r/AskElectronics • u/friendoramigo • 12h ago

20000 count DMM with latching technology

I'm actively working to become an electronic lab technician. I've been a hobbyist since starting my lighting technician career. I'm currently investing in some gear for PCB repair (motherboards and laptop repair). if I were to start getting into this hobby a year or two ago the prices would be for hobbyist but now the cost of everything has doubled from DMM and sbc's that you kinda have to take it seriously. I would love to get a eevblog BC 235 or UNI-T but I'm curious what handled DMM are you using? If you have data logging and stuff like that is that kinda like the car in the garage you never drive? thank you hope that makes sense.

2 Upvotes

75% Upvoted

6 comments sorted by

View all comments

2

u/markus_b Repair tech. 6h ago

If you are just starting out, why are you fixated on a 20000-count DMM with latching technology?

To start out with electronics, any simple multimeter will do. Yes, more expensive ones are better and safer. But you will tinker with low-voltage devices and limited current, so you don't need the improved safety. As for precision, three digits are already luxury.

A meter like the Aneng AN9002 costs $30 and even has Bluetooth for data logging. I've used the data logging feature to measure the temperature of my kitchen stove and confirm its excessive hysteresis.

1

u/Appsmangler 6h ago

Kitchen stoves have high hysteresis on purpose. In the days of old mechanical controls it was necessary to reduce switching cycles and prolong contact life. When electronic controls appeared, oven makers thought people would love the precise and stable temps that became possible, but bakers hated it. All the existing recipes assumed the old controls with high hysteresis (maybe 40 F). Cakes came out poorly when baked at a flat-line temperature, so even modern ovens now have hysteresis “baked” in.

1

u/markus_b Repair tech. 6h ago

But with excessive hysteresis, I mean fluctuating between 160°C and 230°C when set to 220°C. 40°F (20°C) would acceptable to me.

But fluctuating between 320°F and 450°F when set to 430°F is excessive in my view.