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Typical representation of REED ST-3347 True RMS Clamp On Meter (discontinued) Product picture of ST-3347 REED True RMS Clamp On Meter (discontinued) for illustration purposes only. Actual product may vary.
REED ST-3347

True RMS Clamp On Meter (discontinued)


A digital clamp on meter that can check AC or DC current up to 1000A, voltage up to 600V, resistance, capacitance, frequency and temperature regardless of waveforms.Reed ST-3347 comes with “PEAK” Hold function that allows the user to record the maximum and minimum readings on the display for the voltage and current ranges.

Accredited calibration/NIST traceable calibration certificate for REED ST-3347 True RMS Clamp On Meter (discontinued) might be available on request (for an extra charge). Please contact us for more info.

REED True RMS Clamp On Meter (discontinued): instrument description

Please note: this is a discontinued model, information shown here is for reference only. The REED ST-3347 has been replaced by REED True RMS AC/DC Clamp Meter with type K thermocouple probe, model R5040.

This hand held ST-3347 AC/DC True RMS Clamp Meter manufactured by Reed measures DC Amperes (0.01A to 1000A), AC Amperes (0.01A to 1000A), DC Voltage (0.1mV to 600V), AC Voltage (0.1mV to 600V), Resistance (0.1Ω to 40MΩ), Capacitance (0.001 nF to 40mF), Frequency (0.001 kHz to 4kHz) and Temperature: (-40°C to 1000°C). Reed ST-3347 offers top class measurement with great accuracy and has been designed and complies With IEC 61010-1 and EN 61010-1 Safety Requirements for Electronic Measuring Apparatus.

REED ST-3347 Features

  • Function Switch;
  • Peak Hold Function
  • Data Hold
  • Peak Hold Button for Volts and Current
  • DC Amps Zero Adjustment
  • Backlight Button
  • Volt, Resistance, Frequency,Capacitance, Temperature Terminal
  • Auto Power Off

REED ST-3347 Specifications

  • Clamp Size 30mm Opening Approx
  • Diode Test Test Current of 0.3mA typical;
  • Open circuit voltage 1.5V DC
  • Continuity Check Thershold<35Ω; Test current <1mA
  • Low Battery indication is displayed
  • Overrange Indication “OL” is displayed
  • Measurements Rate 2 per second, nominal
  • Input Impedance 10MΩ (VDC and VAC)
  • Display 4000 count LCD
  • AC Current 50/60Hz (AAC)
  • AC Voltage Bandwidth 50/60Hz (VAC)
  • Operating Temperature -10°C to 50°C (14°F to 122°F)
  • Storage Tempertaure -30°C to 60°C (-22°F to 140°F)
  • Relative Humidity Up to 85%
  • Over Voltage Category III 600V
  • Battery One DC 9V IEC 6F22. 1604. Battery
  • Auto Power Off Approx 20 minutes
  • Dimensions 229 x 80 x 49mm
  • Weight 303g

How to use REED True RMS Clamp On Meter (ST-3347)

DC Current Measurement with REED ST-335
Using the Function switch, choose the desired range from 1000A or 400A or 40A range position. The REED ST-3347 automatically defaults to DC Current. Before you clamp around the single conductor under test be shure the Range is zero by pressing the DC ZERO button once. Now you have to read the display.

AC True RMS Current Measurement
Set the function switch to 1000A~ or 400A~ or 40A~ range position and make sure that the current under test does not exceed the upper limit of the measuring range you have selected. Press the MODE button to select the AC Current range. The meter automatically defaults to DC current. Press the trigger to open up the transformer jaws and clamp around the single conductor under test. Read the display.

DC Voltage Measurement with REED ST-3347 Clamp on meter
One of the greatest feature of ST-3347 is, after you have set the function switch to the range position, the meter will automatically defaults to DC Volts. Look for the “V Ω TEMP HZ” input terminal and insert the red test lead and the black lead to the “COM” terminal. Now your instrument is connected and you can read measurements on the display.

AC True RMS Voltage Measurement
Start measurements with selecting the AC Volt range. Connect the leads to the circuit under test and take the reading on the display. Please note that the meter is set to default to “Auto Range” mode.

The other functions such as Resistance Capacitance, Frequency or Temperature Measurements may be easily carried out as the other described above.

Ordering info

As a canadian distributor of REED Instruments products we stock most of these Clamp On Meters for same day shipping. To enquire on the REED ST-3347 True RMS Clamp On Meter (discontinued) availability and current list price please contact us.

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