Keysight E4981A Programming Manual page 109

Measurement Applications (Sample Programs)
Executing Multi Correction
'===================================
' ErrorProc
'===================================
ErrorHandler:
' Display the error message
MsgBox "*** Error: " + Error$, MB_ICON_EXCLAMATION
End
End Sub
Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 109