SP395 SoundPro Audio Integrator Form7492 Operation Manual
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3. Source Memory – Selects the memory location of the RTA screen captured on the sound
source side of the partition.
4. Receive Memory – Selects the SP395 memory location of the RTA test captured on the
sound receive side of the partition.
5. Memory Type – Indicates if the selected memory originated from the SP395 RTA, FFT,
Sweep or other functions. The Transmission Loss test requires RTA memories for proper
analysis.
6. Test Measurement Value – Indicates the value of the test result for the standard
measurement selected.
Transmission Loss test operation
The Transmission Loss test requires performing the RTA test on both the signal source side and
receiving side of the partition. The RTA tests should be stored to memory locations using the
bottom toolbar of the SP395. Then switch to the Transmission Loss Test and enter the stored
memories containing the RTA test results both on the signal source side of the partition and
receive side of the partition.
To perform the Transmission Loss Test:
1. Setup. Set up the source room with an amplified speaker. Place the microphone
approximately 1 meter from the partition.
2. Apply Noise Source. Generate a sufficient sound level (pink noise) in the room.
3. Saving the source room RTA. Select the RTA test function on the SP395. Setup for a 1/3
octave RTA. Store the RTA test results to a memory location using the bottom center
toolbar. Note: Make sure that the averaging time on the RTA is slow enough that the
display is not visibly bouncing around. If you wish, use Avg (Average) mode to average
the results in multiple locations before storing the curve. Note the memory number for
later entry into the Transmission Loss test screen. (Example: Memory 1)
4. Save the receiving room RTA. With the sound generator still running at the same level,
move the microphone to the other side of the partition. Like before, store this 1/3 octave
RTA into a memory. Note this memory number for later entry into the Transmission Loss
test screen.
5. Perform Transmission Loss Analysis. (This part of the analysis can be done off-line, as
it uses the memories stored above). Go to the Transmission Loss function and select the
desired measurement, STC, RW, or OITC. Now select the source room RTA memory as
Memory 1, and the Receiving room memory as Memory 2.
6. Read the test result. The Transmission Loss test result is displayed in the bottom center
just above the bottom toolbar.
Note: (Refer to ASTM 90 standard for full details on transmission loss testing.)
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