EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: mendip_discovery on December 11, 2023, 07:48:04 pm
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I was at a customer's place today and I have failed a few Seward HAL104 Flash Testers as the Earth Bond has gone wrong.
The issue the customer has is when the earth bond part of the tester breaks it means that it could pass stuff that is actually a fail. Which isn't great.
What I am thinking is a Box with either the wires or a mains plug on the end, they make lighting so most of use a break out thing that accepts the wires. Then a Zero, 0.1 Ω, 0.5 Ω and 1 Ω resistor for checking Earth Bond.
I am guessing some nice chassis mount resistors are capable of putting up with 10A at 6V AC (Spec Sheet says 6V AC) so let us say 100W just to give some space for error. Now would it be best to connect 2 in a parallel configuration to help keep the heat down but also to help keep the ppm/C from impacting the readings?
Also, I wondered about adding a 200 kΩ resistor to the neutral > earth (with a jumper lead) so that they can check the leakage current at 1 kV which should be 5 mA. Swappable to a 10 MΩ and 100 MΩ for testing DC Insulation. But I am not sure what resistors to look for.
All this so they can do some sanity checks with the QC department from time to time. I was thinking of making one for myself as a backup for the bit of kit I already have. Seward does sell a Y160 Fault simulator with just a few fixed points at £130 last time I checked ( https://www.seaward.com/gb/products/manufacturing/accessories/fault-simulators/y160h-fault-simulator/ (https://www.seaward.com/gb/products/manufacturing/accessories/fault-simulators/y160h-fault-simulator/) )