For the benefit of others interested in similar applications, it is possible to use a PicoScope 2203 to do the above in conjunction with the PicoLog software.
You will require a voltage attenuator and a current clamp for the device you are measuring.
To setup PicoLog recorder to measure the voltage and current:
- Within PicoLog Recorder, click File -> New Settings
- Configure your recording method and sampling rate
- Once the software has detected your PicoScope 2203, click OK.
- When the PicoScope 2000 Measurements dialog appears, click 'Add...'
- Setup Channel A for Voltage, applying any scaling if necessary
- Setup Channel B for current - set the channel name, then click 'Options...' to set parameter formatting and scaling for graphs.
- Click the 'Scaling' button and apply any scaling that you require for the current clamp (it will provide readings in millivolts which requires conversion). See also the attached screenshots.
- You now have the option to create a Calculated Parameter to show the Power as the data is captured, or capture the data and process it afterwards to calculate Power in Watts and Watt hours.
- To create a Calculated Parameter, click Settings -> Calculated Parameters in the PLW Recorder window
- Click 'Add', then set the name and select the Input Parameters. The equation should be A * B (see the attached screenshot)
- Click 'Options...' to set Units, and max/min values. Click 'OK', then 'OK' again.
- Capture the data.
- When complete, click the Spreadsheet icon - you can copy these values into Excel.
- In the PLW Spreadsheet window, click the 'Tick' icon.
- In the Spreadsheet Options dialog (see attached spreadsheet), click the 'Show individual readings' box then select the 'Average' tick box. If capturing data at 1 second intervals, enter 3600 in the time interval per row or 60 for 1 minute intervals to give you Watt-hours.