Ac Voltage Measurements - Extech Instruments MA260 User Manual

Voltage Measurements
WARNING: Do not apply > 1000VAC/DC between the meter's terminals and earth ground
CAUTION: When connecting the test leads to the circuit or device under test, connect the
black lead before the red; when removing the test leads, remove the red before the black lead.
AC Voltage Measurements
WARNINGS:

The time delay that results from the meter's automatic sensing circuit (1 to 2 seconds) may cause GFCI
circuits to reset and breakers to trip.

It is not recommended to use calibration equipment to test the MA260. Calibrators can be damaged if
used to test the MA260.
1. Insert the black test lead banana plug into the negative (COM)
jack and the red test lead banana plug into the positive (V/Ω)
jack.
2. Touch the test probe tips to the circuit under test.
3. Note that because of the Auto‐Sense function the meter starts
in the continuity (resistance) mode and, after several seconds,
enters the Voltage mode. This time delay may preclude the
meter's use on some applications, please use caution.
4. Read the voltage in the display. The display will indicate the
proper decimal point and value.
5. Note that the voltage detect LED may light when ACV voltage is
measured. The meter is capable of measuring voltage from
1.3VAC to 1000VAC. Signals below 1VAC will trigger the meter's
alert beeper.
Input Impedance
The input impedance is greater than or equal to 6K ohms for input voltages up to 30V.
The input impedance increases with input voltage to approximately 420K ohms at 1000VAC.
For AC Voltage, the Auto‐sense feature evaluates input signals and adjusts the Input
Impedance to eliminate effects of ghost voltages.
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