Sears 5205 Manuale utente

FULL 1 YEAR WARRANTY ON SEARS MUL TIMETER

For one year from the date of purchase, if this multi-

meter fails to work properly due to a defect In material

or workmanship, Sears will repair it, free of charge.

WARRANTY SERVICE IS AVAILABLE BY Re-

TURNING THE MULTIMETER TO THE NEAREST

SEARS STORE, OR SERVICE CENTER IN THE

UNITED STATES.

This warranty gives you specific legal rights, and you

may also have other rights which vary from state to

state.

SEARS, ROEBUCK AND CO.

Dept. 698/731 A, SearsTower, Chicago, IL60684.

Printed in KOREA

Sears

OWNERS

M NU L

34460.5205

VOM-MUL TIMETER

with BATTERY TESTER

50,000 ohms/volts

42 RANGES

SEARS, ROEBUCK ANP CO., Chicago, IL 60684 U.S.A.

DESCRIPTION

Ideal for use where measurements must not appreciably disturb

the circuit being tested, the Model Sears 5205 features high

50,000 ohms/volt DC and 10,000 ohms/volt AC sensitivities, on

one set of voltage ranges. A second group of voltage ranges with

- sensitivities of 25,000 ohms/volt DC and 5,000 ohms/volt AC

has been designed into this instrument. Because of the avail-

ability of 12 DC voltage ranges and

AC voltage ranges, more

accurate readings are possible with this instrument than with

an ordinary VOM. Also included are ten DC current ranges and

five resistance ranges to assure precise current and resistance

indications. In conjunction with a power supply, the Model

Sears 5205 can be used to measu re capacitance and inductance.

Special circuitry has been included to protect the meter move-

ment against accidental overload. A mi rror arc has been pro-

vided to help eliminate parallax errors from readings. A con-

venient carrying handle built onto the case can also be used to

Position the meter for easy reading. The Sears 5205 is a quality

product in both performance and appearance.

SPECI FICATIONS

DC Voltage: ()'0.25, 2.5, 10, 50, 250, 1000 volts : 3 % of

full scale reading except 0.25, 2.5, 1000

volts ±4%; 25,000 ohms/volt.

()'0.125, 1.25, 5, 25, 125, 500 volts : 3 % of

full scale reading except 0.125, 1.25, 500

volts ±4%; 50,000 ohms/volt:

AC Voltage: 0-10, 50, 250, 1000 volts ±4% of full scale

reading; 5,000 ohms/volt.

0- 5, 25, 125, 500 volts ±4% of full scale

reading; 10,000 ohms/volt.

Decibels:

DC Current

-20 to +62 dB, 8 ranges.

0-25, 50 }J.A: 0-25, 5, 25, 50, 250,

500 mA;

±3

% of full scale read ing.

Ohmmeter: 0-20 Megohms in 5 ranges ±3% of full

scale arc.

1.5V AA, AAA Cell 125 mA Load Current.

1.5V C, D Cell 250 mA Load Current

9V Cell 10 mA Load Cu rrent.

One 9-volt battery (Sears Diehard AI kaline

No. 34-3094; Sears Heavy Duty No. 34-

4662) for R x 10K range; one 1.5-volt

"AA" cell (Sears Diehard AI kaline No.

34-3090) for all other ohmmeter ranges.

6-3/4" x 5" x

1 lb., 4

oz.

Battery Test:

Power Supply:

Size:

Weight:

HOW TO INSTALL BATTERIES

Remove the screws in the rear cover of the case- Lift the back of

the case off the front section. Note the orientation of the bat-

teries in their compartments. When replacing the" AA"cell, the

positive

(+)

end of the cell should be at the end so indicated on

the case closest to the top. Be sure that the contact at each end

of the compartment makes a good connection with the metallic

battery terminal at its positive end and with the metallic

portion of the battery case at its negative end.

The 9 volt battery must be so oriented that its plus terminal is at

the connector marked

"+"

in the case (closest to the side) and

its minus terminal is at the connector marked "-". Slide the

battery straight down into its compartment, being sure that it is

held firmly.

Carefully replace the back onto the front of the case. Tighten

the screws. Do not tighten them excessively, or you will strip

the threads in the case.

CONTROLS AND JACKS

RANGE switch: Select factor and range to be measured.

V-fl.-A slide switch: Meter pointer indicates DC or AC voltage

or DC cu rrent on range selected by RANGE switch, when

slide switch is set to the V-fl.-A position. Meter pointer

indicates one half the voltage or current on range selected

by RANGE switch, when slide switch is set to the V-A/2

position,

OHMS ADJ. control: Use to set pointer to 0 (extrema right on

meter scales) on uppermost ohmmeter scale in an OHMS

setting of the RANGE switch, when test leads are in contact

with each other.

Mechanical adjust: Adjustable screw on meter movement to

set pointer to zero when leads are in contact with each other

in a DCV setting of the RANGE switch.

COM jack: Plug-in connection for black, negative test lead.

Ef>V-fl.-A jack: Plug-in connection for red, positive test lead,

1000V DC jack: Plug in connection for red test lead when

measuring DC to 1,000 volts. RANGE switch must be set to

the 250

1000 DCV position and V-fl.-A slide switch must

be set to the V-fl.-A position. Voltage will be 1/2 that noted

on meter (to 500 volts) if the V-rl.-A slide switch is set in the

V-A/2 position.

BAT_ jack: Plug-in connection for red, positive test lead when

testing batteries,

RANGE switch must be set to BAT. CHECK and slide

switch must be set to the wanted position.

OPERATING PROCEDURE

PRELIMINARY ADJUSTMENTS

1. Check the mechanical adjustable screw setting as follows:

a. Place the Sears 5205 tester flat on a bench:

b. Set the RANGE switch to 2.5 DCV. The V-fl.-A slide

switch can be set in either posi

on.

c. Connect one test lead to the other,

d, Note if the meter pointer indicates exactly 0 at the

extreme left end of the black scales.

e. If it does not read 0, turn the screw on the meter move-

ments slowly until the proper 0 reading is realized.

2. Check the batteries as follows:

Place one test lead in contact with the other.

b. Set the RANGE switch to R x 1.

c. Turn the OHMS ADJ_ control until you fi nd the position

where the pointer indicates the full scale 0 on the OHMS

scale. If this adjustment cannot be made, replace the 1.5

volt size AA cell.

d. Now set the RANGE switch to R x 10K.

e. Turn the OHMS ADJ_ control until you find the position

where the meter pointer indicates full scale 0 on the

OHMS scale .. If this adjustment cannot be made, replace

the 9-volt battery.

OPERATING SUGGESTIONS

1. Meter ranges are noted on the front panel, arou nd the

RANGE switch. DC and AC voltage as well as DC current

ranges selected through use of the knob on the RANGE

switch are those shown at this switch only when the V-fl.-A

slide switch is in the V-fl.-A position. In this case, the

sensitivity of the voltmeter is 25,000 ohms/volt DC and

5,000 ohms/volt AC. Voltage and current ranges are one-

half those. shown by the knob on the RANGE switch when

the V-fJ.-A slide switch is in the V-A/2 position. The sensiti-

vity of the voltmeter is 50,000 ohms/volt DC and 10,000

ohms/volt AC. Sensitivity of 25,000 ohms/volt DC and

5,000 ohms/volt AC is excellent and acceptable in most

measu ring situations. If you must have a sensitivity of

50,000 ohms/volt DC or 10,000 ohms/volt AC at any time,

set the V-fJ.-A switch in the V-A/2 position and divide all

readings by two.

2. Set the RANGE switch to the proper voltage or current range

before making measurements. If the lowest usable range is

one of those listed on the panel at the RANGE switch, set

the V-fJ.-A slide switch to the V-fJ.-A position. If it is one-

half of a range listed on the panel at the RANGE switch, set

the V-fJ.-A slide switch to the V-A/2 position. When the

V-fJ.-A slide switch is in the V-fJ.-A position, never apply

more voltage or current than the amount noted on the front

panel in each RANGE switch position. When the V-fJ.-A

slide switch is in the V-A/2 position, never apply more

voltage or cu rrent than one-half the amou nt noted on the

front panel in each RANGE switch position. When in

doubt as to the voltage or current present in a circuit

start with the highest range and set the V-fJ.-A slide switch

to the V-fJ.-A position. If the voltage or current is of such

magnitude as to be measurable on a lower range, select the

lowest RANGE switch position which will provide you

with a reading without causing the meter pointer to deflect

off-scale. If the maximum pointer deflection is below

one-half scale on the meter, set the V-fJ.-A slide switch to

the V-A/2 position and divide all readings by 2.

3. Do not check resistance (ohms) when voltage or current.is

present in the circuit.

4. Discharge a capacitor before measuring it.

5. Avoid placing the tester in a place where severe vibration is

encountered. Do not store it in an extremely hot or humid

location.

6. Remove the batteries before storing the tester for a long

period of time. Also rotate the RANGE switch from time to

time to clean the contacts.

7. To extend the life of the batteries, never leave the RANGE

switch in an OHMS setting when you are not in the process

of measuring reistance. It is best that you keep the RANGE

switch in the OFF position when the meter is not being used.

8. For all measu rements, plug the black test lead into the

COM. jack. Plug the red test lead into the

IJ)

V-fJ.-A jack

except when measuring from 250 to 1,000 volts or check

batteries

9. You can see a reflection of the meter pointer in the mirror

arc. To avoid parallax errors in you r readings, look straight

down onto the meter scale. You are doing this perfectly if

the mi rror image of the pointer is covered by the actual

meter pointer, so ·that you do not see its reflection in the

mirror arc.

DC VOLTAGE MEASUREMENTS

Select the required DC voltage range or use the procedure in

#2 above under OPERATI NG SUGGESTIONS. Connect the

test leads across the circuit whose voltage is to be measured.

Observe polarity. Read DC voltage on the appropriate scale. Be

sure to take the setting of the V-fJ.-A slide switch into account.

The range is as indicated by the pointer knob on the RANGE

switch, when the V-D.-A slide switch is in the V-D.-A position.

The range is one-half that indicated by the pointer knob on the

RANGE switch, when the V-D.-A slide switch is in the V-A/2

position.

Select the required DC current range or use the procedure in

#2 above under OPERATING SUGGESTIONS. Connect the

test leads in series with the circuit to be measured. Observe

polarity. Read DC current on the appropriate scale. Be sure to

take the setting of the V-D. A slide switch into account, as

described in the DC VOLTAGE MEASUREMENTS section.

Should the ranges provided not be sufficient to measure current

in your circuit, the DC voltage ranges of your 5205 may be uti-

lized for this purpose. Measure the voltage across a resistor in

the circuit through which the current flows. If this is not pos-

sible, add a small resistor in series with the circuit. The added

resistor, if used, must be small enough so as not

to upset the circuit Measure the volt

this resistor. Calculate the current flowin

this resistor, using Ohm's Law. See th

in Figure 1. Here, it is assumed that

across a 1-ohm resistor. The curren

through the resistor is:

DC CURRENT MEASUREMENTS

E 2

=-- =-=

2 Amps

R 1

AC VOLTAGE MEASUREMENTS

--.L

age across

g through

e example

2 volts is

t flowing

1D.

FIGURE 1

Select the required red AC voltage range or use the procedure in

#2 above under OPERA TI NG SUGGESTIONS. Connect the

test leads across the voltage to be measured .. Leads may be

connected in either direction. Read AC voltage on the appro-

priate scale. Be sure to take the setting of the V-D.-A slide

switch into account, as described in the DC VOLTAGE MEA-

SUREMENTS section.

)

AC CURRENT MEASUREMENTS

AC current cannot be measured directly on this instrument.'

However, if you need an AC current measurement, measure the

voltage across a resistor in the circuit or across a small resistor

wired in series with the circuit. Calculate the cu rrent flowing

through this resistor, using Ohm's Law. See the procedure

and example under DC CURRENT MEASUREMENTS.

RESISTANCE (OHMS) MEASUREMENTS

Set the RANGE switch to an OHMS range and the V-D.-A slide

switch to V-D.-A. Bring one test lead into contact with the

other and set the OHMS ADJ. control for a full scale reward

of the meter pointer. Separate the test leads and connect them

across the resistor to be measured. Read the resistance on the

OHMS scale. Use the appropriate multiplier as required for the

different resistance ranges.

BATTERY CHECK

Set the range selector switch to the BAT. CHECK position Put

red

(f)

probe into BAT. jack and black

probe into

COM

jack. When you test 1.5V AA or AAA size battery, set slide

switch to "1.5V AA" position. When you test 1.5V C or D

size battery, set slide switch to "1.5V C, D" position. When

vou

test 9V transistor battery, set slide switch to "9V"

position. Connect red

probe tip to

terminal of the

battery and black

probe tip to

terminal of the battery

to be tested. Read position of the meter scale. If the reading is

in the red "BAD" zone, the battery should be replaced. If

the green "GOOD" zone the battery has considerable life.

lf reading is white

zone you should consider making a

replacement, since very little power is left.

CAUTION: Always be sure that you identify the battery

polarity correctly before testing the battery.

DECEIBEL RATIO MEASUREMENTS

The ratio of two AC voltages can be expressed in terms of

dB. A standard has been adopted wh ich establ ishes one refer-

ence voltage as the 0 dB level. It is 0.774 volt rms (root mean

square). This assumes that 1 milliwatt is. developed across an

impedance of 600 ohms.

When using the 10 ACV range, read the dB scale if the V-n-A

slide switch is set to V-A/2. For dB measurements on the other

NOTE: Adjust voltage with variac before measuring capacitance

or inductance. Transformer voltage and shunt resistor require-

ments are discussed in the text. Do not change variac voltage

after setting has been made.

.---

TRANSFORMER

l+r-

mil

10 VAC 120r12.5K SEE

OR OHMS OR TEXT

250 VAC 310K OHMS

110V

120V VARIAC SHUNT

AC RESISTOR

FIGURE 2

-10-

AC ranges when the V·n-A slide switch is in the V·A/2 position,

read the same dB scale but now add 14 dB when set to the

50V range, 28 dB when set to the 250V range, and 40 dB when

set to the 1000V range. When the V·n·A slide switch is in the

V-n-A position, read the same dB scale on the meter but now

add 6 dB in the 10V range, 20 dB in the 50V range, 34 dB in

the 250V range, and 46 dB in the 1000V range.

INDUCTANCE MEASUREMENTS

1. Wire the circuit shown in Fig. 2 using a power transformer

and variable AC supply voltage. Connect a 12- or 12.5-K

ohm resistor across the test leads. (Note: The 12- or 12.5-

K ohm resistor is used across the test leads when measuring

inductance and high capacitance. A 31(}Kohms resistor is

used across the test leads when measuring low capac itance.)

Any inductance between 4 and 2000 Henrys can be

measured.

2. Set the RANGE switch to 10 ACV and the V-n·A slide

switch to V-n-A. Connect the test leads across the secondary

of the transformer, as shown in Figure 2. Starting at zero

UNKNOWN INDUCTANCE ~

OR CAPACITANCE

TRANSFORMER

~II

LORC

120r12.5KOHMS

~ ~ ~1~KOHMS

120V VARIAC SHUNT

AC FIGURE 3 RESISTOR

Circuit to measure inductance or capacitance

- 11-

volts, slowly increasethe AC voltage until you read 10volts.

Do not change this voltage setting until you havecompleted

the measurementsin step 3. .

3. Connect the. unknown inductor (drawn asa rectangular box

marked L OR C) asshown in Figure 3. Note the voltage on

the 10 volt scale. UseTABLE 1 to determine the inductance

in the circuit from the voltage read on the meter. You can

interpolate between values if the actual voltage read on the

meter is not indicated on the table.

TABLE 1. VOLTAGE TO INDUCTANCE CONVERSION

(4 HENRYS TO 2000 HENRYS)

INDUCT· RMSVOLTS INDUCT·

RMS VOLTS ANCE (H) ANCE (H)

9.88 43.14 80

9.83 52.81 90

9.75 6256 100

9.67 7216 120

9.57 8 1.86 140

9.47 91.63 160

9.35 10 1.45 180

7.99 20 1.31 200

6.63 30 0.88 300

5.52 40 0.64 400

4.67 50 0.53 500

4.04 60 0.27 1000

3.52 70 0.13 2000

HIGH CAPACITANCE MEASUREMENTS

(.005 TO 1 MFD)

1. Connect the circuit shown in Figure 2, using a 12- or 12.5-

Kohms resistor.

2. Set the RANGE switch to 10 ACV, and the V-n-A slide

switch to v·n-A. Connect the test leadsacrossthe secondary

of the transformer. Starting at zero.volts, slowly increasethe

-13 -

AC voltage until you read 10 volts. Do not change this

voltage setting until you have completed the measurements

in step 3.

3. Connect the capacitor (drawn asa rectangular box marked L

OR C) as shown in Figure 3. Note the voltage on the 10volt

scale. Use TABLE 2 to determine the capacitance in the

circuit from the voltage read on the meter. You can inter-

polate between values if the actual voltage read from the

meter is not indicated on the table.

TABLE 2. VOLTAGE TO CAPACITANCE CONVERSION

(.005 MFD TO 1 MFD)

RMS VOLTS CAPAC

RMSVOLTS CAPACI-

TANCE (mtd) TANCE (rnfd)

.19 .005 4.67 .14

.32 .009 5.15 .16

.38 .01 5.61 .18

.73 .02 6.01

1.11 .03 6.86 .25

1.49 .04 7.49 .3

1.85 .05 8.34 .4

2.21 .06 8.83 .5

2.55 .07 9.14 .6

2.87 .08 9.35 .7

3.20 .09 9.50 .8

3.52 .1 9.58 .9

4.12 .12 9.67 1

LOW CAPACITANCE MEASUREMENTS

(100 TO 50,000 PF)

1. Connect the circuit shown in Figure 2, using a 310,000-

ohm resistor.

2. Set the RANGE switch to 250 ACV and the V-n-A slide

switch to V-n-A. Connect the test leadsacrossthe secondary

of the transformer. Starting at zero volts, slowly increase

the AC voltage until you read 250 volts. Do not change

the voltage setting until you have completed the measure-

ments in step 3.

3. Connect the capacitor (drawn as a rsctanqular box marked

L OR C) asshown in Figure 3. To avoid an electric shock,

disconnect the variable supply from the power source while

working in the circuit, but do not changethe voltage setting.

Note the voltage on the 250 volt scale. Use TABLE 3 to

determine the capacitance 'in the circuit from the voltage

read on the meter. You can interpolate between values if

the actual voltage read from the meter is not indicated on

the table.

TABLE 3. VOLTAGE TO CAPACITANCE CONVERSION

(.0001 MFD TO .05 MFD) (100 PF-50,OOOPF)

RMSVOLTS CAPACI- RMSVOLTS CAPACI-

TANCE (pF) TANCE (pF)

2.25 100 59 2600

4.5 200 64 2800

6.75 300 68 3000

9.25 400 78. 3500

11.8 500 88 4000

14 600 97.5 4500

16 700 106 5000

18.1 800 112 5500

21 900 124 6000

23.3 1000 130 6500

27.7 1200 137 7000

32.7 1400 151 8000

37 1600 161 9000

42 1800 172 10K

46.2 2000 221 20K

51 2200 236 30K

55 2400 245 50K

- 14-

SCHEMATIC DIAGRAM

OFF

250 125

r iooo

500

50 25 Al 5M

C10 5R2 1M VR2

187.5K 3K

V2.5 1.25

.25.125

56.25K

so, '] A20

5m 2.5m 15K

50m 25m

soo-

250m A8 0.48

LSAT. CHEC

A9 CAL.

1000 500

A250 125

C50 25

10 5

A13

90 96

A14

950

A15

17.7K

A16

o-----J

350K - 430K

~'I~-t--"

A28

L... __

l__-'9'-'V'--.J A25 18.75M 900

A17 110K

R23 A27 0.84

665K

A24 9.5

eCOM

lQOOV DC

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