deno

05-14-2006, 08:11 PM

Hello, I seem to be having a problem with measuring low values of resistance on a water tank sender using RCTIME.· This sender will vary between 33 ohms and 240 ohms, depending if full or empty.· Sample time can be up to 1 minute, so there is plenty of time to charge the capacitor.·

Have any of you fellow "Stampers" been sucessful in measuring low values of resistance using the RCTIME command.· I have tried several values of capacitance and I seem to get:

········· 1. wandering readings that slowly increase or decrease.

··········2. a reading for the 33 ohm value but a value of 1 for the 240 ohm.

·········

When I do the math on paper...the formulas used in the "HELP" section of RCTIME, it works out to the proper units of time (depending on which stamp I use).· I am thinking it would be better to use a BS2 stamp, to keep the units of time below the value of a WORD varaible (65536).

Any thoughts on this?

Deno

Have any of you fellow "Stampers" been sucessful in measuring low values of resistance using the RCTIME command.· I have tried several values of capacitance and I seem to get:

········· 1. wandering readings that slowly increase or decrease.

··········2. a reading for the 33 ohm value but a value of 1 for the 240 ohm.

·········

When I do the math on paper...the formulas used in the "HELP" section of RCTIME, it works out to the proper units of time (depending on which stamp I use).· I am thinking it would be better to use a BS2 stamp, to keep the units of time below the value of a WORD varaible (65536).

Any thoughts on this?

Deno