Operation (Oscilloscope); Ac And Dc Voltage - Extech Instruments 381285 User Manual

Operation (Oscilloscope)

AC and DC VOLTAGE

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MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE
WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY
WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the
live parts inside some 240V outlets for appliances (contacts can be recessed deep in the
outlets). As a result, the reading may show 0 volts when the outlet actually is live. Make
sure the probe tips are contacting the metal contacts inside the outlet before assuming
that no voltage is present.
CAUTION: Do not measure AC or DC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur during the ON or OFF operations
that can damage the meter.
CAUTION: To avoid meter damage, do not apply 700V AC or 1000V DC for more than
10 seconds.
1. Insert the black test lead banana plug into the negative COM jack and the red test
lead banana plug into the positive V jack.
2. Set the function switch to the V position.
3. Select AC or DC voltage using the
4. Press and momentarily hold the SCOPE key to switch to the graphical display.
5. Touch the test probe tips to the circuit under test and observe the waveform.
Peak-peak voltage
Trigger slope
Trigger level
Position
Horizontal (time) scale
WARNING
GREATER THAN 250VAC OR 360VDC
AC/DC key (default is AC).
V:
@
@
10
Frequency
Cursor width
Waveform
Vertical (volt) scale
V2.1 03/06