Tektronix WFM8200 Technical Reference page 34

Specifications
Table 21: Audio bar displays (cont.)
Characteristic
Level Meter Resolution
Correlation Meter Speed
Metering Ballistic Types
18
Performance requirement
WVR8200 and WVR8300 Specifications and Performance Verification
Reference information
0.056 dB steps at 30 dB scale, from full scale
to –20 dB FS
XGA Full Screen mode = 510 steps XGA
4-tile mode = 255 steps
User selectable 1 to 20. Factory default is
set to 8.
Speed 1 averages over 0.04 sec.
Speed 2 averages over 0.04 sec.
Speed 3 averages over 0.08 sec.
Speed 4 averages over 0.12 sec.
Speed 5 averages over 0.28 sec.
Speed 6 averages over 0.52 sec.
Speed 7 averages over 1.0 sec.
Speed 8 averages over 1.5 sec.
Speed 9 averages over 2.0 sec.
Speed 10 averages over 2.5 sec.
Speed 11 averages over 3.0 sec.
Speed 12 averages over 3.5 sec.
Speed 13 averages over 4.0 sec.
Speed 14 averages over 4.5 sec.
Speed 15 averages over 5.0 sec.
Speed 16 averages over 5.5 sec.
Speed 17 averages over 6.0 sec.
Speed 18 averages over 6.5 sec.
Speed 19 averages over 7.0 sec.
Speed 20 averages over 7.5 sec.
The Phase Correlation Meter Speed setting
determines how quickly the meter reacts to
changes in phase relationship. The meter
reading is actually an average of correlation
over time, and this setting determines how
many samples are used to calculate the
average. The instrument uses the fewest
samples when this setting is 1, and the
meter reacts almost instantaneously. The
instrument uses the most samples when the
setting is 20, and the meter reacts much
more slowly. Experiment to find the setting
that best fits your application
Selectable from true peak, PPM Type 1,
PPM Type 2, and Extended VU