This LCR meter was about 2 weeks old when it was killed by a charged capacitor. That was 15 years ago and in that state it was given to me.
MH8018 LCR meter
It is a plugin for the 8001 system. I have the first version of the 8001 and this LCR meter is made for the later model. To use it in my 8001 I disconnected the two soldered green wires you see on the picture below.
HM8018 inside
The meter has very good specs and measures the true reactance. By using G or Rs you can measure the real part of the impedance and calculate things like Q or D from that. A bit strange done. In the later model they do show things like D and Q on the display. It uses 160 Hz, 1600Hz and 16000Hz. A bit unusual too. The standard used frequencies since decades is 100/120Hz, 1kHz and 10kHz.
The repair was not hard to do. The transistorts of the input amp and output amp died. Replacement was more work. I had to match transistors because it had to much offset. A leaky capacitor hidden under the connector caused some strange behaviour. After replacing that the meter worked again and within the specs.
I scanned the schematics from the manual. There is no service information in the manual. So I had to alighn things from the schematic.
