Loz Ac Voltage Measurements; Variable Frequency Voltage Measurements - Extech Instruments EX350 User Manual

LoZ AC Voltage Measurements
When the function switch is turned to the Lo Z position, the meter applies a low input
impedance circuit to the input terminals to eliminate stray or ghost voltages. Refer to the
Voltage Measurements section earlier in this guide for Safety information and connection
diagrams.
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 circuit under test.
4. The meter defaults to the Auto Range mode (Auto displayed on LCD). Manual range
cannot be used in this mode.
5. Read the digital value of the measurement in the display. The display will also indicate
the proper decimal point and measurement type/units symbols.
Variable Frequency Voltage Measurements
When the function switch is turned to the LPF position the meter can measure voltage on
signals with varying frequency as in Variable Frequency Drives (VFD). Refer to the Voltage
Measurements section earlier in this guide for Safety information and connection diagrams.
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 LPF position.
3. Select AC voltage
4. Press and Hold the LPF button for two seconds. The meter will beep and the LPF icon will
appear on the display.
5. Touch the test probe tips to the circuit under test.
6. The meter defaults to the Auto Range mode. Manual range cannot be used in this mode.
7. Read the digital value of the measurement in the display. The display will also indicate
the proper decimal point and measurement type/units symbols.
17
EX35x‐en‐GB_V1.2 12/15