Laureate™ Calibration Software

For Thermocouple / RTD panel meters, plus DC, strain & load cell meters used in a ratiometric / bridge mode.
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Calibration software screen for Laurel digital panel meters
First calibration software screen for Laureate digital panel meters.

As shipped by Laurel Electronics, all ranges of Laureate digital panel meters are fully calibrated, with calibration factors stored in EEPROM. This allows different ranges to be selected via plug-in jumpers, with no need to recalibrate the meter for each new range. The 0-200 mV scale serves as the reference scale. All other scales apply multipliers to this scale.

This calibration page applies to the following Laureate meters:

Calibration of these meters requires a temporary serial data connection to a PC and use of special Laureate Calibration software, which is downloadable at no charge by clicking on the links below. Calibration entails the application of a known reference signal to each scale and the automatic calculation of a multiplier so that the reading corresponds to that signal. In case of a DC meter, the 200.00 mV scale is calibrated first because it serves as a multiplier for the other scales. When a 200.00 mV signal is applied, the meter will actually read 80000 during calibration. The reading is multiplied by a factor of 4 to assure a more accurate calibration.

Computer-assisted calibration can be manual or automatic. In manual calibration, the computer screen prompts the operator step by step on which jumpers to set and reference signals to apply, and then to press the Enter key on the computer keyboard. In automatic calibration, the computer controls both the Laureate and the calibrator; however, a person still has to position jumpers to select the various ranges.

Required Hardware & Software

1. A Laureate DPM with an RS-232 or RS-485 serial communications board. If required, such a board can be installed temporarily in the meter for the calibration, then be removed.
2. A PC-compatible computer operating either under MS DOS or Windows, with an available COM2 port.
3. A serial cable joining the DPM to the computer, as documented in the Laureate Serial Communications Manual.
4. A certified external calibrator for reference voltage, current or time base. In addition, an ice point cell is required for thermocouple calibration. Automatic calibration of meters with an analog input requires a Fluke Model 5100 calibrator or equivalent with an IEEE-488 connection to the computer.
5. Laureate calibration software, which can be downloaded at no charge by clicking on the links below:
caltc4q.exe For temperature meter (119 kB)
callc4q.exe For a load cell panel meter (124 kB)
loadcell.fil Auxiliary data file for load cell meter (17 bytes).
caldc4q.exe For all ranges of a DC meter (136 kB).
dcratio.fil Auxiliary data file for DC meter used in ratiometric mode for pot follower or strain gauge applications (17 bytes).

Absolute Range Calibration for Temperature, DC or Load

Connect the Laureate to the calibrator and computer, double-click on the appropriate executable file (caldc4q.exe or caltc4q.exe), and follow the prompts on the computer screen. Following calibration, all calibration factors will be stored in EEPROM.

Ratiometric Calibration for Load Cell or DC Ratio

1. Calibrate the absolute 200 mV range for the DC signal conditioner or the absolute 250 mV range for the load cell signal conditioner.
2. Place the auxiliary file LOADCEL.FIL is in the same directory as CALLC4Q.EXE (load cell meter), or the auxiliary file DCRATIO.FIL in the same directory as CALDC4Q.EXE (DC meter used in strain or ratiometric mode).
3. Connect the Laureate to the calibrator and computer, double-click on the appropriate executable file (CALLDC4Q.EXE OR CALLC4Q.EXE), and follow the prompts. Your first step will be to perform a calibration of any DC ranges that will be used for ratiometric operation.
4. Connect the calibrator via a voltage divider circuit as illustrated below, using two 5 k© resistors and one 175 © resistor (1% accuracy).

Calibration circuit for Laureate digital panel meters
5. Set the DC signal conditioner to the 200 mVdc range or the load cell signal conditioner to the 250 mV DC range. Set scale to 1 and zero offset to 0. Set the calibrator output to 10.000 V. Read the voltage displayed on the meter for the signal applied across pins 3 and 4.
6. Make the M2 selection on the computer screen, and follow the prompts for ratiometric calibration. As part of this process, you will need to enter the voltage measured in step 5.
7. Following ratiometric calibration, all correction factors will be stored in EEPROM for 0.01% accuracy.
For additional calibration software, please see our software download page.
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