Megger MTB7671, Руководство пользователя

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4. TESTING A CONTINUITY TESTER
Connect the tester to the continuity and insulation connection sock-
ets in the orange and red section of the test box.
Warning: Do not apply more than 250 mA.
4.1 Current Test
Set the continuity and insulation test select switch to [I TEST] and
perform a continuity test. If the test instrument delivers more than
200 mA the [I TEST] pass LED will light.
✍ - Record the reading on the record card.
4.2
Voltage Test
Set the continuity and insulation test select switch to [V TEST] and
perform a continuity test.
If the open circuit voltage from the tester is between 4 V and 24 V dc
the [V TEST] pass LED will light.
NOTE : The MFT1700 will require the buzzer to be turned on during
this test.
✍ - Record the reading on the record card.
NOTE
: If in either of the tests listed above the LEDs fail to light, the
test instrument under test should be returned for a full calibration.
4.3 0.5
Ω
Test
Set the continuity and insulation test select switch to [0.5
Ω
] and
perform a continuity check. This connects a resistor between the test
sockets of 0.5
Ω
+/-3%. The tester should indicate a measured value
of 0.5
Ω
(+/- operational errors including the tester’s accuracy).
✍ - Record the reading on the record card.
4.4 5.0
Ω
Test
Set the continuity and insulation test select switch to [5
Ω
] and
perform a continuity check. This connects a resistor between the test
sockets of 5
Ω
+/-3%. The tester should indicate a measured value of
5
Ω
(+/- operational errors including the test instrument’s accuracy).
✍ - Record the reading on the record card.
4.5
If an instrument fails the above tests, refer to note 5.6 for reverse
polarity instruments.