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CEM DT-337 Operating Instruction
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CEM DT-337 Operating Instruction

Dc/ac clamp meter
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OPERATING INSTRUCTION
DC/AC CLAMP METER

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Summary of Contents for CEM DT-337

  • Page 1 OPERATING INSTRUCTION DC/AC CLAMP METER...

  • Page 2: Safety Notes

    Safety International Safety Symbols This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information. This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present Double insulation SAFETY NOTES Do not exceed the maximum allowable input range of •...

  • Page 3: Input Limits

    CAUTIONS Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. Always remove the test leads before replacing the battery. Inspect the condition of the test leads and the meter itself for any damage before operating the meter.
  • Page 4 Meter Description 1. Current clamp 2. Clamp trigger 3. Safety protection ring 4. ZERO button 5. Data Hold and Backlight button 6. Mode select button 7. Range select button 8. Hz/%duty button 9. Rotary Function swith 10. LCD display 11. COM input jack 12.
  • Page 5 Specifications Function Range & Accuracy (% of reading) Resolution DC Current 4.000 A DC ± (2.8% + 10 digits) 80.0 A DC ± (3% + 8 digits) AC Current ± (3.0% +10digits) 4.000 A AC (50/60Hz) 80.0A AC ± (3.0% + 8 digits) 400.0 mV DC ±...
  • Page 6 500.0Hz Sensitivity: 10Vrms min. @ 20% to 80% duty cycle 5.000kHz 50.00kHz 500.0kHz 5.000MHz 10.00MHz Duty Cycle 0.5 to 99.0% ±(1.2% reading + 2 digits) Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz; Sensitivity: 10Vrms min. Analog output: (for ACA & DCA range), 10mV/Amp (20KHz at ±3dB) Accuracy: ±...
  • Page 7 Clamp size Opening 0.9" (23mm) approx Diode Test Test current of 0.3mA typical; Open circuit voltage 1.5V DC typical. Continuity Check Threshold <150Ω; Test current< 1mA Low Battery Indication “ ” is displayed Overrange Indication “OL” is displayed Measurements Rate 2 per second, nominal Input Impedance 7.8MΩ...
  • Page 8 Operation NOTICES: Read and understand all warning and precaution statements listed in the safety section of this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use. AC/DC Current Measurements WARNING: Ensure that the test leads are disconnected from the...
  • Page 9 DC/AC Voltage Measurements 1. Insert the black test lead into the negative COM terminal and the red test lead into the positive V terminal. 2. Set the function switch to the V position. 3. Select AC or DC with the MODE button. 4.

  • Page 10: Capacitance Measurements

    3. Press the MODE button until “ “ appears in the display. 4. Touch the test probes to the diode under test. Forward voltage will indicate 0.4V to 0.7V. Reverse voltage will indicate “OL”. Shorted devices will indicate near 0mV and an open device will indicate “OL”...
  • Page 11 Analog Signal Output 1. Switch the function selector to DCA or ACA range. 2. Connect red test lead to “VΩ” terminal and black one to the “ COM ” terminal. 3. Connect tip of the test leads to the meter or oscilloscope input terminal.

  • Page 12: Zero Button

    Data Hold To freeze the LCD meter reading, press the data hold button. The data hold button is located on the left side of the meter (top button). While data hold is active, the HOLD display icon appears on the LCD. Press the data hold button again to return to normal operation.
  • Page 13 4. Re-assemble the meter...