Projects › Digital EHT Probe, 0–20 kV
Digital EHT Probe, 0–20 kV
In designTest gearTelevisionSafety
Last updated 30 September 2026
Checking the EHT on an early television normally means a meter and a separate high-voltage probe. This one is self-contained: a 2 GΩ divider in a long insulated body, and a 3½-digit LCD panel meter in the handle reading directly in kilovolts.
Two 1 GΩ, 20 kV high-voltage resistors share the voltage along the probe, a gas-discharge tube protects the handle end if they ever fail, and the floating battery supply means the earth clip is the only connection to the set.
At a glance
| Range | 0 – 20 kV DC, 0.01 kV resolution |
|---|---|
| Divider | 2 GΩ : 20 kΩ (100 000 : 1) |
| Display | 3½-digit LCD panel meter, reads in kV |
| Power | 9 V battery, push to read |
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.