Metrohm 746 VA Trace Analyzer - 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