A Leading South African Test and Measurement Instruments Supplier

“For Good Measure”^®

Please contact us by phone, email or visit us at the details given above. We look forward to hearing from you.

Product List

T.M.I.

Test and Measurement Instruments C.C.

CK 1985/007464/23

“Tomorrow’s Instruments Today” — “For Good Measure” ^®

TMI, Established—1982

English, Afrikaans, Portuguese Speaking. Master/Visa Credit Cards

AC Leakage Clamp Meters

AC Leakage Meters

Part No: DL-6054

AC Leakage Current Clamp Meter. ACA leakage, High Precision, Miniature type. Data hold. 20mA/ 20A/200ACA

Part No: DL-9954

AC Leakage Current Clamp Meter. ACA leakage, Auto range, 4000 count & multifunctions. ACA, ACV, current DCV,Ohms,Diode, Continuity beeper. 2 leakage ranges.

Lutron

Call for Pricing

Notes on AC Clamp Meters.

AC Leakage clamp meters are capable of reading extremely low currents which could be leakage current to earth or another return route.

Clamp meters are ammeters that can measure current without the need to disconnect the wires where the measurement occurs. They provide information about current draw and current continuity in order to help users troubleshoot erratic loads and trends. Clamp meters have both positive and negative leads and feature extremely low internal resistance. They are connected in series with a circuit so that current flow passes through the meter. High current flow may indicate a short circuit, an unintentional ground, or a defective component. Low current flow may indicate high resistance or poor current flow within the circuit.

There are two basic types of clamp meters: digital and analog. Both are designed to measure levels of alternating current (AC) and direct current (DC). Some clamp meters that measure AC current also measure root mean square (RMS) power, which is the square root of the time average of the square of the instantaneous power. Most products include a current sensor built into the clamp around the wire. Different types of clamp meters can measure different ranges of AC current, DC current, and AC current frequency. Some clamp meters are handheld and portable. Others are designed for benchtop or shop floor use. Battery-powered clamp meters can be operated without plug-in power and may be rated for outdoor use.

Clamp meters may provide special measurement types or optional features. Some clamp meters can test diodes or transistors. Others can monitor thermocouples or resistance temperature detector (RTD) values. Programmable clamp meters provide internal data storage and allow users to establish activation triggers. They can also interface with computer hardware and software. In addition, products with external storage devices such as disc drives are available. With regard to optional features, clamp meters may adjust sampling rates automatically, display status information as a bar graph, and measure decibel (dB) readings. Mirrored scales make it easier to read clamp meters to a given accuracy by enabling operators to avoid parallax errors.

Notes on Current Leakage.

AC Current leakage testers measure the amount of current that flows through a ground conductor. They include a measuring device or probe that connects to a conductive point, a voltmeter that displays root mean square (RMS) values, and a circuit with specific resistance and frequency characteristics. Current leakage testers are used during both normal and single-fault conditions in order to determine whether electrical devices pose a shock hazard. For medical devices and other specialized equipment, additional single-fault conditions may be required. Organizations such as the International Engineering Consortium (IEC) establish and maintain standards for acceptable levels of current leakage from different classes of devices.

Manual, automatic, and semi-automatic current leakage testers are available. Manual devices require operators to set and change test parameters. Automatic devices are programmable, fully automated, and can often perform an entire series of electrical safety tests in succession. Semi-automatic current leakage testers combine features from both manual and automatic devices. Some current leakage testers include a general-purpose interface bus (GPIB) and are designed to connect to computers, peripherals, and laboratory instruments. Other devices include an RS232 serial bus or a parallel port that is designed to connect to a printer.

Current leakage testers differ in terms of current leakage range, resistance range, communications, and special features. Analog devices display current levels on a dial, usually with a moving pointer or needle. Digital devices display information numerically, typically with a light emitting diode (LED) readout or liquid crystal display (LCD). In terms of special features, some current leakage testers include remote controls, built-in calibration, and warning indicator lights. Other devices allow users to select an output frequency, usually 50 or 60 Hz, and include audible buzzers that sound when test conditions fail. To protect testers from high voltage or current, current leakage testers may include a rapid cutoff. Front panel lockouts prevent tampering with instruments during testing.