JBM 50942 Manual De Instrucciones página 9

6.2. MEASURING CURRENT
1) Connect the BLACK test lead to the "COM" jack. If the current to be measured is less than 200mA, connect the red test lead to the
"mA"/"A" jack. If the current is between 200mA/2A and 20A, connect the red test lead to the "20A" jack instead.
2) Set the function switch to desire A
If the current magnitude to be measured is not known beforehand, set the ranges switch to the highest range position and then
reduce it range by range until satisfactory resolution is obtained.
3) If the current magnitude to be measured is not known beforehand, select the highest range.
4) Connect test leads in series with the circuit to be measured.
5) Read the reading on the display. For DC current measurement, the polarity of the red test lead connection will be indicated as well.
Note: When the display shows the over range symbol "1", a higher range must be selected.
6.3. MEASURE RESISTANCE
1) Connect the BLACK test lead to the "COM" jack and the RED to the "VΩ" jack (Note: The polarity of the red test lead is positive "+").
2) Set the range switch to desire Ω range
3) If the current magnitude to be measured is not known beforehand, select the highest range.
4) Connect the test leads across the load to be measured.
5) Read the reading on the display.
Note:
a. For resistance measurements >1MΩ, the meter may take a few seconds to stabilize reading. This is normal for high-resistance measurement.
b. When the input is not connected, i.e. at open circuit, the symbol "1" will be displayed as an over range indicator.
c. Before measuring in-circuit resistance, be sure that the circuit under test has all power removed and all capacitors are fully discharged.
d. 200MΩ range has a 10 digits (1MΩ) constant, the figure will appear in short circuit status it should be subtracted from measurement
result, for instance: when measuring 100MΩ resistor, figure 101.0 will be shown in display and the last 10 digits should be subtracted.
6.4. CONTINUITY TEST
1) Connect the BLACK test lead to the "COM" jack and the RED to the "VΩ" jack (Note: The polarity of the red test lead is positive "+").
2) Set the range switch to range
3) Connect the test leads across the load to be measured.
4) If the circuit resistance is lower than about 30±20Ω, the built-in buzzer will sound.
6.5. DIODE TEST
1) Connect the BLACK test lead to the "COM" jack and the RED to the "VΩ" jack (Note: The polarity of the red test lead is positive "+").
2) Set the range switch to
3) Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode.
4) The meter will show the approximate forward voltage of the diode. If the connections are reversed, "1" will be shown on the display.
6.6. TRANSISTOR TEST
1) Set the range switch to hFE range.
2) Identify whether the transistor is NPN or PNP type and locate Emitter, Base and Collector lead. Insert the leads of the transistor to
be tested into the proper holes of the hFE socket.
3) LCD display will show the approximate hFE value.
6.7. MEASURING TEMPERATURE
1) Set the range switch to °C range.
2) Connect the K type thermocouple to meter. BLACK plug to the "COM" jack and the RED to the "mA" jack (Note: The polarity of the
red test lead is positive "+").
3) Insert the black (or "-") plug of the K type thermocouple to the adapter "-" socket, and the red (or "+") plug to the adapter "+" socket.
4) Carefully touch the end of the thermocouple to the object to be measured.
5) Wait a while, read the reading on the display.
6.8. CAPACITANCE MEASURING
1) Connect the BLACK test lead to the COM jack and the RED to the mA jack.
2) Set the function switch at F position. (NOTE: The polarity of the RED lead is positive "+")
3) Connect test leads across the capacitor under measure and be sure the polarity of connection is observed.
Note: To avoid damage to the Meter, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance.
The tested capacitor should be discharged before the testing procedure. Never apply voltage to the input, or serious damage may result.
6.9. FREQUENCY MEASURING
1) Set the function range switch to the required "Hz" position.
2) Connect the BLACK test lead to the "COM" jack and the RED to the "VΩ" jack (Note: The polarity of the red test lead is positive "+").
3) Connect the test leads across the load to be measured.
Note: Do not apply more than 250V rms to the input. Indication is possible a voltage higher than 100V rms, but reading maybe out
of specification.
6.10. LOGIC TEST
1) Set the function range switch to "LOGIC" position.
2) Connect the BLACK test lead to the "COM" jack and the RED to the "VΩ" jack (Note: The polarity of the red test lead is positive "+").
3) Connect the test leads across the load to be measured.
Note: Do not apply more than 250V rms to the input.
7. AUTO POWER OFF
If power on the meter for about 15 minutes, it will turn off automatically. To turn on it again, just push the power button twice.
8. LCD DISPLAY PANEL ANGLE SELECTION
LCD display panel is locked in lie down position in normal operating condition and storage, when the usage needs
to change the display panel angle, push down the button which is above the top case, the display panel locking
will be released. The display panel can be rotated to the best angle.
or A range.
range
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