Operation - Extech Instruments EX845 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/DC 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 A
range
2. Press the trigger to open jaw.
enclose only one conductor. For
optimum results, center the
conductor in the jaw.
3. The clamp meter LCD will display
reading.
DCA ZERO
The DC Zero feature removes offset
improves accuracy for DC current
To perform a zero, select ADC and
conductor in the jaw:
1. Press the DC ZERO button to
display. "ZERO" will appear in the display. The offset value is now stored andremoved from all measure
ments.
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
lead into the positive V terminal.
2. Set the function switch to the V
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.
AC
or V position.
AC DC
7
or A
DC
Fully
the
values and
measurements.
with no
zero the
red test