| Stereo-audio operations require tight control of relative L and R
amplitude and phase to ensure correct directional response for stereo listeners and to
prevent serious degradation of the L+R component for monaural listeners. Model 5835
provides the means to monitor stereo signals with an X-Y plot that shows both amplitudes
and relative phase of L and R signals (a Lissajous pattern). Further, an automatic alarm
is triggered if a serious phase error, as might be caused by a polarity inversion in
either stereo feed, results in a significant L-R component for more than five seconds. The
warning appears on a front-panel LED and can be rigged for a remote alarm. The 5835 mounts
in a standard half-rack adapter to take its place in studio or transmitter monitoring
operations. Two interchangeable graticules are provided to allow the 5835 to be set up for
the standard of L versus R plot or the newer plot of L+R versus L-R. The change is
effected by internal jumper connections. Both balanced (XLR) and single-ended (phono-type
connector) inputs are provided. A -20 dB, 0 dB, +10 dB range switch includes a CAL setting
and is augmented with a VARIABLE control. |
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