Can I convert my 1.5 GHz ESA Spectrum Analyzer input impedance from 50Ω to 75Ω or vice versa from 75Ω to 50Ω?

Agilent does not supply a specific upgrade kit to change the input impedance of the Spectrum Analyzer. It is not a simple connector change, rather an entire R.F. assembly, model ID label, and connector label. Here is a listing of parts that would have to be changed out in order to convert your Spectrum Analyzer.

Note: The analyzer CANNOT have a 50Ω Tracking Generator, option 1DN and be used with a 75Ω input impedance, option 1DP. Similarly, the analyzer CANNOT have a 75Ω Tracking Generator, option 1DQ and be used with a 50Ω input impedance. The Tracking Generator output impedance MUST match the analyzer input impedance or the analyzer will not be able to be calibrated at an Agilent Service Center.

Once the R.F. assembly is changed the following tests must be performed in order for the analyzer to meet published specifications.

Adjustments:

• Frequency Response

An ESA Signal Analyzer can only be adjusted using the N7800A field test software.  This software also requires specific test equipment, so in most all cases adjustments must be performed at an Agilent Service Center.

Performance Tests:

• 10 MHz Reference Accuracy
• Noise Sidebands
• Sytem-Related Sidebands
• Residual FM
• Frequency Span Readout Accuracy
• Fequency Readout and Marker Count Accuracy
• Absolute Amplitude Accuracy
• Frequency Response
• Spurious Responses
• Gain Compression
• Other Input Related Spurious Responses
• Displayed Average Noise Level
• Residual Responses

A complete listing of analyzer performance tests and the test equipment requirements can be found in the ESA Calibration Guide at:

http://www.agilent.com/find/esa

and then click on Technical Support, Manuals and look for the "ESA Spectrum Analyzer Calibration Guide" link.