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4-3
Input to Send
The following tests will be testing the Input to Send path as seen in the diagram below:
Input To Send Tests In Bypass:
This test will verify the Audio signal path from the Rear Input to the Send output of the MPX G2
In Bypass
Signal Levels:
1. Apply a 1kHz-sinewave signal at +0.5dBu (820 mVRMS) to the Rear Guitar Input jack of the MPX G2.
2. Press the Edit button. The display will read Edit select Mix. Press the Yes button once. The display will
read Send Level. Turn the knob for a setting of -10.
3. Verify an output level reading between -0.64 to -1.76 dBu (720 to 632 mVRMS).
4. Reset the Send Level in the Edit menu to +8.
5. Verify an output level reading between 17.36 to 16.24 dBu (5.72 to 5.03 Vrms).
6. Apply a 1kHz-sinewave signal at +1dBu (870 mVRMS).
7. Turn the Bypass on by pressing the Bypass button on the front panel.
8. Verify an output level reading between 1.56 to -0.44 dBu (927 to 736 mVRMS).
9. Reapply a 1kHz-sinewave signal at +0.5dBu (820 mVRMS).
10. Turn off the Bypass from the front panel.
11. Add a 600Ω load to the output signal feeding the analyzer.
12. Verify an output level reading between 11.36 to -9.24 dBu (2.87 to .267 Vrms).
Frequency Response Measurement:
1. Disable all Filters on the Distortion Analyzer.
2. Apply a 1kHz-sinewave signal at +1dBu (870 mVRMS).
3. Set the Analyzer for a 0dB reference.
4. Verify the output level reading is between 1.0 to -1.5 dBu (875 to 647 mVRMS) at the following
frequency settings.
20,000Hz 16,000Hz 12,000Hz 10,000Hz
4,000Hz 2,000Hz 250Hz 100Hz
60Hz 20Hz
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