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2 hits in 156 ns n NOISE ~ 75 Hz

MDT tubes time spectra. 1 tdc count = 0.78 ns Trigger window = 1.6 m s 168000 triggers collected. 2 hits in 156 ns n NOISE ~ 75 Hz. ( tdc counts ). 12 hits in 156 ns n NOISE ~ 460 Hz. ( tdc counts ). trigger-related noise. 98 hits in 156 ns n NOISE ~ 3.7 kHz.

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2 hits in 156 ns n NOISE ~ 75 Hz

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  1. MDT tubes time spectra 1 tdc count = 0.78 ns Trigger window = 1.6 ms 168000 triggers collected 2 hits in 156 ns nNOISE~ 75 Hz ( tdc counts ) 12 hits in 156 ns nNOISE~ 460 Hz ( tdc counts ) trigger-related noise 98 hits in 156 ns nNOISE~ 3.7 kHz The high noise level is caused by non proper grounding connections ( tdc counts )

  2. With a more accurate grounding connections (ground pins and screws on the ground plates) the situation has improved 1 tdc count = 0.78 ns Trigger window = 1.6 ms 63000 triggers collected 0 hits in 156 ns nNOISE~ 0 Hz ( tdc counts ) 2 hits in 156 ns nNOISE~ 200 Hz ( tdc counts ) 1 hit in 156 ns nNOISE~ 100 Hz The different lenght in the time spactra is dued to the gas flow-meter miscalibration ( tdc counts )

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