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136 Chapter 5
Analog Measurements - Screens and Control Fields
Input Gain Input Port
Input Gain
This field displays and selects the gain of the AF analyzer’s input
amplifier. The choices are 0 dB, 20 dB, or 40 dB. Refer to the Gain
Cntl field more information.
Screens on which this field is displayed
AF ANALZYER
Input Port
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 measurements.
Operating Considerations
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, reset using
Meas Reset (press and
release the Shift key, then the Hold 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 on the RF ANALYZER screen
using the ANT IN port.
CAUTION Connecting a signal of >60 mW to the ANT IN port can
cause instrument damage (although internal protection
circuits can typically withstand a short-duration signal of
several 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 reset using
Meas Reset
(press and release the Shift key, then the Hold key) or turn
the Test Set off and on.
Maximum signal levels at the RF IN/OUT, DUPLEX OUT,
and ANT IN ports are printed on the connector panel.
Exceeding these levels can cause permanent instrument
damage.
Screens on which this field is displayed
SPEC ANL: RF IN/ANT main controls menu
RF ANALYZER
Main Menu