Keysight U8903B, User Manual

Page: 380 / 605

7 Test Sequence Application
380 Keysight U8903B User’s Guide
Receiver sensitivity
Receiver sensitivity measurement uses an external RF (radio frequency) signal generator to
create a RF stimulus signal that is moved across a range of powers in a specified number of
points. The DUT output which is in analog audio is acquired by the analyzer and processed
for display.
The receiver sensitivity measurement is typically used for characterizing radio sensitivity by
measuring SINAD. SINAD is an audio quality value that is used to specify the RF sensitivity
of radio receivers. A higher SINAD value indicates higher quality audio.
Figure 7-53 shows a general setup for the receiver sensitivity measurement. A signal
generator provides its own modulation and the U8903B controls the signal generator
through Keysight 82357B USB/GPIB interface. A receiver such as a two-way radio is
connected to the U8903B either by a direct connection or through an acoustic coupler.
Figure 7-53 General setup for the receiver sensitivity measurement
Set the audio output level of the receiver as required and the signal generator settings to
the desired value. The U8903B will automatically adjust the RF power output from the
signal generator so that the targeted SINAD is produced at the receiver output. The
targeted SINAD value is generally 12 dB for a communications receiver and 23 dB (mono)
or 26 dB (stereo) for a broadcast receiver such as a car radio or Hi-Fi tuner.
The results are displayed on an X-Y graph, with the RF power parameter on the X-axis and
the measured SINAD results on the Y-axis. Refer to “
Measurement Results ” on page 399
for more information on the respective result menu page. Use the arrow keys to navigate
through the respective tabs and to display the menu page.
NOTE
Receiver sensitivity measurement will be unavailable if the Bluetooth interface is selected
for the input configuration.