User manual MEGGER MFT1553

[. . . ] M MFT1500/2, MFT1552 and MFT1553 Series Multifunction Tester USER MANUAL GSAFETY s s s WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used. The circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests. Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance test, or RCD test. Circuit connections and exposed metalwork of an installation or equipment under test must not be touched. [. . . ] Any tests that exceed these limits are disabled. 0 or 180° testing 0° or 180° is selected by pressing the BLUE button on the side of the MFT on either the I or 5I RCD test. The I, and 5I RCD tests should be performed at 0° and 180° and the greater trip time recorded. AUTO RCD TEST SEQUENCE (MFT1552 AND MFT1553 ONLY) The AUTO test function will run the 1/2I, I, and 5I plus 0º and 180º tests automatically, and store the test results, while the operator stands by the RCD to reset it when it trips. Connect the RED test lead to the "Live" terminal of the RCD and GREEN and BLACK test leads to the earth conductor. Alternatively connect the mains plug test lead to a supply outlet. Example shows a 13. 9 ms trip time at 5I on 180º. RAMP TEST The RCD trip current is measured by applying a test current of half the rated trip current and increasing this every 200 ms. When the RCD trips, the current flowing is recorded and displayed in mA. To determine the trip current of an RCD. Select the appropriate RCD rated current on the right hand rotary switch. Select the RAMP test on the left hand range knob. 5. Press the YELLOW TEST button The trip current is displayed. If the RCD fails to trip, ">***mA" will be displayed, where *** indicates the last test current applied. for two seconds. Method of measurement The two wire lead or plug should be used for this measurement. A constant current source is connected across the supply and the time taken for the supply to trip is measured by the instrument in ms. Possible sources of error Measurement results can be affected by the following: s DC SENSITIVE RCD TESTING D. C. sensitive RCDs are tested with a pulsed waveform. The RMS current is 2 x the rated operating current of the RCD. As with the normal RCDs, these should be tested with 0° and 180° polarity. Select the appropriate RCD rated current on the right hand rotary switch. Select the [1/2I, I, or 5I] test on the left hand range knob Use the BLUE button to cycle through the test options, selecting DC and the required polarity. Press the YELLOW TEST button The trip time will be displayed in ms. [. . . ] There are three common "Bluetooth Stacks" employed by third party dongles. This will not normally be stated on the dongle packaging but each will install slightly differently. A brief summary of the common types will follow but follow any instructions supplied with the product. Some machines have Bluetooth communications built in but not enabled by default. [. . . ]