optimized to work with 50 Ohm load. When the outputs are connected to a load with higher impedance, the ringing will occur at the pulse edges. Such ringing originates from signal reflections caused by impedance mismatch. Many oscilloscopes allow you to enable internal 50 Ohm load. If your scope does not have internal load, please use an external 50 Ohm impedance adapter and connect it between the cable end and the oscilloscope input.