So, the Calorimetric HP meter uses the same principle as my suggested measurement, with the only difference being that HP performs the reference measurement simultaneously with the target measurement rather than sequentially.
Erik K7TV >Hewlett Packard made the HP434A Calorimetric Power Meter, which could measure up to 10 watts by matching the temperature in a >load with that caused by DC power (which can be accurately measured). I often used one in the early 1960s (this was at work-->they were a bit pricey for ham use). > >Bob, N7XY ....... > The tuner > will of course be a mix of materials, so one would have to measure the > rate at which the tuner heats up when heat is applied through a know > heating source rather than TX power. If it is done that way, one needs > to know neither the mass nor the specific heat capacity, since what > one is measuring is essentially the mass times the specific heat capacity. > > 73, Erik K7TV > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
