Isaohm
Isaohm is a brand name of Isabellenhütte Heusler for a resistance alloy with high-quality properties for the production of precision, e.g. measuring resistors . It consists mainly of nickel and chromium with additives of aluminum , silicon , manganese and iron . It is characterized by a particularly high specific resistance , low temperature coefficient of electrical resistance and low thermal voltage compared to copper .
Important dates are:
| property | default | Special | unit |
|---|---|---|---|
| Specific resistance in 20… 250 ° C |
1.32 | μΩ m or Ω mm 2 / m |
|
| its temperature coefficient in 20… 105 ° C |
−50 ... + 50 | ± 10, ± 3 | 10 −6 / K |
| like in 20 ... 60 ° C | up to ± 1 | 10 −6 / K | |
| Thermoelectric voltage to copper | + 1.0 | + 1.0 | μV / K |
The extremely small temperature coefficient (TK) of the resistance results from the fact that the typical metals TK positive at about 40 ° C merges into a negative TC, so that in the curve on a flat maximum is formed.
The material is preferably produced as a wire with a diameter of 0.01 to 0.6 mm. A resistance coverage of approx. 5 Ω / m to 15 kΩ / m can thus be achieved as standard . Isaohm is good for welding and hard soldering, and under certain conditions also soft soldering. When used for high-precision resistors, the maximum application temperature in air is 250 ° C. The properties can be irreversibly affected at higher temperatures.
Web links
- Manufacturer and brand owner: Isabellenhütte Heusler GmbH & Co. KG in Dillenburg (data sheets etc.)