User manual MCINTOSH MI3

[. . . ] MAXIMUM PERFORMANCE INDICATOR MI3 GENERAL DESCRIPTION The Mclntosh Ml 3 is five laboratory instruments combined into one compact instrument. It is a professional oscilloscope, relative signal strength indicator, calibrated FM deviation meter, calibrated balance meter, and phase indicator. These instruments are used by FM stations to determine the best possible performance for your listening enjoyment. The Mclntosh Ml 3 shows you what you need to do to improve your system's overall performance. It is designed to be used with an FM tuner and stereo preamplifier. To show multipath reception the Ml 3 displays instantaneous signal strength versus frequency deviation. [. . . ] Focus is easiest with the Scope Test switch in the TEST position. AUDIO DISPLAY--This control will increase the display area on the face of the cathode ray tube. At low volumes you will Find the display would be small. To see all the information present turn the AUDIO DISPLAY toward max. This will increase the size of the display. At high volumes you may want to turn down the AUDIO DISPLAY to reduce the size of the display. 4 SIGNAL STRENGTH (VERTICAL) MULTIPATH CONTROL This control adjusts the position of the Multipath trace display along the vertical scale of the indicator screen. DEVIATION (HORIZONTAL) MULTIPATH CONTROL This control adjusts the maximum width of the multipath trace display along the horizontal scale of the indicator screen. DEVIATION INPUT (TP2) This input connects to a Mclntosh tuner Test Point No. 2, which supplies a voltage proportional to deviation of the FM transmission for horizontal deflection of the indicator trace. LEFT AUDIO INPUT This input connects to the left output of a tuner, preamplifier, or power amplifier. The left channel audio signal voltage causes vertical deflection of the indicator trace. This input jack is in parallel with the left audio output jack. LEFT AUDIO OUTPUT This output jack is in parallel with the left audio input jack. This parallel connection makes it convenient for connecting a preamplifier or tuner output to both the Ml 3 and the power amplifier. RIGHT AUDIO INPUT This input connects to the right output of a tuner, preamplifier, or power amplifier. The right channel audio signal voltage causes a horizontal deflection of the indicator trace. This input jack is in parallel with the right audio output jacks. RIGHT AUDIO OUTPUT This output jack is in parallel with the right audio input jack. This parallel connection makes it convenient for connecting a preamplifier or tuner output to both the Ml 3 and the power amplifier. 1A SLO BLO LEFT GAIN (VERTICAL) AUDIO CONTROL This control adjusts the maximum vertical indicator trace deflection for a left channel audio signal. RIGHT GAIN (HORIZONTAL) AUDIO CONTROL This control adjusts the maximum horizontal indicator trace deflection from a right channel audio signal. SIGNAL STRENGTH INPUT (TP1) This input connects to a Mclntosh tuner Test Point No. 1, which supplies a voltage proportional to Signal Strength for vertical deflection of the indicator trace. A 1 ampere SLO-BLO fuse protects the Ml 3 indicator circuits. This fuse does not protect additional equipment connected to the back panel AC outlets. 350 WATTS AC OUTLET A 117 volt AC outlet is provided for extra equipment drawing as much as 350 watts power. [. . . ] Trace Dot Positioned at Bottom Center of Vertical Scale. 3. Uniform and Relatively Smooth Trace with Little or No Multipath Present (80% Modulation). 9 TYPICAL HOOK UP 10 TYPICAL The oscilloscope display shows you: PATTERNS STEREO SEPARATION LEFT TO RIGHT BALANCE SYSTEM PHASE Here is a display of excellent stereo separation. The Ml 3 shows the stereo separation from all stereo program material. You see the display change position and shape with the program material. [. . . ]