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The dielectric constant (k), or relative permittivity (εr), of a material is a fundamental electrical property that indicates how effectively the substance can store electrical energy in an electric field. It is quantitatively defined as the ratio of the electrical capacitance of a capacitor using the material as the dielectric medium (Cs) to the capacitance of the same capacitor with a vacuum (or air, C0) between its plates: k = Cs/C0. Measurement for both solids and liquids typically involves placing the sample within a specially designed dielectric cell. For solids, the sample must be precisely dimensioned to fit without air gaps, while liquids are simply poured to fill the cell's volume.
Model and Make
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Specifications
Key Features:
Probe Arrangement
- Two individually spring-loaded probes mounted on a high-quality alumina stand.
- Sample plate with embedded thermocouple beneath ensures accurate temperature measurement.
- This probe assembly doubles as the lid of the temperature-controlled oven
Oven
- High-quality PID-controlled oven, with Kanthal‑D heating elements.
- Features sintered alumina fixtures, heat shields, and top safety cover.
- Supports rapid heating/cooling cycles
Temperature Controller
- PID/ON‑OFF control with adjustable P, I, D parameters or auto-tuning.
- Range: Ambient to 600 °C
- Input: K-type (Chromel–Alumel) thermocouple
- Display: Dual-color 7‑segment LED (PV in red, SV in green)
- Power: 100–240 VAC, 50/60 Hz
- Accuracy: ±0.3 %; sampling time: 0.5 s
Capacitance Meter
- CMOS-based digital meter with auto zeroing/polar selection.
- LCD with backlight, data-hold, 0.1 pf resolution
- Measurement range: 0.1 pF to 20,000 μF, across nine scales
- Accuracy: ±0.5 % (up to 200 μF) and ±2–4 % for the highest ranges
- Test frequency: 800 Hz (small capacitance ranges), decreasing to 8 Hz (largest ranges)
Applications:
- Dielectric constant analysis for dielectric coolants
- Dielectric constant analysis for various solids and liquids