Richard, C.J. Aboulbanine, Z. Adhikari, G.D. Aftab, N. Boonpornprasert, P. Georgiev, G.Z. Groß, M. Hoffmann, A. Krasilnikov, M. Li, X.-K. Lueangaramwong, A. Niemczyk, R. Qian, H.J. Stephan, F. Vashchenko, G. Weilbach, T. JACoW Publishing Geneva, Switzerland 2673-5350 978-3-95450-241-7 10.18429/JACoW-IBIC2022-TUP20 English 273-276 emittance electron FEL solenoid gun Contribution to a conference proceedings 2022 2022-12 https://doi.org/10.18429/JACoW-IBIC2022-TUP20 https://jacow.org/ibic2022/papers/tup20.pdf The Photo Injector Test Facility at DESY in Zeuthen (PITZ) characterizes and optimizes electron sources for use at FLASH and European XFEL. AT PITZ, the transverse phase space is measured using a single slit scan and scintillator screen method. With the trend in photoinjectors towards lower current and emittance, these measurements become increasingly influenced by systematic errors including camera resolution and scintillator response due to smaller spot sizes. This study investigates the effects and corrections of the systematic errors for phase space measurements at PITZ.