Extech Instruments EX650 User Manual page 13

AC Voltage Measurements
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. Turn the function switch to the
3. Read the Warning and Caution statements above to determine whether or not to use the
test lead probe covers.
4. Touch the test probe tips to the circuit under test.
5. Read the digital value and the 60‐segment bargraph (EX655 only) on the display. The
meter is Auto Ranging (Auto displayed on LCD) and therefore selects the proper decimal
point position. The meter also displays the measurement type, unit symbols, and other
relevant multifunction icons.
6. Use the M button to view the frequency (Hz) of the measured voltage (EX655 only).
Important note: Wait until the meter is setup and actively measuring the voltage signal
before accessing the Hz measurement mode.
7. Note the voltage alert symbol
8. The meter is capable of detecting AC voltages to 750V.
9. For EX655 only: Press and hold the LPF button to engage the Low Pass Filter circuit (the
LPF icon will display). Press and hold LPF again to exit this mode. See the Low Pass Filter
section for more details.
10. Set the function switch to the LoZ position to engage the low impedance circuit (the
impedance will now be approximately 3kΩ). See the dedicated Lo Z section of this guide.
AC Hz
EX655
Fig 4‐1 AC VOLTAGE MEASUREMENTS
position. Use the M (MODE) button to select AC.
when voltage is present.
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