12 13
To find the RMS voltage line-to-line on a 3-phase power line, multiply
the rated line-to-ground voltage by the square root of 3 (approx.
1.732).
For example, if you connect this Meter to a 480 volts 3-phase line
(i.e.480V line-to-ground), the total available voltage line-to-line is about
832V AC (≒480V x 1.732). Severe damage and a dangerous shock
hazard could result because this exceeds the rating of this Meter.
4.2 Measuring Resistance (Ohms, Continuity)
CAUTION!
TURN OFF POWER AND DISCHARGE ALL CAPACITORS ON
CIRCUIT TO BE TESTED BEFORE ATTEMPTING INCIRCUIT
RESISTANCE MEASUREMENTS. FAILURE TO DO SO MAY END
UP IN EQUIPMENT (AND/OR INSTRUMENT) DAMAGE.
THE RESISTANCE MEASURING CIRCUIT APPLIES A KNOWN
VALUE OF CONSTANT CURRENT THROUGH THE UNKNOWN
RESISTANCE AND THEN MEASURES THE VOLTAGE
DEVELOPED ACROSS IT. THEREFORE, REMOVE ALL POWER TO
THE CIRCUIT UNDER TEST WHEN MAKING RESISTANCE
MEASUREMENT. IF ANY VOLTAGE IS
P
RESENT IN THE TEST
CIRCUIT, AN ERRONEOUS READING WILL RESULT. THIS METER
MAY BE DAMAGED IF VOLTAGE IN EXCESS OF 600V AC IS
PRESENT.
NOTE: When measuring critically low Ohm values, touch tips of
test leads together and record the reading. Subtract this
reading from any additional measurement to obtain the
most accurate value.
• When measuring large resistance, reading may be unstable due to
environmentally induced electrical noise. In this case, directly
connect the resistor to input terminals of the meter or shield the
resistor at potential of the COM input terminal to obtain stable
reading.
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