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Фрагмент инструкции
The decision as to the necessity of a protective conductor test in this case is to be taken by a qualified electrician who should also assume responsibility. You can omit the protective conductor test by pressing the key as soon as the following instruction is shown: „Please connect the probe with the protective conductor of the DUT“. Protective Conductor and Insulation Resistance Measurements for Permanently Installed Devices Under Test ! Attention! Deactivate the electrical system which supplies power to the device under test before connecting the test instrument! . Remove the mains fuses from the device under test and disconnect the neutral conductor N inside the device under test. Measuring Contact Current (absence of voltage) Make sure that the contacted parts are not grounded. GOSSEN METRAWATT GMBH Configuring Device Parameters MENU General device parameters can be configured and saved using Setup with the selector switch in the MENU position. Select Setup/Menu and acknowledge. Select parameter and acknowledge, change setting and acknowledge. Settings x / – … = function activated / deactivated Limit values ... Illumination Background illumination for the LCD. One of three different conditions can be selected with the up and down scroll keys: x: continuously on, –: off Numbers 1 through 9: duration in minutes after which illumination is automatically deactivated. Test time Duration of a single test (0 … 255 s) Reference voltage: Voltage to which leakage current makes reference (as a rule nominal line voltage) Earth fault During the short-circuit test, testing is also performed to determine whether or not a connection exists between L/N and PE (short-circuit to exposed conductive part). We assume that a short-circuit to an exposed conductive part exists in the event of leakage current greater than 15 mA from L/N to PE. This value should be increased for some DUTs (in particular high-current consumers), because greater leakage currents are present. Mains wait Line voltage is initially applied to the test socket. However, testing does not begin until after the number of seconds selected in “Mains wait” has elapsed, e.g. in order to suppress measured values during the warm-up phase. Modem... Modem function available upon request Test Sequence ... Settings x / – … = function activated / deactivated Single-fault If the single-fault condition has been activated, the test is interrupted as a failure as soon as an error occurs. Auto Class PSI Test results (passed or failed ) for the various selector switch positions are automatically assigned to the 8 statistics channels. inc. Service Error Measurement results are compensated by taking service error into consideration (measuring error). IT Network Testing in IT systems can be performed by suppressing tests for UPE-N. The UPE-N test determines whether or not voltage is present at PE. (Leakage current measurement results may otherwise be distorted.) Acst Sig, Seq An acoustic signal is generated for: incorrect connection of the DUT, error in the electrical supply system and the next test step. Acst Sig, Meas An acoustic signal is generated for: measured value fluctuations and test current polarity reversal. Auto Point This function can be enabled with the help of an upgrade program, e.g. Z745K (see chapter 13 on page 38). An acoustic signal indicates whether or not the probe is connected to the protective conductor. The test sequence is run automatically. Rapid signal frequency: probe connected Slow signal frequency: next measuring point Direct Printing See chapter 15 on page 39. Reports ... Reports which have been saved to memory can be selected from a list with an ID number and displayed (see chapter 14.2 on page 39). Service ... – Time and date settings (if a printer module is used, the same time and date must also be entered to the PSI- menu) – Service functions (password required) GOSSEN METRAWATT GMBH Individual Measurements MENU 9.1 Measuring Protective Conductor Resistance Definition Protective conductor resistance is the sum of the following resistances: • Connector cable or device connector cable resistance • Contact resistance at plug and terminal connections • Extension cable resistance if utilized . Resistance is measured: • Between each exposed conductive part of the housing and the earthing contacts at the mains and the device plug (if a removable mains connector cable is used), or the protective conductor terminal for permanently installed devices. • As a 4-pole measurement • Between the earthing contacts at the mains plug and the earthing contacts at the device plug for device connector cables • Between the earthing contacts at the mains plug and the earthing contacts at the coupling socket for extension cables Connecting Safety Class I Devices to the Test Socket When the DUT is connected, resistance is measured between the protective conductor terminal at the test socket or at the PE jack, and the probe connection at the DUT (contact with conduct...
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