Software Instruction Manual

IQ–MSD Turbo 1.4 Advanced IQ System Software
Page 118
5.2 Monitoring an Amplifier
We will skip over the controls for now and focus on the monitor area of the amplifier control block. Several ways
are provided to monitor an amplifier.
5.2.1 Monitoring from a Control Block
The most basic monitor capability is provided in the monitor area of each amplifier control block. Using control
blocks you can monitor up to four amplifiers at a time because each Control Block screen displays four of them.
Here are the items you can monitor:
In: A numeric readout of the relative input signal level of each amplifier channel. It is sensed at the balanced gain
stage of the amplifier. The indicator can report a range from 0 to –50 dB. Legacy IQ P.I.P.s: A reading of 0 dB
equals approximately +16 dBu. IQ2 P.I.P.s: A reading of 0 dB equals 0 dBu.
Out: A numeric readout of the relative signal level of each amplifier output channel. The indicator can report a
range from 0 to –50 dB. A reading of 0 dB is the maximum peak output level of the amplifier into an 8 ohm load. The
level numbers displayed represent the dB level below the 0 dB reference. Note: The Out level must be properly
scaled for each amplifier model or else it will display an incorrect level. Some older legacy IQ P.I.P.s use scaling
resistors that must be configured when the P.I.P. is installed into the amplifier. Most IQ2 P.I.P.s are scaled by
software with the amplifier Model setting in the information area of the control block.
IOC: This indicator mimics the IOC (Input/Output Comparator) indicator LED on the front of the amplifier. As long
as distortion (of any kind) does not exceed 0.05%, the indicator of each channel will read “Ok”. However, if
distortion ever exceeds 0.05%, the indicator will read “IOC” to alert you that the amplifier channel is beginning to
distort. See your amplifier’s Reference Manual for more information about IOC.
ODEP: A numeric readout of the Output Device Emulation Protection status of each amplifier channel. It is
displayed as a percentage. Subtract the reading from 100% to find the remaining thermodynamic energy
headroom. When ODEP displays “100,” the amplifier has reached its maximum heat dissipation capacity for its
operating environment and ODEP limiting will begin. See your amplifier’s Reference Manual for more information
about ODEP.
5.2.2 Monitoring from a Display Screen
A more graphical way to simultaneously monitor six or eight amplifiers is with the Display screens. There are two
versions, a 6-Bar and an 8-Bar Display screen. The only difference between them is that the 8-Bar version uses
narrower columns, allowing two more amplifiers to be displayed than the 6-Bar version. Use
@ and # to
access them from the Control Block screen. The 6-Bar Display screen is shown in Figure 5.5 and the 8-Bar
version is shown in Figure 5.6. To leave a Display screen, press
X or !. This returns the display to the
Control Block screen.
The Sel (Selected) control in the control block of each amplifier determines if it will appear in the Display screen.
All amplifiers will be available to the Display screens if no Sel controls are turned on. If more amplifiers have been
selected than can be displayed at one time, use
Q and R to scroll through them.