Model 90 Quantifier Sound Level Meter
Page 51
Understanding how the measurements are stored
The memory of the MODEL 90 can store up to 1,300 measurements. Each
measurement is known as an Event and can be either Broadband, 1:1 Octave Band or
1:3 Octave Band.
The duration of each measurement does not affect the size that it takes, but the
different measurements types take up different amounts of space in the instrument
memory.
For example, a Broadband measurement take 1 memory slot, a 1:1 Octave
measurement takes 2 memory slots and a 1:3 Octave measurement takes 3 memory
slots.
The diagram below shows how the different measurements take up different amounts
of memory space.
The maximum time over which Broadband measurements can be stored depends upon
the duration of the measurement. The table below shows the maximum time over
which measurements can be made. Please note that this applies only to Broadband
Measurements using the Auto Repeat function.
Measurement Duration
Maximum Length of Measurement
1 minute
21.5 hours
5 minutes
4.5 days
15 minutes
13.5 days
30 minutes
27 days
1 hour
54 days
With each Broadband Measurement is also stored a Time History measurement. This
information is stored in a separate memory from the Events and does not take up any
of the 1,300 Event memories. However, the Time History memory is limited to a size of
1,008,000 samples at 1 second samples, which is just over 11 days of data storage.
If the Time History Store is full before the Event Memory Store, the Event
measurements will continue but will not have Time History data.
The diagram below shows an example of this.
