- Resistance from 1 mΩ to 10 MΩ
- Power Rating : 225 W/decade, 250 W max. or higher (Contact IET for Custom Higher Power Units)
- Accuracy: 0.5% or 1%
- Voltage Rating: 1000 V or higher
- Special and custom configurations available
The High-Power Decade Resistance Substituter (HPRS) Series is a family of resistance decade boxes offering a broad choice of high-power, excellent-performance resistance sources.
The HPRS Series resistance decade boxes employ state-of-the-art precision resistors of various types for high accuracy, high stability, and low temperature and power coefficients of- resistance. High-power resistors within the unit are made available without sacrificing other electrical properties.
The standard models offer a choice of 3 to 8 decades. The panels are clearly labeled showing the step size and maximum voltage and current limitations for each decade.
With a resolution as low as 1 mΩ and a maximum resistance of 10 MΩ , the HPRS resistance decade box may be used as a general purpose substituter as well as a high power load for testing power supplies and for other high-power applications.
Applications include calibration of meters and instruments. HPRS resistance decade boxes are useful development tools wherever precise resistances with high-power handling capacity are required.
Accuracy:
Option F: ±(1% + 20 mΩ)
Option C: ±(0.5% + 20 mΩ)
Zero Resistance: <5 mΩ per decade
Maximum Voltage to Case: 1000 V peak Switches:
Continuous rotation 10 positions marked "0"-"9"
Resistance per step | Total decade resistance | Max current* | Max power per step* (W) | Temperature coefficient (ppm/°C) | Resistor Type |
1 mΩ | 0.009 Ω | 8 A | 0.036 | ±50 | Resistance Wire |
10 mΩ | 0.09 Ω | 6 A | 0.36 | ±50 | |
100 mΩ | 0.9 Ω | 6 A | 3.6 | ±20 | |
1 Ω | 9 Ω | 5 A | 25 | -20 to +80 | Power Film |
10 Ω | 90 Ω | 1.5 A | 25 | -20 to +80 | |
100 Ω | 900 Ω | 0.5 A | 25 | -20 to +80 | |
1 kΩ | 9 kΩ | 150 mA† | 25† | -20 to +80 | |
10 kΩ | 90 kΩ | 50 mA† | 25† | -20 to +80 | |
100 kΩ | 900 kΩ | V limit† | V limit† | -20 to +80 | Wirewound/metal film |
1 MΩ | 9 MΩ | V limit† | V limit† | ±50 | Wirewound/film |
*Subject to maximum of 250 W max. per unit: 9 Steps per decade, multiply the decade value by the power per step. Multiple decades can be used to share power loads | |||||
†Subject to 1000 V (dc+ac) peak max | |||||
