- Low zero-resistance: <5 mΩ per decade for HARS-B
- High-performance solid silver-alloy contacts
- Low temperature coefficient: - 5 ppm/°C
- Non-inductive or low-inductance resistors
- Rack mounting available
The HARS Series is the best choice when you need a laboratory grade, tight tolerance, high performance resistance decade box that is also cost effective.
The High-Accuracy Resistance Substituter (HARS) resistance decade box is a family of instruments providing a very broad choice of high performance resistance sources. With a resolution as low as 1 mΩ and a maximum available resistance of over 111 MΩ, the HARS series resistance decade boxes may be used for exacting precision measurement applications requiring high accuracy, good stability, and low zero-resistance. Any number of decades from one to eleven is available in a choice of accuracies.
The HARS resistance decade box is a precision resistance source with excellent characteristics of stability, temperature coefficient, power coefficient, and frequency response. The HARS Series employs very-low-resistance switches with silver alloy contacts. A special design keeps zero resistance to less than 1 mΩ per decade for the HARS-X. Self cleaning keeps the silver contacts from becoming tarnished when unused, or when only low currents are passed through them. This is most often the case when only minute test currents are drawn by digital multimeters or other test instruments. Contact resistance is stable and remains low and repeatable.
The HARS resistance decade boxes have high-quality gold-plated tellurium-copper binding posts serve to minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements. All other conductors within the resistance decade box, as well as the solder employed, contain no metals or junctions that could contribute to thermal emf problems.
HARS Resistance Decade Box Applications
- *Can be used as components of dc and ac bridges
- *Excellent choice as a resistance calibration or transfer standard
- *As a precision RTD simulator.
- *The HARS Series decade box may be rack-mounted to serve as components in measurement and control systems
Spécifications de base de la série de décades à résistance HARS-B Series
Précision : (0,1% + 4 mΩ)
Résistance Zéro : <5 mΩ par décennie à cc
Tension maximale au boîtier: commutateurs de crête 1000 V:
Rotation continue 10 positions marquées "0" - "9" Contacts multiples en alliage d'argent massif
Résistances: Combinaison de fil de fer, de film métallique et de fil de résistance.
Résistance par pas | Résistance totale à la décennie | Stabilité (± ppm / an) | Stabilité à long terme (± ppm / 3 ans) | Coefficient de température (± ppm / ° C) | Type de résistance | HARS-X | HARS-X2 | ||||
Max courant | Tension max (par étape) | Puissance maximale (par pas) | Max courant | Tension max (par étape) | Puissance maximale (par pas) | ||||||
1 mΩ | 10 mΩ | 50 | 75 | 50 | Fil de résistance | 8 A | 5 mV | 0,04 W | 9: A | 9 mV | 0,08 W |
10 mΩ | 100 mΩ | 50 | 75 | 20 | 4 a | 40 mV | 0,16 W | 6,3 A | 63 mV | 0.4 W | |
100 mΩ | 1 Ω | 50 | 75 | 20 | 1.6 A | 0,16 V | 0,25 W | 2.2 A | 0.3 V | 0.5 W | |
1 Ω | 10 Ω | 20 | 25 | 20 | Bobiné, non inductif | 0.8 A | 0,8 V | 0,6 W | 1.1 A | 1,1 V | 1,2 W |
10 Ω | 100 Ω | 20 | 25 | 15 | 0,25 A | 2,5 V | 0,6 W | 0.35 A | 3,5 V | 1,2 W | |
100 Ω | 1 kΩ | 20 | 25 | 5 | 80 mA | 8 V | 0,6 W | 110 mA | 11 V | 1,2 W | |
1 kΩ | 10 kΩ | 20 | 25 | 5 | 23 mA | 23 V | 0.5 W | 35 mA | 35 V | 1,2 W | |
10 kΩ | 100 kΩ | 20 | 25 | 5 | 7 mA | 70 V | 0.5 W | 11 mA | 110 V | 1,2 W | |
100 kΩ | 1 MΩ | 20 | 25 | 5 | 2,3 mA * | 230 V * | 0,5 W * | 3 mA * | 500 V * | 1 W * | |
1 MΩ | 10 MΩ | 20 | 25 | 5 | 0,7 mA * | 700 V * | 0,5 W * | 1 mA * | 1000 V * | 1 W * | |
10 MΩ | 100 MΩ | 50 | 100 | dix | Film d'oxyde métallique | 0,1 mA * | 1000 V * | 0,1 W * | 0,1 mA * | 1000 V * | 0,1 W * |
* Sujet à un maximum de 2000 V au cas par cas. |