Settings for measurement and data plotting can be defined in the menu "Settings".
If the option "autoload options" is active, all parameters are read from the configuration file at program start.
If the option "autosave options" is active, all parameters are saved in the configuration file at program end.
Function parameters, which are defined in project or data channel settings, will be overwritten during the measurement, if the device is sending these data.
Galvani options can be classified as:
In the project settings the main measurement parameters are defined:
For both channels these measurement functions ca be selected:
In channel 1 (x-axis) the time variable can also be selected - this is the default option.
Galvani selects the unit (volt, ampere, ohm, siemens, pH, °C) according to the defined function.
If the data sent by the device contain a function and a unit, project or channel settings are overwritten.
Project settings are also overwritten when a simulation pH or spectrum is selected.
With simulation spectrum the function wavelength (400-800 nm) is selected for x-axis and absorption (intensity) for y-axis.
Together with the measurement function the related device e.g. simulation type is shown. A click on this button leads to the settings menu where the related device can be configured.
For simulation of titration curves the convenient acid can be chosen from a dropdown list. The user can fill in the acid volume an concentration, the concentration of the titrator (sodium hydroxide) an the titration velocity.
A value of 50 mL/min with a time interval of 0.1 seconds is suitable.
For the calculation of titration curves Galvani uses the tabulated pKs-values (H.R.Christen: Grundlagen der allgemeinen und anorganischen Chemie, Frankfurt a.M. 1980, G.H.Aylward, T.J.V.Findlay: Datensammlung Chemie, Weinheim 1975).
The algorithm is based on the concept of de Levie (R. de Levie: "General expressions for acid-base titrations of arbitrary mixtures", Washington 1995 - Technical report #7, Chemistry Department, Georgetown).
Diagram settings can be selected in menu Settings/diagram.
Background
A mouse click on the area opens a colour selection window where the background colour can be chosen.
Colour of axes
A mouse click on the area opens a colour selection window where the axes' colour can be chosen.
Grid
Turn on the switch to show the grid.
A mouse click on the area opens a colour selection window where the grid colour can be chosen.
Data points
To define the appearance and the junction of data points, these options can be chosen:
Scaling
Turn on the switch for autoscaling the diagram coordinates. Another switch forces the zero line to be shown.
The limits of the coordinate system can be adjusted manually in the appropiate entry fields.
If the switch "autoscale" is on, the coordinate system is adjusted to actual data based on the manually defined.
Project title
Turn on the switch to show the project title as headline of the diagram.
Parameters for data channels can be selected in menu Settings/Data channel X / Y.
Most options are identical for both data channels.
The time variable can only be selected for channel 1 (x-axis). Other devices than digital multimeters can be chosen only for channel 2 (y-axis).
Data source
The time variable is the default function for channel 1.
In addition there are the following options:
Measurement interval
The measurement interval (the time difference between two measurements) can be chosen up to a maximum of 1 hour (3600 seconds).
The minimum is defined by the multimeter or device (parameter "timeout").
Choose the measurement interval in the selection window for channel 2 (y).
Data source simulation
This option allows the simulation of measurements. The user can define special simulation parameters or let galvani create them (auto).
Galvani modulates the calculation of data with random variables.
The following functions are available:
Data source digital multimeter
Galvani supplies configuration files (extension .dmm) for some devices. They can be found in the user's Galvani data directory ~/galvani/.
This version of Galvani supports only devices sending ASCII data. Galvani supports although communication by SCPI commands (Standard Commands for Programmable Instruments).
With the Load button the device settings are read from a configuration file and saved in a list of up to 10 devices.
Configured devices can be selected for measurements on both channels.
Manually configured parameters can be saved as files by clicking on the Save button.
Parameters for serial communication:
Data source device
Besides digital multimeters other measuring devices with serial communication can be used in Galvani. The device being chosen only the interface must be selected.
This version of Galvani supports the following devices: