PCE Instruments PCE-IT55 Instruction Manual

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DIGITAL INSULATION TESTER
INSTRUCTION MANUAL
SAFETY INFORMATION
Read the following safety information carefully before
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.
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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:
①①①① Installation Categories II ②②②② Pollution Degree 2 ③③③③ Altitude up to 2000 meters ④④④④ Indoor use only ⑤⑤⑤⑤ Relatively humidity 80% max. ⑥⑥⑥⑥ Operation Ambient 0~40ºC
Maintenance & Clearing:
①①①① Repairs or servicing not covered in this manual should
only be performed by qualified personnel.
②②②② 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: 200, 200k, 200M/250V,
200M/500V, 2000M/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.
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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
200 0.1
+(1%+2)
4.5V 250Vrms
200k 0.1k 3.0V
Continuity Beeper
Range Resolution Operation
Resistance
Max.open Circuit Voltage
Overload Protection
•))) 0.1 Resistance40Ω 4.5V 250Vrms
Short circuit current 200mA
DC Voltage
Range Resolution Accuracy Input
Impedance
Overload Protection
1000V 1V +(0.8%+3) 10M 1000Vrms
AC Voltage (40Hz~400Hz)
Range Resolution Accuracy Input
Impedance
Overload Protection
750V 1V +(1.2%+10) 10M 750Vrms
Meg OHMS
Range Resolution Accuracy Terminal Voltage
200MΩ/250V 0.1MΩ
+(3%+5)
250V+10%~-0%
200MΩ/500V 0.1MΩ 500V+10%~-0%
0~1000MΩ/1000V
1MΩ
1000V+10%~-0%
1000~2000M
/1000V
+(5%+5)
Range Test Current Short circuit current 200M/250V
1mA
250K(load)
1mA
200M/500V 500K(load) 0~1000MΩ /1000V
1M
1000~2000M /1000V
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2. PARTS & CONTROLS
Digital Display Data Hold Button Lock Button Backlight Button Test Button Rotary Function switch V Jack COM input jack Pothook Battery Cover
3. BATTERY REPLACEMENT
3-1 How to connect test leads.
a). On M Range: Connect the red test lead into the “V
terminal and the black lead into the “COM” terminal.
b) On 200 and ACV Range: Connect the red test lead into
the “V” 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 200 range. With the tip and alligator clip of the test leads connected. The indicator should read 00.0. 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 200M/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
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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 1M. 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 2000M/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 200 ·))) Position b). Connect the red test lead to the V terminal 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 on the LCD.
d). When the impedance on circuit is below approximately
40.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 ” 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.
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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.
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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.
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