ELECTRIC CHARGE METER Russian patent published in 2005 - IPC

FIELD: measurement technology.

SUBSTANCE: proposed meter (Fig. 10) has input operational amplifier 1, parallel RC circuits 3, and inverter 2 whose input is connected to output of operational amplifier 1; first RC circuit 3 is inserted between inverting input of operational amplifier 1 and input of inverter 2; second RC circuit 3 is inserted between noninverting input of operational amplifier 1 and output of inverter 2. Two groups of k circuits are connected in parallel with first and second RC circuits 3 at input circuit of operational amplifier 1 through isolating capacitors 6 and at output, through electric contact; each of these k circuits is set up of series-connected first electronic switch , capacitor, and second electronic switch; grounded resistor is connected to capacitor and the latter is connected to second electronic switch. Two groups of m circuits set up of series-connected first electronic switch, resistor, and second electronic switch are connected in the same way as k circuits, grounded resistor being connected to lead of resistor connected to second electronic switch.

EFFECT: enhanced stability in sensitivity adjustment.

2 cl, 12 dwg