Agilent Technologies 85032B/E 50 Specifiche Pagina 39

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8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performance Test Software
Service Guide 1-31
PT08: Directivity
This test checks directivity, source match, and load match. The uncorrected (raw)
directivity and source match values are derived from the measurement calibration arrays.
Load match is checked using a calibration performed at the end of a through cable.
These tests require an 85032B calibration kit (standard or Option 001) for a 50 analyzer,
or an 85036B calibration kit for a 75 analyzer. The standard economy (E) versions of
these kits do not provide the necessary components to perform these procedures.
NOTE The three tests described below assume that an ES model is operating in the
forward (S21) direction. These tests should be repeated for the reverse
direction (S12) on ES model analyzers.
Test Process for Directivity.Preset the analyzer and set the power level to 0 dBm.
Measure reflection on channel 1. Perform a “1-port” calibration on ET models, or a “user
1-port” calibration on ES models. Leave the load attached. Disable measurement
calibration by pressing the following keys
(OFF should be in caps). Access
the reflection tracking array, press . Combine the
traces by pressing . The resulting trace should be completely
below the values for the specification (not the typical).
Test Process for Source Match.(These instructions assume that the directivity test has
been completed and that the calibration is still valid.) Access the source match array. To
meet the specification, the trace must be below the limit indicated in the specification (not
the typical). For example, if the specification for 300 kHz to 1.3 GHz is 18 dB, the trace
must be below18 dB for that frequency range.
Test Process for Load Match.Preset the analyzer. Connect a type-N cable to the
RFOUT/PORT 1 test port. Perform a 1-port calibration at the free end of the cable. Be
sure to specify a male calibration kit (“Type-N (m)”). Note that during the open portion of
the calibration, the extender pin must be placed over the center conductor of the cable.
Connect the cable to RF IN/PORT 2. The reflection trace must be below the limits given in
the load match specification (not the typical).
Specifications Verified.These tests verify performance of the following items in the
“System Performance, Uncorrected” category ofTable1-6on page1-55 andTable1-7on
page1-56:
Directivity
Source Match (ratio)
Load Match
SYSTEM OPTIONS
Service
Service Utilities Meas Cal Options Meas Cal
View Array Master Tracking
DISPLAY
Data/Mem
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