PCE Instruments LCT 1 Manuale utente

AC LEAKAGE Digital Multimeter

PCE-LCT 1

USER’S MANUAL

PCE Americas Inc.

711 Commerce Way

Suite 8

Jupiter

FL-33458

USA

From outside US: +1

Tel: (561) 320-9162

Fax: (561) 320-9176

[email protected]

www.pce-instruments.com/english

www.pce-instruments.com

PCE Instruments UK Ltd.

Units 12/13

Southpoint Business Park

Ensign way

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: (0) 2380 98703 0

Fax: (0) 2380 98703 9

[email protected]

TABLE OF CONTENTS

Ⅰ.Features…………………………………………………………………………1

Ⅱ.Panel Description………………………………………………………………2

Ⅲ.Operation lnstructions…………………………………………………………4

A.AC Leakage current Measurements………………………………………4

1.Leakage current Flowing into Ground Conductor……………………4

2.Out of Balance Leakage current…………………………………………5

3.Using the 50/60and Wide Selector………………………………………6

B.AC Load Current Measurement……………………………………………7

C.AC Voltage Measurements…………………………………………………7

D.Resistance and continuity Measurement…………………………………8

E. Relative Reading Measurements…………………………………………8

F. Holding the LCD Reading……………………………………………………8

G.Finding the MAX/MIN Value…………………………………………………8

H.Auto-Power-Off………………………………………………………………9

IV.Specifications……………………………………………………………………9

V. Battery Replacement…………………………………………………………10

Ⅰ.Features

1.Accurate AC digital clamp meter for leakage current measurement.

2.10μA high resolution on 40mA range.

3.Shield transformer jaws to minimizs the effect of external stray

magnetic field.

4.Large jaw with 30 mm diameter.

5.Five Ranges (40mA, 400mA,4A,40A,100A)for all application.

6.A filter circuit is designed to eliminate the effect of high frequency

noise and harmonics by setting the frequency selector switch at the

50/60 Hz position for AC current measurement.

7.Large 3 3/4 digits LCD

8.Fast bargraph display (20 times/sec.)for transient observation.

9.Continuity and frequency measurements.

10.Max/Min and Data Hold functions.

11.Relative Measurement.

12.600V overload protection for ohm measurement.

13.Easy single rotary switch for any function selection.

Ⅱ.Panel Description

1.Transformer Jaw

This is used to pick up current signal.To measure DC/AC current,

conductor must be enclosed by the jaw.

2.Transformer Trigger

This is used to open the jaw.

3.Function Selector Switch

This is used to select the function user desired, such as ACV ,ACA,ohm

and continuity.

4.Frequency Selection Switch

At 50/60Hz position,only the low frequency signal is measured.At wide

position,signal from 40-1KHZ is measured.

5.Data Hold Button

once this button is pushed,reading shall be held on the LCD. Press

again to release it.

6.Max/Min Hold Button

This button is used to enable the maximum or minimum value to be

displayed and updated during measurement. Press once, minimum

value shall be displayed and updated. press again, maximum value shall

be displayed and updated. Press again (the third push ),clamp meter

return to normal measurement mode.

7.Zero/Relative Button

once this button is pressed, the current reading shall be set to zero and

be used as a zero reference value for all other subsequent

measurement.

8.LCD

This is a 3 3/4 digit liquid crystal display with maximum indication off

3999. Function symbols, units, bargraph, sign, decimal points, low

battery symbols, Max/Min symbols, and zero symbol are included.

9.Low Battery Symbol

When this symbol appears, it means the battery voltage drops below the

minimum required voltage. Refer to Section V for battery replacement.

10.Zero/Relative Symbol

When this symbol appears, it means a reference value has been

subtracted from the actual reading. The reading shown is a offseted

value. Press and hold the zero button for 2 seconds to disable this

function.

11.Data Hold Symbol

Once the hold button is pressed, this symbol appears on LCD.

12.Bargraph

Bargraph has forty segments. It displays segments proportional to the

actual reading. Each segment represent one count.

13. Max/Min Hold symbol

Once the Max/Min button is pressed, either MAX or MIN shall be

displayed on LCD.

14.Continuity Symbol

If ohm and continuity function is selected, this symbol shall appears on

LCD.

15.Units symbols

Once a function is selected, corresponding unit (V,Ω, A，or Hz) shall be

displayed on LCD.

16.V ΩHz input Terminal

This terminal is used as input for voltage, ohm/continuity, or frequency

measurements.

17.COM Terminal

This terminal is used as common reference input.

18.Hand strap

Put your hand through the hole of hand strap to avoid accidental drop of

the clamp meter.

Ⅲ. Operation Instructions

A. AC Leakage Current Measurements

1. Leakage current Flowing into Ground conductor

WARNING: Make sure that all the test leads are disconnected from the

meter’s terminals for current measurement.

a.Set the rotary switch at desired range.

b.Press the trigger to open the jaw and fully encloes the wire goes to

the ground. Make sure the two half jaws are properly closed.

c.Read the measured value from the LCD display.

2. Out of Balance Leakage current

a. Set the rotary switch at desired range

b.Press the trigger to open the jaw and fully enclose all two wires

(single phase, two wires), three wires(three phases, three wires), or four

wires(three phases, four wires).Make sure the two half jaws are

properly closed.

c.Read the measured value from the LCD display.

3. Using the 50/60 and wide Selector

50/60 position

This clamp meter has very good frequency response due to the electric

property of the transformer jaws used. Therefore, the measurement

result contains not only the fundamental frequency of 50/60Hz but also

the high frequencies and harmonics superimposed on the fundamental

frequency. To eliminate the effect of high frequency noise, a low pass

filter is designed to filter out high frequency signal. To enable the filter,

set the switch at the 50/60 position. The filter’s cut-off frequency is set

at 100Hz with an attenuation characteristic of approx. 24dB/octave.

Wide position

If the circuit under test is originated from a high frequency generating

device such as inverter, switching regulators, etc., then the switch

should be set at wide position to measure the signal which contains the

frequency from 40Hz-1kHz.

To make sure the presence of high frequency signal, set the switch at

50/60 and wide position to see the difference. If the reading is very

different, it is certain that the high frequency signals or harmonics

present.

B.AC Load Current Measurement

LOAD CURRENT LEAKAGE CURRENT

a. Set the rotary switch at desired range.

b. Press the trigger to open the jaw and fully enclose only one wire. No air

gap is allowed between the two half jaws.

c. Read the measured value from the LCD display.

C.AC Voltage Measurements

WARNING: Maximum input for DC V is 600,and for AC V is 600. Do

not attempt to take any voltage measurement that exceeds the limits.

Exceeding the limits could cause electrical shock and damage to the

clamp meter.

a.Set the rotary switch at 400V

b.Insert the test leads into the input jack.

c.Connect the test prods of the test leads in PARALLEL to the circuit

to be measured.

d.Read the measured value from the LCD display.

D. Resistance and Continuity Measurement

1. Set the rotary switch at Ω

2. Insert the test leads into the input jack.

3. Connect the test prods of the test leads to the two ends of the

resistor or circuit to be measured.

4. Read the measured value from the LCD display.

5. If the resistance is lower than 40Ω, a beeping sound shall be

heard.

E.Relative Reading Measurements

The zero button also can be used to make a relative measurement. Once

the button is pushed, the current reading is set to zero and a zero

symbol shall be displayed on LCD. All the subsequent measurement

shall be displayed as a relative value with respect to the value being

zeroed. press the zero button for 2 seconds to return to normal mode.

F.Holding the LCD Reading

Press the HOLD button, then the reading shall be hold and kept on LCD.

G.Finding the MAX/MIN Value

Press the MAX/MIN button to enable the maximum and minimum values

to be recorded and updated during measurement. Push the button once,

the maximum value shall be displayed and updated. Push again

(second push ), the minimum value shall be displayed. Push again(third

push), MAX/MIN function shall be disabled and return to the normal

measurement mode.

WARNING: Before taking any in-circuit resistance measurement,

remove power from the circuit being tested and discharge all the

capacitors.

H. Auto-Power-Off

The meter will turn itself off 30 minutes after power-on. To turn it on

again, user can either press the HOLD button or turn the power off and

turn it on again. To disable the Auto-power-off function, hold the HOLD

button while turning on power.

IV.Specifications(23℃±5℃)

AC current:

Accuracy

Range

Resolution

50/60 Hz

Wide(400-1KHz)

40mA

10μA

±1.0%±0. 5mA

±4.5%±0. 5mA

400mA

100μA

±3.0%±5.0mA

1mA

±4.0%±0.1A

40A

10mA

±4.0%±1.0A

80A

100mA

±2.5%±1.0A

±3.0%±1.5A

80-100A1

100mA

±5.0%±1.0A

±5.0%±1.5A

1Though the meter can display up to 400A,it is not calibrated beyond 100A

AC Voltage( input impedance:10MΩ)

Overload

protection

Range

Resolution

50/60Hz

40-1KHz

400V

0.1V

±1.5%±2dgts

±2.0%±4dgts

AC 600V

Resistance (Ω) and continuity: (open voltage 0.4V)

Range

Resolution

Accuracy

Beeping

OL Protection

40-400Ω

0.1Ω

±1.0%±2dgts

<38.0Ω

AC 600V

Conductor size: 30mm max.(approx.)

Battery Type: One 9V NEDA 1604

Display: 3 3/4 LCD with 40seg. bargraph

Range Selection: manual

Overload indication: left most digit blinks

Power Consumption: 10mA(approx.)

Low battery indication:

Sampling Time: 2 times/sec.(display)

20 times/sec.(bargraph)

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