9/29/09 System 824 Virtual Instruments 6-7
The DC output is generated digitally
from the SPL but is slower than the
SLOW or FAST detector response
with an exponential time constant of
approximately 2.25 seconds.
For the AUD instrument, AC-1 is on the tip and the DC
output is not used.
For the RTA instrument, the AC signal will be identical on
the tip and ring.
Logging SLM
The Logging SLM (LOG) instrument is ideal for
applications requiring the automatic measurement and
storage of multiple parameters over an extended period as
required for environmental noise monitoring. The Logging
SLM provides automatic logging of sound level parameters
including Interval data, L
n
statistics, noise event detection
and event time history records. Additionally, this mode
provides a dynamic range of 115 dB.
Like other instrument modes, the Logging SLM mode is
selected via the Setup menu. This section covers some of the
data acquisition features of the LOG instrument.
Time History
The System 824 Time History logs L
eq
readings and up to 37
additional parameters. The Time History graphical display
allows you to scroll through the time history and Run/Stop
events.
Interval History
The following Interval History parameters can be logged at
user-selectable time intervals between 1 second and 99
hours (hh:mm:ss)
•L
max
, L
min
, SEL, and L
eq
(q=3) or Time Weighted Aver-
age (q=4, 5, or 6) levels for a selected detector (Slow,
Fast, or Impulse) and a selected frequency weighting (A,
C, or Flat)
To Next Page
Loading...
Need help?
General
