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Teledyne API T801 NDIR CO2 Analyzer Operation Manual A Primer on Electro-Static Discharge
225
some conditions, a charge large enough to damage a component can rebuild
in just a few seconds.
Always store sensitive components and assemblies in anti-ESD storage
bags or bins: Even when you are not working on them, store all devices and
assemblies in a closed anti-Static bag or bin. This will prevent induced
charges from building up on the device or assembly and nearby static fields
from discharging through it.
Use metallic anti-ESD bags for storing and shipping ESD sensitive
components and assemblies rather than pink-poly bags. The famous,
pink-poly bags are made of a plastic that is impregnated with a liquid (similar to
liquid laundry detergent) which very slowly sweats onto the surface of the
plastic creating a slightly conductive layer over the surface of the bag.
o While this layer may equalizes any charges that occur across the whole
bag, it does not prevent the build up of static charges. If laying on a
conductive, grounded surface, these bags will allow charges to bleed
away but the very charges that build up on the surface of the bag itself
can be transferred through the bag by induction onto the circuits of your
ESD sensitive device. Also, the liquid impregnating the plastic is
eventually used up after which the bag is as useless for preventing
damage from ESD as any ordinary plastic bag.
o Anti-Static bags made of plastic impregnated with metal (usually silvery in
color) provide all of the charge equalizing abilities of the pink-poly bags
but also, when properly sealed, create a Faraday cage that completely
isolates the contents from discharges and the inductive transfer of static
charges.
o Storage bins made of plastic impregnated with carbon (usually black in
color) are also excellent at dissipating static charges and isolating their
contents from field effects and discharges.
Never use ordinary plastic adhesive tape near an ESD sensitive device or
to close an anti-ESD bag. The act of pulling a piece of standard plastic
adhesive tape, such as Scotch
®
tape, from its roll will generate a static charge
of several thousand or even tens of thousands of volts on the tape itself and an
associated field effect that can discharge through or be induced upon items up
to a foot away.
13.4.2. BASIC ANTI-ESD PROCEDURES FOR ANALYZER REPAIR AND
MAINTENANCE
13.4.2.1. WORKING AT THE INSTRUMENT RACK
When working on the analyzer while it is in the instrument rack and plugged into
a properly grounded power supply
1. Attach your anti-ESD wrist strap to ground before doing anything else.
Use a wrist strap terminated with an alligator clip and attach it to a bare metal
portion of the instrument chassis. This will safely connect you to the same
ground level to which the instrument and all of its components are connected.
2. Pause for a second or two to allow any static charges to bleed away.
07274B DCN6418