Fluke 80 Series III user manual Testing Diodes, Testing a Diode

Page 29

Making Measurements

Testing Diodes

Caution

To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before testing diodes.

Use the diode test to check diodes, transistors, silicon controlled rectifiers (SCRs), and other semiconductor devices. This function tests a semiconductor junction by sending a current through the junction, then measuring the junction’s voltage drop. A good silicon junction drops between 0.5 V and 0.8 V.

To test a diode out of a circuit, set up the meter as shown in Figure 6. For forward-bias readings on any semiconductor component, place the red test lead on the component’s positive terminal and place the black lead on the component’s negative terminal.

In a circuit, a good diode should still produce a forward- bias reading of 0.5 V to 0.8 V; however, the reverse-bias reading can vary depending on the resistance of other pathways between the probe tips.

Forward Bias

87 III TRUE RMS MULTIMETER

Typical

+

 

Reading

 

 

MIN MAX

RANGE

HOLD

 

REL

Hz

4 1/2 DIGITS PEAK MIN MAX

 

 

1 Seconds

 

 

mV

 

 

V

 

mA

 

A

VμA

OFF

A

mA μA

COM

V

 

 

 

 

!

 

400mA MAX

 

CAT II

 

10A MAX

FUSED

1000V MAX

 

FUSED

!

 

 

Reverse Bias

87 III TRUE RMS MULTIMETER

+

MIN MAX

RANGE

HOLD

 

REL

Hz

4 1/2 DIGITS PEAK MIN MAX

 

 

1 Seconds

 

 

mV

 

 

V

 

mA

 

A

VμA

OFF

A

mA μA

COM

V

 

 

 

 

!

 

400mA MAX

 

CAT II

 

10A MAX

FUSED

1000V MAX

 

FUSED

!

 

 

iy9f.eps

Figure 6. Testing a Diode

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Contents Series Lifetime Limited Warranty Table of Contents Series List of Tables Series List of Figures Series Introduction Series International Electrical SymbolsSafety Information Inputs Description Your Meter’s FeaturesTerminal Rotary Switch Positions Function Switch PositionPushbuttons Button Function Button FunctionButton Display Features Model 87 Shown 100 ms Number FeatureDisplay Features Indication ΜA, mA ΜF, nF Me, ke Hz, kHz, MHz Display Features NumberAutomatic Power-Off Power-Up OptionsMeasuring AC and DC Voltage Input Alert FeatureMaking Measurements Switch Box Testing for Continuity For in-circuit tests, turn circuit power off Measuring Resistance Isolating a Resistor DisconnectMeasuring Capacitance Using Conductance for High Resistance or Leakage TestsMeasuring Capacitance Series Testing a Diode Testing DiodesMeasuring AC or DC Current WWarningCurrent through one component Series Measuring Frequency All ranges Components of Duty Cycle Measurements Measuring Duty CycleModel 87 Bar Graph Analog Bar GraphDetermining Pulse Width Models 83 and 85 Bar Graph 2 Digit Mode ModelMIN MAX Recording Mode MIN MAX Functions Zoom Mode Models 83 Touch Hold ModeRelative Mode General Maintenance MaintenanceUses for the Zoom Mode Models 83 00.5 Ω Replace fuse OL Testing the FusesTouch top half Input contactsReplacing the Fuses Replacing the BatteryService and Parts Battery and Fuse Replacement Quantity Replacement PartsFluke Part Or Model Number Replaceable Parts Fluke Part Number AccessoriesSpecifications KHz 20 kHz2 Models 85 and 87 AC Voltage Function SpecificationsModel 83 AC Voltage Function Specifications Model Resolution Model Model 853 Burden Voltage Typical Current Function SpecificationsΜA B Frequency Counter Specifications Capacitance and Diode Function SpecificationsAccuracy Frequency Counter Sensitivity and Trigger LevelsElectrical Characteristics of the Terminals MIN MAX Recording Specifications

80 Series III specifications

The Fluke 80 Series III digital multimeters are renowned for their robust engineering, precision, and versatility, making them a staple in the toolkit of electricians, engineers, and technicians. Launched by Fluke Corporation, a leading manufacturer of electronic test tools, the 80 Series III has set a benchmark in the multimeter industry for its reliability and performance.

One of the standout features of the Fluke 80 Series III is its wide measurement capabilities. The device can accurately measure AC and DC voltage, DC current, resistance, frequency, and capacitance. This comprehensive feature set allows users to tackle a variety of tasks, from simple household electrical checks to complex industrial applications. The meter's high input impedance prevents loading effects on circuits, ensuring accurate readings, especially in sensitive electronic applications.

Fluke's proprietary True-RMS technology is another defining characteristic of the 80 Series III. This technology ensures that the multimeter provides accurate readings for both non-linear loads and distorted waveforms, which are common in many modern electrical systems. This capability is particularly valuable in diagnosing issues in variable frequency drives, inverters, and other electronic systems that do not present traditional sinusoidal waveforms.

Durability is a key factor in the design of the Fluke 80 Series III. The multimeter is housed in a rugged, impact-resistant case that can withstand the rigors of fieldwork. It features a built-in protective holster with a probe holder, enhancing portability while safeguarding the device against drops and bumps. Furthermore, the 80 Series III boasts an IP67 rating for dust and water resistance, ensuring reliable performance in adverse conditions.

User-friendliness is also a significant aspect of the Fluke 80 Series III. The large, easy-to-read display, combined with intuitive controls, allows users to navigate its functions with ease. The multimeter features a backlight, enabling use in dimly lit environments, while the hold function ensures that readings can be captured and displayed even after disconnecting the probes.

In addition to these features, the Fluke 80 Series III offers various models to cater to specific needs, such as the 87V for highly accurate measurements in industrial environments and the 86V for temperature measurements with added thermocouple support. Each model maintains the high standards of quality and performance that Fluke is known for.

In summary, the Fluke 80 Series III digital multimeters combine advanced features, high accuracy, and rugged durability, making them indispensable tools for professionals who require reliable performance in challenging environments. Whether for routine maintenance or complex troubleshooting, the 80 Series III offers everything necessary to meet the demands of today’s electrical tasks.
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