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Summary of Contents for 3M ScanEM-C
- Page 1 ScanEM-C ™ ElectroMagnetic Near-Field Probe Kit Model CTK015 User’s Guide...
- Page 2 ™ Field Probe Kit, Model CTK015 Read, understand, and follow all safety information contained in these user instructions prior to use of the 3M ScanEM-C Electro-Magnetic Near- Field Probe Kit, Model CTK015. Retain these user instructions for future reference. Explanation of Signal Word Consequences...
- Page 3 CAUTION To reduce the risks associated with environmental contamination related injury, which, if not avoided may result in minor or moderate injury: • Dispose of the probes in accordance with local, state, and federal regulations NOTICE: To reduce the risks associated with property damage: •...
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Page 4: Table Of Contents
Should things go wrong ...................22 Seeking help ......................22 EMC101 ......................23 Why EMC? .......................23 Near-field primer .....................23 The validity of the near-field measurements ............24 Taking care of your ScanEM-C probes ............26 Changing batteries ....................26 What if: ........................26 Specifications ....................30 Quick Guide ....................31... - Page 5 ™ improve your EM compliance process and will be a valuable addition to your bench and field tool collection. Î The ScanEM-C Kit is designed for board-level EMC pre-compliance and diagnostics. For EMC product-level diagnostics, use the 3M ScanEM-QC ™...
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Page 6: Product Description
ScanEM-C Probe doesn’t provide absolute levels. It serves only to single out the areas with relatively high emissions. As a probe, the ScanEM-C Probe provides both AC and DC outputs. ScanEM-C Probes serve as: broadband amplified probes for a spectrum analyzer;... - Page 7 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 ‰...
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Page 8: Scanem-C Electromagnetic Near-Field Probe Kit Controls And Connector
ScanEM Probe. ScanEM-C is “ON” as long Two AAA alkaline batteries are already installed in as this button is each ScanEM-C Probe. See page 26 for instructions held down. on how to replace the batteries. -
Page 9: Basics Of Operation
Both ScanEM-C Probes come with the batteries installed and are ready to work right out of the box. The best way to hold the ScanEM-C Probe is in the palm of your right hand, just as you would hold a pen, with your thumb on the red Operate button and with your index finger above the Level dial and Sound On switch (see illustration on page 6). -
Page 10: Stand-Alone Operation
ScanEM-HC Probe will show the strongest readings when its coil is parallel to the offending wire. Stand-Alone Operation In stand-alone mode, the ScanEM-C Probe is completely self-sufficient and requires nothing else to operate. Quick Set-Up Hold the ScanEM-C Probe in the palm of your right hand as if you were holding a pen. -
Page 11: Setting The Level Dial
‰ Move the ScanEM-C Probe around the tested product or area and observe changes in sound and LED output. The closer the ScanEM-C Probe’s antenna is to the tested area, the greater its resolution. A scan performed an inch or two away from the product can... -
Page 12: Sound On/Off
LED turns on. This way your ScanEM-C Probe will be quiet and the lights will be off until you pass it over an area where the EM level is higher than your reference setting. When... -
Page 13: Em Level Led Bar
™ Operation as a Probe CAUTION! UNLIKE SOME PASSIVE PROBES, THE SCANEM-C PROBE IS NOT A REVERSIBLE DEVICE—DO NOT SUPPLY A SIGNAL INTO ITS OUTPUT! IT CAN PERMANENTLY DAMAGE YOUR SCANEM-C PROBE. Basics The ScanEM-C Probe provides both AC and DC outputs to virtually any piece of test equipment: spectrum analyzer, oscilloscope, frequency counter or multimeter. -
Page 14: Amplified Near-Field Probes For A Spectrum Analyzer
AC performance. Always Set the Level Dial to Zero When Using ScanEM-C as a Probe Î When the Level dial is set to zero, it disables the ScanEM-C Probe’s own indication—the LEDs and the speaker, —preventing any influence on the output signal. -
Page 15: Non-Contact Oscilloscope Probes
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 field strengths of approximately 4 V/m. Non-Contact Oscilloscope Probes... - Page 16 100x1 or even 1,000x1 probes that have extremely high input impedance and low capacitance. That may work in some applications; but for many, the signal attenuated 100 or even 1,000 times is too low to analyze with the scope. The 3M ScanEM-C ™...
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Page 17: Broadband Field Strength Probe For A Multimeter
This is due to an antenna factor of the trace. Experimenting with the ScanEM-C Probe and the oscilloscope probe will show you the difference. Also, the ScanEM-C Probes pick the sum of the emissions from the adjacent traces and wires, so some discretion is needed when assessing the signal on the screen. - Page 18 Measuring 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 quality control inspector can be supplied with the maximum allowed DC voltage at critical points.
- Page 19 ScanEM-C Probe to an oscilloscope. Set the scope input coupling to AC. Bring the tip of the ScanEM-C Probe to the trace or wire you need to test and observe the waveform of the signal on the screen. Keep in mind that the waveform of the radiated signal is different from that of the signal on the trace itself.
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Page 20: Analyzing The Results
“ride” on these lines and generate an electromagnetic field. Many low-frequency signals contain a sufficient amount of high-frequency harmonics for the ScanEM-C Probe to detect. If any of these non-sinewave signals are generated by your equipment, it may be necessary to reduce the emission level in order to satisfy EMI regulations. -
Page 21: Troubleshooting
ScanEM-C Electromagnetic Near-Field Probe will ™ prove to be quick and effective. In some cases the ScanEM-C Probe’s own indication may actually do a better job than a spectrum analyzer in searching for the highest emission levels, since the spectrum analyzer won’t provide a total signal level. -
Page 22: During The Design Phase
During the Design Phase This is the time to ensure agency compliance for your product at the lowest cost and with minimum impact on your schedule. The 3M ScanEM-C ™ Electromagnetic Near-Field Probe can help you do the following: ‰... -
Page 23: Checking The Prototype
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 ScanEM-C Electromagnetic Near-Field Probes with you. ™ Should Things Go Wrong Knowledge of where the EMI hot spots are is your most powerful tool in countering excessive emission levels. -
Page 24: Emc101
Even if agency approval is not an issue, excessive electromagnetic emissions may interfere with the normal operation of other products. Locating the sources of such emissions can help to restore normal operation. The 3M ScanEM-C Probes ™... -
Page 25: The Validity Of The Near-Field Measurements
creates an E-field, although small in magnitude. Similarly, an antenna or an un-terminated wire still carries some current via parasitic capacitance to the ground. Electric and magnetic fields attenuate as distance from the source increases. Each field begins to produce its complementary field. As a result of this, the wave characteristics change with the distance from the source. - Page 26 Probes can locate the source of the offending radiation, saving days or even weeks and a substantial amount of money in unnecessary trial-and-error testing in an agency-certified laboratory. The ScanEM-C Probes have a high detection capability, and depending on circumstances, can narrow problem...
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Page 27: Changing Batteries
‰ If LEDs are getting dim and/or the overall performance of the ScanEM-C Probe deteriorates. ‰ At least once a year. If you are not planning to use the ScanEM-C Probe for several months, remove the batteries to prevent potential damage... - Page 28 ‰ Using the nut driver, loosen the nut on the 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.
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Page 29: What If
Probe’s sound or LED bar while scanning? ‰ Check to see if the tested product is powered up. ‰ Make sure that the ScanEM-C Probe’s antenna is as close to the measured area as possible. ‰ Did you set the Level dial properly? ‰... - Page 30 The ScanEM-C Probe produces warbled sound? Quite often electromagnetic emissions change with time, depending on what is going on in a circuit (i.e. peripheral access). The ScanEM-C Probe may demodulate this signal just like an AM radio would. You may use this...
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Page 31: Quick Guide
‰ Put the Sound slide switch in the position desired (start with On if in doubt) and put your index finger on the Level dial. ‰ Point the ScanEM-C Probe away from the product you are about to test and adjust the Level dial so that only the green LED is on. - Page 32 Specifications Parameter ScanEM-EC ScanEM-HC ™ ™ Electromagnectic Electromagnectic Near-Field Probe Near-Field Probe Field Electric Magentic Frequency Response 2 Mhz-2 GHz 1 MHz-1 GHz Sensitivity (typical) -10 dBm/(V/m) -20 dB/mA AC Load, min. 50 Ohms 50 Ohms AC Output Range 0-1 Vp-p 0-1 Vp-p (into 50 Ohms load) AC Output Resistance...
- Page 34 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 conforming product, or (ii) refund of the purchase price paid by buyer for each non-conforming product, within a reasonable time after written notification of said non-conformance and return of said product to 3M.
- Page 35 产品中有毒有害物质或元素的名称及含量 Name and Content of Hazardous Substances or Elements 有毒有害物质或元素 (Hazardous Substances or Elements) 部件名称 铅 汞 镉 六价铬 多溴 多溴二 (Part or Component Name) 联苯 苯醚 （Hg） （Cd） （Cr(VI)） (Pb） （PBB） （PBDE） ○ ○ ○ ○ ○ 电容引脚 × (Termination in capacitor) ○...
- Page 36 If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M product. Except where prohibited by law, 3M will not be liable for any indirect, special, incidental or consequential loss or damage arising from this 3M product, regardless of the legal theory asserted.
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