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5

The 3M

™

ScanEM-C Electromagnetic Near-Field Probes can:

Pinpoint the location of a component, circuit area or trace with high
emission levels

Predict radiated EMC test results

Pre-test your product prior to an official compliance test in order to
identify potential problems early

Quickly troubleshoot a product that has failed a compliance test

Find EM leakage on enclosures, cables and connectors

Find sources of EM interference

Show the presence of a high-frequency signal on a trace or wire
without contact

Help to troubleshoot circuits and wiring

Work as amplified near-field probes when connected to a
spectrum analyzer

Work as non-contact high-bandwidth voltage and current
oscilloscope probes

Work as field-strength probes when used with a multimeter

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Содержание ScanEM-C

Страница 1: ...3M ScanEM C ElectroMagnetic Near Field Probe Kit Model CTK015 User s Guide...

Страница 2: ...f not avoided could result in death or serious injury and or property damage CAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury and or prop...

Страница 3: ...nce and 2 this device must accept any interference received including interference that may cause undesired operation Note This equipment has been tested and found to comply with the limits for a Clas...

Страница 4: ...es for a spectrum analyzer 12 Non contact oscilloscope probes 13 Broadband field strength probe for a multimeter 15 ScanEM C as a probe 16 Analyzing the results 18 Troubleshooting 20 Common places to...

Страница 5: ...d Probe Kit model CTK019 ScanEM C Kit Contents The ScanEM C Kit model CTK015 consists of One ScanEM EC probe electric field model CTM030 One ScanEM HC probe magnetic field model CTM032 One Six foot 1...

Страница 6: ...Probes are completely self contained EM field detectors When connected to test equipment ScanEM C Probes become broadband amplified near field probes In a stand alone mode ScanEM C Probes indicate th...

Страница 7: ...y Quickly troubleshoot a product that has failed a compliance test Find EM leakage on enclosures cables and connectors Find sources of EM interference Show the presence of a high frequency signal on a...

Страница 8: ...esult The level dial is used to set the normal background level It also works as a squelch control The stronger the emission level the higher the pitch of the sound Five LEDs indicate relative field s...

Страница 9: ...ments with the ScanEM C Probe s antenna The test results may be meaningless and normal operation of the measured device may be influenced by parasitic capacitance introduced by the ScanEM C Probe in d...

Страница 10: ...ily differentiate which trace emits the most radiation by just rotating the ScanEM HC Probe around its longest axis see illustration below The ScanEM HC Probe will show the strongest readings when its...

Страница 11: ...roximity to the product Setting the Level Dial The Level dial sets the reference level for field strength measurements The sensitivity of the ScanEM C Probe stays the same regardless of the position o...

Страница 12: ...a probe only Use Level settings of one and above in stand alone operation Level Dial Numbers The numbers from zero to nine on the Level dial do not refer to any specific field strength nor do they si...

Страница 13: ...D just turned On Figure B is provided for reference only Specification is subject to change without notice Operation as a Probe 1400 1200 1000 800 600 400 200 0 Green Yel 1 Yel 2 Red 1 Red 2 LEDs m V...

Страница 14: ...g any influence on the output signal Do not load the ScanEM C Probe s output with less than 50 Ohms load such as connecting it in parallel to the inputs of a spectrum analyzer and 50 Ohms input of an...

Страница 15: ...counterpart at lower frequencies Avoid overloading the probes with a very strong field it may induce distortions in the ScanEM C Probe amplifiers The ScanEM EC Probe for example begins to overload at...

Страница 16: ...their bandwidth Probes have 60 100 or 250 MHz bandwidth Cost for higher frequency probes is prohibitively high With today s high speed circuits low bandwidth tools may easily miss nanosecond long tran...

Страница 17: ...set to Volts DC typical scale of 2 V You will need a BNC to banana plug adapter Set the Level dial to zero left most position In the absence of the electromagnetic field the multimeter should show 0V...

Страница 18: ...g the field strength on both sides of the shield also helps to evaluate shielding The ScanEM C Probes and a multimeter can be used to check the quality of applied shielding and gaskets in production A...

Страница 19: ...uits crystals or high impedance circuits anywhere where direct contact with the circuit disrupts its normal operation Locating Bad Connections The ScanEM C Probe can help in locating bad connections a...

Страница 20: ...places where high frequency signals are not normally expected i e AC power lines This happens because high frequency signals produced elsewhere ride on these lines and generate an electromagnetic fie...

Страница 21: ...n the early stages of development where it is not yet clear what frequency will be of concern the 3M ScanEM C Electromagnetic Near Field Probe will prove to be quick and effective In some cases the Sc...

Страница 22: ...ts as an antenna Pay special attention to how the EM signals get to the cable During the Design Phase This is the time to ensure agency compliance for your product at the lowest cost and with minimum...

Страница 23: ...above Make sure that you identify the hot spots Prepare remedies to take with you to the compliance lab i e shielding materials in case your product has trouble passing Don t forget to take your 3M S...

Страница 24: ...h many cases of conducted emission where the cable infected with the conducted radiation becomes an antenna and in turn produces radiated emission Near Field Primer The measurements done for agency ap...

Страница 25: ...iance test do not help in locating the source of a problem should one exist Near field measurements are the only way to pinpoint sources of offensive radiation But how good and reliable are these test...

Страница 26: ...of interest to those engineers used to precision in measurements The answer is simple a near field test regardless of the test equipment used provides only relative results The near field test can sho...

Страница 27: ...atteries as needed Keep ScanEM C Probes in the protective case when not in use Changing Batteries ScanEM C Probes come with the batteries installed Normally they should last several months Each ScanEM...

Страница 28: ...SMB connector on the back of the unit Do not take the nut completely off Holding both halves of the ScanEM C Probe as a single piece flip it over face up Gently remove the top half of the enclosure C...

Страница 29: ...mission level may be too high the ScanEM C Probe could be confused if high level emissions are coming from the sides and you are trying to locate a lower level emission spot in the middle Try to incre...

Страница 30: ...ed Operate button is pressed continuously while you are conducting your test Rotate the Level dial until the lights come on Check the batteries follow instructions for replacement The ScanEM C Probe p...

Страница 31: ...uestion as close as possible without touching Look and listen for any changes The higher the pitch of the sound and the more LEDs that are on the greater the strength of the electromagnetic field Ampl...

Страница 32: ...m 20 dB mA AC Load min 50 Ohms 50 Ohms AC Output Range into 50 Ohms load 0 1 Vp p 0 1 Vp p AC Output Resistance 60 kOhms 60 kOhms AC Output Range 1MOhm load 0 2 V max 0 2 V max Indication 5 LED color...

Страница 33: ...31...

Страница 34: ...nt any product is proven not to conform with 3M s Regulatory Information Sheet then 3M s entire liability and buyer s exclusive remedy will be at 3M s option either i replacement of product with a con...

Страница 35: ...s in resistors Plating in resistors Connector Transistor Inductor EMI filter Solder in instrument IC Solder in IC SJ T11363 2006 Indicates that this hazardous substance contained in all of the homogen...

Страница 36: ...contrary statements contained on your purchase order shall have no force or effect unless expressly agreed upon in writing by an authorized officer of 3M Warranty Limited Remedy Limited Liability This...

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