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

11.1.1 Response time for the 1/3 Octave Analyser.

 

The analysers response time is set by the [RESPONS] key. Pressing this key

opens a new menu from where it is possible to enter the response time from

125 milli seconds to 1000 milli seconds in steps of 125 milli seconds.

11.1.2 Measuring modes.

 

To measure the maximum output level from any of the 30 bands over time, the

[TRACK] function combines this feature together with the standard display

mode. When engaged the maximum output from each band will now be

displayed as a purple coloured bar behind the normal ‘live’ bar.

Combined with or separate from the TRACK function the Analyser also have a

normal "flying" peak indicator with a very long release time (holds the peak

indicator for approximate 2 seconds). The [PEAK] function can also be used in

conjunction with the [HOLD] function enabling a classic Peak/Hold function.

The displayed peak indicators can be cleared by pressing the [CLEAR] key.

Both the [HOLD] and [CLEAR] functions can only be used when the [PEAK]

function has been selected.

11.2 Measurement ‘Snap-Shot’s’ of the 1/3 Octave Analyser.

 

Adding a Memory Function to the 1/3 Octave analyser greatly expands the

usability of the analyser, giving the user the power of saving actual

measurements and using these again as reference for new measurements.

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

(See next section).

To save a measurement, first select the memory number [MEM 1] or

[MEM 2]. Then press the [PRESET] key to store the current measurement.

The stored values are “SNAP-SHOTS” taken at the exact time the [PRESET]

key has been hit.

Just like a preset the two Memory locations are saved in the FLASH Memory.

The memories save the content even after a power down. When entering the

1/3 Band Octave Analyser these two Memory “presets” are loaded into normal

working memory of the MSD. This memory will however NOT be saved when

leaving the Analyser. Since the [SAVE] key saves the measurement into this

memory, any stored measurements done with this function will be lost when

leaving the Analyser Menu.

As opposed to the [SAVE] key the [PRESET] key will save the snap-shot into

the FLASH memory. The [SAVE] function will normally be used when the two

memory locations already contain valuable data used by the operator, and the

need of an additional temporary snap-shot is present. In such a case the

[SAVE] key will temporary overwrite the Memory locations, but only until

exiting the Analyser Menu. When entering the Analyser Menu again the FLASH

saved memory snap-shots created by the [PRESET] key will once again be

ready for use.

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