It has a strain gauge on the rotor and the distortion of the rotor under load is transmitted via an ingenious system of digitizers and transformers. This is translated into a 5 VDC (max) signal proportional to the torque. You can feed it into one of the digital scope channels and display the dynamic torque in addition to the V & I input pulse information.
Damned thing has a microprocessor inside. Not cheap, tho. Terry On Fri, Jun 26, 2009 at 2:32 PM, Jed Rothwell<jedrothw...@gmail.com> wrote: > Terry Blanton wrote: > >> Using the DR-2112: >> >> >> http://www.lorenz-messtechnik.de/english/products/torque_rotating_contactless.php >> >> we measure it directly. > > Ah. So this is a miniature dynamometer. I guess it acts as a brake slowing > the thing down to some extent while measuring RPMs. The big dynamometers I > have seen work that way. > > I have an indoor bicycle trainer which is supposedly very stable and > accurate, calibrated by the factory. It has fluid that produces variable > resistance increasing with speed, mimicking the effect of a headwind. A > speedometer on the bicycle monitors RPMs and displays speed, distance and > watts. I guess that would be a dynamometer of sorts. > > - Jed > >
