The following warnings apply in addition to those listed previously. All persons involved must be trained and competent in isolation and safety procedures for the system to be worked on. They must be clearly instructed not to touch the earth electrode, test stakes, test leads, or their terminations if any 'Live' earths may be encountered. It is recommended that they wear appropriate rubber gloves, rubber soled shoes, and stand on a rubber mat.
The earth electrode under test should be isolated from the circuit it is protecting before testing commences. If this is not possible, ART may be used to measure electrode resistance.
The instrument terminals should be connected to the system under test through isolation switches that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation. The isolation switch must be open whilst any personal contact is made with the remote test stakes, or the connecting leads, e. The instrument terminals should be connected to the system under test through fuses that are rated to handle the likely maximum fault voltages and currents that could be encountered at the installation.
Warning: Whenever battery cells are being fitted or replaced, there should be no connections to the instrument terminals and the instrument should be switched off.
Warning: To avoid damage by leaking electrolyte or deep discharge, do not leave cells fitted in an instrument which will remain unused for extended periods of time. Warning: Incorrect battery cell polarity can cause electrolyte leakage, resulting in damage to the instrument. If the battery condition indicator does not show a full charge when battery cells are new, a cell may be reversed.
Warning: Whenever battery cells are being recharged, there should be no connections to the instrument terminals and the instrument should be switched off. Doing so will result in instrument damage and may cause personal injury.
Warning: Only use the charging equipment provided by Megger for use with this instrument. The Megger DET family of test instruments offers a unique solution to the measurement of earth or ground electrode rod resistance and soil resistivity.
The family has seven variants supporting 2, 3 and 4- wire measurements:. Test leads for 3-wire instruments, lead lengths are: 3m, 10m and 15m; for 4-wire instruments: 3m, 10m, 10m and 15m. Test stakes for 3-wire instruments: 2 stakes are supplied; for 4-wire instruments, 4 stakes are supplied. The Megger DET series instruments are supplied with batteries fitted.
When batteries become exhausted, refer to the section on battery replacement or recharging. Warning: Do not switch the instrument on with the battery cover removed. Notify me when back in stock. Description Included Accessories Designed to measure earth electrode resistance and soil resistivity. Earth Resistance Ranges : 0. Similar Products In Stock! Add to Cart.
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We will notify you as soon as this item is available for purchase. Table of Contents. Previous Page. Next Page. They must be observed during use. Page 4: Illustrations Illustrations Fig. Page 5: General Description This kit current circuit test leads does not affect the result.
Potential circuit test leads can also be ignored because Page Fig. Whatever causes the condition too high for accurate measurement, the Rc LED warning to appear should be cleared before a test can automatically illuminates, accompanied by the warning be regarded as valid. Four Terminal Measurement Once the button has been released, the test will After the test spikes have been set up and connected continue for approximately 30 seconds. It is plug the mains supply lead into a suitable socket outlet beneficial to the battery to keep it fully charged.
Page Measuring Techniques Testing Earth Electrodes Insert the Current test spike into the ground some 30 to 50 metres away from the earth electrode to be tested. Resistance areas associated with an earth electrode and current spike.
Measuring soil resistivity -Typical variations in soil resistivity 25Line traverse 26Calculation of Resistivity 27Continuity Testing You should use asuitable alternative power cord, or if necessary change the plug by cutting the cord and fitting a suitable plug. Note: A plug severed from the power cord should be destroyed, as a plug with bare conductors is hazardous ina live socket outlet.
They may also make earthresistance tests which lead to the measurement of soilresistivity. Operation of the instrument is extremely simple. Twomodes of operation are selected by means of two pushbuttons; one for a three terminal test and one for a fourterminal test. All other functions of the instrument areautomatic. A reversing d. The potentialdeveloped across the earth is compared with the current and, after filtering and phase sensitive.
Test frequency is Hz and in the interests of safetythe maximum test voltage is limited to 50 V peak between C1 and C2 terminals. Short circuit current is amaximum of 10 mA. Test leads are not suppliedwith an instrument but form part of an earth testing fieldaccessory kit which is available as an option.
This kitalso includes test spikes electrodes for makingtemporary earth spikes. Mounted on the front panel are two push-buttonswitches for testing using either 3 or 4 terminalmeasurement. The instruments digit liquid crystaldisplay shows the test result, warns of problems withthe test conditions and also indicates low batteryvoltage.
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