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Based in. Northern California since 1971. Founded JSK Associates in 1979. Actively involved in soldering, cleaning, chemistries. 30 years experience in EOS/ESD control.
Jerry Karp has submitted responses to the following questions.
Stainless Steel Benches and ESD
The use of SS or metal benches is dangerous to your component and more so to your employees. Stainless steel ...
PCBA Inspection Process Causing Damage
I am not aware of any specific studies that were done on the movement of a PCB on a "relatively" ...
Stencil Cleaning Frequency
I would recommend you obtain, IPC-7526, which covers all aspects of stencil cleaning... ...
Ionic contamination testing is still the most cost effective method available.. There are several commercial systems available. See this spec: ...
Exposed Copper Risk
Absolutely.. Bare copper? Ever leave a penny outside? Green in no time.. Either go with conformal coating for the entire board, ...
Control Electronic Static Discharge
If you are referring to ESD events caused by the motion of the handling devices then the only method is ...
Contamination Using Solvent Dispensers
What type of solvent dispenser are you using? There are products on the market that prevent the solvent from being ...
MSD Components Baked Too Long
The answer begs the question. Are you asking because you have already baked the parts at the longer stated time ...
Production Floor Temperature and Humidity Loggers
First & foremost...."your customer audit" They are making the request. Customers are hard to come by. Monitors are relatively inexpensive. ...
ESD Grounding - 1 Meg Ohm Resistor
The resistor protects the operator from becoming the path to ground in the event there is contact with live voltages. ...
Soldering Station Calibration
A lot depends upon the type of station utilized. Is it a military application? If so there are different requirements. ...
ESD Conductive Floor Tile Worry
Any time there is a high voltage situation the operator should be isolated/insulated from the potential to be the path ...
Selective Printing for BGA Components
At what cost to the integrity , structural, of the component. Could you do it... sure. Should you do it ...
PCBA Transport Between Facilities
The movement of PCB's from one facility to another presents a set of circumstances requiring special handling procedures. I ...
ESD and Humidification
Additional humidification of an assembly area is not necessarily required when other measures are in place. Obviously, it is imperative ...
Spotting After DI Water Cleaning
Have you changed flux? There is something obviously fouling the beds if they are going bad in 2 weeks. Having ...
Long Term Component Storage
My first question would be "why do you need to store components for 10 years". I am going to assume ...
Solder Paste Life on the Stencil
Simplicity is always the way to go in my opinion. Are you seeing issues related to leaving the paste on ...
Zip-lock Bags vs. Heat Sealed Bags
The correct answer would be no. From the fact that air cannot be fully evacuated from a zip lock ...
Silver Solder for Audio Circuits
I would venture to say following. If you are an OEM then I don't see that Silver solder is going ...
Improve DPPM for Wave Soldering Using Nitrogen
In all probability, yes. Nitrogen will significantly reduce the amount of "air" contacting your PCB, dependent on the quality & ...
Deionized Water Sample Testing
You indicate that you are getting a reading of 15 mOhms. Is that at the discharge from the point where ...
Wire Tinning Dispute
When tinning wire it has always been my understanding that no solder should "creep" under the insulation. Solder flowing under ...
Mixing Different SAC305 Solders
As long as the assay reports on the two different vendors materials are of the same chemical levels there should ...
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