To Make An Rf Sensitivity Measurement - HP 8920A User Manual

Chapter 6, Call Processing Subsystem
Using the ANALOG MEAS Screen

To Make an RF Sensitivity Measurement

NOTE: The mobile station's speaker output must be connected to the Test Set's AUDIO IN and the
mobile station's microphone input must be connected to the Test Set's AUDIO OUT in order
to use the ANALOG MEAS screen.
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1. If not already done, condition the Test Set.
Processing" on page 141
2. If not already done, configure the Test Set.
for further information.
3. Connect the mobile station to the Test Set as shown in
Mobile Station to the Test Set," on page
4. Turn on the mobile station.
5. Ensure that the Test Set is in the connected state.
page 145 for information on how to bring a mobile station up on a voice channel.
6. If the ANALOG MEAS screen is not displayed, select the ANLG MEAS field from the
To Screen menu. The ANALOG MEAS screen will be displayed.
7. The following example illustrates how to make a 12 dB SINAD Receiver Sensitivity
measurement:
a. Select the AFGen1 Freq field and set it to 1 kHz.
b. Select the upper AFGen1 To field and set it to FM.
c. Select the lower AFGen1 To field and set it to 8 kHz.
d. Select the AF Anl In field and select Audio In.
e. Select the Filter 1 field and select C MESSAGE.
f. Select the Filter 2 field and select >99kHz LP.
g. Position the cursor on the De-Emphasis field and select Off.
h. Select the Detector field and select RMS.
i. Select the AF Freq measurement field and select SINAD.
j. Select the Amplitude field and begin to lower the transmitted base station voice
channel power until 12 dB SINAD is reached.
k. The mobile station might mute or drop off the air before a 12 dB SINAD is reached.
The performance of the mobile station at low RF levels is dependent upon the char-
acteristics of the mobile station (that is, what type of system it is designed for). Un-
like a real base station, the Test Set does not perform any protocol functions on the
voice channel.
See "Conditioning the Test Set for Call
for further information.
See "Configure the Test Set" on page 142
119.
See "Page a Mobile Station" on
Figure 17, "Connecting a