We search for industry news, so you don't need to.
Jerry Karp

■  Ask the Experts Index
■  Submit a Question
■  Experts Panel Index
■  Join the Panel

Ask the Experts Search

image
President
JSK Associates

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.
Looking for Long-term Component Storage Options
10 years... Wow. Are these IC's in the original tubes? Hopefully they were provided in ESD compliant products. From moisture ...
ESD Ground Wire Gauge
18 gauge stranded wire is commonly utilized for grounding. The center screw on an outlet is the preferred contact , ...
Pad Missing ENIG Plating
It's the fabricators problem, not yours.. return the entire batch as "rejected, does not meet spec". ...
Adding Chlorine to a DI (Deionization) Water System
Time out! First of all adding anything to your DI system will kill your DI beds. Chlorine, especially, what you ...
Reflow Oven - 5 Zone or 8 Zone
An age old question... How many zones do I need. Speed, profile, components, etc. Personally I will defer to my ...
Moisture Sensitive Components in Flooded Storage Facility
OK, so we know that these components were exposed to excessive moisture for an extended period of time. My belief ...
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 anyspecific studies that were done on the movement of a PCB on a"relatively" hard mat ...
Stencil Cleaning Frequency
I would recommend you obtain, IPC-7526, which covers all aspects of stencil cleaning... ...
Cleanliness Testing
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 ...
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 highvoltage situation the operator should be isolated/insulated from the potentialto be the path to ground. ...
Selective Printing for BGA Components
At what cost to theintegrity , structural, of the component. Could you do it... sure. Should youdo it ... no. ...
PCBA Transport Between Facilities
The movement of PCB'sfrom one facility to another presents a set of circumstances requiring specialhandling procedures. I will assume that ...
ESD and Humidification
Additionalhumidification of an assembly area is not necessarily required when othermeasures are in place. Obviously, it is imperative that the ...
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 sold recirc ...
Long Term Component Storage
My first question wouldbe "why do you need to store components for 10 years". I am going toassume that this ...
Solder Paste Life on the Stencil
Simplicity is always theway to go in my opinion.Are you seeing issuesrelated to leaving the paste on the stencil for ...
Zip-lock Bags vs. Heat Sealed Bags
The correct answer wouldbe no. From the fact that aircannot be fully evacuated from a zip lock ESD compliant bag ...
Silver Solder for Audio Circuits
I would venture to sayfollowing.If you are an OEMthen I don't see that Silver solder is going to make that ...
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 youare getting a reading of 15 mOhms. Is that at the discharge from the pointwhere the water ...
Wire Tinning Dispute
When tinning wire it hasalways been my understanding that no solder should "creep" under theinsulation.Solder flowing under thejacketing on a ...
Mixing Different SAC305 Solders
As long as the assay reports on the twodifferent vendors materials are of the same chemical levels there should be ...