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1482 Series INDUCTANCE STANDARD INDUCTOR
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1482 Series Inductance Standard Inductor |
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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.
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Uniformly
wound toroid on a ceramic core
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Packed
in a mixture of ground cork and silica gel
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Cast
with a potting compound into a cubical aluminum case
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Calibration
Certificate Traceable to NIST
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1482-B
100µH
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1482-E
1mH
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1482-H
10mH
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1482-L
100mH
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1482-P
1H
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1482-T
10H
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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.
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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 2.54ºC
corresponds to 0.0076% increase in inductance.
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| Description |
Nominal
Inductance |
Adjustment
Accuracy
(Percent) |
*Resonant
Frequency
(kHz) |
*DC
Resistance
W |
*Q at
100Hz |
Milliamperes
rms for: |
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1482-B
1482-E
1482-H
1482-L
1482-P
1482-T |
100µH
1mH
10mH
100mH
1H
10H |
±0.25
±0.1
±0.1
±0.1
±0.1
±0.1 |
900
500
220
70
15
5 |
0.083
0.84
8.2
81
616
6400 |
0.76
0.75
0.77
0.78
1.02
0.98 |
1550
490
156
50
18
5.6 |
6010
1890
600
192
70
22 |
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