Phone: 253-927-6186
 Email: sales@hotektech.com
HOME
CONTACT US
Home > Standards > Resistance Decades > RS925D Decade Resistance Substituter

RS925D Decade Resistance Standard. RS925D Decade Resistance Standard is a four-terminal,
continuously variable resistance standard. Values from 10mΩ to 1.2MΩ can be achieved using eight decade switches.
The rheostat offers a resolution of 20mΩ. Use of Evanohm, wire-wound precision resistors provide an
accurate, stable standard with good temperature characteristics.
The Model RS925D can be used as a standalone resistance standard or in conjunction with the
Models 801B/801C, and 240C to complete a 242D or 242E Resistance Measurement System.

RS925D Decade Resistance Standard.

Model  Description 
 RS925D RS925D Decade Resistance Standard.

High accuracy - 20 ppm + 0.5 mΩ

High stability - 20 ppm + 0.5 mΩ

Resistance from 10 mΩ to 1.1 MΩ

20 µΩ resolution  

20 µΩ resolution In order to eliminate contact resistance and thermal emf, the RS925D integrates a
rheostat. As a result, voltage and contact resistance effects are removed by being effectively added to
the input impedance of the measuring instrument.
Low temperature coefficient - as low as 3 ppm/°C.
High performance solid silver contact switches
Hermetically sealed, low inductance resistors.
Precise fixed minimum resistance.
The first 4 decades can be individually trimmed for increase accuracy.

 

RS925D Decade Resistance Substituter.
Resistance per step Total decade resistance Max current  Max power  Temperature
coefficient(ppm/C) 
Power coefficient(ppm/mW) 
20 µΩ Rheostat  10 mΩ  2A  NA  20 
10 mΩ  100 mΩ  2A NA 20 1
100 mΩ  1 Ω  2A NA 20 1
1 Ω  10 Ω  1A 5 W 20 0.4
10 Ω  100 Ω  0.33 A 5 W 10 0.3
100 Ω  1 kΩ  0.1 A 5 W 3 0.1
1 kΩ  10 kΩ  33 mA 5 W 3 0.1
10 kΩ  100 kΩ  10 mA 5 W 3 0.1
100 kΩ  1 MΩ  3 mA 2000 V
peak 
3 0.1
Wiring and
switch
resistance 
NA 50 μΩ/C  0.2 μΩ/W  NA