Extech Instruments EX350 User Manual page 11

DC 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. Move the Function Switch to the
3. Press the M button to select AC or DC
4. Read the Warning and Caution statements at the beginning of this section to determine
whether or not to use the test lead probe covers.
5. Touch the test probe tips to the circuit under test. Be sure to observe the correct polarity
(red lead to positive, black lead to negative).
6. The meter defaults to the Auto Range mode (Auto displayed on LCD). Press the R button
to access the manual range mode. Press the R button to step through the ranges. Press
and Hold the R button to return to the Auto Range mode (Auto will be displayed).
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. If the polarity is
reversed, the display will show (‐) minus before the value.
8. The meter is capable of measuring DC voltages to 600V.
or
Fig 4‐2 DC VOLTAGE MEASUREMENTS
11
position.
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