Tektronix CMD 80, Руководство пользователя

Страница: 163 / 672

Analog: Module Test
3–96
CMD 80 Digital Radiocommunication Tester User Manual
Module Test
NOTE
. The tester displays analog module test menus only if you have Option B82
installed and have selected the US CELLULAR, JAPAN CELLULAR, or CHINA
CELLULAR network and ANALOG system (refer to NETWORK on page 3–3).
The MODULE TEST softkey selects the module test measurements for the
system selected with the SYSTEM softkey. This section discusses the tests
available when you have selected ANALOG as the system.
The module test feature supports testing the components of a mobile station
before they are assembled into a unit that is capable of completing a call. The
tester transmits a configurable forward voice channel while ignoring the
information content in the reverse channel. This allows the tester to measure the
power level and waveform quality on the reverse channel while not requiring that
the module-under-test be capable of establishing or maintaining a call.
It is up to you to force the module-under-test into an appropriate state before
performing the module tests. In some cases, you may want to manually force
other conditions that are not under the control of the tester in this mode of
operation. Examples of this are the enabling or disabling of the audio compandor
or the pre-emphasis/de-emphasis functions.
Press the MODULE TEST softkey to display the ANALOG MODULE TEST
menu for the AMPS, JTACS, TACS, and ETACS standards (see Figure 3–68).
NOTE . Since there are several differences in the menus for NAMPS (see
Figure 3–69 on page 3–98) and NTACS (see Figure 3–70 on page 3–100), their
unique fields and softkeys are discussed following the menu description for the
AMPS standard.
The menu shows the test results for the transmitter quality of the mobile station.
A measurement that exceeds its result limit displays in inverse video.
NOTE
. The tester uses internal filters in determining the results in the ANALOG
MODULE TEST menu. Refer to Appendix B for filter descriptions and their use.