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

Circuit theory, derivation for two watt meter method

derivation for two watt meter method

How many machine cycles does 8085 have, How many machine cycles does 8085 h...

How many machine cycles does 8085 have, mention them The 8085 have seven machine cycles. They are Opcode fetch Memory read Memory write I/O read I/O

What does the eu do, Execution Unit receives program instruction codes and ...

Execution Unit receives program instruction codes and data from BIU, implements these instructions and store the result in general registers.

Mvi move immediate instruction , MVI Move Immediate  Instruction This...

MVI Move Immediate  Instruction This form  of the instruction is used to copy 8bit  data ( specified  in the  instruction )  directly  into the  register or memory  pointed by

What is permeability of magnetic materials, Q. What is permeability of magn...

Q. What is permeability of magnetic material? For magnetic material media, the magnetic flux density B, expressed in tesla (T) or Wb/m 2 , and the field intensity H, expressed

Dc Machine, Why maximum power output is given by a machine at an efficiency...

Why maximum power output is given by a machine at an efficiency of 50 percent?

File flops - introduction to microprocessors, File Flops The flip fl...

File Flops The flip flop is a one storage biteable   device. The basic  bistable device stores a binary  of inputs  value. the flip flops  are categorized according  to the nu

What is microprocessor, What is Microprocessor? Give the power supply & clo...

What is Microprocessor? Give the power supply & clock frequency of 8085. A microprocessor is a multipurpose, programmable logic device that reads binary instructions from a sto

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