Elenco Compact Digital Multimeter - Manual (Page 18)

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DIODE CHECK
1) Connect the black test lead to the “COM”
terminal.
2) Connect the red test lead to the “V
ΩmA” terminal.
3) If the diode being measured is connected to a
circuit, turn off all power to the circuit and
discharge all capacitors.
4) Set the range switch to “ ”.
Forward Voltage Check
5) Connect the red lead to the anode and the black
lead to the cathode of the diode. Normally the
forward voltage drop of a good silicon diode
reads between 450 and 900mV.
Reverse Voltage Check
6) Reverse the leads to the diode. If the diode is
good, an overrange indication is given (a 1 in the
most significant digit and blanks in the remaining
digits). If the diode is bad, “000” or some other
value is displayed.
h
FE
MEASUREMENTS
1) Set the range switch to h
FE
and
insert the test transistor into the
appropriate NPN or PNP holes in
the transistor socket.
2) Read the h
FE
of the transistor.
CONTINUITY CHECK
1) Set the range switch to the “ ” position.
2) Touch the tips across two points and if the
resistance is less than 20
Ω the buzzer will sound.
BATTERY & FUSE REPLACEMENT
If “ ” appears on the display, it indicates that the
battery should be replaced.
To replace battery and fuse (200mA/250V), remove
the 2 screws in the bottom of the case. Simply
remove the old fuse/battery and replace with a new
fuse/battery. Fuse 200mA # 530020.
QUIZ
1. The function of the A/D converter is to . . .
r A) convert digital to analog.
r B) divide the analog signal by 2.
r C) convert analog to digital.
r D) convert AC to DC.
2. The divider used for DC voltage measurements is a . . .
r A) divide by 20.
r B) capacitance divider.
r C) divide by 5.
r D) resistor divider.
3. When the AC voltage is measured, it is first . . .
r A) divided by 2.
r B) rectified.
r C) divided by 100.
r D) sent to a high pass filter.
4. When measuring current, the shunt resistors convert
the current to . . .
r A) –0.199 to +0.199 volts.
r B) –1.199 to +1.199 volts.
r C) –0.099 to +0.099 volts.
r D) –199 to +199 volts.
5. The DC voltage divider resistors add up to . . .
r A) 100Ω.
r B) 1000Ω.
r C) 100kΩ.
r D) 1MΩ.
6. Resistance measurements are made by . . .
r A) comparing voltage drops in the unknown
resistor and a reference resistor.
r B) measuring the current in the unknown resistor.
r C) measuring the current in the reference resistor.
r D) equalizing the voltage drops in the unknown
and the reference resistors.
7. The measurement cycle performed by the A/D con-
verter can be divided into time periods known as . . .
r A) long and short.
r B) autozero, integrate and read.
r C) zero, read and interphase.
r D) convert, integrate and display.
8. A resistor with the band colors green-black-green-
brown-green is . . .
r A) 50.5kΩ +5%.
r B) 5.15kΩ +10%.
r C) 5.05kΩ +.5%.
r D) 5.05kΩ +1%.
9. The M-1008K has . . .
r A) a 3 digit display.
r B) a 3½ digit display.
r C) a 4½ digit display.
r D) none of the above.
10. When measuring 450mA, the meter leads should be
connected to . . .
r A) COM and VΩmA.
r B) COM and 10A.
r C) 10A and VΩmA.
r D) COM and Building GND.
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