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Profile PIN-142 Seite 6

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6-8 Continuity
range
Function
Built-in buzzer will sound if resistance is lower
than 80Ω
-- over-load protection: 250V effective value
-- open circuit voltage: approximate 3.0V
7. OPERATING INSTRUCTIONS
7-1 Attention before operation
a. If the battery voltage is less than 7V, the display will show “ ”, the
battery should be replaced at this time to ensure measuring precision.
b. Pay attention to the “ ” besides the input jack which shows that the
input voltage or current should be within the specified value.
c. The range switch should be positioned to the desired range for
measurement before operation.
7-2 Measuring DC Voltage
a. Connect the black test lead to COM jack and the red to VΩmA jack.
b. Set the rotary switch at the desired V range position.
c. Connect test leads across the source or load under measurement.
d. You can get the reading from LCD. The polarity of the red lead
connection will be indicated along with the voltage value.
NOTE:
1. When the value scale to be measured is unknown beforehand, set
the range selector at the highest position.
2. When only the figure ‟1‟ or „-1‟ is displayed, it indicates over-range
situation and a higher range has to be selected.
3. “ ” means you can‟t input the voltage more than 600V, it‟s
possible to show higher voltage, but it may destroy the inner circuit or
pose a shock.
4. Be cautious against shock when measuring high voltage.
7-3 Measuring AC Voltage
a. Connect the black test lead to COM jack and the red to VΩmA jack.
b. Set the rotary switch at the desired V~ range position.
c. Connect test leads across the source or load under measurement.
d. You can get reading from LCD.
NOTE:
1. When the value scale to be measured is unknown beforehand, set
the range selector at the highest position.
2. When only the figure ‟1‟ or „-1‟ is displayed, it indicates over-range
situation and a higher range has to be selected.
3. “ ” means you can‟t input the voltage more than 600V, it‟s
possible to show higher voltage, but it may destroy the inner circuit or
pose a shock.
4. Be cautious against shock when measuring high voltage.
7-4 Measuring DC Current
a. Connect the black test lead to COM jack and the red to the VΩmA jack
for a maximum 200mA current , for a maximum 10A current, move the red
lead to the 10A jack.
b. Set the rotary switch at the desired A range position.
c. Connect test leads in series with the load under measurement.
d. You can get reading from LCD. The polarity of the red lead connection
will be indicated along with the current value.
NOTE:
1. When the value scale to be measured is unknown beforehand, set the
range selector at the highest position.
2. When only the figure ‟1‟ or „-1‟ is displayed, it indicates over-range
situation and a higher range has to be selected.
3. “ ” means the socket mA‟s maximum current is 200mA and 10A‟s
maximum current is 10A, over current will destroy the fuse. Since 10A is
not fused, the measuring time should be less than 1 second to prevent
precision from affecting by circuit heating.
7-5 Measuring Resistance
a. Connect the black test lead to COM jack and the red to VΩmA jack.
b. Set the rotary switch at the desired Ωrange position.
c. Connect test leads across the resistance under measurement.
d. You can get reading from LCD.
NOTE:
1. When only the figure ‟1‟ or „-1‟ is displayed, it indicates over-range
situation and the higher range has to be selected.
2. For measuring resistance above 1MΩ, the meter may take a few
seconds to get stable reading.
3. When the input is not connected, i.e. at open circuit, the figure „1‟ will
be displayed.
4. When checking in-circuit resistance, be sure the circuit under test has
all power removed and that all capacitors have been discharged fully.
5. If the value scale to be measured is unknown beforehand, set the
range selector at the highest position.
7-6 Measuring Temperature
a. Set the rotary switch at the °C position.
b. The LCD will show the current temperature of the environment.
c. When measuring temperature at a certain point, temperature probe for
this meter can be used. Insert „K‟ type thermocouple probe (red one into
VΩmA jack and black one into COM jack)
7-7 Transistor Testing
a. Set the rotary switch at ‟hFE‟ position.
b. Determine whether the transistor under testing is NPN or PNP and
locate the emitter, base and collector leads. Insert the leads into the
proper holes of hFE socket on the front panel.
c. Read the approximate hFE value at the testing condition of base
current Ib10uA and Vce 3V.
7-8 Diode Testing
a. Connect the black test lead to COM jack and the red to VΩmA jack.
(the polarity of red lead is „+‟)
b. Set the rotary switch at the position.
c. Connect the red lead to the anode and the black lead to the cathode of
the diode under testing.
NOTE:
1. The meter will show approximate forward voltage drop of the diode.
2. If the lead connections are reversed, only „1‟ will be displayed.
7-8 Continuity Testing
a. Connect the black test lead to COM jack and the red to VΩmA jack.
b. Set the rotary switch at the range position.
c. Connect test leads across two points of the circuit under testing.
d. If continuity exists (i.e. resistance less than about 80Ω), built-in buzzer
will sound.
NOTE:
If an open circuit is tested, the figure „1‟ will be displayed.
8. Maintenance
a. Before attempting to remove the battery door or open the case, be sure
that the test leads have been disconnected to avoid electric shock
hazard.
b. To avoid electrical shock, remove test leads from measurement circuits
before replacing the fuse. For protection against fire, replace fuses only
with specified ratings: F-200mA/250V fuse.
c. You must replace the test leads if the lead is exposed, and should
adopt leads with the same specifications as the original.
d. Use only moist fabric or small amount of detergent for cleaning, no
chemical solution.
e. Do not use the meter before the back cover is properly closed and the
screw is secured. Upon any abnormality, stop operation immediately
and send the meter for maintenance.
f. Please take out the battery when not using for a long time.
9. Accessories
[1] Test Leads: electric rating 1000V 10A
[2] Fuse: F-200mA/250V
[3] „K‟ type Thermocouple
[4] Operator‟s Manual
… 6 …

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