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Volt meter proteus library generator#

So output of this comparator produces a negative going pulse which makes the gating circuit to so when the VR crosses zero and moves to negative values, the input at inverting terminal is greater than non-inverting terminal. Ground comparator or zero level detector. These pulses are counted by decade counter

Volt meter proteus library generator#

This pulse makes the gating circuit to start and the pulse produced by the clock generator passes through the gating circuit. When Vr decreases below Vm it produces a positive going pulse, When the input at inverting terminal of op-amp is less than Vm out at the input comparator is positive otherwise it is negative. This momentarily removes the digital display of the readout.Īn unknown voltage Vm is given to the input of non-inverting terminal.

At the same time it sends a pulse to the counters which set all of them to 0.

The sample rate circuit provides an initiating pulse for the ramp generator to start its next ramp voltage.

The sample rate multivibrator determines the rate at which the measurement cycles are initiated.

The decimal number as indicated by the readout is a measure of the value of input voltage.

During this time interval pulses from a clock pulse generator pass through the gate and are counted and displayed.

The time elapsed between opening and closing of the gate is t as indicated in Fig.

At this instant another comparator called ground comparator generates.

The ramp voltage continues to decrease till it reaches ground level (zero voltage).

At the instant the value of ramp voltage is equal to that of unknown voltage.The ramp voltage value is continuously compared with the voltage being measured (unknown voltage).but a positive going ramp may also be used. A negative going ramp is shown in Fig.At the start of measurement a ramp voltage is initiated.operation of RAMP Digital Voltmeter Working Process of RAMP Type DVM: The conversion of a voltage value of a time interval is shown in the timing diagram given below.This time interval is measured with an electronic time interval counter and the count is displayed as a number of digits on electronic indicating tubes of the output readout of the voltmeter.The operating principle of a ramp type digital voltmeter is to measure the time that a linear ramp voltage takes to change from level of input voltage to zero voltage (or vice versa).