Metrohm 796 Titroprocessor - Manual (Page 272)

13.1 Diagnosis
796 Titroprocessor, Instructions for use 266 266
13.1.9 To check Analog Interface A
With this diagnostic step the analog inputs of Interface A can be checked for their function-
ality. For this test the testbox with article number 1.767.0010 is required.
1. Prepare instrument for diagnostic test (see chap. 13.1.2).
2. <Analog interf.>
Ä On the screen there appears a window with the choice of selecting between analog interface A or B.
3. With the cursor key, mark the letter A to select analog interface A.
4. <ENTER>
5. Connect Simulator to Titroprocessor accord. to Fig. 2.
6. <All inp measure>
Ä The measurements are continuously updated and presented as follows::
Test date: ??-??-?? ??:??:??
Analog input measuring test
!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!
Setting polarizing to: U=300 mV, I=10 uA
Display values as average of 6 meas. cycles
Analog interface A, Calib date: ??-??-?? ??:??:??
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Input 1 : ?x??????? ?.???? mV ?.???? mV/min ?.?? °C
Input 2 : ?x??????? ?.???? mV ?.???? mV/min ?.?? °C
Input Diff : ?x??????? ?.???? mV ?.???? mV/min ?.?? °C
Input Ipol : ?x??????? ?.???? mV ?.???? mV/min ?.?? °C
Input Upol : ?x??????? ?.???? mV ?.???? mV/min ?.?? °C
Fig. 1
7. Check the following measuring values:
column C (see Fig. 1) column E (see Fig. 1)
Input 1 : +U / direct ± 0.4 mV Pt100 ± 0.3°C
Input 2 : +U / 1G ± 0.4 mV
Input Diff : 0 mV ± 4.0 mV
8. Connect Simulator to Titroprocessor accord. to Fig. 3.
column C (see Fig. 1)
Input 1 : +U / 1G ± 0.4 mV
Input 2 : +U / direct ± 0.4 mV
Input Diff : 0 mV ± 4.0 mV
DIAGNOSIS WINDOW
A B C D E