Chapter 215Measuring Multiple SignalsComparing Signals not on the Same Screen Using Marker DeltaMeasuring Multiple SignalsComparing Signals not on the Same Screen Using Marker DeltaMeasure the frequency and amplitude difference between two signals that do not appear on the screen at one time. (This technique is useful for harmonic distortion tests when narrow span and narrow bandwidth are necessary to measure the low level harmonics.)In this procedure, the analyzer 10 MHz signal is used to measure frequency and amplitude differences between one signal on screen and one signal off screen. Delta marker is used to demonstrate this comparison.Figure 2-4Comparing One Signal on Screen with One Signal Off ScreenStep 1.Preset the analyzer:Press Preset, Factory Preset (if present).Step 2.(PSA) a. Enable the rear panel 10 MHz output:Press System, Reference, 10 MHz Out (On).b. Connect the 10 MHz OUT (SWITCHED) from the rear panel to the front panel RF input:(ESA)Connect the rear panel 10 MHz REF OUT to the front panel RF input.