Keysight N5221A/22A Service Guide 3-39Tests and AdjustmentsPerformance Tests— Failure of the source or load match error terms is due to faulty hardwarebetween the test port and the internal source. Refer to Chapter 7, “Repairand Replacement Procedures.” for instructions on replacing the suspectedfaulty component or assembly.Dynamic Accuracy TestThis description applies to all N522xA, N5231A/32A/34A/35A/39A, andN5247A instruments.Function of the Test: To measure the relative power linearity of the analyzer’sreceivers.Specification Tested: Test Port Input–Dynamic AccuracyEquipment Used:— U3020AD01 dynamic accuracy test set— Signal generator— Power meter— Power sensor— Two test cablesDescription of the Test:1. The analyzer’s test ports are tested separately at a specific CW frequencyand a reference power level of -20 dBm.2. A test cable is connected between the analyzer’s source port and thedynamic accuracy test set’s Source 1 In port. A test cable is connectedbetween the signal generator and the test set’s Source 2 In port. A testcable is connected to the test set’s Receiver Out port, and the powersensor is connected to the end of this cable.The test set’s output attenuator is set to 20 dB. With the signal generatorRF turned off, the PNA source power is adjusted until the power sensorreads -20 dBm. The PNA source is then turned off, the signal generator RFis turned on, and the signal generator power is adjusted until the powersensor reads -20 dBm.3. The power sensor is disconnected and the test cable is attached to theanalyzer port under test.4. Both sources are turned on and the signal generator’s frequency is set to 2Hz above the analyzer’s frequency. By combining these two signalstogether, the resultant signal will be a perfect sine wave with a magnitudewhich varies from -17 dBm to -23 dBm at a rate of 2 Hz.5. The analyzer’s receiver measurement is retrieved and compared with aperfect sine wave. Any deviation is due to receiver non-linearity.6. The test set’s output attenuator is changed in 5 dB steps from 0 to 60 dB,and this measurement is repeated.
