Quickie Pulse Manuel de service télécharger pdf (Page 6)

PULSE 6 SERVICE MANUAL

PAGE 0.4

SEPT 2011 SUNRISE MEDICAL

This section describes the basic symbols used in a typical

multimeter.

ALTERNATING CURRENT Use this when you want to test something

that has AC current running through it. Typically you’d want to test the

voltage of an inverter (for cold cathodes or neons) or a similar device.

DIRECT CURRENT. This is the type of electrical power produced by a

battery. With a battery connector, the black wire(s) should be connected

to the negative(-) terminal of the battery and should be considered

the common ground. The red wire(s) should be connected to the

positive(+) terminal of the battery and is considered the “hot” lead.

Voltage

This means Voltage or Potential Difference. It will measure the

potential difference between the two probes. To measure voltage,

connect the positive probe to a port that is marked “V” or Voltage.

Note: “mV” means milli-volts = .001 Volt

Current

Since current is measured in Amps and the readout value is in

amps, the symbol "A" is used. On this setting the unit measures

current that is ﬂ owing through the part of the circuit between

the two probes (the meter itself). Typically, you need to plug the

positive terminal into a port marked “A” or Current. You need to put

the meter “In Series” in the circuit to use this feature correctly.

Resistance

This symbol represents Resistance and is measured in Ohms.

You can use this setting to measure the resistance between two

points; for example across a piece of wire or a resistor (to check its

value). If you don’t have a continuity check, then this can be used

to check for shorts. Any value below 0.05 Ohms constitutes a short,

meaning that whatever the probes are attached to is connected

electrically.

Continuity

A commonly used function. By putting a current through the

two terminals (the same as the Ohm-meter function) it can be

determined if the resulting value is within the “contact” range, this

is signiﬁ ed with a beep. The feature found on some multimeters

enables you to check for shorts without taking your eyes off your

work. Other meters signify this with a small ﬂ ashing light.

Symbols

Multimeter Tutorial

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Quickie Pulse Manuel de service Page 6