-17-
DIODE CHECK
1) Connect the black test lead to the “COM”
terminal.
2) Connect the red test lead to the “V
Ω
mA” 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) 100
Ω
.
r
B) 1000
Ω
.
r
C) 100k
Ω
.
r
D) 1M
Ω
.
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) 50.5k
Ω
+5%.
r
B) 5.15k
Ω
+10%.
r
C) 5.05k
Ω
+.5%.
r
D) 5.05k
Ω
+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 V
Ω
mA.
r
B) COM and 10A.
r
C) 10A and V
Ω
mA.
r
D) COM and Building GND.
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