Larson Davis 824 User Manual

9/29/09 RTA (optional) 11-17
RT60-A and RT60-B Instrument Definition
The RT60-A Setup is configured for
the use of a steady-state noise source
which is shut-off to initiate the
decay. The RT60-B Setup is
configured for the use of a noise
burst such as a balloon bursting.
The System 824 contains two special RTA IDs on the setup
menu which will simplify making an RT60 measurement.
Both of these setups load the RTA instrument but with the
triggering, arm, and end menus configured for two types of
measurements.
The RT60-A and RT60-B RTA instruments are accessed
from the
S SETUP key.
RT60-A
Although the settings are predefined
in RT60-A and RT60-B, they can be
changed at any time and used as
customized setups for a personalized
RT60 measurement.
The RT60-A setup is designed to gather data to measure an
RT60 by exciting a room with a steady state noise. It is
configured in the following way:
• Detector: Linear
• Detector Time: 0.01 seconds
• Autostore: Yes
• PreTrigger: 50
• Save ByTime: Yes
• Triggering: Yes
• Trigger Source: 1 kHz
• Arm Mode: L >
• Arm Level: 80.0 dB
• Arm Time: 2.0 second
• Trigger Mode: L <
• Trigger Level: 80.0 dB
• Trigger Time: 00.0000 seconds
• End Mode: Time
• End Time: 3.0 seconds

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English