Good idea Chet. I wish we'd done that. I will be updating our numbering system and when I do,
this will be added. We didn't use letters initially but soon we changed when we had to deal with
resistors like 0.1 ohms (added the R for the decimal point).
Is there a published listing of the MMM where I can grab a copy?
Bob Landman
H&L Instruments, LLC
On Aug 27, 2010, at 8:20 AM, Harner, Chester wrote:
> The Military part number system has provided this kind of part number
> for more years than I care to admit to: and most manufactures use
> similar type part numbers, all using the Military codes for tolerance:
> T=.01%, A = .05%, B = 0.1%, D = 0.5%, F = 1.0%, g = 2.0% and J=5.0%.
>
> I have set up PN systems for several companies and all were based on the
> Military/Manufacturer Model and seem to work well. The part number is
> readable, can put parts together on the shelves etc.
>
> Chet Harner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
> Sent: Thursday, August 26, 2010 3:21 PM
> To: [log in to unmask]
> Subject: Re: [TN] Resistor part numbers
>
> Consider using a log scale for the numeric value unless it needs to be
> human
> readable.
>
> Bob Kondner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
> Sent: Thursday, August 26, 2010 4:38 PM
> To: [log in to unmask]
> Subject: Re: [TN] Resistor part numbers
>
> I appreciate that there are possibly better ways to do things. There
> are both pros and cons to the way we choose. Right now we are not
> looking to change our PN system. That is a huge project in itself, and
> would take months and $$$ to implement. At the moment our system works
> and has worked for this company for over 20 years.
> I am just looking for some quick and dirty ideas how someone else with a
> similar PN system might choose or has chosen to name a PN for 0.1%
> precision.
>
> -----Original Message-----
> From: Robert Kondner [mailto:[log in to unmask]]
> Sent: August 26, 2010 2:32 PM
> To: 'TechNet E-Mail Forum'; Genny Gibbard
> Subject: RE: [TN] Resistor part numbers
>
> Genny,
>
> I have lived and breathed this part number stuff for about 20 years.
>
> I would bet your immediate reason for using a semi-intelligent part
> number system is so you can find things. Most apps give you a big list
> and you need to run down that list finding something.
>
> The second main use for the part number is having a unique ID that
> allows a specific part with specific characteristics to be specified in
> a list(BOM).
>
> What folk do is merge these two requirements into a single
> semi-intelligent part number. Problem is that naming system eventually
> needs to be reorganized but since the part numbers are in use you are
> stuck. With two people doing the "Naming" things also can run amuck.
>
> It does not have to be this way. What you can do depends on what
> existing data system you have in place and how far outside the box you
> are willing to go.
>
> Contact me off line bob <funny a in circle> kondner period com
>
> Thanks,
> Bob Kondner
> 410-821-1315
> Index Designs
> Baltimore Maryland USA 21286
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
> Sent: Thursday, August 26, 2010 4:04 PM
> To: [log in to unmask]
> Subject: [TN] Resistor part numbers
>
> We use a semi-intelligent internal PN system. To date, our resistors
> are usually 5% or 1%. For 5%, we use 2 sig digits plus a multiplier
> digit for the value, plus a letter code to indicate size. For 1%, we
> use 3 sig digits plus a multiplier plus the letter code.
> We now have a requirement to make some 0.1% resistor part numbers. We
> are struggling with how to define it in our system. The thought was to
> do 4 digits plus a multiplier, but to add to the confusion, the parts
> are 1K and 2K21. This would mean the PN would have a number like 10000
> for 1K and 22100 for 2K21.
> Does anyone have any other ideas?
>
> Genny
>
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