Andrew
I thought something to do with 0V potential could be causing this. I am going to try a Desktop PC to see if that works any better as its 0V is usually connected to chassis (or almost chassis potential)
Many thanks for your help.
KR
Dave B

I have a problem which is a bit odd with my TC-08 Temperature Logger. I want to measure a voltage in mV on Channel 1 and measure Temperature on Channel 2. I have connected up a potential divider on channel 1 which consists of a 1K resistor across the two pins and a 100K resistor in series with the v...