Agilent Technologies S GSM, 8922M manual Understanding the Tests

Verifying Performance

Understanding the Tests

Test 04: Signal	Equipment Required (excluding Agilent 8922S)
Generator 0.3	HP/Agilent 8904A Option 001/002 Multifunction Synthesizer
GMSK Modulation
	Theory of the Test

Test 05: Audio

Frequency

Generator

The HP/Agilent 8904A is used to generate a 270.833 kHz clock and random data. This drives the UUT RF generator to generate the 0.3 GMSK modulated signals with random data. This signal is then analyzed by the UUT to assure that the frequency and phase errors are correct.

If the UUT is an Agilent 8922S, clock and data signals are generated internally, and the HP/Agilent 8904A is not used.

Things To Check In Case Of Problems

•This test should only be performed if the UUT analyzer is known to be accurate. Run test #9 first if there is any question about the accuracy of the UUT analyzer.

•Even when the accuracy of the UUT analyzer is known, its specification is such that this test still has a high degree of measurement uncertainty.

•A possibility to verify an instrument that fails this test may be to use a second Agilent 8922M/S to analyze the signal or use the HP/Agilent 11836A 0.3 GMSK measurement software. This software (and its associated hardware) has a lower measurement uncertainty but is not currently supported with the Agilent 8922 Performance Tests software.

Equipment Required

HP/Agilent 3456AVoltmeter

HP/Agilent 8903BAudio Analyzer

HP/Agilent 8902AMeasuring Receiver

Theory of the Test

The UUT is set to generate audio signals at various levels and frequencies. The voltmeter measures AC and DC level accuracy, the audio analyzer measures residual distortion, and the measuring receiver measures frequency accuracy.

Things To Check In Case Of Problems

•The measuring receiver and the UUT should have their timebases locked to make accurate frequency measurements.

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