# Bias Measurement

This screen gives you a facility to capture the readings for an Instrument both Manually and Automatically and to calculate the Bias value. You can take simultaneous readings for all the parameters mapped to an instrument. Details of the Channel No., Serial/Parallel Port, and Port No. for the Instrument are also provided.

Reading Mode and Station No. are displayed from the Bias Mapping screen. The current user is displayed as the Operator Code.

For Manual Reading Mode, the Operator Code is used to identify by whom the readings were taken. Channel No. and Port Details (whether Serial Port or Parallel Port, Port No.) are not defined.

For Automatic Reading Mode, Port settings will be displayed based on the selected and connected instrument. If the instrument is connected to a serial port, then the Serial Port value is displayed as Port No. If the instrument is connected to a parallel port, then the parallel port number and the channel to which instrument is connected will be displayed as Port No. and Channel No. respectively.

A grid is provided for taking readings. The first column displays Reading numbers from 1 to ‘n’, where ‘n’ is the number of readings specified in the Bias Mapping screen. The balance columns of the grid are for readings. The number of columns for readings is equal to the number of parameters mapped to the instrument. The readings columns display the parameter names as the headings. e.g. If for the Dumore instrument, 3 parameters ID1, ID2, ID3 are mapped in the Bias Mapping screen, then the Bias Measurement screen is launched with the provision of three column for the reading values. The reading value column headers have names as ID1, ID2, and ID3 respectively.

The Start button is enabled only when the reading mode is Automatic.

Click Modify to make changes. You can modify Channel No. and Port No. only if the reading mode is Automatic. If the instrument selected is connected to a serial port, then you can modify only Port No. If the instrument selected in the study is connected to a parallel port, then you can modify only Channel No.

# Taking Measurements

You can select the Reading No. randomly to take readings.

In Manual mode, you can enter readings directly into the grid for the parameters in the respective columns. You can modify readings only until they are saved.

In Automatic mode, select the row in the grid. Click Start. The readings are displayed in the respective parameter cells when you press the switch on the instrument. Readings displayed in this way cannot be modified.

Click Save to save readings. It is not necessary to enter the total number of readings at one time. A reading must be complete before it can be saved i.e. all parameters mapped to the current instrument must have values. A reading cannot be modified once it is saved.

Click Close to return to Bias Mapping screen. The Last Reading Date, Last Reading Time and Readings Taken are updated for the parameters for which the reading was taken.

See Also: Bias Data Analysis