Sensoray 7429 Manual do Utilizador descarregar pdf (Página 30)

Calibrate Board

This command is used to calibrate all 7429 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 one reference

resistance (380 ohms).

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

COMMAND: (224 + CHAN),(CAL CODE),(DATA HIGH),(DATA LOW)

RESPONSE: (GARBAGE)

Cal Code Reference

0 5 volts

1 500 mV

2 380 ohms

Example: This code segment will assist you in calibrating the 7429.

FOR calCode% = 0 to 2

SELECT CASE calCode%'setup cal parameters

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 SendByte (16 + chan%)'declare channel sensor type

CALL SendByte (sensorCode%)

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

CALL SendByte (224 + chan%)'issue calibrate command

CALL SendByte (calCode%)

CALL SendWord (actualValue! * scalar%)

junk% = ReadByte%'wait for 7429 to calibrate

OUT BasePort% + 1, 0'reset 7429 board

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Sensoray 7429 Manual do Utilizador Página 30