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The commissioning work of a Cosmic Muon Veto detector (CMVD)
on top of the mini-ICAL detector at Madurai, India is continued using extruded plastic scintillators, embedded
WLS fibers and the SiPM as a photo-transducer. The CMVD is being built to study the
feasibility of a cosmic muon veto for a shallow-depth neutrino experiment. An experimental setup was
designed to characterise all those SiPMs in a temperature and humidity controlled environment. The readout electronics
involves trans-impedance amplifiers followed by an opamp buffer stage of combined gain 1.245 mV/$\mu$A and a
digital storage oscilloscope for storing the data with a minimal distortion of SiPM signal.
Various characteristics of the Hamamatsu SiPM (S13360-2050VE), e.g. signal shape, optically correlated
and uncorrelated noise, recovery time etc were studied as a function of $V_{ov}$, number of photoelectrons,
the ambient temperature and the humidity. This paper will cover the details of those results.
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