Tektronix Preventing ESD,EOS Damage User manual

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Terms

This document provides guidelines that will help you reduce the risk of
electrostatic discharge (ESD) or electrical overvoltage stress (EOS) damage to
your high-precision sampling module.

The following terms are used in this document:

DUT

ESD

EOS

Sampling Head

Static-Sensitive

Component

Device under test.

ESD (electrostatic discharge) is the momentary discharge of electricity between
objects that are at different potentials. ESD can have amplitudes in hundreds or
even thousands of volts. A single ESD event can cause the sampling head to fail.

EOS (electrical overvoltage stress) occurs when an electronic device is subjected
to a voltage level that is slightly higher than its designed limit. EOS damage can
occur at l
causes the sampling head to fail. Standard methods for preventing ESD are not
very effective against EOS damage.

The inp

Any part of the instrument, or anything that connects to the instrument, that
is sensitive to ESD or EOS. This includes modules, connectors, probes, circuit
boards, and components on the circuit boards.

ow voltage levels. EOS damage has a cumulative effect, and over time

ut of the high-precision electrical sampling module.

Preventing ESD and EOS Damage to Your High-Precision Sampling Module

ION. The Tektronix high-precision sampling modules are accurate, sensitive

CAUT

modules. If they are not handled properly, these modules can easily be damaged
by high voltage signals and accidental discharges of electricity (ESD and EOS).
To reduce the risk of damage, obey the following guidelines.

Obey the guidelines on the following pages to reduce the risk of ESD and EOS
damage whenever you handle static-sensitive components and devices. You
should also obey your company’s safe working practices.

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Copyright © Tektronix

*P071258700*

071-2587-00

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Work at a Static-Safe Workstation

The workstation must have a static-controlled work surface.

The floor in front of the workstation must be static-controlled or have a

grounded mat.

Do not allow anything capable of generating or holding a static charge

on the workstation surface.

Place the measurement equipment (and where practical, the device

under test) on static-controlled surfaces.

To minimize the chance of induction charge transients, do not allow
people to walk near your test station unless they are wearing a
grounding coat and footstrap.

Electrically ground the DUT immediately before you connect it to the
sampling module.

Wear ESD-Safe Attire

Wear an antis

Wear an antis
on the front of your instrument.

Either wear antistatic gloves or do not wear gloves.

Wear a Foot

Wear a grounded foot strap.

tatic coat.

tatic wrist strap that is attached to the antistatic connector

Strap

2 Preventing ESD and EOS Damage

Check that You are Properly Grounded

Use a tester to be sure that your antistatic wrist strap and foot strap

are functioning properly.

Handle Modules Properly

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Install 50 Ω

input terminals.

Never install or remove a sampling module while the instrument is

powered on.

Transpor

containers.

Handle

terminators on unused sampling module or TDR module

t and store static-sensitive modules in their static protected

Circuit Boards Properly

Minimize handling of static-sensitive circuit boards and components.

Handle circuit boards by the edges when possible.

Keep circuit boards in static-safe areas.

A circuit board that has not been handled properly can carry a static

charge and should be momentarily grounded before being probed.

Preventing ESD and EOS Damage 3

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Discharge Static from Cables

Momentarily ground the center conductor of the SMA cable before
connecting it to the sampling head or TDR input.

Discharge Static from Probes

Momentaril
connecting it to the SMA cable that is attached to the TDR module.

If the probe is connected to a sampling module or TDR module, and
you are not probing any device under test, ground the probe tip or
place the pr

Immediatel
to the DUT, momentarily ground the DUT to fully discharge any
accumulated static charges.

Do not swipe a live TDR probe across any isolated conductor unless
that surfa

Use a Stati

Proper usage of a static-isolation unit, such as the Tektronix 80A02
EOS/ESD Protection Module shown here, can safely discharge the
residual charges and protect the modules from EOS damages.

Use S tatic-Safe Cleaning Methods

Ground the air hose nozzle to prevent ESD.

Set the pressure to less than 414 kPa (60 psi) to control the velocity of
the air st
connector.

y ground the center conductor of the TDR probe before

obe tip inside a grounded Faraday cage.

y before you connect a live sampling probe or TDR probe

ce has been properly discharged.

c-Isolation Unit

ream. Compressed air can cause ESD when directed into a

4 Preventing ESD and EOS Damage