Agilent Technologies 8510XF Operating And Service Manual page 101

RF Power Settings
RF Power On/Off
Unleveled/Overmod
Detection
If is selected, the RF source (83651B) performs its own
{RF LEVEL / INTERNAL}
leveling, using an internal detector.
•
To use the
{RF LEVEL / INTERNAL}
between the ALC output of the millimeter-wave controller and the ALC
input of the RF source.
•
To return to normal operation, you must restore that connection.
If is selected, the RF source performs its own leveling,
{RF LEVEL / EXTERNAL}
using an external detector.
If
{RF LEVEL / LEVELING OFF}
mode.
The softkey calls up a submenu (see
{RF POWER SETTINGS}
Settings" on page 3-33).
The softkeys
{RF POWER /ON}
source power.
On the second page of the menu (called up by the
four softkeys determine how the network analyzer processes error
information while it is sweeping. This has an impact on sweep speed.
Explanation
In frequency sweeping, an RF blanking interval occurs at each frequency
change (see "Blanking circuit" on page
blanking interval looks like an error condition ("unleveled" or "overmod").
To prevent the RF source from generating a spurious error message every
time the frequency changes, SRQ triggering for these errors is disabled at the
RF source throughout the sweep.
Triggering of "overmod" errors remains disabled throughout the sweep
(detection of this type of error is incompatible with 8510XF sweep
operation). However, the network analyzer is able to poll the source after
each blanking interval, and determine the status of the "unleveled" condition
flag (this verifies that no actual unleveled error occurred).
This polling process adds from 3 to 6 milliseconds of delay for each
frequency point. Some users will want to limit the amount of error polling
done by the analyzer, in order to speed up the sweep.
mode, you must break the connection
is selected, the RF source is set to the unleveled
and activate and deactivate RF
{RF POWER /OFF}
{MORE}
5-17). To the RF source, this
8510XF Network Analyzer Systems 3-31
Operation
RF Power
"RF Power
softkey), the first