Standard Resistance Box SRB-17

Description

Technical Specifications

• Model: SRB-17

• Type: Standard Resistance Box / Reference Standard

• Accuracy:

  • ±0.5% for 20 µΩ & 50 µΩ

  • ±0.2% for all other ranges

• Resistance Range: 20 µΩ to 100 kΩ

• Resistance Steps (14 values):

  • 20 µΩ, 50 µΩ, 100 µΩ

  • 1 mΩ, 10 mΩ, 50 mΩ, 100 mΩ, 500 mΩ

  • 1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ

• Resistor Material: High-stability Manganin wire coils

• Power Rating: > 1 Watt per resistance value

• Maximum Current Capacity:

  • 20 µΩ – 250 A

  • 50 µΩ – 150 A

  • 100 µΩ – 125 A

  • 1 mΩ – 50 A

  • 10 mΩ – 15 A

  • 50 mΩ – 6 A

  • 100 mΩ – 3.5 A

  • 500 mΩ – 2.5 A

  • 1 Ω – 1.25 A

  • 10 Ω – 0.6 A

  • 100 Ω – 0.12 A

  • 1 kΩ – 10 mA

  • 10 kΩ – 3 mA

  • 100 kΩ – 1.2 mA

• Compatible Instruments: Kelvin Double Bridge (KDB) and Digital Micro-Ohm Meter

• Calibration: Accuracy verifiable by NABL-accredited laboratories (testing charges extra)

• Applications: Calibration labs, wire & cable industry, QA departments, R&D centers, educational institutes, testing facilities

📋 Product Overview

The Standard Resistance Box SRB-17 is a premium-grade reference instrument engineered for high-current, low-resistance measurement and precision calibration applications. With an extended resistance range from 20 micro-ohms to 100 kilo-ohms, it provides exceptional flexibility for both ultra-low resistance testing and higher-value calibration tasks.

Manufactured using manganin wire resistance coils, the SRB-17 offers excellent stability and minimal temperature-based drift. Its graded accuracy — ±0.5% at micro-ohm levels and ±0.2% across all remaining values — ensures dependable performance where measurement confidence is critical. Each resistance step is rated at more than 1 watt, allowing safe operation under substantial current loads.

Featuring 14 precisely selectable resistance values, the SRB-17 is ideally suited for use with Kelvin Double Bridges and Digital Micro-Ohm Meters, making it a reliable reference standard for calibration, instrument verification, quality assurance testing, and educational experiments.

The unit is widely used in wire and cable manufacturing, metrology labs, quality control facilities, testing laboratories, and engineering training institutes where both accuracy and high current capability are required.

⚡ Key Features

• Wide resistance range: 20 µΩ to 100 kΩ

• Dual-accuracy design: 0.5% at ultra-low values, 0.2% precision across most ranges

• 14 selectable resistance steps for advanced calibration needs

• Manganin wire coils for superior long-term stability

• High current capacity up to 250 A for micro-ohm testing

• >1 Watt power rating on all resistors

• Compatible with Kelvin Double Bridges & Micro-Ohm Meters

• Suitable for industrial, laboratory, and educational environments

• NABL verification supported (external testing charges apply)