Example 3-8 A PMMC instrument with FSD= 100 HA and R. -1 kn is to be employed as an ac va meter with FSD = 100 V (ms). Silicon diodes are used in the bridge rectifier circuit Figure 3-17. Calculate the multiplier resistance value required. Solution At FSD, the average current flowing through the PMMC instrument is I- 100 HA peak current la" 0.637 100 A 0.637 157 A L- Capplied peak voltage) - (rectifier volt drop) total circuit resistance rectifier volt drops - 2V, (for D, and D, or D, and D) applied peak voltage - 1.414Vm total eircuit resistance - R, + R. 1414V,m- 2V, R, + R. 1.414Vm -2V, (1414 x 100 V)-(2 x0.7 V) 157 A - I ko 890.7 kn
Example 3-8 A PMMC instrument with FSD= 100 HA and R. -1 kn is to be employed as an ac va meter with FSD = 100 V (ms). Silicon diodes are used in the bridge rectifier circuit Figure 3-17. Calculate the multiplier resistance value required. Solution At FSD, the average current flowing through the PMMC instrument is I- 100 HA peak current la" 0.637 100 A 0.637 157 A L- Capplied peak voltage) - (rectifier volt drop) total circuit resistance rectifier volt drops - 2V, (for D, and D, or D, and D) applied peak voltage - 1.414Vm total eircuit resistance - R, + R. 1414V,m- 2V, R, + R. 1.414Vm -2V, (1414 x 100 V)-(2 x0.7 V) 157 A - I ko 890.7 kn
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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Can you explain how it came to the final answer, first picture (a) and second picture (b)?
And what is the used of voltmeter sensitivity in solving the value of the multiplier resistor in series with the meter resistor?
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