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Chapter 6 201
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
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
Internal
This field selects the trigger source.
• Internal uses the signal being displayed for triggering.
• Ext (TTL) uses the EXT SCOPE TRIGGER INPUT for triggering.
This is a TTL level trigger (approximately 2.5 V).
Screens on which this field is displayed
SCOPE: trigger controls menu