| ??? 08/01/07 15:19 Read: times |
#142589 - Gas igniters Responding to: ???'s previous message |
Russell said:
I use a gas igniter for my ESD tests. Not particularly scientific or traceable, but if my equipment survives this, there's a fair chance it will pass the real test. We analyzed these gas igniters and found out, that they produce a suffiently high voltage, but without any relevant energy. If you have a look at the human body model, you will find a "storage" capacitance of 100pF, which is charged up to the high voltage and which becomes discharged during the ESD hit. If you discharge the ESD into a 100nF capacitor, for instance, then you will find a voltage of about 15kV * 100pF / 100nF = 15V afterwards. But with the gas igniter you won't find any useful storage capacitance and as consequence there's no useful ESD energy. So, trying to "test" a product by the help of a gas igniter can hardly give you any useful information. If it succeeds this "testing", then you still don't know anything about the true CE compliance. Russell said:
Me, I pay someone to do it!!! I'm lucky that there is a local lab that has the right gear but isn't certified or traceable that charges me $200 for a pre-compliance for a handful of tests before i spend $8000+ for the *real* tests. The cheap guy turns out to be more knowlegable and helpful than the expensive lab that employs fresh graduate engineers that know very little. That's a good idea. We do the same! Kai |
| Topic | Author | Date |
| cheap EMC testing | 01/01/70 00:00 | |
| $5 | 01/01/70 00:00 | |
| not for emmiting, for immunity against ext.field | 01/01/70 00:00 | |
| old sparky | 01/01/70 00:00 | |
| Ever been in an EMC laboratory? | 01/01/70 00:00 | |
| not \\\"scientific\\\" maybe... | 01/01/70 00:00 | |
| Why? | 01/01/70 00:00 | |
| on the value of paper | 01/01/70 00:00 | |
| Backyard susceptance testing | 01/01/70 00:00 | |
| the \"cheap\" guy | 01/01/70 00:00 | |
| EMC guys | 01/01/70 00:00 | |
| Gas igniters | 01/01/70 00:00 | |
| let's estimate | 01/01/70 00:00 | |
Try to charge a 100nF cap with your igniter | 01/01/70 00:00 | |
| yes | 01/01/70 00:00 |