Schambeck SFD GmbH
Refractive Index Detector RI2012
RI2012 V1.0 06-2013.EN / 28.10.2013
66
http://www.schambeck-sfd.com
17 V
OLTAGE
T
EST
P
OINTS
The following list contains different test points on the main circuit board of the RI2012
refractive index detector.
All voltages listed below are measured in relation to Ground GND or AGND. Both are
connected to the instrument’s housing through the holding screws on the circuit board.
Check the serial number of you instrument (
see chapter 15.1
) to locate the test points on
the board. The figure on page
Fehler! Textmarke nicht definiert.
shows the board used in
instruments if the 0312xxx series. The figure on page
Fehler! Textmarke nicht definiert.
shows the board used in instruments of the 0401xxx series.
GND
digital ground
AGND
analog ground
Uncontrolled voltages
Ud*
10.8 V
for RI2012 with serial number up to SN 0212220
11.3 V
for RI2012 with serial number from SN 0212221
Stabilized voltages
Vcc
controlled voltage for digital circuits
U
Lmp
controlled lamp voltage
U
ref
or TP14
reference voltage for the A/D-converter
Test point
Voltage
Adjustment
Vcc
5.0 V
-
U
Lmp
2.5 to 5.1 V
Potentiometer R19
+12 V
+12 V
-
-12 V
-12 V
-
+5 V
+5 V
-
-5 V
-5 V
-
Uref or TP14
2.5 V
-
