1. Intended application
The Qam measurement amplifier is designed
to power sound sources and electro-dynam-
ic shakers. The amplifier is intended for in-
door use, but can be used outdoors as long
as it is protected against rain, excessive
dust, etc.
The standard version Qam will have a signal
generating module for use with Qohm, Qm,
etc. sound sources. A remote control allows
activation and deactivation.
A special version QamS lacks the signal and
remote function, and is intended as a slave
unit only, to increase the total power out-
put.
The Qam amplifier will generate low crest
factor random noise signals for measure-
ments, and amplify any reasonable external
signal. Different modes and equalization set-
tings are available:
–
Continuous operation, or 20
seconds pulsating mode
–
White and pink noise
–
Sound source specific equalization
–
Low frequency tuning in third
octave bands
The internal noise signals are crest factor
optimized to allow a higher output level
from the connected source and from the
amplifier. This may sound unnatural or distorted. But it is normal and it is the undistorted
low crest factor noise signal.
Externals signals of different nature can be used like; sine and chirps, random noise, mu-
sic or other communication signals. But it is the responsibility of the user to choose feas-
ible and safe signals for the amplifier and its attached source or shaker.
2. Positioning, connections and powering
Do not place any objects on top of the amplifier. The upper surface is needed for cooling
and can sometimes become very warm when the amplifier has been active or stand-by
over a longer time. This is normal and related to the high power density electronics in
the amplifier. There is an overheat protection in the amplifier which will light up an LED
in the display only when a critical temperature is attained.
When used in an environment >30degrees - <50 degrees Celsius, the total operating
time may be limited. In such cases it is advised to turn the amplifier off when not being
used or to add external cooling for a longer operation time.
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