The GenRad 1409 Standard Capacitor is series of highly stable, cost-effective capacitance standards. With a low temperature coefficient and low losses, these standard capacitors come in a wide range of capacitance values from 1 nF - 1,000 µF.
From 1 nF to 1 µF, the standard capacitors are constructed with silvered-mica and foil for use as two- or three-terminal lab standard. From 1 µF to 10 µF the units are made of hermetically sealed polystyrene for 10 μF. Above 10 μF the capacitor is hermetically sealed polycarbonate,
Typical capacitors, observed over decades, have shown random fluctuations of less than + 0.01% in measured capacitance with no evidence of systemic drift.
The elements used in 1409 Standard Capacitors are selected for low dissipation factor and are stabilized by heat cycling. They are housed in cast aluminum cases, along with silica gel which provides continuous desiccation. These cases are sealed with high-temperature wax. A well is provided in the wall of the case for insertion of a dial-type thermometer. Three jack-top binding posts are provided on the top of the case, and removable banana plugs on the bottom, for convenient parallel connection without error
For convenient parallel connection without error, three jack-top binding posts are provided on the top case, with removable plugs on the bottom.
BASIC SPECIFICATIONS
Calibration: An accredited certificate of calibration traceable to the SI, through a National Metrology Institute is provided with each unit.
Test Conditions: Calibrated at 23°C, <50% RH,
1 nF - 1 μF: Units are calibrated as both 2-terminal and as 3-terminal capacitors. For 2-terminal measurements, the LO terminal is shorted to the GND terminal.
10 μF - 1000 μF: Units are calibrated as 5-terminal capacitors, "series model"
| Nominal value | Model | Adjustment to nominal | Temperature coefficient(ppm/°C) | Calibration frequency | Dissipation(typical) | Stability
(per year) |
Terminals | Capacitor type |
| 1 nF | 1409-F | ±0.02% | 20 | 1 kHz | 0.0003 | ±100 ppm | 2 bp's + gnd | Silvered Mica mechanically stabilized hermetically sealed |
| 10 nF | 1409-L | ±0.02% | 20 | 1 kHz | 0.0003 | ±100 ppm | ||
| 100 nF | 1409-T | ±0.02% | 20 | 1 kHz | 0.0003 | ±100 ppm | ||
| 1 µF | 1409-Y | ±0.02% | 20 | 1 kHz | 0.0002 | ±100 ppm | ||
| 10 µF | 1409-10µF | ±0.04% | ±50 | 100 Hz | 0.0005 | ±200 ppm | 4 bp's + gnd | Metallized Polypropylene Sulfide (MPPS) hermetically sealed |
| 100 µF | 1409-100µF | ±0.05% | ±50 | 100 Hz | 0.001 | ±500 ppm | ||
| 1,000 µF | 1409-1000µF | ±0.4% | -150 | 100 Hz | 0.001 | ±500 ppm |
The Adjustments to Nominal specified in the table above apply to 2-terminal measurements.
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