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Performance Checks 8712ET/ES and 8714ET/ES

Performance Test Software RF Network Analyzers

1-28 Service Guide

PT05: Power Flatness

This test checks the maximum variation in output power across the frequency range of the

analyzer.

Test Process.Connect a calibrated power sensor to the RF OUT/PORT 1 test port.

Determine the power levels to test:

1.Refer to “Test Port Output: Power Sweep Ranges” inTable1-8 starting on page1-57.

2.Find the entry for the model and option conﬁguration of the analyzer under test.

3.In the “Attn = 0 dB” column of the table, the power sweep range is deﬁned in the form

“ntoPmax”. Usen as one power level to measure, use Pmax as another power level to

measure, and use the midpoint between the two as the third power level to measure.

4.If the analyzer under test is an ET model with Option 1E1, or an ES model, then also

use a midpoint power level from each of the following three columns: “Attn = 10 dB”,

“Attn = 20 dB” and “Attn = 30 dB”.

5.For each separate power level, record the reading on the power meter at 27 different

frequencies, across the frequency range of the analyzer. Correct the power readings

using the frequency ﬂatness data for the power sensor. The difference between the max

and min values for the 27 readings should be within the speciﬁed ﬂatness limit as

stated in “Test Port Output: Level Accuracy inTable1-8 starting on page1-57. Note

that the speciﬁcations are listed in the form of±n dB. This equates to an allowable 2n

variation (max−min). Measurement of power levels below−30 dBm are outside the

speciﬁed range of the power sensor and should not be included in the test.

6.For ES models, make the same set of measurements in the reverse transmission

direction (S12) with the power sensor connected to PORT 2.

NOTE Be sure to zero the power meter before making any series of measurements

below−19 dBm.

A second test is performed by the test software to check for obvious power level

inconsistencies that might not be detected by the speciﬁcation check. It is a precaution to

ensure that no power holes (drop-outs) exist. A through cable is connected and the

analyzer is swept from 10 MHz to its high-end frequency using 1601 points per sweep. The

resulting B* trace is checked for any signiﬁcant power holes that could have been missed

during the previous section of this test. For all ES models and for ET models with

Option1E1, repeat the full-sweep test for the three power levels tested in step 4 above.

When power holes are detected by this test, it is considered to be a failure of the

speciﬁcation.

Speciﬁcation Veriﬁed.This test veriﬁes the “Test Port Output: Level Accuracy”

speciﬁcation inTable1-8 starting on page1-57. Notice that values for 75Ω instruments

above 2GHz are nonwarranted characteristics,not warranted speciﬁcations.

If This Test Fails.Repeat the test, verifying that all connections are secure. If the test

still fails, perform the“Source Power Correction, Adjustment #104” on page 2-15.

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Agilent Technologies 85032B/E 50 Specifiche Pagina 36