DMM, control settings on the DMM, and DMM features. DMM DIGITAL MULTIMETER HOW TO USE - CONTENTS: how to choose, hook- up and use a digital multimeter or DMM safely and accurately. What is a DMM? Choosing a DMM; digital multimeter.
How to Use a Digital Multimeter or DMM: choosing a DMM, control settings on the DMM, and DMM features DMM DIGITAL MULTIMETER HOW TO USE - CONTENTS: how to choose. Back to Commercial Solid State Lasers Sub-Table of Contents. Hughes Rangefinder Ruby Laser Assembly Description and Specifications This pulsed ruby laser was used as. Learn more about Fluke Connect » Troubleshooting just got easier with the Ti95 Fluke Connect FCA Kit with Ti95 Thermal Imager, 3000 FC DMM, and a3001 FC iFlex® Module.
DMM accuray, typical specifications. Table Comparing Accuracy of Brands & Models of DMMs & VOMs. What is the Difference Between Precision and Accuracy in Measurements?
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How to Connect Test Probes, Set Function, & Set Range When Using a DMM or VOM? How to make voltage measurements using a Digital Multimeter (DMM) - settings. How to make resistance measurements (Ohms - Ω) using a Digital Multimeter (DMM) - settings. How to make current measurements (Amps) using a Digital Multimeter (DMM) - settings. Safety Features of Digital Multimeters (DMMs). Explanation of CAT ratings for electrical test tools.
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POST a QUESTION or READ FAQs about how to use a digital multimeter; settings, features, procedures. REFERENCESInspect. APedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. How to use a digital multimeter or DMM. This article explains what a DMM or digital multimeter is, how to choose one, and the accuracy of DMMs.
We describe the typical DMM probe connections & control settings to make voltage measurements, resistance measurements, and current measurements. We also discuss the types of DMM protective circuits and safety features. This article includes a table of typical DMM Functions, Ranges, & Accuracy Limits and a second table comparing the accuracy limits of DMM/VOM functions across most DMM/VOM manufacturer brands, using representative product models. Green links show where you are. Copyright 2. 01. 7 Inspect. Apedia. com, All Rights Reserved.
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How to Use a Digital Multimeter or DMM: choosing a DMM, control settings on the DMM, and DMM features The following article was adapted from information provided courtesy of Fluke Corporation - India, used with permission. Contact Us to offer technical critique, suggestions, additions. Safety Warning: Home inspection standards for electrical inspections do not require the inspector to insert any instrument into the service panel.
Therefore electrical tests that require using a VOM or DMM are optional during a property inspection even if they are in fact necessary for other more in- depth troubleshooting. Opening an electrical panel and approaching live electrical wiring, devices, & equipment is a dangerous procedure that can damage electrical equipment or worse, cause electrical shock, or even death. Such procedures should not be undertaken unless the person conducting the examination is trained and competent to avoid electric shock. If the inspector is not trained for this procedure. See SAFETY for ELECTRICAL INSPECTORS.
Our photo (above left) illustrates the Fluke 2. II DMM. Detailed safety advice specially applicable to using VOMs, DMMs and ammeters, including both personal safety and advice to avoid damaging the equipment is foundat VOLTS / AMPS MEASUREMENT EQUIPWhat is a Digital Multimeter or DMM? A DMM is simply an electronic device for making electrical measurements of electrical properties such as resistance, voltage level, or current flow. A DMM may have any. DMM measures AC or DC volts, ohms in one or more ranges, and amperes or electrical current. Note: while the DMM settings described in this article were written to describe using a Fluke DMM, most digital multimeters will have very similar controls and will use similar measurement procedures.
At left our photo illustrates the Sperry DSA- 5. A (Amps) of current flow on an electrical circuit. Accuracy of this measurement is as well as exactly how this measurement is made are discussed below. Advice for Choosing a DMMChoosing a DMM for the job requires not only looking at basic specifications, but also looking at.
Reliability, especially under tough conditions, is more important than ever today.[- Why? Ed.]Accuracy of Digital Multimeters (DMMs) and Analog VOMs. Definition of multimeter accuracy: DMM accuracy is defined as the largest allowable error that will occur under specific operating conditions. Accuracy for. a DMM is usually expressed as a percent of reading.
An accuracy of one percent of reading means that. At left our photo at left we illustrate measurement of Amps at 0.
A on the Sperry DSA- 5. A range, the proper ampacity testing range in order to report with finer precision when measuring lower current levels than if we had used the 4. A range setting. But what about accuracy differences in different DMM measuring ranges? Sperry's documentation for this DMM indicates that the accuracy of the instrument when measuring AC current (Amps) is +/- 2. C and 4. 5- 7. 5% relative humidity. The company is in essence warning that at more extreme temperatures or humidity levels the accuracy of the instrument may vary from this level.
Details of the procedure for measuring amps are provided below at How to make current measurements. Below we provide a table that describes the measuring ranges and accuracy of a DMM using this instrument as an example, followed by a table comparing DMM/VOM Specifications & settings for Actron DMMs, Equus / Innova DMMs, Extech Electronics DMMs, Fluke DMMs, Mastech DMMs, Simpson DMMs & VOMs, and Sperry DMMs. Example Table of DMM Functions, Ranges, & Accuracy Limits 1. AC Current Measurements (Amps) Specifications. Amps Range Setting Amps Measuring Range. Amps Measurement Accuracy. A0- 3. 9. 9. 9A+/- 2.
Hz)4. 00. A0- 3. 99. A AC Voltage (V) Auto- Ranging 2 Specifications. AC Volts Range Setting.
AC Volts Measuring Range. AC Voltage Measurement Accuracy. V0- 3. 99. 9. V+/- 2.
Hz)6. 00. V1. 50- 5. V DC Voltage (V) Auto- Ranging 2 Specifications. DC Volts Range Setting.
DC Volts Measuring Range. DC Voltage Measurement Accuracy. V0- 3. 99. 9. V+/- 2. V1. 50- 5. 99. V Resistance Measurement Specifications (Ω / Continuity.
Auto- Ranging 2. Ohms Function Setting. Ohms (Resistance) Measuring Range. Ohms Measurement Accuracy. Notes to the table. This data describes and is adapted from specifications for the Sperry DSA- 5.
Auto ranging indicates that the instrument adjusts the digits of the display to suit the level being measured. For example, when the instrument is set to measure AC voltage level (3- green arrow in our photo at left), the device will automatically adjust its sensitivity range to report either 0- 3. V or 1. 50- 5. 99. V, depending on the voltage level that the instrument senses. The instrument in ohms settings can be used as a simple electrical wire or circuit continuity tester.
In this mode a buzzer beeps when resistance is measured as below 5. Table Comparing Accuracy of Brands & Models of DMMs & Analog VOMs. DMM Measurement Accuracy Specifications by Brand, Model, Parameter. DMM Brand / Model 1. AC Voltage Accuracy. DC Voltage Accuracy. Ohms Accuracy. AC Amps Accuracy 2.
Actron DMMs [1. 2]CP7. Automotive to 2. 00. V ±(0. 8% rdg + 5 dgts)7. V ±(1. 0% rdg + 4 dgts)to 2. V ±(0. 5% rdg + 5 dgts)1.
V ±(0. 8% rdg + 5 dgts)to 2. MΩ ±(0. 8% rdg + 5 dgts)2. MΩ ±(1. 5% rdg + 5 dgts)n/a. Actron CP 7. 84. 9 Analog multimeter not stated in product literature not statednot statednot stated Equus / Innova DMMs [1. A Extech Electronics DMMs [1.
EX3. 30 DMM 0. 5% basic accuracy. AEXMP5. 30 DMM seriesto 1. V ±(0. 8%+3d) ACto 5. V ±(0. 0. 8%+2d) DC±(0. ACEX5. 42 True RMS DMM & Data Logger. Fluke DMMs [5]2. 8 II Ex±0.
Fluke / 1. 5B - 1. B ± (1. 0 % + 3 counts)± (0. Fluke / 2. 89 True- rms. Fluke / 1. 17 Electricians. Hz to 5. 00 Hz)2. Hz to 1 k. Hz)± ([% of reading] + [counts]): 0. Mastech DMMs [1. 0]VA1.
Mastech / VA2. 0 ±(1%+3)±(0. Mastech / MAS8. 30 series±1. Mastech / VA3. 12 clamp on ammeter±(1. V/6. 0V/6. 00. V ±(0.
V ±(1%+2)to 6. MΩ ±(1%+3)6. MΩ ±(5%+5)6. 00. A ±(2. A ±(3%+5)Mastech / M2. V ?? 2%1. 00. 0V ± 0. KΩ±1. 0%2. 00 - 6. A ±2. 0%, 6. 00 ~ 1.
A ±3. 0% Simpson DMMs [6]1. Simpson / 2. 60 6x. LM± 3% full scale± 2% full scale±2. R X 1 range; ±2. 0° of arcon all other ranges. Simpson / 2. 70- 5 2% of full scale @ 7.
F3% of full scale @6. F - 8. 7o. F1. 2. F1. 7. 5% of full scale @ 6. F - 8. 7o. F1. 5o of arc on Rx. Sperry DMMs [4]DM6.
V & 6. 00. V (1. V 2. 00. V (1. 0%+2dgt)n/a 2. K 2. 0K 2. 00. K 2. M (1. 2%+2dgt) Sperry / DM6.
V 4. 0V 4. 00. V (1. V 7. 50. V (1. 2%+5dgt)4. V(0. 8%+3dgt) 4. V 4. V 4. 00. V(0. 8%+1dgt) 1.
V (1. 0%+3dgt)4. 00µA 4. A (1. 2%+2dgt)4. 0m. A 4. 00m. A (1. 5%+3dgt)4. A 1. 0A (2. 0%+3dgt)4. M (1. 2%+2dgt)4. K 4. K 4. 00. K (1. 0%+2dgt)4. M (1. 5%+2dgt)Sperry / 6.