Major tech MT474 Manual de usuario

INSTRUCTION MANUAL

690V VOLTAGE TESTER

MT474

Contents Page no

1. Safety Warnings................................................................................4

1.1. International Safety Warnings...................................................4

1.2. Safety Notes............................................................................4

1.3. Warnings................................................................................4

2. Specifications....................................................................................6

3. Voltage Tester Description..................................................................7

4. Explanation of Symbols......................................................................7

5. Operation.........................................................................................8

5.1. Function Test / Self Test............................................................8

5.2. Voltage Test............................................................................8

5.3. Low Impedance Test................................................................8

5.4. Single-pole Phase Test..............................................................8

5.5. Voltage Test with RCD Trip Test..................................................9

5.6. Continuity Test/Diode Test........................................................9

5.7. Rotary Field Indication............................................................10

5.8. Measurement Point Illumination..............................................10

5.9. Maintenance.........................................................................11

5.10. Cleaning...............................................................................11

5.11. Calibration Interval.................................................................11

5.12. Battery Replacement..............................................................11

1. SAFETY WARNINGS

1.1. International Safety Symbols

Warning of a potential danger, comply with instruction manual.

Caution! Dangerous voltage. Danger of electrical shock.

Double insulation.

1.2. Safety Notes

• Reference. Please use utmost attention.

• Do not exceed the maximum allowable input range of any function

• Insulated personnel body protective equipment up to 690V.

1.3. Warnings

In order to avoid electrical shock, the valid safety and VDE regulations

regarding excessive contact voltages must receive utmost attention,

when working with voltages exceeding 120V (60V) DC or 50V (25V)

RMS AC. The values in brackets are valid for limited ranges (as for

example medicine and agriculture).

Prior to measurement ensure that the test leads and the test

instrument are in perfect condition.

When using this instrument only the handles of the probes may be

touched – do not touch the probe tips.

This instrument may only be used within the ranges specified and

within low voltage systems up to 690V.

Prior to usage ensure perfect instrument function (e.g. on known

voltage source).

The voltage testers may no longer be used if one or several functions

fail or if no functionality is indicated.

Do not use this instrument under damp conditions.

Perfect display is only guaranteed within a temperature range of -10°C

up to +55°C, at relative humidity question <85%.

If the operator's safety cannot be guaranteed, the instrument must be

removed from service and protected against use.

The safety can no longer be insured if the instrument:

ŸShows obvious damage

ŸDoes not carry out the desired measurements

ŸHas been stored for too long under unfavorable conditions

ŸHas been subjected to mechanical stress during transport.

All relevant statutory regulations must be adhered to when using this

instrument.

Appropriate Usage

The instrument may only be used under those conditions and for those

purposes for which it was designed. For this reason, in particular the

safety references, the technical data including environmental conditions

and the usage in dry environments must be followed.

When modifying or changing the instrument, the operational safety is no

longer ensured. The instrument may only be opened by an authorized

service technician, e.g. for repair.

LED voltage range 12, 24, 36 ,50, 120, 230, 400, 690V AC/DC

LED resolution ±12, 24, 36, 50, 120, 230, 400, 690V AC/DC

Tolerances -30% to 0% of reading

Voltage detection automatic

Acoustic signal (AC voltage) yes

Polarity detection full range

Range detection automatic

Response time < 0.1s LED

ACV Frequency range 50/60Hz

Automatic load (RCD) yes

Internal basic load approx. 2.1W at 690V

Peak current 1s <0.2A / Is (5s) < 3.5mA

Operation time ED =30s

Recovery time 10 min

LED on About 4.5V AC/DC

Single-pole Phase Test

Voltage range 100…690V AC

ACV Frequency range 50/60Hz

Continuity Test

Resistance range <400kΩ

Test current 5μA

Overvoltage protection 400V AC/DC, 690VDC

Rotary Field Indication

Voltage range (LEDs) 100…690V

Frequency range 50/60Hz

Measurement principle double-pole and contact electrode

Low impedance test

Voltage range 6….690V AC/DC

Low impedance <200kΩ

Operation time 5s@<230V AC/DC, 3s@< 400, 690V AC/DC

Overvoltage protection 400, 690V AC/DC <5s

Power supply 2 x 1.5V "AAA" Batteries

Power consumption max. 30mA / approx. 250mW

Temperature range -10°C up to +55°C

Humidity max. 85% relative humidity

Overvoltage class CAT III - 690V

Function Range

2. SPECIFICATIONS

3. VOLTAGE TESTER DESCRIPTION

1 - Handle test probe - (L1)

2 - lnstrument test probe + (L2)

3 - Measurement point illumination

4 - LEDs for voltage display

5 - LED for single-pole phase test

6 - LED for low impedance test

7 - LED for left/right rotary field

8 - LED for continuity

9 - Low impedance switch (L2)

10 - Measurement point lighting

Button

11 - Battery case

12 - Low impedance switch (L1)

4. EXPLANATION OF SYMBOLS

DC voltage

AC voltage

DC voltage negative potential (DC)

Phase display from 100 to 690V - 50/60Hz when used as a

"single-pole" phase tester.

Continuity test symbol

Rotating field display clockwise

Rotating field display anticlockwise

Device for work to be performed with voltage present

Battery replacement symbol

The voltage tester shows the following symbols:

5. OPERATION

5.1. Function test / Self test

Ÿ Test the voltage tester on a known source.

Ÿ Connect test probes. An acoustic sound must be audible and the LED

(8) must be illuminated.

Ÿ The voltage display of the instruments also functions when using

discharged or no batteries.

Ÿ The voltage testers may no longer be used if one or several functions

fails or if no functional reliability can be detected.

Ÿ The instruments are equipped with an internal load enabling the tripping

of an RCD protection device of 10mA or 30mA.

Ÿ For voltage tests (L towards PE) in systems with RCD devices, the RCD

may be triggered. To avoid RCD tripping first test between L and N

(approx. 5s). Immediately afterwards testing L towards PE can be

carried out without RCD tripping.

5.2. Voltage Test

Ÿ Connect both test probes with power source.

Ÿ As from a voltage of >6V the voltage tester switches on automatically.

Ÿ The voltage is displayed via LEDs.

Ÿ For AC voltages the "+" and "-" LEDs are illuminated and an additional

signal sound is audible.

Ÿ For negative voltages the " " and "-" LEDs are illuminated and an

additional signal sound is audible.

Ÿ The instruments are equipped with an LED row comprising: ±12, 24, 36,

50, 120, 230, 400, 690V AC/DC for DC voltage, the polarity of the

voltage displayed refers to the instrument test probe (+).

Ÿ Due to technical reasons the instrument cannot effectuate an automatic

switch-on for DC voltages within the range of approx. 0V to –/+4.5V.

5.3. Low impedance Test

Without pressing both low impedance buttons, the following voltage steps

(AC or DC) can be indicated: ±24, 36, 50, 120, 230, 400, 690V AC/DC. By

pressing both low impedance push buttons the voltage tester switches to

a lower internal resistance (suppression of inductive and capacitive

voltages). Thus, the indication of low impedance (6) is also activated. The

duration of the test with a lower internal resistance of the device (load

test) depends on the value of the voltage to be measured. To prevent

excessive warming of the voltage tester, it is equipped with a thermal

protection.

5.4. Single-pole phase Test

Ÿ The single-pole phase test is only possible when batteries are installed

and in good condition.

Ÿ The single-pole phase test starts at an AC voltage of approx. 100V (pole

>100V AC).

Ÿ When using single-pole phase tests to determine external conductors

the display function may be impaired under certain conditions (e.g. for

insulating body protective equipment on insulation locations).

Ÿ The single-pole phase testing is not appropriate to determine whether a

line is live or not. For this purpose, the double-pole voltage test is

always required.

Ÿ Connect both test probes with power source.

Ÿ A signal sound indicates the phase.

Ÿ The LED (5) is illuminated in the display.

5.5. Voltage Test with RCD Trip Test

During voltage tests in systems equipped with RCD circuit breakers, a

RCD switch can be tripped at a nominal residual current of 10mA or 30mA

by measuring the voltage between L and PE.

To avoid RCD tripping a test has to be carried out between L and N during

approx. 5s. Immediately afterwards, voltage testing between L and PE

can be carried out without RCD tripping.

5.6. Continuity Test / Diode Test

The continuity test /diode test is only possible when batteries are installed

and in good condition. A signal sound is audible for continuity and the

LED for continuity LED (8) is illuminated.

1010

5.7. Rotary Field Indication

The voltage testers are equipped with a double-pole rotary field indicator.

The rotary phase indication is always active. The symbols "R " or " L" are

always displayed. However, the rotary direction can only be determined

within a three-phase system. Here, the instrument indicates the voltage

between two external conductors.

Ÿ Connect the instrument test probe with the supposed phase L2 and the

handle test probe with the supposed phase L1.

The voltage and the rotary field direction are displayed.

"R" signifies that the supposed phase L1 is the actual phase L1 and the

supposed phase L2 is the actual phase L2.

"L" signifies that the supposed phase L1 is the actual phase L2 and the

supposed phase L2 is the actual phase L1.

When re-testing with exchanged test probes the opposite symbol has to

be illuminated.

5.8. Measurement Point Illumination

Voltage testers are equipped with a measurement point illumination

feature. Thus, working under bad lighting conditions (e.g. division switch

cabinets) is made easier. Press button for measurement point illumination

(10) on instrument rear.

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