Hi Barber,
If the attribute is already a string, then you just have to specify it with a string dummy in the "Get Waveform Attribute" function.
The attribute that is used for the plot name is called "NI_ChannelName". When saving a text for this attribute, the text will show up as the plot name in a graph. Please try the attached "Attribute.vi".
Best regards,
Philip C.
National Instruments
- Philip Courtois, Thinkbot Solutions