Ultra Precision Resistor MZH - metal foil

Ultra-precision metal foil precision resistor with an almost constant characteristic

The MZH series precision resistor is designed for applications where the smallest resistance changes directly determine measurement accuracy – for example in reference networks, precision voltage dividers or sensitive amplifier stages. Metal foil technology on an aluminium oxide substrate provides very high long-term stability and very low noise, so that once-adjusted circuits exhibit only minimal drift over time.

A key feature of the MZH is the almost temperature-neutral resistance behaviour in the range from 0 °C to 50 °C: within this temperature window, the temperature coefficient is practically zero and remains at < ±0.6 ppm/°C, which is negligible even in high-resolution measurement chains. Over the full specification range, the resistor operates with a temperature coefficient of < ±1 ppm/°C @ 25 °C and resistance tolerances from ±0.005%. This places the MZH series among ultra-precision resistors, where both the absolute value and the temperature dependence are tightly controlled.

The resistance range from 100 Ω to 100 kΩ covers typical values for precise voltage and current measurements, reference dividers and bridge circuits. Rated power is 0.3 W at 70 °C, with a maximum working voltage of 300 V and an operating temperature range from −65 °C to +150 °C. In this combination, the MZH is particularly suitable wherever both high accuracy and elevated ambient temperatures or self-heating of the housing must be considered – for example in laboratory and calibration equipment, precision power supplies or measurement modules in industrial systems.

The hermetically sealed metal housing reliably protects the resistive element against moisture, contamination and mechanical influences, while also providing effective shielding against external electrical interference. As a result, the characteristics remain stable even under changing environmental conditions, and sensitivity to leakage currents or surface moisture is significantly reduced. Combined with the very tight tolerances and low temperature drift, the MZH series is especially well suited as a component for precise, reproducible measurement setups and reference applications.

Options

• Resistance range: 100 Ω–100 kΩ with freely selectable values (in xxkxxx format e.g. 10k000 or 10k100)
• Resistance tolerances: ±0.005%, ±0.01%, ±0.02%, ±0.05%, ±0.1%, ±1%
• Lead spacing: 3.81 mm or 5.08 mm (radial leads)