All Questions
30
questions
2
votes
0
answers
214
views
Suggestion for ESD Chassis Ground for Battery-Operated Device with Plastic Enclosure
We are developing a wearable device that is battery powered which is enclosed with a plastic enclosure. As a requirement for safety, we submitted the device for EMC testing, which includes Indirect ...
2
votes
3
answers
178
views
ESD Current path flow on this Diagram
I was reading about ESD diode arrays and protection devices and saw this question over here.
My question is:
In this diagram below, can someone help me to draw/identify the path of current flow ...
- 1
1
vote
1
answer
1k
views
Parallel RC circuit for chassis GND and digital GND isolation
In our design we've used a parallel RC circuit for chassis ground and digital ground isolation
The resistor value is 100 Ω. The capacitor is 1000 pF 4 kV.
I was told that it's basically for "EMI,...
- 2,593
2
votes
2
answers
301
views
ESD damage without earth ground
Can you explain how a totally floating PCBA (with semiconductor chips/ components stuffed, but no any connection to earth GND) is damaged by an ESD event from human touch?
If human body is charged to ...
- 21
8
votes
1
answer
2k
views
What are the drawbacks of connecting circuit GND and Chassis via multiple mounting screws (for EMC and Safety)?
Although there are various suggestions around for how to connect circuit GND to the earthed chassis (say, the chassis has a point-to-point resistance of around 1 mΩ) in devices, there seem to be two ...
- 22.5k
0
votes
1
answer
99
views
Electricity to ground
I was working on a games console and accidently got shocked by a capacitor.
I was wearing a ESD strap that was connected to the back of my pc which is connected to a powerboard and to a grounded power ...
- 25
1
vote
3
answers
1k
views
When handling a PCB, should I ground myself to earth or something else?
I have been researching electrostatic discharge when it comes to safely handling PCBs, and I'm having trouble understanding how I should ground myself. Many people say to just touch any conductive ...
- 11
0
votes
1
answer
473
views
Solder station grounding setup
I have a Sugon T26 soldering station.
It has an European 2 pin plug, I have a 3 pin adapter for it.
As far as I am aware there will be no ground connection using this method.
It comes with a ground ...
2
votes
1
answer
201
views
What happens if the ground of a PCB touches the earth?
I know that if an object is significantly more/less charged than another object and goes near it, an ESD can appear and then both objects would become balanced. This can happen when a human touches ...
- 131
9
votes
1
answer
4k
views
Is it better to connect ESD (TVS) Diodes to chassis ground or signal ground?
Application: We have a PCBA inside a vehicle's embedded system. The PCBA receives DC voltages from a power input connector. We do have access to signal ground aka 5V_return at the power connector and ...
- 133
0
votes
1
answer
102
views
Is a loose psu plugged into a three prong outlet but off a good thing to clip to an esd mat aligator clip?
I bought an anti static mat, ifixit portable, so I wear the wrist strap, clip it to the mat, the ground wire that came with the mat clips the the mat the other aligator clip clips to the grill of a ...
- 79
2
votes
2
answers
616
views
Grounding and ESD questions
I have a series of questions in regards to grounding and ESD, posting those in one topic as they're all related. This is located in Poland. I'm not too concerned about legality of grounding to neutral,...
- 21
7
votes
2
answers
4k
views
Can I clip an antistatic wrist band to an extension cord ground pin plugged into my wall outlet for laptop work? [duplicate]
I've done some small laptop stuff without the wrist strap, but I might replace a logic board of a MacBook and will be working on it for a long time. I have wrist straps and might as well use one.
I'm ...
- 79
2
votes
3
answers
2k
views
Install grounding cable with eyelet to outlet, no center screw
I've found an ESD mat that comes with a grounding cable with an eyelet that's supposed to be screwed into the center (grounded) screw of an electrical outlet. But in my home, the outlets do not have ...
- 183
3
votes
1
answer
647
views
ESD Mats failing with constant monitoring system
At my job we have constant monitoring systems with ESD wrist straps attached to ESD mats. The way they are supposed to work is when the ESD wrist strap is attached, if the connection with the skin is ...
- 131