I have some 1000 ohm Resistance Temperature Devices.

My input board only accepts 100 ohm RTDs.

Is there a passive component that could "step down" that signal ?

 

I guess you could put 111 ohm precise low tempco resistor in parallel.

 

I guess you could put 111 ohm precise low tempco resistor in parallel.

You could put 10 (1000 ohm parts) in parallel to get 100 ohms.

 

I have some 1000 ohm Resistance Temperature Devices.

My input board only accepts 100 ohm RTDs.

Is there a passive component that could "step down" that signal ?

No.

 

I guess you could put 111 ohm precise low tempco resistor in parallel.

The problem with that approach is that the parallel combination has only 1/10th the sensitivity of an actual 100Ω RTD. Instead of the normal 3850 ppm/°C it would have only 385 ppm/°C.

Designing signal conditioning circuits for RTDs is already a non-trivial task for all but the most crude, non-demanding applications. Reducing the RTD's sensitivity tenfold would make achieving any useful level of accuracy and stability a MAJOR challenge.

 

What input board do you have?