High Load Reference Resistors

Worlds best


When dealing with metrology tasks, you could usually have to chose between precision or high load capability. We have combined both. Now you can get precision and high load capability built into one single resistor. The high load precision resistors made by wekomm put electrical measurements to a whole new level.

World wide you will find no other resistor with these excellen specifications combined.

Hochlast-Referenzwiderstand
Hochlast-Referenzwiderstand

New solutions for new challenges


To achieve the unrivaled precision level and temperature behavior, we need to apply a very careful and tedious component selection during the manufacturing process. Most important are two main components: A massive cooling system mitigates thermal load and two extremely precise temperature sensors allow the user to be informed about even the slightest temperature change inside the resistor. 

When those temperature values are taken in account, the measurement precision can be increased by the factor five!

All this will enable you to make the most precise current measurements. For application notes please contact us.

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Nothing is impossible


Our continuous development and analysis of thousands of measurements have us enabled to produce a new type of resistor, basically stretching the physical limits. A long term stability of typ. < 3 ppm per year and a temperature coefficient of typ. better than 1ppm are the basic parameters of this resistor.

This resistors comes to shine when some load is applied. The deviation of the value at 1W load (that is 1A for a 1Ohms resistor!) is typically lower than 0.8ppm. That is some unrivaled performance for high load resistors. 

Yet, those resistors are as robust, error tolerant and easy to use as all models of our precision series RS9010A.

Automatic Resistance Bridge
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Laborleiter am Mikroskop

Every piece is unique


As manufacturing of those resistors is a real challenge and time consuming, we manufacture those resistors only on request by order. So tell us, what you need - we will make it happen.

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Laborleiter für eine Messung durch

Current and Resistor


Metrology Institutes, Cal Labs and specialized Metrology Labs in the industry are using our High Load High Precision Resistors for measuring current and -resistors.


Here you can find two application samples:


  • Calibrating DVM current measurements between 100 mA and 1 A
  • Increasing the measurement resolution with current comparators.

Typical product specifications

model

nominal value
Ω

value accuracy nominal µΩ/Ω

temperature coefficient
µΩ/Ω per K

stability

µΩ/Ω per year

maximum voltage (Volt)

RS9020A-1 

RS9010A-10

RS9010A-100

20

20

20

1Ω

10Ω

100Ω

< 1

< 1

< 1

1

1

1

1 V

3V

10V

1 A

300mA

100mA

maximum current (mA)

  • mechanically insensitive and completely immune to ambient pressure changes
  • No oil bath required
  • custom versions possible
  • Standard size: W 16 x H 10 x D 11,5cm
  • Weight: ca. 4,5 kg
  • Made in Germany
  • Aging/Drift: < 1 µΩ / Ω per year (independend from environmental influences)
  • Temperature coefficient: < 0,3 µΩ / Ω pro K
  • repeating error (hysteresis): 30°C – neglectible within 20°C to 30°C
  • wide operation range from  20°C to 30°C
  • no special requirements regarding temperature

For more information get the datasheet here

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Accessories


For optimum protection while transporting we recommend our transportation box for two resistors.


Additional accessories are low thermal cables in two variants:


2-wire

4-wire

Optimal, geschützer Transportkoffer
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Resistance Standard

Where to buy


For all inquiries or order please contact us directly or one of our distributors. You will find the relevant information here. We are looking forward hearing from you.

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