Passive Sweep - ADInstruments S7200 Operation Manual

AD INSTRUMENTS S7200 TV Signal Analyzer Operation Manual

6.1.5. Passive Sweep

A stored passive sweep trace can be considered as a reference trace, up to 8 trace
records can be saved as reference traces at one time in the unit. This feature is
primarily used when an active sweep reference generator is not used at the HE or
hub. After saving a reference trace, (it will show at the top of the screen) it can be
compared to a live trace downstream from the different location where the live
trace is being measured.
The Figure 6-7 is a comparison of optical receiver RF output port and test port
output signal level. The amplitude read by the marker is the differentials of the
two traces.
Figure 6-7 Passive Sweep
The Figure 6-8 shows the passive sweep detailed operation steps. First connect
the S7200 initiate a channel sweep measurement at the optical receiver test port,
and store the trace measurement result as reference trace. Then connect the
S7200 at the RF output port of optical reciever, and initiate a second channel
sweep measurement. Compare the measurement signal with the saved signal. We
could see that the differential value is 19.6dB, which indicates that the signal
attenuated 19.6dB, including attenuation for the test port, connector attenuation
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