Agilent Technologies 85032B/E 50 Specifiche Pagina 42

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Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
1-34 Service Guide
PT10: Trace Noise
This test checks trace noise magnitude on narrowband and broadband transmission
measurements. The measurement trace is normalized to remove the effects of frequency
response on the baseline. The marker statistics for standard deviation (SDev) are
considered to be equivalent to an RMS calculation.
Test Process.Connect a through cable. Preset the analyzer and set the power level to
0dBm. Set the system bandwidth to narrow (250 Hz). Set the averaging factor to 8 and
enable averaging. Normalize the trace, then turn off the averaging. Position marker 1 at
the beginning of the trace and position marker 2 at the end of the trace. Use the marker
math statistics feature to display the SDev value. SDev is equal to the RMS value of the
trace noise.
Repeat this test for a conversion loss measurement, and set the start frequency to 10 MHz.
For ES models, repeat this test for a reverse transmission (S12) measurement.
Specification Verified.This test verifies the “Test Port Input: Trace Noise” specification
inTable1-9 starting on page1-63.
If This Test Fails.When this test fails by less than 1/2 the specified value, try using an
averaging factor of 16 or 32. Almost anything within the entire analyzer system can
contribute to excessive trace noise. The most likely assemblies to fail are the A5, A4, and
A3, in that order. If trace noise can be isolated to only one input (A, B or R), then the
problem is most likely in the A5 receiver assembly. Otherwise, suspect A4 or A3.
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