- Available in 10 pF, 100 pF,1000 pF, 5000 pF, 10,000 pF
- New 5 nF and 10 nF standards available
- A national laboratory standard
- For calibrating working standards
- Standard for dissipation factor
- 5 year warranty included
- 20 ppm/year stability, history has shown this to be a very conservative specification
- Hermetically sealed in dry nitrogen
- ISO-17025 accredited calibration Included
Primary Standard Capacitors
Uses:- Primary Capacitance Standard
- Standard of Dissipation Factor
- Charge Calibration
- dc Current Calibration
GenRad / General Radio 1404-10nF (10,000 pF) Recently Released
GenRad / General Radio 1404-A (1000 pF) Primary Standard Capacitor
GenRad / General Radio 1404-B (100 pF) Primary Standard Capacitor
GenRad / General Radio 1404-C (10 pF) Primary Standard Capacitor
1See ISO-17025 Scope of Accreditation (A2LA) for our complete list of accredited calibration capabilities.
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.
Model | Temperature Coefficient |
1404-A 1404-B | 2 ±2 ppm/°C from -20°C to +65°C |
1404-C | 5 ±2 ppm/°C from -20°C to +65°C |
1404-5 nF 1404-10 nF | 4 ±2 ppm/°C from -20°C to +65°C |
Temperature Cycling: For temperature cycling over range from -20°C to +65°C , hysteresis (retraceable) is less than 20 ppm at 23°C.
Stability:
Model | Long Term Drift | Max Change with Orientation |
1404-A 1404-B 1404-C | less than 20 ppm per year | 10 ppm and completely reversible |
1404-5 nF 1404-10 nF | less than 40 ppm per year | 10 ppm and completely reversible |
Dissipation Factor: Less than 10-5 at 1 kHz.
Residual Impedance:
Model | CH | CL | L |
1404-A 1404-B 1404-C | 30 pF | 28 pF | 0.05 µH |
1404-5 nF 1404-10 nF | 130 pF | 127 pF | 0.1 µH |
Max Voltage:
Model | Maximum Voltage |
1404-A 1404-B 1404-C | 750 V peak |
1404-5 nF 1404-10 nF | 100V peak |
Terminals: Two BNC coaxial connectors (legacy locking G874 coaxial connectors are available). Outer shell of one connector is ungrounded to permit capacitor to be used with external resistor as a dissipation factor standard.
Mechanical:
Model | Dimensions | Weight |
1404-A 1404-B 1404-C | (16.9 cm H x 17.2 cm W x 20.4 cm D (6.63" x 6.75" x 8") | 3.9 kg 8.5 lb 6.4 kg 14 lb Shipping |
1404-5 nF 1404-10 nF | (23 cm W x 23 cm H x 22 cm D) 9" x 9" x 8.5" | 16 kg 35 lb 18 kg 40 lb Shipping |