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Type 1404-B/C

  • ModelType 1404-B/C
  • MakerGeneral Radio Company
  • DescriptionReference Standard Capacitor
  • Rental문의요망
  • Stock문의요망
  • A National Laboratory Standard
  • For Calibrating Working Standards
  • Standard for Dissipation Factor
  • Available in 10, 100 and 1000 pF
  • 20 ppm/year Stability, Typically Better
  • Hermetically Sealed in Dry Nitrogen

The IET / General Radio 1404 Series Reference Standard Capacitors have been designed as primary reference standards of capacitance with which working standards can be compared. IET’s 1620A and 1621 Precision Capacitance Measuring Systems are particularly well suited for this purpose and can be conveniently used to calibrate accurately a wide range of working standards in terms of a 1404 Reference Standard Capacitor.


Calibration: A certificate of calibration is supplied with each capacitor, giving the measured direct capacitance at 1 kHz, 30 Vac and 23° ±1°C. The measured value is obtained by a comparison to a precision better than ±1 ppm with working standards whose absolute values are known to an accuracy of ±5 ppm, determined and maintained in  terms of reference standards periodically traceable to an SI.

Adjustment Accuracy: The capacitance is adjusted before calibration with an accuracy of ±5 ppm to a capacitance about 5 ppm above the nominal value relative to the capacitance unit maintained by the reference standards.

Temperature Coefficient of Capacitance:  A measured value with and accuracy of ±1 ppm/°C is given on the certificate. Temperature Coefficient : 2 ±2 ppm/°C from -20°C to +65°C





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