Schambeck SFD GmbH
Refractive Index Detector RI2012
RI2012 V1.0 06-2013.EN / 28.10.2013
61
http://www.schambeck-sfd.com
The voltages are calculated according to the following formulas
Summ
=
Smpl + Rfrn
Diff
=
Smpl
– Rfrn
Use a multimeter to check the lamp voltage at the test point on the circuit board. In
both cases the lamp voltage should be set 3.7
0.5 V. You can find a schematic
view of the main circuit board with the marked positions of the test points at the end
of manual.
If the sum voltage is only a few millivolts the light bulb does not work. Check the
power cables of the light source to make sure that they are connected properly. If
needed check the light source (
see chapter 16.4
■
NOTE
Both chambers of the flow cell are filled with the same solvent (without bubbles).
In this case the optical balance should be in a range of 0
20,0 %%.
The sum voltage should be in the region of 5000
25 mV. If this is not the case
adjust the lamp voltage by turning the potentiometer R19 until the sum voltage is in
the region of 5000
25 mV.
Due to the adjustment of the light intensity it is necessary to check the lamp voltage
again. If this voltage is not in the region von 3.7
0.5 V the light source has to be re-
adjusted.
The optical system is adjusted properly if the sum voltage is 5000
500 mV and the
lamp voltage 3.7
0.5 V.
