Technical data

85108L System Manual
Specifications and Performance Verification
Overview
4-2
Overview
After installation of the system is complete and the operator’s tests have been successfully
completed, a performance verification is necessary to assure that the system is operating within its
expected measurement uncertainties. A performance verification (in either pulsed-RF mode or
nonpulsed-RF mode, but not both) is included with the purchase of an 85108 System.
The verification procedure for the pulsed-RF system is summarized here. Refer to the Performance
Verification and Specifications section of the 8510C On-Site Service Manual (Agilent part number
08510-90282) for an in-depth explanation of the procedure.
NOTE Performance of the Agilent 85108L system is not specified at RF frequencies of
exactly 60 MHz, 80 MHz, and 100 MHz. This is due to excess noise caused by
spurious responses occurring at harmonics of the 85110L 20 MHz IF frequency.
Of these frequencies, 100 MHz is the only frequency measured during the
performance verification process. The performance verification procedure will
indicate FAIL for the 100 MHz S21 and S12 measurements of both the 20 dB
attenuator and the 50 dB attenuator. This failure is expected. Therefore, the 85108L
system is considered to have PASSED the performance verification procedure if the
only failed points are the 100 MHz measurements of the attenuator’s S21 and S12
parameters.
Refer to Appendix D, “Avoiding the Effects of Spurs,” for more information. Also, refer
to multiple source settings in Appendix B , “Hardware and Instrument States,” for
correct source 2 offset frequency settings.
This procedure documents the verification with the system in pulsed-RF mode (wide BW detectors).
Any changes to the setup for a nonpulsed-RF verification (normal BW detectors) are noted as they
occur.
Performance verification of your pulsed-RF system consists of:
1. Connecting the computer and warming up the system.
2. Loading BASIC and BIN files.
3. Loading and running the performance verification software.
4. Performance testing in 7 mm:
a. Setting the configuration.
b. Performing a measurement calibration.
c. Measuring the verification standards.
Figure 4-1 is a simplified flow diagram of the 8510 Specification and Performance Verification
software program. The flow diagram shows the main menus and paths of the program.