QSC CM16a Manuel télécharger pdf (Page 7)

FUNCTIONS, BLOCK DIAGRAM & DETAILED DESCRIPTIONS (CONTINUED)

AUDIO MONITOR CHAIN FUNCTIONS

Pre-Fader Monitor- Monitors the audio path at the point before the Level Control block (i.e. the input to the CM16a).

Post-Fader Monitor- Monitors the audio path at the point after the Level Control, Mute, and Polarity blocks (i.e. the output from the CM16a).

Amplifier Monitor- Monitors the audio at the output of the amplifier (i.e. the speaker terminals of the amplifier).

Off- This selection disconnects the monitor for the channel.

Level Adjust- Provides adjustment of the signal level delivered to the Monitor Module from each of the selectable “tap” points of a channel’s audio

path. Adjustment is from -95.5dB to 0dB in 0.5 dB steps.

Monitor Module- This module functions as a four-input mixer with software selection of the input channels. The four selected channels are summed

with the external input, Monitor Chain In. For each of the inputs, the “tap” point is selectable from the pre-, post-, amplifier and off positions.

AMPLIFIER CONTROL FUNCTIONS

Standby/ Operate- Controls the amplifier’s power status-

ON- amplifier operational

STANDBY- amplifier in standby mode

NOTE! The amplifier must be powered in order to respond to any commands issued by the CM16a. This means the amp’s

power switch must physically be in the ON position.

AMPLIFIER MONITORING FUNCTIONS

Amplifier Model Detect- Identifies what model of QSC amplifier is connected to the CM16a’s DataPort.

Amplifier Gain Detect- Reports the setting of the amplifier’s gain setting (in dB) for each channel.

Bridge Mode Detect- Detects the position of the bridge mode switch on each amplifier.

Clip Detect- Detects amplifier clipping on each channel.

Headroom Metering- Reports the “available” remaining signal level that the input signal can be driven before clipping will occur.

Heat Sink Temperature Metering- Monitors the heatsink temperature of each channel of each amplifier connected to the CM16a. If the tempera-

ture exceeds a user specified value (in software) then the Over-Temp. “object” will alert the system operator.

Load Monitor Detect- Monitors the impedance of the load at the amplifier output for each channel.

Output Current Meter- Provides for metering of the amplifier’s output current on each channel.

Output Voltage Meter- Provides for metering of the amplifier’s output voltage on each channel.

Output Open Detect- Detects when the load connected to the amplifier is above a user specified value in software.

Output Short Detect- Detects when the amplifier load is below a user specified value in software.

Power Status Detect- Reports AC power status of the amplifier (ON/standby/ OFF).

Protect Status Detect- Reports if the amplifier has entered “protect” mode (such as thermal, over-current or power-up muting protect status).

Real Power Detect- Reports the “real” power the amplifier is delivering. This “real” power is not the same as “reactive” power. Real power is the

product of current and voltage times the cosine of the phase angle between them.

Threshold Adjust- This indicates that the behavior of the associated block requires the input of a threshold value in software that must be crossed

for the detection to occur. This allows the system operator to tailor the behavior of the system to each application.

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QSC CM16a Manuel Page 7