RESISTORS DESIGNED FOR USE AT AC
SRAC STANDARD

RESISTORS DESIGNED FOR USE AT AC

  • Precision resistance standards designed for use up to 10 kHz
  • Available for values from 1 mΩ - 10 MΩ
  • Bnc option available (add -bnc to end of part number)
  • Contact IET for custom resistance values
  • Very stable <20 ppm/year for most values at ac and dc
  • ISO-17025 accredited calibration at dc and 1 kHz Included
  • < 25 ppm difference between dc / 1 kHz for resistances ≤ 100 kΩ
  • Excellent temperature coefficient, as low as 1 ppm/°C
Type： Resistance Standard
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Most precision standard resistors are sealed. Where sealed resistors are more stable, they have a poor frequency response.
IET has designed and manufactured our SRAC Series which has excellent ac frequency response while maintaining long term stability of less than 20 ppm.

Calibration: Unlike most resistors, where the calibration value is only available at dc, IET Labs provides an ISO-17025 accredited calibration of these resistors at dc and at 1 kHz. Sweep calibrations and other frequencies are available for a premium.

Configuration: Units come standard with 4 gold plated low thermal emf binding posts, plus ground for use in both 2, 3 or 4-Wire kelvin applications. For a small premium we can make this in any configuration you require including bnc.

Decade Box: If you are looking for a Decade Resistor with very strong ac performance consider our 1433 Series

Frequency response lower resistance, for example, 1 Ω will have a much better frequency response than higher resistance, for example, 10 MΩ

Because calibration uncertainties are much better at dc than ac, IET recommends that for resistance values below 1 MΩ it is recommended to use the dc value for the ac value at 1 kHz. For resistance values of 1 MΩ and 10 MΩ it is recommended to use the ac value.

The frequency response for SRAC values of 100 kΩ and lower is based upon the formula below;

 

 

AC Resistors