Voltmeter Schaltung. The main principle of voltmeter is that it must be connected in parallel in which we want to measure the voltage. The chip senses the measuring input voltage as a parameter and compares it with reference every time the voltage crosses the certain part of reference the corresponding led glows.
We know the unit of potential difference is volts. So it is a measuring instrument which measures the potential difference between the two points. In this case the meter movement s full scale current rating of 1 ma gives it a voltmeter sensitivity of 1000 ω v regardless of how we range it with multiplier resistors.
For example if your voltmeter is set to dc 10v look for a dc scale with a max reading of 10.
At the heart of most analog meters is a galvanometer an instrument that measures current flow using the movement or deflection of a needle. Lm3914 is a 10 stage voltmeter that means it shows variations in 10 bit mode. A voltmeter is connected in parallel with a device to measure its voltage while an ammeter is connected in series with a device to measure its current. In this case the meter movement s full scale current rating of 1 ma gives it a voltmeter sensitivity of 1000 ω v regardless of how we range it with multiplier resistors.
