OLP-5, OLP-6, OLP-8 5-15 Maintenance5.1 Cleaning the test portOver time, dust can gather on the photodiode,particularly if you leave the cover open for a whileor remove the adapter.To retain high measurement accuracy, werecommend that you clean the photodiode fromtime to time.Notice: Do not touch the photodiode in order toavoid soiling or scratching the glasscover.1. Pop open the cover on the front of the OLP.2. Unscrew the adapter by hand.You can now access the photodiode.3. Use a cotton swab dipped in isopropanol towipe off the photodiode. This is an effectivecleaning method that leaves no traces.4. Blow off the test adapter with pressurized air(e.g. anti-dust spray available in cans).5. Screw the adapter back on.6. Pop the cover back on.Tip: To avoid premature soiling of theassembly, keep the adapter in place andthe cover closed when you are not makingmeasurements.