Laurel-electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER Manual de usuario descargar pdf (Pagina 70)

19. CUSTOM CURVE LINEARIZATION

Curve.exe is a DOS-based, executable PC

program used to set up an Extended meter

so that the readings have a user-defined,

non-linear relationship with the input signal.

For example, it allows a meter to correct for

non-linearity of transducers, or to display

volume from pressure at the bottom of an

irregularly shaped tank. The linearizing para-

meters are downloaded into non-volatile

memory of the meter. The curve fitting algo-

rithm is uses quadratic segments of varying length and curvature, and provides diagnostics to

estimate curve fitting errors. The program is self-prompting, avoiding the need for a manual.

PREREQUISITES

1) PC-compatible computer with an available RS232 or USB port.

2) Extended meter*.

3) A serial communication board in the meter. This

board can be removed following meter setup.

4) A suitable cable to connect the meter to a PC.

5) Curve.exe software (downloadable at no charge).

GETTING STARTED

Download curve.exe into the same directory that will contain your data files, such as

c:\curves. Set the meter to custom curve linearization. To do so, press the key to get to

ConFG, then set the fifth digit to 1. This digit will only be displayed with an Extended meter*.

Set the meter baud rate to 9600. To do so, press the key to get to SEr 1, then set the

entry to __050. Set the meter address to 1. To do so, press the key to get to SEr 2, then

set the entry to _0011. To execute the program from Windows, simply double-click on

curve.exe. No software installation is required.

OPERATING MODES

The program will prompt you to enter your data in one of four modes. Pressing R (Enter) at

any time returns you to the main menu.

1) Text file entry mode, with an X value in one column and a Y value in another. There

can be additional columns, which are ignored. The file must have a DOS name of up to

8 characters and the extension .RAW. There can be from 5 to 180 rows. X is the input

value and should be in the unit of measure for which the meter was set up, such as mV,

V, mA or A. Y is the desired corresponding reading and can range from -99999 to

99999 with any decimal point.

2) 2-coordinate keyboard entry mode, where an actual X input signal is applied, and the

desired Y reading is entered from the keyboard.

3) 2-coordinate file entry mode, where an actual X input signal is applied, and the

desired Y reading is provided from a file.

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Laurel-electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER Manual de usuario Pagina 70