Advertisement
HeJP
4-13
Sensitivity
The most apparent difference between the TRFL measurement and
the RF Power measurement is the increased measurement sensitivity
offered by the TRFL measurement. Since sensitivity is directly related to
measurement bandwidth, TRFL measurements using the IF Synchronous
detector offer the greatest measurement sensitivity (-127 dBm). When
you select the IF Average detector for your
TRFL
measurements,
measurement sensitivity is determined
by
the bandwidth of the selected
IF filter. That
is, the 30
kHz
IF filter offers 8
dB greater sensitivity
than
the 200 kHz IF filter. (The IF Average detector offers -100 dBm
measurement sensitivity with the automatically selected 30
kHz
filter.)
Like other
RF
power meters, the sensitivity of the
HP
8902A's
RF-
Power
measurement is determined by the dynamic range of the power
sensor
being used. The dynamic range o f the
HP
11722A Sensor Module, for
instance, is -20 to f30 dBm. Using other sensors, the sensitivity of
the
HP
8902As RF Power measurement can be extend from -70 to
+40
dBm. (Refer to your
HP
8902A Operation and Calibration Manual
for information on which power sensors can be used with the HP 8902A.)
Solwing Measuremenf
Problems
The HP 8902A has been designed to feedback information about its
operating
status.
When the
HP
8902A detects that the input signal
or operating conditions are preventing it from making an accurate,
reliable measurement, it alerts you
by
placing an error or dash
code in its display. The circumstances that can cause the
HP
8902A
to display an error code are classified into one o f two categories:
0
Input Problem
-
caused by input signal conditions, or
0
Operating Problem
-
caused by the selection of incompatible
operating functions.
Certain errors are caused only by an
inpuf problem,
other errors are caused
only by an operafing problem, and some errors can be caused
by
either.
The errors that can be caused only by an input problem and the errors that
can be caused only by an operating problem are listed in the following chart.
If your instrument is displaying one of these errors, proceed directly to
Table
4-3.
RF
Power and
TRFL
Error Codes and take the recovery
action recommended.
08, 10,
13,
01, 09, 12, 14, 15,
Advertisement
Chapters
