Kusam-meco 2754A Manual de usuario

OPERATION

MANUAL

CLAMP-ON

MULTIMETER

2754A

2754A-T(TRUE RMS)

17, Bharat Industrial Estate, T. J. Road, Sewree (W),

Mumbai-400015. INDIA

Sales Direct: 24156638 Tel.:(022)2412 4540, 2418 1649 Fax:(022)2414 9659

E-mail : [email protected], Website : www.kusamelectrical.com

www.kusam-meco.co.in

Digital Multimeter

Digital AC & AC/DC Clampmeter

AC Clamp Adaptor

AC/DC Current Adaptor

Transistorised Electronic Analog & Digital

Insulation Resistance Testers

Digital Sound Level Meter & Sound Level

Calibrator

Digital contact & Non-contact Type

Tachometer

Digital Non-contact (infrared) Thermometer

Thermo Hygrometer

Thermo Anemometer

Wood Moisture Meter

Distance Meter

Digital Hand Held Temperature Indicators

Digital Lux Meter

Network Cable Tester

Power Factor Regulator

Maximum Demand Controller/Digital Power

Meter

LIST OF PRODUCTS

Nearly every electrical engineer has a hand held

digital clamp meter (Tongtester). We sometimes take

them for granted, until we damage them or “burn them

out”. If you incorrectly connect your clamp meter to a

circuit, or if you have the clamp meter on wrong setting,

you damage the meter and possibly hurt yourself. You

can also get into trouble if you try to measure the voltage

across a charged capacitor.

Clamp meter users frequently burn their meters by

trying to measure current the same way as they measure

voltage. Remember, you measure voltage across a

circuit, and current through a circuit. When you use the

current input, your clamp meter becomes a low

impedance circuit element.

Even if you correctly insert your clamp meter in to the

circuit, you can still damage your meter. Don’t try to

measure current in excess of your meter’s capacity.

Check the current capacity of the Clamp meter first.

If you are measuring current in industrial

environment, to prevent excess current from flowing

through your meter, always disconnect your test leads

from the circuit under test whenever you change Clamp

meter functions. Set your meter to the correct function,

say current, and its highest range for the setting. If the

reading is small, change the range to the next lower

range till the reading can be read with the best possible

accuracy. When measuring voltage, connect the test

leads before your apply power to your circuit. To be

safe, start by setting your meter to its highest range

first.

TAKE MEASUREMENT CAREFULLY AND YOU’LL

SPARE YOUR METER AND YOURSELF, SOME PAIN

CLAMP-ON

MULTIMETER

2754A

2754A-T(TRUE RMS)

TABLE OF CONTENTS

TITLE PAGE

Safety.......................................................1

Electrical Symbols................................... 3

SPECIFICATIONS

General Specifications............................ 4

Electrical Specifications.......................... 6

AC Voltage ...................................... 6

DC Voltage....................................... 6

Ohms................................................ 7

Diode Tester......................................8

Capacitance......................................8

DCA Current..................................... 8

ACA Current..................................... 9

Product Description................................. 10

Operation................................................ 11

Maintenance............................................ 17

Replacing the Battery.............................. 18

Test Certificate........................................ 19

Warranty.................................................. 20

1) SAFETY

This manual contains information and warnings that

must be followed for operating the instrument safely

and maintaining the instrument in a safe operating

condition. If the instrument is used in a manner not

specified by the manufacturer, the protection provided

by the instrument may be impaired.

The meter meets the requirements for double

insulation to IEC61010-2-032(2002), EN61010-2-

032(2002), UL61010B-2-032(2003):

Category III 600 Volts AC and DC.

PER IEC61010 OVERVOLTAGE INSTALLATION

CATEGORY

OVERVOLTAGE CATEGORY II

Equipment of OVERVOLTAGE CATEGORY II is

energy-consuming equipment to be supplied from the

fixed installation.

Note-Examples include household, office, and

laboratory appliances.

OVERVOLTAGE CATEGORY III

Equipment of OVERVOLTAGE CATEGORY III is

equipment in fixed installations.

Note - Examples include switches in the fixed

installation and some equipment for industrial use

with permanent connection to the fixed installation.

OVERVOLTAGE CATEGORY IV

Equipment of OVERVOLTAGE CATEGORY IV is for

use at the origin of the installation. Note - Examples

include electricity meters and primary over-current

protection equipment.

TERMS IN THIS MANUAL

Warning : Identifies conditions and actions

that could result in serious injury

or even death to the user.

Caution : Identifies conditions and actions

that could cause damage or

malfunction in the instrument

WARNING:

To reduce the risk of fire or electric shock, do not

expose this product to rain or moisture. The meter is

intended only for indoor use.

To avoid electrical shock hazard, observe the proper

safety precautions when working with voltages above

60 VDC or 30 VAC rms. These voltage levels pose a

potential shock hazard to the user.

Keep your hands/ fingers behind the hand/finger

barriers (of the meter and the test leads) that indicate

the limits of safe access of the hand-held part during

measurement. Inspect test leads, connectors, and

probes for damaged insulation or exposed metal

before using the instrument. If any defects are found,

replace them immediately.

This Clamp-on meter is designed to apply around or

remove from uninsulated hazardous live conductors.

But still, individual protective equipment must be used

if hazardous live parts in the installation where

measurement is to be carried out could be accessible.

CAUTION :

Disconnect the test leads from the test points before

changing meter functions.

2) CENELEC Directives

The instruments conform to CENELEC Low-

voltage directive 73/23/EEC and Electro

magnetic compatibility directive 89/336/EEC

Caution ! Risk of electric shock

Caution ! Refer to the explanation in this Manual

Application around and removal from

hazardous live conductors is permitted

INTERNATIONAL ELECTRICAL SYMBOLS

Display : 3¾ digits 4000 counts LCD display(s)

Update Rate : 3 per second nominal

Polarity : Automatic

Low Battery : Below approx. 2.4V

o o

Operating Temperature : 0 C to 40 C

Relative Humidity : Maximum relative humidity

80% for temperature up to 31 C decreasing linearly

to 50% relative humidity at 40 C

Altitude : Operating below 2000m

o o

Storage Temperature : -20 C to 60 C, < 80% R.H.

(With battery removed)

Temperature Coefficient : Nominal 0.15 X

o o o o o

(specified accuracy)/ C @(0 C-18 C or 28 C -40 C),

or otherwise specified

Sensing : Average sensing for Model 2754A; True

RMS for Model 2754A-T

Safety : Meets IEC61010-2-032(2002), EN61010-

2-032(2002), UL61010B-2-032(2003)

Category III 600 Volts AC & DC.

Transient protection : 6.5kV (1.2/50mS surge)

Pollution degree : 2

E.M.C. : Meets EN61326(1997, 1998/A1),

EN61000-4-2(1995), and EN61000-4-3(1996)

In an RF field of 3V/m:

Capacitance function is not specified

SPECIFICATIONS

GENERAL SPECIFICATIONS:

Other function ranges :

Total Accuracy = Specified Accuracy + 45 digits

Performance above 3V/m is not specified

Overload Protections:

Clamp-on jaws : DC 1000A or AC 800A rms

continuous + & COM terminals (all functions):

600VDC/VAC rms

Power Supply : Standard 1.5V AAA size battery X

2; or 1.5V AAA size alkaline battery X 2

Power Consumption : typical 11mA for ACA/DCA

and 2.9mA for other functions

APO Timing : Idle for 30 minutes

APO Consumption : typical 10mA for Model 2754A

& 190mA for Model 2754A-T

Dimension : 227(L) X 78(W) X 40(H)mm

Weight : 290gm approx

Jaw opening & Conductor diameter : 50mm max

Accessories : Test lead pair, batteries installed,

manual & soft carrying case.

Accuracy is ± (% reading digits + number of digits)

or otherwise specified, at 23°C ± 5°C and less than

75% R.H

400.0 mV

600 V

400.0 V

40.00 V

4.000 V

Range

0.3% + 3d

DC VOLTAGE

NMRR : >50dB @ 50/60Hz

Input Impedance : 10MW, 30pF nominal

(1000MWfor 400.0mV range)

CMRR : >120dB @ DC 50/60Hz, Rs =1kW

ELECTRICAL SPECIFICATIONS

True RMS Model 2754A-T ACV & ACA clamp-on

accuracies are specified from 5% to 100% of range or

otherwise specified. Maximum Crest Factor are as

specified below, and with frequency spectrums,

besides fundamentals, fall within the meter specified

AC bandwidth for non-sinusoidal waveofrms.

Accuracy Resolution

0.5% + 3d

1.0% + 4d

50Hz ~ 500Hz

4.000V

400.0mV

Range

AC VOLTAGE

Accuracy Resolution

4.0% + 4d

50Hz ~ 60Hz

40.00V 1.0% + 4d

400.0V

0.1 mV

1 V

0.1 V

0.01 V

0.001 V

0.1 mV

0.001 V

0.01 V

0.1 V

60Hz ~ 500Hz

4.000V

Range Accuracy Resolution

600V

2.0% + 4d

50Hz ~ 500Hz

40.00V 1.5% + 4d

400.0V

CMRR : >60dB @DC to 60Hz, Rs =1kW

Input Impedance : 10MW, 30pF nominal

True RMS Model 2754A-T Crest factor :

<1.6:1 at full scale & <3.2:1 at half scale

1)Selection by RANGE button manually, and is

specified from AC 40mV (AC 60mV for True RMS)

and up.

AC VOLTAGE

OHMS

400.0 W

4.000 MW

400.0 KW

40.00 KW

4.000 KW

Range

0.8% + 6d

Open Circuit Voltage : 0.4VDC typical

Accuracy Resolution

0.6% + 4d

1.0% + 4d

40.00 MW

2.0% + 4d

Audible Continuity Tester

Open Circuit Voltage : 0.4VDC typical

Range : 400.0W; Accuracy : 1.5% + 6d

Audible threshold : between 10Wand 120W.

0.001 V

0.01 V

0.1 V

1 V

0.1 W

1 KW

100 W

10 W

1 W

10 KW

CAPITANCE

500.0nF

3000mF

500.0mF

50.00mF

5.000mF

Range

1)Additional 50.00nF range accuracy is

not specified

2)Accuracies with film capacitor or better

3)Specified with battery voltage above 2.8V

(approximately half full battery). Accuracy

decreases gradually to 12% at low battery

warning voltage of approximately 2.4V

2)3)

Accuracy Resolution

3.5% + 6d

DCA CURRENT (Clamp-on)

1)Induced error from adjacent current-carrying

conductor : <0.01A/A

2)Relative Zero rmode is applied to offset the

non-zero residual readings, if any

400.0A

400A ~ 800A

0A ~ 400.0A

Range 1) 2)

Accuracy Resolution

1.5% + 4d

1000A

800A ~ 900A 2.0% + 4d

900A ~ 1000A 5.0% + 30d

1.5% + 4d

DIODE TESTER

< 1.6 VDC

Open Circuit Voltage Test Current (Typical)

0.4mA

0.1 nF

1 mF

0.1 mF

0.01 mF

0.001 mF

0.1 A

1 A

ACA CURRENT (Clamp-on)

1)Induced error from adjacent current-carrying

conductor : <0.01A/A

2)True RMS Model 2754A-T Crest Factor :

< 1.6:1 at full scale & < 3.2:1 at half scale

3)4.0% + 5d for True RMS Model 2754A-T

4)Accuracy is specified at <50A in this frequency

bandwidth due to limited calibrator output

capability for testing.

400.0A

15Hz~40Hz

Range 1) 2)

Accuracy Resolution

2.0% + 5d

15Hz~40Hz

@400A~600A

1000A

40Hz~100Hz

@400A~600A 1.5% + 4d

15Hz~60Hz

@600A~1000A 5.0% + 30d

2.0% + 5d

40Hz~200Hz

1.5% + 5d

200Hz~400Hz

@<50A

1.5% + 5d

2.0% + 5d

400Hz~1kHz

@<50A

1 A

PRODUCT DESCRIPTION

This user’s manual uses only representative model(S)

for illustrations. Please refer specification details for

function availability to each model.

1) Hall-effect

Clamp Jaw for AC

& DC current

electric field pick

up.

2) Hand/Finger

Barrier to indicate

the limits of safe

access of the

meter during

measurement.

3) Push-buttons for

special functions &

features.

4) Input Jack for all

functions EXCEPT

no-invasive ACA &

D C A c u r r e n t

functions

5) Common (Ground reference) Input Jack for all

functions EXCEPT non-invasive ACA & DCA

current functions

6) Slide-switch Selector to turn the power ON/OFF

And Select a function

7) 3¾ digits 4000 counts LCD display

8) Jaw trigger for opening the clamp jaw

9) Jaw center Indicators, at where best ACA & DCA

accuracy is specified.

DC Voltage and AC Voltage functions

Inputs are made through the test lead

terminals.

Note : DC 400.0mV range is designed with

1000MWhigh input impedance for least current

drain in measuring small signals, and can cope

better with most commercially available voltage

output transducers/adapters. The non-zero

display reading is normal when the meter

inputs are open circuit, which will not affect

actual measurement accuracy.

OPERATION

Inputs are made through the clamp jaws for non-

invasive ACA & DCA current measurements.

The meter will show a close to zero reading when the

inputs are shorted. Open input is actually a floating

condition, which is not a zero-volt-input condition.

Note : AC 400.0mV range selection is by RANGE

button manually, and is specified from AC 40mV &

up for Model 2754A and from AC 60mV & up for

True RMS Model 2754A-T.

ACA & DCA CURRENT CLAMP-ON FUNCTION

CAUTION

(Application and removal of the Clamp-on meter)

Press the jaw trigger and clamp the jaws around only

one single conductor of a circuit for load current

measurement. Make sure the jaws are completely

closed, or else it will introduce measurement errors.

Enclosing more than one conductor of a circuit will

result in differential current (like identifying leakage

current) measurement. Locate the conductor(s) at

the jaws center as much as possible to get the best

measuring accuracy. The jaw arrow-mark indicates

current flow direction on DCA positive readings. For

removal, press the jaw trigger and remove the jaws

from the conductor(s).

Note : In DCA measurements, hysteresis of the jaws

(after measuring high DC currents) may introduce

non-zero residual readings. Relative Zero rmode

should be used to offset the residual readings, if any,

so as to get more accurate measurements.

Adjacent current-carrying devices such as

transformers, motors and conductor wires will affect

measurement accuracy. Keep the jaws away from

them as much as possible to minimize influence.

Using Resistance, Continuity or Diode function in a

live circuit will produce false results and may damage

the instrument. In many cases the suspected

component must be disconnected from the circuit to

obtain an accurate measurement reading.

Inputs are made through the test leads terminals.

Slide-switch on defaults at W. Press SELECT

button momentarily to select Continuity function

which is convenient for checking wiring connections

and operation of switches. A continuous beep tone

indicates a complete wire.

WRESISTANCE AND CONTINUITY

FUNCTIONS

CAUTION

Inputs are made through the test leads terminals.

Slide-switch on defaults at W. Press SELECT button

momentarily 2 times to select Diode test function.

Normal forward voltage drop (forward biased) for a

good silicon diode is between 0.400V to 0.900V. A

reading higher than that indicates a leaky diode

(defective). Azero reading indicates a shorted diode

DIODE TEST FUNCTION

(Defective). An OL indicates an open diode

(defective). Reverse the test leads connections

(reverse biased) across the diode. The digital display

shows OL if the diode is good. Any other readings

indicate the diode is resistive or shorted (defective).

CAPACITANCE FUNCTION

Inputs are made through the test leads terminals.

Slide-switch on defaults at W. Press SELECT button

momentarily 3 times to select Capacitance

function. Relative zero rmode can be used to zero

out the parasitic capacitance of the leads and the

internal protection circuitry of the meter when

measuring low capacitance in the order of Pico Farad

(pF).

CAUTION

Discharge capacitors before making any

measurement. Large value capacitors should be

discharged through an appropriate resistance load.

HOLD

The Hold feature freezes the display for later viewing.

Press the HOLD button momentarily to toggle to

the Hold feature. The annunciator “ ” turns on.

MAX

The max feature compares and displays the

measured maximum value as fast as 30ms with auto-

ranging capability. It allows the meter to capture in-

rush currents in current functions. Press and hold the

MAX button for 1 second or more to toggle to the

max feature. The annunciators “MAX” and “ ”

turn on.

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