ETS 4431T Manuel utilisateur
Model 4431T Shielded Bag Test System - Operating Manual 1 D00003 Rev. K.
SHIELDED BAG TEST SYSTEM
Turnkey ESD Energy & Voltage Test
Model 4431T – Software Revision H
Operating Manual – Revision K
© 2020 - Electro-Tech Systems, Inc
Model 4431T Shielded Bag Test System - Operating Manual 2 D00003 Rev. K.
Table of Contents
IMPORTANT SAFETY INSTRUCTIONS .......................................................................................................................... 3
1.0 INTRODUCTION ................................................................................................................................................... 5
2.0 EQUIPMENT DESCRIPTION .................................................................................................................................. 6
4.0 ENERGY TESTING - TEST METHODS .................................................................................................................... 9
5.0 ENERGY TESTING - SET-UP ................................................................................................................................. 12
6.0 ENERGY TESTING – MANUAL MODE ................................................................................................................ 13
7.0 ENERGY TESTING - AUTOMATIC MODES .......................................................................................................... 15
APPENDIX A – Waveform Verification ...................................................................................................................... 26
APPENDIX B - Communications via the USB ports. .................................................................................................. 27
APPENDIX C – COMPUTER SETUP ............................................................................................................................. 29
APPENDIX D – ETS4431 File Formats ....................................................................................................................... 30
WARRANTY ............................................................................................................................................................... 31
Document Revision History:
D000003 Rev. H released 2017/03/15 with Ets4431 Test Manager software revision H.
D000003 Revision G released 2016/12/08 with ETS4431T Test Manager software revision G.
D000003 Revision F released 2016/08/10 with ETS4431T Test Manager Software revision F.
Original ETS 4431 Operating manual released 2013/10.
Model 4431T Shielded Bag Test System - Operating Manual 3 D00003 Rev. K.
IMPORTANT SAFETY INSTRUCTIONS
WARNING:
Equipment
contains
High Voltage.
The equipment described in this Manual is designed and manufactured to operate within defined
design limits. Any misuse may result in electric shock, damage to equipment, or fire. To prevent these
unwanted events, the following rules should be observed for installation, use and maintenance. Read
the following safety instructions before operating the instrument. Retain these instructions in a safe
place for future reference.
POWER
POWER CORD: Use only the power cord specified for this equipment and certified for the country of
use. If the power (mains) plug is replaced, follow the wiring connections specified for the country of
use. When installing or removing the power plug hold the plug, not the cord.
The power cord provided is equipped with a United States standard 3-prong grounded plug (a plug
with a third grounding pin). This is both a safety feature to avoid electrical shock and a requirement
for correct equipment operation. If the outlet to be used does not accommodate the 3- prong plug,
either change the outlet or use a grounding adapter.
FUSES: Replace fuses only with those having the required current rating, voltage and specified type
such as normal blow, time delay, etc. DO NOT use makeshift fuses or short the fuse holder. This could
cause a shock or fire hazard or severely damage the instrument.
POWER LINE VOLTAGE (MAINS): If the line (mains) voltage is changed or isolated by an
autotransformer the common terminal must be connected to the ground (earth) terminal of the power
source.
OPERATION
CAUTION:
All equipment designed to simulate a high voltage electrostatic discharge, including the Model 4431
Shielded Bag Test System, utilizes high voltage, high frequency pulses. The basic nature of an ESD
event will result in electromagnetic radiation in addition to the high level, short duration current pulse.
Therefore, personnel with a heart pacemaker must not operate the instrument or be in the
vicinity while it is being used.
DO NOT OPERATE WITH COVERS OR PANELS REMOVED. Voltages inside the Model 4431 can be
as high as 2,000 V. In addition, equipment may contain capacitors up to 100pF charged to 2kV.
Capacitors can retain a charge even if the equipment is turned off.
DO NOT OPERATE WITH SUSPECTED EQUIPMENT FAILURES. If any odor or smoke becomes
apparent turn off the equipment and unplug it immediately. Failure to do so may result in electrical
shock, fire, or permanent damage to the equipment. Contact the factory for further instructions.
DO NOT OPERATE IN WET/DAMP CONDITIONS: If water or other liquid penetrates the equipment,
unplug the power cord and contact the factory for further instructions. Continuous use in this case may
result in electrical shock, fire or permanent damage to the equipment.
Model 4431T Shielded Bag Test System - Operating Manual 4 D00003 Rev. K.
DO NOT OPERATE IN HIGH HUMIDITY: Operating the equipment in high humidity conditions will
cause deterioration in performance, system failure, or present a shock or fire hazard. Contact the
factory for further instructions.
DO NOT OPERATE IN AREAS WITH HEAVY DUST: Operating the equipment in high dust
conditions will cause deterioration in performance, system failure, or present a shock or fire hazard.
Contact the factory for further instructions.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE: Operating the equipment in the presence of
flammable gases or fumes CONSTITUTES A DEFINITE SAFETY HAZARD. For equipment designed
to operate in such environments the proper safety devices must be used such as dry air or inert gas
purge, intrinsic safe barriers and/or explosion-proof enclosures.
DO NOT USE IN ANY MANNER NOT SPECIFIED OR APPROVED BY THE MANUFACTURER:
Unapproved use may result in damage to the equipment or present an electrical shock or fire hazard.
MAINTENANCE and SERVICE
CLEANING: Keep surfaces clean and free from dust or other contaminants. Such contaminants can
have an adverse effect on system performance or result in electrical shock or fire. To clean use a
damp cloth. Let dry before use. Do not use detergent, alcohol or antistatic cleaner as these products
may have an adverse effect on system performance.
SERVICE: Do not attempt to repair or service the instrument yourself unless instructed by the factory to
do so. Opening or removing the covers may expose you to high voltages, charged capacitors, electric
shock and other hazards. If service or repair is required, contact the factory.
Model 4431T Shielded Bag Test System - Operating Manual 5 D00003 Rev. K.
1.0 INTRODUCTION
HISTORICAL BACKGROUND
The rapid advancement in the electronics industry during the past decade has placed increasing
importance on the understanding of electrostatics and its effect on electronic devices and systems.
Electrostatic Discharge (ESD) is a common cause of microelectronic circuit failure. Many of these
devices can be seriously damaged or destroyed by an electrostatic discharge below 30 Volts, or as a
result of an electrostatic field of only a few hundred Volts.
The static shielding bag was developed to provide a package that would protect static sensitive
components placed inside from external ESD events. Many different bag constructions are now
available that, when properly used, provide a Faraday cage (electrostatic field attenuation) around the
objects placed inside.
The most common bags are constructed from transparent polyethylene film with a metalized layer of
mylar laminated to either the outside or the inside of the bag. The metalized side is either on the
outside (metal out) or buried between the mylar and the polyethylene film (metal in or buried metal
layer). The metalized layer that provides the shield is usually aluminum or nickel with a thickness
limited to approximately 100 Angstroms to maintain bag transparency. Other constructions are
available, however, that consist of carbon grids or conductive fibers such as carbon or copper. Static
shielding is also provided by nontransparent bags that are either carbon loaded polyethylene or foil
laminated such as the MIL PRF 81705E Type 1 water vapor-proof shielded bag.
Various commercial and military specifications and test standards now exist for evaluating the different
electrical and physical characteristics of the bag and/or its material. The static dissipative
characteristics of the bag material is determined by measuring the surface resistance in accordance
with Electrostatic Discharge Association test standard ANSI/ESD S11.11. The antistatic (ability to resist
tribocharging) characteristic is determined using procedures outlined in ESD ADV 11.2.
The Electronics Industries Association Test Standard EIA 541-1988 "Packaging Material Standards For
The Protection Of ESD Sensitive Items" references test methods in place in 1988. However, ESD
Association test standards developed since then are now specified.
The shielding effectiveness of the bag was previously evaluated using the voltage differential test
method specified in EIA 541. However, the energy test method specified in ANSI/ESD S11.31
supersedes the voltage test and is now the specified test method. MIL PRF 81705E and
ANSI/ESD S11.4 specify the ANSI/ESD S11.31 test. The ETS Model 4431-T Shielded Bag Test
System meets the requirements of only the ANSI/ESD S11.31 test standards.
The following sections will focus on the energy test, per ANSI/ESD S11.31.
Model 4431T Shielded Bag Test System - Operating Manual 6 D00003 Rev. K.
2.0 EQUIPMENT DESCRIPTION
The ETS Model 4431-T ESD Test System is supplied with a laptop computer and an oscilloscope as
shown in Figure 3-1.
Figure 3-1: Model 4431-T Shielded Bag Test
System
This is a turnkey system that performs the ANSI/ESD S11.31 shielding bag tests. The 4431 Discharge
Unit provide the correct discharge current pulse for both tests. The capacitive sensor detects the current
pulse and sends the signal(s) to the included oscilloscope for detection and display. Oscilloscope
waveform information may be sent to the included computer for processing, display, and calculation of
energy.
The Model 4431-T Shielded Bag Test System consists of the following components:
3.1 The 4431 Discharge Unit
High voltage power supply, adjustable from approximately 850 to 1,250 Volts DC with 3½-digit
LED display, allows the user to make minor corrections to obtain the specified discharge current
and energy.
Universal switching power supply, may be operated directly from 90 – 260 VAC, 50/60 Hz line
voltage (mains) with 0.5A resettable fuse that is reset by powering down the unit, and after
several seconds turning it back on.
Separate ON/OFF switches on the front panel for overall power and high voltage. Note:
Discharge only occurs if high voltage is ON.
A green LED point source indicates CHARGE (HV is ready).
Model 4431T Shielded Bag Test System - Operating Manual 7 D00003 Rev. K.
A red LED point source illuminates during each DISCHARGE.
Function switch on the front panel used to select MANual or AUTO operation of nJ (Energy)
test per ANSI/ESD STM11.31.
Selection of discharge network: 100 pF/1.5KΩ only.
Lever actuated spring- loaded design provides easy insertion and removal of the sample. The
lever clamps the discharge electrode against the bag, capacitive sensor and spring loaded
ground electrode with approximately 5 pounds of force, ensuring consistent and repeatable
results.
Mercury wetted discharge relay
TEST button on the front panel provides manual initiation of the discharge pulse. Foot switch
connection provides hands free operation, duplicating the function of the TEST button.
Capacitive sensor - a floating arm consisting of upper and lower 0.875" diameter precision
ground stainless steel electrodes mounted in a 0.5" Acrylic base with nominal capacitance of 8
+2 pF, a CT-1 current transducer, and 500 Ohm resistor.
Discharge electrode grounding relay to remove residual charge between tests.
Adjustable bag insertion stops for configuring the System for different bag sizes per
specification.
3.2 Oscilloscope
Tektronix Model TDS2022C. 200 MHz, 2GS/s
3.3 Computer
Laptop computer running windows 10.
3.4 Software
ETS MODEL 4431 Test Manager Revision H.
3.5 Included Accessories
Included with the Model 4431-T are the interconnect cables and accessories shown in Figure 3-2:
Figure 3-2: Model 4431-T cables and accessories
6
3
7
1
4
5
2
Model 4431T Shielded Bag Test System - Operating Manual 8 D00003 Rev. K.
1. BNC cable from CT-1 to oscilloscope (Integral to Discharge Unit)
2. 50 Ohm terminator
3. USB-USB cable from computer to the oscilloscope (Model 4431-T only)
4. USB to serial converter with 9-pin sub-D from computer to communications cable (Model 4431-T
only) NOTE: Do not substitute
5. 9-pin sub-D from Converter to 25-pin sub-D to Model 4431-T
6. Foot switch
7. IEC Line Cord (North American plug)
Model 4431T Shielded Bag Test System - Operating Manual 9 D00003 Rev. K.
4.0 ENERGY TESTING - TEST METHODS
4.1 ANSI/ESD S11.31 ESD Association standard for evaluating the performance of electrostatic
discharge shielding materials - Bags
This test method evaluates the performance of electrostatic discharge shielding bags. The purpose of
this standard is to ensure that testing laboratories, using this test method to evaluate a given
packaging material, will obtain similar results.
This standard specifies the discharge waveform characteristics, probe configuration, probe
capacitance and bag size. Figure 4-1 shows the generic schematic of the test system configured for the
energy test.
Figure 4-1: System generic
schematic
Figure 4-2a shows the discharge current waveform requirement at the specified 1000 Volts when
measured with R2=0, a short to ground.
Figure 4-2a: Discharge waveform through short per ANSI/ESDA-JEDEC-JS-001
Model 4431T Shielded Bag Test System - Operating Manual 10 D00003 Rev. K.
Figure 4-2b: Discharge waveform through 500Ω per ANSI/ESDA-JEDEC-JS-001
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