Gossen MetraWatt METRACLIP EARTH Operating Instructions Manual
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Gossen MetraWatt METRACLIP EARTH Operating Instructions Manual

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EARTH CLAMP
METRACLIP EARTH
E N G L I S H
Operating Instructions

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Summary of Contents for Gossen MetraWatt METRACLIP EARTH

  • Page 1 EARTH CLAMP METRACLIP EARTH E N G L I S H Operating Instructions...

  • Page 2: Definition Of Measurement Categories

    Thank you for purchasing a METRACLIP EARTH earth clamp. For best results from your instrument: ■ read these operating instructions carefully, ■ comply with the precautions for use. Symbol Meaning WARNING, risk of DANGER! The operator must refer to these instructions whenever this danger symbol appears.
  • Page 3 PRECAUTIONS FOR USE This instrument and its accessories comply with safety standards EN 61010-1, EN 61010-030, and EN 61010-2-032 for voltages of 600V in category IV at an altitude of less than 2000 m, indoors, with a degree of pollution of not more than Failure to observe the safety instructions may result in electric shock, fire, explosion, and destruction of the instrument and of the installations.
  • Page 4 CONTENTS Page ..........................1 DEFINITION OF MEASUREMENT CATEGORIES: ..........2 CONTENTS ......................4 1. GETTING STARTED ..................7 1.1 Scope of supply .................... 7 1.2 INSERTING THE BATTERIES ..............7 1.3 Setting the date and time ................7 1.4 EXAMPLE OF DISPLAY ................8 2.
  • Page 5 5.1.2 PARAMETERIZING THE MEASUREMENT ........23 5.1.3 MEASUREMENT ................23 5.1.4 MEASUREMENT RESULT ............... 24 5.1.5 STORAGE OF THE MEASUREMENTS ........... 24 5.1.6 PRESENCE OF ALARMS ..............24 5.2 USE IN ADVANCED MODE ............... 24 5.2.1 OBJECT .................... 24 5.2.2 SELECTION ..................
  • Page 6 9.4 PROLONGED STOP .................. 42 10. TECHNICAL CHARACTERISTICS ..............43 10.1 REFERENCE CONDITIONS ..............43 10.2 ELECTRICAL CHARACTERISTICS ............43 10.2.1 LOOP RESISTANCE MEASUREMENT ........... 43 10.2.2 LOOP INDUCTANCE MEASUREMENT ........... 44 10.2.3 ESTIMATE OF THE CONTACT VOLTAGE ........44 10.2.4 CURRENT MEASUREMENT ............

  • Page 7: Getting Started

    1. GETTING STARTED SCOPE OF SUPPLY Rep. Designation Carrying case. METRACLIP EARTH earth clamp. Set of 4 AA batteries (1.5 V). CD containing the operating instructions. Verification certificate. Safety data sheet (20 languages) Quick Start guide Fig. 1 INSERTING THE BATTERIES Refer to §11.2.

  • Page 8: Example Of Display

    EXAMPLE OF DISPLAY figure opposite shows display, upon first use, with the device set to Ω+A. The measured current 30.0 mA impedance is 7.9 Ω. The buzzer is active and the memory is empty. Note: This display corresponds to Standard mode.

  • Page 9: Functions Of The Device

    ■ Clamping diameter 35 mm. ■ Storage of measurements ( and/or A, with time-stamping). METRACLIP EARTH: up to 2000 measurements stored. ■ Possibility of reading out the stored measurements on the clamp itself. METRACLIP EARTH: Read-out also possible via Bluetooth®...

  • Page 10: Front Panel

    FRONT PANEL Measurement head Trigger Guard Rotary switch used to select a measurement Display backlight key function, SET-UP, or memory read MEM key, to store HOLD key, to freeze measurements the display ► key, for validation and OLED display unit browsing in the measurement screens Fig.
  • Page 11 Rep. Designation See § Measurement head. Guard. The user's hand must be below this zone and not touch the measurement head (item 1). Function switch. OFF: device off. Ω+A: simultaneous selection of the Loop impedance measurement and the Leakage current measurement. A: selection of the Current measurement.

  • Page 12: Device–Rear Panel

    Rep. Designation See § ► Function that depends on the setting of the function switch, as follows: When the device is set to Ω+A (Advanced Mode) 5.2.5 Short press: switches the display through the following 3 modes, in order: ■ Display of the impedance recalculated at the selected frequency.

  • Page 13: Display Unit

    DISPLAY UNIT Fig. 6 Rep. Designation See § ■ Display of the buzzer active state; the icon is masked when the buzzer is inactive. ■ Selection of the buzzer operating mode via SET-UP menu 2. Indicator of freezing of the measurement display when the HOLD key is pressed or in the Pre-Hold mode Indicates that the main display shows the date (with the function switch set to MR or SET-UP).
  • Page 14 Alarm threshold undershoot indicator. Signal indicating potentially hazardous voltage. Blinks when the contact voltage exceeds 50V. METRACLIP EARTH: Remains displayed while the Bluetooth connection is being established. Blinks for the duration of the communication. Memory index display unit. 4-digit digital display (0 to 9999 counts ■...

  • Page 15: Audible Signals

    AUDIBLE SIGNALS The device can generate audible signals of four types: Type Duration Meaning sound Low-pitched Short Normal use (key pressed). Permanent Over(under-)shoot of a measurement alarm threshold (Ω, A). High-pitched Short Abnormal use (for example, memory full). Permanent Overshoot of a safety alarm threshold (V). The audible signal can be activated or deactivated in SET-UP (see chapter 8, menu 2).

  • Page 16: Measurement Principle

    3. MEASUREMENT PRINCIPLE The schematic diagram below illustrates the general case of measurement of the resistance of a loop comprising: ■ The earth electrode Rx; ■ The earth; ■ Several earth electrodes of resistance R ■ A guard wire looping all of these earths, introducing an inductive component. The clamp combines two functions in the measurement head: ■...

  • Page 17: Inserting The Batteries

    4. USE INSERTING THE BATTERIES Refer to §11.2. COMMISSIONING THE DEVICE With the clamp closed and not clamping any conductor, set the function switch to a position other than OFF. All icons of the display unit light for approximately 2 seconds, before possible entry of the date and time (see next section).

  • Page 18: Standard Or Advanced Mode

    STANDARD OR ADVANCED MODE The earth clamp can be used in two ways. ■ The Standard mode makes the standard loop ohmmeter clamp measurements. ■ The Advanced mode is used to refine and complete the measurements: Impedance referred to the selected frequency. Contact voltage.

  • Page 19: Use Of Pre-Hold

    4.8.4 MEMORY FULL The communicating model METRACLIP EARTH has a larger recording capacity, 2000 measurements. If the circular recording mode is activated, as soon as the threshold of 2000 values is exceeded, the sequence number is displayed alternately with FULL in order to report the overwriting of the oldest records.

  • Page 20: Reading The Stored Data

    FULL. The next time the MEM key is pressed, a disablement beep is emitted and the FULL indication blinks. 4.8.5 READING THE STORED DATA The data can be looked up using the MR function. See chapter 7. MANAGEMENT OF THE ALARMS The device has 3 distinct alarms that can be parameterized.

  • Page 21: Current Alarm

    4.9.3 CURRENT ALARM If the current exceeds the threshold set, the alarm symbol and the alarm threshold are displayed and blink. If the buzzer is active, a low-pitched audible signal is emitted. Fig. 10 4.9.4 IMPEDANCE ALARM If there is no voltage alarm, no detection of NOISE, and no current alarm, an alarm on the impedance may be triggered.
  • Page 22 4.9.4.2 High threshold configuration An audible signal is emitted at values exceeding the threshold (detection of an earthing impedance that is too high). Fig. 12 If the impedance crosses the selected threshold, a low-pitched audible signal is emitted. 4.9.4.3 Priority of the alarms If several alarms are triggered simultaneously, a priority rule determines the display and the corresponding sound: ■...

  • Page 23: Ω+A Position

    5. Ω+A POSITION Since the measurement frequency is audible, the operator hears a discontinuous audible signal (beep-beep). This is neither an operating fault nor an alarm, and it cannot be eliminated. This audible signal is amplified by the presence of current in the loop. USE IN STANDARD MODE The selection of the Standard mode is described in §8.5, menu 9.

  • Page 24: Measurement Result

    5.1.4 MEASUREMENT RESULT Once the measurement has stabilized, the display unit indicates: ■ The leakage current. ■ The impedance of the loop at the frequency of 2083 Hz. The impedance is measured only if the leakage current is less than 10A. In the 10 A–40 A range, only the current is displayed;...

  • Page 25: Measurement

    5.2.4 MEASUREMENT ■ Place the conducting wire of the circuit to be measured in the clamp and close the clamp. If the clamp is incorrectly closed, the icon is displayed. ■ If necessary, use the HOLD key to freeze the measurement. See §4.6. ■...

  • Page 26: Complementary Information

    Fig. 16 ■ When the inductive component is negligible (*) with respect to the resistive component, the symbol R=Z is displayed, and only the impedance displayed; inductance is replaced by dashes. (*) R > 25 Ω or R[Ω] / L[H] > 10 Fig.

  • Page 27: Impedance Greater Than 1500Ω

    IMPEDANCE GREATER THAN 1500Ω 5.3.2 In this case: ■ The impedance display indicates O.R (Over range). Fig. 19 5.3.3 PERTURBING LEAKAGE CURRENT If the current is greater than 5 A, or if it is significantly deformed: ■ The blinking Noise symbol displayed.

  • Page 28: Storage Of The Measurements

    If the current is greater than 40 A, the current display indicates O.R (Over Range). Fig. 22 5.3.5 STORAGE OF THE MEASUREMENTS Refer to § 4.8.2. 5.3.6 PRESENCE OF ALARMS Refer to §4.9.

  • Page 29: Position A

    6. POSITION A OBJECT In this mode, the clamp measures the electric current, independently of any earth measurement. PARAMETERIZING THE MEASUREMENT If necessary, first adjust the current alarm threshold in accordance with §8.5, menu 6. MEASUREMENT ■ Place the conducting wire of the circuit in which the current is to be measured, in the clamp and close the clamp.

  • Page 30: Management Of The Alarms

    MANAGEMENT OF THE ALARMS preset alarm threshold exceeded, reminder threshold and the value of the current measured blink Refer to §4.9. Fig. 24...

  • Page 31: Memory Read (Mr)

    7. MEMORY READ (MR) OBJECT The MR position (Memory Read, display of stored data) is used to display measurements previously stored by pressing the MEM key. SELECTION OF THE MEMORY READ MODE Set the function switch to MR. The choice of mode (Standard or Advanced) was made by parameterizing;...

  • Page 32: Data Displayed In Advanced Mode

    Press ► display measurement storage date-time screen. To exit from the memory read mode, set the rotary switch to the desired mode. Fig. 27 7.3.2 DATA DISPLAYED IN ADVANCED MODE icon indicates use of the Advanced mode; the user then disposes of 4 distinct screens.

  • Page 33: Use Of The Keys

    In the METRACLIP EARTH model, with circular recording activated, the sequence number of the oldest record is not necessarily 1: the remaining records may be numbered from 44 to 2043, for example.

  • Page 34: Exiting From The Read Mode

    7.3.5 EXITING FROM THE READ MODE Set the function switch to the desired measurement position (OFF, Ω+A, A or SET-UP).

  • Page 35: Set-Up

    8. SET-UP OBJECT The SET-UP position gives access to the following menus: Function Erasure of the memory. Activation/Deactivation of the buzzer. Activation/Deactivation of automatic switching off. Setting of the impedance alarm threshold (Ω). Setting of the voltage alarm threshold (V). Setting of the current alarm threshold (I).

  • Page 36: Selecting A Specific Menu

    SELECTING A SPECIFIC MENU Use the keys as follows. Action ▲ Move up in the menu tree. ▼ Move down in the menu tree. ► Select the menu displayed or return to the previous menu. When changes have been made in one of the SET-UP menus (other than deletion), the changes can be cancelled by turning the function switch to a position other than SET-UP, provided that there has not been a return to the main menu (press on ►).
  • Page 37 Menu no. Indication Object and use AL. Ω Setting the impedance alarm threshold (Ω) Enter the menu by ►. AL. Ω blinks. ■ Setting the sense of the alarm Press ▲ or ▼ to select the state of the alarm: ■...
  • Page 38 Menu no. Indication Object and use AL. A Setting the current alarm threshold (I) Enter the menu by ►. AL. A blinks. ■ Activation/Deactivation of the alarm Press ▲ or ▼ to select the state of the alarm (Fig. ■ 6, item 13): : deactivated.
  • Page 39 Menu no. Indication Object and use Selecting the Standard or Advanced operating mode Enter the menu by ►. USE blinks. ■ Press ▲ or ▼ to select the Standard or Advanced ■ mode. - Advanced mode: the icon is displayed. - Standard mode: Std is displayed.
  • Page 40 Menu no. Indication Object and use Activating the adjustment menus This function gives access to the following 3 sub- functions: ■ CAL R: adjustment of the impedance measurement. See menu 13. ■ CAL I: adjustment of the current measurement. See menu 14.
  • Page 41 CAL. Current measurement adjustment procedure Additional equipment necessary ■ A source of stabilized 0.1 and 10 A current. Adjustment of the current measurement ■ Press ► for 3 seconds to validate CAL. I function The sensitivity of the channels used in the current measurement will be recalculated on 2 current values.

  • Page 42: Off Position

    9. OFF POSITION The device can be switched off manually or automatically. MANUAL SWITCHING OFF Set the function switch to OFF. AUTOMATIC SWITCHING OFF The automatic switching off function acts after 5 minutes of inactivity, meaning no key pressed, no change of switch setting, and no opening of the clamp. Fifteen seconds before this stop, a short audible signal is emitted and the display unit blinks once a second.

  • Page 43: Technical Characteristics

    10. TECHNICAL CHARACTERISTICS 10.1 REFERENCE CONDITIONS Quantities of influence Reference conditions Ambient temperature 23±3 °C. Relative humidity 50%RH±10%. Battery voltage 6 V±0.2 V. Magnetic field < 40 A/m DC. No AC field. Electric field < 1 V/m. Operating position Clamp horizontal. Position of the conductor in the clamp Centred.

  • Page 44: Loop Inductance Measurement

    Measurement frequency: 2083 Hz. Transposition frequency: choice of 50, 60, 128, or 2083 Hz for the impedance calculation. Maximum overloads: - permanent current 100 A maximum (50/60 Hz). - transient current (< 5 s) 200 A (50/60 Hz). 10.2.2 LOOP INDUCTANCE MEASUREMENT Measurement ranges (µH) Resolution (µH) Intrinsic uncertainty...

  • Page 45: Variations In The Domain Of Use

    10.3 VARIATIONS IN THE DOMAIN OF USE The influence is characterized by an Accuracy class number for each quantity of influence. Influence Quantity of Limit of the Quantities Typical influence Domain influenced A, Ω Temperature -20 °C to +55° C , Uc 1 ct/10°C 2 ct/10°C...

  • Page 46: Environmental Conditions

    10.5 ENVIRONMENTAL CONDITIONS Fig. 33 1. Domain of reference (CEI160). 2. Domain of operation. 3. Domain of storage (without batteries). According to CEI359 category II (equipment for indoor and outdoor use). 10.6 MECHANICAL CHARACTERISTICS Dimensions: 55x95x262 mm (thickness, width, height). Max.

  • Page 47: Servicing And Maintenance

    11. SERVICING AND MAINTENANCE Except for the batteries, the instrument contains no parts likely to be replaced by personnel who are not specially trained and accredited. Any unauthorized repair or replacement of a part by an “equivalent” may gravely impair safety. 11.1 CLEANING Disconnect everything connected to the device and set the switch to OFF.

  • Page 48: Preservation Of Stored Data

    11.2.2 PRESERVATION OF STORED DATA When the batteries are removed, the data (recorded measurement values, alarm thresholds) are preserved. The date and time must be reset if the batteries are out for more than 2 minutes. 11.3 CHECK OF ACCURACY 11.3.1 OBJECT AND EQUIPMENT NECESSARY Regular checking serves to verify the accuracy of the clamp and thereby detect...

  • Page 49: Procedure

    11.4.3 PROCEDURE Refer to §8.5, menu no. 13, 14, 15. 11.5 METROLOGICAL CHECK, REPAIR AND REPLACEMENT PARTS SERVICE, CALIBRATION CENTER Like all measuring or testing devices, regular instrument verification is necessary. If required, please contact: GMC-I Service GmbH Service-Center Thomas-Mann-Strasse 20 90471 Nürnberg •...

  • Page 50: Warranty

    12. WARRANTY Except as otherwise stated, our warranty is valid for twelve months starting from the date on which the equipment was sold. Extract from our General Conditions of Sale, provided on request. The warranty does not apply in the following cases: ■...

  • Page 51: To Order

    13. TO ORDER EARTH CLAMP METRACLIP EARTH .......... M312N Supplied in a carrying case with: - 4 LR6 or AA alkaline batteries - a test report - a CD ROM containing the user manuals (one per language) - a multilingual quick start guide...
  • Page 52 06 - 2015 Code 694302B02 - Ed. 3 Subject to change without notice • A pdf version is available on the Internet Phone+49 911 8602-111 GMC-I Messtechnik GmbH Fax +49 911 8602-777 Südwestpark 15 E-Mail info@gossenmetrawatt.com ● 90449 Nürnberg Germany www.gossenmetrawatt.com...

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