100kV Probe
High Voltage part 4

Puplished 13th September 2019

A simple high voltage probe was built using a clear acrylic Perspex tube (with an external diameter of 10mm and an internal diameter of 3mm) and a 3D printed handle and tip (red plastic on picture above). The probe has a ratio of 1:100000 which means that for a 100kV input it provides a 1V output. The output can be easily connected to an Arduino nano with a 1.2V internal reference. The details of he electronic circuit are provided below. A high voltage can be dangerous or even fatal if mishandled. The construction of such a high voltage probe and all experiments relating to it must be supervised by a scientist and an engineer, who is/are experienced and skilled with respect to high voltage and the materials used, and who will assume full responsibility regarding the use of such systems. For educational reasons, this webpage presents a simple high voltage probe.

A high voltage input is connected to a 1:100000 voltage divider. The upper part's resistance is euqal to 1.410 GOhma and is rated 105kV. The lower part's resistance is equal to 1.410Kohma. The output is buffered using a voltage follower (TLC272). The upper part of the voltage follower (R1-R30) is built from 30 identical high voltage resistors (HHV-50JT-52-47M Manufactured by YAGEO (PHYCOMP), 47Mohm, 3.5kV, 0.5W, 5%) The lower part of the voltage divider (R31 - R34) is built fro them following resistors: 10KOhm, 2 x 2kOhm ond 100Ohm.

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