Service manual

2-42 8510XF Network Analyzer Systems
Installation
Operating Notes
Operating Notes
Once the system is configured according to the instructions in the previous
section, it is ready for normal operation. The following should be noted:
Frequency Resolution At test frequencies above 50 GHz, the frequency resolution of the 8510XF is
limited by harmonic multiplication of the RF source. Therefore, some
frequency settings will be slightly modified by the network analyzer
(59.999999996 GHz instead of a requested 60 GHz, for example).
User Parameters If you are looking at unratioed user parameters (al, bl, a2, b2) you may see a
discontinuity at the beginning and end of the trace, or at band changes.
User Preset You may press the green [USER PRESET] key at any time to return the network
analyzer to a predefined state. The preset function performs all necessary
internal network analyzer initialization, then recalls Instrument State 8.
[USER PRESET] does not send an initialization signal to the other instruments
on the system bus.
Factory Preset To re-initialize the network analyzer to the 8510XF factory settings, select
[RECALL] {MORE} {FACTORY PRESET}. This preset initializes all instrument state
functions to their default conditions (except for the frequency range); it also
initializes all instruments on the System Bus.
Power Domain Default
Settings
In the 8510XF, the factory preset default settings for power domain
measurement are as follows:
• Start: −35 dBm
• Stop: −15 dBm
IF Frequency Default
Setting
In the 8510XF, the factory preset default value of the network analyzer IF is
20.000017 MHz (in other words, an offset of 17 Hz has been added to the
nominal 20 MHz IF). See “IF Frequency” on page 3-42 for information
about this offset, and instructions on how to modify it.
CAUTION If the operating system is reloaded, it is necessary to perform the detector
gain calibration (refer to “Detector Gain Calibration” on page 5-6).