HP 8591C User Manual page 190

Channel Measurements Menu Map and Softkey Descriptions
Channel Measurements Softkey Function Descriptions
START 64.8 STOP 425.8
YRES BW 5.8 MHz RT
Figure 5-12. Conditioned Reference Spectrum
memory. See the SAVE TRB TO INT function for more information about
saving trace B. Wait until the message TRACE B SAVED appears before
proceeding. See Figure 5-13.
5. With a reference trace displayed on the analyzer press DO FRq RESP TST
to begin the actual comparison test between the reference and the signals
under test. Refer to the section entitled "DO FRQ RESP TST" for more
information.
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