Clamp-on ammeter, also known as a clamp meter, consists primarily of an electromagnetic current meter and a core-piercing current transformer. The core-piercing current transformer has a movable opening in the shape of a clamp, hence the name clamp-on ammeter. It is a portable instrument that can measure the AC current in a circuit without interrupting the circuit, making it very convenient for electrical maintenance and widely applied.
Clamp meters are instruments that integrate current transformers with ammeters, and they are an important branch of digital multimeters. Their operating principles are the same as those of current transformers for measuring current. A clamp meter is composed of a current transformer and an ammeter. When the clamp meter's handle is squeezed, the core of the current transformer can open; the conductor through which the measured current flows can pass through the opening in the core without being cut off. When the handle is released, the core closes. The conductor through which the measured circuit is passed becomes the primary coil of the current transformer, and the current flowing through it induces a current in the secondary coil. This makes the ammeter connected to the secondary coil display an indication—indicating the current in the measured circuit.
Clamp meters were originally used to measure AC current, but now they have the same features as multimeters, capable of measuring AC/DC voltages, currents, capacitance, diodes, transistors, resistances, temperatures, frequencies, and more.
Product model: MT87
Function - Range - Accuracy
DC Voltage: 600V【±1.0%】
AC Voltage: 450V【±1.2%】
Alternating Current: 20-400A【±2.0%】
Resistance: 200KΩ ±1.0%
Special Features
3.5-inch LCD display, maximum reading 1999
Low Battery Indicator Function
Overload protection
Data retention for easier reading
Buzzer Toggle and Diode Test Function
Product Features
Battery: 2 AAA batteries (not included)
Clamp mouth diameter: Φ21.3mm
Body color: Yellow
Body weight: About 200g
Dimensions: 150×60×28mm
Standard accessories: test probe, instruction manual, warranty card.
Standard Packaging: Cross-border Special Supply ( )
