Electronics > Beginners

Can you tell what size resistors there are?

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langwadt:

--- Quote from: james_s on September 25, 2021, 12:01:36 am ---It's certainly possible to measure without calipers, but I would say that calipers are the correct tool to measure such things, and enable doing so quickly and easily. In addition they are perfect for measuring parts you have in your hand while you are drawing a PCB layout for them. Given the low cost of an entry level caliper there is not much reason to not own one.

Friends of mine have owned a machine shop for years and they have some very nice calipers and other precision measurement tools. Most of the time they keep those locked up in the toolbox in the QA lab though, out on the floor most of the guys use a cheap set for day to day stuff. The cheap calipers are accurate enough for most jobs, and they're a lot cheaper to replace than the Japanese ones that are damaged just as easily if dropped or abused.

--- End quote ---


and if you ask most machinists they will probably tell you that calipers are not what you use for precision measurements

TimFox:
Resolving the difference between 0603, 0805, and 1206 packages is not tool-room quality metrology.

ThermallyFrigid:
I have a HarborFreight Digital caliper.

Problem is, every time I measure it I can get a big enough difference to make it either 0805 or 1206.  Fractions of a mm.

If you can "accurately" measure within 1/10 of a mm consistently on a soldered SMD component less than 2mm on a side, , my hat's off to you.  You have me beat.

james_s:

--- Quote from: langwadt on September 25, 2021, 01:34:13 am ---and if you ask most machinists they will probably tell you that calipers are not what you use for precision measurements

--- End quote ---

It depends on your definition of precision. Calipers are more precise than a machinists scale which is more precise than a tape measure, ruler or other measuring device the typical person is going to have but obviously they are not the ultimate in precision. They have a whole inspection lab that is climate controlled with all the expensive measuring devices but out on the shop floor there's a scale and a caliper at every machine station.

james_s:

--- Quote from: ThermallyFrigid on September 25, 2021, 03:34:26 am ---I have a HarborFreight Digital caliper.

Problem is, every time I measure it I can get a big enough difference to make it either 0805 or 1206.  Fractions of a mm.

If you can "accurately" measure within 1/10 of a mm consistently on a soldered SMD component less than 2mm on a side, , my hat's off to you.  You have me beat.

--- End quote ---

If you can't get it to consistently measure the difference between 0805 and 1206 there is something wrong with it. Mine can do it easily and is very consistent. I don't typically measure SMD chip components since I can eyeball the common sizes but I do use it frequently to measure pin pitch and diameter.

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