|
|
Subtract
The
IE‑45 provides a powerful function which allows the user to subtract one curve
from another. A stored scratch memory curve can be subtracted from the real
time display, or one scratch memory curve can be subtracted from another, or
from an Average curve. Tap the "Subtract" stylus button to access the
subtract control screen. Here you can choose which spectrum you wish to
subtract from another. Upon tapping "S1‑S2" the RTA display returns
with a "0" center reference and blue RTA bars. You are viewing the
one spectrum subtracted from the other. To return to normal RTA, tap the
Subtract stylus button and tap "Cancel".
NIC / "Continuous" NIC
The
measurement of NIC (Noise Isolation Class) is a staple of transmission loss or
noise isolation measurements. The traditional setup requires an
"inside" measurement (on the side of the barrier with the noise
source) and an "outside" measurement (on the side opposite from the
noise source) to be stored in separate memories. The NIC contour algorithms are
then applied to show the subtracted curve with the NIC contours (and, in the
case of Ivie's IE‑45, a calculation of the NIC number is also displayed.)
Ivie
has developed a new process called "Continuous NIC” (C‑NIC) which allows
continuous NIC measurement in real time. C‑NIC allows for real time on‑site
evaluation of transmission conditions through a barrier between two spaces.
With C‑NIC you can “sniff out” weak spots in isolation material in real time,
on site. For more information: C-NIC.PDF (128 KB)
|
