User`s manual

1 - THE QCBOX MODEL 5 POWER AMPLIFIER, SWITCHING AND
TESTING BOX
The QCBOX Model 5 power amplifier, switching and testing box is of invaluable help in
everyday laboratory use and when configuring an automatic or manual quality control
setup.
The QCBOX Model 5 has an ultraslim design, enhanced features as USB connection to
the PC and DC measuring capabilities with respect to its predecessor model 4,
increased power (50W@8Ohm) with respect to its predecessors Model 1, 2 & 3 and
wide range AC (90÷240V) power supply. The power amplifier output current is limited
under software control.
Its main feature is the possibility of internal switching, under software control, that
permits the measurement of the impedance and frequency response of the
loudspeaker (or D.U.T.) connected to its output sockets without changing the
loudspeaker (or D.U.T.) wiring; it is also possible to choose one among four inputs for
the response measurements; the internal switching is controlled via a USB port of the
PC. The inputs 3 and 4 can be also configured to measure DC voltages with range
±2.5V and ±5V respectively.
An internal software controlled voltage generator can superimpose a DC voltage
(±20V) to the amplifier voltage output, allowing for loudspeaker large signal
parameters measurement.
A dedicated output, ISENSE, allows impedance measurements in constant voltage
mode as well voice coil current distortion analysis. The ISENSE DC current is
measured in a range ±2.25A.
A dedicated input, PEDAL IN, permits an external foot pedal switch or TTL signal to be
connected and trigger QC operations.
A DB25 connector on the rear panel feature 5 digital IN and 6 digital OUT.
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