Metrohm 756 KF Coulometer - Manual (Page 141)

7.3 Coulometer validation, GLP mode
756/831 KF Coulometer, Instructions of Use 133
7.3 Coulometer validation, GLP mode
Checking and maintenance of the Coulometer is carried out in 3 steps:
1. Testing the electronic components when the Coulometer is switched on.
2. Wet-chemistry validation of the whole coulometric analysis setup
3. Maintenance and adjustment of the Coulometer by Metrohm service.
7.3.1 Electronic tests
When the Coulometer is switched on electronic tests are carried out. During this period
system tests
appears in the display.
The tests are documented in the system test report, which can be printed out when the
Coulometer is switched on (see page 19):
'di
756 KF Coulometer
01109 5.756.0010
user Boss
date 1998-10-27
time 08:54
RAM test OK
real time clock OK
A/D converter OK
LCD display OK
COMPorts OK
EPROM test OK
============
Contact Metrohm service if one of these tests is "not OK".
If the "real time clock" test is not ok, you can try to set date
and time again. If the test is OK afterwards you should
check whether your stored methods have remained un-
changed.