
Performance Checks 8712ET/ES and 8714ET/ES
Performance Test Software RF Network Analyzers
1-26 Service Guide
PT03: Noise Floor
This test makes transmission (ratioed) measurements to determine the noise floor for both
narrowband and broadband measurements.
Test Process.Preset the analyzer and set the power level to 0 dBm. Set the system
bandwidth to Fine (15 Hz). Set the averaging factor to 4 and enable averaging. Connect
loads to both test ports. Perform a Response and Isolation calibration. The peak value for a
given measurement trace is considered to be the level of noise floor. For ES models repeat
the test for an S12 measurement.
Repeat the test process above for a conversion loss measurement (without the Response
and Isolation calibration). This will measure the broadband noise floor.
Specification Verified.This test verifies the “Test Port Input: Noise Floor” specification
inTable1-9 starting on page1-63. (The measurement process defined above is considered
to be equivalent to the measurement process described in the specification’s footnote.)
If This Test Fails.First verify that all cable connections and screws are secure, then
perform the“Switched Gain Correction, Adjustment #102” on page 2-10.
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