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Archive for November 3rd, 2016

HP 7475A Plotter: 09872-60066 Digitizing Sight

I found this antique on eBay for (somewhat) under HP’s 1980-era $35 price:

HP 09872-60066 Digitizing Sight - overview

HP 09872-60066 Digitizing Sight – overview

The prevailing price for HP 09872-60066 Digitizing Sights seems to be $100 and upwards, with outliers in both directions, so I just couldn’t pass it up.

Anyhow, the fiber optic pipe still works just like it did, back in the day:

HP 09872-60066 Digitizing Sight - text target

HP 09872-60066 Digitizing Sight – text target

The small dot in the middle is actually a paint-filled indentation on the bottom surface:

HP 09872-60066 Digitizing Sight - bottom detail

HP 09872-60066 Digitizing Sight – bottom detail

With the bottom flat on the target, the relayed image is in perfect focus:

HP 09872-60066 Digitizing Sight - top detail

HP 09872-60066 Digitizing Sight – top detail

The bezel recesses the top surface by 25 mil to protect the imaging plane.

OK, it’s a gadget gloat; I have absolutely no intention of ever chucking a piece of paper in the plotter and digitizing any points.

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