Clamp Meter DT266 Digital Clamp Multimeter ACDC Multimeter Ohmmeter With Temperature Measurement

• The digital clamp meter comprises features Common Function: 3 1/2 digits LCD,
  Max. reading 1999;
  Data-Hold Function;
  Low battery indication;
  Plug-in insulation tester adapter 500VDC; DCA+ACV+ACA+OHM;
  ACCESSORIES: Test lead;9V Battery(AA) Inside ; Users Manual;
  DC Voltage 1000V ±(0.5%+1dgt)
  AC Voltage 200-750V ±(1.2%+4dgt)
  AC Current 200A-1000A ±(2.5%+5dgt)
  Resistance 200Ω-20KΩ ±(1.0%+2dgt)
  Continuity Buzzer Yes Data Hold Yes Power Supply 9V Battery 6F22
  Maximum Display 1999 Display Size 14×47mm Product Net Weight 350g
• A multimeter with built-in clamp.
• A clamp meter measures the vector sum of the currents flowing in all the conductors passing through the probe, which depends on the phase relationship of the currents.
• A relatively recent development is a multi-conductor clamp meter with several sensor coils around the jaws of the clamp. This could be clamped around standard two- or three-conductor single-phase cables to provide a readout of the current flowing through the load,[3] with no need to separate the conductors.
• The meter reading divided by the number of turns is the current,[4] with some loss of accuracy due to inductive effects.
• Clamp meters are used by electricians, sometimes with the clamp incorporated into a general purpose multimeter.
• It is simple to measure very high currents (hundreds of amperes) with the appropriate current transformer. Accurate measurement of low currents (a few milliamperes) with a current transformer clamp is more difficult.
• Columbia iron vane type clamp-on ammeter, with heads for different ranges
• Less-expensive clamp meters use a rectifier circuit which actually reads mean current, but is calibrated to display the RMS current corresponding to the measured mean, giving a correct RMS reading only if the current is a sine wave. For other waveforms readings will be incorrect; when these simpler meters are used with non-sinusoidal loads such as the ballasts used with fluorescent lamps or high-intensity discharge lamps or most modern computer and electronic equipment, readings can be quite inaccurate. Meters which respond to true RMS rather than mean current are described as “true RMS”.
• Typical hand-held Hall effect units can read currents as low as 200 mA, and units that can read down to 1 mA are available.
• Several jaw sizes are available for clamping around large conductors and bus bars up to 4 1⁄2 inches (110 mm) wide.[4] As the illustration shows, the scale is very non-linear and unsuitable for measuring low currents, with currents of less than half the full-scale deflection crammed into a short section of the dial

DT266 Digital multimeter