Metrohm 746 VA Trace Analyzer User Manual

Page 239

5.5 Operation

746 VA Trace Analyzer / 747 VA Stand

5-88

Parameter

Range; Default value / Meaning

red. fitting prec.

Unsatisfactory matching of the non-linear
calibration curve.

VR.

display only

Variation and replication

Per variation and replication, all single measurements are numbered
consecutively from 0...8 (

std.add.

) or 0

…

9 (

cal.crv.

Variation (standard addition or parameter variation)

Replication (repeat)

Each single measurement can be suspended or reactivated for
subsequent calculations with the softkey

Suspended measurements are marked by the character

positioned

next to the VR number.

U/mV

display only

Peak voltage or half-wave voltage (variable EU::)

Peak voltage

U.peak

determined for the single measurement in mV.

With measurements recorded with DCTMODE (SWEEP) or
AC2MODE, the half-wave voltage

U/2

is shown here in mV.

The mean value of the peak voltages for all replications of a variation
can be used in formulae as

EU::

(

= substance

name;

= variation) for further calculations. It should be noted that

this value is put out in such cases in the base unit V without prefix
(see section 5.6.4).

I/xA, P/xW,
t/xs

display only

Evaluation quantity

Evaluation quantity determined for single measurement with unit (A,
W, s). Depending on the selection of the measurement mode and

Quantity

on the "SUBSTANCES" page, the following is shown here:

I/xA

Peak current

I.peak

for DPMODE, SQWMODE,

AC1MODE, AC2MODE, DCTMODE (SSWEEP) with

Quantity = I.peak

, or wave current

I.wave

for

DCTMODE (SWEEP) (in A, mA,

A, nA, etc.)

P/xW

Peak area

P.peak

for DPMODE, SQWMODE, AC1MODE,

DCTMODE (SSWEEP) with

Quantity = P.peak

(in W,

mW,

W, nW, etc.)

t/xs

Peak area

t.peak

for PSAMODE (in s, ms,

s, etc.)

I.mean, P.mean,
t.mean

display only

Mean value of evaluation quantities (variable EV::)

Mean value of the evaluation quantities of the single measurements in
replications. Depending on the selection of the measurement mode
and

Quantity

on the "SUBSTANCES" page, the following is shown

here:

I.mean

Mean value of the peak current

I.peak

for DPMODE,

SQWMODE, AC1MODE, AC2MODE, DCTMODE
(SSWEEP) with

Quantity = I.peak

, or mean value of the

wave current

I.wave

for DCTMODE (SWEEP) (in the

same unit as for

)

P.mean

Mean value of the peak area

P.peak

for DPMODE,

SQWMODE, AC1MODE, DCTMODE (SSWEEP) with

Quantity = P.peak

(in the same unit as for

)