I have just received an I2C Adapter Phidget (SKU: ADP0001_0). After opening the Phidget Control Panel, I set the configuration voltage to 5 V. I then connected the ground probe of my multimeter to the GND pin on the ADP0001 and the positive probe to VCC. The measured voltage was 6.87 V.
When I changed the configuration voltage to 3.3 V, the multimeter read 4.53 V. When set to 2.5 V, the measured voltage was 3.45 V.
Are these measurements expected, or could this indicate a configuration or hardware issue?
Those measurements are definitely off the expected value. The device should output the selected voltage within 0.1V, and is tested for this in production. So there is something wrong, either with the board itself or how you're measuring it.
The board is isolated, meaning measurements of anything on the terminal blocks would be incorrect if measured from a reference point other than the GND terminal on the device. The ground on the VINT or USB connector would not work as a reference point. It sounds like you are using the terminal block GND though, so that's good.
A few questions to start:
Is there anything currently connected to the ADP0001 (i.e., an I2C device)? If so, remove it and retake the measurements.
Are you using VINT or USB?
What language are you using? Not relevant using the control panel
Are you setting this through the control panel example or custom code? never mind, I see you mentioned using the control panel.
Have you tested your multimeter with known voltages to ensure it is working correctly? (I have to ask)
