Extron Electronics MLA VC10 Plus User Guide - Manual (Page 15)

Measuring the Biamp Precedence CMA 60 control voltage
Several Biamp amplifiers have three screw terminals labeled “remote level.” The terminals,
shown in the inset in figure 5, are reference (+10v), ground ( ), and control voltage (C).
Use a voltmeter to measure the voltage between the control terminal and the ground
terminal as shown in figure 5. Record the measured voltage and which terminal is ground.
Figure 5. Biamp Precedence CMA 60
NOTES: • For three-terminal amplifiers, always connect the MLA VC10 Plus to the
control voltage terminal and ground terminal on the control port of the
amplifier. Leave the other terminal (+10V in this example) unconnected.
• The MLA VC10 Plus provides a variable control voltage (supply voltage) of
0 to 10 VDC. The MLA VC10 Plus can control amplifers that use a higher
control voltage. However, in this situation, the maximum volume may not be
reached.
Connections for volume control by variable DC voltage
This example shows an amplifier that requires a maximum output voltage of 10 VDC.
ATTENTION: Be certain you know the maximum control voltage for your amplifier.
If the voltage from the MLA VC10 Plus exceeds the maximum control
voltage of the amplifier, the amplifier can be damaged.
1. Connect the USB port of the MLA VC10 Plus ( d in the Front Panel diagram on
page 3) to a computer with the Extron DataViewer software installed.
NOTES: • See “ Software Installation ” on page 18 for information about
downloading and installing DataViewer on your computer.
• Whenever possible, Extron recommends configuring the MLA VC10 Plus,
before connecting the unit to the amplifier.
• For a complete description of SIS commands , see page 31.
2. If necessary, use the following SIS command to set the MLA VC10 Plus control mode
to voltage:
E M*1VLCM }
MLA VC10 Plus • Installation and Cabling 9