If Filter - HP 8920A User Manual

IF Filter

Input Port
CAUTION:
This field selects the desired IF filter bandwidth for modulated signals being
analyzed.
This field selects the RF IN/OUT or ANT IN connector for making RF
measurements. The RF IN/OUT port must be used for making
measurements on this screen.
Operating Considerations
Maximum signal levels at each port are printed on the front panel.
If the RF power at the RF IN/OUT port exceeds allowable limits, a loud warning
signal sounds and a message appears at the top of the screen. If this occurs,
disconnect the RF power, press the MEAS RESET key, and allow the Test Set to
cool off for approximately 2 minutes before making any other measurements on
this port.
The ANT IN (antenna input) connector provides a highly-sensitive input for very
low-level signals (such as "off-the-air" measurements). You cannot measure TX
(RF) Power on this screen using the ANT IN port. However, low-level RF power
at the ANT IN port can be measured using the Spectrum Analyzer.
Connecting a signal of >200 mW to the ANT IN port can cause instrument damage (although
internal protection circuits can typically withstand a short-duration signal of 1 or 2 Watts).
If the overpower circuit is triggered (signified by a warning message at the top of
the screen), remove the signal from the ANT IN port, and press the MEAS
RESET key or turn the Test Set off and on to reset it.
Chapter 9, Duplex Test Screen
Field Descriptions
TX Power
349