The GenRad 1482 Standard Inductors are the standard of choice in metrology labs. Used today by national metrology institutes and primary standards bodies around the world, these inductors have no peer or equivlent.
IET continues to produce the 1482 standard inductors to
the same exacting specs as General Radio. These standard 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 30 years, including those of standard inductors that traveled to national laboratories in several countries
for calibration, show long-term stability well within ±0.01%.
Each
standard 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 potting compound into a cubical
aluminum case.
Sizes of 500 µH and above have three terminals, two for
the inductor leads and the third connected to the case, to provide either a two-
or three terminal standard. The 50-, 100-, and 200 µH sizes have three
additional terminals for the switching used to minimize connection
errors.
For comparing other inductors with these standards, the 1689 or
1693 Digibridge is recommended.
Watch a video about the
GenRad 1482 Series Inductance Standard
BASIC SPECIFICATION (Full specifications can be found on the datasheet)
Calibration: A
certificate of calibration that is accredited by A2LA to ISO-17025 is provided
with each unit, giving measured values of inductance at 100, 200, 400, and 1000 Hz, with test conditions and method of measurements specified. These values are obtained by comparison, to a precision, typically, of better than 0.005%, with standards whose absolute values, traceable to the International System of Units (SI), are known to an accuracy typically of (0.02%+0.1μH) at 100 Hz; (0.1%+0.1
μH for the 1482-B).
Stability: Inductance change is less
than 0.01% per year.
