SP395 SoundPro Audio Integrator Form7492 Operation Manual
79
How to use the IMD Distortion Meter
1. Set up the Output: Connect the SP395 output to the input of the device to be measured.
Note that you must use the SP395 generator for the most accurate results. The generator
automatically outputs the two-tone test signal selected within the IMD test type screen
(60Hz/7kHz or 8kHz/250Hz).
2. Set up the Input: Turn off the phantom power, set the input gain (auto-gain may be
used), and connect the device output to the SP395 left input.
3. Select Test Type - Select the desired IMD test, either SMPTE or DIN.
4. Turn Generator On – Turn the generator on to apply the two tone test signal.
5. Adjust Levels - Adjust the output level of the generator for an appropriate level to test the
unit under test. Be sure the correct input gain setting on the SP395 has been selected to
avoid input signal clipping.
6. Read Distortion – Read the distortion dB, % or line graph indicators.
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