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59 Preparing to measure
Sessions and Studies
Models SE and DL
Preparing to measure
Sessions and Studies
Before you begin running a session/study, there are a couple items to consider:
• Understanding sessions and studies
• Adjusting the measurement range before running a study
• Calibrating the instrument
The following components explain how the data is stored on the instrument.
Storing Data
Explanations
Session
A session is comprised of one or more studies and uses data
derived or accumulated from those studies to arrive at session
results. The measurements in a session are the same ones
made in each study in the session. For example, the maximum
SPL determined for each study in a session is compared to the
maximums for each other study in the session to determine the
maximum SPL for the entire session. Likewise, an average or an
accumulation for a study is continued using data from
subsequent studies in the session to arrive at the corresponding
average or accumulation for the entire session.
Studies
Studies are periods in a session during which measurements
are acquired, processed and saved by the instrument. The
duration of each study period is called the study’s run time.
Session and
Study
Scenario
You will be running a sound test in a machine shop. Your main
objective is to determine the noise in three different work areas
of the plant which include two different machinist areas and a
welding area. You set the SoundPro to run and pause three
times at one-hour intervals. When the tests are completed, you
upload the data into QSP-II. The tests will store as one
“Session” under “Downloaded” node and each one-hour test is
denoted as a “Study”.
Table 5-2: Sessions and studies explained
CAUTION: The memory card should not be inserted or removed during a study—
you can lose data.