Metrohm 746 VA Trace Analyzer - Manual (Page 382)

5.7.3 Alphabetical instruction list
746 VA Trace Analyzer / 747 VA Stand
5-231
Adjustable parameters:
DPMODE
t.step
t.meas
t.pulse
U.ampl
SWEEP
U.start
U.end
U.step
F (Hg)
t.drop
t
U
t
U.step
U.start
I
U
t.meas (I
1
)
U.peak
I.peak
U.ampl
t.step t.pulse
t.meas (I
2
) t.meas (I
1
) t.meas (I
2
)
I = I
2
- I
1
Comments • The DPMODE measurement mode can be used with all types of
electrodes together with the instructions MEAS , SWEEP , DSWEEP ,
FSWEEP or TSWEEP .
• The electrode type DME , SMDE , HMDE or RDE must be entered before
the DPMODE measurement mode.
• If the DPMODE measurement mode is used with the voltage sweep
SWEEP and the electrode type HMDE , the potentiostat normally oper-
ates in the operating mode "slow". A switch is made to the operating
mode "fast" when the pulse time
t.pulse < 30.05 ms.
• If the DPMODE measurement mode is used with SWEEP and the
electrode type SMDE or DME , the setting of the potentiostat depends
on the measurement profile. Normally, a switch is also made from
"slow" to "fast" when the pulse time
t.pulse < 30.05 ms. With very
small signals, however, the operating mode "slow" is used and with
very large signals the operating mode "fast", irrespective of the pulse
time.
• If the DPMODE measurement mode is used with the voltage sweep
SWEEP and the electrode type RDE , the potentiostat always operates in
the operating mode "fast".
• If the DPMODE measurement mode is used with the voltage sweep
FSWEEP , the potentiostat always operates in the operating mode "fast".
This mode is recommended especially for adsorptive stripping tech-
niques (e.g. Ni and Co with DMG).
• The quantity t.drop important for the definition of t.step depends
on the type of electrode selected:
DME t.drop = 20 ms
HMDE and RDE t.drop = 0 ms
SMDE t.drop = Drop.size ×× 40 ms
see also SWEEP, FSWEEP, DME, HMDE, SMDE, RDE
Area (Hg)