PCE Instruments IT55 User manual

INSTRUCTION MANUAL
PCE-IT
www.pce-industrial-needs.com
Tursdale Technical Services Ltd
Unit N12B
Tursdale Business Park
Co. Durham
DH6 5PG
United Kingdom
Phone: +44 ( 0 ) 191 377 3398
Fax: +44 ( 0 ) 191 377 3357
[e-mail]
http://www.industrial-needs.com/

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INSTRUCTION MANUAL ......................................................................... 1
1.SAFETY INFORMATION....................................................................... 3
2. SPECIFICATIONS................................................................................ 3
OHMS ....................................................................................................................................................4
Continuity Beeper ................................................................................................................................4
Meg OHMS ............................................................................................................................................5
3. PARTS & CONTROLS ......................................................................... 5
4. BATTERY REPLACEMENT................................................................. 6
5. INSULATION RESISTANCE MEASUREMENTS................................. 6
6. LOW RESISTANCE (CONTINUITY) MEASUREMENTS..................... 7
7. AC/DC VOLTAGE MEASUREMENTS................................................. 7
8. POWER TOOLS AND AMALL APPLIANCES..................................... 7
MOTORS ...............................................................................................................................................7
CABLES ................................................................................................................................................8

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1.SAFETY INFORMATION
zRead the following safety information carefully before attempting to operate or
service the meter.
zTo avoid damages to the instrument do not apply the signals which exceed the
maximum limits shown in the technical specifications tables.
zDo not use the meter or test leads if they look damaged. Use extreme caution
when working around bare conductors or bus bars.
zAccidental contact with the conductor could result in electric shock.
zUse the meter only as specified in this manual; otherwise, the protection provided
by the meter may be impaired.
zRead the operating instructions before use and follow all safety Information.
zCaution when working with voltages above 60V DC or 30V AC RMS. Such
voltages pose a shock hazard.
zBefore taking resistance measurements or testing acoustic continuity, disconnect
circuit from main power supply and all loads from the circuit.
1.2 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
2. SPECIFICATIONS
2.1 General Information
Environment conditions:
①Installation Categories II
②Pollution Degree 2
③Altitude up to 2000 meters
④Indoor use only
⑤Relatively humidity 80% max.
⑥Operation Ambient 0~40ºC
Maintenance & Clearing:
①Repairs or servicing not covered in this manual should only be performed by
qualified personnel.
②Periodically wipe the case with a dry cloth. Do not use abrasives or solvents on
this instruments.
Display: Large LCD with dual display

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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.
2.2 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
•))) 0.1ΩResistance≤40Ω4.5V 250Vrms
Short circuit current ≤200mA
DC Voltage
Range Resolution Accuracy Input
Impedance
Overload
Protection
1000V 1V +(0.8%+3) 10MΩ1000Vrms

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AC Voltage (40Hz~400Hz)
Range Resolution Accuracy Input
Impedance
Overload
Protection
750V 1V +(1.2%+10) 10MΩ750Vrms
Meg OHMS
Range Resolution Accuracy Terminal Voltage
200MΩ/250V 0.1MΩ
+(3%+5)
250V+10%~-0%
200MΩ/500V 0.1MΩ500V+10%~-0%
0~1000MΩ/1000V
1MΩ
1000V+10%~-0%
1000~2000MΩ
/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
3. PARTS & CONTROLS
① Digital Display

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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
4. BATTERY REPLACEMENT
4.1 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”
4.2 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.
4.3 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.
5. 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 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.

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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.
6. 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.
7. 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.
8. 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

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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.
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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In this direction will find a vision of the measurement technique:
http://www.industrial-needs.com/measuring-instruments.htm
NOTE: "This instrument doesn’t have ATEX protection, so it should not be used in potentially explosive
atmospheres (powder, flammable gases)."