IMO most components die suddenly not gradually. If a diode passes the functional test it is most likely fine. They all look good to me.
Sent from my iPhone > On Jan 20, 2017, at 6:09 AM, Jay Summet via EV <[email protected]> wrote: > > I tested one of my original Curtis 1231C didoes, as well as one of the > replacement diodes I bought to replace them (see summary results below). > > Questions for people with more experience: > > 1. The maximum amperage I could generate on my bench power supply is 3.2 > amps. Is that enough amperage to compare the two diodes? The forward voltage > drop on both diodes appears to rise as the amperage rises, and I don't know > if the lines will cross as the amperage goes up. > > 2. Any pointers for measuring junction temperature and temperature rise? > Waving a non-contact thermometer around didn't give me super consistent > results. > > Jay > > > Blog post link with photos: > > https://www.summet.com/blog/2017/01/20/curtis-1231c-diodes-diotec-dr7506fr-vs-tsr2402r/ > > Summary of results: > Here are my results for the original TSR2402R that I unsoldered from my > broken controller: > > Power Supply providing 3.2A, forward voltage drop: 0.776 volts > Power Supply providing 2.0A, forward voltage drop: 0.737 volts > Power Supply providing 1.0A, forward voltage drop: 0.697 volts > Fluke Diode Setting: 0.351 vdc > > Average time for the button temperature to raise from 25 °C to 50 °C with a > 3.2A current: 45 seconds > > > The replacement parts I purchased were from DIOTEC, specifically their > DR7506FR model (the R at the end means “Reverse Polarity”, making them an > exact drop in replacement in form factor and polarity). They were marked: > “DT110 DR7506FR” plus a diode schematic. Here are my results for the > upgraded component: > > Power Supply providing 3.2A, forward voltage drop: 0.754 volts > Power Supply providing 2.0A, forward voltage drop: 0.700 volts > Power Supply providing 1.0A, forward voltage drop: 0.646 volts > Fluke Diode Setting: 0.399 vdc > > Average time for the button temperature to raise from 25 °C to 50°C with a > 3.2A current: 47.5 seconds > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
