We are using an 34970A/34901A unit with BenchLink Datalogger 3 to simultaneously track several temperature readings. When we hook-up just five thermistors, we get reasonable readings. When we add a sixth thermistor, our hot water temperature readings jump by 10-15C and our room temperature readings jump by 20-25C. We have substituted other thermistors for the sixth thermistor and we still get this phenomena.
Is five the limit for two-wire, 10K thermistors? Are the channels we are using having an effect? For six thermistors we use channels 209, 211, 213, 215, 217 and 219. For five thermistors, we omit channel 219.