41
TEST PROCEDURE
12. Frequency Response Test
12.1 Rotate the channel 1 Trim control to maximum (fully CW). Apply a balanced 1 kHz, -41dBu sine
wave to the channel 1 XLR input. Reference a dB meter to the output at the 1/4” TRS Main Output L and
R jack.
12.2 Change the input frequency to 20Hz. Measure the output level at the 1/4” TRS Main Output L and R
jacks. Verify that the output level is 0.0dBr +/-0.5dBr.
12.3 Change the input frequency to 20kHz. Measure the output level at the 1/4” TRS Main Output L and
R jacks. Verify that the output level is 0.0dBr +/-0.5dBr.
12.4 Repeat steps 12.1 to 12.3 for the remaining inputs.
13. THD+N Test
13.1 Place all unmeasured input Trim controls to minimum.
13.2 Rotate the channel 1 Trim control to maximum (fully CW). Apply a balanced 1 kHz, -41dBu sine
wave to the channel 1 XLR input.
13.3 Measure the THD+N level at the 1/4” TRS Main Output L and R jacks. It should be <0.05%.
13.4 Repeat steps 13.1 to 13.3 for the remaining inputs.
14. Noise Test
14.1 Rotate the channel 1 Trim control to maximum (fully CW). Apply a balanced 1 kHz, -41dBu sine
wave to the channel 1 XLR input.
14.2 Measure the Noise level at the 1/4” TRS Main Output L and R jacks. It should be < -75dBu.
14.3 Repeat steps 14.1 to 14.3 for the remaining inputs.
XLR Inputs 1 - 4 to Digital Main Output L and R Tests - T4S only
IMPORTANT NOTE: Tests 15 and 16 require a digital dB meter, such as an Audio Precision ATS-1 Dual
Domain, an ATS-2 or an APx515. If you do not have this equipment, you may simply connect the T4S
Digital Main Output to a Bose
®
L1 Model II or L1 Model 1S power stand with the arrays installed and
verify that you can pass audio through the T4S and hear it clearly from the power stand in place of tests
15 and 16. The digital output from the T4S is a SPDIF output that is converted to analog audio by the
power stand.
15. Gain Test
15.1 Rotate the channel 1 Trim control to maximum (fully CW). Apply a balanced 1 kHz, -41dBu sine
wave to the channel 1 XLR input.
15.2 Measure the output level at the Ethercon Main Output L and R jacks. It should be -7.4dBFS
+/-0.5dBFS.
15.3 Repeat steps 15.1 and 15.2 for the remaining inputs.
To Next Page
Loading...
Need help?
General
