Textron Greenlee CM-450 Instruction Manual
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Textron Greenlee CM-450 Instruction Manual

Digital clamp-on meter
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1.800.544.2843
INSTRUCTION MANUAL
MANUAL DE INSTRUCCIONES
MANUEL D'INSTRUCTIONS
CM-450
Digital
Clamp-on
Meter
Medidor digital
con pinza
Contrôleur
numérique
à pince
Read and understand all of the instructions and
safety information in this manual before operating or
servicing this tool.
Lea y entienda todas las instrucciones y la
información sobre seguridad que aparecen en este
manual, antes de manejar estas herramientas o darles
mantenimiento.
Lire attentivement et bien comprendre toutes les
instructions et les informations sur la sécurité de ce
manuel avant d'utiliser ou de procéder à l'entretien de
cet outil.
52033586 REV 1
© 2008 Greenlee Textron Inc.
www.calcert.com
15
10
20
5
25
0
30
CM-450
TRUE RMS
3/08
sales@calcert.com

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Summary of Contents for Textron Greenlee CM-450

  • Page 1 Lire attentivement et bien comprendre toutes les instructions et les informations sur la sécurité de ce manuel avant d’utiliser ou de procéder à l’entretien de cet outil. 52033586 REV 1 © 2008 Greenlee Textron Inc. 3/08 1.800.544.2843 www.calcert.com sales@calcert.com...

  • Page 2: Purpose Of This Manual

    All specifications are nominal and may change as design improvements occur. Greenlee Textron Inc. shall not be liable for damages resulting from misapplication or misuse of its products. ® Registered: The color green for electrical test instruments is a registered trademark of Greenlee Textron Inc.

  • Page 3: Important Safety Information

    CM-450 Important Safety Information SAFETY ALERT SYMBOL This symbol is used to call your attention to hazards or unsafe practices which could result in an injury or property damage. The signal word, defined below, indicates the severity of the hazard. The message after the signal word provides information for preventing or avoiding the hazard.
  • Page 4 Important Safety Information Electric shock and fire hazard: • Do not expose this unit to rain or moisture. • Do not use the unit if it is wet or damaged. • Use test leads or accessories that are appropriate for the application. Refer to the category and voltage rating of the test lead or accessory.

  • Page 5: Statement Of Conformity

    Failure to observe this precaution may result in injury and can damage the unit. Statement of Conformity Greenlee Textron Inc. is certified in accordance with ISO 9000 (2000) for our Quality Management Systems. The instrument enclosed has been checked and/or calibrated using equipment that is traceable to the National Institute for Standards and Technology (NIST).

  • Page 6: Display Icons

    Identification 1. Jaw 2. Position error marks 3. Jaw center marks 4. Lever 5. Hold button 6. Relative measurement button 7. Display 8. Select button 9. Frequency button 10. Selector switch 11. Negative, common (COM), or ground input terminal 12. Volts or resistance (VΩ) input terminal Display Icons Auto ranging is enabled.
  • Page 7 CM-450 Using the Features Selector Switch • Slide switch to desired mode of operation: AC voltage DC voltage AC current ohms/continuity/diode • Return switch to OFF position when not in use. Select Button (SELECT) • Momentarily press to select resistance, continuity, or diode test when the Selector switch is set to Frequency Button (Hz) •...
  • Page 8 The ability to read true RMS provides much more measurement versatility. The Greenlee CM-450 is a true RMS meter. The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.

  • Page 9: Operation

    CM-450 Operation Electric shock hazard: Contact with live circuits could result in severe injury or death. 1. Set the Selector switch according to the Settings Table. Momentarily press the SELECT button to select mode. 2. Refer to “Typical Measurements” for specific measurement instructions. 3.

  • Page 10: Typical Measurements

    Typical Measurements AC Amps Clamp Around Wire Notes: • Clamp the jaw around one conductor only. • Close the jaw completely to ensure accurate measurement. • Center the wire in the jaw for highest accuracy. Clamp Around Line Splitter Notes: •...
  • Page 11 CM-450 Typical Measurements Voltage Resistance 1.800.544.2843 www.calcert.com sales@calcert.com...
  • Page 12 Typical Measurements Continuity Diode Test Reverse Bias Forward Bias 1.800.544.2843 www.calcert.com sales@calcert.com...
  • Page 13 CM-450 Accuracy Refer to “Specifications” for operating conditions and temperature coefficient. Accuracy is specified as follows: ± (a percentage of the reading + a fixed amount) at 23 °C ± 5 °C (73.4 °F ± 9 °F), 0% to 75% relative humidity. True RMS readings: Voltage is specified from 5% to 100% of the range, and AC current is specified from 10% to 100% of the range, unless otherwise specified.
  • Page 14 Accuracy (con’t) Resistance Measurement Range Accuracy 400.0 Ω ± (0.8% + 0.8 Ω) 4.000 kΩ ± (0.6% + 0.004 kΩ) 40.00 kΩ ± (0.6% + 0.04 kΩ) 400.0 kΩ ± (0.6% + 0.4 kΩ) 4.000 MΩ ± (1.0% + 0.004 MΩ) 40.00 MΩ...

  • Page 15: Specifications

    CM-450 Specifications Display: 3-3/4-digit LCD (4000 maximum reading) Sampling Rate: 3 per second Overrange Indication: “OL” appears on the display Maximum Conductor Diameter: 26 mm (1.02") Measurement Category: Category III, 600 V Temperature Coefficient: 0.15 x (specified accuracy) per °C below 18 °C or above 28 °C Operating Conditions: At 0% ≤...

  • Page 16: Maintenance

    Maintenance Electric shock hazard: • Do not attempt to repair this unit. It contains no user-serviceable parts. • Do not expose the unit to extremes in temperature or high humidity. Refer to “Specifications.” Failure to observe these precautions may result in injury and can damage the unit.

  • Page 17: Entretien

    CM-450 Entretien Risque de décharge électrique : • Ne pas tenter de réparer cet appareil. Il ne comporte aucune pièce pouvant être réparée. • Ne pas exposer l’appareil à des températures ou à une humidité extrêmes. Se reporter à la section des « Spécifications ». L’inobservation de ces consignes pourrait endommager l’appareil et entraîner des blessures.

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