The SUM command gives the sum of the trace amplitudes in measurement units. SUM must be used as either a query or as a source in another analyzer-command function. Form a query by ending the SUM statement with a question mark (?). When used as a query, SUM queries the sum of the trace amplitudes to the computer. Use SUM as a source by incorporating the SUM statement into the source of any spectrum-analyzer command having predened function in its syntax diagram. When SUM is used as a source, the sum of the trace amplitudes is used for operation by the command that contains SUM. When the source is TRA, TRB, TRC, or trace range, ensure the data reects one complete sweep using the SNGLS and TS commands.
