HP 8542E Installation And Verification Manual

Also see for 85422E: User guide

Contents

15. Displayed Average Noise Level for Receiver RF SectionThis test measures the displayed average noise level in all fourfrequency bands. The RF INPUT is terminated in 50 . In Band 0(9 kHz to 2.9 GHz), the test rst measures the average noise at400 kHz and 1 MHz in zero span. The LO feedthrough is used as afrequency reference for these measurements. For the rest of Band 0and for all of the remaining bands, the test tunes the RF sectionfrequency across the band, uses the marker to locate the frequencywith the highest response, and then reads the average noise in zerospan.To reduce measurement uncertainty due to input attenuator switchingand resolution bandwidth switching, a reference level o set isadded. The CAL OUT signal is used as the amplitude reference fordetermining the amount of o set required. The o set is removed atthe end of the test by pressing PRESET .Equipment Required Cable, BNC, 23 cm (9 in)Termination, 50 APC 3.5Adapter, Type N (m) to BNC (f)Adapter, Type N (m) to APC 3.5 (f)Figure 2-19. Displayed Average Noise Level Test SetupProcedure 1. Connect a cable from the CAL OUT to the INPUT 50 of thereceiver as shown in Figure 2-19 .2. Press PRESET on the RF section, then wait for the preset routineto nish. Set the RF section by pressing the following keys:FREQUENCY NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNCENTER FREQ 300 MHzSPAN 10 MHzAMPLITUDE NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNMore 1 of 3 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNAmptd Units NNNNNNNNNNNdBmAMPLITUDE NNNNNNNNNNNNNNNNNNNNNNNREF LVL 20 NNNNNNNNNNNNNNNdBmNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNATTEN AUTO MAN MAN 0 dB2-78 Operation Veri cation