QSC CXD8.4Q User Manual page 12

Output Screens
Each group of outputs has a dedicated screen. Figure 21 is an example of Outputs A – D.
Output channel identifiers A – D and E – H (not shown).
1.
DAC – when illuminated, this indicates that the signal to the D to A Converter is
2.
larger than can be reproduced and a limiter has been engaged to prevent clipping.
PROTECT – when illuminated, this indicates that the amplifier is in Protect Mode.
3.
Usually due to the power supply going above its thermal threshold.
LIMIT – when illuminated, this indicates the amplifier limiter is active. There are five
4.
conditions that could cause the LIMIT condition:
• Power
• Current
• Voltage
• Temperature
• Loudspeaker Protection is active.
SHORT – when illuminated, this indicates the output is shorted. A short can be triggered by either of the following:
5.
a. Output impedance is below ¼ Ohm for more than 1 second.
b. Output voltage is less than 50% of what the DSP was expecting for more than 1 second.
6. Displays the temperature, in Centigrade, of the associated channel.
A-TD-001522-01
1
12
OUTPUT
A
DAC PROTECT LIMIT SHORT
B
DAC PROTECT LIMIT SHORT
C
DAC PROTECT LIMIT SHORT
D
DAC PROTECT LIMIT SHORT
2 3 4 5
— Figure 21 —
43.05ºC
42.16ºC
43.06ºC
41.05ºC
6