Jenway 6300 Ser Man
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4.1
Light Source
The 6300 uses a single Tungsten Halogen lamp to cover the full
wavelength range from 320 to 1000nm. This is a pre-focussed lamp
selected for the accurate position of the filament, making re-
alignment after replacement unnecessary.
The use of lamps other than those supplied by Jenway Ltd (part
number 012 075) will cause error codes to be displayed and result
in erroneous results. See Section 4.2 of the Instruction Manual.
4.2
Grating
From the lamp the light passes through a slit and lens assembly
then onto a flat holographic grating with 1200 lines per millimetre.
The grating is directly coupled to the stepper motor, which is under
microprocessor control. An opto-coupler mounted just behind the
grating acts as an ‘end stop’ when the sensor vane connected to the
grating mount blocks the light path across it.
4.3 Shutter and Filter
The diffracted spectrum then passes through a further slit and lens
arrangement after which the light beam can be blocked by a shutter
switched in and out by an electronically operated solenoid.
Before passing into the sample chamber the monochromatic light
passes through an infra-red filter when wavelengths below 360nm
are selected. Similar to the shutter this filter is switched in or out by
an electronically operated solenoid under microprocessor control.
.
4.4 Signal Detector
An S1133 photo-diode is used as the detector on the 6300, it is
mounted directly onto the detector PCB, behind the lens block
The detector PCB carries out all of the analogue signal processing,
including the A to D conversion, and has its individual calibration
data stored in an on-board E
2
PROM. For more information see
Section 5.2 – Detector Circuit.
