-6-
ASSEMBLY
The meter kit has been divided into a number of
sections to make the assembly easy and avoid
major problems with the meter operation.
OPEN ONLY THOSE COMPONENT BAGS THAT
ARE CALLED FOR IN YOUR ASSEMBLY
PROCEDURE.
DO NOT OPEN ANY OTHER
BAGS.
Do not build more than one section of your meter at
a time. Your instructor must approve the proper
operation of the section you have built before you
proceed to the next section. This procedure will
minimize the problems you may have at the
completion of the project.
Your kit program is divided into Sections “A – F”.
The small parts bags will be marked accordingly.
The sections are listed below.
Section A - Meter display circuit assembly.
Section B - DC voltage and current circuit
assembly.
Section C - AC voltage and current circuit
assembly.
Section D - Resistance circuit assembly.
Section E - Capacitance and transistor testing
circuit assembly.
Section F - Final assembly.
IMPORTANT CONSTRUCTION NOTES
1. Wash your hands with soap and water before you
assemble this kit. The high impedance areas on
the circuit board can be contaminated by salt
and oil from your skin. If these areas become
contaminated, your completed multimeter may
not meet the listed specifications.
Handle the
circuit board only by its edges.
2. Avoid any excessive accumulation of resin build-
up whenever you solder a connection.
3. Take your time assembling the circuit board.
Work at a slow pace. Remember that accuracy
is far more important than speed.
4. When you perform the steps in assembly, identify
each respective component before you install it.
Then position it over its outline on the top legend
side of the PC board, unless otherwise indicated.
5. Check for the proper polarity of ICs, diodes,
electrolytic capacitors, battery snap and LCD.
Transistor h
FE
Range
Test Condition
NPN
10mA 2.8V
PNP
10mA 2.8V
Diode Test
Measures forward resistance of a semiconductor junction in k Ohm at max. test current of 1.5mA.
3. OPERATION
3-1 Preparation and caution before measurement
-29-
LCD Display
Range Selector Knob
Capacitor Input Socket
20A Input Jack
(200mA Max) A input Jack
Selector Switch
h
FE
Input Socket
Volt Ohm Input Jack
Common Input Jack
1. If the function must be switched during a
measurement, always remove the test leads
from the circuit being measured.
2. If the unit is used near noise generating
equipment, be aware that the display may
become unstable or indicate large errors.
3. Avoid using the unit in places with rapid
temperature variations.
4. In order to prevent damage or injury to the unit,
never fail to keep the maximum tolerable voltage
and current, especially for the 20A current range.
5. Carefully inspect the test lead.
If damaged,
discard and replace.
3-2 Panel Description
