Electronics Forum | Mon Sep 28 09:18:30 EDT 1998 | Ben Wilmot
The majority of SMT resistors use the following notation. 10 X eg 153 represents 1k5 resistor The third digit in the sequence denotes the number of zeros to add after the first two digits giving the value in ohms. Many Caps will follow the same nota
Electronics Forum | Thu Mar 08 16:17:59 EST 2007 | stepheniii
Your process makes a bigger difference than the machine. I worked for and OEM with Panasonics. They eliminated all 5% resistors, wider tolerance capacitors, and went with as many dedicated feeders as we could. We also staged jobs. We had one runnin
Electronics Forum | Tue Jun 18 03:16:46 EDT 2013 | mun4o
production lot is 4000pcs.About 70% of capacitors are out of tolerance ( +/-20%).There are 3pcs C=10u per PCB, in different location.Samsung capacitors wich we use are 1,5 years old - i checked this information from our supplier " Rutronik ".I have
Electronics Forum | Fri Jun 14 00:47:17 EDT 2013 | mun4o
Thanks , Reese.Yes , I check the capacitors with C-meter.When measured with C-meter , all capacitors are OK - +/-10% of the value. I can not underst?nd "Note: This is not a summation). Y5V -- -20% of nominal value, -part tolerance, -machine toleranc
Electronics Forum | Mon Aug 23 10:34:09 EDT 1999 | Greg Jones
I am looking for a rule of thumb regarding the maximum ramp standard components (chip capacitors) can tolerate without failure during the reflow process. The standard seems to be 3C\second, but this figure is generally derived from the average ramp
Electronics Forum | Tue Feb 26 11:31:38 EST 2013 | stephendo
Do you have any components that don't come off the machine? It sounds like you work for an OEM, not a CM. I used to work for an OEM with similiar changeover numbers as you. I had them make a list of very common parts that never came off the machine.
Electronics Forum | Tue Nov 12 12:49:55 EST 2002 | dragonslayr
Use an "LCR" (L= inductance, C= capacitance, R= Resistance)meter. There are several name brands to choose from (Fluke, etc.) Hand held units are relatively inexpensive. In fact, you may consider having more than one available. Receiving inspection s
Electronics Forum | Fri Sep 24 11:08:13 EDT 2004 | davef
We're not sure what you mean by temperature sensitive components. From an assembly process stand-point, every component we use is temperature sensitive to one level or another. More specifically, some of our products use polyphenylene sulfide (PPS)
Electronics Forum | Tue Aug 31 20:41:45 EDT 1999 | Dreamsniper
| | I am looking for a rule of thumb regarding the maximum ramp standard components (chip capacitors) can tolerate without failure during the reflow process. The standard seems to be 3C\second, but this figure is generally derived from the average r
Electronics Forum | Wed Apr 28 20:57:22 EDT 2021 | stephendo
It will be tough to get a good line for that cost. You might want to start by looking at Mydata and Juki for the machines. Ekra for the screen printer and Heller for the oven is where you might want to start. If you have not already you might want
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