Calibration instruments calibrate sensors and meters by using electrical signals or physical quantities.  AC voltage, DC voltage, AC current and DC current are common calibration signals.  Devices that produce electrical signals serve as meters for sensor calibration and send output signals to other devices.  Selecting calibration instruments requires an analysis of thermodynamic, environmental, process, electrical and physical properties.  The new powerful Fluke 725 Multifunction Process Calibrator will equip you with what you need to process almost any parameter.

The Fluke 725 measures and sources mA, volts, temperature (RTDs and thermocouples), frequency, ohms and pressure.  They do this by using optional pressure modules.  The split display will also let you view input and output values simultaneously.  For valve and I/P tests, you can source mA while measuring pressure.  This useful tool also has auto-stepping and auto-ramping for remote testing.  You will be able to support flow meter testing, frequency and CPM functions along with powering transmitters.  This process is done during a test using loop supply with simultaneous mA measurement.  Another great feature is the handling of fast pulsed RTD transmitters and PLCs, with pulses as short as 10ms.

Carrying the Fluke 725 with you is easy due to the small, streamlined shape.  It is one of the most durable and reliable calibrators on the market.  The screen is very easy to read and even has a backlight when working in darkness or poor light.  Memory options are useful for storing frequently used test setups.  This memory function allows for a fast set up.

Fluke Corporation is a world leader in the manufacture, distribution and service of electronic test tools and software. They have achieved the number one or number two position in every market they compete in. The Fluke brand has a reputation for portability, ruggedness, safety, ease of use and rigid standards of quality.  We highly recommend the Fluke 725 Multifunction Process Calibrator.   With the simple operation, broad testing options and rugged design, it will work as hard as you do.

Infrared Cameras have a variety of uses and applications. Here at Texso Instruments, we have a wide selection of thermal imaging cameras for beginners to seasoned professionals. We want to offer a few tips and tricks on getting the most out of your camera or thermometer.
 

Lens cleaning and camera maintenance are also extremely important factors. The body of the camera, cables and accessories can be cleaned simply by wiping with a soft cloth. If a stain exists, moisten the cloth with a mild detergent, followed by a dry soft cloth. Never use chemical products on the camera or any cables and accessories for it will lead to deterioration. When cleaning the lenses, first blow off loose dirt with a can of compressed air, and gently clean the lenses surface with a cotton ball, soft cloth, or kleenex. Keep in mind excessive cleaning can break down the coating.

Our selection of infrared cameras are from the best manufacturers who manufacture extremely high quality equipment. We are confident you will be extremely satisfied with your selection. Use these helpful hints to get the most out of your camera.

What is a Megohmmeter?

Megohmmeters, more commonly known as “Megger Meters” are used to measure high insulation resistance.  Megger has become the generic description for a high voltage, low current insulation tester.  Ohmmeters and multimeters seem to be capable of similar measurements; however, only a Megger type instrument can test the quality of the insulation at or above its operating voltage.  Two basic tests are possible; insulation to ground and insulation between conductors.

How Do Megohmmeters Work?

The megger consists of a DC generator and a direct reading ohm meter.  The moving element of the ohm meter has two coils (A& B) which are firmly mounted to a pivoted central shaft and free to rotate over a C-shaped core.  Flexible leads connect these coils.  When current provided by the hand generator flows through Coil B, the coil will set itself at right angles to the field of the permanent magnet.  When the test terminals open and an infinite resistance is given, no current flows in Coil A which causes Coil B to govern the motion of the rotating element, causing it to move in the extreme counter-clockwise position, which is marked as infinite resistance.  The choice of test voltage is usually determined by the operating voltage of the circuit under test.

What are Safety Precautions When Using a Megohmmeter?

* Never touch the test leads when the handle is being cranked

* Always deenergize and discharge the circuit completely prior to connecting the meter

* Use megohmmeters for high-resistance measurements only

* When possible, disconnect what is being checked from other circuitry before using the meter.

What Level of Voltage can a Megohmmeter Test?

The megohmmeter will test 100, 250, 500, 1000 or 2,500 Vdc, depending on the model.

What is the Difference between Analog and Digital Megohmmeters?

The difference lies in display and interface technologies.  Analog meters display values on a dial, normally using a needle or pointer.  Digital meters display results with a numeric readout.

What are Common Features of Megohommeters?

Megohmmeters can have remote controls to permit control by computers or other instruments.  Some have built in calibration, allowing operators to calibrate test instruments without having to remove them from the testing location.  Most meters have warning indicator lights that work with audible buzzers and alarms to indicate a pass or fail.  Megohmmeters are often interfaced with programmable logic controllers.  Output frequencies are also commonly available, and rapid cutoff circuitry to protect the device from extremely high levels of voltage or current.

What are Applications for Megohmmeters?

A variety of applications exist for this useful tool.  Many meters are used to test the insulation resistance of wires, cables, transformers, and electrical motors.  They can also be used to verify devices such as aircraft fuel pumps meet manufacturer IR specifications.  Other electrical components can be tested as well, including cable reels, rectifiers and solid-state diodes.

“Hipot” is an abbreviation for high potential (high voltage). A Hipot test, also called a Dielectric Withstand Test, checks for good isolation. A hipot tester is an electronic device that verifies the electrical insulation in a cable, transformer, electric motor, printed circuit board or any other wired assembly. This useful tool consists of a source of high voltage, current meter and a switching matrix to connect the high voltage source and the current meter to all of the contact points in a cable.

The main use for Hipot testers is to verify insulation of circuits. To accomplish this test, high voltage is applied between the circuits to verify a lack of current flow. A normal test should connect any circuit in common to ground. Then, the tester disconnects one circuit at a time and connects that circuit to high voltage. The flowing current is tested to make sure the level is low enough. Proper insulation is extremely important for safety and quality of electrical circuits.

The HT-2000 AC Hipot tester 0-2000V, up to 20mA is extremely affordable and user-friendly. One setup will conduct UL-CSA Ground continuity tests and the Hipot test, without a need for additional equipment. AC Hipot testing is best used for medical equipment in patient care areas, products that do not use Y capacitors, fixtures and portable lamps. This tester is also extremely easy to determine results; a green light means pass and a red light with a buzz means fail.

The HT-2800 DC Hipot tester 0=2800V, up to 5mA is extremely easy to operate. This tester conducts UL/CSA Ground continuity and DC Hipot tests with one setup. It will conduct in-depth by testing arc detection and leakage current. The HT-2800 performs the dielectric withstand and ground continuity production line tests required by UL and CSA. DC Hipot testing is best suited for computers, long cables or wires, products using Y capacitors for RFI supression, manufactured homes and telephone central station equipment.

The HTT-1 Hipot and Ground Continuity Function Checker was designed to be extremely reliable, safe and fast in verifying proper operation of Hipot and Ground Continuity Testers between calibration cycles. The user can check the result of the three failure modes encountered in production Hipot and ground circuit testing. These modes include open ground, high leakage current, and dielectric breakdown. The testing can be done separately or in any combination.

All three of these Hipot testers are manufactured by Compliance West USA. They each meet safety agency requirements by UL, CSA, TUV and CE for production line testing at unrivaled prices. They are ranked amidst the fastest and most accurate test equipment on the market.  Hipot testers are imperative to insure safety when working with energized circuits.

Digital Multimeters (DMM’s) Description:

Fluke 116

A digital multimeter is a general-purpose measuring instrument that measures resistance, current and voltage. The meters measure electric current in ampere, volt and ohm. At times you will see multimeters listed as DMMs which simply stands for “Digital Multimeter.” In simpler terms, a DMM is an electronic tape measure for making electrical measurements. They were originally invented in the early 1920’s as radio receivers and other vacuum tube electronic devices became more common. In today’s world, almost all of the electronic products used in our personal and professional lives are built or serviced using multimeters. This handy tool can be a hand-held device useful for basic fault finding and field service work, or it can be used as a bench instrument which can measure to a very high degree of accuracy. Their main function is to troubleshoot electrical problems in a wide array of industrial and household devices such as batteries, motor controls, appliances, power supplies and wiring systems. Digital multimeters have a higher rate of accuracy compared to analog multimeters. The accuracy can be .5% compared to 3-5% for analog meters. It is extremely important to use a quality digital multimeter such as the Fluke 116 HVAC Digital True RMS Multimeter when diagnosing electrical problems.

How to Use a Digital Multimeter:

To measure voltage using a multimeter, plug the probes into the correct jacks on the multimeter. Black is negative and the red will go into the Volt/OHM/Temp jack. Do not put the red into the A or mA. When measuring AC voltage, switch the multimeter rotary switch to the V (wavy line). The reading will display when the probes are touched to the appropriate outlet or wire. When measuring DC voltage, the rotary dial needs to be turned to the V with a solid and broken line over it. When testing low voltage systems (less than 3VDC) use the mV setting. The result will display when the probes are touched to the appropriate area. When measuring resistance, follow the same directions; however, turn the rotary switch to the Ohm sign. Keep in mind the resistor’s rated value can be different than the measured value of a resistor in a circuit. Test leads can add .1% to .2% of error when measuring resistance. Testing the leads can be accomplished by touching the probe tips together and reading the resistance of the leads.

Safety When Using Multimeters:

To prevent the possibility of electric shock or injuries, never measure an in-circuit current when the open-circuit potential to earth is greater than 1000V. If the fuse blows during this type of measurement, the meter can easily be damaged and you have an extremely high risk of injury. It is imperative to check the meter’s fuses prior to measuring current and never to place the probes parallel to any circuit or component. Always use the correct function, range and terminals for all measurements. Remember, no tool by itself can guarantee absolute safety. The combination of the right tool and safe work practices will give you maximum protection. Use the following guidelines to increase safety when using a digital multimeter:

* Work on de-energized circuits when possible, also being careful to use lock-out/tag-out procedures. Always assume the circuite is live.

* Use insulated tools, wear safety glasses or a face shield and insulated gloves.

* Wear flame resistant clothing, and stand on an insulated mat.

* When making measurements on live circuits, hook on the ground clip first, then make contact with the hot lead. Hang or rest the meter when possible versus holding it in your hands.

* Use the three point test method; test a known live circuit, then the target circuit and finally test the target circuit again. This technique double checks that the meter worked properly before and after the measurement.

How to Choose a Multimeter:

The first thing to consider when shopping for a new multimeter is to analyze the worst-case scenario of your job. This will help to determine the category your use or application fits into. You will want to choose a meter that has a rating for the highest category you could be working in. Next, look for a multimeter with a voltage rating for the category that applies. Choosing the right digital multimeter requires evaluation of your basic measurement needs and job requirements, and looking at special features/functions built into the different types. Keep in mind the importance of test leads. The test leads need to be certified to as high or higher of a voltage and category than the meter. Also, look for multimeters and test leads with double insulation, recessed input jacks and test leads with shrouded input connectors. The main factors to consider include:

* Your work environment; voltage level, types of equipment, measurements and applications

* Specialty features/functions; capacitance, non-contact voltage, min-max record, data logging, trending, low impedance mode, frequency and temperature.

* Resolution and Accuracy; 6,000, 20,000 or 50,000 count resolution

Technology is changing rapidly and as electrical and electronic circuitry continues to get more complex, accurate diagnostic tools like digital multimeters are more important than ever. With the wide selection of features, choosing the right meter for the job can be challenging. Always keep safety the number one priority when using and choosing your next multimeter.

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Shock, electrocution, arc flash, and arc blast are responsible for hundreds of worker deaths and thousands of injuries per year in the U.S. alone.  Many of the deaths and injuries are completely preventable with the proper preformed arc-flash analysis and the correct level of personal protective equipment worn.  January 2009 is just around the corner and time is ticking for companies and their workers to comply with NESC (National Electrical Safety Code) rules 410A3 and 42012.  Per NESC Rule 410 A3, “If an arc-flash assessment determines a potential employee exposure greater than 2 cal/cm2 exists2, the employer shall require employees to wear clothing or a clothing system that has an effective arc rating not less than the anticipated level of arc energy.”

In order for workers to be protected with the correct level of personal protective equipment, an arc flash hazard analysis must occur.  The analysis will identify the arc flash protection boundary, the proper ppe necessary, and also appropriate safety-related work practices.  Included in the process is a study of short circuits to determine the available “bolted” fault current at each location.  The study will gather all relevant overcurrent protection device data to accurately predict the clearing time of the arc fault current, and the calculation of arc flash protection boundaries and incident energies, which are used to determine PPE categories.  NFPA 70E (Electrical Safety in the Workplace) is a standard of the National Fire Protection Association that addresses electrical safety requirements for employees. Defined by NFPA 70E, the categories of personal protective equipment workers are required to wear for the work to be performed, based on the incident heat energy calculated at the appropriate working distance are the following:

Category      Cal/cm²      Personal Protective Equipment

0                 1.2            Untreated cotton
1                 5               Flame retardant (FR) shirt and FR pants
2                 8               Cotton underwear, FR shirt and FR pants
3                 25             Cotton underwear, FR shirt, FR pants and FR coveralls
4                 40             Cotton underwear, FR shirt, FR pants, and double layer switching coat and pants

We must keep in mind, the purpose of the new rules is to keep people safe.  Yes, it is tedious, yes it costs money and yes, it can be a nuisance to prepare your company.  The purpose of the NESC is the practical safeguarding of persons during the installation, operation, or maintenance of electric supply and communication lines and associated equipment.  The organization does not create rules to be a nuisance.  Chuck Woodings, a member of the NESC SCC8 subcommittee states, “The intent of the rules is to protect the employee from catastrophic injury and minor injuries if a flash occurs.”

Here at Texso Instruments, our goal is to provide the necessary personal protective equipment for workers, and to help ensure companies are compliant with this deadline.   We offer many types of PPE, and all categories of clothing to protect from arc flash dangers.    A lot of confusion exists regarding proper protection and categories of clothing.  January 1, 2009 is quickly approaching, and compliance is mandatory, not a choice.  Let us help keep workers protected and ensure compliance.

Contact:

Gary Phillips
Texso Instruments
(760) 444-0032
http://www.texsoinstruments.com

In North Carolina, a local electric company sent a request for a replacement of a high voltage distribution switch for an underground system with another switch that included a disconnect on the load side.   The existing switch had only been in service for one year, but a new switch was needed, stemming from rapid growth of the area.  The new switch would allow the isolation of circuits on the load side independently of each other.

Shortly before 9:00am on a crisp spring morning, two electricians showed up to make the switch.  When they arrived, no one from the electric company was present.  They discussed whether or not the distribution switch was de-energized.  They opened the door of one of the cabinets, and one of the men started guiding a tic tracer.  He allowed it to make contact with a 23,000 volt source, sending 13,200 volts through the ground and into his body.  Paramedics arrived quickly on the scene, but he was pronounced dead at 10:20am.  The other worker received minor flash burns of the eyes and face and stated that he was “electrified,” shaken, and proceeded to run.

When the investigation of the incident was performed, it was determined the man who did not survive was not wearing the required personal protective equipment.  The system was not de-energized or properly grounded.  Written company work procedures require both of these factors.  To add to the tragedy, both workers were present at a safety demonstration that discussed the exact job being performed only two days prior to this incident.  Laws can be written and procedures outlined, but it is up to every individual to follow the rules and guidelines.  Personal protective equipment is designed to prevent accidents like this from happening.  It will do no good if it is not worn when needed.

What is the distance from which I can detect voltage using a hot stick tester?

The distance of detecting voltage will depend on how high the voltage is, and how much of an area is exposed and not covered by shields.  The higher the voltage is, the larger the distance will be for detection.  A car in contact with 120 VAC is detected from about 8 feet, but a “hot” 7500 V overhead distribution line can be picked up from 200 feet away.

What batteries does the AC Hot Stick Tester run on?

Hot stick testers run on four AA batteries, and will last for about 300 hours of continuous use.  A good rule of thumb is to switch the batteries every year.

Does the unit require recalibration?

The unit does not require recalibration, for it runs a three second self-test.  The battery voltage is also monitored continuously.  When and if the batteries run down, a continuous tone is heard.

How do I know when AC is present?

The hot stick tester will start to beep and an LED will blink when AC is present.

How do I locate the source of the AC?

When locating the source of AC, the hot stick tester will beep faster as the front part of the AC Hot Stick is moved closer to the source. The sensitivity can be changed between high and low to narrow in.  In a third setting called “Front Focused” the unit is made directional and picks up primarily from the front.

Can I detect live wires in the ground, in metal conduits or inside walls?

Live wires in the ground or in metal conduits cannot be detected.  The hot stick tester will give a warning however if the current is running in the soil or a metal conduit becomes ungrounded.  Plastic enclosed wires which run in dry walls can usually be traced.

How sturdy is the unit? Is it fireman proof?

Hot stick testers are not fireman proof, but they are “firemen resistant” and can easily take dust, shocks, vibration, splash water, and high and low temperatures.

Can I overload the unit electrically?

The unit can not be overloaded for it is protected against damage from high voltage nearby.

Does the AC Hot Stick Tester indicate DC e.g. from a car battery or the third rail of a subway?

The hot stick tester will not detect DC voltages.  At times, electrostatic charges from rubbing on clothing or even leaves on trees can produce irregular beeps.  These beeps will stop when the hot stick tester is held still.