Metrohm 746 VA Trace Analyzer - Manual (Page 143)

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-58
Method: POL SEGMENT
polaro
Instructions t/s Main parameters Auxiliary parameters
ДДДДДДДДДДДДД ДДДДДДДДДДДДД ДДДДД ДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД
1 DME
2 DPMODE U.ampl -50 mV t.meas 20.0 ms
t.step 0.40 s t.pulse 40.0 ms
3 SWEEP 87.6 U.start 150 mV U.step 6 mV
U.end -1150 mV Sweep rate 15 mV/s
4 ØMEAS U.standby mV
5 END
Modify
column
Modify
line
Delete
instr.
Insert
instr.
Select
segment
Delete
segment
Plot
param.
Segment
name
• The sequence of the segment polaro is explained in brief in what
follows:
Line 1 Switching on the DME (dropping mercury electrode)
Line 2 Selection of the measurement mode DP (differential pulse)
with voltage amplitude –50 mV, voltage step 0.4 s,
measurement time 20 ms and pulse time 40 ms
Line 3 Voltage sweep of 150 mV ... –1150 mV with a
voltage step of 6 mV
Line 4 Switch off voltage, current measurement and DME
Line 5 End of the segment (return to main program)
3 Switch to dialog page "SUBSTANCES"
• Press the yellow key. The dialog page "SUBSTAN-
CES" appears with the parameters for evaluation of substances. Only
one substance Subst1 with standard parameters without an entry for the
characteristic voltage U.verify is defined).
• Press the softkey < >> > . The subpage of "SUBSTANCES" appears with
the parameters for calibration. There is no calibration for the substance
Subst1 ( Technique = none ).
4 Switch to dialog page "CALCULATION"
• Press the yellow key. The dialog page "CALCU-
LATION" appears for calculation of the final results. No formulae are en-
tered.
5 Switch to dialog page "DOCUMENTATION"
• Press the yellow key. The dialog page "DOCU-
MENTATION" appears for the automatic output of reports and curves.
The line entered here has the following meaning:
Curve Smth Sgmt:polaro VR:00 Printout of the smoothed segment
curve
00 on the printer