Metrohm 746 VA Trace Analyzer User Manual
Page 421
5.7 Program instructions
746 VA Trace Analyzer / 747 VA Stand
5-270
Description
The
RAMP
instruction starts the voltage ramp defined in the parameters.
U
t
U.start
U.end
U.step
t.step
Comments
•
The electrode type must be defined before the
RAMP
instruction.
Admissible are
HMDE
or
RDE
.
•
The measurement mode must be defined before the
RAMP
instruc-
tion. Admissible is only
CYCMODE
.
•
The
RAMP
instruction must always be located within a CSWEEP
block. Maximum 5
RAMP
instructions are allowed.
•
Apart from the
RAMP
instructions, no other SWEEP instruction is
allowed in the same segment.
•
If the final voltage
U.end
should not be switched off at the end of the
program, enter a suitable standby voltage
U.standby
in a
ØMEAS
instruction.
•
Within a CSWEEP block a wait time between two ramps can be
programmed only by insertion of an additional, slow ramp as flat as
possible.
Examples
Cyclic voltammetry of Pb and Cd at the HMDE:
Method: cv SEGMENT
CdPb
================================================================================
Instructions t/s Main parameters Auxiliary parameters
––––––––––––– ––––– ––––––––––––––––––––––––– –––––––––––––––––––––––––
1 HMDE Drop size 2 Meas.cell normal
2 CYCMODE I.range 1.4 uA Prep.cycles 2
Meas.cycles 5
3 (CSWEEP
4 RAMP U.start -100 mV U.step 10 mV
U.end -900 mV t.step 0.10 s
Sweep rate 100 mV/s
5 RAMP U.start -900 mV U.step 10 mV
U.end -100 mV t.step 0.10 s
Sweep rate 100 mV/s
6 CSWEEP)
7 END
.
see also
CYCMODE, (CSWEEP, CSWEEP), HMDE, RDE