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Entry  Tue Mar 1 19:03:37 2022, Keita Mizukoshi, Scaler issue to evaluate live time  
    Reply  Thu Mar 3 16:14:16 2022, Stefan Ritt, Scaler issue to evaluate live time  
       Reply  Fri Mar 4 03:55:33 2022, Keita Mizukoshi, Scaler issue to evaluate live time  pulse_example.pngrate.png
          Reply  Mon Mar 7 16:37:54 2022, Stefan Ritt, Scaler issue to evaluate live time  Screenshot_2022-03-07_at_16.37.32_.pngScreenshot_2022-03-07_at_16.35.44_.png
Message ID: 866     Entry time: Tue Mar 1 19:03:37 2022     Reply to this: 869
Author: Keita Mizukoshi 
Subject: Scaler issue to evaluate live time  

Hi. I'm trying to evaluate livetime of the evaluation board with the hardware scaler. I'm facing a strange issue.

I took the rate with the function, DRS->GetScaler(int channel).
I guess that channels 0--3 mean the rate for the channel, and channel 4 means the counter of the trigger.
I took the 1,000 pulses generated by a pulse generator with 50 Hz.
The scaler values are ~ 39.83, not 50.
The timestamp difference between the initial event and the final event is 19.98 seconds.
1000/19.98 ~ 50, thus, the evaluation board took the pulses with enough livetime.

Can we believe the scaler value for the livetime evaluation?

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