CalAmp 4230HBT Manual De Usuario
1/28/2015
LMU42x0 Hardware & Installation Guide PULS Wiki
https://puls.calamp.com/wiki/LMU42x0_Hardware_%26_Installation_Guide
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Electrostatic Discharge (ESD)
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at
different electrical potentials caused by direct contact or induced by an electrostatic field. The term is usually
used in the electronics and other industries to describe momentary unwanted currents that may cause damage to
electronic equipment.
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at
different electrical potentials caused by direct contact or induced by an electrostatic field. The term is usually
used in the electronics and other industries to describe momentary unwanted currents that may cause damage to
electronic equipment.
ESD Handling Precautions
ESD prevention is based on establishing an Electrostatic Protective Area (EPA). The EPA can be a small
working station or a large manufacturing area. The main principle of an EPA is that there are no highly
charging materials in the vicinity of ESD sensitive electronics, all conductive materials are grounded, workers
are grounded, and charge buildup on ESD sensitive electronics is prevented. International standards are used
to define typical EPA and can be obtained for example from International Electrotechnical Commission (IEC)
or American National Standards Institute (ANSI).
ESD prevention is based on establishing an Electrostatic Protective Area (EPA). The EPA can be a small
working station or a large manufacturing area. The main principle of an EPA is that there are no highly
charging materials in the vicinity of ESD sensitive electronics, all conductive materials are grounded, workers
are grounded, and charge buildup on ESD sensitive electronics is prevented. International standards are used
to define typical EPA and can be obtained for example from International Electrotechnical Commission (IEC)
or American National Standards Institute (ANSI).
This ESD classification of the sub assembly will be defined for the most sensitive component, therefore the
following classifications apply:
following classifications apply:
Class 1B – Human Model (< 1 kV)
Class M1 – Machine Model (< 100V)
Class M1 – Machine Model (< 100V)
When handling the LMU42x0’s™ mainboard (i.e. sub assembly) by itself or in a partial housing proper ESD
precautions should be taken. The handler should be in an ESD safe area and be properly grounded.
precautions should be taken. The handler should be in an ESD safe area and be properly grounded.
GPS Ceramic Patch Handling
When handling the sub assembly it may be natural to pick it up by sides and make contact with the antenna
boards. In an uncontrolled ESD environment contact with the center pin of ceramic patch antenna can create a
path for electrostatic discharge directly to the GPS Module. The GPS Module is very sensitive to ESD and can
be damaged and rendered nonfunctional at low levels of ESD.
When handling the sub assembly it may be natural to pick it up by sides and make contact with the antenna
boards. In an uncontrolled ESD environment contact with the center pin of ceramic patch antenna can create a
path for electrostatic discharge directly to the GPS Module. The GPS Module is very sensitive to ESD and can
be damaged and rendered nonfunctional at low levels of ESD.
One should avoid contact with the center pin of the patch during handling. The Factory will be placing a
protective layer of Kapton® tape over the patch element to eliminate this ESD path.
protective layer of Kapton® tape over the patch element to eliminate this ESD path.
Packaging
Anytime the sub assembly is shipped and it is not fully packaged in its final housing it must be sealed in an
ESD safe bag.
Anytime the sub assembly is shipped and it is not fully packaged in its final housing it must be sealed in an
ESD safe bag.
Electrical OverStress (EOS)
The GPS receiver can be damaged if exposed to an RF level that exceeds its maximum input rating. Such
exposure can happen if a nearby source transmits an RF signal at sufficiently high level to cause damage.
The GPS receiver can be damaged if exposed to an RF level that exceeds its maximum input rating. Such
exposure can happen if a nearby source transmits an RF signal at sufficiently high level to cause damage.
Storage and Shipping
One potential source of EOS is proximity of one LMU42x0™ GPS Antenna to another LMU42x0™ GSM
Antenna. Should one of the units be in a transmit mode the potential exists for the other unit to become
damaged. Therefore any LMU42x0™ GPS Antenna should be kept at least four inches apart from any active
LMU42x0™ GSM Antenna or any other active high power RF transmitter with power greater than 1 Watt.
One potential source of EOS is proximity of one LMU42x0™ GPS Antenna to another LMU42x0™ GSM
Antenna. Should one of the units be in a transmit mode the potential exists for the other unit to become
damaged. Therefore any LMU42x0™ GPS Antenna should be kept at least four inches apart from any active
LMU42x0™ GSM Antenna or any other active high power RF transmitter with power greater than 1 Watt.