Lexicon RV-8 Service Manual page 38

Signal to Noise Test (SNR):
1. Using the signal level from step 5 of the Frequency Response Test above, turn off the oscillator and
verify a noise level measurement <-102dBr.
2. This procedure should be repeated to test Analog Inputs 2 through 8. To do this, move the cable from
the output of the Low Distortion Oscillator to the next pair of inputs, and repeat the tests above to test
the remaining Main Zone RCA outputs.
Analog Audio Inputs to Amplifier Outputs Tests
This test will verify the specifications of the Analog RCA inputs to the amplifier outputs.
Setup:
1. Connect an audio cable between the output of the Low Distortion Oscillator and the RV-8 Left RCA
input 1.
2. Connect an audio cable between the front left amplifier output of the RV-8 and the input of the
Distortion Analyzer.
3. Using the Menu /
4. In the AUDIO I/O TEST menu, highlight AUDIO INPUT 1 TEST. Press the Menu
remote control to engage the test. The RV-8 is now set to route audio from the left and right RCA
inputs labeled 1 to all amplifier outputs.
Gain Test (GAIN):
1. Apply a 1kHz signal @ +1Vrms to the RV-8 Left RCA analog input 1.
2. Set the scale on the Distortion Analyzer to measure +8Vrms signal level.
3. Turn all the filters off on the Analyzer (Filter not required for Gain Test).
4. Verify that the output level measurement from the RV-8 is between the range of +7.55Vrms and
+8.35Vrms. Note this level.
Total Harmonic Distortion Test (THD):
1. Adjust the scale on the Distortion Analyzer to measure 0.01% THD+N and turn off the low pass or
audio band pass filter.
2. Verify that the THD+N measured on the Analyzer is less than 0.05%.
Frequency Response Test (FREQ):
1. Set the scale on the Distortion Analyzer to measure +1Vrms signal level.
2. Using the output level from step 4 of the Gain Test, set the Distortion Analyzer for a 0dB reference to
check frequency response of the RV-8.
3. Turn the filter on the Analyzer off.
4. Sweep the oscillator frequency from 10Hz to 100kHz.
5. Verify the signal levels are +0.10dBr to –0.5dBr (10/20Hz-20kHz), +0.10dBr to –0.2dBr (20Hz-
20kHz), +0.10dBr to –0.5dBr (40kHz), and +0.10dBr to –3.0dBr (100kHz) of reference level over the
entire sweep. Note these levels.
4-20
arrows, scroll through the Diagnostic Menu and select the AUDIO I/O TESTS.
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