B+K precision 881 Manuale utente

INSTRUCTION MANUAL

MANUAL DE INSTRUCCIÓNES

In-Circuit ESR & DCR Cap Tester

Model 881

MEDIDOR DE RESISTENCIA ESR&DSR DE

CAPACITORES

MODELO 881

SAFETY GUIDELINES

WARNING

An electrical current of over 10 milliamps passing through the heart

will stop most human hearts. Voltage of as low as 35 Volts dc or ac

rms should be considered hazardous since it can produce lethal

current under certain conditions. Be sure to observe the following

safety precautions:

1. There are no high voltages in the Cap Tester, but the equipment

under test usually contains hazardous high voltage. Always follow

the safety recommendations of the manufacturer of your

equipment.

2. Some equipment may be wired as a "hot chassis" type; equipment

using two-wire power plugs are always suspect and it may even

include those with polarized plugs. Never touch chassis of "hot

chassis" type equipment to avoid the possibility of a serious,

possibly fatal electrical shock.

3. Don't expose yourself needlessly to high voltage; only remove

housings and covers when necessary.

4. Familiarize yourself with the equipment being tested and the

location of its high voltage points. However be aware that high

voltage may appear at unexpected points in defective equipment.

5. Never work alone. Someone should be nearby to render aid if

needed. Training in CPR (Cardio-pulmonary resuscitation) is

highly recommended.

SPECIFICATIONS

Specifications

Open circuit probe voltage 15mV pp (typical)

Output test frequency 100 KHz sine wave (typical)

Measures ESR

ESR range ohms 0.1 –30

(25 segment LED bar scale) Beeps from 1 to 5 beeps depending on

ESR of capacitor

Measures DCR

DCR range ohms 0.5 - 30 flashing

the LED

Power One 9V battery or

an external AC

adapter (9V DC

150mA 5.5mm x

2.1 mm center

pin+)

Power drain 10mA typical

Dimensions 2.1" x 3.6" x 6.0"

NOTE: Specifications and information are subject to change without

notice. Please visit www.bkprecision.com for the most current product

information.

CONTROLS AND INDICATORS

1. Power Switch - Power on or off

2. DCR Low Indicator - LED turns on when DCR low

3. Mode switch - Selects test modes "ESR" or

"DCR&ESR"

4. ESR or DCR Indicator - Indicate the ESR or DCR

5. Colored chart - The three-colored chart that show typical ESR

readings of good, fair, and bad capacitors depending

on their capacitance.

6. Square connector - Capacitance

7. Bat Low - Indicates battery condition.

8. AC Adapter Jack - 9V DC, 100mA center pin + adapter

input.

8 7

In-Circuit ESR & DCR Capacitor Tester

MODEL 881

INTRODUCTION:

The In-circuit ESR & DCR capacitor tester is specially designed to

measure ESR (equivalent Series Resistance) on capacitors in the range of

0.47uf and up, in or out of circuit. The output test frequency of the meter

is a 100KHz SINE WAVE. The output voltage is 15mV pp and will not

turn on any solid state devices in the circuit under test.

It includes a one-handed tweezers test probe, microprocessor controlled,

automatically discharges the capacitors under test, checks for low DCR,

checks and displays ESR on a 25 segment LED bar scale, and beeps from

one to five beeps depending on the ESR reading of the capacitor. It has a

three-colored chart on the front panel that show typical ESR readings of

good, fair, and bad capacitors depending on their capacitance.

OPERATION:

1. Place the mode switch to the position for measurement.

2. Turn the unit on and wait for it to beep once to indicate it is ready.

3. Hold the tweezers’ test probe cross the capacitor leads to measure

ESR of the capacitor

4. Read the ESR of the capacitor according to the LED bar scale and

three-colored chart.

APPLICATIONS:

Using the tester to measure electrolytic capacitors in or out of circuit,

When the meter is turned on, it will automatically calibrate the internal circuit,

and then it will beep once to indicate it's ready. (Note: Before the unit beeps to

signal it is ready, don't have the tweezers’ test probes shorted together or

connected to a capacitor, otherwise the meter will continue to sound an alarm

until the test probe is opened or the capacitor is removed.)

The meter has two modes for performing in-circuit ESR measurements ("DCR

& ESR" mode and "ESR" mode). Place the mode switch to the position for

measurement.

To measure the ESR on a capacitor, hold the tweezers’ test probe cross the

capacitor leads. The meter's probes are nonpolar.

On the "ESR" mode, the meter performs a set cycle of tests each time it is

connected to a capacitor. First it discharges the capacitor, then it measures the

ESR and indicates the range of the value with the 25 LED bar, and also sounds

one or more times depending on the ESR of the capacitor (see table 1). The

three-color chart on the panel shows typical electrolytic capacitors ESR readings.

If the capacitor's ESR range is in the green areas, it is good, and if the capacitor's

ESR range is in the red areas, it must be replaced. If the capacitor's ESR range is

in the yellow areas it's questionable and is up to the technician to decide on

whether to replace this capacitor, or not. The capacitor with higher voltage

ratings and used in circuits not requiring particularly low ESR may still work

adequately in the yellow area. However, the modem solid circuits such as switch

power supplies require low ESR capacitor. The ESR of a good capacitor depends

upon the type of material, value and voltage rating.

On the "ESR" mode, the meter will indicate that a shorted capacitor is good

because the meter does not perform the DCR measurement. Therefore, only in

the "OCR & ESR mode" will the meter detect shorted capacitor in its DCR cycle.

Table 1

On the "DCR & ESR" mode, first it discharges the capacitor, then it checks the

DC resistance and if the DC resistance is less than 30 ohm, it will stop on the

DCR cycle, otherwise, it measures the ESR and indicates the range of the value

with the 25 LED bar. On this mode, the meter detects shorted capacitor in its

Beeps from 1 to 5 beeps depending on ESR

ESR range ohms: 0 - 0.552

0.5 -152

1 -. 352

3 - 852

8-3052

One sound

Two sounds

Three sounds

Four sounds

Five sounds

Beeps from 1 to 5 beeps depending on ESR

SR range ohms: 0 - 0.552 One sound

0.5 -152 Two sounds

1 -. 352 Three sounds

3 - 852 Four sounds

8 - 3 0 5 2 Five sounds

DCR cycle.

If the meter stops on the DCR cycle, it first sounds an alarm and turns on the

DCR LOW led, then indicates DC resistance by flashing the LED on the LED

bar and also sounds one or more times depending on the DC resistance (see table

2).

Table 2

The meter automatically discharges capacitors before testing. However, if

capacitors are large enough, and there is enough voltage stored, it may damage

the test probe. We recommend that for a large capacitor, you should discharge it

before you

test it.

You can use the "ESR" mode to test a capacitor with a parallel inductor if the

inductor has a large inductance at 100 kHz test frequency and have no affect on

the ESR reading. For example, there are motor, switch power supply transformer

and TV yoke windings etc.

On the "ESR" mode, the meter is an AC ohm meter, it can be used to measure

low value non-inductive resistors. It also may be used to measure small inductors

and compare meter reading to the known good inductors.

Measures DCR by flashing the LED on the LED bar

DCR range ohms: 0 - 0.5Ω flashing the 0.5ΩLED

0.5- 1.2Ω flashing the 1.2Ω LED

1.2 - 2.5Ω flashing the 2.5Ω LED

2.5 -4.5Ω flashingthe 4.5Ω LED

4.5 - 10Ω flashing the 10ΩLED

10 - 20Ω flashing the 20Ω LED

20- 30Ω flashing the 30Ω LED

Beeps from 1 to 3 beeps depending on DCR

DCR range ohms: 0 - 1.252 One sound

1.2 - 4.552Two sounds

4.5 - 3 052Three sounds

Beeps from 1 to 5 beeps depending on ESR

ESR range ohms: 0 - 0.552

0.5 -152

1 -. 352

3 - 852

8-3052

One sound

Two sounds

Three sounds

Four sounds

Five sounds

Limited One-Year Warranty

B&K Precision Corp. warrants to the original purchaser that its products

and the component parts thereof, will be free from defects in

workmanship and materials for a period of one year from date of

purchase.

B&K Precision Corp. will, without charge, repair or replace, at its

option, defective product or component parts. Returned product must be

accompanied by proof of the purchase date in the form of a sales

receipt.

To obtain warranty coverage in the U.S.A., this product must be

registered by completing a warranty registration form on

www.bkprecision.com within fifteen (15) days of purchase.

Exclusions: This warranty does not apply in the event of misuse or

abuse of the product or as a result of unauthorized alterations or

repairs. The warranty is void if the serial number is altered,

defaced or removed.

B&K Precision Corp. shall not be liable for any consequential damages,

including without limitation damages resulting from loss of use. Some

states do not allow limitations of incidental or consequential damages.

So the above limitation or exclusion may not apply to you.

This warranty gives you specific rights and you may have other rights,

which vary from state-to-state.

B&K Precision Corp.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

SERVICE INFORMATION

Warranty Service: Please return the product in the original packaging

with proof of purchase to the address below. Clearly state in writing the

performance problem and return any leads, probes, connectors and

accessories that you are using with the device.

Non-Warranty Service: Return the product in the original packaging

to the address below. Clearly state in writing the performance problem

and return any leads, probes, connectors and accessories that you are

using with the device. Customers not on open account must include

payment in the form of a money order or credit card. For the most

current repair charges please visit www.bkprecision.com and click on

“service/repair”.

Return all merchandise to B&K Precision Corp. with pre-paid shipping.

The flat-rate repair charge for Non-Warranty Service does not include

return shipping. Return shipping to locations in North American is

included for Warranty Service. For overnight shipments and non-North

American shipping fees please contact B&K Precision Corp.

B&K Precision Corp.

22820 Savi Ranch Parkway

Yorba Linda, CA 92887

www.bkprecision.com

714-921-9095

Include with the returned instrument your complete return

shipping address, contact name, phone number and description of

problem.

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