2586 - PAC Designer: In the PAC-Designer TRIM block, why does the Vbpz value sometimes change when the EIA Resistor Standard is changed in the options menu?
Solution:
The EIA resistor standard option sets the available resistor choices to the TRIM calculator. For example, EIA96 gives more resistor choices to the calculator then EIA24. The calculator compares the possible Vbpz values with different resistor networks (based on available choices). The goal of the calculator is to reach the closest possible "Realized Voltage" to the Target Voltage. Sometimes the calculator will select a different Vbpz value to meet this goal. When the Vbpz is updated, the resistor network values will also be updated.