3-30 Chapter3
Functional Testing
Frequency Response
Video BW Auto Man, 3 kHz
Peak Search
FREQUENCY, Signal Track (On)
5. Adjust the synthesized sweeper amplitude for a marker amplitude
reading of –14 dBm +/– 0.10 dB.
NOTE The power level of the synthesized sweeper remains unchanged for the
duration of the test. For each new test frequency, the power sensor cal
factor should be entered to minimize measurement errors.
6. Refer to Table 3-3, “Frequency Response Report.” Enter the marker
readout amplitude for 50 MHz as displayed on the analyzer in the
Analyzer Amplitude column.
7. Enter the power meter reading in the Power Meter Amplitude
column.
8. Compute the flatness error at 50 MHz using the following equation
and record the results in the Flatness Error column:
Flatness Error = Analyzer Amplitude – Power Meter Amplitude
9. Perform the following steps for each center frequency setting listed
in Table 3-3.
a. Tune the source to the next frequency listed in the Center
Frequency column.
b. Enter the power sensor cal factor for the new test frequency.
c. Tune the analyzer center frequency by pressing the ⇑ key or press
FREQUENCY, Center Freq, “n”, and MHz (where “n” is the next test
frequency in Table 3-3).
d. Press Peak Search.
e. Enter the power meter reading in the Power Meter Amplitude
column.
f. Enter the analyzer reading in the Analyzer Amplitude column.
g. Compute the flatness error using the following equation and
record the results in the Flatness Error column:
Flatness Error = Analyzer Amplitude – Power Meter Amplitude
The flatness error should be less than the specified amount.
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