Lo Z' Ac Voltage Measurements - Extech Instruments EX650 User Manual

'Lo Z' AC Voltage Measurements
The normal high input impedance (voltage measurement
for all AC voltage tests. However, if a voltage on a non‐energized line is detected use the Lo Z
setting to determine if the voltage is really there or is it a ghost voltage.
When the function switch is turned to the Lo Z position a low impedance (Z) test circuit is
engaged that eliminates ghost voltages on non‐energized lines. Refer to the Voltage
Measurements section earlier in this guide for Safety information and connection diagrams.
*The Lo Z impedance is approx. 3kΩ.
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. Move the Function Switch to the Lo Z position.
3. Touch the test probe tips to the AC circuit under test. Be sure to observe the correct
polarity (red lead to positive, black lead to negative).
4. Read the digital value and the 60‐segment bargraph representation of the measurement
(EX655) in the display. The display will also indicate the proper decimal point and
measurement type/units symbols.
5. The meter is capable of detecting AC voltages to 600V in Lo Z mode. Note the voltage
alert symbol when voltage is present.
position) would typically be used
15
EX65x‐en‐GB_V1.6 7/16