Metrohm 767 Calibrated Reference - Manual (Page 7)

1 Overview
767 Calibrated Reference Instructions for Use
3
Metrohm electrodes and means that a test can be carried out very eas-
ily:
Screw off cable at electrode plug-in head → plug into Calibrated
Reference → measure
If this check produces a variation from the expected result then it is not
immediately clear as to whether the error lies in the instrument to be
checked or in the cable. Therefore specially labeled cables are avail-
able in the accessories which are included with the instrument; these
can be temporarily used instead of the original cable (see list of cables
chap. 5.2). These accessory cables are also useful for sensors which
do not have a plug-in head.
Note
It must be mentioned here that under no circumstances can or should
the 767 Calibrated Reference replace the periodic maintenance of the
instrument, but should only be used for determining whether an error
is present or not if functional difficulties occur. In addition, the basic
accuracy and high impedance of the instrument can be checked at
regular intervals.
During maintenance the instrument is subjected to a far more strin-
gent check (e.g. linearity of display and A/D converter, etc.). In addi-
tion the switches, motors, mechanical components, etc. are also che-
cked for corrosion and wear and tear.