98 Keysight E8402A, E8404A C-Size Mainframes User and Service GuideProgramming the Enhanced Monitor HISTory SubsystemHISTory:UNIT[:TIME] <unit>HISTory:UNIT[:TIME]?HISTory:UNIT[:TIME] sets the time units that will be used to reporthistorical data with histograms and history events.HISTory:UNIT[:TIME]? returns a string (enumerated) of the time units that areused to report historical data with histograms and history events. The stringsreturned are: HOUR, MIN, SEC.ParametersReturned DataComments– Use of this command does not change the amount and resolution of thedata kept by the enhanced monitor’s HISTory subsystem. It simplychanges the reporting of that data. When set to hours it reports the data tothe nearest hour, and so on.– The setting is stored in non-volatile memory with the SYSTem:NVSavecommand.Error ConditionsThe following table lists the most common error conditions and causes. Errornumbers and corresponding messages can be found using SYSTem:ERRor?query.Reset Condition*RST sets units back to the last value saved with the SYSTem:NVSave command.Name Type Range Default Description<unit> enum. HOUR,MINute,SECondHOUR Selects the time unit used within theHISTory subsystem.Type Range Descriptionenum. HOUR, MIN, SEC Time units for reporting historical data.Number Message Probable Cause-109 “Missing parameter” The parameter was omitted.-224 “Illegal Parameter” The parameter was not correct.
