LIMIT 300 User manual

Operating manual
300
Palm Size
Digital Multimeter

1
Illustrations
Fig 1. Voltage measurement
DC and AC
Fig 2.
DC Current Measurement
Fig 3. Diode test
Continuity test
Fig 4. Temperature measurement
Fig 5. Replacing the Battery
Replace the fuse

DC Voltage
Range Resolution Accuracy Overload
Protection
200mV 100μV 250V DC or AC
2000mV 1mV ±(0,5%+2)
20mV 10mV 500V DC or AC
200V 100mV
500V 1V ±(0,8%+2)
AC Voltage
Range Resolution Accuracy Overload
Protection
200V 100mV 500V DC or AC
800V 1V ±(1.2%+10)
DC Current
Range Resolution Accuracy Overload
Protection
200μA 1μA ±(1%+2) 315mA, 250V
20mA 10μA fast type fuse:
200mA 100μA ±(1.2%+2) o 5x20 mm
10A 100mA ±(2%+2) Un-Fused
300
2

3
Tabels
Resistance
Range Resolution Accuracy Overload
Protection
200Ω0.1Ω±(0.8%+5)
2000Ω1Ω250V DC
20kΩ10Ω±(0.8%+2) or AC
200kΩ100Ω
20MΩ10MΩ±(1%+5)
Diodes and Continuity
Range Resolution Remark Overload
Protection
1mV Displays approximate forward
voltage drop: 0.5~0.8V.
250V DC or AC
1ΩBuzzer beeps at ‹70Ω
Temperature
Range Resolution Accuracy Overload
Protection
-40°C~150°C 1°C ±(18%+3)
150°C~1000°C ±(1.5%+15) 250V DC or AC
-40°F~302°F 1°F ±(1%+4)
302°F~1832°F ±(1.5%+15)

300
4
Language page
English . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11
Svenska . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-17
Norsk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-23
Dansk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-30
Suomi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-36
Deutsch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-44
Nederlands . . . . . . . . . . . . . . . . . . . . . . . . . . . .45-51
Français . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52-58
Italiano . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59-65
Español . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66-72
Português . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-79
Polska . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80-86
Eesti . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87-92
Latviski . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93-100
Lietuvi Š kai . . . . . . . . . . . . . . . . . . . . . . . . 101-108
PyÔÔÍËÌ . . . . . . . . . . . . . . . . . . . . . . . . . . . .109-115
Language Contents

Overview
This Operating Manual covers information on safety and cautions.
Please read the relevant information carefully and observe all the
Warnings and Notes strictly.
Limit 300 are 3 1/2 digits with steady operations, fashionable design
and highly reliable hand-held measuring instrument.
General Specifications
Measuring range and accuracy see page 2-3.
•Maximum Voltage (including transient overvoltage) between any
Terminals and Grounding: 500V rms.
•Fused Protection for VΩmA Input Terminal: 315mA, 250V fast
type,o5x20 mm
•10A Terminal: Un-fused.
•Range: Manual ranging
•Maximum Display: Display: 1999 or 31/2 digits.
•Measurement Speed: Updates 2~3 times /second.
•Temperature: Operating: 0°C~40°C (32°F~104°F).
Storage: -10°C~50°C (14°F~122°F).
•
Battery Type: One piece of 9V Battery NEDA 1604 or 6F22 or 006P.
•Safety/Compliances: IEC61010 CAT.I 600V overvoltage and
double insulation standard.
•Certification:
Safety Information
This Meter complies with the standards IEC61010: in pollution
degree 2, overvoltage category (CAT I 600V, CAT II 300V) and dou-
ble insulation.
Warning
To avoid possible electric shock or personal injury, and to
avoid possible damage to the Meter or to the equipment under
test, adhere to the following rules:
6
300

7
English
•Before using the Meter inspect the case. Do not use the Meter if it
is damaged or the case (or part of the case) is removed. Look for
cracks or missing plastics. Pay attention to the insulation around
the connectors.
•Inspect the test leads for damages insulation or exposed metal.
Check the test leads for continuity.
•Do not apply more than the rated voltage, as marked on the
Meter, between the terminals or between any terminal and the
grounding.
•The rotary switch should be placed in the right position and no
any changeover of range shall be made during measurement is
conducted to prevent damage of the Meter.
•When the Meter working at an effective voltage over 60V in DC or
42V rms in AC, special care should be taken for there is danger of
electric shock.
•Do not use or store the Meter in an environment of high tempera-
ture; humidity, explosive, inflammable and strong magnetic fiels.
The performance of the Meter may deteriorate after dampened.
•
When using the test leads, keep your fingers behind the finger guards.
•Disconnect circuit power and discharge all high-voltage capacitors
before testing resistance, continuity, diodes and current.
•Before measuring current, check the Meter´s fuses and turn off
power to circuit before connecting the Meter to the circuit.
•Replace the battery as soon as the battery indicator appears. Whit
to low battery, the Meter might produce false readings that can
lead to electric shock and personal injury.
Functional Buttons
Hold • ON/OFF for hold function.
•H shows on the display when value is hold.
Blue • ON/OFF for display back light.

8
300
Voltage measurement DC and AC (see fig 1)
1. Insert the red test lead into the VΩmA terminal and the black test
lead into the COM terminal.
2. Set the rotary switch to an appropriate measurement position in
V--range for DC or V~ for AC. When the value is unknown
always start from the max range 500 V.
3. Connect the test leads across with the object being measure.The
measured value shows on the display.
Note
•Displays 1 selected range is overload; it is required to select a
higher range in order to obtain a correct reading.
•In each range, the Meter has an input impedance of approx.
10MΩ. This loading effect can cause measurement errors in high
impedance circuits. If the circuit impedance is less than or equal
to 10kΩ, the error is negligible (0.1% or less).
DC Current Measurement (see fig 2).
Warning
Never attempt an in-circuit current measurement where the voltage
between terminals and ground is greater than 60V.
If the fuse burns out during measurement, the Meter may be dama-
ged or the operator himself may be hurt. Use proper terminals, func-
tion, and range for the measurement.
When the testing leads are connect-ed to the current terminals, do
not parallel them across any circuit.
To measure current, connect as follows:
1.
Turn off power to the circuit. Discharge all high-voltage capacitors.
2. Insert the red test lead into the 10A or VΩmA terminal and the
black test lead into the COM terminal.
3. Set the rotary switch to an appropriate measurement position in
A... range. When the value is unknown always start from the
max range 10 A.

9
English
4. Break the current path to be tested. Connect the red test lead to
the more positive side of the break and the black test lead to the
more negative side of the break.
5. Turn on power to the circuit. The measured value shows on the
display.
Resistance measurement
1. Insert the red test lead into the VΩmA terminal and the black test
lead into the COM terminal.
2. Set the rotary switch to an appropriate measurement position in
Ωrange.
3. Connect the test leads across with the object being measured.
The measured value shows on the display.
Note
•The test leads can add 0.1Ωto 0.3Ωof error to resistance measu-
rement. To obtain precision readings in low-resistance measure-
ment, that is the range of 200Ω, short-circuit the input terminals
beforehand and record the reading obtained. This is the addi-
tional resistance from the test lead. When 1 displays the resistance
are higher than selected range.
Diode test (see fig 3)
Use the diode test to check diodes, transistors, and other semicon-
ductor devices. The diode test sends a current through the semicon-
ductor junction, and then measures the voltage drop across the
junction. A good silicon junction drops between 0.5V and 0.8V.
To test a diode out of a circuit, connect the as follows:
1. Insert the red test lead into the VΩmA terminal and the black test
lead into the COM terminal.

10
2. Set the rotary switch to diode position.
3. For forward voltage drop readings on any semiconductor compo-
nent, place the red test lead on the component’s anode and
place the black test lead on the component’s cathode.
The measured value shows on the display.
Continuity test (see fig 3)
To test for continuity, connect as follows:
1. Insert the red test lead into the VΩmA terminal and the black test
lead into the COM terminal.
2. Set the rotary switch to continuity position.
3. Connect the test leads across with the object being measured.
The buzzer sounds if the resistance of a circuit under test is less
than 70Ω.
Temperature measurement (see fig 4)
1. Insert the red temperature probe into the VΩmA°C°F terminal
and the black temperature probe into the COM temperature.
2. Set the rotary switch to °C or °F position.
3. Place the temperature probe to the object being measured. The
measured value shows on the display.
Note
•The Meter automatically displays the temperature value inside
the Meter when there is no temperature probe connected.
•The included point contact temperature probe can only be used
up to 250 °C(482°F).
•The temperature function is type K. For measuring higher tempe-
ratures other probes of type K can be used together with a multi
socket.
300

11
Replacing the Battery (see fig 5)
1. Disconnect the connection between the testing leads and the cir-
cuit under test when battery indicator appears on the display.
2. Turn the Meter to OFF position.
3. Remove the screw, and separate the case bottom from thecase
top.
4. Replace the battery with a new 9V battery (NEDA 1604 or 6F22
or 006P).
5. Rejoin the case bottom and case top, and reinstall the screw.
Replace the fuse (see fig 5)
1. Disconnect the connection between the testing leads and the cir-
cuit under test.
2. Turn the Meter to OFF position.
3. Remove the screw and separate the case bottom from the case
top.
4. Remove the fuse by gently prying one end loose, and then take
out the fuse from its bracket.
5. Replace only fuses with the identical type and specification as
follows. 315mA, 250V, fast type, 5x20mm.
6. Rejoin the case bottom and case top, and reinstall the screw.
Replacement of the fuses is seldom required. Burning of a fuse
always results from improper operation.
English