Voltage warning (MIT310A only)
If a voltage exists on the circuit under test the voltmeter will indicate this.
However voltages under 50 V will be displayed but may be difficult to read
from the analogue display.
Default voltmeter (MIT310, MIT320 and MIT330)
The default voltmeter automatically operates if a voltage is present across
the test probes of greater than 25 V.
In V
olts range the meter operates at greater than 2 V.
If the voltage exceeds 50 V any further testing is inhibited for safety.
The voltage will be displayed.
Backlight operation (MIT320 and MIT330 only)
Both the display and test ranges are backlit. The backlight function can be
selected at any time while the instr
ument is switched on by pressing the
BA
CKLIGHT J button.
The backlight function will switch off automatically 20 seconds after the
instrument has finished testing.
Display warning symbols
GRefer to user manual
Any time the warning triangle is displayed the operator should refer to
the user manual for further information.
LRange lock
Displayed at any time the [TEST] button is locked in the on position.
zLead nulled
Indicates that the test lead resistance has been removed from the test
result.
Battery condition indication. Refer to page 18.
f Fuse blown indicator, appears when an instrument fuse has failed.
Refer to page 19.
Test lead connection
The Red/Black test lead set should be connected to the appropriate
sockets on the rear of the instr
ument marked + and – respectively.
Test probes and crocodile clips are supplied for connection to the circuit
under test.
Fused test leads are available as an optional accessory, please refer to
accessories list at the end of this document.
Application
This instrument may be connected live to ear
th or between live
conductors of systems that have a rated voltage of 600 V a.c. r
ms to earth
and an installation (overvoltage) Category III or lower, or CATIV
applications with a rated voltage of 300 V or less.
This means that the instrument may be connected to any fixed wiring of a
building installation, but not to primary supply circuits such as overhead
cables. To maintain user safety and ensure accurate measurements, only
use the test leads supplied by Megger Limited.
9
MIT300_UG_en_V11.qxp 14/1/09 3:03 pm Page 9
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