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Extech MA140 Clamp Meter Digital 300A AC True RMS MA140
Clamp Meters

Extech MA140 Clamp Meter Digital 300A AC True RMS MA140

The Extech MA140 clamp meter is a small and practical clamp meter for RMS current measurements up to 300 A AC. It is an economical yet reliable choice with the highest possible accuracy for an...

The Extech MA140 clamp meter is a small and practical clamp meter for RMS current measurements up to 300 A AC. It is an economical yet reliable choice with the highest possible accuracy for an instrument in its category. Its small size makes it ideal for accessing difficult points.

Key Features:

  • TRUE-RMS measurements.
  • 22mm jaw opening.
  • Measurement sensitivity...
See Description & Specifications See Description & Specifications
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Product report

Description & Specifications

The Extech MA140 clamp meter is a small and practical clamp meter for RMS current measurements up to 300 A AC. It is an economical yet reliable choice with the highest possible accuracy for an instrument in its category. Its small size makes it ideal for accessing difficult points.

Key Features:

  • TRUE-RMS measurements.
  • 22mm jaw opening.
  • Measurement sensitivity adjustment using Auto Sense technology.
  • Low-pass filter (LPF).
  • Inductive current detector.
  • Inrush current measurement.
  • Backlit 6000-digit display.
  • Audio signal when a measurement exceeds the first measurement by 50 digits.
  • Low battery indication and Auto power off.

Included in the package:

  • Carrying case
  • Two LR44 batteries

Manufacturer

Manufacturer Details

Warnings & Safety Information

Dimensions

Maximum Jaw Opening
-

Maximum Jaw Opening

The maximum cable or conductor diameter that the clamp can grip in order to perform a measurement.
with Test Leads
No
AC Current
300 A
Indication
Digital
Bluetooth
No
Safety Category
-
ISO/NIST Calibration Certificate
-

Features & Functions

Inrush Current
-

Inrush Current

Ability to record the instantaneous inrush current (duration ~100ms) absorbed by electric motors, motor-driven devices, and compressors during their momentary startup.
True RMS
Yes

True RMS


The True-RMS method will provide the correct value of the alternating quantity regardless of its waveform.
NCV
No
LoZ (Low Impedance / Low Impedance)
-

LoZ (Low Impedance / Low Impedance)

Low impedance function that absorbs induced/parasitic voltages ("phantom" voltages or ghost voltages) from adjacent cables, ensuring that you measure only the actual line voltage.
VFD Mode / LPF (Low Pass Filter)
-

VFD Mode / LPF (Low Pass Filter)

Integrated low-pass filter that cuts off high-frequency harmonic noise (PWM) produced by variable speed drives, allowing accurate voltage and frequency measurement in Inverters.
Temperature Measurement
-

Temperature Measurement

Ability to measure temperature via a connected thermocouple (Type-K terminal), allowing temperature monitoring of pipes, refrigerants, and HVAC components.
Capacitor Capacitance Measurement
-

Capacitor Capacitance Measurement

Ability to test and measure capacitor capacitance, allowing the immediate diagnosis of worn starting capacitors in motors, pumps, and compressors.

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.