Sensoray 518 Manual do Utilizador descarregar pdf (Página 37)

Calibrate 518

This command calibrates coprocessor internal standards. All measurements made by the

coprocessor are referenced to these standards. To perform a board calibration, you must supply

two reference voltages (5 volts and 500 millivolts) and a reference resistance (380 ohms).

References must be calibrated in the following order: 5 volts, 500 mV, 380 ohms.

select codes for the Calibrate command

COMMAND: (224 + CHAN), (CAL_CODE),(CAL_DATA_MSB), (CAL_DATA_LSB)

RESPONSE: (DON’T_CARE)

Example: This code fragment will assist you in calibrating the 518.

FOR calCode% = 0 TO 2

SELECT CASE calCode%

CASE 0:refName$ = “5 volt”:scalar% = 5000: sensorCode% = 0

CASE 1: refName$ = “500 mV”: scalar% = 50: sensorCode% = 13

CASE 2: refName$ = “380 ohm”:scalar% = 40: sensorCode% = 9

END SELECT

INPUT “What channel is “; refName$; “ reference connected to”; chan%

CALL Send518Byte (16 + chan%) ‘declare channel sensor type

CALL Send518Byte (sensorCode%)

INPUT “What is exact value of “; refName$; “ reference”; actualValue!

CALL Send518Byte (224 + chan%) ‘issue Calibrate command

CALL Send518Byte (calCode%) ‘issue Calibrate command

CALL Send518Byte (actualValue% * scalar%) ‘issue Calibrate command

junk% = Read518Byte% ‘wait for 518 to calibrate

OUT BasePort% + 1, 0 ‘reset 518 board

NEXT calCode%

CAL_CODE FUNCTION

0 5 volt range

1 500 millivolt range

400 ohm range

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 56 57

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Sensoray 518 Manual do Utilizador Página 37