Tektronix WFM8200 User Manual page 163

Audio Monitoring
the correlation between the adjacent channels. A short-to-medium length
green bar indicates positive correlation between the channels, forming a
localized phantom sound source located at the white tic mark. The bar grows
to full length and changes color to yellow as the correlation moves to zero,
indicating a wide, non-localized sound image. The bar changes color to red
for adjacent channels with significant negative correlation. For negative
correlations, the ends of the PSI for the L and R channels continue to grow at
a 45° angle while the other PSIs remain at full length.
Center-Pairs Phantom Sound Indicator – a fifth PSI at the top of the display
shows potential phantom sources formed by the LC channel pair and the CR
channel pair. If the L, R, and C channels all have the same signal level, the
white tic mark on the bar appears directly above the C level indicator. The
white tic mark moves right or left depending on the relative balance between
the three channels. A short bar to the left of the white tic mark indicates
a positive correlation between L and C. The bar grows as the correlation
decreases. Like the L-R PSI, the bar continues to grow at a 45° angle for
negative signal correlations. The bar to the right of the white tic mark behaves
similarly, depending on the C-R correlation. This PSI indicator uses the same
color coding as the other PSI indicators.
WFM8200 and WFM8300 Waveform Monitors 147