BNC Cable
Choose desire length: 12 inch or 36 inch long coaxial, BNC male connector on each end.
BNC Cable 12 inch (Cat. #K128-BNC-12in) ............ $1.95 
BNC Cable 36 inch (Cat. #K128-BNC) ............ $4.95
FREQUENCY GENERATOR
"Low Frequency Test Signal Generator"
Make some waves! Need a source of 20 Hz to 150 kHz frequencies" Handy little unit fits in your shirt pocket and is very simple to operate. Produces nice clean sine waves (adjustable intensity up to 1.2V rms) or square waves (p to 8V p-p) with 5% frequency accuracy. Simply dial in the desired frequency. Uses 9V battery (50 hrs typical use). Includes low battery indicator, test leads and 9V battery.
Check the response of your gaussmeter to various frequencies (connect the Frequency Generator to the Degaussing Coil to generate several mG fields at various frequencies), test your frequency counter, connect to a speaker/headphones to test your hearing range! Also great for field/bench service of audio equipment, car stereo, etc. Bargain price!
| Generator frequency | 20Hz~150KHz in 46 steps ±0.5dB |
| Sine wave output | 1.2V RMS minimum in 600 Ohm |
| Distortion | less than 0.05% (200Hz~15KHz)
0.1% (50Hz~30KHz)
less than 0.3% (20Hz~100KHz) |
| Square wave output | 8V p-p max. (no load) |
| Rise/fall time | less than 0.5µsec |
| Overshoot | less than 2% |
| Duty ratio | 50% ±5% |
| Output impedence | 1 KOhm |
| Dimensions | 3 3/8" (W) x 6" (H) x 1" (D) |
Frequency Generator (Cat. #K423)....... $74.95
Magnetic Shielding Alloys
MagnetShield
High Saturation Magnetic Alloy
First line of defense for shielding strong magnetic fields from magnets, speakers, small transformers and motors. Strong magnetic fields are harder to shield because they tend to "saturate" the shielding material. This 4" wide foil is a hefty .010" thick and has an exceptionally high magnetic saturation of 21400 Gauss and maximum permeability of 4000. Tin plated for excellent corrosion resistance and better conductivity, it can be soldered or painted.
MagnetShield typically reduces fields up to a factor of 2 or 3 depending on size/shape of the shield. Can be used in multiple layers, and/or in combination with a higher permeability alloy such as Joint-Shield for higher attenuation. Annealing is not necessary with this material. Compare the magnetic shielding of various houshold items: Aluminum pie plates, steel cookware, Silver spoon etc.
For increased shielding effectiveness, consider the following strategies:
- Good: Layer(s) MagnetShield
- Better: One or more layers of MagnetShield (closest to the source of field), followed by one or more layers of a high permeability material such as Joint-Shield or MagStop Plate.
Applications Notes:
- The magnets will be attracted to the shield (this is true of ALL magnetic shielding alloys). If you want to shield 2 adjacent magnets from eachother, each magnet should have its own shield.
- The size, shape, and position of the shield all matter in terms of shield performance. For example, larger shields are better than small shields. Closer to the magnet is better than farther from the magnet. And parallel to the magnetic field lines is better than perpendicular to them.
- You will likely need more than one layer of shielding material, depending on the strength of your magnets. More layers = more attenuation.
How do I stop the attraction/repulsion between 2 magnets"
Click here for Specs on Magnet Shield
4 inch wide Ribbon:
MagnetShield (Cat. #K274) ........................... $4.50/lin ft
GIRON
Breakthrough In Magnetic Shielding Flexibility
GIRON Magnetic Shielding Film, which does not contain Nickel, is unlike any other magnetic shielding material available on the market today. Suitable for high field strength applications requiring high saturation and good permeability, it is both thin and strong, and unlike Mu-metal™ it is very tolerant to bending or shaping without losing its shielding properties.
GIRON is a woven, laminated material. Cuts neatly with snips or sheet metal tools, and can be used either flat or molded into shapes for best performance.
Suitable for small shields on magnets, motors, speakers and appliances such as refrigerators, vacuum cleaners etc. Also great for lining car floor or firewall. Perfect for full or partial wall / floor shielding in rooms too! Can be glued, taped, nailed, screwed or riveted into place. Could even be used to make a (heavy weight) vest to shield a person's torso! Works with AC or DC magnetic fields (0-1000 Hz), and will tolerate temperatures from 32° to 122°F. Coating is UV sensitive, cover if installation is exposed to direct sunlight.
- Initial permeability: 500
- Relative permeability: 7000
- Saturation induction: 2,0 T
- Curie Temp.: 740°C (1364°F)
- Weight is approx 1 lb per square foot
-
25.5 inch wide, 1 mm thick. Weighs 3.5 Kg/m² (about 15 pounds per 10 foot length). Edges are sharp!
GIRON (Cat. #K273) ............... $48.95 per linear foot
Finally, a way to actually "see" DC magnetic fields from permanent magnets or magnetized metals without messy iron filings! You can use this amazing film over and over to view the location and number of poles on any magnet. Just lay the card on the magnet to see the polar pattern. Magnetic poles appear as dark areas and the light areas represent where the N and S poles meet. Flexible thin rubber magnets show up as stripes. A great inexpensive magnetic detector for finding objects in your environment that have become magnetized. Uses no batteries. Also great for science projects. Dimensions: 2-1/2" x 4"
Remember playing with iron filings and a magnet" The magnet makes the filings stand up on end and arrange themselves in beautiful patterns according to the magnetic field lines. The problem was that the filings would stick to the magnet so hard it was difficult to remove them AND filings that spilled made a huge (and rusty) mess. This clever device solves both problems by enclosing the iron filings in a clear hard plastic case! Now students, children and adults too can enjoy learning about magnetic attraction the fun and clean way. You must supply your own magnet, but just about any magnet will do. And when you are done, just put it away in a drawer and there's nothing to clean up. 3" round.
Looking for the cheapest way to determine if something is magnetized" Want a simple device for comparing magnets" Doing a school project" Lost" For hundreds of years, mankind has used the trusty compass to guide him through the Earth's magnetic field. Measure the deflection of the needle from magnetic North at known distances using this nice 1.75 inch diameter compass to quantify and compare DC magnetic fields, track down magnetized components, or evaluate magnetic shielding performance. Extra large, easy to hold, and very easy to see. High resolution with large needle. Aluminum case with loop for key ring or lanyard. Check DC magnetic fields, identify magnetized steel, or just find your way home!
Much cleaner than iron filings. Makes a great science fair project too. Compass must be held horizontally to operate. May look different from picture.
DC magnetic fields can develop in many steel or iron objects if they have been exposed to magnetic fields, current, or friction. Even structural members in homes and barns have become magnetized due to stray voltage.
This hand-held device detects residual magnetism in steel parts quickly and accurately. Simply place the test edge near or against the object being tested, and the needle gauge points to a reading representing the magnetism in the object at that site as well as polarity.
Will also verify thoroughness of de-magnetizing. Check out your car, bed frame, desk furniture or any other metal objects you spend time with. Can also be used to check the strength of (weak) magnets. Two models in stock: -20 to +20 and -100 to +100 Gauss.
For Strong Field Applications
Probe (High Linearity Hall Generator) with 3.5 ft cable is included providing nearly linear response from DC to 10 Hz. Useful 4 ranges covering 0 - 20, 200, 2000, 20,000 Gauss with a 3% accuracy guarantee. Two year parts and labor warrantee. 200mV DC recorder output (which can be used with 
KiloGaussmeter with transverse probe
Our Most Sensitive DC Gaussmeter
Zero Gauss Chamber (Cat. #K3105) ......... $395.00 
Common ELF magnetic field frequencies are within the range of human hearing. This simple set up converts the AC magnetic signal directly into a dramatic corresponding sound signal. A 60 Hz powerline field sounds like a 60 Hz hum (a low note on piano keyboard). Harmonics can easily be heard, as well as clicks, static, and hash. LED displays are especially noisy. The strength of the field is proportional to loudness.
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by Rudolf F. Graf
Includes 20 simple and fun experiments that allow you to learn about electric charges with a simple experiment using modeling clay and a plastic straw; about voltage using a bowl, paper towels, and a raw egg; about conductors with some clothespins, aluminum foil, and a flashlight bulb; plus dozens of additional suggestions for developing your own science fair projects.
All experiments are safe, use inexpensive household materials, and involve a minimum of preparation and clean up. Clearly written. 1994.
