Apparently, they realize that a good working apparatus will lower property damage. Then it is probable that your results may not be as accurate as they should be. Somewhere on your pump panel there should be a metal stamped tag. This tag reveals the results that your apparatus achieved when it was new. It states the pressure at which the tests were conducted and the engine speed in RPMs.
All manufacturers use the same system.
If your department does not own this book, it would ba a good one to have at the station. You may need to buy or borrow equipment to do the test. Here is a list of items your department will need to get started. Two 10 ft. A deluge gun with three inlets, and a set of smooth bore tips.