Isotech IIT 1500 User manual

EN50419: 2006
Instruction Manual
IIT 1500
Insulation tester
IIT 1500
LPF
OFF
RECALL
COMP STORE LOCK
PASS
PI/DAR
TEST
FUSED
V
!
INSULATION> 660V
COM
CAT IV
600 V
!
500V
1000V
250V50V
0
TEST
100Gk
10Gk
100k
0
10M
100kM
100M
COMPARE 100 200
500 KM
PI DAR
MEM APO LPFLOCKAUTO SENSE
+
AC
DC
AC
DC
K M Ω
G
µ m A
0
100V
L
e
a
k
a
g
e
C
u
r
r
e
n
t
M


2
IIT 1500 English
Safety Information
Introduction
Specications
Operation
Battery and Fuse Replacement
Mantenance

3
IIT 1500 English
SECTION 1 - SAFETY INFORMATION
Safety Information
Read and understand this instruction manual completely before using this
instrument. Failure to observe the warnings and cautions in this instruction
manual may result in injury, death or damage to the instrument and other
equipment or property.
If this instrument is used in a manner not specied in these instructions,
the protection provided by the instrument may be impaired.
Warning
Identies hazardous conditions and actions that could cause BODILY HARM
or DEATH.
Caution
Identies conditions and actions that could DAMAGE the tester or equipment
under test.
WARNING
• Examine the instrument and probes before use. Do not use the instrument if
it is wet or damaged
• When using test leads or probes, keep your ngers behind the
nger guards
• Remove test leads from instrument before opening the battery door or
instrument case
• Use the instrument only as specied in this manual or the protection by the
instrument might be impaired
• Always use proper terminals, switch position, and range
for measurements
• Verify the instrument is operating correctly by measuring a known voltage
before use. If in doubt, have the instrument calibrated
• Do not apply more than the rated voltage, as marked on instrument, between
terminals or between any terminal and earth ground
• Only replace the blown fuse with the correct type and rating as specied in
this manual
• Use caution with voltages above 30 Vac rms, 42 Vac peak , or 60 Vdc. These
voltages pose a shock hazard
• To avoid false readings that can lead to electric shock and injury, replace
battery as soon as low battery indicator “<” appears
• Disconnect circuit power and discharge all high-voltage capacitors before
making resistance measurements
• Do not use the instrument in hazardous areas or around explosive gases or
vapours
• Wear suitable personal protective equipment when working around or near
hazardous live conductors which could be accessible.

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IIT 1500 English
CAUTION
• Disconnect the test leads from the test points before changing the position of
the function rotary switch
• Never connect a source of voltage with the function rotary switch in the Ω,
50V,100V,250V, 500V or 1000V position
• Do not expose the instrument to extremes in temperature or high humidity
• Never set the instrument in Ω, 50V,100V, 250V, 500V or1000V function to
measure the voltage of a circuit. This could result in damage to the tester and
the equipment under test.
Symbols as marked on the instrument and instructions leaet
Unsafe Voltage
To alert you to the presence of a potentially hazardous voltage, when the
instrument detects a voltage ≥2 V in resistance mode, ≥30 V in insulation test,
or a voltage overload (OL), the ”  “ symbol is displayed and the High Voltage
indicator is turned on. In this condition the test is inhibited.
Risk of electric shock
See instruction leaet
DC measurement
Equipment protected by double or reinforced insulation
Battery
Fuse
Earth
AC measurement
Conforms to EU directives
Dispose of in accordance with local regulations
+









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IIT 1500 English
SECTION 2 - INTRODUCTION
Unpacking and Inspection
Unpack the instrument and check the contents for damage. If any items are
damaged or missing, contact the supplier.
The instrument is supplied with the following items:
1. The insulation tester
2. One pair of test-leads (one red lead and one black lead)
3. This instruction manual
4. One pair of crocodile-clips
(One red clip and one black clip)
5. Remote test probe
6. Protective rubber holster
7. Tester hanging kit
8. Batteries
Instrument Description
Front Panel Illustration
1. LCD display: 4000 counts
2. Push-buttons for features
3. Rotary switch to turn the Power On or Off and to select a function
4. Input terminal for Ω function
5. Common (Ground reference) Input terminal for all functions.
6. Input terminal for voltage measurement & insulation test functions
LPF
OFF
RECALL
COMP STORE LOCK
PASS
PI/DAR
TEST
FUSED
V
!
INSULATION> 660V
COM
CAT IV
600 V
!
TEST
100Gk
10Gk
100k
0
10M
100kM
100M
COMPARE 100 200
500 KM
PI DAR
MEM APO LPFLOCKAUTO SENSE
+
AC
DC
AC
DC
K M Ω
G
µ m A
0
Display
Features
Pass Indicator
High Voltage Indicator
Functions & Power On/Off
Ω Input
Common Input
V insulation Input
1
2
3
4
5
6

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IIT 1500 English
SECTION 3 - SPECIFICATIONS
General Specications
Maximum voltage applied to any terminal: 600 V ac rms or dc.
Display: 4000 counts.
Polarity Indication: Automatic, positive implied, negative indicated.
Overrange Indication: OL
Batteries Life (new batteries at room temperature):
Resistance Measurements: Minimum of 2600 earth-bond resistance
measurements: standard tests of 1Ω with a duty cycle of 5 seconds on and 25
seconds off.
Insulation test: M inimum of 1100 insulation tests: standard tests of 1 MΩ at
1000 V with a duty cycle of 5 seconds on and 25 seconds off.
Low Batteries Indication: “<” is displayed when the batteries voltage drops
below operating voltage.
Low battery voltage: Approx. 4.5V
Auto Power Off: Approx 20 minutes.
Operating Ambient Temperature:
≤10°C Non-condensing
11°C ~ 30°C (≤ 80% RH)
30°C ~ 40°C (≤ 75% RH)
40°C ~ 50°C (≤ 45%RH)
Storage Temperature: -20°C to 60°C, 0 to 80% RH (batteries not tted)
Temperature Coefcient: 0.15 x (Spec.Accy)/°C, < 18°C or > 28°C .
Measurement Rate: Samples 2 times per second nominal.
Maximum Altitude: 2000 metres
Installation Category: Complies with EN61010-1, UL61010-1,
IEC 61010-1: CAT IV 600V
Pollution degree: 2

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IIT 1500 English
Category denitions
Compliance to EN 61557: IEC61557-1, IEC61557-2, IEC61557-4, IEC61557-10
Weight: 630g including battery.
Dimensions (W x H x D): 95mm x207mm x 52mm with holster.
Power requirements: 1.5V x 4 IEC LR6 or AA size.
EMC: EN 61326-1
Shock vibration: Sinusoidal vibration per MIL-T- 28800E
(5 ~ 55 Hz, 3g maximum).
Drop protection: 1 metre drop to hardwood on concrete oor.
Indoor use only
Measurement
Category
Application
IMeasurements on circuits not directly connected to mains. Examples
include: measurements on battery powered equipment and specially
protected (internal) mains-derived circuits.
II Measurements on circuits directly connected to the low voltage installa-
tion. Examples include: household appliances, portable tools and similar
equipment.
III Measurements performed in the building installation. Examples include:
measurements on distribution boards, junction boxes, socket-outlets and
wiring and cables in the xed installation.
IV Measurements performed at the source of the low-voltage
installation. Examples include: measurements on primary overcurrent
protection devices and electricity meters

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IIT 1500 English
Voltage Measurement
Function Range Accuracy
DCV 600.0V ±(1%+5dgt)
ACV 600.0V ±(1.5%+5dgt) (50~60Hz)
±(2%+5dgt) (61~500Hz)
LPF ACV 600.0V ±(1.5%+5dgt) (50~60Hz)
±(5%+5dgt) (61~400Hz)
Start measuring voltage: ≥ AC 0.6V.
Over voltage protection:
600V rms or dc.
Low pass lter cut-off frequency: 1 kHz.
Input Impedance:
3MΩ // < 100pF.
CMRR / NMRR:
(Common Mode Rejection Ratio)
(Normal Mode Rejection Ratio)
VAC:
CMRR > 60dB at DC, 50Hz / 60Hz
VDC:
CMRR > 100dB at DC, 50Hz / 60Hz
NMRR > 50dB at DC, 50Hz / 60Hz
AC Conversion Type:
AC conversions are ac-coupled, true rms responding, calibrated to the sine
wave input.
Non-sine wave Crest
Factor corrections:
For Crest Factor of 1.4 to 2.0, add 1.0% to accuracy.
For Crest Factor of 2.0 to 2.5, add 2.5% to accuracy.
For Crest Factor of 2.5 to 3.0, add 4.0% to accuracy.
Maximum permissible
Crest Factor:
3 @ 330V; 2 @ 500V

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IIT 1500 English
*<1.00Ω add 3 digits
Function Range Accuracy
Resistance /
Continuity
40.00Ω ±(1.5%+5dgt)*
400.0Ω
4000Ω
40.00kΩ
±(1.5%+3dgt)
Resistance / Continuity Measurement
Insulation Resistance Measurement
Function Range Accuracy *
Insulation
Resistance
4.000MΩ
40.00MΩ ±(1.5%+5dgt)
400.0MΩ
4000MΩ ±(3%+5dgt)
4.1GΩ~20.0GΩ ±(10%+3dgt)
* Above specications only apply when high quality silicone leads with test clips
are being used with no hands touching.
Test Voltage vs. Maximum resistance range:
50V/50.0MΩ, 100V/100.0MΩ, 250V/250.0MΩ, 500V/500MΩ and 1000V/20.0GΩ.
Test Voltage vs. Minimum resistance (with test current = 1mA):
50V/50kΩ, 100V/100kΩ, 250V/250kΩ, 500V/500kΩ and 1000V/1MΩ.
Test Voltage Accuracy: -0%,+20%
Short Circuit Test Current: 1mA (nominal)
Auto discharge function: discharge time <1 sec for C≤1µF
Maximum Capacitive load: 1µF
Live Circuit Detection: if ≥30V ac/dc at inputs, test inhibited
Open Circuit Test Voltage: >4.0V,<8V
Short Circuit Current: >200.0mA
Live Circuit Detection: if ≥2V ac/dc at inputs, test inhibited

10
IIT 1500 English
LPF
LPF
COM
V
INSULATION
V
AC
V
AUTO SENSE
AUTO SENSE
30V
DC
SECTION 4 - OPERATION
Making Basic Measurements
Preparation and caution before measurement
: Observe all warnings and cautions
When connecting the test leads to the device under test connect the common
(COM) test lead before connecting the live lead; when removing the test leads
remove the live test lead before removing the common test lead. The gures on
the following pages show how to make basic measurements.
Measuring ACV/DCV: Auto sense function
Auto sense mode: The instrument displays ACV or DCV whichever is higher (>0.3V).
If the measured voltage is above 660Vac/dc, “> 660Vac/dc” will appear on
the display.

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IIT 1500 English
Measuring ACV/DCV: Auto sense + LPF function
Press
V
AUTO SENSE
AC AC
AUTO SENSE LPF
V
Measuring Resistance / Continuity
10Gk
100M
100k
0
10M
100kM
0
COM
Press
TEST
100Gk
10Gk
100M
0
10M
100k
100kM
&
hold
0
100Gk

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IIT 1500 English
Measuring Insulation Resistance
TEST
500V
500V
INSULATION
V
COM
100Gk
100k
0
10M
10Gk
100kM
100M
M
Press
100Gk
TEST
DC
V
DC
V
10M
100k
0
hold
10Gk
100kM
100M
M
=
TEST
&
1. Before starting the test:
The circuit under test must be completely de-energized.
If the voltage detected is above 30V, “>30V” will appear on the display.
In this condition the test is inhibited.
1. Before starting the test:
(a) The circuit under test must be completely de-energised. Check the fuse before
testing. See “Testing the fuse” later in this manual. Connecting to an
energised circuit whilst the test is active will cause the fuse to fail. If the detected
voltage is above 2V, “>2V” will appear on the display. In this condition the test is
inhibited.
(b) Short the test leads before measurement and press the blue button to
compensate for probe resistance that is less than 2Ω. When the probe
resistance is stored, “->0<-” symbol will be displayed.
2. To start the test press and hold the TEST button on either the probe or the
instrument. The test will continue until the button is released.
3. The instrument displays the “>” symbol when the measured resistance is
higher than the maximum value for the range.
4. Lock mode:
Press the LOCK button to enter the Lock Mode.
Press the TEST button to start the test.
The test will continue until the TEST or LOCK button is pressed again.

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IIT 1500 English
Using the Compare function
1. Before starting the insulation test: Press the COMP button to select the
comparison value from 100kΩ, 200kΩ, 500kΩ, 1MΩ, 2MΩ, 5MΩ, 10MΩ,
20MΩ, 50MΩ, 100MΩ, 200MΩ and 500MΩ.
2. If the measured value is greater than the selected comparison value, the
green PASS indicator will be turned on.
Press ≥ 2Sec
Press
2
2
1
1
100kM
10Gk
M
100Gk
100K
100k
10M
0
100M
COMPARE
100K ......500M
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
COMP
DC
V
2. Press the blue button to display insulation resistance or leakage current
during the test or when the test stops.
3. To start the test, press and hold the TEST button on either the probe or the
instrument. The test will continue until the button is released.
4. Release the TEST button before removing the test leads (to enable the
tester to discharge capacitive circuits). If the screen displays a voltage, wait
until it reaches zero.
5. The tester displays the “>” symbol when the measured resistance is higher
than the maximum value for the range.
6. Lock mode:
Press the LOCK button to enter the Lock Mode.
Press TEST button to start the test.
The test voltage will continue to be applied until the TEST or LOCK button is
pressed again.

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IIT 1500 English
Measuring PI/DAR
Press ≥ 2Sec
Press ≥ 2Sec 2
1
Press 3
2
1
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
LOCK
PI/DAR
PI
Press ≥ 2Sec
Press 2
3
1
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
DAR
PI(Polarization Index) = R10-min/R1-min
DAR(Dielectric Absorption Ratios) = R1-min/R30-sec
Where:
R10-min: the insulation resistance measured at 10 minutes after pressing the
TEST button.
R1-min: the insulation resistance measured at 1 minute after pressing the
TEST button.
R30-sec: the insulation resistance measured at 30 seconds after pressing the
TEST button.
If the reading for DAR is higher than 1.3 or PI is higher than 2, this indicates a
good level of insulation quality.
When the measured resistance is higher than the maximum range, the screen
will display “Err” symbol for PI/DAR value.
TEST button: Press once to start/interrupt the PI /DAR test.
Blue button: Press once during the PI/DAR test to display the remaining time of
the test.

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IIT 1500 English
The measured values after the DAR test
DAR=R1-min/R30-sec
The measured values after the PI test
PI=R10-min/R1-min
R10-min
R1-min
Press 2
1
DC
V
PI
Press 1
3
M
PI
Press 3
2
M
PI
R1-min
R30-sec
Press 2
1
DC
V
DAR
Press 1
3
M
DAR
Press 3
2
M
DAR

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IIT 1500 English
Using the RECALL function
Press the STORE/RECALL button ≥2 sec to enter/exit the RECALL mode.
If the memory is empty, the tester will display the “nOnE” symbol.
Search the stored value under RECALL mode
COMP
Press
Press
1
MEM
M2
MEM
M
3
MEM
M
Using the STORE function
STORE/RECALL button:
Measurement results can be stored in the tester memory for subsequent recall
to the display.
Press the STORE/RECALL button once to store the voltage value during a
voltage test.
Press the STORE/RECALL button once to store the PI/ DAR, insulation or
resistance value when the individual tests are completed.
The data storage location number the “MEM” symbol will ash twice when the
data is stored.
Note. The memory is divided into ve segments, with each segment able to
store up to a maximum of 100 pieces of data. The method to store the data is
rst in / rst out when the memory is full.
NOTE:
Press the STORE/RECALL button ≥5 sec to clear the stored data.
The display will ash the “MEM” symbol and “ cLr ” twice.
segments
Items
Voltage Earth-Bond
resistance
Insulation
resistance
50~1000V
DAR PI
1 Voltage Resistance Resistance DAR value PI value
2 Leakage
current R30-sec R1-min
3 Test voltage R1-min R10-min
The stored values of the individual test

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IIT 1500 English
Read the stored values of DAR test in RECALL mode
Press the PI/DAR button ≥2 sec to choose the DAR function and press the
STORE/RECALL button ≥2 sec to enter the RECALL mode.
Read the stored value of insulation test under RECALL mode
R1-min
R30-sec
Press 2
1
DAR
DAR
DAR
Press 2
3
M
Press 3
2
M
MEM
MEM
MEM
1
2
STORE
RECALL
A
Press ≥ 2Sec
Press ≥ 2Sec 2
1
Press 3
2
1
M
DC
V
M
STORE
RECALL
Press ≥ 2Sec
Press 4
3
1
MEM
MEM
Press ≥ 2Sec
Press 2
4
1
MEM
DC
V
Insulation
Resistance
Leakage
Current
Test
Voltage

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IIT 1500 English
Auto Power Off (Battery Saver)
LPF
V
AC 20min
OFF OFF
APO
APO
Restore power by turning the rotary switch or pressing any button.
Auto Backlight
The backlight is automatically turned on in a dark environment.
Read the stored values of PI test in RECALL mode
Press the PI/DAR button ≥2 sec. to choose the PI function and press the
STORE/RECALL button ≥2 sec. to enter the RECALL mode.
R10-min
R1-min
Press 2
1
PI PI
Press 2
3
M
Press 3
2
M
MEM
MEM
MEM
1
PI 2
STORE
RECALL

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IIT 1500 English
Refer to the following
gure to replace the fuse
and the batteries:
3
2
1
SECTION 5 - BATTERY & FUSE REPLACEMENT
Caution
The following safety information must be observed to ensure maximum personal
safety during the operation of this Tester.
1. To avoid electric shock, disconnect the test leads before replacing the tester
fuse or batteries.
2. When replacing the tester batteries, do not mix batteries of different types or
old and new batteries.
3. Check the battery polarity carefully when inserting the batteries.
4. Do not short-circuit used batteries, disassemble them, or throw them in a re.
Doing so may cause the batteries to explode.
5. Dispose of the used batteries in accordance with local regulations.
Buzzer
The buzzer beeps once for every valid key-press, and beeps twice for every
invalid key-press.
Power-up options:
Press the following buttons while turning tester on.
LOCK button: display the software version.
STORE button: Reset all stored data
Blue button: disable auto power off.
Caution
Use only a fuse with the following fuse rating:
Fuse rating : Fast, 315mA, 1000V, Min Interrupt Rating 10KA
(Such as SIBA 70 172 40 or equivalent)
• Replace the batteries as soon as the low batteries indicator “<” appears
• When the battery is too low for reliable operation , the tester displays “ bAtt”.
The instrument will not operate until the battery is replaced.
• Replace with 4 x 1.5V AA alkaline batteries.