Assemble the LCD into the housing with the parts
shown in Figure E. The LCD must be put in with
the notch in the direction shown in Figure E. Peel
off the clear protective film on top of the LCD (see
Figure G), then place the LCD plate into the
housing with the two curved corners on the inside
of the plate in the same direction as the two
curved corners on the housing. Wipe off zebra
edges with a lint-free cloth.
Mount the LCD unit to the PC board. Insert the
two pins on the side shown in Figure E into the
holes on the PC board. Then push the other end
down until it snaps into place.
Screw the LCD housing to the PC board with two
M2.3 x 6 screws as shown in Figure E.
Testing Procedure
Placing the top plate (A) over the knob will assist in
obtaining the correct knob position when doing
tests.
Connect the 9V battery and turn the range selector.
The LCD will display random numbers. As you turn
the knob clockwise, the decimal point will move
also. Check that all of the segments that make up
the certain number are displayed.
If the LCD is
working correctly, move the knob to the off position
and remove the battery. If the tests are not working,
check for cold solder joints, part values and if the
LCD is assembled correctly.
DO NOT PROCEED
TO SECTION B WITHOUT INSTRUCTOR’S
APPROVAL.
-12-
ASSEMBLE THE LCD
Figure F
Clear Protective Film
Figure E
After the LCD unit is assembled, insert
this side into the PC board first.
LCD Housing
LCD
Notch
LCD Stopper
Zebra - Do not touch edge
PC Board
M2.3 x 6 Screws
Battery
Range
Selector Knob
LCD Window Plate
NOTE:
If the range selector switch
becomes hard to turn, then loosen the
M2.3 x 8 screw slightly.
-23-
Testing Procedure SECTION C - AC voltage
and current circuit
Measure an AC voltage with a known accurate
meter. Now measure the voltage with the kit meter.
The meters should be the same voltage.
Connect the kit meter and another meter of known
accuracy in series. Set the meters in the 200mA
position. Construct a circuit for an AC current and
measure the circuit current.
Both meters should
have close to the same readings. If the meters do
not agree, check the parts just added. Do not re-
adjust VR1 this will change the voltage reading set
in step 1. Check the 200
µ
- 200mA scales. The 20A
scale requires, a circuit of 1 - 10 amps. If the tests
are not working, check for cold solder joints and part
values.
DO NOT PROCEED TO SECTION F
WITHOUT INSTRUCTORS APPROVAL.
Testing Procedure SECTION F
Set the meter in one of the farad scales. Make sure
that SW1 is in the AC/Cap position. Measure a cap
with another meter and then insert the same cap
into the kit meters CX connectors. Adjust VR2 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. Compare the kit meter readings with another
meter. Turn the meter off and remove the battery.
Set the meter in the h
FE
scales.
Place 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 for cold solder joints and part values.
