Installation Guide

(https://www.qualcomm.com/invention/technologies/lte))
LTE is the most current and advanced data technology network for MDT's (mobile data terminals) and other mobile devices, and
an upgrade over
GSM/UMTS and CDMA. LTE frequency bands vary internationally, so it is important to note device configuration will dictate
proper
functionality.
3 Hardware Overview
3.1 Location Messaging Unit-HMU-3640™
3.1.1 HMU-3640™ Handling Precautions
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.
WARNING: This product can expose you to chemicals including carbon black, nickel, & bisphenol A, which are known to the
State of
California to cause cancer and birth defects or other reproductive harm. For more information go to
https://www.P65Warnings.ca.gov.
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 build-up on ESD sensitive electronics is prevented. International
standards are used to
https://puls.calamp.com/wiki/HMU-3640_Hardware_%26_Installation_Guide 5/27
define typical EPA and can be obtained for example from International Electro-technical 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:
Class 1B – Human Model (< 1 kV)
Class M1 – Machine Model (< 100V)
When handling the HMU-3640™’s™ main-board (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.
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 non-functional at low levels of ESD.
One should avoid contact with the center pin of the patch during handling.
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.
Electrical Over-Stress (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.
Storage and Shipping
One potential source of EOS is proximity of one HMU-3640™ GPS Antenna to another HMU-3640™ GSM Antenna. Should one
of the units be
in a transmit mode the potential exists for the other unit to become damaged. Therefore any HMU-3640™ GPS Antenna should
be kept at least
four inches apart from any active HMU-3640™ GSM Antenna or any other active high power RF transmitter with power greater
than 1 Watt.
3.1.2 Battery Back-up devices
Please properly dispose of the battery in any of the CalAmp products that utilize one, do not just throw used batteries, replaced
batteries, or units