Part A: A multi-range ammeter is required to measure the current in a certain network. A PMMC instrument has connected as an Ayrton shunt with a four resistor across PMMC. The resistance values are R1 = 0.0060, R2 = 0.0650, R3 = 4.00 and R4 %3D %3D %3D =10.00. The PMMC has Rm = 1kQ and FSD = 50µA. %3D a. Draw the circuit for the multi-range Ayrton shunt. b. Calculate the four current ranges of the ammeter. c. What is the main advantage of Ayrton shunt ammeter compared to parallel type. d. Briefly explain how this device can be calibrated.

EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN:9781337516549
Author:Simmons
Publisher:Simmons
Chapter19: Special-purpose Outlets-water Pump, Water Heater
Section19.2: Water Heater Branch Circuit
Problem 8R: For residential water heaters, the Consumer Product Safety Commission suggests a maximum temperature...
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Part A:
A multi-range ammeter is required to measure the current in a certain network. A
PMMC instrument has connected as an Ayrton shunt with a four resistor across
PMMC. The resistance values are R1 = 0.006N, R2 = 0.0650, R3 = 4.00 and R4
=10.00. The PMMC has Rm = 1kQ and FSD = 50µA.
%3D
%3D
a. Draw the circuit for the multi-range Ayrton shunt.
b. Calculate the four current ranges of the ammeter.
c. What is the main advantage of Ayrton shunt ammeter compared to parallel
type.
d. Briefly explain how this device can be calibrated.
* Note: Show all calculation details.
Part B:
The measurement of the voltage from a prototype of a 20V DC power supply were
captured by 8 times as shown in the following table:
Number
1 2 3
4
6
Voltage (V)
18.5
19.8
20.2
19.9
20.0
20.1
19.7
18.9
Determine the following:
1. the arithmetic mean,
2. the standard deviation of the readings,
3. the probable error.
4. If the voltmeter that used to carry the measurements has an error of 0.5%;
calculate the total error in the measured voltages.
**Note: Show the full details of your answer.
Transcribed Image Text:Part A: A multi-range ammeter is required to measure the current in a certain network. A PMMC instrument has connected as an Ayrton shunt with a four resistor across PMMC. The resistance values are R1 = 0.006N, R2 = 0.0650, R3 = 4.00 and R4 =10.00. The PMMC has Rm = 1kQ and FSD = 50µA. %3D %3D a. Draw the circuit for the multi-range Ayrton shunt. b. Calculate the four current ranges of the ammeter. c. What is the main advantage of Ayrton shunt ammeter compared to parallel type. d. Briefly explain how this device can be calibrated. * Note: Show all calculation details. Part B: The measurement of the voltage from a prototype of a 20V DC power supply were captured by 8 times as shown in the following table: Number 1 2 3 4 6 Voltage (V) 18.5 19.8 20.2 19.9 20.0 20.1 19.7 18.9 Determine the following: 1. the arithmetic mean, 2. the standard deviation of the readings, 3. the probable error. 4. If the voltmeter that used to carry the measurements has an error of 0.5%; calculate the total error in the measured voltages. **Note: Show the full details of your answer.
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