Navigation device (receiver)
NAVIA
GNSS - KL 3333
Operation manual 2.0
22
ESD protection
GPS navigation device - KL3333 in the form of boards, and as a navigational device's
reception (receiver) NAVIA GNSS - KL3333 products are sensitive to electrostatic discharge.
Before using the product you should carefully review the requirements for protection
against electrostatic discharge!
Navigating equipment and receivers NAVIA GNSS - KL3333 equipped with protection
circuits against electrostatic discharges, but non-compliance with the requirements for working
with ESD -sensitive products can be generated voltage exceeds the capacity of the protective
circuits. It should be borne in mind that the voltage of static electricity depends strongly on the
relative humidity (% RH), and materials with which the worker contacts.
Approximate values of static electricity generated
•
The voltage
10-25% RH 65-90% RH
•
Stroke the floor covered
-
Vinyl tile
6,000 V
100 V
-
Carpets or carpeting
35,000 V
1,500 V
-
Conventional linoleum
12,000 V
250 V
-
Antistatic linoleum 100 V (max) 20 V (max)
•
An employee at the table
-
Standard covers
6000 V
100 V
-
Antistatic coating 50 V (max) 10 V (max)
•
A chair with nylon seat
18,000 V
1,500 V
•
Plastic bag taken from the table
20,000 V
1,200 V
Red
marked voltage values exceed the capabilities of ESD protection products on the air
breakdown on the screen of the receiver,
brown
- for other conclusions.
If there is no galvanic contact between the local ground (for example, the surface of the
desktop, instrumentation, etc.) and circuit ground (GND) of PCB with mounted receiver, the first
action in the work with the board to be providing such contact. It is forbidden to use the receivers
with ungrounded equipment and/or devices.
Before connecting the antenna to the receiver should ensure that there is the connection of
the grounding terminal of the antenna to the board terminal device and/or receiver. That is
unacceptable to use interface, which is possible by contacting the first signal terminal (central
core) and then through the ground terminal (shield), for example, type connectors F. It is
recommended that the use of types of connectors SMA, MMCX, and the like.
Touching antenna input should avoid contact with any charged product (e.g., a ceramic
antenna has a capacitance of about 50…100 pF, coaxial cable has a capacitance 50 ... 100 pF/ m,
a soldering iron may have a capacity of up to 10nF, etc.). Also you should be careful in contact
with materials which can generate and/or store charge. Very good results in the fight against a
static electric charge enables the use of a grounded wrist equipment (mats on the desktop,
grounding straps, anti-static gloves, anti-static flooring, shoes) and using in the workroom air
ionizer, especially in winter.
At any stage of transportation, storage, warehouse for processing, installation,
operation, dismantling and other works with the receiver should be taken appropriate
measures to protect against electrostatic discharge (ESD protection).
