How To Use A Multimeter; Whats Does A Multimeter Do?; Type Of Multimeters; Appendix B: Using A Multimeter - Nautilus Be Strong Commerical T912 Service Manual

Appendix B
Using a Multimeter

How to Use a Multimeter

This is a basic overview of mutlimeters. For in depth directions, please use the manual provided
with your multimeter.

Whats Does a Multimeter Do?

A multimeter combines the functions of three instruments: ammeter (measures current),
voltmeter (measures voltage), and ohmmeter (measures resistance).
Electronic signals are usually thought of in terms of voltage. For that reason, and because it is an
easier measurement to take, we will use the volts setting. We will not want to use the ammeter
setting to troubleshoot fitness equipment.
The ohmmeter setting is used to determine whether there is an open circuit (a bad connection
or break in the wires) or a short circuit (two wires that normally would not come in contact with
each other have been pinched together or crossed in some way).
Ohmmeters work by passing a small current through the wire or component and measuring the
voltage produced.

Type of Multimeters

Multimeters are available in digital and analog models. Digital meters give an output in numbers
usually on a LCD. Analog meters move a needle along a scale.
We recommend using a digital meter. While analog meters can be very cheap, they are difficult
for beginner to read accurately, especially on resistance scales. Also, the components are
delicate and easily damaged.
Settings
For the beginner the multimeter can be intimidating because of the range of settings available.
The diagrams on page 75 show what settings to use when checking voltage and resistance on
the fitness equipment. Perhaps more importantly, it shows which settings are not needed.
There are two types of digital multimeters commonly available:
• switched range and
• autoranging.
Switched range meters require you to choose the appropriate position from the many choices
available on the dial. For example, if the dial is switched to 20VDC, 20 volts is the maximum
voltage that can be measured. This is important when you want to read small increments in
voltage accurately. For example, if the required voltage is 13.5 volts and the meter is set too high,
you may only see 13 volts on the readout. Setting the meter to a lower maximum will show 13.5
volts.
Autoranging meters automatically adjust the range to give an accurate reading. This type of
meter is more expensive but much easier to use.
SECTION 7: APPENDIXES
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