Ultra precise, long term stable and robust

The resistor standard RS9010A by wekomm opens the next level of precision for the use as reference resistor, calibration standard or transfer standard. Made in Germany by wekomm to meet highest demands - Being independent from parasitic influences like temperature, humidity or ambient pressure.

Simple to use,
perfect results

The main quality claim is spelled „1 µΩ / Ω per year“ and demonstrates the excellent precision and long term stability of the wekomm resistor standard. 

The other features might shine as well:

• • the temperature coefficient is < 0,3 ppm / °C and allows an operation temperature range from 20 °C to 30 °C ambient temperature
• • no measurable influence from temperature hysteresis
• • no measurable influence from ambient pressure

Because of it’s special construction, the wekomm reference resistor does not need an oil bath. Even in non optimal or rugged environments the resistor will perfectly perform up to it’s specifications.

Perfection even in detail

According to our experience, the mechanical and electrical properties of the resistor elements only partly contribute to the excellent specifications. A lot of precision is obtained through special manufacturing processes and construction details. (You can find details in the test results of the PTB). To achieve such results, not only every components needs to be optimized. The well balanced combination of all parts makes the difference here.

For every application we have the right resistor

The resistor standards by wekomm are manufactured from selected components, which come from the finest suppliers worldwide.

The models series RS9010A offer 11 decadically staggered values ranging from  1 Ohm up to 100 MOhm.

Of course we offer on request all values in between those standard values. Even custom cases are possible (including 19 inch cases) with a variety of connectros. Made in Germany!

• • Aging/Drift: < 1 µΩ / Ω per year (independend from environmental influences)
• • temperature coefficient: < 0,3 µΩ / Ω per K
• • repeat error (hysteresis):  neglectable error 20°C to 30°C
• • wide operation range from 20°C to 30°C
• • no special requirements regarding temperature

• • mechanically insensitive and completely immune to ambient pressure changes
• • No oil bath required
• • custom versions possible
• • standard size: W 10 x H 10 x D 11.5cm
• • weight: ca. 1.5 kg
• • Made in Germany