User Manual - Electro Tech Systems
Contents
1. 1 00 Volts 1 CALIBRATION CAPACITOR 0 1Battery 2 each 9 Volt Alkaline Duracell MN1804 or equiv Battery Life 20 hours min continuous use 6 12 months est under normal use AC Power Module 90 260VAC 50 60Hz Optional OPERATING ENVIRONMENT 20 10 C 0 60 R H non condensing DIMENSIONS 7 5 Wx8 0 Dx1 75 H 191x203x45mm WEIGHT 2 Ibs 0 91kg FARADAY CONTAINERS Model 231 Cup 3 125 79mm Diameter Model 232 Pail 12 0 305mm Diameter Model 233 Bucket 24 x24 x22 610x610x559mm Model 234 Probe ACCESSORIES PART 230 5844 Foot operated READ ZERO switch PART 230 5845 90 260VAC 50 60Hz Optional PART 230 5847 0 01 amp 1 0 uF Test Capacitors PART 705 5848 Foot Operated Accessory ON OFF Switch for ionizer 4 09 7 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 Seller2. 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 Sellers 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 result from any cause whatsoever The warranty becomes null and void should the equipment or any part thereof be abused 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 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
3. The Model 234 Charge Detector Probe shown in Figure 2 0 4 is designed to measure charge on the surface of an object while it is being triboelectrically charged due to motion of another media flowing rubbing or separating from the test object Signal output Plug in Conical Tip Remote ZERO READ cable Figure 1 1 Model 234 Charge Detector Probe OPERATION Connect the Faraday cup or bucket to the BNC INPUT connector located on the front panel of the instrument as shown in Figure 3 0 1 If the remote READ ZERO switch and or a recording device are being used connect them to the respective output connectors located on the rear panel Figure 3 0 1 Faraday cup connections 3 1 Preliminary Checkout Turn the POWER switch to ON and the READ ZERO switch to ZERO Set the RANGE switch to 200nC Connect the 0 10 uF test capacitor supplied with the instrument to the ground jack located on the rear panel and touch the other terminal to the 1 0 Volt output jack located on the front panel Set the READ ZERO switch or depress the remote foot switch to READ and touch the charged capacitor to the inner can of the Faraday cup The DPM should indicate 100 2nC Place the cover on the Faraday cup or bucket With the RANGE switch set to the 20 nC position place the READ ZERO switch in the READ position and observe the DPM for one minute The reading should not exceed 0 05nC Return the switch setting to the ZERO position Thi
4. within 1 and be of the low leakage type Using the relationship Q nC C uF V Volts any calibration value can be obtained MAINTENANCE The Model 230 Nanocoulombmeter is designed with low current circuits that provide approximately 20 hours of continuous use from a pair of 9 Volt Alkaline Duracell Type MN 1604 or equivalent batteries When the battery voltage drains down to 12 Volts the front panel BAT LO LED illuminates The batteries should be replaced to retain measurement accuracy To change batteries remove the battery cover mounted on the rear panel The batteries are connected to the instrument by a pair of standard 9 Volt battery clips Both batteries should be replaced at the same time Replace the battery cover lf the instrument fails to operate properly it should be returned to ETS for repair and recalibration A Return Material Authorization RMA must be obtained from ETS prior to sending in the instrument The instrument should be packed in adequate packaging to avoid incurring any shipping damage SPECIFICATIONS READOUT 32 Digit LCD 12 characters RANGE 20 200 2000 nC full scale RESOLUTION 20 nC RANGE 0 01 nC 200 nC RANGE 0 1 nC 2000 nC RANGE 1 0 nC DRIFT lt 0 05 nC minute ACCURACY 2 0 full scale max 1 digit ZEROING Fully Auto Front Panel READ ZERO switch amp Remote SPST switch input RECORDER OUTPUT 0 1 99 Volts Source Impedance 1 Ohm max Standard BNC connector CALIBRATION OUTPUT
5. NANOCOULOMBMETER Model 230 ai rite l m i s F J L LI i a a Operating Manual 4 09 electro tech systems inc www electrotechsystems com 3101 Mt Carmel Avenue Glenside PA 19038 Tel 215 887 2196 Fax 215 887 0131 1 0 2 0 INTRODUCTION The evaluation of triboelectric charge generation is performed either by measuring the voltage build up on material after it has been separated from the same or different material or by measuring the amount of charge developed on the material When used with a suitable Faraday cup the charge on a wide range of material types and sizes can accurately be measured by the Model 230 Nanocoulombmeter The Model 230 is a complete instrument for measuring charge directly in nanocoulombs The instrument is available with either a 3 125 79mm diameter Faraday cup a 12 805mm diameter Faraday pail a 24 x24 x22 610x610x559mm Faraday Bucket a detector probe or it can be used alone to measure the charge on capacitors or from Capacitive discharge systems with adequate protection The Nanocoulombmeter has 3 user selectable ranges of 20 200 and 2000 nanocoulombs to cover a wide range of charge measurement applications The resolution of the 20 nC scale is 0 01 nC Drift is lt 0 05 nC minute The instrument incorporates a built in precision 1 0 Volt output along with a precision 0 10 uF 1 capacitor for checking system calibration The Model 230 meets
6. ables a remote switch to be used to place the instrument in the READ mode When the optional remote switch is plugged into this jack it parallels the READ ZERO switch on the front panel allowing either switch to control this function This feature makes operating the Model 230 very easy while making measurements in locations such as humidity controlled glove boxes A 0 1 99 Volt signal IS available at the Recorder Output corresponding to a O full scale reading of the RANGE selected Three different standard size Faraday cups buckets shown in Figures 2 0 3a b 8c are available Special Faraday cups or buckets can also be provided on special order The Model 231 3 125 79mm and the Model 232 12 805mm units consist of two round concentric aluminum containers assembled together with Teflon insulators between them The outer can is connected to ground and the inner can comprises the sensing input A cover is supplied to completely shield the inner can when making critical measurements in a high electrostatic field environment a Model 231 b Model 232 c Model 233 Figure 2 0 3 Standard Faraday cups buckets 3 0 The large 24 x24 x22 610x610x589mm Faraday Bucket Model 233 is a welded assembly that is fabricated from 0 093 aluminum This bucket is designed for evaluating large material samples or complete assemblies All Faraday cups and buckets are connected to the instrument by a 3 foot Teflon insulated cable
7. equipment must be packed in a sufficiently large box or boxes is 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 WOODEN CRATES MUST NOT BE USED PACKAGING OF DELICATE INSTRUMENTS IN WOODEN 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
8. ost applications recalibration should be performed on a yearly basis Contact ETS for recalibration service The user can check the calibration of the instrument at any time by using the supplied 0 10uf 1 polystyrene capacitor and a calibrated voltmeter having an input impedance greater than 1 MegOhm to verify the accuracy of the built in voltage source The capacitor when charged to 1 00 Volt will produce a reading on the DPM of 100 2nC This procedure provides a system check and is not a substitute for periodic laboratory calibration To check the calibration of the measurement set up connect the clip lead of the calibration check capacitor to the ground terminal on the rear panel or to the outer shell of the Faraday cup or bucket Select the 20nC RANGE Touch the lead from the capacitor to the CAL output connector on the front panel Place the READ ZERO switch in the READ mode and then touch the capacitor lead to the inner can or directly to the BNC input connector if a Faraday cup or bucket is not being used The DPM should read 100 2 nC 9 0 6 0 The other ranges can also be checked with the same capacitor if a precision voltage source is available 0 10 Volts applied to the capacitor will produce a reading of 10nC in the 20nC RANGE and 10 0 Volts applied to the capacitor will produce a reading of 1000nC in the 2000nC RANGE Additional points can also be checked by using different voltages and or capacitor values must be known to
9. s provides an initial checkout of the system performance To make a measurement first select the RANGE desired 20 200 or 2000nC Then place the READ ZERO switch in the READ position or activate the remote READ ZERO switch immediately prior to placing the charged object to be measured into the cup or bucket Allow approximately 2 seconds before taking a reading li the reading is very low measurable in the next lower range or is over scale 1 change the RANGE switch setting and repeat the measurement Each time a new measurement is taken the READ ZERO switch must first be placed in the ZERO position When using the ETS Foot Operated Remote READ ZERO Switch the system is normally in the ZERO mode When the foot switch is depressed the system goes into the READ mode and remains in that mode for as long as the switch is depressed When making a measurement it is extremely important that the operator minimize the generation of any electrostatic fields These fields can be detected and they will adversely affect the measurement Cable movement also may cause a triboelectric charge to be generated on the inner conductor of the shielded input cable and thus any cable movement should be avoided li the measurement cannot be performed without generating extraneous electrostatic fields the cover should be placed over the Faraday cup immediately after the charged object has been placed inside and then the reading taken The instrument can al
10. so be used to precisely determine the total Capacitance of an electronic network by charging the network with a given precise voltage and then discharging the network into the Nanocoulombmeter If voltages over 10 Volts are used then a 1 MegOhm resistor must be placed in series with the input Taking measurements using the Model 234 Detector Probe is covered in its respective Instruction Manual Otherwise damage to the instrument may occur The maximum voltage allowed for this type of measurement SHOULD NOT EXCEED 1000 Volts Using the relationship Q CV the desired Capacitance of the network C may be calculated by dividing the indicated charge Q by the known charging voltage V For example in a number of specifications such as Mil Std 263A and EIA 541 the capacitance of an ESD simulator discharge network is specified at a voltage of 1000 Volts To determine the Capacitance connect a 1 MegOhm resistor in series with the simulator output and the Model 230 input Set the charging voltage to precisely 1000 Volts then discharge the capacitor into the Nanocoulombmeter A reading of 100nC on the DPM will correspond to a capacitance of 100pF using the formula C Q V 100x10 1x10 100pF 4 0 CALIBRATION The Model 230 is calibrated at the factory using instrumentation traceable to N I S T Periodic recalibration of any measuring instrument is required if measurement accuracies and proper system performance are to be assured In m
11. the requirements for charge measurement as specified in applicable ESDA ASTM EIA DOD as well as many other industry standards EQUIPMENT DESCRIPTION The Model 230 shown in Figure 1 0 1 is powered by two 9 Volt alkaline batteries that are readily accessible from the rear of the instrument An optional AC Power module is available to operate the unit from 95 240VAC 50 60Hz A BAT LO indicator warns of low battery voltage 12 Volts The instrument is housed in a 7 5 L x 8 D x 1 75 H 191x203x45mm aluminum case that provides extra shielding from external fields nance NANOCOULOMBMETER 00 2000 READ CAL O INPUT a a e Wi e POWER BAT LO ZERO pa FA orr amp et a NANOCOULOMBS MODEL 230 e Figure 2 0 1 Model 230 Nanocoulombmeter front panel The front panel consists of a 312 digit LCD readout with 1 2 inch numerals a 3 position rotary RANGE selector switch a READ ZERO switch a 1 0 Volt CAL output BAT LO warning indicator POWER ON OFF switch and a standard BNC input signal connector The rear panel shown in Figure 2 0 2 consists of the battery compartment a ground GND terminal for referencing the instrument to ground as well as grounding the reference capacitor a remote READ ZERO output jack and a Recorder Output BNC connector Io O 32 REMOTE EXT PWR 2 0 V ZERO a MADE IN USA Figure 2 0 2 Model 230 Nanocoulombmeter rear panel The remote READ ZERO jack en
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