Ivie IE-35 RTA - Real Time Analysis - Manual (Page 12)

Ivie IE-33 & IE-35 Manual
page 12
Real Time Analyzer Controls
Real Time Analyzer Controls
Stylus Buttons: The IE-33 and IE-35 are several instruments in the same package: Real Time Analyzer,
Sound Level Meter, Signal Generator, Oscilloscope etc. One of their most powerful functions is Real Time
Analyzer (RTA). To make operation simple and intuitive, the most often used controls for the RTA are labeled
stylus buttons. The illustration across the page shows the stylus buttons associated with the RTA. Displays of
octave, third octave, sixth octave and maximum resolution (2048 FFT data points) are selectable as shown.
iPAQ and Axim Buttons: The IE-33 and IE-35 make use of the buttons found on the iPAQ and the Axim. Their
use is defined as shown across the page. The joy stick up/down function can be used to quickly adjust the dis-
play to bring the signal to the center of the screen. Either the stylus “Zoom In” and “Zoom Out” buttons, or the
push buttons to the right of the joy stick can be used to adjust screen resolution.
Pop-up Menus: Additionally, pop-up menus provide more features and selection capability. Tapping the
“Function” menu on the bottom of the screen with the stylus allows the selection of the RTA function. The vari-
ous displays of the RTA function are shown in the illustration across the page. Below RTA in the Function menu
is “RTA LEDs.” Selecting this function will provide a display that looks like an LED bar graph that many are so
familiar with. The advantage of this display is that the screen resolution can be adjusted so each LED repre-
sents 1dB, 2dB or 3dB. These increments are very useful when equalizing a sound system.
To set the level at the center of the screen (dB Level) and to adjust the dynamic range of the screen (dB per
Division), tap the "Display" menu. Next, from the pop-up menu, select "Set dB Scale." The window shown on
the IE-33 at the bottom of the opposite page shows this feature (the IE-35 is identical). The other functions of
the pop-up menus are covered in detail in other sections of this manual.
Decay: Display speed (averaging time) is controlled by the stylus button titled “Decay.” Decay 1 is the fastest
response time available, with Decay 2 somewhat slower and Decay 3 being the slowest. Decay 3 is intended
for use with pink noise.
Start/Stop Stylus Button: This button stops (freezes) the RTA and SPL displays and starts them again when
tapped a second time.
RTA Display On/Off: The RTA display can be turned on or off using the stylus button illustrated across the
page. Green button indicates “On,” and brown button indicates “Off.”
Average Display On/Off: The Average display (when the Average function is active) can be turned on or off
using the stylus button. Green button indicates “On,” and brown button indicates “Off.” A red button indicates
the Average function is not active.
Memory Stylus Buttons: The IE-33 and IE-35 have 9 “scratch” memories (see the “Memory” section of this
manual for more information on memory and data storage). To store data in a scratch memory, tap the num-
bered stylus button. A “snapshot” will be stored. If you are in the Average mode, the average curve will be
stored. When a memory is empty, its stylus button is red. Memories with data in them have green stylus but-
tons when being displayed and brown when not being displayed. The last memory stored or activated for dis-
play always has a blue stylus button. Several memories can be displayed simultaneously and each will have its
own color on the display so it can be differentiated.
Preferred Curve: The last stylus button in the row of memory status buttons is the memory status button for
“Preferred Curve.” This is a very powerful function and its use is covered extensively in the section of this man-
ual titled “RTA -Preferred Curve, Display Weighting, LED Display.”
SPL Readout Stylus Button: Tapping the SPL readout area will cause the analyzer to step through its electri-
cal measurement modes. This is very useful for looking at voltage levels simultaneously with spectral content.
Obviously, this feature should be used when measuring electrical signal, not acoustic signals through the mic.