Advantages of Balanced Bridge Transistor Voltmeters

Advantages of Balanced Bridge Transistor Voltmeters Points : advantages of balanced bridge transistor voltmeters A TVM bridge circuit with a substantial negative feedback minimizes drift due to variations in beta (β), lc and power supply fluctuations.

If the ambient temperature increases, the beta (β)value of both Q₁ and Q₂ increase. Assuming that the two transistors Q₁ and Q₂ are perfectly matched, the increase in cut tent through R_C1is the same as through R_C2, and bridge thus remains balanced.

Power supply fluctuations results in variations and Vcc values, and since bias change is the same for both transistor and here the bridge remains balanced.

The maintenance of calibration accuracy, however, requires the action of a substantial amount of negative fee back, in addition to a stable balance conditions.