How to Test An ESD Mat for Periodic Verification - Video by American Hakko
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- Опубліковано 4 чер 2024
- This is the official video from American Hakko - In this video we test the resistance of an ESD mat per Standard ANSI/ESD S20.20 using a multimeter versus two, five lb. electrodes and a resistance meter.
If you do not have the proper equipment or you are unable to perform these tests, it is recommended that you obtain third party verification, or to purchase your ESD supplies from a reliable source.
American Hakko performs these test on their CHP brand ESD products. The CHP high-quality ESD products will help prevent and protect against electrostatic discharge (ESD) that can occur on the workbench. The CHP ESD supplies include, grounding kits, wrist and heel straps, gloves, finger cots, static shield bags, tapes, labels and floor and bench mats.
For a reliable source for your ESD supplies, visit us online at www.HakkoUSA.com
Thanks for watching! - Навчання та стиль
Great Video!
Hi. Do you know what ESD mat was used in this video demonstration? Was it a CHP or something from another vendor like sierra, acl staticide or 3m? Thanks.
Why use 5lb? Is it necessary to use 5 lb only ? Can you brief what is the effect of the pressure on resistivity?
Thank you very much for the information. Do we need to keep an insulated surface underneath the mat prior to testing
I don't think so, in fact it should be the other way around. As far as I can see, some mats have very conductive underlying surface, like hundreds of ohms, while other mats have just 10-20 times more conductive than front side (~20 nano siemens per 1 cm) which makes me think that they are designed to be laid on metallic bench, otherwise it's hard to guarantee dissipation on a huge working surface. That's why a good expensive mats have highly conductive back-surface.
Great demonstration.
I am not sure but normally in such a test, is it not advisable to test if the earth in the building are within specifications also?
Hi, thank you for your comment and question. Yes, Ii is definitely advisable to test if earth in the building is within specifications, and this is done by an impedance measurement on the electrical ground circuit.
Although this is advisable, it is not 100% necessary as an ESD safe workstation can also pass as long as it has an equipotential bonding point, meaning, if the entire workstation is bonded together and not necessarily bonded to earth ground, it can still be considered ESD safe. This is not always “advised” or best practice but it can still be ESD safe so I considered it as an extra test that is not always required when testing worksurface mat.
Hope this helps.
Thanks a lot for your great answer, it makes a lot of sense!
I understand that, to be ESD safe it does not matter if, lets say that you have 2000 volts of static electricity in your body, as log as all ESD safe areas have the exactly same voltage (not recommended)..
That it is the voltage difference, that are harmful? :-)
I want ESD Epoxy flooring installation method, 10,4ohms
Hello Sir,
I need to design a table with ESD compliance while also have high temperature resistant (below 260 C) and generally chemical resistant. Can you recommend what are the materials suitable for my application? Granite? Durostone? or anything that you have experience with?
Hi Aiman, for ESD compliance, the table needs to have an electrical resistance lower than 10^9 ohms. I don’t know the resistance of granite or durostone but generally speaking, ESD compliant table worksurfaces are either metal, rubber or vinyl. Metal and some rubber offer temperature and chemical resistance but I would not recommend vinyl. Our natural rubber mats SC-1001 through SC-1009 are all heat and chemical resistant
So it's cheaper to buy a new mat setup than acquire the equipment to properly test an existing mat.
Properly ground your mat and then in the winter when it is real dry in your house walk around with socks on on some carpet to build up some static and touch some metal to see if you get a shock. Then if you get a shock do the same thing again and touch your properly grounded mat and see if you get a shock. If you do not get a shock when you touch your mat, you will know that your mat is working properly. This is the cheap way to test your mat.
Unfortunately 99% of 'new' mats are not up to spec, I've thrown away two of them already. I think we should be able to check them cheaper with just a regular electrostatic duster or with a balloon. The idea is, if we charge a balloon against our hair, we should be able to feel (and see) the charge that attracts hairs, and then put it on the mat. If mat works, it should dissipate the charge very quickly, and we should be able to test against hairs that there is no charge anymore.
Are you saying do the testing at 12% RH and then again at 50% RH or it must be somewhere within that range?
Hi Josh, thanks for your question. If you are planning to test according to ANSI ESD standards for qualifying the product into your facility, then you must test at 12% RH and then again at 50% RH. If you are testing for periodic verification, it is recommended that you test at the lowest RH that your facility experiences. Hope this helps.
Can this be used for testing on antistatic epoxy coating
The mats that were being tested on was Antistatic, so if you want to see if it meets the required standard then I do not see why you couldn't.
*checks price of test equipment in video*
"welp looks like I'll just have to hope my aliexpress mat is up to spec"
Unfortunately 99% of aliexpress mats are not up to spec, I've thrown away two of them already. I think we should be able to check them cheaper with just a regular electrostatic duster or with a balloon. The idea is, if we charge a balloon against our hair, we should be able to feel (and see) the charge that attracts hairs, and then put it on the mat. If mat works, it should dissipate the charge very quickly, and we should be able to test against hairs that there is no charge anymore.
if you got a better multimeter with a higher resistance limit, using a meter COULD be valid. I would adjust to say mileage may vary depending on your meter's range
Why universal meter can't read resistance? Is it that because electrodes are to little? Specialist device is necessary to test?
Secondly How I can test wrist strap?
Hello 94PeterQ, thank you for your questions.
The biggest reason is that the surface resistance of an ESD safe mat is in the dissipative range (10^5 ohms/sq to 10^12 ohms/sq) which is too large for common multimeters, so you need a special device.
Wrist strap test: Wrist straps can be tested with the wrist strap tester (HAKKO FG-470), or you can use a multimeter to measure the resistance between the metal portion of your wrist strap and the grounding jack. Most wrist strap should give you close to 1 Megaohms reading, but there are also wrist straps for specific applications that have 0 ohms or 2 Megaohms.
@@HakkoUSA thank you for your answer. I have again one question to you. Why the special device for esd mat test have electrodes with dedicated weight and why the electrodes must be separated to dedicated lenght (I can see on this movie steel line with holders from two side)?
It’s because of the surface area, the probes are too small. If you try with a bigger electrode (such as a piece of aluminum foil) and press on it you’ll be able to measure the resistance with most multimeters (in the order of megohms). My guess is the weight is to ensure consistency, since pressing more leads to a lower resistance.
so basically a diy hobbyist cant really know or guarantee that his esd pad is truly safe.
@@sproket343 Yeah I got about halfway through the video and started to realize just how on a different level we are
You saying its not a good idea to put condoms in my fingers?
The funny part is "you can't measure high enough resistance with multimeter", and you are holding state of the art wallet-draining Fluke 87! 🤦♂Guys, hit "Range" button twice, you will switch to the conductance mode and will measure the nano-siemens instead, it is sensitive enough to see the difference even on a top side! The bottom should be a lot more sensitive, sometimes even for ohm-meter. If you need to convert 1 nano-siemens to ohm, it is 1/(nS * 10^9), so 1 nS is 1GOhm, 0.5 nS is 2GOhm etc
Checks price of testing equipment. Buys $ 2 rubber mat from hardware store and a $3 grounding strap for his wrist.
Why use 5lb? Is it necessary to use 5 lb only ? Can you brief what is the effect of the pressure on resistivity?
5 lbs is actually written into the standard. Pressure really doesn't effect anything electrically but what effects the electrical reading is surface area contact. So, what it can do is compress the material, possibly changing the material's electrical properties, and depending on the type of material, change the amount of surface area that is contacted.
Something soft like rubber can compress easily but something like epoxy or metal usually won’t be affected too much.
The idea is that weight/pressure could potentially change the reading, so 5 lbs was chosen as a standard so that the test can be repeatable in any environment. Hope that helps. Thanks for your question.
HakkoSoldering thank you so much for response. I have another question . Can i use multimeter with std probes to measure surface resistivity?
Can you tell me the exact difference between how to measure surface ans Volume resistivity?
Hi Dinanath,
The problem with a multimeter and standard probes is that most do not measure to a high enough resistance. With ESD materials, you need to be able to measure up to 10^12 ohms. The standard probes are also not recommended because of the shape, they will tend to “pierce” through the material rather than contact with the surface for an accurate measurement. It also is shaped in a way that will not provide consistent surface area contact when measuring multiple times over and over again.
Surface resistance will only measure from a point on the top surface to another point on the top surface. Volume resistance will measure through the material from the top surface to the bottom surface. Hope this helps.