zenitech 161071 Manual De Usuario página 16

4.2 DC current / AC current
Warning
To avoid personal injury or damage to the equipment or the material being tested, always
ensure that the rotary switch is in the correct position and that the test leads are connected to
the correct sockets before taking a reading.
• Turn the rotary knob to select the appropriate voltage range.
• Connect the black test probe to the COM jack. If the current to be measured is below
200mA, connect the red test probe to terminal mA; if it is over 200mA, connect it to the 10A
jack.
• Disconnect the circuit and connect the test probes to the tested circuit in series.
• Read the measured current on the display. When measuring a DC current, the display shows
the polarity of the red test probe.
• The display of the number «1» indicates that the value exceeds the upper limit of the
selected range. In this case, select a higher range with the rotary knob.
4.3 Resistance
Warning
Turn off the circuit before measuring resistance, and discharge all capacitors completely.
• Turn the rotary knob to select the corresponding voltage range.
• Connect the red test probe to the input jack "mAVΩ" and the black test probe to the COM
socket.
• Connect the probes to the resistor or to the circuit under test and read the value on the
screen.
• When measuring small resistances, shortcircuit the probes and point out the value on the
screen. Then connect the test probes to the resistor being measured and subtract the value of
the shorted resistor.
Note :
• If the measured resistance is greater than 1MΩ, wait a few seconds for the display to
stabilize. This is common practice for measuring high resistances.
• When the circuit is open, or when the test leads are not connected, «1» appears on the
display.
4.4 Diode
Warning
Before testing a diode, turn off the power and discharge all capacitors completely.
• Set the rotary knob to
• Connect the red test probe to the input socket
socket.
• Connect the red test lead to the anode (+) and the black test lead (-) to the diode.
The display shows the approximate voltage drop of the diode. If the test leads are reversed,
the number «1» will be visible on the display.
4.5 Gain hFE of a transistor
Warning
To avoid damaging the device, make sure that the transistor is not connected to any circuit
before the measurements are taken.
• Set the rotary knob to hFE.
• Connect the adapter for transistor test by inserting the «IN» end into the «hFE» input jack
and the «COM» end into the «COM» jack.
• Insert the transistor into the corresponding slots (NPN or PNP) of the adaptor to perform the
measurement.
• Read the gain of the transistor on the display screen.
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and the black test probe to the COM