Tracking-Generator Output Power Activated; Spectrum Analyzer Settings According To The Measurement Requirement - HP 8590 E-Series User Manual

Figure 4-5. Tracking-Generator Output Power Activated
4. Put the sweep time of the analyzer into stimulus-response auto-coupled mode by pressing
More 1 of 2 , then SWP CPLG SR SA until SR (stimulus-response mode) is underlined.
Auto-coupled sweep times are usually much faster for swept-response measurements than
they are for spectrum analyzer measurements.
Note
In the stimulus-response mode, the Q (reactance versus resistance) of the
DUT can determine the fastest rate at which the spectrum analyzer can be
swept. To determine whether the analyzer is sweeping too fast, slow the
sweep time and note whether there is a frequency or amplitude shift of the
trace. Continue to slow the sweep time until there is no longer a frequency or
amplitude shift.
5. Since we are only interested in the rejection of the low-pass filter, tune the spectrum
analyzer center frequency so that the roll-off of the filter comprises the majority of the trace
on the display (see Figure 4-6).
Figure 4-6. Spectrum Analyzer Settings According to the Measurement Requirement
PEAK PEAK
LOG LOG
W A SB W A SB
S C FC S C FC
C E N T E R 900 MHZ
0 dBm
PEAK PEAK
LOG LOG
C E N T E R 4 4 3 6 M H Z
S P A N 1 S P A N 1 800 GHr
2 0 msec
S P A N 5 0 6 1 . 0 MHz
Making Measurements 4-9