3410 Series Gas Ultrasonic Meters Operations Manual
Section 4: Flow measurement
3-9000-777 Rev E
January 2018
Terminology
19
4.1.1
Terminology
•
Sequence - a complete cycle of firing all enabled transducers in a single round of
transducer operation (For example, when all eight transducers of the Model 3414 have
been fired in a single round of operation, it signifies the completion of one sequence.)
•
Stacking - the process of modifying a sequence so that each individual transducer is fired
“
x”
times (where
x
equals the stack size) before the next transducer in the sequence is
fired.
•
Stack size - the multiple of times each transducer is fired before the next transducer
within the sequence is fired (When stacking is absent or disabled, the stack size is
actually 1, because each enabled transducer is fired once during the sequence. When
stacking is applied or enabled, it is applied increments of 2, 4, 8, and 16 and are the only
stack size choices, so that each enabled transducer is fired 2, 4, 8, or 16 times before the
next transducer in the sequence is fired.)
•
Emission rate - the time elapsed before the next transducer in a sequence is fired,
regardless of stack size (minimum emission rate is 2 milliseconds with the Filter
ON
or
OFF
). We recommend the default Filter setting, which is the
OFF
position.
•
Stack emission rate - the time elapsed before a single transducer is re-fired when stacking
is enabled (minimum stack emission rate is 2 milliseconds with the Filter
OFF
.)
•
Chords inactive or active - the exclusion or inclusion of a chord-forming pair of
transducers in the sequence of transducer operation
•
Update time - the time elapsed, in seconds, between each processing, or recalculation of
data that is collected from sequences of transducer firings
•
Batch period, or batch cycle - synonymous with Update time, as defined above
•
Sample - refers to one point on the waveform as in samples per cycle. The data that is
collected from one Sequence of transducer operation (This term is displayed in the Daniel
MeterLink
Signal Analyzer
screen, and is nearly synonymous with Sequence, as defined
above. That is,
Samples/update
, as displayed in the Daniel MeterLink
Signal Analyzer
Wizard
, could be interpreted as Sequences/update.) This shows the average number of
new samples collected during an update period.
