Jenway 6300 Ser Man
13
2.4
Signal Levels
Also see Section 7.2 - Shutter and Filter and 8.3 – Energy
Levels
All analogue signal processing is dealt with on the Detector PCB.
The output from the detector is shown in the Diagnostics mode as a
Voltage, in mV. For more information see Section 5.2 - Detector
Circuit and Section 7.1 – The Diagnostics Mode.
This voltage display can be used to check lamp energy (ageing),
the correct functioning of the IR Stray Light filter as well as the
Dark Shutter.
320nm Energy
, In the Diagnostics Mode (see Section 7.1
Diagnostics Mode) set the wavelength to 320nm, close the Dark
Shutter by pressing the right arrow key. Allow the mV reading to
stabilise and record the stable value.
Open the dark shutter by pressing the right arrow key and the mV
reading must increase by more than 4mV from that recorded above.
If not the lamp should be changed, if it still has not improved then
the condition and alignment of the optical components should be
checked.
Dark Current
, Set wavelength to 320nm, Dark Shutter closed, IR
stray light filter closed, Voltage Display should be zero +/- 6mV.
If not and no light leaks are obvious (damaged seals around sample
chamber, lid not closing fully, damaged or poorly fitted casework
etc) then the detector or detector PCB may be faulty.
720nm Output
, Set wavelength to 720nm, Dark Shutter open, IR
stray light filter open, Voltage Display must not be greater than
3600mV.
If greater than 3600mV check the lamp, lamp supply voltage, other
power supply levels and detector PCB.
