Good Morning,

I have an application where I am measuring quite small voltages (I want to be able to see a change of a few millivolts). I am running the schedule I'm using for logging every 250 milliseconds and a schedule just for a mimic every second.

How do I know if bounce is a problem? The relays are going great guns and surely this must cause some disturbance. I don't have a lot of inputs to read so I can dedicate a full 4 terminal channel to each input (i.e. analog inputs 1-5 only reading 5 inputs - 1 each).

How can I get the relays to stay switched all the time? And how is this entered using the Delogger program builder? Also if for slower running schedules I want the relay switch settle time to be increased to allow a loop powered transducer to stabilize , how do I do this? Lastly I want to measure PT1000's but don't see an option in the input type list. Is there a standard Polynomial I can use?

Many many THANKS,
Chris

Good morning Chris,

All very good questions:

1. The relays take about 7 mSec to close so the closure time of the relays should not be set to less than 10 mSec. (Which is the default)

   The time between the relay closing and the channel being read can be changed with the MD channel option For example 1V(MD1000) will allow 1 second from the relay closing and the measurement being taken. In DeLogger4 typing MD20 in the options column (The very last coloumn)will give a 20 mSec delay.

2. Settling time for current loops.
   Use the MD channel option as above.

3. PT1000's
   Put the resistance value in the channel factor column.

Cheers,
Roger

Many thanks Roger,
I'm doing so much other stuff these days I've forgotten an awful lot.

Chris