RAPITEST DM25 User manual

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DIGITAL
MULTIMETER
OPERATOR'S
MANUAL

COTTTETUTS
1. Safety lnformation
1 .1 Preliminary
1.2 During Use
1.3 Symbols
1.4 Maintenance
2. Description
3. Operating lnstruction
3.1 Measuring Voltage
3.2 Measuring Current
3.3 Measuring Resistance
3.4 Testing Diode
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9
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3.5 Testing Transistor
3.6 Continuity Test
4. Specifications
5. Accessories
5.1 Supplied with the meter
5.2 How to use the holster
6. Battery & Fuse Replacement
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1. SAFETY IIUFORUATIOTI
This multimeter has been designed according to tEC-1010 concerning electronic measuring
instruments with an overvoltage category {CAT ll} and pollution 2.
Follow all safety and operating instructions to ensure that the meter is used safely and is kept
in good operating condition.
1.1 PRELIMII{ARY
r When using the meter, the user must observe all normal safety rules concerning:
- Protection against the dangers of electrical current.
- Protection of the meter against misuse.
o Full compliance with safety standards can be guaranteed only if used with test leads
supplied. lf necessary, they must be replaced with the same model or same electric ratings.
Measuring leads must be in good condition.
-1-

1.2 DURING USE
. Never exceed the protection limit values indicated in specifications for each range of
measurement.
o when the meter is linked to a measurement circuit, do not touch unused terminals'
o when the value scale to be measured is unknown beforehand, set the range selector at the
highest Position-
o Before rotating the range selector to change functions, disconnect test leads from the circuit
under test'
oWhencarryingoutmeasurementsonTVorswitchingpowercircuits,alwaysrememberthat
there may-0" nign amplitude voltages pulses at test points which can damage the meter'
o Never perform resistance measutements on live circuits'
o Always be careful when working with voltages above 6OV dc or 3OV ac rms' Keep fingers
behind the probe barriers while measuring'
- 2-

1.3 SYMBOLS
2\tmportant safety information. refer to the operating manual.
.A Dang"rors voltage may be present.
{ rartn ground.
El Doubte insulation (Protection class ll).
. Before attempling to insert transistors for testing, always be sure that leads have been disconnected
from any measurement circuits.
. Components should not be connected to the hFE socket when make in voltage measurements with test leads.
CAT ll: maximum voltage between terminals and earth is 1000V when used on local level, i.e. appliances, portable
equipment, etc
CAT lll: maximum voltage between terminals and earth is 60OV when used on distribution level, i.e, fixed
installations etc -3

1.4 TIIIAINTENANCE
o Before opening the meter, always disconnect test leads from all sources of electric current'
. For continue protection against fire, replace fuse only with the specified voltage and current
ratingsr
F1 F 2AI25OY F2: F 1OA/250V
r lf any faults or abnormalities are observed, the meter can not be used any more and it has
to be checked out.
o Never use the meter unless the back cover is in place and fastened fully'
o To clean the meter, use a damp cloth and mild detergent only, do not use abrasives or
solvents on it.

2. DESCRIPTIOII
This meter is a portable professional measuring instrument with 3% digit LCD' capable of
performing functions:
- DC voltage measurement. 5 ranges from 2OOrnV to 1000V
- AC voltage measurement, 5 ranges from 2OOmV to 70OV
- DC current measurement, 7 ranges trom 2OpA to 1OA
- Ac current measurement, 6 ranges from 200pA to 10A
- Resistance measurement, 7 ranges from 2OOo to 200MO
- Diode test
- Transistor test
- Audible continuity test
-5-

1. Power Switch
2. LCD Display
3. Transistor Testing Socket
4. Rotary Switch
5. V/O lnput Jack
6. COM lnput Jack
7. A lnput Jack
8. 10A Input Jack

2.1 FUNCTION ATTID RAilGE SELECTOR
There are 8 functions and 32 ranges provided. A rotary switch is used to select functions as
well as ranges.
2.2 POWER SWITCH
A push-push switch is used to turn the meter on or off .
To extend the battery life, Auto Power-Off function is provided{Optional). The meter will be
turned off automatically within around 4O minutes. To turn on the meter again, push the power
switch to release it and then push it once more.
2.3INPUT JACKS
This meter has four input iacks that are protected against overload to the limits. During use'
connect the black test lead to the COM jack and the red test lead as shown below: