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

Prices range from $5,930.00 to $6,575.00

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The GenRad 1404 Series standard capacitors are the standard of choice in metrology labs, and still used today by standards bodies around the world. These capacitors have been designed as primary reference standards of capacitance with which working standards can be compared.

In combination with an accurately known external resistor, the GenRad 1404 standard capacitors becomes a standard of dissipation factor

All critical parts of the plate assembly are made of Invar for stability and low temperature coefficient. After heat cycling and adjustment, the assembly is mounted in a heavy brass container, which, after evacuation, is filled with dry nitrogen under pressure slightly above atmospheric and sealed. The container is mounted on an aluminum panel and protected by an outer aluminum case. Each capacitor is subjected to a series of temperature cycles to determine hysteresis and temperature coefficients and to stabilize the capacitance

MODELS

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

Specification

SPECIFICATIONS

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

C_H

C_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