Megger mit230 user manual pdf
GSafety Warnings and Precautions These must be read and understood before the instrumentis used. They must be observed during
use.■ The circuit under test must be switched off, de-energisedand isolated before test connections are made when carryingout
insulation and continuity tests.■ Circuit connections and exposed metalwork of an installationor equipment under test must not be
touched.
Short test leads together, wait for a stable reading and pressthe test button on the instrument. The display should read0.00 Ω and
display the [z] symbol.Lead null value is automatically stored until reset. To remove, press the TEST button again with leads open
circuit.Continuity Measurement [Ω]1. Set range switch to [Ω].2. Connect the red and black test leads to the circuit to betested. The
instrument will automatically display continuityresistance when connected (up to 99.9 Ω).NOTE: If ">100.0 Ω " is displayed the
resistance of the circuit isover-range.Continuity Buzzer [ ]1.
This instrument is designed for use atCategory III (Building installation/distribution board level) up to600 V (maximum) rms to earth
and 600 V (maximum) rmsbetween terminals. It may also be used at Category IV (Primarysupply level) on 300 V rms phase to earth
systems.Display layoutOperationAll circuits must be isolated before an insulation or continuity test.Automatic Voltage detectionThe
instrument will automatically display voltage between 25 Vand 600 Vac or dc when connected to the circuit under test.Remove the
source of any voltage before continuing to test.Test lead check1. Before each use of the instrument, inspect the test leads,prods and
crocodile clips to confirm that their condition isgood, with no damaged or broken insulation.2. Check continuity of the test leads by
firmly shorting theleads together and read the test lead resistancemeasurement directly from the display.Backlight operation1. Turn
the instrument backlight on by selecting the position. Backlight stays on for 1 minute.2. When the backlight is activated, select the
desired testposition.3. Change range or press [TEST] to re-initialise backlight foranother minute.Test lead null To remove test lead
resistance before continuity tests:1.
Switch the instrument to [Ω]2. Short test leads together, wait for a stable reading and pressthe test button on the instrument. The
display should read0.00 Ω and display the [z] symbol.Lead null value is automatically stored until reset. To remove, press the TEST
button again with leads open circuit.Continuity Measurement [Ω]1.
Set range switch to [Ω].2. Connect the red and black test leads to the circuit to betested. The instrument will automatically display