Actron CP7848 Instructions d'exploitation télécharger pdf

10. If excessive voltage or current is accidentally applied

on a certain range, disconnect the leads from the circuit

as quickly as possible. Check the tester operation on that

range by applying an appropriate input. If the tester does

not operate properly, check the fuse; if it is blown, re

place it. (See Fuse Replacement)

OPERATING PROCEDURES

DC VOLTAGE MEASUREMENT

1. Read all SAFETY PRECAUTIONS.

2. Set the function range switch to the appropriate DC volt

age range. If the voltage is unknown, use the highest

range.

3. Insert the BLACK test lead into the ( ) negative jack and

the RED test lead into the ( ) positive jack.

4. If the polarity of the circuit to be tested is known, con

nect the BLACK probe to the ( ) negative voltage side of

the circuit, and the RED probe to the ( ) positive voltage

side.

5. If the polarity of the circuit to be tested is not known,

connect the probes to opposite sides of the circuit and

watch the meter pointer. If the meter pointer deflects to

the left, reverse the probes. The RED probe will now be

connected to the ( ) positive voltage side.

6. Use the black scale for reading DC voltage measure

ments.

DC CURRENT MEASUREMENT

1. Read all SAFETY PRECAUTIONS.

2. Set the function range switch to the appropriate DC mA

range. If the current is unknown, use the highest range.

3. Insert the BLACK test lead into the ( ) negative jack, and

the RED test lead into the ( ) positive jack.

4. Using the test leads, connect the tester in series with

the circuit under test. If the meter pointer deflects to the

left, reverse the test probes.

5. Use the black scale for reading DC mA measurements.

AC VOLTAGE MEASUREMENT

1. Read all SAFETY PRECAUTIONS.

2. Set the function range switch to the appropriate AC volt

age range. If the voltage is unknown, use the highest

range.

3. Insert the BLACK test lead into the ( ) negative jack and

the RED test lead into the ( ) positive jack.

4. Connect the RED and BLACK test probes to opposite

sides of the AC voltage source. (Polarity of test probes

is unimportant on AC voltage.)

5. Use the red scale for 10V and 1000V AC voltage mea

surements. Use the black scale for 50V and 250V AC

voltage measurements.

DECIBEL

1. Read all SAFETY PRECAUTIONS.

2. Insert the BLACK test lead into the ( ) negative jack, and

the RED test lead into the ( ) positive jack.

3. Set the function range switch to the appropriate AC volt

age range for the dB range you wish to measure.

4. For a function range switch setting of 10 AC V, read the

dB directly from the bottom of the red scale in dB. For

other AC V settings of the function range switch, add

the appropriate number of dB to the dB scale reading as

noted on the chart at the lower right corner of the meter

face.

RESISTANCE MEASUREMENT

1. Read all SAFETY PRECAUTIONS.

2. Turn off all power in circuit before making resistance

measurements.

3. Set the function range switch to the appropriate OHM

range. If the resistance is unknown, use the highest

range.

4. Insert the BLACK test lead into the ( ) negative jack, and

the RED test lead into the ( ) positive jack.

5. Touch the ends of the two test leads together. Rotate the

Zero Adjuster thumbwheel located on the left side of the

tester until the pointer indicates Zero on the green ohms

scale. If the pointer cannot be brought to the Zero mark,

replace the 1.5 volt size AA cell battery. (See Battery

Replacement)

6. Connect the test probes across the resistance to be

measured.

Instrucciones en

Español e Inglés

OPERATING INSTRUCTIONS

POCKET ELECTRICAL

TESTER

CP7848

100

150

200

250

-20

+12

+18

+16

+20

+22

60%

70%

BAT

110%

100

200

10K

AC V

RANGE

ADD

250

1000

DC 10000 / V

AC 40000 / V

•

•m

0dB:

1mW

600

1000 1000

250

50 50

2.5

X1K

X10

1.5V

DC V AC V

OFF

BAT

OHM

DCmA

FUSE & DIODE

PROTECTION

CP7848

Positive ( ) jack: Plug in connector located at the lower

right corner of the tester. The RED or positive( ) test lead

is always inserted in this jack.

Power supply: One 1.5V, size AA cell battery for Ohm

meter.

Size & Weight: 5 3/4 x 2 1/2 x 1 1/4 , 136g.

SAFETY PRECAUTIONS

1. Always visually inspect the tester, test leads, and circuit

under test for damage prior to every use.

2. Turn off power and discharge any capacitors and induc

tors prior to connecting or removing test leads from an

electrical circuit or electronic equipment.

3. Always keep yourself isolated from an electrical circuit

when making measurements. When possible use one

hand to make measurements.

4. Never allow yourself to be grounded when making elec

trical measurements. Stand on a rubber mat, wear dry

clothing, use insulated test probes, and be careful of all

exposed metal when making electrical measurements.

5. Never hold tester when making electrical measurements.

Place the tester on a clean insulated surface before mak

ing any electrical measurements.

OPERATING INSTRUCTIONS

CAUTION ! When making voltage or current measure

ments, form the habit of turning off all power to the cir

cuit under test, and discharge any capacitors and induc

tors. Connect the test leads at the desired points in the

circuit and then turn on the power while taking readings.

Turn off the power and discharge any capacitors and in

ductors, before disconnecting the test leads from the cir

cuit.

PRELIMINARY ADJUSTMENTS

Adjust the meter pointer to the Zero mark at the left side of

the black scale before making any measurements. First,

check to see if the meter pointer indicates Zero at the ex

treme left end of the black scale. If it is off Zero, use a

small screwdriver to turn the mechanical adjuster screw

on the meter movement slowly CW (clockwise) or CCW

(counterclockwise) until the meter pointer is exactly over

the Zero mark.

INTERNAL BATTERY CHECK

Important: A 1.5V AA cell battery must be installed

before using the CP7848. (See Battery Replacement)

In order to check the battery condition, insert the black test

lead into the ( ) negative jack, and insert the red test lead

into the ( ) positive jack. Set the function range switch to

the OHM X10 position and touch the ends of the two test

leads together. Rotate the Zero Adjuster thumbwheel lo

cated on the left side of the tester until the pointer indi

cates Zero on the green ohms scale. If the pointer cannot

be brought to the Zero mark, replace the 1.5 volt size AA

cell battery. (See Battery Replacement)

OPERATING SUGGESTIONS

1. Set the range switch to the proper position before tak

ing any measurement.

2. Never apply more voltage or current than the amount

noted in each position.

3. When the voltage or current to be measured is not known,

always start with the highest range in each case.

4. If the meter pointer is in the lower half of the scale and

falls within the range of a lower function range switch

position, then rotate the function range switch to the

lower range for greatest accuracy.

5. If none of the tester functions work at all, check the fuse

located inside the tester on the printed circuit board. If

the fuse is blown, replace it. (See Fuse Replacement)

6. Avoid placing the tester in a place where severe vibra

tion is encountered; Do not store it in excessively hot or

damp places!

7. Do not check resistance when voltage or current is

present in the circuit.

8. Discharge a capacitor before measuring it.

9. When the tester is not in use, keep the function range

switch in the OFF position. This provides a direct short

across the meter movement, stabilizing the needle for

minimum needle bounce when transporting the tester.

7. Take a reading on the green Ω scale and multiply it by

the multiplication factor indicated by the function range

switch. Multiply reading by 1K (1000Ω) for the OHM 1K

position and, by 10 for the OHM 10 switch position. The

units for the OHM 10 position are ohms Ω .

8. If there is little or no meter pointer movement from the

left side of the green Ω scale, rotate the function range

switch to a higher range in an effort to get a greater de

flection of the meter pointer. The most accurate reading

on an ohmmeter ranges between the middle of the scale

and Zero ohms.

BATTERY CHECK

1. Read all SAFETY PRECAUTIONS.

2. Set the selector switch to the appropriate BAT range.

3. Insert the BLACK test lead into the ( ) negative jack, and

the RED test lead into the ( ) positive jack.

4. Touch and hold the RED test lead to the ( ) positive bat

tery terminal and the BLACK test lead to the ( ) negative

battery terminal.

5. Read the BAT scale to determine the battery condition.

If the reading is in the red REPLACE zone, the battery

should be replaced. If the reading is in the green GOOD

zone, the battery has considerable life left. If the reading

is in the ? zone, the battery should be replaced soon

because the remaining power is very low.

MAINTENANCE

GENERAL

1. No periodic maintenance is required other than replace

ment of the battery, fuse, and visual inspection of the

tester.

2. Keep the instrument clean and dry. Do not use solvent

for cleaning; use a damp cloth.

3. The only field replaceable parts are the 1.5V AA cell

battery and the Fast Acting 5mm X 20mm, 0.315A, 250V

fuse.

BATTERY REPLACEMENT

Important: A 1.5V AA cell battery must be installed

before using the CP7848.

1. Rotate the function range switch to the OFF position.

2. Remove red and black test leads from the test lead jacks.

3. Remove screw from rear of tester, and lift off the back

cover.

4. Install a new 1.5V AA cell battery. Observe the polarity

marks as indicated on the bottom of the battery com

partment.

5. Carefully replace the back cover and tighten the screw.

Be careful not to over tighten the screw, because the

threads in the case may become stripped.

FUSE REPLACEMENT

Important: If the tester won t work at all, check the fuse

located inside the tester. If the fuse is blown, all tester func

tions fail to work.

1. Rotate the function range switch to the OFF position.

2. Remove red and black test leads from the test lead jacks.

3. Remove screw from rear of tester, and lift off the back

cover.

4. Replace blown fuse with a new Fast Acting 5mm X

20mm, 0.315A, 250V fuse.

5. Carefully replace the back cover and tighten the screw.

Be careful not to over tighten the screw, because the

threads in the case may become stripped.

GENERAL DESCRIPTION

The CP7848 Pocket Analog Tester is a rugged, accurate,

easy to operate, compact instrument. The stable linear

meter movement of the tester allow it to make accurate

measurements of AC and DC voltages, DC currents in the

milliamp range, resistance, and decibels. The tester uses

the most modern components and circuit techniques de

signed in a high impact case. If the tester is kept clean and

is not subjected to extreme shock or continuous vibration,

it will provide many years of trouble free service.

SPECIFICATIONS

ELECTRICAL

Range: 18 measuring ranges

DC voltage: 0 2.5 50 250 1000 volts

AC voltage: 0 10 50 250 1000 volts

DC current: 0 10 250 mA

Resistance: OHM X10, OHM X1K

Decibel: 20dB to 62dB at AC volt ranges

Accuracies:

DC V/A 4% Full Scale, AC V 5% Full Scale

Resistance: 4 Arc of scale length

Sensitivity: 10,000 Ohms/VDC, 4,000 Ohms/VAC

BAT test: 1.5V, or 9V batteries

PHYSICAL

Function range switch: A 14 position switch located at the

center of the tester. This switch is used to select the func

tion and range to be measured.

Zero Adjuster: A thumbwheel adjustment located on the

left side of the tester. The zero adjuster is used to zero the

meter pointer when making resistance measurements.

Mechanical adjuster: A screw located directly below the

center of the meter scale. The mechanical adjuster is used

to set the meter pointer to the Zero mark at the left side of

the black scale.

Negative ( ) jack: Plug in connector located at the lower

left corner of the tester. The BLACK or negative( ) test lead

is always inserted in this jack.

0002-012-2172

1 2

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Page 1 - POCKET ELECTRICAL

10. If excessive voltage or current is accidentally appliedon a certain range, disconnect the leads from the circuitas quickly as pos

Page 2 - BOLSILLO

INSTRUCCIONES DE OPERACIONPRECAUCION! Adopte el h bito de desconectar toda lapotencia al circuito a prueba y descargar todos loscondens

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Actron CP7848 Instructions d'exploitation

Naviguer en ligne ou télécharger Instructions d'exploitation pour Multimètres Actron CP7848. Actron CP7848 Operating Instructions Manuel d'utilisatio

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