Category Archives: Electronics

ANENG AN-999S Desktop Multimeter

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So I got myself a new toy from AliExpress: ANENG AN-999S Desktop Voice Multimeter Professional Digital Bluetooth 19999 Counts True RMS Auto Range DC/AC Meter (I got the ‘AN999S 4’ option with batteries and extras). It’s just a bench multimeter, but it has some cool features which make it a welcome addition to my workstation, which is that it has a built-in clock and thermomiter, and if you press the button on the COM lead it will speak the reading for you, which is pretty cool, and I guess means you don’t have to look away from the circuit to get your reading. Look forward to playing with this one, definitely a happy customer so far.

New toys

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Got myself some new toys! On the left is an OWON XDM1041 Digital Multimeter (for AUD$169.49 from AliExpress) and on the right is an UNI-T UTG962E Function Waveform Generator (for AUD$202.35 from AliExpress).

On the black table in the left is my Digitech QM1323 Digital Multimeter. You can see I’ve been hanging my probes from my lamp, which seems to work:

@epilys on #lobsters asked about my LED Lamp, which is an 5 Diopter LED Illuminated Magnifying Lamp.

Continuity tester

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I had a suspected short circuit in a cable I made (I think I used too much heat on the heat shrink and caused insulation to melt) and what I needed was a continuity tester. My multimeter is bollocks for continuity so I knocked together my own:


I used a green 5mm LED, a 68 ohm resistor, two AA batteries, some banana sockets, and a bit of wire. I used my rotary tool with drill bit, burr, and countersink to score the holes in the case.

I used this LED Resistor Calculator to figure out the resistor rating (~50 ohms). I used my M328 Multi-Function Tester to figure out the forward voltage across my LED (it was 2.1 V, the default).

p.s. the cable under test was shorted! Turns out its a bad idea to put heat shrink tubing over electrical tape! And now we know.