This sounds like the BBC show Crime Traveller (1997), which had a detective use a colleague's time machine to solve crimes. (Which means that both the starting point and the time-travel occurred in contemporary settings.)
Plot summary from Wikipedia:
Jeff Slade is a detective with the CID department of the local police force led by Kate Grisham; although unusually for such a position he is an armed officer, carrying a handgun as routine. Slade is a good detective who gets results although his approach is somewhat maverick and his methods do leave a lot to be desired and have more than once landed him in trouble. Amongst Slade's colleagues at the department is science officer Holly Turner who has a secret that Slade manages to uncover. Holly owns a working time machine that was built by her late father. The machine is able to take Slade and Holly back far enough in time to witness a crime as it happens and discover who committed it. As a result, Slade's track record with crime solving goes through the roof with case after case being solved in record time.
You can see the wired shutters being closed and the circuit engaging here: (Click images for larger versions)
The time machine is a bit of a mess:
The first 2 episodes are currently available on YouTube (at least for me):