Metrohm 746 VA Trace Analyzer User Manual
Page 439
5.7 Program instructions
746 VA Trace Analyzer / 747 VA Stand
5-288
Comments
•
Within a program, the SMDE is not switched off until an
ØMEAS
instruction or selection of a different electrode type (
DME
,
HMDE
or
RDE
). The SMDE is also switched off by
END
in the main program on
the "OP.SEQUENCE" page, but not by
END
in the segment.
•
The SMDE can be used for the following measurement modes and
sweeps:
DCTMODE
with
SWEEP
and
SSWEEP
,
DPMODE
with
SWEEP
and
FSWEEP
,
SQWMODE
with
SWEEP
and
FSWEEP
,
AC1MODE
with
SWEEP
and
AC2MODE
with
SWEEP
.
•
The following are not compatible with the SMDE:
CYCMODE
with
(CSWEEP
,
PSAMODE
with
PSWEEP
as well as
TSWEEP
.
•
An advantage of the SMDE compared with the DME is its greater
sensitivity as the electrode surface and hence the baseline remains
constant during the measurement. Further, less mercury is needed.
On the other hand, the MME capillary is subjected to greater me-
chanical stress than in the DME case.
•
A disadvantage of the SMDE compared with the HMDE is the higher
mercury consumption, in addition the MME is subjected to greater
mechanical stress.
see also
DME, HMDE, RDE