176 Part H: Diagnosing © Tait Electronics Limited December 20074. In the Input area, click Start Test.The Audio Input gauge displays the audio level. The numeric value of thelevel appears under the gauge heading. The value is displayed in red if it isoff the scale of the gauge. Levels are measured over a window of 100 ms andupdated twice a second.5. Click Stop Test or return to Run mode to end the test.Generating an Audio OutputThe reciter can output an audio test tone at one of three pre-definedfrequencies. You can use this to test the reciter's ability to put audio on itsoutput lines or to set up and configure the interface from external equipmentto the base station. The audio is output at a nominal 0 dBm.1. Select Diagnose > Reciter > Audio I/O.2. In the Output area, specify which line out will carry the output.3. Click Start Test.4. View the Audio Output gauge and check that the measured level is closeto 0 dBm (balanced line out) or 0.8 Vpp (unbalanced line out).5. Click Stop Test or return the base station to Run mode to end the test.Digital I/O TestsThe Digital I/O form (Diagnose > Reciter > Digital I/O) lets you work withdigital inputs and outputs. You can view the current state of all digital inputsand toggle any digital output to help you test any equipment connected to it.The Hardware channel number box indicates the channel number that iscurrently set by external equipment using the channel select lines on the systeminterface. If the box is disabled, this is because external channel selection isdisabled (Configure > Base Station > System Interface.)The Digital outputs area lets you toggle any digital output between active(green LED) and inactive (gray LED). You can do the same to the Rx Gate andCoax Relay outputs.
