Frequency Measurements; Capacitance Measurements; Transistor Hfe Measurements - Promax PD-181 Manual De Instrucciones

4.9 Frequency measurements

1. Set the rotary selector to the Hz position for the Frequency
measurement.
2. Insert the BLACK and RED test leads into the "COM" and "V Ω"
input terminals respectively
3. Apply the test leads to the points across which the frequency is
to be measured, and read the result directly from the display.

4.10 Capacitance measurements

1. Turn off power to the device under test and discharge all
capacitors.
2. Discharge all voltage from the capacitor before measuring its
capacitance value.
NOTE: A safe way to discharge a capacitor is to connect a 100kΩ
resistor across the two capacitor leads.
3. Set the rotary selector switch to the capacitance range that gives
the most accurate measurement reading.
4. Plug the capacitor leads into the capacitor test jacks. To pay
attention to the polarity when it measures electrolytic condensers.

4.11 Transistor hFE measurements.

1. Transistor must be out of circuit. Set the rotary selector switch to
the PNP or NPN position, according to the type of transistor to be
measured.
2. Plug the emitter, base and collector leads of the transistor into
the correct holes in either the NPN or the PNP transistor test
socket. Read the hFE beta, (DC current gain) in the display
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