B&K Precision 851 - Manual - Manual (Page 4)

4
Specifications
Timer Setting:
30 minutes
Power Supply: 100 – 120VAC 50/60 Hz
UV Bulb Wattage: 10 W
Dimensions: 15.5 x 6 x 3.25” (394 x 150 x 80mm)
Weight: 8.8 lbs. (4 kg)
The 851 is shipped with:
• AC Power Cord
• Instruction Manual
NOTE: Specifications and information are subject to change without notice. Please visit
www.bkprecision.com for the most current product information.
Operational Overview
The 851 was designed with safety in mind. The user cannot be exposed to UV radiation or main
voltages. The metal casing is heavy duty and the advanced design of the chip drawer means that UV
radiation can never be a hazard. EPROM's, too are cared for. They are protected from electrostatic
damage by special conductive foam, which lines the chip drawer.
Before connecting the unit to the AC power source, confirm that the AC voltage value matches the
voltage value labeled on the unit. Improper AC voltage will cause serious damage to the unit.
Open the drawer and place the EPROM chips to be erased on the anti-static carbon pad. The 851
will erase up to 40; 24-pin EPROM's simultaneously.
Close the drawer and rotate the timer clockwise to set the erasing time. For new chips, allow 10- 1
5 minutes to erase, For frequently used chips, allow 20-25 minutes or even longer. Usually 30
minutes is adequate to erase even the most stubborn EPROM. You cannot damage an EPROM by
''over-erasing'' or exposing it too long, however, you can damage it by erasing it too many times.
Most EPROM's are good for a few hundred erase/write cycles and some permit many times that
amount. An EPROM that is erased has OXFF (255 decimal) in every memory location so it's easy to
tell if it is erased or not.
When the eraser is working, the power lamp (LED) will light up, the wavelength of the UV lamp
operates at 253.7nm (2537 Angstroms). Intel recommends this value for the erasure of their
EPROM's. When the setting time expires, the unit will generate a time-off bell to conveniently
remind the user that the cycle has been completed.
The 851 features a power safety switch located inside the drawer. When the drawer is opened, the
unit will automatically shut off to prevent the UV light leakage from harming the user's eyes.
Although the 851 has safety features to reduce the risk of exposure, the user should still use the 851
with care.