Agilent Technologies 85032B/E 50 Specifiche Scaricare il pdf (Pagina 37)

8712ET/ES and 8714ET/ES Performance Checks

RF Network Analyzers Performance Test Software

Service Guide 1-29

PT06: Absolute Power Accuracy

This test veriﬁes the accuracy of the B* broadband detector from the maximum input level

of +16dBm down to the speciﬁed noise ﬂoor. The test is designed to be performed at

30MHz, however 15 MHz may be used if the frequency range of the signal source does not

extend to 30 MHz. The 8116A is the preferred signal source, however the 33120A may be

used as an alternative. An external 110 dB step attenuator is used to vary the test signal

over the power range to be tested.

Test Process.Connect the step attenuator to the output of the signal generator. Set the

frequency to 30 MHz (preferred) or 15 MHz. Connect a 6 dB pad to the output of the step

attenuator. For 75Ω analyzers, use a minimum loss pad in place of the 6 dB attenuator.

Calibrate the power meter and use it to measure the output from the 6 dB pad. Set the

step attenuator to 0 dB. Adjust the output from the signal generator so that the power

output from the 6 dB pad is +16.0 dBm. Record the exact reading. Use calibration data

from the power sensor to compensate for the frequency difference between the power

meter calibration and the signal generator. Disconnect the power sensor and connect the

6dB pad to the RF IN/PORT 2 test port on the analyzer. Set the system bandwidth to

narrow (250 Hz). Repeat the previously used steps for the signal generator output, and

record the readings on B*. Switch the step attenuator as necessary to provide levels from

+16 dBm to−44 dBm to the analyzer. Record the B* reading for each level and correct the

readings using the calibration data for the step attenuator. Averaging may be used as

needed. Each power reading on B* must meet the speciﬁed accuracy until the noise ﬂoor is

reached.

Speciﬁcation Veriﬁed.This test veriﬁes the “Test Port Input: Power Accuracy”

characteristic inTable1-9 starting on page1-63. In some cases, it may be performed at 15

MHz instead of the speciﬁed 30 MHz.

If This Test Fails.If you are using a programmable attenuator, ﬁrst verify that the

correct 40 dB section of the step attenuator is being used. See“The step attenuator's 40 dB

card selection (3)” on page 1-17. If the correct attenuator is being used, perform the“B*

Amplitude Correction, Adjustment #110” on page 2-21.

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Agilent Technologies 85032B/E 50 Specifiche Pagina 37