The 1409 Standard Capacitors are fxed value capacitors with very high stability for use as two, three, or fve-terminal laboratory reference standards.Typical capacitors, observed over more than 15 years, have shown random fluctuations of less than ±0.01% in measured capacitance with no evidence of systematic drift.The capacitors of ≤1 µF consist of a silveredmica and foil pile, spring-held in a heavy-duty metal clamping structure for mechanical stabil-ity. The units 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 dessication. 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.
• 0.001 µF to 1000 µF
• Excellent stability: ±100 ppm/year
• Two-to-fve terminal confguration,
depending on model
• 2-terminal and 3-terminal calibrations
provided, where applicable
• Use to verify meter and instrumentation
calibration
Calibration and Test Conditions:
Calibrated at 23°C, <50% RH, Traceable to SI
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. The Adjustments to Nominal specifed in the
table above apply to 2-terminal measurements.
10 µF - 1000 µF: Units are calibrated as 5-terminal capacitors, "series
model"
Series Inductance:
for 0.01 µF - 1 µF: typically < 0.06 µH
Series Resistance:
for 0.01 µF - 0.1µF: 0.02 Ω
for 1 µF: 0.03 Ω
Frequency Characteristics:
Varies as √f above 100 kHz. See fgure 1.
Leakage Resistance:
5,000 ohm-Farads or 100 GΩ, whichever is less
Environment:
Operating: +10 to +40°C, <80% RH
Storage: -20 to +65°C
