RESISTANCE DECADE BOX HARS IET LABS

Resistance Decade Box HARS Series IET Labs

High-Precision Resistance Decade Box for Lab and Industrial Applications

The HARS Series Resistance Decade Box from IET Labs is engineered to deliver high accuracy and reliability across a broad resistance range. Designed for use in metrology labs, production test environments, and educational institutions, the HARS Series provides superior stability, minimal thermal EMF, and exceptional performance for both DC and AC measurements.

With models offering resistance values from 1 mΩ to 111 MΩ, the series includes:

• HARS-X: High-accuracy model (±0.01%)

• HARS-B: Economical model (±0.1%)

• HARS-X2: Double power version for higher dissipation applications

The use of solid silver-alloy switches and gold-plated tellurium-copper binding posts ensures low contact resistance and high durability. A temperature coefficient as low as 5 ppm/°C and zero resistance under 1 mΩ per decade (HARS-X) make it ideal for calibration tasks and sensitive measurements.

Features

• Precision resistance substitution from 1 mΩ to 111 MΩ

• Two accuracy models:

  • HARS-X: ±(0.01% + 2 mΩ)

  • HARS-B: ±(0.1% + 4 mΩ)

• Excellent stability and low zero resistance

• Durable silver-alloy contacts

• Gold-plated low-EMF binding posts

• Custom configurations and rack-mount available

• Compatible with DC and AC applications

Applications

• Resistance calibration and meter verification

• Temperature sensor simulation (RTDs/PT100)

• Component and cable resistance testing

• Laboratory and industrial electronics validation

Specifications

• Resistance Range: 1 mΩ to 111 MΩ

• Accuracy:

  • HARS-X: ±(0.01% + 2 mΩ)

  • HARS-B: ±(0.1% + 4 mΩ)

• Resolution: 1 mΩ steps

• Number of Decades: Up to 11

• Zero Resistance: <1 mΩ per decade (HARS-X)

• Temperature Coefficient: 5 ppm/°C typical

• Power Rating:

  • Standard: 0.1 W per resistor

  • HARS-X2: up to 0.2 W per resistor

• Contact Type: Silver-alloy switches with positive wiping

• Terminals: Gold-plated tellurium-copper binding posts

• Terminal Spacing: 3/4 inch standard

• Construction: Low thermal EMF, durable enclosure

• Mounting Options: Bench-top and rack-mount

• Customization: Available upon request

• Frequency Response: Excellent for both DC and AC use

• Origin: Made in the USA

The HARS Series is the ideal solution for high-precision resistance simulation in critical measurement applications.