Keysight N1911A Programming Manual page 160

2 MEASurement Commands
Example
READ:RAT:REL?
Error Messages
– INITiate:CONTinuous must be set to OFF on both channels, otherwise error
– If TRIGger:SOURce is set to BUS or HOLD on either channel, error –214, "Trigger
– If the resolution parameter is not the same as the current resolution setting on
160
–213, "INIT ignored" occurs.
deadlock" occurs.
the specified window, error –221, "Settings conflict" occurs.
N1911A/1912A P-Series Power Meters Programming Guide
This command queries the relative ratio
measurement on the upper window/upper
measurement.