How to make GLK12232-25 display less susceptible to ESD contact and air discharges. Should the corner mounting hols (pads) be grounded or floating.
Tx,
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<font size=-1>[ This Message was edited by: 4PI on 2002-02-26 12:39 ]</font>
<font size=-1>[ This Message was edited by: 4PI on 2002-02-26 12:42 ]</font>
GLK12232-25 & ESD
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They should be grounded, but - THIS IS IMPORTANT - doing so is not automatically the "right thing".
The mounting holes (or most of them, anyway), are connected to the ground plane and the ground plane is connected to the metal bezel and also connected to the electrical ground. If you are experiencing ESD, you want all of that and the case too to be at THE SAME GROUND. The best thing would be if the case is the ground (like an automobile). Use no ground connections but the case. Failing that, USE THICK WIRE. By thick, I mean, as thick as you can stand! ESD is not about a wire's current carrying capacity, it is about a wire's surface area. ESD does not travel *through* wire, it travels *on* wire. To make sure that you do not allow to be created, a voltage differential, you want the ESD to exist equally on all points of your ground. This is what you are trying to accomplish in most instances, to minimize the ground impedance at all points on the ground.
Does that help?
<font size=-1>[ This Message was edited by: Aniso on 2002-02-25 15:46 ]</font>
The mounting holes (or most of them, anyway), are connected to the ground plane and the ground plane is connected to the metal bezel and also connected to the electrical ground. If you are experiencing ESD, you want all of that and the case too to be at THE SAME GROUND. The best thing would be if the case is the ground (like an automobile). Use no ground connections but the case. Failing that, USE THICK WIRE. By thick, I mean, as thick as you can stand! ESD is not about a wire's current carrying capacity, it is about a wire's surface area. ESD does not travel *through* wire, it travels *on* wire. To make sure that you do not allow to be created, a voltage differential, you want the ESD to exist equally on all points of your ground. This is what you are trying to accomplish in most instances, to minimize the ground impedance at all points on the ground.
Does that help?
<font size=-1>[ This Message was edited by: Aniso on 2002-02-25 15:46 ]</font>
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Henry,
Do you have a meter? Can you measure two points for continuity? The bezel certainly has the potential to be connected, given that it is in contact with 6 bare gold plated areas, but probably not all are due to paint or oxide on the bexel.
4PI,
you have not told me that you have tried my first and best suggestions or even that you understand why I suggested those things. In fact, you have not even told me if your case is metal. Let's start with that.
Do you have a meter? Can you measure two points for continuity? The bezel certainly has the potential to be connected, given that it is in contact with 6 bare gold plated areas, but probably not all are due to paint or oxide on the bexel.
4PI,
you have not told me that you have tried my first and best suggestions or even that you understand why I suggested those things. In fact, you have not even told me if your case is metal. Let's start with that.