DK Digital CDB-600 Specifikace stáhnout pdf (Strana 47)

MSD Software Manual PRELIMINARY Release Chapter 11 1/3 Octave Spectrum Analyser.

To erase both saved FLASH memory locations press the [RESET] key.

The Memory Snap-Shot currently used in the selected Operation Mode is

the one highlighted in the MEMORY Menu.

11.3 Operation Modes for the 1/3 Octave Analyser. 

The 1/3 Band Octave Analyser can be operated in four different modes. Beside

analysing the Input Signal specified by the Audio Matrix, it is also possible to

modify the measured Input signal in relation to the two saved Memory Snap-

shots. The [OP-MODE] Menu is used in conjunction with the [MEMORY]

menu. (See previous section).

To use the Analyser in Normal Mode displaying the analysed results from the

INPUT signal press the [INPUT] key.

Selecting the [I+MEM] or [I-MEM] results in displaying the current

measured Input signal Added (I+MEM) or subtracted (I-MEM) with the selected

Memory Location.

To temporarily display the content of the selected Memory Location press the

[TMEM] key. This key can be used to verify any stored measurements.

11.4 Using the Freeze Function. 

To momentarily freeze the Analyser display the [FREEZ] key can be selected.

This function can be very useful when a non-continue Input signal have to be

saved before further analysed, such as being modified with a measurement

previously saved in one of the two memory locations.

Note: The freeze function is cleared when the Analyser Menu is exited.

11.5 Using the Gain Function. 

To maximise the dynamic area of the Analyser the Input signal can be amplified

up to +20dB using the [GAIN] arrow keys [] / []. This function is mainly

used for two different applications. One is to “normalize” a measurement in

such a way that an actual measured average level for a specific band (or

band’s) is set to match a predefined level on the Meter Scale. An example is to

set the GAIN until the average level of a given band is around the 0dB mark on

the scale. The Actual measured average value can now be determined by

subtracting the entered Gain value from 0dB.

Another useful application for the Gain function is to be able to measure very

low level signals. Typical the noise level of a system. By applying the total of

+20dB Gain on the Input Signal it is possible to analyse signals levels down to

-74dBu.

The scale used by the 1/3 Band Octave Analyser follows the one selected

for the PPM Meter. Please see section x.x in this manual on how to

change scale.

Please note that if using the VU and LEQ(m) scales which both have a

very long integration time the 1/3 Octave Analyser will not work properly.

PRELIMINARY Release Page 43 of 64.

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DK Digital CDB-600 Specifikace Strana 47