The H series resistors are oil-filled, hermetically sealed ultra precision resistors and are used as secondary standards for metrology applications.
The hermetic sealing eliminates the ingress of moisture and oxygen, while the oil acts as a thermal conductor, thus eliminating the long-term degradation elements of unsealed resistors, while at the same time allowing the device to accept short periods of overload without degradation.
With accuracies of 0.001 %, a resistance range from 5 Ω to 1.84 MΩ, and long term shelf life of less than 2 ppm, these devices are virtually secondary standards that can be carried in sets for daily or periodic calibration of factory measurement equipment.
The H series is available with laboratory and metrology level precision and long-term stability with additional in-house oriented processes such as: chip stabilization, special TCR plotting, additional treatments for ultra stability and special post manufacturing operations (PMO).
Temperature coefficient of resistance (TCR): ± 2 ppm/°C typical (- 55 °C to + 125 °C, + 25 °C ref.). For ultra high performances (instrumentation and metrology)
Resistance range: 5 Ω to 1.84 MΩ (higher or lower values of resistance available)
Power rating: 0.3 W to 2.5 W at + 25 °C
Tolerance: to ± 0.001 % (10 ppm)
Load life stability to ± 0.002 % (20 ppm) at 25 °C, 2000 h at rated power
Load life stability can be considerably improved through in-house stabilization
Shelf life stability: ± 2 ppm for at least 6 years (unaffected by humidity)
Electrostatic discharge (ESD) up to 25 000 V
Rise time: 1 ns effectively no ringing
Thermal stabilization time < 1 s (nominal value achieved within 10 ppm of steady state value)
Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)
Thermal EMF: 0.05 µV/°C typical
Voltage coefficient: < 0.1 ppm/V
Non-inductive: < 0.08 µH
Non-inductive, non-capacitive design
Non hot spot design
Terminal finish available: lead (Pb)-free or tin/lead alloy