Tektronix WFM2200A, User Manual

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■ Level meter labels : Identifies the signal in each meter bar. The labels vary
according to whether the audio sources to the level meter bars are normal
channel pairs, surround channels, or Dolby sources (the Dolby source labels
include Dolby type).
■ Level meter ballistics readouts : Displays the selected dynamic response
characteristic.
■ Axes : Shows the orientation of the two audio signals when displaying phase;
shows the orientation and amplitudes of the sound field when displaying
surround sound. (Axes are selectable for an X-Y or Soundstage plot.)
■ Phase correlation meters : Displays the phase correlation between the two-
channel bars under which it appears. The meter of the pair selected for the
Phase display also appears in the Phase display. See
To check audio phase on
page 223.
■ Test level and Peak program level indicators : Diamond-shaped markers
between the level bars indicate the configurable limits set up for the display.
Above the Test level, the bar displays in a yellow color. Above the Peak
level, the bar displays in a red color. Test level is also known as Reference
level or Line-up level.
■ Level meter scale and units : By default, the units are in dB relative to full
scale (dBFS) for digital inputs and dB relative to 0.775 Volts (dBu) for
analog inputs. The 0 dB mark is digital Full scale for digital inputs and 0 dBu
for analog inputs. You may also set the 0 dB mark to either the Peak Program
level or the Test level.
Above-bar warning
messages
This instrument displays warning messages above the level meter bars. The
warning messages that can appear above the bars as follows:
■ Clip . The number of consecutive samples equals or exceeds the # Samples
for Clip setting.
■ Over . The signal is at or above the specified Over Level for a time exceeding
the Duration for Over setting.
In-bar warning messages This instrument displays warning messages within the level meter bars. The
warning messages that can appear are shown below in order of priority.
■ UNLOCKED . The instrument is not locked to an incoming signal on the
indicated input channel. Data cannot be decoded and all data and other errors
are ignored. This means that if an AES input is selected, nothing
recognizable is present on the input, or if embedded audio is selected, the
VIDEO input is unrecognizable.
■ AES PARITY. The incoming subframe does not have even parity as
specified by the digital audio standards. The data sample is unreliable and is
ignored. The level meters and Lissajous display treat the sample as a zero
sample.
Display modes
60 WFM2300 and WFM2200A Waveform Monitors User Manual