Calibrating for Product Integrity

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t.alex
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Re: calibrated equipment is key to great products
t.alex   12/2/2012 5:56:23 AM
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Douglas, unfortunately no I don't remember such VOM :)

Douglas Alexander
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Douglas Alexander   11/29/2012 9:16:07 PM
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@Prabhakar...I can bet that the calibration folks had to move quickly when it came time for the tune-ups. If your capital equipment cost several hundreds of thousands of dollars as in the case of numericaly controlled (NC), then it cost real money just to have any down time at all.

prabhakar_deosthali
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prabhakar_deosthali   11/29/2012 12:40:27 AM
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Douglas, The kind of locks we had put in the software systems  for job loading on the machine tools in a automobile company. The system would keep track of the no of jobs done on a particular machine and generate alerts for calibration of tools whenever the set limit was about to be reached. If the limit was reached the software would block any loading of the jobs on that machine.

Since the operators would totally rely on the computed generated job slips, the machines on which the tools were not recalibrate would remain idle  and the shop supervisors would immediately notice the same

The calibration was done in house by the standards laboratory whic would also do the inspection of the finished jobs.

As far as some electronic equipment was concerned it had to be sent to outside party for calibration.

Douglas Alexander
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Re: calibrated equipment is key to great products
Douglas Alexander   11/28/2012 10:13:06 AM
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@prabhakar...what kind of equipment could you lock out users? Would that stop a line sometimes? Did you have the calibration done in house? We had to send spectrum analyzers and BER and the like back to the manufactures or use a dedicated outside calibration company that had been certified on each piece of equipment. It was not cheap and only got more expensive over time. How did your company manage calibrations?

prabhakar_deosthali
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Re: calibrated equipment is key to great products
prabhakar_deosthali   11/28/2012 2:11:04 AM
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Yes Douglas , I am from that era of Analog when we used to short the probes of a VOM and calibrate it to show a Zero.

While I was working in the controls lab of an Atomic test lab we had a predefined routine in which the schedule for calibrating each instrument was defined. A lot of these instruments were Analog .

Later while working in an automobile company as IT manager , we had put locks in the system to lock loading of jobs on a particular machine if its tools were due for recalibration.

As you say Calibration of instruments is a very important function in any production facility and a separate calibration lab and calibration staff is a must.

Douglas Alexander
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Re: calibrated equipment is key to great products
Douglas Alexander   11/27/2012 8:51:16 PM
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@t.alex...You are right. Any product that requires an active signal, digital or analog, output to the outside world or even just internally, is subject to being measured against a test specification. The only way to be certain that the specification has been met is to confirm the accuracy and up-to-date-ness of the calibration for the test gear. Mechanical measurements also need calibration as some are electronically based or even subject to wear and tear over time. Hand held digital or mechanical calipers should be zeroed before measurements. Are you old enough to remember the analog VOM that would be calibrated by holding the probes together and setting the needle to zero? I am not old enough to remember that. Yes I am. 

t.alex
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calibrated equipment is key to great products
t.alex   11/27/2012 8:21:49 PM
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I understand a number of electronic products require good calibrated instruments during the development phase for things to work correctly. Products like cellphones or those for wireless communication, wifi, etc. depend a great deal on this. 



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