The pH sensor is very noisy when connected to a SW500 interface that is connected to a laptop computer.
The high-frequency noise generated by the switching power supplies on the laptops is conducted through the ungrounded power supply of the ScienceWorkshop 500 interface. This wrecks havoc on the signal to noise ratio of the interface and sensors which require an earth ground.
Contact PASCO Scientifc technical support to receive a 540-031 power supply.
Creation Date: 09/25/2001
Last Modified: 08/29/2015