Surface Insulation Resistance Tester

Surface insulation resistance (referred to as SIR) is widely used to assess pollutant effects on the assembly reliability.
Compared with other methods, SIR has the advantage in addition to detection of local pollution, can also be measured ions and non-ionic pollutants on the printed circuit board (PCB) Reliability.
In the PCB assembly process, the current use of several different flux. But also in the hot air solder levelling (HASL) process is also used when the spray tin flux, most of these flux containing PEG (polyethylene) or PPG (polypropylene glycol), glycol when these substances are adsorbed on the PCB substrate, that is not easily removed. So if a small amount of flux residue on the PCB, it will be significantly decreased SIR value, leading to poor insulation, electrical easy to failure.
The new patent SIR / MIR electrochemical migration testing equipment. Test system uses advanced design, the circuit board can be up to 256 nodes of the test, while maintaining high accuracy, high reliability, and repeatability. System uses solid state switches, instead of relays, thereby reducing the current leakage and enhanced reliability. The range can range from 1 MΩ to 100 Gigabit Europe, while its accuracy can be guaranteed less than 3%.