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Insert the four input sockets into the PC board
holes and then solder the sockets in place.
Apply enough heat to allow the solder to flow
around the input sockets (see Figure J).
Solder
Input Sockets
Testing Procedure
Voltage Test
1. Place the top label over the knob and turn the
range selector knob to the 20V position.
2. Connect the 9V battery to the battery snap
3. Connect the test leads (red lead to V CAP and
black to COM). Turn the meter on by pressing the
power switch.
4. Using another meter of known accuracy,
measure a DC voltage less than 20V (such as a
9 volt battery). You will calibrate the kit meter by
measuring the same voltage source and
adjusting VR1 until the kit meter reads the same
as the accurate meter. When the two meters
agree, the voltage circuit is calibrated. Turn the
meter off and continue to the Current Test.
If the tests are not working, check components
R10 – R24, R30 – R33, VR1, and the transistor
T2.
Socket
Bottom Legend Side
Figure J
-15-
Attach the LCD to the PC board using the two
2.5 x 8mm screws. Use the two top mounting
hole and lightly tighten the screws. The screws
will be removed to assembly the next section.
Figure K
Current Test
1. Turn the range selector knob to the 200 A
position.
2. Connect the test leads (red lead to A/mA and
black to COM).
3. Connect the kit meter and another meter of
known accuracy in series. Set the both meters in
the 200 A position. Construct a circuit for a DC
current (for example 9V and a 47k
190 A) and measure the circuit. Both meters
should have close to the same readings. Check
the other DC current (2mA - 200mA) scales. The
20A scale requires a circuit of 1 - 20 amps.
If the meters do not agree, check the parts just
added. Do not readjust VR1 for this will change the
voltage reading set in step 1. If the tests are not
working, check for cold solder joints and part values.
4. Turn the meter off and remove the battery, top
label, and test leads DO NOT PROCEED TO
SECTION C WITHOUT YOUR INSTRUCTOR'S
APPROVAL.
5. Remove two display mounting screws and
display by unscrewing the two mounting screws.
2.5 x 7.5
Screws
resistor for
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