PCE Instruments PCE-IT55 Manuale utente

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DIGITAL INSULATION TESTER

INSTRUCTION MANUAL

SAFETY INFORMATION

Read the following safety information carefully before

attempting to operate or service the meter.

To avoid damages to the instrument do not apply the

signals which exceed the maximum limits shown in the

technical specifications tables.

Do not use the meter or test leads if they look damaged.

Use extreme caution when working around bare

conductors or bus bars.

Accidental contact with the conductor could result in

electric shock.

Use the meter only as specified in this manual;

otherwise, the protection provided by the meter may be

impaired.

Read the operating instructions before use and follow

all safety Information.

Caution when working with voltages above 60V DC or

30V AC RMS. Such voltages pose a shock hazard.

Before taking resistance measurements or testing

acoustic continuity, disconnect circuit from main power

supply and all loads from the circuit.

3 4

Safety symbols:

Caution refer to this manual before using the meter.

Dangerous voltages.

Meter is protected throughout by double insulation or

reinforced insulation.

When servicing, use only specified replacement parts.

CE Comply with EN-61010-1

1. SPECIFICATIONS

1-1 General Information

Environment conditions:

①

①①

①

Installation Categories II

②

②②

②

Pollution Degree 2

③

③③

③

Altitude up to 2000 meters

④

④④

④

Indoor use only

⑤

⑤⑤

⑤

Relatively humidity 80% max.

⑥

⑥⑥

⑥

Operation Ambient 0~40ºC

Maintenance & Clearing:

①

①①

①

Repairs or servicing not covered in this manual should

only be performed by qualified personnel.

②

②②

②

Periodically wipe the case with a dry cloth. Do not use

abrasives or solvents on this instruments.

Display: Large LCD with dual display

Measurement Range: 200Ω, 200kΩ, 200MΩ/250V,

200MΩ/500V, 2000MΩ/1000V,

750V/ACV, 1000V/DCV.

Sampling Rate: 2.5 times per second.

Zero Adjustment: Automatic adjustment.

Over Range Indicator: Number 1 of highest digit is

displayed.

Low Battery Indication: The is displayed when the

battery Voltage drop below the

operating voltage.

Operating Temperature: 0ºC to 40ºC (32ºF to 104ºF) and

Humidity below 80% RH

Storage Temperature: -10ºC to 60ºC (14ºF to 140ºF) and

Humidity below 70% RH

Power source: DC9V (6x1.5V Size “AA” battery or Equivalent)

Dimensions: 200(L) x 92(W) x 50(H) mm

Weight: Approx 700g include battery

Accessories: Test leads, 6pcs battery, Carrying case, manual.

5 6

1-2 Electrical Specifications

Accuracies are specified in the way:

±(…% of reading +…digits) at 23ºC±5ºC,below 80% RH.

OHMS

Range Resolution

Accuracy

Max. open

Circuit

Voltage

Overload

Protection

200Ω0.1Ω+(1%+2) 4.5V 250Vrms

200kΩ0.1kΩ3.0V

Continuity Beeper

Range Resolution

Operation

Resistance

Max.open

Circuit

Voltage

Overload

Protection

•))) 0.1

Ω

Resistance≤40

Ω

4.5V 250Vrms

Short circuit current ≤200mA

DC Voltage

Range Resolution Accuracy Input

Impedance

Overload

Protection

1000V 1V +(0.8%+3) 10MΩ1000Vrms

AC Voltage (40Hz~400Hz)

Range Resolution

Accuracy Input

Impedance

Overload

Protection

750V 1V +(1.2%+10)

10MΩ750Vrms

Meg OHMS

Range Resolution Accuracy Terminal Voltage

200M

Ω

/250V 0.1M

Ω

+(3%+5)

250V+10%~-0%

200M

Ω

/500V 0.1M

Ω

500V+10%~-0%

0~1000M

Ω

/1000V

Ω

1000V+10%~-0%

1000~2000M

Ω

/1000V

+(5%+5)

Range Test Current Short circuit current

200MΩ/250V

1mA

250KΩ(load)

≤

1mA

200MΩ/500V 500KΩ(load)

0~1000MΩ

/1000V 1MΩ

1000~2000MΩ

/1000V

7 8

2. PARTS & CONTROLS

① Digital Display

② Data Hold Button

③ Lock Button

④ Backlight Button

⑤ Test Button

⑥ Rotary Function switch

⑦ VΩJack

⑧ COM input jack

⑨ Pothook

⑩ Battery Cover

3. BATTERY REPLACEMENT

3-1 How to connect test leads.

a). On MΩRange: Connect the red test lead into the “VΩ”

terminal and the black lead into the “COM” terminal.

b) On 200Ωand ACV Range: Connect the red test lead into

the “VΩ” terminal and the black lead into terminal “COM”

3-2 Battery Check-UP & Replacement

a) As battery power is not sufficient. LCD will display .

Replacement of 6 pcs new batteries, type 1.5V size “AA”

is Required.

b). Place back the battery cover and four the screws.

3-3 Test leads check

Set the range select switch to the 200Ωrange. With the tip

and alligator clip of the test leads connected. The indicator

should read 00.0Ω. When the leads are not connected the

display will read infinity indicated by “1”. This will ensure that

test lead are under working condition.

4. INSULATION RESISTANCE

MEASUREMENTS

a). Measurements at 200MΩ/250V This is the voltage used

for the majority of insulation resistance tests on normal

installation requirement. To measure insulation resistance,

press the test button to power on the tester. The LCD will

displayed the insulation resistance. Section VII indicated

9 10

that subdivision of large installations might be necessary

because of the large number of parallel insulation

resistance. In such a case, an installation may be divided

into sections, each being separately tested. Each section

must have not less than fifty outlets, an outlet being a

switch, socket, lighting point etc. A switched socket

counts as one outlet. The minimum acceptable insulation

resistance is 1MΩ. For a large installation, the

capacitance of the insulation will be high, and it will take

longer for it to become charged by the direct testing

voltage. Care must be taken not to take a reading until

there is a steady reading, indicating that the charging

process is complete.

Note: The charge stored in the insulation will be discharged

automatically when the test button is released. Be

careful not to turn the range switch knob whilst the test

button is pressed, or the instrument will be damaged.

b). Measurements at 2000MΩ/1000V

Some specifications require testing at 1000V. This voltage

must also be selected where the supply voltage of the

installation is between 500V and 1000V. First, set the

range switch to 1000V and then proceed as indicated in a

above for 500V testing. The above note also applies to

testing at 1000V. In addition the following applies.

Note: Make sure that the circuit under does not include

components Which will be damaged by the 1000V

applied. Many normal components of an installation are

likely to be damaged if tested at 1000V. Examples are

power factor correction capacitors, low voltage mineral

insulated cables, electronic light dimmers, electronic

ballasts and starters for fluorescent lamps etc…

c). Lock power on Feature

For hands free operation a lock power on feature is

incorporated on the press to test button. Set LOCK button

to lock test voltage, Pressing it again will tester off.

5. LOW RESISTANCE (CONTINUITY)

MEASUREMENTS

a). Set the range switch to 200Ω·))) Position

b). Connect the red test lead to the V Ωterminal and black to

the COM terminal.

c). Connect the tips of the test leads to both ends of the

circuit under test. read resistance in Ωon the LCD.

d). When the impedance on circuit is below approximately

40Ω.It will indicate by a continuous beeper.

6. AC/DC VOLTAGE MEASUREMENTS

a). Set the range switch to ACV or DCV position

b). Connect red test lead to “V Ω” terminal and black test lead

to terminal “COM”.

c). Connect test prods of test leads IN PARALLEL to the

circuit being measured.

d). Read the voltage value on LCD.

11 12

7. POWER TOOLS AND AMALL

APPLIANCES

This test would also apply to other similar equipment that has

a line cord. For double insulated power tools, the

megohmmeter lead shown connected to the housing would

be connected to some metal part lf the tool(e..g chuck,blade).

Note:The switch of the device must be in the “ON”position

and the main power should be disconnected.

MOTORS

AC-Disconnect the motor from the line by disconnecting the

wires at the motor terminals or by opening the main switch.

If the main switch is used and the motor also has a starter

then the starter must be held, by some means, in the “ON”

position. In the latter case, the measured resistance will

include the resistance of the motor, wire and all other

components between the motor and the main switch. If a

weakness is in dicated, the motor and other components

should be checked individually. If the motor is disconnected

at the motor terminals, connect one megohmmeter lead to

the grounded motor housing and the other lead to One of the

motor leads. DC-Disconnect the motor from the line. To test

the brush rigging,field coils and armature connect one

megohmmeter lead to the grounded motor housing and the

other lead to the brush on the commutator. If the resistance

measurement indicates a weakness,raise the brushes off the

commutator and separately test the armature, field coils and

brush rigging by connecting one megohmmeter lead to each

of them individually, leaving the other connected to the

grounded motor housing. The above also applies to DC

Gemerators.

13 14

CABLES

Disconnect the cable from the line. Also disconnect opposite

end to avoid errors due to leakage from other equipment.

Check each conductor to ground and /or lead sheath by

connecting one megohmmeter lead to a ground and /or lead

sheather and the other megohmmeter lead to each of the

conductors in turn. Check insulation resistance between

conductors by connecting megohmmeter leads to conductors

in pairs.

Indice

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