electromechanic812291
calibrating speed
Timing the beam length measurement and tacho speed against the clock. Although the measuring roller circumference is known and has been programmed into the metres prescaler, it is always worth checking its accuracy in real time as a double-check against any maths mistake. The handle on the left is a quick-release lock for the beam (reel). I'm holding it shut as it's loose and was trying to unlock itself. The steel frame which I have my left arm through is a safety bar, which will quick-stop the motor if pushed down or up against a spring. You can tell the age of the photo by my old Nokia cellphone!
calibrating speed
Timing the beam length measurement and tacho speed against the clock. Although the measuring roller circumference is known and has been programmed into the metres prescaler, it is always worth checking its accuracy in real time as a double-check against any maths mistake. The handle on the left is a quick-release lock for the beam (reel). I'm holding it shut as it's loose and was trying to unlock itself. The steel frame which I have my left arm through is a safety bar, which will quick-stop the motor if pushed down or up against a spring. You can tell the age of the photo by my old Nokia cellphone!