Surface Resistance
Electrical FOR: Insulation $1,430The purpose of this test is to measure the resistance of the outer surface of the insulation in a high humidity environment. This is to ensure that the resistance along the outer surface is large enough to prevent leakage current between connections.
The following parameters can be adjusted for the test:
- Conditioning duration
- Applied voltage
- Electrode separation
Procedure
- Perform visual examination of the specimen. Record any observed defects.
- Wrap two conductive electrodes around the specimen spaced 1 inch ± .005 inch apart between the electrode's nearest edges.
- Connect the electrodes to the test circuit and place the specimen into a sealed chamber at room temperature with relative humidity between 90 – 96%.
- After a specified conditioning duration, a voltage is applied across the electrodes and the leakage current is measured.
- Report the specimen separation distance, measured leakage current, and humidity.
Covered specifications
- AS22759 Section 5.4.3
- AS4373 Method 506
- AS81044 Method 4.7.5.23
- AS85485 Method 4.7.23
- ASTM D3032 Section 7
- EN3475 Method 304
- FED-STD-228 Method 6041
- JES292 Method 52
- MIL-C-85485 Method 4.7.23
- MIL-M-24041 Method 4.7.4.4
- MIL-W-81822 Method 4.6.27
- BSS7324 Method 7.50
- EN50305 Method 6.6