Elenco Digital Mulitmeter Kit Manual de usuario descargar pdf (Pagina 11)

-10-

RESISTANCE/DIODE TEST

1) Measure a resistor of about half of the full scale value of each resistance range. Compare the kit meter

readings to those from a meter of known accuracy.

2) Measure the voltage drop of a good silicon diode. You should read about 700mV. Power diodes and the base

to emitter junction of power transistors may read less.

If any of these tests fail:

a) Check the values and the soldering of resistors PTC - R2, R20 - R27, and R35.

1) Set the range switch to h

and insert a small transistor into the appropriate NPN or PNP holes in the

transistor socket.

2) Read the h

of the transistor. The h

of transistors varies over a wide range, but you will probably get a

reading between 100 and 300.

If this check fails:

a) Check that the transistor socket is aligned according to Figure E.

b) Check the value and soldering of resistors R18 and R19.

FINAL ASSEMBLY

r Peel the backing off of the shield label and stick it onto the case bottom in the location shown in Figure Pa.

r Snap the case bottom onto the case top and fasten with the two 10mm screws as shown in Figure P.

Case

Bottom

Screws

Case Top

Figure P

Battery

Case Bottom

Shield Label

Figure Pa

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

Sin comentarios

Elenco Digital Mulitmeter Kit Manual de usuario Pagina 11