Specifications

Section 11. Programming Resource Library

11-13

11.1.6.1 Quarter bridge Shunt (Option 13)

With EXAMPLE 11.1-5 sent to CR1000, and with strain gage stable, use the

CR1000KD keyboard or software numeric monitor to change the value in

variable KnownRes to the nominal resistance of the gage, 1000 Ω. Set

Shunt_Mode to 1 to start the two-point shunt calibration. When Shunt_Mode

increments to 3, the first step is complete.

To complete the calibration, shunt R1 with the 249 kΩ resistor. Set variable

KnownRes to 249,000. Set variable Shunt_mode to 4. When variable

Shunt_mode = 6, shunt calibration is complete.

FIGURE 11.1-2. Strain gage shunt calibration started.

FIGURE 11.1-3. Strain gage shunt calibration finished.

11.1.6.2 Quarter bridge Zero (Option 10)

Continuing from 9.8.6.1, keep the 249 kΩ resistor in place to simulate a strain.

Using the CR1000KD keyboard or software numeric monitor, change the value

in variable Zero_Mode to 1 to start the zero calibration as shown if FIGURE

1.1-4. When Zero_Mode increments to 6, zero calibration is complete as

shown in FIGURE 11.1-5.