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Fashionable take a look at gear is nice, however there’s one thing a couple of large meter with a swinging needle and a mirror for parallax correction that makes a tool seem like actual gear. [Thomas] reveals us a Danish LCR meter (or, because it says on the entrance, an RLC meter). The gadget passes AC via the part and makes use of that to find out the worth based mostly on the setting of a variety swap. It seems to be to be in nice form and handed some fast checks. Take a look at it within the video under.
An outward inspection reveals few surprises, though there’s an odd set of terminals on the again labeled DC bias. This lets you present a DC voltage in case you’ve gotten a capacitor that behaves in a different way when the capacitor has a DC voltage throughout it.
Block diagram for the MM2
The circuit can measure — because the title implies — resistance, inductance, and capacitance. The handbook reveals a pleasant block diagram if you wish to perceive what’s occurring.
Bodily opening it up was a little bit of a puzzle. That older gear was typically well-constructed. Inside are some good PCBs, quite a lot of transistors, and delightful wiring harnesses. Somebody took their time constructing this unit, and it reveals.
Often, while you see gear like this, it’s a bridge, and you need to zero the meter, however not so with the MM2. As of late, you might be seemingly to make use of a microcontroller to measure the cost and discharge price.
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