VXi VT1529A/B 사용자 설명서

This test verifies the operation of the internal 50 k

Ω shunt resistor and the 

associated switches in the VT1529A/B.

Switch operation can be verified by observing the changes in the bridge 
output voltage when internal shunt calibration is disabled and enabled.

The bending half-bridge strain path is configured and the Dummy Load is 
attached. With the internal shunt disabled, the bridge output voltage should be:

V

sense

 = V

excitation

 * (10 / (10 + 7.5) - 0.5)

With V

excitation

 = 2.0 V, the expected value of V

sense

 is 0.142857 V.

With the internal shunt enabled, the bridge output voltage should be:

V

sense

 = V

excitation

 * (10 / (10 + R) - 0.5)

Where R equals the parallel combination of the 7.5 k

Ω resistor in the 

Dummy Load and the 50 k

Ω internal shunt or 6.522 kΩ. Again, with 

V

excitation

 = 2.0 V, the expected value of V

sense

 is 0.210526 V.

10K

Buffer

To VT1422A

(VT1539A SCP)

X2

Buffer

RJ-45

X2

2:1

Mux

Cal-

Cal+

8-pin Telcom

Connector (RJ-45)

Cal-

Cal+

350

120

customer

10K

10K

10K