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Monthly Archives: September 2016
CM600DU-24FA IGBT – Removal of RTC over-current protection
The real-time current control (RTC) that can found in some IGBT modules is a protection against short circuits in f.ex. motor drives where they could have been used. The conditions on which the RTC acts is however sharing area with … Continue reading
Kaizer DRSSTC III update #6 – First full power test after removing RTC
After cutting out the bonding wires to the RTC circuit of the CM600DU-24FA IGBT bricks, which we thought could be one of the reasons that we were not able to trip the 1500 A OCD setting, we had a short test … Continue reading
Astro HVO-Vario G 38, teardown of a 862 MHz cable TV amplifier
These are highly modular cable TV amplifiers, they are set up by using a wide range of different insert cards with different frequency ranges or options. These are 38 dB amplifiers in the range from 47 to 862 MHz. This … Continue reading
Finished project: Merlin Gerin PM700 power meter
Two days ago I conducted the first successful resistive load test of a 3 phase power meter that can measure voltage, current, power consumption, harmonic distortion and power factor. Read all about the construction and see all the pictures and video … Continue reading
Finished project: 3 phase 13A Lübcke variac
Yesterday I conducted the first successful resistive load test of a 3 phase 13 A variac stack that has been enhanced with safety and monitoring options. Read all about the construction and see all the pictures and video demonstration here.