Input Port; Lower And Upper Acp [Ratio:level] - HP 8921A User Manual

Input Port

CAUTION:

Lower and Upper ACP [Ratio:Level]

This field selects the RF IN/OUT or ANT IN port for making RF measurements.
The RF IN/OUT port must be used for making TX Power or ACP Level
measurements on this screen.
Operating Considerations
Power levels for each port are printed on the Test Set's 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 two 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 or ACP Level on this screen using the ANT IN port.
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.
These two measurements display the amount of power in signals above and below
the signal. The level is displayed as a ratio (referenced to the power
Tune Freq
around the
Tune Freq
See Also
ACP Meas field description, on page 87
) or as an absolute value.
Chapter 4, Adjacent Channel Power Screen
Field Descriptions
91