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MODEL 832 CLAMP ELECTRODES USER MANUAL

1. the 100 Volt resistance reading is within the specified limits Note A measured resistance may be unstable at 10 Volts but stable and within the specified limit at 100 Volts On the other hand the resistance may be below the measurement capability of the instrument at 100 Volts It is also possible the resistance is below the measurement capability of the instrument at 10 Volts In either case record that the measured resistance is less than the measurement capability of the instrument ex lt 10 Ohms The part would be considered acceptable If actual low resistance measurements are required then use appropriate instrumentation and test voltage to obtain the reading To measure volume resistance connect the resistance meter to both the BLACK and RED jacks of a single Clamp Electrode and clamp it to the part to be measured Follow the measurement procedure above To calculate volume resistively multiply the measured resistance by the area of the small contact divided by the thickness of the material in cm refer to Section 3 1 3 3 Static Dissipation This test measures the ability of a material or assembly to dissipate a charge using the measured resistance path 1 Prepare the samples to be tested in the same manner as for measuring resistance Verify the test set up by measuring the dissipation time for a 10 megohm 1 resistor Connect the desired contact electrode to the Charge Plate Monitor detector plate and the resist
2. DEN CRATES SUBSTANTIALLY INCREASES THE CONTENT S SUSCEPTIBILITY TO SHOCK DAMAGE DO NOT PLACE INSTRUMENTS OR ACCESSORIES INSIDE OTHER INSTRUMENTS OR CHAMBERS ELECTRO TECH SYSTEMS INC WILL NOT ASSUME RESPONSIBILITY FOR ADDITIONAL COST OF REPAIR DUE TO DAMAGE INCURRED DURING SHIPMENT AS A RESULT OF POOR PACKAGING
3. MODEL 832 CLAMP ELECTRODES USER MANUAL 1 0 GENERAL DESCRIPTION The Model 832 Clamp Electrode Assembly is designed to test tubes valves and other planar and non planar objects such as IC Shipping Tubes and automotive fuel line components and assemblies in accordance with current and proposed industry specifications requiring resistance and or static dissipation measurements The probes feature a unique dual pad design capable of measuring point to point point to ground volume resistance resistivity and static dissipation The Model 832 meets the electrode configuration specified for measuring the resistance of fuel line components and assemblies in accordance with SAE J1645 versions dated 9 03 or later The electrodes are designed to be used with resistance meters having test voltages of 10 and 100 volts such as the ETS Models 880 and 872 shown below or the Models 871 and 863 6487 When connected to the detector plate of a charged plate monitor such as the ETS Model 204 Charge Plated Analyzer the electrodes enable the user to measure dissipation time from 1kV to 100 volts in accordance with SAE J1645 Model 880 Model 872 2 0 ELECTRODE DESCRIPTION The Model 832 electrode assembly consists of one 25 square 6mm and one 25 x 125 6x3mm conductive elastomer pads with volume resistivity of 0 08 ohm cm and Shore A hardness of 65 durometer The pads are mounted to stainless 3 0 st
4. easurements Loaded thermoelectric material is generally not adversely affected by humidity as long as it is reasonable such as less than 75 R H Currently ESD materials are classified as follows Conductive Dissipative Insulative Surface Resistance lt 10 Q 10 to lt 10 Q gt 10 Q Volume Resistance same The above ranges are resistance in ohms Q not resistivity in ohms sq Q sq Materials with bulk resistance characteristics can also be classified by specifying its volume resistivity This is simply done by multiplying the measured resistance by the area of the measuring electrode or material surface whichever is smaller and divided by the thickness Pv A t Rm Q cm All values are in cm giving a volume resistivity in Ohms cm To convert to Ohms meter multiply by 100 Increasing or decreasing the thickness of the material will also change the actual resistance of the part with a specified volume resistivity This is a common technique used for ESD products to achieve a particular resistance It is the actual resistance of the part not its resistivity that determines how a part dissipates a static charge While volume resistance or resistivity is most appropriate to classify a bulk conductive material it is the measured resistance across or through the affected surface to ground that is used to determine the ability of material to dissipate a static charge While the resistance classifications were developed fo
5. eel electrodes that in turn are mounted to an insulated clamp exerting approximately 10 pounds 4 5kg of force The smaller electrode is designed to be inserted up to 1 25mm into a 25 6mm diameter tube such as those used in standard fuel system fittings and tubing or a 125 x 125 3x3mm slot When measuring surface resistance the 25 6mm square pad is typically used When measuring volume resistance both pads are used Volume resistively in Q cm if required is calculated using the area of the smaller pad 0 18 sq cm Standard 162 4mm banana jacks are located at the end of each handle The BLACK jack connects to the 25 sq 6mm electrode and the RED jack connects to the 25x 125 6x38mm electrode Red and Black cables 30 61cm long terminated with banana plugs are supplied with each pair of Electrodes Standard cables with banana plugs supplied with most resistance meters are also satisfactory for the resistance measurements NOTE For static dissipation measurements the supplied cables should be used because the higher insulation resistance of these cables will reduce secondary leakage paths USING THE ELECTRODES 3 1 Material Characteristics Loaded thermoformed plastics consist of plastic resin filler with very high resistance properties loaded with a small percentage of a conductive material such as stainless steel fibers carbon powder or fibers When molded these parts exhibit either cond
6. eg POM 2 23 Meg u s 420 Kilo 2 8 Gig 13 Meg POM 3 5 5 Meg u s lt 1 Meg 350 Kilo u s lt 10 Meg POM 4 680 Meg u s 7 4 Meg 2 5 Gig 60 Meg Notes Dissipation times are the fastest times each CPM can measure u s denotes an unstable resistance measurement Kilo 10 Meg 10 Gig 10 Terra 10 Rev 1 1 15 08 5 0 WARRANTY Electro Tech Systems Inc warrants its equipment accessories and parts of its manufacture to be and remain free from defects in material and workmanship for a period of one 1 year from date of invoice and will at the discretion of Seller either replace or repair without charge F O B Glenside similar equipment or similar part to replace any equipment or part of its manufacture which within the above stated time is proved to have been defective at the time it was sold All equipment claimed defective must be returned properly identified to the Seller or presented to one of its agents for inspection This warranty only applies to equipment operated in accordance with Seller s operating instructions Sellers warranty with respect to those parts of the equipment which are purchased from other manufacturers shall be subject only to that manufacturer s warranty The Seller s liability hereunder is expressly limited to repairing or replacing any parts of the equipment manufactured by the manufacturer and found to have been defective The Seller shall not be liable for damage resulting or claimed to re
7. et up by clamping the electrodes to a 1 kohm and a 10 Megohm 1 resistor and measure at both 10 and 100 Volts 3 For surface measurements both clamps are required Clamp both Clamp Electrodes on to the surface with the 25 sq 6mm contacts spaced apart at a desired distance on the surface to be measured If the area is too small then use the smaller contact For tubing place the 25 x 125 6x3mm contact inside the tube In all cases make sure the contact electrode sits flat and makes maximum surface contact with the part If the part has a metal ground strap take measurements at both the point on the plastic part where the ground strap is attached and at the point on the strap where the strap is connected to the ground point If using the 25 6mm contacts then connect the resistance meter to the BLACK jack on each Electrode If using the 125 6x38mm contacts connect the resistance meter to the RED jacks 4 lf the resistance meter being used allows manual selection of the test voltage select 10 Volts Apply the voltage for 5 seconds or until a consistent reading is obtained then take and record the reading If the reading is unstable record the reading as unstable Select 100 Volts Apply as above and record the reading The lower the measured resistance the smaller the differential between the 10 and 100 Volt readings should be In most cases a product is considered acceptable if either the 10 Volt or
8. or as shown in Figure 1 Connect the other electrode to ground such as the ground connection at the wall outlet If a battery powered CPM is used make sure it is also connected to ground Leave the grounding clamp unconnected Figure 1 Set the measurement parameters for a 1000 Volt charge NOTE The actual charging voltage is approximately 1100 1200 Volts or more but the decay time measurement starts when the voltage on the part reaches 1000 Volts and stops at the 10 100 Volt cut off Apply the charging voltage for approximately 2 seconds Release the Charge button and quickly connect the grounded electrode to the resistor Repeat the measurement 3 times Record the dissipation times All readings should be lt 0 20 seconds or the minimum capability of the CPM If the instrumentation includes a grounding relay module then connect the green wire to the wall outlet and plug the cable from the grounding electrode into the module and clamp the electrode to the other resistor lead Charge the system as above then depress the GROUND pushbutton and record the reading All readings should be lt 0 20 seconds NOTE Do not use the grounding function of the CPM to perform this test This function only grounds the detector plate Connect the electrodes to the assembly Place the assembly on a highly insulative surface gt 10 Ohms sq such as acrylic Teflon polycarbonate etc to ensure there is no secondary leakage path for the a
9. pplied charging voltage to bleed off Figure 2 4 Apply the charging voltage for approximately 2 seconds Immediately ground the assembly by clamping the grounded electrode to the desired point Repeat the measurement 3 times and record the results If the grounding module is utilized as shown in Figures 2 and 3 follow the same procedure described for system verification Figure 3 4 0 TEST RESULTS The above test procedures were used to measure the resistance of automotive fuel system components and assemblies and static dissipation of assemblies Two different test instruments were used for each procedure The results are as follows Part Resistance Ohms Dissipation Dr Thiedig Milli TO 2 ETS 872 EA3 ETS 204 10V 100V 10V 100V Sec Sec 10 Meg Resistor 1 0 Meg 9 96 Meg 9 9 Meg 1 0 Meg 0 13 0 5 Fuel Filter Assy Hose Hose L 5 0 Meg 1 6 Meg 4 7 Meg 2 0 Meg 0 13 0 5 Hose Gnd Pt 1 1 Meg lt 1 Meg 330 Kilo 180 Kilo 0 13 0 5 Hose Gnd Strap 2 2 Gig 8 1 Meg 1 9 Gig 25 Meg 0 13 0 5 Fuel Filter 140 Meg 22 Meg 23 Meg 3 5 Meg 0 13 0 5 Turn Electrodes 90 24 Kilo 120 Kilo Hose w Conn gt 1 Gig gt 1 Terra gt 1 Terra gt 1 Terra 10 Coated Tube gt 1 Gig gt 1 Terra gt 1 Terra gt 1 Terra Elbow Conn lt 1 Kilo lt 1 Meg 180 lt 10 Kilo Test Strips PPS 1 1 1 Kilo lt 1 Meg 2 2 Kilo lt 10 Kilo PPS 2 lt 1 Kilo lt 1 Meg 4 2 Kilo lt 10 Kilo PPS 3 lt 1 Kilo lt 1 Meg 8 0 Kilo lt 10 Kilo POM 1 1 4 Gig u s 1 1 Meg 310 Meg 13 M
10. r ESD packaging materials most specifications referencing resistance resistivity for materials 3 2 used in hazardous locations usually specify resistance limits that fall within the Conductive range Finally it should be noted that the resistance resistivity property of material does not predict whether the material will be low charging antistatic or not Measuring Resistance Prior to use the calibration of the test apparatus should be checked Plug the cables from the resistance meter into the BLACK banana jacks of the Model 832 Clamp the electrodes across a 1 kohm and a 10 megohm 1 resistors Measure the resistance using both 10 and 100 volts The resistors are not included with the clamp electrodes Whenever the electrostatic characteristics of materials are measured the temperature and relative humidity at the time of measurement should be recorded Many materials are humidity dependent Measurements taken at different RH levels may result in a significant variation in the measurements The following recommended test procedure was developed for testing automotive fuel system components and assemblies The same procedure can also be applied to just about any desired point point point ground and volume resistance measurement 1 Place the component or assembly being measured on a surface having a surface resistance at least two orders of magnitude higher than the upper resistance limit gt 1x10 Ohms 2 Verify the test s
11. sult from any cause whatsoever The warranty becomes null and void should the equipment or any part thereof be abused or modified by the customer or 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 for the purposes of the buyer or its or their performance either quantitatively or qualitatively or as to the products which it may produce and the buyer is expected to expressly waive rights to any warranty other than that stated herein ETS must be notified before any equipment is returned for repair ETS will issue an RMA Return Material Authorization number for return of equipment Equipment should be shipped prepaid and insured in the original packaging If the original packaging is not available the equipment must be packed in a sufficiently large box or boxes if applicable of double wall construction with substantial packing around all sides The RMA number description of the problem along with the contact name and telephone number must be included in formal paperwork and enclosed with the instrument Round trip freight and related charges are the owner s responsibility WARNING PACKAGING OF DELICATE INSTRUMENTS IN WOO
12. uctive or static dissipative properties as defined in the ESD Association ADV1 0 Glossary of Terms These materials have bulk resistance properties verses the surface only resistance properties found in other ESD materials When a voltage is applied either across or through the material the dielectric of the filler breaks down and current flows from particle to particle As the loading of the conductive medium decreases there is greater distance between particles that in turn requires a higher voltage to break down the increased dielectric At some point once a higher voltage is applied to establish continuity the resistance of the path created may become altered permanently Loaded thermoplastic materials are effective in reducing the upper resistance limit to approximately 10 Ohms Another characteristic associated with loaded thermoplastic materials that affects resistance measurements is the microscopic insulative layer that develops on the surface of the molded part The dielectric of this layer must be broken down before a resistance measurement can be made Once this occurs the actual resistance of the part may be lower than the measuring range of the instrumentation used In essence these materials are non linear and voltage dependent Hence different test voltages will give different results Even the series resistor incorporated in virtually all resistance meters are different from meter to meter which will cause variations in the m

MODEL 832 CLAMP ELECTRODES USER MANUAL

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