What is the procedure of calibration of Ammeter?
How to Calibrate an Ammeter
- Connect the two terminals of the voltage source to either side of the 1 kOhm resistor. Video of the Day.
- Connect the two terminals of the ammeter across the resistor, or in parallel.
- Switch on the voltage supply, and set it to 1 V.
- Calculate the expected value of current using Ohm’s law.
What do you mean by calibration of Ammeter?
The calibration is the process of checking the accuracy of the result by comparing it with the standard value. In other words, calibration checks the correctness of the instrument by comparing it with the reference standard.
How an AC potentiometer is used for the calibration of voltmeter?
A voltage-ratio box is used to reduce the voltage across the voltmeter and applied to the potentiometer. The potentiometer reads the true value of the voltage. If this value is matched with the voltmeter readings, then the error is zero.
How are calibration graphs drawn?
To construct the calibration curve, use a computer program to plot the data as signal vs. concentration. Use the standard deviation of the repeated measurements for each data point to make error bars. Remove portions of the curve that are non-linear, then perform a linear regression and determine the best-fit line.
What other instrument can be used to calibrate an ammeter?
potentiometers
Other than measuring voltage, current, and power, the potentiometers are mainly used for calibration of voltmeters, ammeters, and wattmeter. Also, since the potentiometer is a DC device, the instruments to be calibrated must be DC moving iron or electrodynamometer types.
How do you calibrate a potentiometer?
A common way to calibrate a potentiometer is to move the sensor between two positions and to read the change in mechanical movement and the corresponding change in output voltage at a given supply voltage, typically 5VDC or 10VDC.
How do you do a calibration plot?
The equation will be of the general form y = mx + b, where m is the slope and b is the y-intercept, such as y = 1.05x + 0.2. Use the equation of the calibration curve to adjust measurements taken on samples with unknown values. Substitute the measured value as x into the equation and solve for y (the “true” value).
How do you graph a calibration?