If a voltage greater than 2 V a.c. or d.c. is present at the terminals the
measured voltage is indicated on the display. If the fuse is blown the
voltmeter will still operate - see note 1.
For normal voltage measurement:
1. Set the range switch to [V]
2. Connect the test leads to the circuit under test.
3. The display will show the voltage across the test leads.
Note:
measured voltage should not exceed 600 V phase to earth.
NOTE 1.
When fuse is blown:
MIT300 - MIT330 voltmeter will operate normally when connected to
more than 5 volts.
MIT310A will show approximately 40% of true voltage.
ANALOGUE INSTRUMENT MIT310A
Additional notes:
Battery Level
= Exhausted battery
Battery test
Battery condition can be checked by rotating the range knob to the
battery symbol and pressing TEST button. The position of the needle over
the taper symbol will indicate battery condition. Highest charge to the
right.
Note:
NiMH or NiCAD rechargeable batteries show a lower charge than
alkaline batteries, and my not give much warning before becoming
exhausted.
Warning:
Always perform a battery test prior to using the instrument to
ensure the instrument will function properly.
LED Indicators:
Two led indicators show testing status information for test lock and
voltage detection
Voltage warning:
If a voltage greater than 50 V exists on the circuit under test and the
TEST button is pressed, the RED ‘V’ LED will light and testing will be
automatically inhibited.
Test lead Null (MIT310A only)
Before using the continuity range for the first time, the test lead resistance
should be ‘zeroed out’. This ensures any measurement does not include
the resistance of the test leads.
To null the test leads:
1. Connect the test leads to the instrument and firmly short both leads
together.
14
AC / DC VOLTAGE MEASUREMENT
