UV erasers /Re: Blankety blank blank.

[Walter Petermann]

Shannen Durphey wrote:
> 
> Well, since I've read that an ultra violet lamp can erase
> eproms, I tried it.  Set a timer for 3 mins with my lamp on
> the chip,checked it with the burner, not blank.  5 mins, 10
> mins, 20 mins; not blank.  Got to "The heck with it" and
> left it on for an hour (with six chips under it), still not
> blank.  What gives?
> 
> Lamp reads "UV-A Ultra Violet" and "BLE-270W". Wrong
> frequency? 
....


270W Holy $@&% ! 
Took my DataraseII apart and it has a 4W bulb. It
takes about 10-15mins to erase eproms that are about 1/4
inch from the lamp. The light it emits is a light blue
color.

>From a web search:
UV-A 320-400nm (weakest)
UV-B 290-320nm
UV-C 260-290nm (strongest)

My National data book says that erasure starts at wavelengths
below 400nm, but the recommended light source is 254nm (UV-D?). 

  Walter

PS Found this list of UV lamp suppliers

Edmund Scientific Co.
101 East Glouchester Pike
Barrington, NJ 08007-1380, USA

Hanovia Lamp Division
Emglehardt Hanovia, Inc.
100 Chestnut Street
Newark, NJ 07105, USA

Harkshaw Scientific
1945 East 97th Street
Cleveland, Ohio 44106, USA

Matheson Scientific
1850 Greenleaf Avenue
Elk Grove Village, IL 60007, USA

Ultra-Violet Products, Inc.
5114 Walnut Grove Avenue
San Gabriel, CA 91778, USA