Basic Instrument Functions
R&S
®
CMW500
104
User Manual 1173.9463.02 ─ 02
RF Loop Test
A signal which is generated on one of the installed TRX modules is routed to a frontend
connector RF <n> COM and back to the TRX module. The main purpose of the test is to
verify the connections between the TRX module and the frontend. The RF loop is mea-
sured at different frequencies and TX levels using an additional BB measurement module.
The header row of the overall loop test shows the output levels in dBm at the RF <n>
COM connectors. The actual levels measured are approx. 6 dB above the equivalent RF
<n> COM levels.
Sample Bus Test
A pseudo-random bit sequence (PRBS) is transferred over the sample bus between two
hardware modules. The R&S CMW500 compares the transmitted PRBS with the received
PRBS and verifies that no bit errors occur in the transmission path.
External Tests
One or more R&S CMW500 connectors are tested using external cable connections.
External tests require the "User (Extended)" mode; see
Note:
The "IP Access Test External" shown above requires a fixed IP address 172.22.1.3
for the LAN REMOTE network adapter; see
chapter 2.7.1.2, "Applications with Fixed IP
When the test is started, the R&S CMW500 prompts for the appropriate cable connection,
e.g.:
A similar message ("Please disconnect...") after the test is finished.
Setup Dialog
