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PARTS LIST

If you are a student, and any parts are missing or damaged, please see instructor or bookstore.
If you purchased this kit from a distributor, catalog, etc., please contact Elenco

®

Electronics (address/phone/e-

mail is at the back of this manual) for additional assistance, if needed.  

DO NOT

contact your place of purchase

as they will not be able to help you.

RESISTORS

Qty.

Symbol

Value

Color Code

Part #

1

R10

.04

Ω

Shunt Wire

100269

1

R9

.97

Ω

1% 1/2W

black-white-violet-silver-brown

109731

1

R27

4.5

Ω

1% 1/4W

yellow-green-black-silver-brown

114530

1

R11

10

Ω

1% 1/4W

brown-black-black-gold-brown

121030

1

R22

18.5

Ω

1% 1/4W

brown-gray-green-gold-brown

121832

1

R12

102

Ω

1% 1/4W

brown-black-red-black-brown

131034

1

R21

200

Ω

1% 1/4W

red-black-black-black-brown

132030

1

R7

240

Ω

1% 1/4W

red-yellow-black-black-brown

132430

1

R20

2.08k

Ω

1% 1/4W

red-black-gray-brown-brown

142034

1

R13

3k

Ω

1% 1/4W

orange-black-black-brown-brown

143033

1

R6

5k

Ω

1% 1/4W

green-black-black-brown-brown

145030

1

R31

5.6k

Ω

1% 1/4W

green-blue-black-brown-brown

145630

1

R32

8.2k

Ω

1% 1/4W

gray-red-black-brown-brown

148230

1

R25

18k

Ω

1% 1/4W

brown-gray-black-red-brown

151830

2

R35, R36

24k

Ω

1% 1/4W

red-yellow-black-red-brown

152430

1

R26

31k

Ω

1% 1/4W

orange-brown-black-red-brown

153130

1

R19

34k

Ω

1% 1/4W

orange-yellow-black-red-brown

153430

1

R5

40k

Ω

1% 1/4W

yellow-black-black-red-brown

154030

1

R23

44k

Ω

1% 1/4W

yellow-yellow-black-red-brown

154430

1

R17

83.3k

Ω

1% 1/4W

gray-orange-orange-red-brown

158330

1

R34

100k

Ω

1% 1/4W

brown-black-black-orange-brown

161030

1

R4

150k

Ω

1% 1/4W

brown-green-black-orange-brown

161533

1

R33

165k

Ω

1% 1/4W

brown-blue-green-orange-brown

161630

1

R18

195k

Ω

1% 1/4W

brown-white-green-orange-brown

161930

1

R30

260k

Ω

1% 1/4W

red-blue-black-orange-brown

162630

1

R16

360k

Ω

1% 1/4W

orange-blue-black-orange-brown

163630

1

R3

800k

Ω

1% 1/4W

gray-black-black-orange-brown

168030

1

R29

820k

Ω

1% 1/4W

gray-red-black-orange-brown

168230

1

R15

1.8M

Ω

1% 1/2W

brown-gray-black-yellow-brown

171831

1

R28

3M

Ω

1% 1/2W

orange-black-black-yellow-brown

173031

1

R2

4M

Ω

1% 1/2W

yellow-black-black-yellow-brown

174031

1

R14

6.75M

Ω

1% 1/2W

blue-violet-green-yellow-brown

176731

1

R1

15M

Ω

1% 1/2W

brown-green-black-green-brown

181531

1

R24

10k

Ω

Potentiometer

191508

1

R8

680

Ω

Potentiometer

191660

* NOTE:

All fixed resistors are 1% tolerance (last stripe, brown).  In some cases, resistors with a .5% tolerance

(last stripe, green) may be used in place of the 1% resistors.

CAPACITORS AND INDUCTORS

Qty.

Symbol

Value

Marking

Part #

1

C4

.001

μ

F Discap

(102)

231036

1

C3

.047

μ

F Discap

(473)

234710

1

C1

.047

μ

F, 400V Mylar

(473)

245028

1

L1

57.4mH

Coil

455577

Note:

C2 is not used.

-1-

Caution:  Do not mix alkaline, standard (carbon-zinc), or rechargeable (nickel-cadmium) batteries.

Содержание M-1250K

Страница 1: ...lenco Electronics Inc All rights reserved Revised 2007 REV H 753070 No part of this book shall be reproduced by any means electronic photocopying or otherwise without written permission from the publi...

Страница 2: ...9 34k 1 1 4W orange yellow black red brown 153430 1 R5 40k 1 1 4W yellow black black red brown 154030 1 R23 44k 1 1 4W yellow yellow black red brown 154430 1 R17 83 3k 1 1 4W gray orange orange red br...

Страница 3: ...Wire 27AWG Bare 65mm 2 55 or two 25 4mm 1 wires 83J400 1 Lead Free Solder Tube 9LF99 1 Test Lead Set 9TL11 Specifications Measurement Ranges Accuracy Remarks DC Voltage DCV All ranges 3 FS Input impe...

Страница 4: ...er smoothly indicating a good solder joint Use only rosin core solder DO NOT USE ACID CORE SOLDER Do not blob the solder over the lead because this can result in a cold solder joint 3 CONSTRUCTION 1 S...

Страница 5: ...een orange brown R25 18k 1 1 4W Resistor brown gray black red brown R14 6 75M 1 1 2W Resistor blue violet green yellow brown R15 1 8M 1 1 2W Resistor brown gray black yellow brown R16 360k 1 1 4W Resi...

Страница 6: ...rown R4 150k 1 1 4W Resistor brown green black orange brown R5 40k 1 1 4W Resistor yellow black black red brown R11 10 1 1 4W Resistor brown black black gold brown R9 97 1 1 2W Resistor black white vi...

Страница 7: ...igure C F1 Fuse Clips Fuse 0 5A see Figure J R10 04 Shunt Wire see Figure G Mount the 10k potentiometer to the foil side of the PC board in the location shown Solder and cut off the excess leads Use t...

Страница 8: ...Solder the white buzzer wire to point BU on the PC board Solder the green buzzer wire to point BK on the PC board Tin both ends of the 3 5 red wire and solder to point 3V on the PC board Tin both end...

Страница 9: ...OVEMENT WIRES TO PC BOARD Tin the ends of the meter wires Solder the red meter wire to M and the black wire to M on the foil side of the PC board see Figure N 8 M M M M Buzzer Assembly Red Wire Figure...

Страница 10: ...clip as shown in Figure O Solder the red and white wires from the PC board locations 3V and 3V to the single battery contacts see Figure P Solder the red and yellow wires from the PC board locations...

Страница 11: ...reading of 0 4V 40 on 50 scale on the M 1250 meter If a DC power supply or an accurate voltmeter is not available then use a fresh 1 5V battery and adjust R6 to read 1 55V on the 2 5V scale 155 on 25...

Страница 12: ...VER AND 0 ADJ KNOB Install the bottom case and mount into place with an M4 x 10 screw as shown in Figure Q Place the 0 ADJ knob onto the front of the unit on the upper right of the panel Figure Q M4 x...

Страница 13: ...age reading 1 Check for open fuse Refer to Figure 3 for a better understanding 2 Check diodes D1 D2 for opens and shorts of how the meter works 3 Check resistors R8 R14 R17 for correct values and good...

Страница 14: ...the Dial Scale Reading Exercise included with this kit Before starting tests set the meter needle to zero The zero adjust screw is located on the meter face next to the base of the needle With no tes...

Страница 15: ...t The hFE of a transistor is read using the six small input sockets To measure the hFE beta of an NPN transistor proceed as follows 1 If you removed the 1 5 volt battery from the multimeter replace it...

Страница 16: ...ified diagram of the DC voltage measuring circuit Here resistors are switched in series with the meter to provide the desired ranges Figure 4 Buzzer Test 1 Set the range switch to the BUZZ position 2...

Страница 17: ...t On the 250VAC range the input impedance is therefore 2M Figure 5 Resistance Measurement Figure 7 shows a simplified diagram of the resistance measuring circuit Here a known 1 resistor in parallel wi...

Страница 18: ...transistor may be read on the hFE scale Figure 8 17 Battery Test Figure 9 shows a simplified diagram of the battery measuring circuit The battery voltage is measured under a 0 25A load DC NULL Test Fi...

Страница 19: ...SCHEMATIC DIAGRAM M 1250K 18 Pin out 2SC1815 2SA1015 E C B...

Страница 20: ...Elenco Electronics Inc 150 Carpenter Avenue Wheeling IL 60090 847 541 3800 Web site www elenco com e mail elenco elenco com...

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