Ivie IE-45 RTA - Real Time Analysis - Manual (Page 21)

Ivie IE-45 Manual
page 21
Spectrograph Display
IE-45 Spectrograph Display
In the example above, the spectrograph shown by the IE-45 Spectrograph Display represents an elapsed meas-
urement time of one second. The center marker window indicates that the measurement bar of data at the cen-
ter of the screen is 0.5 seconds displaced in time from the bottom of the screen (real time). It also indicates
that the number of measurement bars displayed on the half-scale screen is ten (10), or twenty (20) full screen..
The display is set in the Maximum Resolution mode. The display range and scale are set using “Set dB Scale”
function found in the RTA “Options” pop-up menu. Using “Set dB Scale,” the selected display settings are:
60dB center scale and 5dB per division. This translates to a top-of-the-screen amplitude of 75dB and a bottom-
of-the-screen amplitude of 45dB. Therefore, any amplitude equal to or below 45dB in a 1/12th octave channel
is shown in blue. Any amplitude equal to or higher than 75dB in a 1/12th octave band is shown in red.
Amplitudes in between 45dB and 75dB fall into the color spectrum between blue and red.
IE-45 Shown with optional IE-5P Preamplifier
and 1201 microphone capsule for Type I
measurement performance capability.
1201 Microphone Capsule
IE-5P Microphone Preamplifier
Left/right “Joystick” controls the
number of lines displayed on
screen. The more lines displayed
on the screen, the greater the time
represented by a full screen and the
slower the screen rolls upward.
To select the Spectrograph Display, tap
the “Options” Pull-down menu and then
select “Spectrograph” from the menu.