TECHNICAL NOTE - Digi-Key
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1. Visit digikey com oKintern ational TECHNICAL NOTE OK INTERNATIONAL amp METCAL SOLDERING SYSTEMS ELECTRICAL OVERSTRESS ELECTROSTATIC DISCHARGE STATEMENT OF COMPLIANCE All OK International Oki and Metcal soldering desoldering and rework systems are designed and tested to meet or exceed all applicable ESD and EOS Standards listed below as they apply to soldering products OK International Oki amp Metcal branded soldering systems offer superior EOS ESD protection Because our soldering systems deliver continuous current they cannot generate switching transients Typical values for tip to ground resistance and tip potential are 0 8 ohms and 1 0mV RMS well within the MIL STD and Commercial International specifications OK International also offers extra protection against potential ground faults in its MX and MFR Series Soldering Systems with an Auto Off feature This feature senses the DC continuity resistance of the output cable and handle assembly through the cartridge If the resistance of the output circuit exceeds a preset reference level the system is turned off This is fail safe protection against any ground loss On the OK International MFR Series and the Metcal MX 5000 Series soldering systems a ground fault monitor is built into the power supply to continuously monitor the AC supply mains ground circuit In the event of a mains ground failure or if the mains ground should go out of specification the system is2. immediately switched off and the system cannot be re powered until the mains ground is restored OK International also protects against ESD by using static dissipative materials 10 10 ohms sq surface resistivity for all surfaces that are in direct contact with soldered components And where possible Metcal uses static dissipative materials with the stricter surface resistivity of 10 19 ohms sq This limits the opportunity for any substantial static charge build up However the user concerned with ESD protection must still insure that the work surface is made of static dissipative material and is properly grounded A static dissipative surface insures efficient but controlled dissipation of static charges Dissipative surfaces will also distribute the charge over the entire surface area limiting the possibility of point charge buildup For information on how to check static dissipative material for surface resistivity see Testing Methods APPLICABLE STANDARDS a STM13 1 2000 J STD 001D MIL STD Tip to ground resistance Ac Tip Voltage lt 20mV RMS N A lt 2mV RMS Tip leakage current lt 10 mA AC N A N A no reference made in no reference made Tip Transient voltage document lt 2V peak in document J STD 001D only mentions that the AC and DC leakage currents from tip to ground should not create deleterious effects on the equipment components but does not explicitly state limits 12151 Monarch Street Garden Grove CA
3. 92841 1 714 799 9910 1 714 799 9533 fax www okinternational com Visit digikey com oKintern ational TEST DATA AND RESULTS The following test results were independently conducted amp verified by the ESDA in accordance with the procedures outlined in the STM13 1 2000 document OK International PS900 PS800 RF Resistance lt 2ohm AC Tip Voltage AC Tip Current Data Point Hot Cod lt 20mV lt 10mA 0 41 OK International MFR PS1K PS2K 1100 2200 RF Tip to Ground Resistance lt 2ohm AC Tip Voltage AC Tip Current DataPoint _Hot_ Cold lt 20mV lt 10mA 0 39 OK International MX 500 5000 RF Resistance lt 2 ohm AC Tip Voltage lt AC Tip Current Data Point Hot Cold 20mV lt 10mA 1 0 50 0 49 12151 Monarch Street Garden Grove CA 92841 1 714 799 9910 1 714 799 9533 fax www okinternational com Visit digikey com oKinternational TIP TO GROUND POTENTIAL TEST USING WAHL T2200 METER References Wahl ST2200 user manual Purpose of test Measuring potential of solder tip to AC ground Equipment Wahl ST2200 soldering iron tester Threshold pre set at lt 2mV RMS AC ONLY test Specification tip to ground potential lt 2mV RMS AC ONLY test 1 2 3 4 5 6 7 8 Plug the Wahl ST2200 meter into a properly grounded wall outlet Plug the solder system e g MX 500 directly into the outlet on the right side of the Wahl meter T
4. ED and the digital readout will be higher than 5 ohms for resistance Appendix A Wahl Tester Sensor Care The sensor of the Wahl meter should be cleaned periodically The sensor can get built up with blackened residue from the solder flux A medium stiffness brush and warm water can be used to clean the sensor Isopropyl alcohol can also be used if allowed to dry completely before using the unit and proper caution observed Re tin the sensor if necessary Use solder wick to clean then re tin with a small bead of fresh solder 12151 Monarch Street Garden Grove CA 92841 1 714 799 9910 1 714 799 9533 fax e www okinternational com
5. m oKinternational TIP TO GROUND RESISTANCE TEST USING WAHL T2200 METER References Wahl ST2200 user manual Purpose of test Measuring resistance of solder tip to AC ground Equipment Wahl ST2200 soldering iron tester Threshold set at 5 ohms Specification tip to ground resistance lt 5 ohms Specification tip to ground resistance lt 5 ohm 1 Plug the Wahl ST2200 meter into a properly grounded wall outlet 2 Plug the solder system e g MX 500 directly into the outlet on the right side of the Wahl meter 2 Turn the select rotary switch on the Wahl meter to RESISTANCE Make sure the select flip switch is on TIP TEST 3 Insert the solder tip cartridge to be tested and turn on the solder system 4 The tip to be tested should be cleaned before conducting test ref OKI Tip Care guide The sensor of the solder iron tester should also be fairly clean and not blackened with burned solder flux etc See appendix A 5 Apply a small amount of solder on the tip can be any typical solder type preferably low activity flux medium gage wire example Kester Sn96 5 Ag3 0 Cu0 5 flux 275 0 031diam lead free 6 Firmly touch the solder tip to the Wahl meter sensor Ensure there is good contact Wait a few seconds for the reading to stabilize 7 For a test result of PASS the FAIL MV OHM LED light should be GREEN The digital readout will be 5 ohms or below for resistance 8 For a test result of FAIL the FAIL MV OHM LED light will be R
6. urn the select rotary switch on the Wahl meter to MILLIVOLTS AC ONLY Make sure the flip switch selector is on TIP TEST Insert the solder tip cartridge to be tested and turn on the solder system The tip to be tested should be cleaned before conducting test ref OKI Tip Care guide The sensor of the solder iron tester should also be fairly clean and not blackened with burned solder flux etc See appendix A Firmly touch the solder tip to the Wahl meter sensor Ensure there is good contact Wait a few seconds for the reading to stabilize For a test result of PASS the FAIL MV OHM LED light should be GREEN The digital readout will be lt 2mV for tip to ground potential For a test result of FAIL the FAIL MV OHM LED light will be RED The digital readout will be gt 2mvV for tip to ground potential Appendix A Wahl Tester Sensor Care The sensor of the Wahl meter should be cleaned periodically The sensor can get built up with blackened residue from the solder flux from taking other measurements like tip temperature A medium stiffness brush and warm water can be used to clean the sensor Isopropyl alcohol can also be used if allowed to dry completely before using the unit and proper caution observed Re tin the sensor if necessary Use solder wick to clean then re tin with a small bead of fresh solder 12151 Monarch Street Garden Grove CA 92841 1 714 799 9910 1 714 799 9533 fax www okinternational com Visit digikey co
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