[en] This thesis presents a measurement of Υ meson production in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 468 pb^-1. The Υ mesons were identified using the decay channel Υ→μ⁺μ^-. The measurements were performed for exclusive diffractive production in the kinematic range Q²<1 GeV², 60< W<220 GeV, and 15< Q²<100 GeV², 60< W<220 GeV, where Q² is virtuality of the exchanged photon and W is the photon-proton centre-of-mass energy. A feasibility study for the Υ meson inelastic production has also been performed. The measured cross sections are compared to and agree well with theoretical predictions within the perturbative QCD framework such as Martin-Ryskin-Teubner two gluon exchange and NRQCD. As the technical part of this thesis, work related to the commissioning of the Straw Tube Tracker (STT) and to the Zeus Event Visualisation (ZEVIS) software package are presented. STT developments include: the STT DSP (Digital Signal Processor) quality monitor was developed, the pattern recognition algorithm was optimised for speed, and used in the Third Level Trigger (TLT) in order to reduce the accepted event rate by rejecting non-physics background. The TLT Charge Current(CC) slot rate was reduced by an order of magnitude, offering a rate reduction for the total accepted TLT rate by ∼2%. ZEVIS developments include: the STT hit visualisation scheme in 2D, 3D and tan(θ)-φ view, and a user-friendly interface called ''EasyTool'' for global ZEUS track and hit visualisation for all ZEUS components. (orig.)