Elenco Electronics M-2666K Assembly And Instruction Manual page 22

Wide range digital multimeter with capacitance and transistor testing features
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Assembled View for Section B
Attach the LCD to the PC board using the two 2.5
x 8mm screws. Use the top-mounting hole and
lightly tighten the screws.
Testing Procedure
Capacitance
1. Place the top label over the knob and turn the
range selector knob to a capacitance (C) scale
position.
2. Connect the 9V battery to the battery snap.
3. Connect the short test leads (red lead to V CAP
and black to COM).
pressing the power switch.
4. Capacitance - Measure a cap with another
meter and then connect the capacitor to the
meter leads. Adjust VR3 so that the meter reads
the same as the accurate one. This calibrates
capacitance circuit of meter. Using two or three
different value capacitors, check each scale. If
the test is not working check components R40-
R48, VR3, C12 –C15, D6 - D9, and IC3.
DO NOT PROCEED TO SECTION F WITHOUT INSTRUCTOR'S APPROVAL.
Turn the meter on by
Assembled Views for Section E
Transistor - Set the meter in the h
an NPN transistor into the socket. Make sure that
the transistor is in correctly. Depending on the type
of transistor, the meter will range from 20 to 550.
Place a PNP transistor into the PNP socket; the
range will also be 20 to 550. If the tests are not
working, check components R49 – R50, and the
transistor sockets.
5. Turn the meter off and remove the battery, top
label, and test leads.
-21-
scales. Place
FE

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