Category: News

Non-Contact Infrared (IR) Thermometers

Take temperature measurements from a safe distance with Fluke infrared thermometers.

Do not get burned by a motor. Always avoid hot and cold air blowing in your face from your HVAC system or blowers while taking measurements. For more safety precautions, trust in Fluke infrared thermometers to get accurate temperature readings from a safe distance.

Visit our website at Thermometers Archives – Presidium PH to know more about our products our contact us at +63282515165 / +63282570795.

You could shop at our official store:

Shopee: Presidium.Ph Corporation, Online Shop | Shopee Philippines

Lazada: Presidium.Ph Corporation | Lazada PH

There are a lot of airborne particle forms ranging from animal dander, plant pollen, and airborne bacteria, to fiberglass, asbestos, and combustion particles that are generated from part of the production equipment or process. To properly identify and troubleshoot IAQ problems, the technician needs a tool that not only reads particle concentrations for a spot check but also provides continuous monitoring for process control.

Indoor air quality is highly important and monitoring it is made more easy and possible with the Fluke Air Particle. In the highly sensitive environment of a healthcare facility, where both infection patients and those highly susceptible to infection receive treatment, it is essential to minimize the possibility of infection and disease transmission.

The particle counter can provide facilities managers with the data they need to detect IAQ problems, identify and address root causes, and verify when conditions have returned to the right level.

Importantly, a particle counter enables the healthcare facility manager to:

  1. Document baseline particle counts within a specific area.
  2. Detect when airborne particulate levels diverge from baseline or “normal” levels to keep the levels intact.
  3. Have an early warning of underlying issues, such as changes in operating procedures, equipment malfunctions, maintenance shortcomings, or failure to separate construction zones from patient areas.
  4. Test particle levels after changes have been made to ensure that remedies have been effective.

Different locations have varying levels of acceptable particulate concentrations. In a residential and commercial environment (i.e. homes, offices, hotels), health and comfort concerns and fear for litigation often drive IAQ investigations. In industrial and institutional environments (hospitals, food and beverage plants, electronic and precision manufacturing), energy cost, contamination control, and production yields are the primary concern.

Excessive levels can result in medical conditions such as Sick Building Syndrome, lower productivity, contaminated product, or all of the above. Maintaining acceptable air quality levels not only lower the costs associated with downtime but also reduce or remove costs associated with expensive fixes in the future.

The first step in establishing an IAQ maintenance program is to determine if a problem currently exists. Controlling airborne contamination within healthcare facilities poses a complex set of challenges more than what is mentioned. Numerous additional resources are available to help the professional understand and overcome those challenges. Among those easiest to grasp is the Fluke 985 handheld airborne particle counter.

The key to a successful IAQ investigation is to be aware of the environment as a whole.

Presidium PH’s one of the best product is the Fluke 985, a powerful, rugged, and easy to use tool to assist the technician in identifying particulate problems and authenticating the efforts to address their root cause.

Shop Now: Fluke 985 Particle Counter – Presidium PH or contact us +63282515165 / +63282570795.

Transients and voltage unbalance

The electric control issues that most recurrently affect industrial plants contain voltage sags and swells, harmonics, transients, and voltage and current unbalance.

In a balanced three-phase system, the phase voltages must be equivalent or very close to equal. Unbalance or imbalance is a measurement of the difference of the phase voltages. Voltage imbalance is the measure of voltage differences between the phases of a three-phase system. It worsens the performance and shortens the life of three-phase motors.

The impact of the transients on motors can be severe. Motor winding insulation can break down, which can then lead to costly early motor failure and unplanned downtime.

 

Testing for transient voltage in motors

Transient voltages are temporary unwanted spikes or blips of voltage in an electrical circuit that can come from any number of sources either inside or outside of an industrial plant.

Adjacent loads turning on or off, power factor correction capacitor banks, or even distant weather can generate transient voltages on distribution systems. These transients, which vary in amplitude and frequency, can erode or cause insulation breakdown in motor windings

Discovering the source of these transients can be challenging because of the frequency of the occurrences and the fact that the symptoms can present themselves in different ways. For example, a transient may appear on control cables that do not necessarily cause equipment impairment directly but may interrupt operations.

The best opportunity to classify and measure transients is to use a three-phase power quality analyzer with a transient function, such as the Fluke 438-II Power Quality and Motor Analyzer. The transient function on the meter is set to great than 50V above the normal voltage. The meter’s display will then show the potentially problematic voltage above 50V – the transients.

If there are no transients found in an initial measurement, it is good training to measure and log the power quality over time with an advanced industrial power quality logger, like the Fluke 1750 Three-Phase Power Quality Logger.

 

What causes unbalanced voltage?

An unbalanced three-phase system can cause three-phase motors and other three-phase loads to experience poor performance or premature failure because of the following:

  • Mechanical stresses in motors due to lower than normal torque output
  • Higher than the normal current in motors and three-phase rectifiers
  • Unbalance current will flow in neutral conductors in three-phase wye systems

Voltage unbalances at the motor terminals causes high current to unbalance, which can be six to 10 times as large as the voltage unbalance. Unbalanced currents turn to torque pulsation, increased vibration and mechanical stress, increased losses, and motor overheating. Voltage and current unbalance could also specify maintenance problems such as unfastened connections and worn contacts.

Unbalance can occur at any point throughout the distribution system. Loads should be equally divided across each phase of a panel board. Should one phase become too heavily loaded in comparison to others, the voltage will be lower on that phase. Transformers and three-phase motors fed from that panel may run hotter, be unusually noisy, vibrate excessively, and even suffer premature failure.

 

How to calculate voltage unbalance?

The calculation for defining voltage unbalance is straight forward. The result is the percentage unbalance and can be used to determine the next steps in troubleshooting motor issues. There are three steps in the calculation:

  1. Determine the voltage or current average
  2. Calculate the largest voltage or current deviation
  3. Divide the maximum deviation by the average voltage or current and multiply by 100 % unbalance = (Max deviation from average V or I/average V or I) x 100

A manual unbalance calculation is a point-in-time determination of voltage or current unbalance. A motor drive analyzer like the Fluke 438-II will show voltage or current unbalance in real-time, including any variations in unbalance.

Get to know more of the product: Fluke 438 – II Three-Phase Power Quality and Motor Analyzer – Presidium PH

Electrical Transmission Cables

Electricity is transmitted and distributed from generation plants to users, it goes through various sections of low voltage which is below 1000 V, and the high voltage more than 1000 V cables. Additionally, these transmission cables are used to connect secondary outputs of current transformers located at both ends of the transmission stations.

In order to protect critical equipment and avoid the increase of faults that can impact the entire transmission network, the pilot cable’s purpose is to monitor any unbalances between the corresponding pairs of CT, which signify fault conditions. While only one pair of wire is needed to complete the connections, operation, and redundancy planning call for a minimum of three functional pairs of wire at any one time.

It is not possible to have a single cable that spans the distance between substations. As result, various joints are formed to connect different sections of cables together. These joints are the weakest links in the system, for they are prone to failures caused by environmental factors such as thermal stress and moisture absorption. The failures will show up when current readings taken at the secondary of CT deviate from the proportional primary current readings

When a failure is detected, the utility team is called to fix the problem. They go through the sub-station from one end to another in order to isolate the affected CT and pilot cable located at the substation. Then they need to travel to the sub-station at the other end to check the insulation resistance of the pilot cable. The wires that were used must be checked as well as the remaining 4 or 9 pairs of wires in the same bunch of pilot cable and make sure at least three pairs are functional. Because some wires may have permanent damage, there are chances that different color wires are mixed in order to achieve the minimum 3 functional pairs. Therefore, the team must verify the exact inter-connect pairs and they term this work as phasing. When a joint is detected as faulty it will be cut out and a shorter jumper cable will be added and two new cable joints are formed.

Time is one of the most important things to consider when repairing because the maintenance team is always hard-pressed to finish troubleshooting and repairs in a short period of time. If you are looking for a versatile tool that can perform insulation resistance as well as voltage measurements and continuity checks Fluke 1587 Insulation Multimeter is the solution. Visit https://presidium.ph/ to learn more about our products.

What is an Oscilloscope?

In the industrial world, devices that turn electric power to mechanical power are commonplace. Some examples of these include pumps, motors, conveyors, robots, and more. These devices are being controlled by an important yet invisible force called Voltage signals. But what are Voltage signals and how do we capture them?

 

An oscilloscope or scopes are an important tool for electronics engineers or testers. They enable waveforms to be seen and because of this, is useful in looking for any problems in the electronics circuit. The name comes from the fact that oscillations can be viewed. Its name draws origins from the name cathode-ray oscilloscope (CRO) when it was still used, as seen in the old televisions due to the high voltages it needed.

 

Oscilloscopes display in waveforms the voltage signals, which is a visual representation of the variations of voltage. One can think of the waveform as ripples traveling along a surface of the water when a stone or object is dropped on it. The signals are then plotted on a graph which shows how the signal changes. The vertical (Y) axis shows the voltage magnitude while the horizontal (X) axis shows time.

 

Some other information you can see in the graph of an oscilloscope include:

  • Voltage signal shape when operating as intended
  • Current signal shape when using a current clamp suitable for using on an oscilloscope
  • Anomalies on the signal
  • Amplitude modulation of an oscillating signal and any frequency variations
  • Whether the signal has noise and the changes to the noise

 

As an item used in electronics test equipment, it helps give insight into circuit operations and is the key to finding many issues and resolving them. Most of the modern oscilloscopes are digital which allows for a more detailed and accurate signal measurement as well as fast calculations, data storage capabilities, and even automated analysis. Handheld digital oscilloscopes such as the one by Presidium, offer more advantages over the benchtop models such as it being battery operated, that it uses electrically isolated floating inputs and the advantage of added features that make its usage easier and more accessible to many different workers.

 

Visit our website at  https://presidium.ph/product-category/products/fluke-industrial-group-tools/portable-oscilloscopes/ to know more about our oscilloscope products or contact us +63282515165 / +63282570795.

Types of clamp meters

Clamp meters are an electrical test tool that incorporates a basic digital multimeter with a current sensor. Clamps measure current. On the other hand, Probes measure voltage. Having a hinged jaw built into an electrical meter allows the technician to clamp the jaws around a cable, wire, and other points in an electrical system. It measures the current in the circuit without the risk of disconnecting it. Below their plastic moldings, hard jaws contain ferrite iron built to concentrate, measure, and monitor the magnetic field generated by current as it goes through a conductor.

Clamp Meters also known as clamp-on ammeters, have three types of categories.

Current Transformer

A Current Transformer is a type of instrument transformer that is engineered to produce an alternating current in its secondary, which is proportional to the AC current in the primary. This is used when a current or voltage is too high to measure directly. The secondary current is used for measuring instruments or processing in electronic equipment, which needs isolation between primary and secondary circuits.

Hall Effect

Hall Effect clamp meters can measure both ac and dc current up to the kilohertz which is 1000 Hz range. Similar to current transformer types, Hall Effect clamp meters use rigid iron jaws to concentrate the magnetic field that encircles the conductor being measured. Compared to current transformer clamp meters the jaws are not wrapped by copper wires. Instead, the magnetic field produced by the conductor is focused across one or more gaps in the core after the jaws are clamped around the conductor.

Flexible

Flexible clamp meters evolved from the simple solenoids and were used first during 1912. Compared to the Current Transformer and Hall Effect clamp meter, the flexible clamp meter does not have an iron core. Instead, they use a wound, helix-shaped coil which reacts to the rate change of a conductor’s magnetic field around which they are placed. The faster the change in amplitude, the more voltage generated by a coil. The integrator circuit in the measurement device transforms that output to a signal that’s proportional to the signal in the conductor.

While clamp meters have different types, they all have the same fundamental methodology when making measurements. A conductor is passed through a probe whether it be the hard jaws built into the clamp meter, a flexible coil of clamp accessory, and a vector sum of currents flowing through the conductor is measured by the meter.

Fluke offers 323 clamp meter which is a good basic troubleshooting tool for commercial and residential electricians. It includes True RMS measurements, optimized ergonomics, and a large display for efficient troubleshooting. It’s designed to perform in the toughest environments and provide noise-free, reliable results, so you can trust it to help you confidently diagnose problems almost anywhere. Reach us through https://presidium.ph/product-category/products/fluke-industrial-group-tools/clamp-meters/  to know more about our clamp meter products.

Electrical Safety Standards

Electricity is a powerful form of energy. Following electrical safety standards’ highly important, especially that there is electricity involved which is dangerous and deadly if not properly respected.

Presidium will help build a proper multimeter to protect anyone against electrocution, arc explosion, and other unnecessary incidents. A well-built-multimeter will carry a Measurement Category III rating and third-party certification of an independent test lab.

Furthermore, if the meter is not regularly rated and doesn’t have proper certification, no protection is guaranteed and it will eventually lead to insulation breakdown or arc explosion.

The main reason why Presidium carries out Fluke Industrial Group tools and Fluke Calibration is that it takes the process of measuring and performance of products very seriously. All Fluke’s test and measurement tools are of high quality and exceed the expectations and safety requirements of a Product Compliance Laboratory.

To be simplified by Mr. Thomas Smith, A Product Compliance Manager, “We put the tools through a variety of foreseeable use and misuse scenarios replicating the conditions we’ve learned from our customers and Once we know the tools demonstrate sufficient safety margin and robustness here, we can be confident in knowing they’ll provide a high level of protection in the real world.

Fluke Products undergoes a series of performance and safety tests and is certified by a third party. All of the products are either baked, frozen, dunked in water, choked by dust clouds, rattled with vibration, bashed on the floor, and zapped with electricity repeatedly.

Testing for safety and reliability

The Fluke Product Compliance Laboratory is filled with different workstations jutting out from the ceiling, walls, and down to the center of a large bright room. Safety engineers’ experts who are testing protocols and safety standards push Fluke tools and instruments to its limit and even up to its breaking point. We test at least one level beyond the standard. Additionally, our work in foreseeable misuse has led to the development of new standard requirements.” Smith, added.

Fluke takes advantage of a variety of tests just to find design weaknesses and errors that can be arranged and fixed for the final instrument, providing and utilizing protection as much as possible to avoid dangers of working with electrical systems.

Presidium PH Corporation is an authorized distributor of Fluke Industrial Group and Fluke Calibration products in the Philippines. Having said that Fluke Corporation is the world leader in the manufacture, distribution, and service of electronic test tools, biomedical equipment, and networking solutions. Fluke Product Compliance Laboratory is accredited through CSA to test and certify products for their certification mark. Test procedures are laid out in detail and adhered to rigorously. Once a product has passed the appropriate tests, documentation is sent on for approval and registration.

Fluke works with all nationally recognized test labs (NRTLs) such as the: CSA (Canadian Standards Association), The Fluke Products are accredited through CSA to test and certify products for their certification mark. The test procedures are laid out in detail and adhered to rigorously and once a product has passed the appropriate tests, documentation is sent on for approval and registration.

Fluke is also in partnership with the UL (Underwriters Laboratories), TÜV (Technischer Überwachungs-Verein), and ETL/Intertek. The Fluke lab is frequently audited to ensure that testing meets the requirements imposed by the national and international authorities and standards. All tests are precisely calibrated and set up to meet the requirements of the relevant standard.

All high-quality test instruments should undergo similar testing. Let’s talk about the example approaches of Fluke testing:

Impulse test

The first test is the impulse test that simulates a transient on an electrical installation from nearby lightning strikes or other large electrical disturbances from the switchgear. To test it a meter is placed in a chamber and injected with a pulse of thousands of volts of electricity, to verify whether the meter protection will breakdown, tear up, or arc over. For this testing, a special test machine is used to generate the high voltage transient and fault current as defined by international and national standards.

Multi-Functional overload test

A test instrument should also undergo an inspection to make sure that it is able to withstand accidental overloads associated with the various functions of the meter. This is written into the current safety standards and is a very important protocol. Fluke does this by utilizing the multi-functional overload test. This test involves injecting a high percentage of energy voltage into non-voltage measurement functions, testing for a case in which an operator mistakenly sends voltage into a non-voltage meter function. This mostly occurs if the user leaves the leads in the amps input jacks and then accidentally connects the leads across a voltage source: they have just created a short through the test instrument.

Highly accelerated lifetime test (HALT)

To guarantee the lastingness and permanence of its tools, Fluke uses HALT. This test is a combination of using a high-frequency 6-axis vibration at more than 150 GRMS (root-mean-square acceleration) with extremely fast temperature swings to simulate a lifetime of wear and tear. The chamber has the capability of going from -100 °C (-148 °F) to 200 °C (392 °F) in minutes, testing the tool’s ability to withstand elevated and combined stresses.

Transport under rugged conditions

Another important test to be done is to simulate meters when they are being transported in rugged and rough conditions, such as in off-road vehicles used by the military. To test this, engineers place the meter on a vibration table where it is shaken at over 3 GRMS for at least 30 minutes per axis, repeatedly. At Fluke, one test is never enough that’s why meters are tested in several positions to account for all circumstances.

Other tests to be done are:

  •         Anechoic chamber lab test – To withstand radiated electromagnetic interference without displaying erroneous readings, and do not emit disruptive radiation.
  •         Drop test – To withstand surprises of breaking even at the lowest temperature rating of the product.
  •         Electrical static discharge (ESD) – To withstand static electricity.
  •         Ingress Protection (IP), Dust, and Water tests – To test resistance to dust intrusion and water (dripping, spraying, and submersion depending on the rating), respectively.
  •         Temperature/humidity/altitude chambers – To test resistance to atmospheric extremes.

Safe handling, bringing safety home.

The first thing to avoid is the industrial outage that could affect hundreds of employees, terminate equipment worth millions, and bring production and revenue to closure. It is highly important to have a maintenance team to rely on especially with tools that are tough enough to survive the dust, water, falls, and impacts common in industrial settings. All professionals would demand to see the same level of accuracy, performance, and reliability form their tools. The main reason why Fluke test and measurement tools are designed to be.

Safety standards to live by

The Switzerland-based International Electro-technical Commission (IEC) 61010 has established the Measurement Category or what you’ll be familiar with (CAT) and they also have voltage ratings for electrical environments. These CAT ratings are based on how high-energy transient travels through the network resistance of the electrical installation. The ratings will help determine what electrical test tools have been designed to withstand voltage transients for the specific job type.

  • CAT II – A single-phase receptacle-connected loads such as appliances and portable tools.
  • CAT III – The 3-phase distribution including single-phase commercial lighting and equipment in fixed locations such as switchgear and polyphase motors
  • CAT IV – The 3-phase at the utility connection, outdoor conductors, electricity meters, and service entrances.

To be exact, a high CAT number will refer to an electrical environment with higher power available and higher energy transients. Thus, a multimeter designed to a CAT III standard is resistant to higher energy transients than one designed to CAT II standards.

Forensic investigations have determined that without a Measurement Category rating of interior test equipment that does not match the task will lead to an explosion if not used properly. Therefore, making sure that your electrical testing tools have been independently evaluated to survive voltage transients and certified to meet safety standards is a must. Standardization bodies, such as the IEC and NFPA, are not responsible for enforcing their test tool safety standards and any test instrument you use should be labeled to indicate it has been certified by at least one independent testing agency.

Let’s admit that even the most careful person can make mistakes that’s why electrical safety standards are important. Test instruments should help back you up with a margin of protection if an inappropriate voltage is applied. To meet the demands of today’s high-energy, high-hazard workplace, quality manufacturers like Fluke continue to improve their test instruments to make them safer and more reliable. Fluke goes a step further in designing and building our test tools with stout input protection, our test instruments are built to survive and is also focused on your safety.

Here are five mistakes to avoid in the field:

  1. Don’t use outdated or defective test equipment.
  2. Never neglect to properly inspect test instruments and test leads for damage or

possible contamination.

  1. Don’t use the improperly rated test tools for the job.
  2. Don’t replace original fuses with inadequate ones.
  3. Don’t work on a live voltage without proper preparation.

It’s vitally important to take safety precautions when working with electricity. Safety must not be compromised and some electrical safety must be followed. Organizational measures and safety standards help avoid and prevent harmful and dangerous circumstances.

We at Presidium Corporation are ready to support you with highly qualified products and trained specialists! We carry the latest technology products and can cater to most industries in the Philippines. Want to know more about our products? Contact us now +632 82515165. Or visit our website at www.presidium.ph

What are Hall Effect (ac, dc) clamp meters?

In measuring both ac and dc current, Hall Effect clamp meters can measure up to kilohertz (1000 Hz) range. With the same current transformer types, Hall Effect clamp meters use rigid iron jaws to deliberate the magnetic field that encompasses the conductor being measured.

The jaws are not wrapped by copper wires, not the same as current transformer clamp meters. In addition, the magnetic field produced by the conductor is absorbed across one or more gaps in the core after the jaws are clamped around the conductor. The point where the jaw tips of a Hall Effect clamp meter meet.

When the jaw tips of a Hall Effect clamp meter meet, a gap exists. It creates an air pocket that the magnetic field (aka magnetic flux) must jump. The core will not saturate when the gap limits the magnetic flux.

In contrast, the jaws of an ac-only current transformer clamp are flush when closed. When opened, the tips of the jaws show bare metal core faces.

Within the gap, there’s a thin plastic molding covering the semiconductor known as a Hall Effect sensor – it is a transducer that differs its output voltage when reacting to magnetic fields, in this case, the magnetic field of the conductor or wire being measured. The objective is to measure the magnetic flux directly. The output voltage from the sensor then improved and mounted to represent the current flowing through the conductor that lies inside the jaws of the clamp.

How the Hall Effect clamp meters work

While the current flows within the conductor that are being measured, the iron core is formed by the jaws of a Hall Effect clamp meter permits the magnetic field to effortlessly pass through, making it more easily.

In the case of the magnetic field (flux) that comes to that small air gap in the tips of the jaw, the field must jump that gap. When the gap is small, the field stays determined across the gap, and the Hall Effect sensor, which sits in the gap—produces a voltage proportional to the magnetic flux in the gap that the clamp transforms into a current reading.

Of all Hall Effect devices, the dc magnetic fields are concentrated through the core – like a permanent magnet sticking iron. Clamps require the reading to be “zeroed” before taking a measurement to eliminate offsets because the dc magnetic field of the earth and the possibility of other magnetic fields near the measurement site

To learn more about clamp meters, visit https://presidium.ph/product-category/products/fluke-industrial-group-tools/clamp-meters/.

Electrical Transmission Cables

As electricity is transmitted and distributed from generation plants to the end-users, it passes through numerous sections of low voltage (below 1000 V) and high voltage (defined in Singapore as more than 1000 V) cables.

In addition to these transmission cables, pilot cables (which consist of 5 pairs or 10 pairs of color-coded wires) are used to connect the secondary outputs of current transformers (CT) deployed at both ends of the transmission stations (also known as sub-stations).

To safeguard sensitive equipment and avoid the escalation of faults that may distress the entire transmission network, these pilot cables assist to detect any unbalances between the corresponding pairs of CT, which indicate fault conditions. Whereas only one pair of wire is required to complete the connections, operation, and redundancy planning call for a minimum of three functional pairs of wire at any one time.

It’s unbearable to have a single cable that spans the vast distance between sub-stations. The result comes numerous joints are formed to link different sections of cables together. Such joints are the weakest links in the system because they are imperiled to failures affected by environmental factors that include thermal stress and moisture absorption. The failures will highlight when current readings taken at the secondary of CT deviate from the proportional primary current readings.

During such failure is recounted, the utility’s maintenance team is entitled to repair the fault. They have to travel to the sub-station at one end to separate the affected CT and pilot cable at that sub-station. Then they need to travel to the sub-station at the other end to check the insulation resistance of the pilot cable. In this condition, the acceptable insulation resistance is 10 Mohms minimum with 500 V DC applied.

While they are at it, they will check the pair of wires that have been used, as well as all the remaining 4 or 9 pairs of wires in the same bunch of pilot cable, and ensure at least three pairs are functional. However, some wires may have permanent damage, there are prospects that different color wires are mixed in order to attain the minimum 3 functional pairs. As a result, the team must validate the exact inter-connect pairs and they term this work as “phasing”. This is done by examining the continuity of the respective wire pairs. When a joint is verified faulty, it will be cut out and a short jumper cable will be added and two new cable joints are formed.

Afterward, insulation resistance as well as “phasing” must be checked again to ensure no abnormality.

In addition to reported faults, the same tests can be assigned by a new extension of cables, or diversion of cables due to civil engineering works (ie. new housing project development). Time is a perilous consideration as the maintenance team is always hard-pressed to complete the troubleshooting and repairs in the shortest possible time. They find the Fluke 1587 Insulation Multimeter a very multipurpose tool as it can perform insulation resistance tests as well as voltage measurements and continuity checks.

Get to know more of the product Fluke 1587 https://presidium.ph/product/1587-insulation-multimeter/ or email us at info@presidium.ph

How To Measure Signals Using Test Probes

To measure ac or dc voltage:

  1. Turn the meter’s dial to the proper voltage function ().
  2. Link the black test lead to the COM terminal and the red test probe to the V terminal, specified by on the Fluke 381.
  3. Measure the voltage by moving the probes to the desired test points of the circuit.
  4. View the reading in the display.

To measure resistance or continuity:

  1. Turn the dial to.
  2. Remove power from the circuit being tested.
  3. Connect the black test probe to the COM terminal and
  4. The red test probe to terminal.
  5. Measure the resistance by moving the probes to the desired test points of the circuit.
  6. View the reading on the display.

If the resistance is < 30 Ω, continuity is indicated by a beeper continuously sounding. If the display reads OL, the circuit is open or the resistance being measured is greater than the meter’s resistance range.

To measure frequency (on the Fluke 381):

  1. Turn the dial to.
  2. Align to the center the jaw or flexible probe around the measurement source.
  3. Push the yellow shift button (‍on the Fluke 381) to shift to Hz.
  4. View the measurement in the display.

To measure capacitance (on Fluke 370 series clamp meters)

  1. Turn the dial to.
  2. Remove power from the circuit being tested.
  3. Connect the black test probe to the COM terminal and the red test probe to the terminal.
  4. Measure the resistance by touching the probes to the desired test points of the circuit.
  5. View the reading on the display.

Remember, the more you use, the more familiar you become in measuring signal using test probes. Visit our website at www.presidium.ph to know more about our products.

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