Elenco 3 1/2 Digit Cap. / Trans. Kit - Manual (Page 9)

PART IDENTIFICATION CARDS
To help identify the resistors and diodes used in the construction of your digital
multimeter we have mounted the diodes and resistors of each section onto a card.
The card will help you find the diodes and resistors quickly. THE PARTS WILL NOT
NECESSARILY BE LISTED IN THE ORDER SHOWN IN THE PARTS LIST
SECTION OR IN THE ASSEMBLY PROCEDURE.
When you are ready to assemble the meter kit, follow the procedure shown. For
an example refer to page 11 for assembly of Section “A”. The first resistor called
for is R8, 470k
Ω
resistor (yellow-violet-yellow-gold). Locate it on the card ( ), verify
that it is the correct value. Some resistors may be mounted backwards on the card
so you must be certain that you are reading the resistors correctly. When the
correct value has been established, only then will you mount it into its correct
position on the PC board.
IDENTIFYING RESISTOR VALUES
Use the following information as a guide in properly identifying the value of resistors.
M-2666K
SECTION A
5 Bands
1 2 Multiplier
Tolerance
3
4 Bands
1 2 Multiplier
Tolerance
-8-
EXAMPLE
IDENTIFYING CAPACITOR VALUES
Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or
μ
F (microfarads).
Most capacitors will have their actual value printed on them. Some capacitors may have their value printed in
the following manner. The maximum operating voltage may also be printed on the capacitor.
Second Digit
First Digit
Multiplier
Tolerance *
For the No. 0 1 2 3 4 5 8 9
Multiply By 1 10 100 1k 10k 100k .01 0.1
Multiplier
Note: The letter “R” may be used at times to
signify a decimal point; as in 3R3 = 3.3
10
μ
F 16V
103K
100V
The letter M indicates a tolerance of +20%
The letter K indicates a tolerance of +10%
The letter J indicates a tolerance of +5%
Maximum Working Voltage
The value is 10 x 1,000 =
10,000pF or .01
μ
F 100V
*
Electrolytic capacitors have a positive
and a negative electrode. The
negative lead is indicated on the
packaging by a stripe with minus
signs and possibly arrowheads.
Warning:
If the capacitor
is connected
with incorrect
polarity, it may
heat up and
either leak, or
cause the
capacitor to
explode.
Polarity
Marking
-27-
Table 1
REINSTALLATION OF THE RANGE SELECTOR KNOB
If you removed the rotary selector knob for
troubleshooting, then follow the instructions below to
reinstall it.
Place the PC board over the range selector knob and
fasten the knob to the PC board with a M2.3 x 8 screw.
CAUTION: Do not over-tighten the screw. The knob
should be snug, but not loose. Turn back the M2.3 x 8
screw 1/2 turn. Slip the two shims under the knob (see
Figure W). If they do not slip in, turn back the screw
another 1/4 turn. Tighten the screw just enough so that
the shims can be pulled out. You should now have the
proper tension to hold the knob and contacts in place and
rotate the knob to the desired positions.
MEASURED RANGE SETTING
RESISTANCE 200
Ω
2k
Ω
20k
Ω
200k
Ω
2M
Ω
20M
Ω
00.1 .000 0.00 00.0 .000 0.00
INFINITY 1 . 1. 1 . 1 . 1. 1 .
47
Ω
52.1 .052 0.05 00.0 .000 0.00
270
Ω
1 . .267 0.26 00.2 .000 0.00
10k
Ω
1 . 1. 10.18 10.2 .010 0.01
47k
Ω
1 . 1. 1 . 52.7 .052 0.05
470k
Ω
1 . 1. 1 . 1 . .472 0.47
2.2M
Ω
1 . 1. 1 . 1 . 1. 2.12
SHORT
(LEADS TOUCHING)
*
* RESISTANCE OF TEST LEADS
Table 2
Slide Contact
Figure W
MEASURED
VOLTAGE 200mV 2V 20V 200V 1000V
120VAC 1 . 1. 1 . 120.0 120
100VDC 1 . 1. 1 . 100.0 100
Familiarize yourself with your new digital meter by
taking readings of known resistances and voltages.
You will find that the readings will not be as accurate
on certain ranges for a given measurement. For
example, when measuring a low resistance on a
high range, the reading will show a short 0.00. When
measuring a high resistance on a low range, the
reading will show infinity 1. Likewise, it is important to use the correct range when measuring
voltages.Table 1 shows an example of the readouts
for different values of resistance. Table 2 shows an
example of the readouts for 117VAC and 100VDC.
The shaded area indicates the most accurate range.
It must be remembered that the readings will shift
slightly when switching to a different range.
Spring
Ball Bearing
Qty. Description Part #
r 1 Selector Switch 2 psc. 622666
r 2 Selector Pin 622666A
r 6 Slide Contacts 622666B
r 4 Screws - Selector Switch M1.8 x 8mm 622666C
Qty. Description Part #
r 4 Nut - Selector Switch M1.8 622666D
r 2 Ball Bearing 622666E
r 2 Spring - Selector 622666F
USING THE DIGITAL MULTIMETER
Bottom View of Selector Knob & Slide Contacts