Electronics International MVP-50P - Manual (Page 68)

“REF” - If the reference for any function has a problem or a derived value used to calculate the function
has a problem, the display for the function will show “REF.”
Error Box (Compact Flash Error Message) - If the MVP detects a problem with the compact flash,
an Error Box will be displayed.
Error Box (Dead Battery Error Message) - If the internal battery dies, an Error Box will be dis-
played.
Other - Other error messages are self explanatory.