Name: MK-720 Corona Discharge Checker
Brand: Checkline
SKU: 993

MK-720 Corona Discharge Checker

See More Corona Discharge Detector

MK-720 Corona Discharge Checker

The Checkline MK-720 is hand-held, battery-powered device designed to detect Electrical Arcing & Corona Discharge conditions - without contact! Corona Discharge occurs when there is a problem with disconnectors, circuit breakers, insulators, etc leading to losses and potentially dangerous conditions. The Checkline MK-720 uses a proprietary algorithm to isolate the ultrasonic sound waves associated with Corona Discharge, separating it from the background noise performed, measured while the line is powered (hot). This algorithm significantly reduces the likelihood of false positive detection common with typical Ultrasonic Leak Detectors.

A large backlit LCD faces the user provide visual and audible indicators. A earphone is provided as part of the standard delivery helping the user to hear the audible tone alerting to the presence of Corona Discharge.

It features an over-sized ultrasonic receiver providing excellent range along with a focus with measurement in ±8° spot. It also features a laser pointer helping the user to visibly identify the target at all times.

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Features
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Detects insulation deterioration on insulators, switches and circuit breakers!
Records measurement data (Component rate, Waveform, FFT data)
Precise measurement in ±8° spot
Easily transferable recorded data to PC via USB cable
Integrated Laser Pointer Identifies area of corona discharge
Generates audible sound from corona discharge and transmits through an earphone

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Specifications
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Detecting frequency	Central frequency 40kHz
Detecting directionality	±8°
Sensitivity	MK-720 recognize discharge of 100pC to 300pC at 1 meter distance, as 20dB
Functions	Display of discharge component rate Display converted value in acoustic pressure Alarm based on discharge component rate Measuring point indication with laser pointer (Laser pointer light intensity Class 2 JIS C6802, Class 2 IEC 6825-1)
Data memory	Discharge component rate and converted value in acoustic pressure Max. 500 data
Output	Buzzer by setting max level Signal output via 3.5mm mini jack USB port for memory data output (USB mini B socket)
Power supply	4x AA alkaline battery (over 8 hours continuous use)
Dimensions	W 174 X H 268 X D 98 mm
Weight	Approx.400g (excluding batteries)
Temp Limits	32-104 °F / 0-40 °C, 10-85%RH (non condensing)
Standard configuration	MK-720, 4x AA batteries, USB cable, Software (Win XP & 7) (CD) (MK-9804), Earphone, Strap, Instruction manual, Inspection sheet
Options	Carrying case (MK-9703), Soft case (MK-9702), Reference oscillator (MP-161)

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Measuring Principle
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Broadband ultrasound is emitted with corona discharge due to insulation deterioration at AC powered facilities. Since the intensity of the emitted ultrasound varies periodically with alternative voltage, double frequency components of power-supply appears prominently in frequency analysis after envelope detection of the received ultrasonic wave.