• In the course of [or During the process of ( or During )] the test the downstream pressure never reached 2.0 Torr.
• During the progress of the job ...
• In the course of [or During the process of ( or During )] the test the downstream pressure never reached 2.0 Torr.
• During the progress of the job ...
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012