Fluke Corporation stands as a global leader, renowned for its professional electronic test tools and software, delivering precision and reliability to professionals worldwide.
This robust digital multimeter undergoes rigorous testing, ensuring accuracy and durability even in challenging environments, making it a trusted tool for various applications.
Overview of the Fluke 87 III
The Fluke 87 III is a highly regarded digital multimeter designed for electrical professionals needing a reliable and accurate tool for troubleshooting and maintenance. It builds upon the legacy of the Fluke 87 series, known for its ruggedness and performance in demanding industrial settings.
This multimeter excels in a wide range of applications, from industrial electrical installations and maintenance to precision measurement and quality control. Fluke tools are specifically engineered for portability, safety, and ease of use, ensuring professionals can efficiently diagnose and resolve electrical issues.
The 87 III is a versatile instrument capable of measuring voltage, current, resistance, frequency, and performing continuity and diode tests. Its robust design and rigorous testing guarantee accuracy and dependability, even when exposed to harsh conditions. It’s a cornerstone for anyone requiring a dependable electrical testing solution.
Key Features and Benefits
The Fluke 87 III boasts several key features enhancing its usability and performance. It offers accurate AC/DC voltage and current measurements, alongside precise resistance readings, crucial for comprehensive electrical analysis. Continuity testing provides quick verification of circuit connections, while the diode test function aids in semiconductor diagnostics.
Beyond basic measurements, the 87 III includes frequency measurement capabilities, expanding its utility for analyzing AC signals. Its rugged construction ensures durability in harsh environments, and its intuitive interface promotes ease of use, even for complex tasks.
Professionals benefit from increased efficiency, improved safety, and reliable results. The multimeter’s design prioritizes portability, allowing for convenient on-site troubleshooting. Ultimately, the Fluke 87 III delivers a powerful and dependable solution for a wide spectrum of electrical testing needs.
Getting Started with Your Fluke 87 III
Familiarization with controls is essential before operation; the 87 III is designed for industrial, maintenance, and precision measurement applications, offering versatile functionality.
Unboxing and Initial Inspection
Upon receiving your Fluke 87 III Multimeter, carefully inspect the packaging for any signs of damage incurred during shipping. Gently open the box and verify that all included components are present. These typically include the multimeter unit itself, test leads (usually red, black, and alligator clips), a user manual, and potentially a battery installation guide or quick reference card.
Thoroughly examine the multimeter for any visible defects, such as cracks in the casing, damaged display, or loose buttons. Ensure the test leads are intact, with no frayed wires or broken connectors. If any damage or missing components are detected, immediately contact Fluke Corporation or your point of purchase for assistance. Retain all packaging materials for potential return or warranty claims. A careful initial inspection ensures you begin with a fully functional and complete instrument.
Battery Installation and Replacement
The Fluke 87 III typically operates on four AA alkaline batteries. To install or replace them, begin by disconnecting any test leads connected to the multimeter. Locate the battery compartment, usually on the rear of the unit, and open it. Observe the correct polarity markings (+ and -) inside the compartment. Insert the new batteries, ensuring they are properly aligned with these markings.
Close the battery compartment securely. The display should illuminate, indicating successful battery installation. When the low battery indicator appears on the display, replace all batteries simultaneously with fresh ones. Do not mix old and new batteries, or different types of batteries. Dispose of used batteries responsibly, following local regulations. Proper battery maintenance ensures reliable performance of your Fluke 87 III.
Understanding the Display
The Fluke 87 III features a large, easy-to-read digital display. The primary display area shows the measured value, while secondary displays provide additional information. Key indicators include the function selection (V, A, Ω, etc.), the input terminals used, and the measurement range. A low battery indicator alerts you when battery replacement is needed.
Additionally, the display incorporates a continuity indicator, which emits an audible beep and displays a symbol when a closed circuit is detected. A diode test indicator shows the forward voltage drop of a diode. Understanding these display elements is crucial for accurate measurements. The display automatically adjusts brightness for optimal visibility in various lighting conditions, enhancing usability and ensuring clear readings.
Basic Measurements with the Fluke 87 III
Fluke 87 III excels at fundamental electrical measurements, including precise voltage, current, and resistance readings, essential for troubleshooting and general electrical work.
Voltage Measurement (AC/DC)
Measuring voltage with the Fluke 87 III is a core function, supporting both Alternating Current (AC) and Direct Current (DC) voltage readings. To begin, select the appropriate voltage range on the rotary dial – ensuring it exceeds the expected voltage to be measured for optimal accuracy and safety;
Insert the black test lead into the COM (common) jack and the red test lead into the VΩmA jack. Connect the test leads in parallel with the circuit or component under test. The Fluke 87 III automatically detects AC or DC voltage, displaying the reading on the screen with the appropriate unit (V for volts).
Always exercise caution when measuring voltage, especially in high-voltage environments. Double-check the selected range and lead connections before applying power. The multimeter is designed for professional use and provides reliable readings when used correctly, aiding in efficient troubleshooting and electrical analysis.
Current Measurement (AC/DC)
Measuring current, whether AC or DC, requires a different setup than voltage measurements with the Fluke 87 III. First, select the appropriate current range on the rotary dial, again ensuring it exceeds the expected current for accuracy and to prevent damage to the meter or circuit.
Move the red test lead to the mA or A jack, depending on the anticipated current level. Important: Always break the circuit to insert the multimeter in series for current measurement. Connecting the meter in parallel will create a short circuit!
The Fluke 87 III automatically detects AC or DC current, displaying the reading with the appropriate unit (mA for milliamps, A for amps). Prioritize safety; be mindful of the circuit’s potential current levels and use appropriate fusing. Proper technique ensures accurate readings and protects both the meter and the user.
Resistance Measurement
Measuring resistance with the Fluke 87 III is straightforward, but requires the circuit to be de-energized. Never measure resistance in a live circuit, as this can damage the meter and pose a safety hazard. Select the resistance (Ω) range on the rotary dial, starting with the highest range and decreasing as needed for better resolution.
Connect the test leads to the component or circuit whose resistance you wish to measure. The Fluke 87 III will display the resistance value in ohms (Ω), kilohms (kΩ), or megohms (MΩ).
For accurate readings, ensure no other components are influencing the measurement. Consider isolating the component if necessary. Remember that lead resistance can affect low-resistance measurements; use relative mode to compensate if needed. Always double-check the circuit is off before proceeding.
Advanced Features and Functions
The Fluke 87 III offers expanded capabilities beyond basic measurements, including continuity testing, diode tests, and frequency measurement for detailed analysis.
Continuity Testing
Continuity testing with the Fluke 87 III verifies if a complete electrical path exists between two points in a circuit. This function emits an audible tone when resistance is below a set threshold, typically around 30 ohms, indicating a closed circuit.
To perform a continuity test, select the continuity mode (often denoted by a diode symbol with a sound wave) using the rotary dial. Connect the test leads to the two points you wish to test. If the circuit is complete, a beeping sound will confirm continuity.
This feature is invaluable for identifying broken wires, faulty connections, or closed switches. Remember to disconnect power from the circuit before testing for continuity to avoid damaging the multimeter or causing personal injury. Always ensure the circuit is de-energized for safe and accurate results.
Diode Test
The Diode Test function on the Fluke 87 III allows you to check the forward voltage drop of a diode. A healthy diode should exhibit a forward voltage drop typically between 0.5V and 0.8V when tested in the forward direction.
To perform a diode test, select the diode mode (usually indicated by a diode symbol) on the rotary dial; Connect the red test lead to the anode (positive side) and the black lead to the cathode (negative side) of the diode. A reading within the expected range confirms a functioning diode.
If the reading is “OL” (Overload) or very low, the diode is likely open or shorted, respectively. Reverse the leads; a healthy diode should show “OL” in the reverse direction. This test helps identify faulty diodes in electronic circuits, crucial for troubleshooting and repair.
Frequency Measurement
The Frequency Measurement function of the Fluke 87 III determines the number of cycles per second (Hertz) of an AC signal. This is invaluable for analyzing waveforms and identifying signal characteristics in electronic circuits and systems.
To measure frequency, select the frequency (Hz) mode on the rotary dial. Connect the test leads to the circuit under test, ensuring proper polarity if applicable. The display will show the frequency of the AC signal in Hertz (Hz).
The Fluke 87 III can measure frequencies across a wide range, making it suitable for various applications. Accurate frequency measurements are essential for troubleshooting timing issues, verifying signal integrity, and diagnosing problems in electronic devices. Remember to consider the input impedance when measuring high-frequency signals.
Troubleshooting and Safety
Prioritize safety when using the Fluke 87 III; understand potential hazards and follow guidelines to prevent electrical shock and ensure accurate measurements.
Common Issues and Solutions
Display Problems: If the display appears dim or shows unusual characters, first check the battery level and replace if necessary. A low battery is a frequent cause of display issues. If the problem persists after a battery change, there might be an internal component failure requiring professional service;
Incorrect Readings: Ensure the test leads are securely connected to the correct terminals and the function dial is set to the appropriate measurement type (AC/DC voltage, current, resistance). Faulty test leads can also cause inaccurate readings; inspect them for damage and replace if needed.
Continuity Beep Not Working: Verify the continuity threshold is set correctly. Sometimes, a high resistance connection might not trigger the beep. Also, ensure the test leads are making good contact with the circuit being tested. If the issue continues, the buzzer itself may be faulty.
Meter Doesn’t Power On: Confirm the battery is correctly installed with the proper polarity. If the battery is new and correctly installed, the power switch might be defective, necessitating repair by a qualified technician.
Safety Precautions and Guidelines
Electrical Shock Hazard: Always exercise extreme caution when working with electrical circuits. Never exceed the multimeter’s specified voltage and current ratings. Disconnect power before measuring resistance or continuity. Use insulated test leads and wear appropriate personal protective equipment (PPE), including safety glasses.
Measurement Category Awareness: Understand and adhere to the measurement category ratings (CAT I, CAT II, CAT III) to ensure the meter is used within its designed safety limits. Using the meter in an incorrect category can lead to hazardous situations.
Proper Lead Usage: Inspect test leads for damage before each use. Replace any damaged leads immediately. Avoid touching the metal parts of the probes when measuring live circuits. Ensure proper grounding to prevent electrical shock.
General Safety: Do not use the meter in wet or humid environments. Avoid dropping or subjecting the meter to strong impacts. If the meter appears damaged, discontinue use and have it inspected by a qualified technician.
Fluke 87 III Specifications
This multimeter boasts robust electrical and physical characteristics, designed for professional use, ensuring accuracy and durability in diverse industrial and field applications.
Electrical Specifications
The Fluke 87 III exhibits exceptional electrical performance, offering a DC Voltage range of 200.0 mV to 1000 V, with an accuracy of ±0.09%. AC Voltage measurements span from 200.0 mV to 1000 V, also maintaining ±0.09% accuracy.
For current measurements, DC Current ranges from 200.0 μA to 10.00 A (20 A for 30 seconds), with accuracy reaching ±0.1%. AC Current measurements cover 200.0 μA to 10.00 A, mirroring the DC accuracy.
Resistance measurements are precise, ranging from 200.0 Ω to 40.00 MΩ, with an accuracy of ±0.1%. Continuity testing provides a rapid response, and diode testing offers a forward voltage drop test. Frequency measurements extend up to 200 kHz, ensuring comprehensive electrical analysis capabilities for professionals.
Physical Specifications
The Fluke 87 III is designed for field use, boasting a robust and portable construction. Its dimensions are approximately 224 mm (H) x 89 mm (W) x 48 mm (D), making it easily manageable in various work environments.
Weighing in at around 840 grams (including batteries), the multimeter offers a balance between durability and portability. It’s built to withstand drops and harsh conditions, ensuring reliability on the job site.
The instrument features a tilt stand for convenient hands-free viewing. It operates effectively in temperatures ranging from -20°C to +55°C, and can be stored safely within a temperature range of -40°C to +60°C. Its rugged design and comfortable grip enhance usability for extended periods.