Operation; Ac/Dc Voltage Measurements - Extech Instruments EX850 User Manual

Operation
NOTES: Read and understand all Warning and Caution statements in this operation manual
prior to using this meter. Set the function select switch to the OFF position when the meter is
not in use.
AC Current Measurements
WARNING: Ensure that the test leads are disconnected from the meter before making current
clamp measurements.
1. Set the Function switch to the AAC or
ADC range
2. Press the trigger to open the jaw. Fully
enclose only one conductor. For optimum
results, center the conductor in the jaw.
3. The clamp meter LCD will display the
reading.
DCA ZERO
The DC Zero feature removes offset values and
improves accuracy for DC current
measurements. To perform a zero, select ADC
and with no conductor in the jaw:
1. Press the DC ZERO button to
zero the display. "ZERO" will appear in the display. The offset value is now stored and remo
ved from all measurements.
2. To view the stored value, press the DC ZERO button. "ZERO" will flash
and the stored value will be displayed.
3. To exit this mode, press and Hold the ZERO button until "ZERO" is no
longer in the display.
AC/DC Voltage Measurements
1. Insert the black test lead into the negative COM terminal and the red test
lead into the positive V terminal.
2. Set the function switch to the VAC or VDC position.
3. Use the MODE button to select AC or DC Voltage.
4. Connect the test leads in parallel to the circuit under test.
5. Read the voltage measurement on the LCD display.
Correct
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EXTECH INSTRUMENTS
Incorrect
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