Using high value, precision thick film resistance elements, I have succeeded to make a calibration standard level verification box for evaluation of latest produced insulation testers.
Author: Mr. Kiriakos Triantafillou, Industrial Maintenance Electrician
Company/Institute: ITTSB Blog www.ittsb.eu
Industry/Application Area: Electrical test and measurement equipment
Product used: Powertron GST 4020
The Challenge
Handheld insulation test equipment currently on the market produce an output of several test voltages and several measuring ranges. Below are common examples:
- 50V: 3M to 55M
- 100V: 3M to 110M
- 250V: 3M to 275M
- 500V: 3M to 550M
- 1000V: 3M to 25.0 G Ohm
Verification of the insulation test equipment requires a specialized and complex high-resistance system that includes several resistance values. At a minimum one resistor only is to act as representative example for its measuring range. Additional requirement for such special high-resistance system this is max working voltage that must be able to cover 1000V nominal, up to a maximum of 4000V.
The Solution
The product specifications of the Powertron Thick Film GST 4020 Series resistors meet the application requirements of resistance value and working voltage. This outstanding product has even more to give: Precision level of 0.25% up to 2.6 G Ω and a remarkable TCR specification.
http://www.vishaypg.com/doc?63630
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