Operating Instructions METRALINE ZCHECK Loop Resistance Measuring Instrument 3-349-697-03 1/7.
Table of Contents Page 1 Introduction ...................................................................... 2 1.1 1.2 1.3 1.4 1.5 Scope of Delivery ...........................................................................2 Optional accessories ......................................................................2 Safety Precautions .........................................................................2 General Device Description .............................................................
! • • • 1.4 Use original accessories only. Max. permissible voltage between test probe and ground is 300 V! Maximum permissible voltage between the test probes is 300 V! General Device Description The test instrument is enclosed in a compact housing with a patented means of retaining the test probes. The high-contrast, four-color OLED display assures excellent legibility.
The information which appears at the display varies depending on the selected function. 2.3 • Initial Start-Up After inserting the batteries in accordance with section 6.1 on page 9, the measuring instrument is ready for operation. 3 Performing Measurements 3.1 Switching the Instrument On and Off, Energy-Saving Mode, Automatic Shutdown The instrument is switched on by pressing and holding the START key.
3.3 Measurement of Fault Loop Impedance and Line Impedance 3.3.1 Measurement in Circuits without RCD – ~ Function The “~” function is suitable for measuring fault loop impedance in electrical circuits without RCCBs, as well as line impedance. ➭ After switching the instrument on, connect it between L and PE in order to measure fault loop impedance, and between L and N to measure line impedance. 3.3.
Testing With Tripping of the RCCB ➭ Connect the test probe from N to PE (see example in figure 3.12). ➭ Start the measurement by pressing the START key. Assure good contact between the test probes and the device under test while measurement is being performed! After the measurement has been completed, the results are displayed as follows: current calculated from impedance is greater than the minimum short-circuit current required for triggering the selected protective device.
4 Technical Data 4.1 Individual Device Functions 4.2 Reference Conditions Fault Loop Impedance / Line Impedance Nominal Range per EN 61557-3: 0.27 to 200 Range Resolution Intrinsic Uncertainty Measuring Uncertainty 0.00 to 4.99 0.01 (3% rdg. + 5 D) (4% rdg. + 7 D) 5.0 to 49.9 0.1 (3% rdg. + 3 D) (4% rdg. + 4 D) 50 to 200 1 3% rdg. 4% rdg.
5 Table of Protective Devices Stored to the Instrument Fuse Type C Nominal Current (A) Fuse Type NV Nominal Current (A) 0.1 02 0.4 5 Min. Short-Circuit Current (A) Disconnecting Time [s] 35m 0.1 02 0.4 05 5 5 5 5 2.7 1 10 10 10 10 5.4 1.6 16 16 16 16 8.6 9.1 2 20 20 20 20 10.8 5 Min. Short-Circuit Current (A) 32.5 22.3 4 65.6 46.4 38.8 31.9 18.7 4 40 40 40 40 21.6 6 102.8 70 56.5 46.4 26.7 6 60 60 60 60 32.4 10 165.8 115.3 96.5 80.7 46.
6 Maintenance 6.1 Device Power Supply Caution: Dangerous Voltage! Dangerous voltage in battery compartment! Disconnect the test probes from the device under test and switch the instrument off before removing the battery compartment lid. The instrument may not be placed into service if the battery compartment lid has not been inserted and secured with the screws.
Recalibration of your instrument at regular intervals is essential for the fulfillment of requirements according to quality management systems per DIN EN ISO 9001. 7 Repair and Replacement Parts Service Calibration Center and Rental Instrument Service If required please contact: GMC-I Service GmbH Service Center Thomas-Mann-Str. 20 90471 Nürnberg, Germany Phone: +49 911 817718-0 Fax: +49 911 817718-253 E-mail service@gossenmetrawatt.com www.gmci-service.com This address is only valid in Germany.
