Sensoray 7429 Manuel d'utilisateur télécharger pdf (Page 20)

Example: A 350¾ pressure gage is to be connected to channel 7. The gage spec-

ification is 3 mV/V at 150 PSI. 3 (mV/V) x 10 = 30.

The application requires a resolution of one-tenth PSI. At full load, therefore, the

7429 should output a value of 150 PSI / 0.10 PSI = 1500. Since this is a 350¾ gage

(the gage input impedance is 350¾), R = 350.

A suitable QuickBasic sequence would be:

CALL SendByte (16 + 7)'opcode + channel

CALL SendByte (&H12)'sensor definition code

CALL SendWord (30)'V

CALL SendWord (1500)'P

CALL SendWord (350)'R

Data will now be returned from the 7429 (when requested via the read channel data

command) in units of 0.10 PSI/bit.

Note that pressure gage/load cell input impedance is not limited to 350¾. Any im-

pedance greater than 120¾ is acceptable.

Example:

Configure channel 2 for interface to type K thermocouple. The QuickBasic se-

quence is:

CALL SendByte (16 + 2)'opcode + channel

CALL SendByte (3)'sensor definition code

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Sensoray 7429 Manuel d'utilisateur Page 20