Metrohm 746 VA Trace Analyzer - Manual (Page 411)

5.7 Program instructions
746 VA Trace Analyzer / 747 VA Stand
5-260
Comments • The PSAMODE measurement mode can be used only with the
electrode types RDE and HMDE and must be employed together with
the PSWEEP instruction.
• The electrode type RDE or HMDE must be entered before the PSAMODE
measurement mode.
• The measurement time t.meas for the measurement of the voltage
drop is divided into 11 windows of different size in which 64 meas-
ured values are recorded each time (resulting in a total of 704 meas-
ured values per segment). The first measurement window has a size
of 2.944 ms, each subsequent window is twice as large as the pre-
ceding window.
• With mercury film electrodes based on the RDE, it is advisable to
deposit the substances with stirring on the electrode. As in the
PSWEEP instruction, only an enrichment without stirring is possible (no
stirring is allowed during measurement), the MEAS instruction must be
inserted. The enrichment time with stirring is defined by its line time,
in general
U.meas = U.start is selected for the measurement volt-
age.
Example see PSWEEP
see also PSWEEP, MEAS, RDE, HMDE