  The Proton Improvement Plan, Stage Two (PIP-II) is a program of upgrades
proposed for the Fermilab injection complex, which central part is an 800 MeV,
2 mA CW SRF linac. A prototype of the PIP-II linac front end called PIP-II
Injector Test (PIP2IT) is being built at Fermilab. As of now, a 15 mA DC,
30-keV H- ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1 MeV CW
RFQ, followed by a 10 m Medium Energy Beam Transport (MEBT) have been assembled
and commissioned. The MEBT bunch-by-bunch chopping system and the requirement
of a low uncontrolled beam loss put stringent limitations on the beam envelope
and its variation. Measurements of transverse and longitudinal beam dynamics in
the MEBT were performed in the range of 1-10 mA of the RFQ beam current. Almost
all measurements are made with 10 {\mu}s beam pulses in order to avoid damage
to the beam line. This report presents measurements of the transverse optics
with differential trajectories, reconstruction of the beam envelope with
scrapers and an Allison emittance scanner, as well as bunch length measurements
with a Fast Faraday Cup.
