Electrostatic Discharge; Identification Of Electrostatic Discharge Sensitive Components; Handling Electrostatic Discharge Sensitive Components; Model 3060 Installation - Lakeshore 335 User Manual

8.11 Electrostatic
Discharge
8.11.1 Identification of

Electrostatic Discharge

Sensitive Components
8.11.2 Handling
Electrostatic Discharge
Sensitive Components
8.12 Model 3060
Installation
Electrostatic Discharge (ESD) may damage electronic parts, assemblies, and equip-
ment. ESD is a transfer of electrostatic charge between bodies at different electro-
static potentials caused by direct contact or induced by an electrostatic field. The
low-energy source that most commonly destroys Electrostatic Discharge sensitive
devices is the human body, which generates and retains static electricity. Simply
walking across a carpet in low humidity may generate up to 35,000 V of
static electricity.
Current technology trends toward greater complexity, increased packaging density,
and thinner dielectrics between active elements, which results in electronic devices
with even more ESD sensitivity. Some electronic parts are more ESD sensitve than
others. ESD levels of only a few hundred volts may damage electronic components
such as semiconductors, thick and thin film resistors, and piezoelectric crystals dur-
ing testing, handling, repair, or assembly. Discharge voltages below 4000 V cannot be
seen, felt, or heard.
The following are various industry symbols used to label components as
ESD sensitive.
FIGURE 8-8 Symbols indicating ESD sensitivity
Observe all precautions necessary to prevent damage to ESDS components before
attempting installation. Bring the device and everything that contacts it to ground
potential by providing a conductive surface and discharge paths. As a minimum,
observe these precautions:
De-energize or disconnect all power and signal sources and loads used with unit.
D
Place unit on a grounded conductive work surface.
D
Technician should be grounded through a conductive wrist strap (or other device)
D
using 1 M series resistor to protect operator.
Ground any tools, such as soldering equipment, that will contact unit. Contact
D
with operator's hands provides a sufficient ground for tools that are otherwise
electrically isolated.
Place ESD sensitive devices and assemblies removed from a unit on a conductive
D
work surface or in a conductive container. An operator inserting or removing a
device or assembly from a container must maintain contact with a conductive
portion of the container. Use only plastic bags approved for storage of
ESD material.
Do not handle ESD sensitive devices unnecessarily or remove them from the
D
packages until they are actually used or tested.
The Model 3060 is field-installable. You will need a small Phillips-head screwdriver
and the 5/64-in hex driver. Follow this procedure to install the 3060 option.
To avoid potentially lethal shocks, turn off controller and disconnect it from AC power
before performing these procedures.
The Model 3060 option card is field installable; however, do not attempt to service other
parts of the instrument as they are not user-serviceable. Failure to comply could result in
injury or death to the operator.
8.11 Electrostatic Discharge
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