1482 Series Standard Inductors are the same specs as GenRad inductance standard.
These inductors are accurate, highly stable standards of self inductance for use as a low frequency reference of working standard in the laboratory. Records extending over 25 years, including those of inductors that traveled to national laboratories in several countries for calibration, show long-term stability well within ± 0.01%.
The 1482 Series Standard Inductors are the standard of choice in metrology labs, and still used today by standards bodies around the world.
1482 Series Standard Inductor.
|1482||1482 Series Standard Inductor
Uniformly wound toroid on a ceramic core.
Packed in a mixture of ground cork and silica gel.
Cast with a potting compound into a cubical aluminum case.
Calibration Certificate Traceable to NIST.
Each inductor is a uniformly wound toroid on a ceramic core. It has a negligible external magnetic field and hence essentially no pickup from external fields.
The inductor is resiliently supported in a mixture of ground cork and silica gel, after which the whole assembly is cast with a potting compound into a cubical aluminum case. Sizes of 1 mH and above have three terminals, two for inductor leads and the third connected to the case, to provide either a two- or three-terminal standard.
The 100 µH size has three additional terminals for the switching used to minimize connection errors.
Stability: Inductance change is less than ±0.01% per year.
Calibration: A certificate of calibration is provided with each unit, giving measured values of inductance at 100, 200, 400, and 1000Hz, with temperature and method of measurements specified.
These values are obtained by comparison, to a precision, typically, of better than ±0.005%, with working standards whose absolute values, determine and maintained in terms of reference standards periodically certified by the National Institute of Standards and Technology, are known to an accuracy typically ±(0.02%+0.1µH) at 100Hz, ±(0.1%+0.1µH) for the 1482-B Temperature Coefficient of Inductance: Approximately 30ppm/ºC. Minute temperature corrections may be computed from DC resistance changes. A 1% increase in resistance, produced by temperature increase of 2.54°C corresponds to 0.0076% increase in inductance.