Metrohm 746 VA Trace Analyzer - 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