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ETS 4431-EV, Operating Manual

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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 20

P

sec 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. 

Summary of Contents for 4431-EV

Page 1: ...SHIELDED BAG TEST SYSTEM Model 4431 EV Voltage Energy Model 4431 V Voltage Only These models replace Model 431 Operating Manual 10 10 ...

Page 2: ...ating 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 Equip...

Page 3: ... 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 SE...

Page 4: ...IL 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 specificat...

Page 5: ... 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...

Page 6: ...rd 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 su...

Page 7: ...or 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 S...

Page 8: ...o 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 3 digit LED display 2 Switched 100 200 pF and 1 5 and 400kOhm discharge networks 3 Mercury wetted discharge relay 4 Floating programmable capa...

Page 9: ...nd 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 adjustabl...

Page 10: ... 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 Figur...

Page 11: ...age 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 spec...

Page 12: ...pers 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 ...

Page 13: ... 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 sp...

Page 14: ...ng 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 a...

Page 15: ...tial 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...

Page 16: ...s 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 wave...

Page 17: ... 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 Cen...

Page 18: ...aveforms 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 seque...

Page 19: ...d 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 ...

Page 20: ...formed 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 w...

Page 21: ...arges are correct If not click No and rerun the test sequence on the bag 10 To generate a report click on Reports then enter the Ref 11 Archived reports can be brought up by entering the respective Ref 6 2 Removing ETS Logo at Bottom of Report To remove the ETS logo at the bottom of the report proceed as follows 1 Close the program file 2 Go to Programs in the computer program file 3 Select ETS 4 ...

Page 22: ...or modified by the customer of if used in any application other than that for which it was intended This warranty to replace or repair is the only warranty either expressed or implied or provided by law and is in lieu of all other warranties and the Seller denies any other promise guarantee or warranty with respect to the equipment or accessories and in particular as to its or their suitability fo...

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