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Model 11848A
General Information
General Information
INTRODUCTION
This Service Manual contains information for installation of the Hewlett-Packard Model 11848A Phase
Noise Interface.
The HP 11848A is the Phase Noise Interface for the HP 3048A Phase Noise Measurement System.
The Interface supports several measurement techniques for phase noise and AM noise measurements.
Inside the Interface are the phase detectors, amplifiers, filters, and switches necessary to measure phase
noise over a frequency range of 5 MHz to 18 GHz. An input for an external phase detector outside
that frequency range is also provided. The built-in sources allow the system to functionally check all
of its signal handling circuits to insure proper operation before measurements are made.
INSTRUMENTS COVERED BY THIS MANUAL
Attached to the instrument is a serial number plate. The serial number is in the form 1234A00123.
The first four digits and the letter are the serial prefix. The last five digits form the sequential suffix
that is unique to each instrument.
SPECIFICATIONS
The specifications for the Interface are included in the specifications for the HP 3048A Phase Noise
Measurement System which specifies the entire system. There are no specifications that apply to the
Interface alone.
PERFORMANCE TESTS
The performance Tests for the Interface are included in the performance tests for the HP 3048A Phase
Noise Measurement System. These tests can be found in Appendix B of the HP 3048A Operating
Manual
It is not necessary to run the System performance tests after the System is initially installed. These
tests are performed at the factory before shipment. However, performance tests should be run every
12 months or whenever the Interface has been repaired.
CALIBRATION
The calibration of the Interface consists of generating correction factors for the various measurement
paths and storing them on the software disc for corrections of 0 Hz to 100 kHz as CALDATALO and
100 kHz to 40 MHz as CALDATAHI. Stored with CALDATAHI are the nominal voltages (VNOMs)
to set each internal source to its nominal frequency.
The calibration of the Interface is only part of the calibration of the HP 3048A Phase Noise
Measurement System and must be done with the System. For calibration refer to the HP 3048A Phase
Noise Measurement System Reference Manual.
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