User`s manual

7800 Series Hysteresisgraph System User's Manual
6-2 Service
6.2 CLEANING
Cleaning of the outer surfaces, while not important to operation of the equipment, is an aesthetic consideration for
the looks of the equipment. Do not use strong, harsh detergents such as powdered cleansers or “all-purpose
cleaners” for cleaning the plastic or painted parts of your equipment. You may use mild cleaners or a mild
detergent soap solution. Use a soft, clean cloth to wipe the surfaces. Wring out any excess liquid from the cloth
before using. Clean the interior of equipment and surface of printed circuit boards (PCBs) with clean, dry air at
low pressure.
WARNING: Do not apply any cleaning fluids while the equipment power is on.
CAUTION: Do not use aromatic hydrocarbons or chlorinated solvents to clean the exterior surfaces of the
instruments. They may react with the plastic materials used in the controller or the silk screen
printing on the back panel.
CAUTION: If an accidental spill should occur, mop up the fluid with a clean cloth and allow the machine to dry
before turning the power ON. If any fluid entered either the controller or computer, it will require
removing the covers to gain access to the interior. Contact your local service personnel or Lake
Shore for recommendations before proceeding.
6.3 ELECTROSTATIC DISCHARGE
Electrostatic Discharge (ESD) may damage electronic parts, assemblies, and equipment. ESD is a transfer of
electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by an
electrostatic field. The low-energy source that most commonly destroys Electrostatic Discharge Sensitive (ESDS)
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 volts 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 ESDS 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 during testing, handling, repair, or
assembly. Discharge voltages below 4000 volts cannot be seen, felt, or heard.
6.3.1 Identification of Electrostatic Discharge Sensitive Components
Below are various industry symbols used to label components as ESDS:
6.3.2 Handling Electrostatic Discharge Sensitive Components
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:
1. De-energize or disconnect all power and signal sources and loads used with unit.
2. Place unit on a grounded conductive work surface.
3. Ground technician through a conductive wrist strap (or other device) using 1 MΩ series resistor to protect
operator.
4. Ground any tools, such as soldering equipment, that will contact unit. Contact with operator's hands
provides a sufficient ground for tools that are otherwise electrically isolated.
5. Place ESDS devices and assemblies removed from a unit on a conductive 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.
6. Do not handle ESDS devices unnecessarily or remove from the packages until actually used or tested.