Explain ramp type dvm, Electrical Engineering

Assignment Help:

SOL. Ramp Type VM: The operating principle of the ramp type DVM is based on the measurement of the time it takes for a linear ramp voltage to rise from 0 V to the level of the input voltage or to decrease from the level of the voltage to zero. 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.

Conversion from a voltage to a time interval is illustrated by the waveform diagram.

      At the start of the measurement cycle, a ramp voltage is initiated, this voltage can be3 positive going or negative going. The negative going ramp is continuously compared with the unknown input voltage. At instant that the ramp voltage equals the unknown voltage, a coincidence circuit a comparator, generates a pulse which open a gate. This gate is shown in the block diagram of.

The voltage continues to decrease with time until it finally reaches 0 V (or ground potential) and a second comparator generates an output pulse which closes the gate.

An oscillator generates clock pulses which are allowed to pass through the gate to a number of decade counting units (DCU's) which totalize the number of pulses passed through the gate. The decimal number, displayed by the indicator tubes associated with the DCU's is a measure of the magnitude of the input voltage. The sample rate multivibrator determines the rate at of which the measurement cycles are initiated. The oscillation of this multivibrator can usually be adjusted by a front panel control, marked rate, from a few cycles per second to as high as 1000or more. The sample rate circuit procides an intiating pulose for the ramp generator to start its next ramp voltage. At the same time a reset pulse is generated which returns all the D.C. Voltages to their 0 state. Removing the display momentarily from the indicator tubes.

 

 


Related Discussions:- Explain ramp type dvm

What are hard magnetic materials, What are hard magnetic materials? Har...

What are hard magnetic materials? Hard Magnetic materials- They have a slowly rising magnetization curve along with large hysteresis loop area and therefore large energy losses

Technical loss reduction - power supply, Technical Loss Reduction - Power S...

Technical Loss Reduction - Power Supply 1. Technical loss reduction could be achieved through several measures such as network reconfiguration, load balancing, network recondu

Explain the working of direct memory access controller, Explain the various...

Explain the various modes in which DMAC works. Working of Direct memory access controller: The modes of operation has demand mode, block mode, single mode and cascade mode.

Determine dielectric materials are which type of materials, Dielectric mate...

Dielectric materials are (A) Insulating materials.        (B) Semiconducting materials. (C) Magnetic materials.         (D) Ferroelectric materials. Ans:

What is elementary diode circuits, Q. What is Elementary Diode Circuits? ...

Q. What is Elementary Diode Circuits? Semiconductor diodes are used in a wide variety of applications. Their usage abounds in communication systems (limiters, gates, clippers,

Mould casting, Mould Casting: Plaster Moulding : In this method, the...

Mould Casting: Plaster Moulding : In this method, the mould is prepared in gypsum or plaster of paris. In practice, the plaster of paris is mixed with tale, asbestos, fibers

Requirement specification for the monitor and alarm system, Prepare a User ...

Prepare a User Requirement Specification for the monitor and alarm system. User Requirements Specification should be written in a clear and unambiguous manner to state: • The

Identify the processes involved in fabrication, The first three elements of...

The first three elements of the task are: 1. To critically examine a selection of the components used on this design 2. To recommend materials to be used in making the board

Shunt capacitors, Shunt Capacitors Line losses owing to poor PF can be...

Shunt Capacitors Line losses owing to poor PF can be decreased through improving the PF. Overall improvement in the operating condition can be brought about through reducing t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd