Parts a & b pls. 1. Normal benchtop digital multimeters (DMMs), such as pictured below, can only measureresistances below a couple of megaohms. Measurements for large resistances such as insu-lation or PCB materials requires special equipment.R1>1GQNormal Benchtop DMMTestCurrent• 200ΜΩ100nAInputResistanceVVoltmeterADCMT 7451A DIGITAL MULTIMETER319.999.A(a) An ohmmeter (which is one of the ways in which a DMM can behave) divides a mea-sured voltage by a test current to compute resistance. In the circuit above, the testcurrent is 100 nA and the measured voltage is the green "V" labeled Voltmeter. Forthe scenario depicted above with a 1 GN resistor attached to the DMM, show that thecomputed resistance is very different from the actual resistance of R1.(b) Explain why the DMM cannot accurately measure a very large resistance like a gi-gaohm, but a small resistance like a kiloohm is not a problem.

Answered: 1. Normal benchtop digital multimeters…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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Parts a & b pls.

1. Normal benchtop digital multimeters (DMMs), such as pictured below, can only measure
resistances below a couple of megaohms. Measurements for large resistances such as insu-
lation or PCB materials requires special equipment.
R1
>1GQ
Normal Benchtop DMM
TestCurrent
• 200ΜΩ
100nA
InputResistance
V
Voltmeter
ADCMT 7451A DIGITAL MULTIMETER
319.999.
A
(a) An ohmmeter (which is one of the ways in which a DMM can behave) divides a mea-
sured voltage by a test current to compute resistance. In the circuit above, the test
current is 100 nA and the measured voltage is the green "V" labeled Voltmeter. For
the scenario depicted above with a 1 GN resistor attached to the DMM, show that the
computed resistance is very different from the actual resistance of R1.
(b) Explain why the DMM cannot accurately measure a very large resistance like a gi-
gaohm, but a small resistance like a kiloohm is not a problem.

Expert Solution

Step 1

Electrical resistance is measured with an ohmmeter, a device that uses that unit of measurement. The resistance to be measured can be connected to the instrument in parallel or in series using the simplest ohmmeters. The device will draw more current as resistance rises if in parallel (parallel ohmmeter).
Real resistors usually differ from their marked theoretical schematic values due to tolerances.

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