Metrohm 767 Calibrated Reference User Manual

Page 7

Overview

767 Calibrated Reference Instructions for Use

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.