The X4-DE-UN contains the diode array and its electronics as well as the electronics for the integral detectors. Both units are remote controlled via the USB inter­face.
The diode array spectrometer in a compact Czerny Tur­ner design is equipped with a 2048 pixel CCD array. A SMA fiber optic input with collimating, focusing mirror and diffractional grating enable low light level and high resolution light measurement.  
A flexible light guide connects the diode array spectrometer to the BTS detector head.
The integral detector electronics consists of a high sensitivity analog amplifier with switchable gain over a 0.1-100pA to 0.2-200µA measurement range. The 3 ms rise time allows peakvalue data logging for short term mode measurements of LEDs.
A remote controlled switch at the signal input permits operation of up to four detectors in multiplexing mode.
The X4-DE-UN in combination with the X4-BTS detector head is the right tool for general purpose light analysis.
In combination with optional light source amplifiers, stepping motor controller and peltier temperature controller the X4-DE-UN forms the basis for a light source controller set-up for complete control and analysis of discharge and in­can­descent lamps as well as for LEDs, OLEDs and flat panel displays.
Windows based software is  supplied with the X4-DE light analyzer which enables stand alone use as well as system integration.
System integration is supported by the DLL based structure.
The X4-DE-UN is offered in  either a bench-top or rack-mount housing.