The GenRad 1403 Standard Air Capacitors are stable, three-terminal standards in decimal values from 0.001 pF to 1000 pF. For measurement at 100 pF and below, a three terminal connection increases the accuracy by eliminating the uncertainty in the measurement introduced by the capacitances between the capacitor terminals and ground.
The GenRad 1403 High Frequency Standard Capacitors are ideal for use with the GenRad / IET 1615-A Capacitance Bridge as the terminals are arranged to plug directly into the unknown terminals of the bridge.
The capacitance change is less than 0.01% at frequencies to 2 MHz for 1 pF and 200 kHz for 1000 pF standard making the standard ideal for verifying LCR meters and bridges at frequencies other than 1 kHz.
Dielectric losses are not detectable meaning that Df and tan Delta are essentially zero; there is no solid dielectric in the direct-capacitance field. All have shielded terminals, both of which are insulated from the case.
GenRad 1403 Series High Frequency Standard Capacitor Basic Specifications
Calibration: A certificate of calibration is supplied with each unit giving the measured capacitance at 1 kc/s and at a specified temperature. The measured value is the direct capacitance between shielded terminals when the capacitor has at least one lead completely shielded and its case connected to a guard point.
This value is obtained by comparison, to a precision better than ±(0.01% + 0.00001 pF), with working standards whose absolute values are known to an accuracy typically ±0.01%, determined and maintained in terms of reference standards periodically certified at NIST
Stability: Capacitance change is less than 0.05% per year.
Temperature Coefficient of Direct Capacitance: Typically 20 to 40 ppm per degree between 20° and 70°C. The larger coefficients apply to the smaller capacitance values.
Terminals: GR874 Coaxial Connectors, which provide complete shielding of the leads.
| Type | Capacitance | Accuracy | Peak Volts | Dissipation Factor |
| 1403-A | 1000pF | 0.1% | 700 | 0.000002 |
| 1403-D | 100pF | 0.1% | 1500 | 0.000002 |
| 1403-G | 10pF | 0.1% | 1500 | 0.000002 |
| 1403-K | 1pF | 0.1% | 1500 | 0.000002 |
| 1403-N | 0.1pF | 0.1% | 1500 | 0.000002 |
| 1403-R | 0.01pF | 0.3% | 1500 | 0.000002 |
| 1403-V | 0.001pF | 1.0% | 1500 | 0.000002 |
