Picolog seems to have the following display problem, which I found while operating the DrDAQ, but suspect it as an obvious software problem.
When measuring two or more quantities having, at one stage, the same value or values very near to each other and it is desired to display these quantities with the SEPARATE GRAPHS option, once the values become nearly identical or identical, only one plot remains, while the other plots become empty and their scale factor changes to a wrong value. With two quantities, one display disappears, with three, two disappear and so on. The only remedy seems to be, in this case, that of displaying all quantities IN THE SAME GRAPH. Unfortunately then, if other quantities, with great difference in value, have to be displayed, the resulting display is far from satisfactory.....
Herewith enclosed PLW file Barometer 1800a. that shows the described display phenomenon. Data collected with USB DrDAQ where the EXT. inputs were used, but all data is available from the PLW file.
I will report a bug although given that the software is under maintenance, a fix might be unlikely unless it is deemed to be a significant issue by our Development Team.
You may wish to consider using the PicoScope 6 software if you are going to be capturing data for short periods of time.
Update: If you choose to use PicoScope 6, you can make use of Maths Channels or Custom Probes to make calculations and use the Alarms feature to save data to disk when a capture has occurred or the waveform buffers are full.
Update 2: After investigation, it appears that the scaling for the calculated parameters for your Barograph 3 and Barograph 1 parameters might not be correct. First correct the scaling:
Close the graph
Click Settings -> Calculated Parameters
Select the parameter from the list
Click Edit
Click Options
Adjust the Scaling for graphs minimum and maximum value
Accept changes
Open the graph view again
Save the data file with another name to retain settings.
Click on the little '+' in the top left corner of the graph and adjust the vertical axis. To apply the changes click the '-' icon that appears in place:
Graph view
You can also use the magnifying buttons at the top of the window for vertical zoom or the up down to keep the zoom level the same but shift the vertical position upwards or downwards.