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Figure 1-41.—A parallax error in a meter reading | Up
Neets Module 03-Introduction to Circuit Protection, Control, and Measurement | Next
HOOK-ON TYPE VOLTAMMETER |
1-46
Figure 1-42.—A parallax error on a meter with a mirrored scale.
MULTIMETER SAFETY PRECAUTIONS
As with other meters, the incorrect use of a multimeter could cause injury or damage. The following
safety precautions are the MINIMUM for using a multimeter.
·
Deenergize and discharge the circuit completely before connecting or disconnecting a
multimeter.
·
Never apply power to the circuit while measuring resistance with a multimeter.
·
Connect the multimeter in series with the circuit for current measurements, and in parallel for
voltage measurements.
·
Be certain the multimeter is switched to ac before attempting to measure ac circuits.
·
Observe proper dc polarity when measuring dc.
·
When you are finished with a multimeter, switch it to the OFF position, if available. If there is
no OFF position, switch the multimeter to the highest ac voltage position.
·
Always start with the highest voltage or current range.
·
Select a final range that allows a reading near the middle of the scale.
·
Adjust the "0 ohms" reading after changing resistance ranges and before making a resistance
measurement.
·
Be certain to read ac measurements on the ac scale of a multimeter.
·
Observe the general safety precautions for electrical and electronic devices.
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