This function operates the MPA3 detector electronics:
time is specified in seconds.
file_name is given as a full path specification, e.g.: d:/data/probe_00012_00001.
Status returns 1 for 'on'.
The mpa3() function relies on the environment variable
HOST_MPA3, e.g.:
export HOST_MPA3=hasb1det.
Make sure that the applications Launch MPA3 and mpa3net.exe are active. They can be found on hasb1det under C:/MPA3.