ETS 4431-EV User manual

SHIELDED BAG TEST SYSTEM
Model 4431-EV (Voltage & Energy)
&
Model 4431-V (Voltage Only)
(These models replace Model 431)
Operating Manual
10/10

1
IMPORTANT
SAFETY INSTRUCTIONS
(Equipment containing HV)
The equipment described in this Manual is designed and manufactured to operate within
defined design limits. Any misuse may result in electric shock or fire. To prevent the
equipment from being damaged, 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 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
Equipment designed to simulate a high voltage electrostatic discharge such as the Series
900 ESD Simulators and the Model 4046 Static Decay Meter utilize voltages up to 30kV.
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
equipment can be as high as 2kV.In addition, equipment may contain capacitors up
to 200pF charged to 1kV. 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.

2
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.
DO NOT OPERATE IN HIGH HUMIDITY: Operating the equipment in high humidity
conditions will cause deteriation 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 deteriation 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.
DONOT 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 affect 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 affect 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.

3
1.0 INTRODUCTION
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 81705D Type I water vapor-proof
shielded bag.
In selecting the correct bag for a given application, consideration must be given to
whether the product being sensitive. The ability of the bag not to charge the object
inside and the ability of the bag to dissipate any charge on its surface in a timely
manner when grounded must also be taken into account.
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 is accordance with Electrostatic Discharge
Association test standard ANSI/ESD STM11.11. The antistatic (ability to resist
tribocharging) characteristic is determined using procedures outlined in ESD ADV
11.21. The Electronics Industries Association Test Standard EIA 541-1988 "Packaging
Material Standards - For The Protection Of ESD Sensitive Items" currently references
similar test methods. However, ESD Association test standards 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 STM11.31 is now the preferred method. MIL PRF 81705D
specifies the ANSI/ESD STM11.31 test. The ETS Model 4431-EV Shielded Bag Test
System meets the requirements of both test standards while the Model 4431-V
performs only the EIA 541 Voltage Differential Test. The Model 4431-EV replaces
the Model 431. Any reference in this manual that refers to the Model 431 also applies
to the Model 4431 or EV or V, unless otherwise noted.

4
2.0 TEST METHODS
2.1 ANSI/ESD STM11.31-2006 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 2.0-1 shows the generic
schematic of the test system.
Figure 2.0-1: System generic schematic
Figure 2.0-2 shows the discharge current waveform requirement at the specified
1000 Volts when measured through a 500 Ohm resistor.
Figure 2.0-2: Discharge waveforms per ANSI/ESD STM5.1
The current pulse detected between the upper and lower electrodes of the
capacitive probe is used to calculate the energy inside the bag by integrating the
area under the curve as shown in Figure 2.0-3.

5
Figure 2.0-3: Typical Model 4431 shielded bag waveform
Six specimens of a given sample are required. Six measurements per specimen
is specified. Testing is to be performed at both 12% and 50% ±3% RH at a
temperature of 73 ±3°F after a conditioning period of 48 hours minimum. Bag
size for this test should be 8x10 inches (20x25 cm).
ANSI/ESD STM11.31 specifies that the test conditions, peak current, minimum,
maximum and average energy levels of all 36 measurements be reported for
bag qualification.
2.2 EIA 541-1988 Packaging Material Standards for ESD Sensitive
Items
EIA 541-1988 - APPENDIX E describes the voltage differential test method for
evaluating the relative performance of static shielding bags. Unlike ANSI/ESD
STM11.31, this standard does not define the discharge waveform, capacitive
sensor capacitance or bag size. The standard references a R/C network of 400
kOhms and 200pF, but standard industry practice is to use 1500 Ohms and
200pF.
This test measures the voltage differential between the upper and lower
electrodes of the capacitive sensor. When the 1000 Volt discharge pulse is
applied to the outside of a non-shielding bag, such as plain polyethylene, a pulse
is induced on the upper electrode and a much smaller pulse is induced on the
lower electrode. On the other hand, when the same pulse is applied to a known
good shielding bag, such as aluminum foil sandwiched between two poly bags, a
smaller voltage is induced on the upper electrode, travels around the bag and
induces an even smaller voltage on the lower electrode. These two reference
tests typically result in voltage differentials of approximately 600 and 5 Volts
respectively as shown in Figure 2.0-4.

6
Figure 2.0-4: Voltage waveform for non-shielding and shielded bags
A good static shielding bag typically will have a voltage differential of 5 to 30 Volts.
Bags with voltage differentials above 150 Volts usually have a surface resistance
above the specified 1x103Ohms upper limit. The voltage differential created by a
static shielding bag is primarily caused by the time delay for the applied pulse to be
induced on the lower electrode created by the resistance and capacitance of the test
bag. Hence, only bags of the same size should be compared. Very large bags (those
over 14 inches) have large capacitance that overwhelms the system, resulting in no
measurable difference between good and poor shielding bags.
3.0 EQUIPMENT CONFIGURATIONS
3.1 Model 4431-EV
The ETS Model 4431-EV Shielded Bag Test System is available with either a
desktop or laptop computer as shown in Figures 3.0-1a and b.
Figure 3.0-1a: Model 4431-EV Shielded Bag Test System, desktop computer

7
Figure 3.0-1b: Model 4431-EV Shielded Bag Test System, laptop computer
This is a turn-key system that performs both the ANSI/ESD STM11.31 and the
EIA 541-1998 shielding bag tests. Depending on the test method selected the
System provides the correct discharge current pulse for both the ANSI/ESD
STM11.31 and EIA 541 tests. The capacitive sensor detects the current pulse or
the voltage differential and sends the signal(s) to the included oscilloscope for
detection and from the oscilloscope to the included computer for processing and
calculation of energy; or attenuated voltage pulses from the direct connection to
the 2-channel oscilloscope for the EIA 541 test.
The Model 4431-EV Shielded Bag Test System consists of the following
components:
3.1.1 Discharge Unit
1. High voltage power supply with separate ON/OFF switch, adjustable
from approximately 750-1,250 Volts with 3½-digit LED display
2. Switched 100 & 200 pF and 1.5 and 400kOhm discharge networks
3. Mercury wetted discharge relay
4. Floating, programmable capacitive sensor consisting of two 0.875"
diameter precision ground stainless steel electrodes mounted in a
0.625" Delrin base with nominal capacitance of 6 pF
5. Built-in Tektronix CT-1 Current Transducer
6. 100:1 Voltage Attenuators for voltage differential test
7. Lever actuated stainless steel discharge and spring loaded ground
electrodes
8. Discharge electrode grounding relay to remove residual charge
between tests

8
9. Adjustable bag insertion stops for configuring the System for different
bag sizes per specification.
10. Calibration jumpers and cables
1.1.2 Oscilloscope
1. Tektronix Model TDS2022B
3.1.2 Computer (Desktop or Laptop)
1. Running Windows2000/XP/VISTA/7
3.1.3 Software
1. ETS Test Suit Manager, Energy Calculation Program (Version 4.0.3.3)
3.2. Model 4431-V
The Model 4431-V Discharge Unit is identical to the Model 4431-EV except it
does not include the CT-1 Current Transducer. The Tektronix Model 2022B
oscilloscope may be purchased from ETS or any oscilloscope having a
bandwidth of at least 50 MHz and a sampling rate 1 GS/s may be used to
perform the EIA 541 voltage differential test.
4.0 Discharge Unit Description
The Capacitive Sensor is a floating arm that contains the upper and lower electrodes,
CT-1 current transducer and 500 Ohm resistor. Programming jacks located on both
sides of the sensor arm allows the user to program the System for current or voltage
measurements by inserting the pair of jumpers into the respective pair of .040 pin jacks
as shown in Figure 4.0-1a and b.
a. Energy b. Voltage Differential
Figure 4.0-1: Capacitive sensor programming jumpers
The adjustable power supply allows the user to make minor corrections to obtain the
specified discharge current and energy. A 3½-digit LED readout displays the discharge
voltage. A switch on the front panel enables the user to turn off the high voltage when
not in use. Multicolored LED point sources indicate CHARGE and DISCHARGE.
The FUNCTION switch is used to select MANual operation of 'V, (Voltage differential
per EIA 541 using either 400 or 1.5 kOhms) and nJ (Energy per ANSI/ESD STM11.31);
or AUTO nJ. In the MAN mode the discharge pulse is initiated by either a front panel or
Pro
g
rammin
g
Jum
p
ers

9
a foot operated switch, which is convenient when testing in a humidity chamber. In the
AUTO mode, the discharge sequence specified in ANSI/ESD STM11.31 along with the
scope settings are controlled automatically by the ETS Energy Calculation Program.
The discharge waveform generated by the Model 4431 meets the requirements of
ANSI/ESD STM5.1 Electrostatic Discharge Testing - Human Body Model. A typical
discharge waveform measured with the discharge electrode in direct contact with the
capacitive sensor is shown in Figure 4.0-2.
Figure 4.0-2: Discharge waveform
A spring-loaded 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.
Included with the Model 4431EV are the following interconnect cables and accessories
shown in Figure 4.0-3a:
Figure 4.0-3a: Model 4431-EV cables and accessories
1. BNC-BNC (2) cables for connecting voltage output signals to oscilloscope
2. BNC cable from CT-1 to oscilloscope (Model 4431-EV only)
3. 50 Ohm terminator
4. USB cable from computer to the oscilloscope (Model 4431-EV only)
4
7
3
5
8
6
1
2

10
5. USB to serial converter with 9-pin sub-D from computer to communications
cable (Model 4431-EV only) NOTE: Do not sustitute
6. 9-pin sub-D from Converter to 25-pin sub-D to Model 4431-EV
7. Foot switch
8. IEC Line Cord (North American plug)
Figure 4.0-3b shows the jumpers and cables required to perform first time set up.
Figure 4.0-3b: Calibration cables and jumpers for first time set up
NOTE: If the Model 4431 is used to replace a Model 431 discharge unit an adapter is
required to convert the 25-pin COMM PORT to a 3-pin DIN to receive its command
signals from the computer’s PRINTER Parallel Port (Contact ETS). If the computer has
only one output, it is necessary to install an A/B switch (supplied with early versions of
the ETS Energy Calculation Program) to operate a printer.
The Model 4431 utilizes a universal switching power supply and 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.
The latest version of the ETS Energy Calculation Program is written for PCs running
Windows£2000/XP/VISTA/7. This program controls the Model 4431-EV, the Tektronix
TDS2022B oscilloscope used to capture the waveform and the computer to generate a
report containing all the data specified in ANSI/ESD STM11.31 plus the verification and
test data waveforms as shown in Figures 4.0-3 & 4.
5.0 SET-UP
Plug the AC line cord of the Model 4431 into a grounded outlet. This is a standard IEC
cord with North American grounded plug. For non-North American locations, a line cord
having the correct mains plug can be obtained from a local computer or electronics
store. Otherwise, cut off the plug and install the appropriate plug for the location.
5.1 ANSI/ESD STM11.31 Testing (Energy)
Refer to Figure 5.0-1 for the System set-up described below:
Cable to verify
discharge
waveform with
external CT-1
Shorting strap to
connect Dischg and
Capacitive
electrodes together
to measure 1kV
Dischg wavefor
m

11
Figure 5.0-1: System set up for Energy test
1. Connect the BNC connector from the built-in CT-1 current transducer into
CH-1 of the oscilloscope. The Terminator provided must be used in order
to match the 50 Ohm output impedance of the CT-1 to the 1 MegOhm
impedance of the scope.
2. Connect the 25 pin – 9-pin cable to the USB – 9-pin adapter and 25-pin sub-
D connector on the rear of the Model 4431-EV
3. Connect the USB - USB cable to the 1st computer USB port and the other
end to the USB-9-pin sub-D adapter.
2. Connect the USB – USB cable from the oscilloscope to the 2nd USB port on
the computer
3. If a printer is used connect it to the 3rd USB port on the computer
4. Confirm that the red jumpers located on the sides of the capacitive sensor
are plugged in the center and front .040 pin jacks. This programs the
capacitive sensor for current measurements.
5. Plug the phono plug from Foot Switch, if used, into the REMOTE
DISCHARGE jack on the rear panel of the Model 4431
6. Power up all instruments
7. Set the FUNCTION select switch to MAN nJ if the test is to be controlled by
the operator or to AUTO nJ if the test is to be controlled by the computer
8. For waveform verification in the MAN mode, set the oscilloscope VERTICAL
sensitivity to 500mV, the time base to 100nsec and the trigger level to
500mV. For bag testing start with settings of 20 or 50mV, 20nsec and 50 or
75mV respectively. Otherwise, the ETS Energy Calculation Program
automatically sets the correct scope parameters.
5.2 EIA 541 (Voltage Differential)
Refer to Figure 5.0-2 for the set up for the voltage differential test.

12
Figure 5.0-2: Voltage differential test set up
If the Model 4431-EV is used to measure voltage differential, the CT-1 current
sensor must be disconnected and the Voltage cables connected to perform this
test. The Model 4431-EV is shipped from the factory with the capacitive sensor
programmed for the Energy test. To convert the System from energy to voltage
differential, the capacitive sensor must first be converted by plugging the red
jumpers into the center and rear pins as shown in Figure 5.0-3.
Figure: 5.0-3 Capacitive Sensor conversion from energy to voltage
The Model 4431-V is shipped configured to the EIA 541 Voltage Differential test.
The capacitive sensor is configured for only the voltage differential
measurement.
5.2.1 R/C Networks
The user can select either of two R/C networks using the front panel
FUNCTION selector switch. The commonly used 200pF discharged
through 1500 Ohms or the EIA 541 specified 200pF discharged through
400 kOhms.
NOTE: The 1500 Ohm resistor will enable bags having surface
resistances between 10 and 100 kOhms (100 and 10,000 Ohms/sq) to be
differentiated. On the other hand, the 400 kOhm resistor will only be able
to differentiate bags having surface resistances between 1000 ohms and

13
1 Megohm (10,000 and 10 MegOhms/sq). Current industry practice is to
use 1500 Ohms.
5.2.2 Oscilloscope
The oscilloscope and Discharge Unit must first be calibrated as a set. If
the oscilloscope is supplied as part of the system, the Discharge Unit and
scope will have already been calibrated. If the scope is provided by the
user, it is first necessary to compensate the built in 100:1 attenuators and
cables to the scope input using the following procedure:
Place the shorting strap over the capacitive sensor to short the upper and
lower electrodes together. The tape side contacts the DISCHARGE and
GROUND electrodes. Using the clamping lever, secure the assembly as
shown in Figure 5.0-3. Connect the lead from the shorting strap to the
scope calibration pulse output. This will inject a signal into both channels
simultaneously. Set the vertical sensitivity of the scope to 5mV/Div, time
base to 250 Psec/Div and trigger to AUTO.
Connect one end of a BNC cable to the CH-1 BNC connector on the rear
panel of the Model 4431 and the other end to CH-1 of the oscilloscope.
Connect the other BNC cable to CH-2 of the Model 4431 and CH-2 of the
scope. Make sure the scope input impedance selector, if so
equipped, is set to 1 Megohm.
Figure 5.0-3: Voltage calibration Test Set up
Select CH-1. The square wave measured should look like that shown in
Figure 5.0-4a. If the waveform looks like the ones shown in Figure 5.0-4b
or c then, using a small blade flat screwdriver adjust the CH-1 “C” control
on the rear of the Model 4431 until the proper waveform is obtained.
CAUTION: The variable C control is very fragile. Do not try to force it
in either direction.

14
a. Ideal b. Overcompensated c. Undercompensated
Figure 5.0-4: Measured waveforms
Repeat the above for CH-2.
The amplitude of each signal must be the same. If not, adjust the CH-1
and/or 2 “R” controls to obtain equal signals.
After calibrating each channel individually, invert the CH-2 scope input
and select ADD. The composite waveform should look like that shown in
Figure 5.0-5c. Slight “R” and “C” adjustments may be required to obtain
the best straight line.
a. Unequal amplitude b. Incorrect compensation c. Optimum differential
Figure 5.0-5: Compensated waveforms
5.3 Testing EIA 541 Voltage Differential
1. Power up all instruments. Allow at least 15 minutes to warm up.
2. The following initial oscilloscope settings should be used. Follow the
manufacturer's instructions to implement.
a. For normal bag testing, set the scope VERTICAL sensitivities of CH-1
and CH-2 to 50mV. This is equivalent to 50 Volts (100:1 attenuation).
NOTE: The oscilloscope must have a nominal input impedance of 1
Megohm and 10-20 pF.
b. Set the time base to 1, 2 or 2.5 Psec.
c. Set CH-2 to INVERT and ADD. This subtracts the lower electrode signal
from the upper electrode signal and results in a single pulse that
represents the actual voltage differential displayed. NOTE: The signal
levels of CH-1 and/or CH-2 may exceed the dynamic range of the scope
sensitivity level selected. If this occurs the input amplifier will saturate,

15
especially if a digital storage oscilloscope is used, causing significant
measurement error. This condition normally occurs when buried metal
layer bags are tested and 5, 10 or 20 Volt sensitivity levels are selected to
obtain greater voltage differential resolution. To verify the signals, switch
out of the ADD mode and into the CHOP mode and observe the individual
CH-1 and CH-2 signals.
d. Set the trigger to NORM and CH-1 trigger source. Adjust the level for
consistent triggering.
6.0 OPERATION
6.1 Discharge Waveform Verification
6.1.1 ANSI/ESD STM11.31 Energy
ANSI/ESD STM11.31 defines the discharge waveform, but EIA 541 does
not, however, both tests utilize a similar discharge pulse. Therefore,
following the ANSI/ESD STM11.31 verification procedure will also apply
to EIA 541 testing. However, since the Model 4431-AV does not
include the CT-1 this measurement must be performed externally.
ANSI/ESD STM11.31 requires verification of the discharge current pulse
both through a short to ground and through a 500 Ohm resistor. This
requirement is based on an assembled apparatus where the Discharge
Simulator and the electrode assemblies are separate components. The
Model 4431-EV is an integrated system where the discharge waveform at
the discharge electrode is designed to meet the specified requirement.
Prior to each test in the AUTO mode the waveform, energy and peak
current is automatically verified. For verification testing before each test
series, measurement of the waveform with the capacitive sensor through
the CT-1 and the 500 Ohm resistor is required. This measurement is
performed by simply discharging directly to the capacitive sensor without
a sample in place. This waveform is shown in Figure 6.0-1 and should
measure between 420 and 500 milliamps and have an energy of 50,000
r3,000 nanoJoules at a 1,000 Volt discharge.
To measure the actual discharge waveform from the discharge output
without the 500 Ohm resistor and capacitive sensor a separate CT-1
current transducer is required. Place the Calibration Wire supplied
between the discharge electrode and capacitive sensor upper electrode
with the white insulator against the upper electrode. Lock in place using
the lever. Feed the bare end through the CT-1. Insert the wire into the
ground point as shown in Figure 6.0-1. The Discharge waveform per
ANSI/ESD STM 5.1 can now be measured.

16
Insulator
CT-1
18 gage wire
Figure 6.0-1: Calibration set up to measure ESD pulse
6.1.2 EIA 541-1988 Voltage Differential
EIA 541 does not specify the discharge waveform characteristics.
However, it is implied that the waveform meets the requirements of
ANSI/ESD STM 5.1. To verify the discharge waveform of the Model 4431-
V, follow the procedure described in paragraph 4 in Section 5.1.1 above.
6.2 Product Testing per ANSI/ESD STM11.31
ANSI/ESD STM11.31 specifies an 8" x 10" bag size with the capacitive sensor
placed in the center. The Model 4431 incorporates adjustable stops to correctly
locate 4", 6", 8" and 10" bag lengths. For the standard size bag insert the two
red plastic stops into the third hole from the front of the unit.
Insert a test bag by sliding it over the capacitive sensor until it hits the stops.
Center the bag latterly as shown in Figure 6.0-2. Be sure the sensor is inside the
bag.
Figure 6.0-2: Test bag location
If testing manually, set the FUNCTION switch to MAN nJ.
Adjust the DPM for a reading of 1000 ±10 Volts.

17
Set the oscilloscope vertical sensitivity to 50mV/div, time base to 50nsec/div and
trigger level to 50mV. Trigger mode is NORMAL.
Turn on the HV.
Initiate a discharge, using either the front panel TEST switch or the foot switch.
The discharge pulse will activate for approximately 250 milliseconds. The current
pulse detected by the capacitive sensor will be displayed on the oscilloscope.
Typical waveforms for a static shielding bag are shown in Figure 6.0-3.
Figure 6.0-3 Typical verification and shielded bag waveforms
Transfer the data from the oscilloscope to the computer in accordance with the
computer program protocol. The ETS Energy Calculation Program enables the
entire test sequence to be controlled by the computer. Set the FUNCTION
switch to AUTO nJ. Follow the computer program protocol (refer to the ECP
Operating Manual) to first activate the waveform verification test and then the
measurement sequence required for the first specimen. Repeat the procedure
for the remaining specimens. At the conclusion of the test, the computer will print
out the peak current; min, max and average energy level; and the standard
deviation plus all other information per specification. Figure 6.0-4 is a sample of
the ECP printout.

18
Figure: 6.0-4: Energy Calculation Report
6.3 Product Testing per EIA 541
EIA 541 does not require discharge pulse verification and does not specify a
specific bag size, but only requires that the capacitive sensor be placed 2" (5
cm) in from the open end of the bag and centered latterly. Therefore, the red
plastic adjustable stops should be inserted in the first set of holes for all testing.
As with the energy test, when the bag size increases, its capacitance also

19
increases. When the bag size reaches approximately 14" the bag and system
capacitance overwhelms the discharge capacitance resulting in no detectable
difference between good and poor shielding material.
1. Set the FUNCTION select switch to MAN 'V 400k or MAN 'V 1.5k
2. Set the oscilloscope vertical sensitivity of both CH-1 and CH-2 to 50V/div, time
base to 20Psec and trigger level to 50V. Trigger mode should be set to CH-1
NORMAL. Invert CH-2. Both channels zero line should be superimposed on
the center line. (The trigger mode must first be set to AUTO to align the traces
then return to NORMAL.)
3. Turn on the HV
4. Initiate a discharge by either depressing the DISCHG switch on the front panel
or by activating the foot switch. 'V testing can only be performed in the
Manual mode. Observe the waveform. It should look similar to that shown in
Figure 6.0-5. If the signal is off scale change the vertical sensitivity of both
channels and repeat the measurement.
Figure 6.0-5: Differential voltage set up waveform
5. Set the oscilloscope to MATH. Initiate a discharge. The differential pulse
detected by the capacitive sensor will be displayed on the scope along with
the actual differential voltage value. 'V of less than 30 Volts is required for
MIL PRF 81705D material and is generally the level accepted by industry for
good performing shielding material.
6.0 SOFTWARE
The ETS Test Suite Manager is preloaded in the supplied computer (desktop or
laptop). However, the software is also provided on disc with the System. The supplied
computer does not require a password. If a password is desired, install using standard
computer password installation methods.
Make sure all cables are installed before opening the program.