Elenco 3 1/2 Digit Cap. / Trans. Kit Manual de usuario descargar pdf (Pagina 10)

Amps Section

1. μA/mA scale not working:

A. Check fuse.

B. Measure across (μA/mA) terminal and

(COM) terminal and check the following

settings:

200μ = 1kΩ 2m = 100Ω

20m = 10Ω 200m = 1Ω

1. Lower or higher check R19 - R23.

2. 10A scale not working:

A. Check shunt.

Capacitance Section

1. Connect the .1μF cap to the meter and check pin

14 and pin 1 of U3 with a scope (meter set to 2N).

Pin 14 350Hz - 400Hz 5Vpp.

Pin 1 350Hz - 400Hz .14Vpp.

A. No signal at pin 14.

1. Check R40 - R43, C12, C13, and IC3.

B. No signal at pin 1 but present at pin 14.

1. Check R44, R45, VR1, D6, and D7.

Pin 8 350Hz - 400Hz .3Vpp.

C. No signal at pin 8.

1. Check R46 - R48, D8, D9, C14, and

C15.

hFE Section

1. Check for shorts on socket pins.

2. Measure across base (B) terminal to COM

terminal for 209kΩ to 231kΩ.

A. Lower or higher than value; Check R49

(NPN) and R50 (PNP).

Decimal Point Section

1. Displays two decimal points.

A. Shorted resistors R7 - R9.

2. No decimal points displayed.

A. Check R7 - R9.

Diode

1. Measure voltage across V OHM and COM

terminal (set in diode mode) = 3V.

A. Low voltage, check R51, R53, and R54.

Buzzer

U2 Voltages

Pin 1 of IC2 - 1.5kHz.

-26-

No Sound Sound

Pin 1 –5.5 Pin 1 –1.87

Pin 2 –5.5 Pin 2 –1.87

Pin 3 –5.5 Pin 3 –1.87

Pin 4 3 Pin 4 3

Pin 5 0 Pin 5 0

Pin 6 3 Pin 6 0

Pin 7 –5.5 Pin 7 1.87

1.6Vpp

-9-

RESISTOR READING EXERCISE

(1) yellow-black-black-black-brown

(3) brown-red-violet-red-brown

(5) brown-black-black-black-brown

(7) white-black-black-yellow-green

(9) brown-black-black-orange-green

(11) gray-white-black-black-brown

(2) white-black-black-red-green

(4) green-black-green-brown-green

(6) brown-green-gray-orange-brown

(8) white-black-black-silver-green

(10) orange-white-red-red-brown

(12) brown-brown-black-red-brown

Answers to Resistor Reading Exercise: 1) 400Ω+1%; 2) 90kΩ+.5%; 3) 12.7kΩ+1%; 4) 5.05kΩ+.5%; 5) 100Ω+1%;

6) 158kΩ+

1%; 7) 9MΩ+.5%; 8) 9Ω+.5%; 9) 100kΩ+.5%; 10) 39.2kΩ+1%; 11) 890Ω+1%; 12) 11kΩ+1%;

Before starting assembly of your digital multimeter

project, you should be thoroughly familiar with the 5

band color code system. Many of the resistor values

will be identified by color bands and it is easy to

mistake their value if you read the colors incorrectly

or read the value from the wrong end. Do the

following exercise in resistor values. Place your

answer in the box beneath the resistor. Answers are

on the bottom of this page.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 35 36

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Elenco 3 1/2 Digit Cap. / Trans. Kit Manual de usuario Pagina 10

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