B&K 2250 Light Instrukcja Użytkownika Pobierz pdf (Strona 173)

CHAPTER 14

Reverberation Time Software (Optional Module)

161

14.4 Measurements with Graphical Position Management

The analyzer can keep track of the source and receiver positions in a graphical way together

with the measurements. To do this, make the following settings on the Setup screen:

1) Set Map Based Measurement = Yes in the Measurement Control setup – the reverberation

decays will then be placed graphically on the ‘map’ shown on the Overview tab, and

numbered as source-receiver relations (for example, S1R2 means the decay measurement

with noise from Source 1 and measured at Receiver position 2).

2) Set Meas. All Pos. for Each Source = Yes for measuring all combinations of source and

receiver positions. Set to No, if you want to measure at a specific number of receiver

positions per source.

3) Set No. of Positions per Source to the number of receiver positions you want to measure

per source.

4) Set Increment to Sources First, Receivers First or Manual. Typically Sources First is best

for Impulsive excitation (you can then walk between the source positions and generate the

impulses while the analyzer is placed on a tripod at one receiver position); Receivers First

is best for Interrupted Noise excitation (you can move the analyzer between the receiver

positions, while the sound source remains in the same place).

The Overview tab will then look like Fig.14.11:

Fig.14.11

Overview tab showing

one source and one

receiver position

Note the Add Source and Add Receiver icons on the headline for the map. Tap to

add new sources, and tap to add new receivers on the map.

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B&K 2250 Light Instrukcja Użytkownika Strona 173