The MC95RW sensor provides a strong response from Extremely Low Frequency (ELF) through Very Low Frequency (VLF) ranges, with a very strong maximum at resonance, which is near 1800 Hz. Its frequency response is the same as MC95R shown in the graph. Each sensor is tested using NIST traceable methods and instruments, and the NIST traceable calibration data table is delivered with each sensor.
The resonant frequency (usually near 1800 Hz) may vary considerably due to individual assembly variations and the complex output impedance the sensor output is connected to. So the calibration curve (Vo/field) may differ from your results due to different output impedances at resonance and higher frequencies.
The calibrated voltage output was measured between the red and yellow wires. The green wire is a center-tap, it is not necessary to use it, the green wire provides 1/2 of the voltage output to either end of the coil (to the red or to yellow wire).
Twisting the wires together minimizes pickup of stray fields.
You can use the little red plastic connector attached to ends of the wires, or you can cut it off.
If soldering to a connector or coaxial or other transmission line: normally the red and yellow wires are used. The red or yellow can be soldered to the center conductor, and the other (red or yellow) to the outer conductor.
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