Textron GREENLEE CMGRT-100A Instruction Manual
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Textron GREENLEE CMGRT-100A Instruction Manual

Clamp-on ground resistance tester
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INSTRUCTION MANUAL
MANUAL DE INSTRUCCIONES
INSTRUCTION MANUAL
MANUEL D'INSTRUCTIONS
SET-UP
MR
A
Ω
+ A
OFF
HOLD
MEM
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 esta herramienta o
darle 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.
www.calcert.com
15
10
20
5
25
0
30
CMGRT-100A
CLAMP-ON GROUND
RESISTANCE TESTER
VERIFICADOR
DERESISTENCIA DE
TIERRA CON PINZA
VERIFICATEUR DE
RESISTANCE DE TERRE A
PINCE
Español: p. 33
Français: p. 65
© 2018 Greenlee Textron
01/18
sales@calcert.com

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Summary of Contents for Textron GREENLEE CMGRT-100A

  • 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. © 2018 Greenlee Textron 01/18 1.800.544.2843 www.calcert.com sales@calcert.com...

  • Page 2: Table Of Contents

    Table of Contents Description ......................3 Safety ........................3 Purpose........................3 Important Safety Information................4–6 Identification ......................7 Symbols on Unit ....................7 Display Icons ......................8 Product Features ....................9–22 Rotary Switch Positions ..................9 Alarm Feature and Set-up ................10 Navigation .....................10 Set-up Menus ..................11–19 Memory ......................22 Auto-Power Off ....................22 Measurement Mode ..................22 Theory of Operation ....................23 Operation ......................24...

  • Page 3: Description

    CMGRT-100A Description The Greenlee CMGRT-100A Clamp-On Ground Resistance Tester is a hand-held testing device intended to evaluate grounding systems. It has two modes: • Standard Mode: Standard Loop Resistance & Leakage Current Measurements • Advanced Mode: Refine Measurements to find Impedance at the Selected Frequency & to compute...

  • Page 4: Important Safety Information

    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 5 CMGRT-100A 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. • Clamp meter, test leads or any other clamp accessory, when used to make a measurement, create a System. The System is rated for CAT IV 600 VAC when using the test leads or accessories provided with the meter.
  • Page 6 Important Safety Information Electric shock hazard: • Unless measuring voltage, current, or frequency, shut off and lock out power. Make sure that all capacitors are discharged. Voltage must not be present. • Set the selector and connect the test leads so that they correspond to the intended measurement. Incorrect settings or connections can result in incorrect measurements or damage to the unit.

  • Page 7: Identification

    CMGRT-100A Identification 1. Jaw 2. Guard 3. Lever 4. Rotary Switch 5. Display Backlight ON/OFF 6. Stores Measurements in Memory 7. Navigate/Validate Measurement Displays 8. HOLD Button 9. OLED Display 10. Calibration Loop (52084190) SET-UP Ω HOLD Symbols on the Unit Warning—Read the instruction manual Warning—Risk of Electric Shock...

  • Page 8: Display Icons

    Display Icons Advance Mode Inductive Component = Resistive Component (Advanced Mode) Main Display. Displays OR (Out of Range) when the measured resistance is over 1500 Ω or/and when the measured current is over 40A Resistance/Impedance (Advanced Mode) Storage Mode Memory Recall Mode Memory Location Hazardous Voltage (Blinks when Voltage exceeds 50V) Alarm Threshold High/Low Indicator...

  • Page 9: Product Features

    CMGRT-100A Product Features Rotary Switch Positions: OFF – Instrument Powered Off Ω + A – Measure Loop Impedance & Leakage Current A – Measure Current MR – Display Stored Data SET-UP – Access to Instrument settings & Data Selection SET-UP Ω...

  • Page 10: Alarm Feature And Set-Up

    Product Features (cont'd) Instrument SET-UP There are twelve accessible menus in the SET-UP position of the rotary switch that allows user defined parameters to configure the instrument. Function Erase stored data. Enables/ disable audible alarm. Enables/disables Auto Power OFF Sets the impedance alarm threshold (Ω) Sets the voltage alarm threshold (V) Sets the current alarm threshold (I) Sets the date.

  • Page 11: Set-Up Menus

    CMGRT-100A Product Features (cont'd) SET-UP Menus 1. CLr – Erase Stored Data • Enter menu by . CLr blinks. • Hold buttons simultaneously for 6 seconds to erase all recorded data. The meter indicates MEM 0. • Return to the previous menu by SET-UP SET-UP SET-UP...
  • Page 12 Product Features (cont'd) 3. stOP – Enable/Disable Auto Power OFF • Enter menu by . stOP blinks. • Press to enable/disable Auto Power OFF. • Auto Power OFF deactivated when icon is displayed. • Return to the previous menu by SET-UP SET-UP HOLD...
  • Page 13 CMGRT-100A Product Features (cont'd) 4. AL. Ω – Impedance Alarm Threshold (cont'd) Setting the Alarm Value: • Press to select the impedance alarm threshold • Validate by SET-UP SET-UP HOLD HOLD SET-UP SET-UP HOLD HOLD 1.800.544.2843 www.calcert.com sales@calcert.com...
  • Page 14 Product Features (cont'd) 5. AL. V – Voltage Alarm Threshold • Enter menu by . AL. V blinks. • Press to select state of the alarm: — Disabled — Enabled for a measurement exceeding the threshold • Validate by Note: Voltage Alarm can only be triggered for measurements exceeding threshold •...
  • Page 15 CMGRT-100A Product Features (cont'd) 6. AL. A – Current Alarm Threshold • Enter menu by . AL. A blinks. • Press to select state of the alarm: — Disabled — Enabled for a measurement exceeding the threshold • Validate by Setting the Alarm Value: •...
  • Page 16 Product Features (cont'd) 7. dAtE – Set Date • Enter menu by . dAtE blinks. • Press to select a year and validate by • Press to select the month and validate by • Press to select the date. • Validate and return to the previous menu by SET-UP SET-UP SET-UP...
  • Page 17 CMGRT-100A Product Features (cont'd) 7. dAtE – Set Date (cont'd) SET-UP SET-UP HOLD HOLD 8. HOUR – Set Time • Enter menu by . HOUR blinks. • Press to select AM/PM or a 24-hour display mode (24H), which blinks. Validate by •...
  • Page 18 Product Features (cont'd) 8. HOUR – Set Time (cont'd) SET-UP SET-UP SET-UP HOLD HOLD HOLD SET-UP SET-UP SET-UP HOLD HOLD HOLD 1.800.544.2843 www.calcert.com sales@calcert.com...
  • Page 19 CMGRT-100A Product Features (cont'd) 9. USE – Select Standard/Advanced Mode • Enter menu by . USE blinks. • Press to select between Standard or Advanced Mode. — Advanced Mode: The + icon is displayed — Standard Mode: Std is displayed •...
  • Page 20 Product Features (cont'd) 10. FrEQ – Select Test Frequency • Enter menu by . FrEQ blinks. • Press to select among the four available transposition frequencies for measured impedance • Validate and return to the previous menu by SET-UP SET-UP SET-UP HOLD HOLD...
  • Page 21 CMGRT-100A Product Features (cont'd) 11. HOLd – Enable/Disable AUTO-HOLD • Enter menu • Use movement buttons to enable or disable AUTO-HOLD. It is enabled when icon is displayed SET-UP SET-UP SET-UP HOLD HOLD HOLD SET-UP SET-UP HOLD HOLD 1.800.544.2843 www.calcert.com sales@calcert.com...

  • Page 22: Memory

    Product Features (cont'd) 12. VER – Display Version Number • Enter menu and the version number is displayed SET-UP SET-UP SET-UP HOLD HOLD HOLD 13. CAL – Reserved for Factory Use Memory: The instrument can store up to 300 measurements. A full memory is represented by FULL. A data can be stored by pressing the button.

  • Page 23: Theory Of Operation

    CMGRT-100A Theory of Operation The CMGRT-100A performs two measurements: resistance and current. It measures resistance by applying a voltage at 2.403 kHz and indirectly measuring the resulting current. It measures current indirectly by measuring the electromagnetic field around a conductor, which is proportional to the current flowing through the conductor.

  • Page 24: Operation

    Operation See Features. Turn the unit on, selecting the appropriate features (turn the speaker on or off, change the alarm setpoint, etc). See Typical Applications for specific measurement instructions. Test the unit on a known functioning circuit or the test resistance loop. To use the test resistance loop, clamp the CMGRT-100A around the loop.

  • Page 25: Typical Applications

    CMGRT-100A Typical Applications General procedures for all applications: Remove any molding from the ground conductor so that the jaws can close completely around the conductor. Center the conductor in the jaw for highest accuracy. Take the reading. Replace the molding. Service Entrance or Meter Multiple Ground Rods Water Pipe Ground...
  • Page 26 Typical Applications (cont'd) Central Office Locations The main ground conductor from a ground window or a ground plane is usually the location to clamp the unit. Due to the wiring practices within the central office, there are many locations at which you can look at the water pipe or counterpoise from within the building.
  • Page 27 CMGRT-100A Typical Applications (cont'd) Telephone Pedestal Phone Pedestal Note: Clamp onto the ground conduc- tor (as shown) or onto the ground rod. Ground Bar Sheath Connection Ground Level Ground Rod Phone Pedestal Remove ground bar connection to Ground Bar pedestal rod. Sheath Connection Extend pedestal rod lead to the ground bar using a temporary...

  • Page 28: Frequently Asked Questions

    Frequently Asked Questions Does the ground electrode have to be disconnected and isolated as is required when using the “Fall- Of-Potential” test with auxiliary electrodes? No. Actually the electrode must be connected to the system to provide the path for test signal injection as well as to provide the background impedance necessary as the reference.

  • Page 29: Accuracy

    CMGRT-100A Ground Resistance Range Resolution Accuracy 0.010 to 0.10 Ω 0.001 Ω ± (1.5% + 0.01 Ω) 0.10 to 1.00 Ω 0.01 Ω ± (1.5% + 0.02 Ω) 1.0 to 50.0 Ω 0.1 Ω ± (1.5% + 0.1 Ω) 50.0 to 100.0 Ω 0.5 Ω...

  • Page 30: Specifications

    Battery: 4 x 1.5V LR6 (AA) alkaline or 4 NiMH batteries Statement of Conformity Greenlee Textron Inc. is certified in accordance with ISO 9001 (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 31: Maintenance

    CMGRT-100A Maintenance • 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. See Specifications. Failure to observe these precautions can result in injury and can damage the unit. Battery Replacement Before opening the case, remove the jaw from the circuit and shut off the unit.

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