Agilent Technologies 85032B/E 50 Specifiche Pagina 32

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Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
1-24 Service Guide
PT01: Frequency Accuracy
This test measures the frequency accuracy of the output of the analyzer.
Test Process.Set the analyzer to several CW frequencies while in trigger-hold mode.
Connect a frequency measuring device to the output of the analyzer. The device used to
measure the frequency can either be a frequency counter or a spectrum analyzer with a
high degree of frequency accuracy. If the network analyzer under test has Option 1EC
(75 system impedance and connectors) a minimum loss pad will be required in order to
connect a 50 frequency counter or spectrum analyzer.
Specification Verified.This test verifies the “Test Port Output: CW Accuracy”
specification inTable1-8 starting on page1-57.
If This Test Fails.Failures of this test are rare. If this test should fail by a small amount,
adjust the reference crystal oscillator by performing theFrequency Accuracy Adjustment”
on page 2-5. If it fails by a significant amount, and the A3 fractional-N/reference
assembly's 10 MHz reference output is accurate, suspect excessive noise on the RF output
of the source.
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