LEM ISO plus User manual

Operating Instructions
Gebrauchsanleitung
Manuel d'utilisation
Guida all’uso
Instrucciones de uso
MULTIFUNCTION INSULATION TESTER /
MULTIFUNKTIONALES ISOLATIONSMESSGERÄT /
APPAREIL DE MESURE D'ISOLEMENT MULTIFONCTION /
TESTER D’ISOLAMENTO A TENAGLIA MULTIMETRO /
TÉSTER DE AISLAMIENTO MULTIFUNCIÓN
ISO plus
plusplus
plus
1 mA
OFF
100 V 250 V 500 V
1000 V
600 V
V mA
ISO plus
R
Hz
Pab
20 0 0
LIMIT
HOLD
REC MAX
AVG MIN
STORE
RECALL
ZERO
DATA
ACTIVE AC+DC
+
ISO
U
ISO
U
R
1M 400 10M 600100M800 1G 1 00010G
V
10 0k
MkAVk
m
A
G
u
MkAVk
m
G
K
K
START
HOLD
REC
ZERO
M
Ω
ΩΩ
Ω
Ω
ΩΩ
Ω
V
mA
LIMIT

Order Reference
- 2 -
Order Reference Order No.
ISO plus
plusplus
plus – Multifunction Insulation Tester SI1300Z
Includes:
• Manual E/G/F/I/ES incl. CE-declaration of conformity
• 1 Pair of test leads with test prods (red/black)
• 1 alligator clip
• 4 pcs. 1,5V AA LR6 MN 1500 batteries
• 1 pouch with carrying belt
Optional Accessories
• 1 Pair of test leads with test prods (red/black) SB0001Z
• Probe for surface insulation measurement A604507000
• 3 alligator clips, black A600917103

Contents
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Thank you for buying this product.
Unpacking: check delivery for possible damage during transport.
Keep the packing material for future transportation and check delivery
contents for completeness.
Contents:
1Safety Regulations..........................................................................................4
2Instrument features ........................................................................................6
3Insertion / replacement of battery and fuse..................................................8
4Getting started / Operating principles...........................................................9
5Basic operation.............................................................................................11
5.1 Insulation test............................................................................................ 11
5.2 Resistance measurement / Continuity ...................................................... 13
5.3 Voltage measurement............................................................................... 15
5.4 Current measurement ............................................................................... 17
6Advanced functions......................................................................................19
6.1 Determining the Dielectric Absorption ratio Rab in Insulation test.............. 19
6.1.1 Determining the Polarization Index Ip ....................................................... 20
6.2 Transducer input (for voltage output current probes) ................................ 21
6.3 HOLD........................................................................................................ 21
6.4 LIMIT (Alarm) ............................................................................................ 22
6.5 REC (Record) ........................................................................................... 23
6.6 ZERO ........................................................................................................ 23
6.7 Back-light .................................................................................................. 23
7Programming functions Kapitel Mémoire löschen ....................................24
8Technical Data ..............................................................................................26
8.1.1 General ..................................................................................................... 26
9Upkeep and Maintenance............................................................................. 31
10 Other products.............................................................................................. 32

Safety Regulations
- 4 -
1 Safety Regulations
• Safety warnings and precautions must be read and understood before the
instrument is used. They must be observed during use. Operating
electrical devices implies that parts of the device carry dangerous
voltages. Disregarding warning notices may lead to serious physical
injury and material damage. For example: touching the key tips.
• This measuring device is only to be installed and operated by qualified
personnel and according to the technical data in compliance with the safety
precautions and regulations set forth below. Additionally, the use of this
equipment requires compliance with all legal and safety regulations pertaining
to each specific application. Similar regulations apply to the use of accessories.
• Test leads, prods and crocodile clips must be in good order; clean, and with no
broken or cracked insulation
• Replacement fuses must be of correct size, type and rating
• It can be assumed that safe operation is no longer possible if the device
- shows visible damage,
- has been exposed to unfavourable conditions (e.g. storage beyond
the permissible climatic limits without adaptation to the ambient
climate, dewing etc.) or to
- has been exposed to major strain during transport (e.g. been dropped
from some height without visible external damage etc.).
• No measurements must be performed on unprotected measuring circuits.
• Avoid working alone.
International Elecrical Symbols used on the instrument:
Caution! Refer to the instructions before using this instrument.
Equipment protected throughout by Double insulation (Protection Class II)
Equipment complies with relevant EU Directives
Dangerous voltage
COM Ground
Qualified Personnel are persons familiar with the setting up, installation, starting off
and operation of the device and possess a formal qualification required for such
activities.

Safety Regulations
- 5 -
The instrument has been designed to comply with IEC1010-2-032 Installation
Category (Overvoltage Category) III 600V Pollution degree 2 and
UL 3111-1. The instrument conforms with the EEC Low Voltage Directive
73/23/EEC and 93/68/EEC.
IEC 1010 is a safety standard which has the following features:
• Installation categories I to IV relate the maximum working voltage to overvoltage
transients that can be expected in the measuring environment. For the
instrument, 600V CAT III, the maximum expected transients must not exceed
6kV peak.
• In a pollution degree 2 environment the internal design of the instrument can
cope with transient conductivities due to condensation.
Safe operation of the instrument is the responsibility of the operator who
must be suitably qualified and/or authorised as defined above. Users of this
equipment and or their employees are reminded that Health and Safety
Legislation requires them to carry out valid risk assessments of all electrical
work, so as to identify potential sources of electrical danger and risk of
electrical injury such as from inadvertent short circuits. Where the
assessments show that the risk is significant, then the use of fused test leads
constructed in accordance with the HSE guidance note GS38 ‘Electrical Test
Equipment for use by Electricians’ is advised.
If the instrument is used in a manner not specified by the manufacturer, then the
protection provided by the equipment may be impaired.
Maximum Safe Voltage
Voltage:- 600V MAXIMUM AC RMS or DC between live conductor and ground.
600V MAXIMUM AC RMS or DC between V and COM terminals and a maximum
frequency of 1kHz.
Important Information
• The instrument is intended for indoor use only.
• Do not attempt to take any measurement of current or voltage higher than the
maximum range of the instrument.
• The unit is not hermetically sealed and should NOT be brought into contact with
surface water.
• Frequently inspect the test leads and the instrument for damage. If the
instrument is physically damaged or does not function properly, it should not be
used.
USE ONLY SUITABLY RATED VOLTAGE TEST LEADS TO IEC 1010-2-031.
(600V CAT III Pollution Degree 2).

Instrument features
- 6 -
2 Instrument features
This instrument has been manufactured complying with Quality Assurance System DIN
ISO 9001. The compliance with the current applicable EMC-regulations is indicated by
the CE-sign and markings on the instrument.
Two instruments in one hand-held housing:
- Compact and universal insulation tester
- Industry standard TRMS multimeter
The instrument has been designed specially for contractor/service technician
applications. In addition to insulation testing up to 1 kV the instrument
incorporates low resistance and continuity testing as well as leakage current
measurement directly or with LEM current probes (CT’s). Selectable scaling
factors provide current ranges from 200µA to 200 A. Furthermore the
instrument offers all the functionality of industry standard multimeters
including TRMS voltage and frequency measurement in a true hand held
design.
Main features:
• Easy to use handheld design measuring V, Ω, MΩ, Hz, A (mA)
• Large dual display with bright EL backlight and bargraph
• Unique built in protection against external voltages without fuse damage and
warning of live circuits
• Fully compliant with all European standards for insulation testing
• Insulation measurements up to 20 GΩwith 100, 250, 500 and 1000V test
voltages and display of test current
• On screen display of Polarisation Index and Dielectric Absorption Ratio for
insulation quality
• Auto ranging resistance measurement to 200kΩwith 200mA low resistance test
and lead compensation
• Continuity test with adjustable thresholds and fast responding buzzer
• True RMS voltage measurement with display of AC, DC and AC+DC values and
mV resolution
• Leakage current measurement directly or with LEM current probes in current
ranges from 200 µA to 200A
• LIMIT (adjustable alarm) to quickly and reliably identify fault conditions
• REC function for MIN, MAX, AVG values
• ZERO (∆REL) function to compensate measuring leads and for relative
measurements

Instrument features
- 7 -
ARotary switch for function selection
BDual parameter display with backlight
CKeyboard
D,E Test lead input terminals
Rotary switch functions
A
B
C
D
E
F
H
G
1.1 Keyboard
Display change key
ZERO: relative measurements, test lead
compensation
REC mode: Max, Min, Average
Cursor control in input mode (digit select)
START Measurement in RISO, otherwise HOLD
Continuity in resistance / Backlight ON for
30s (2sec press)
Activate LIMIT
Increment selected digit
OFF Position direct power OFF switching
U ISO = 100 V test voltage
U ISO = 250 V test voltage
U ISO = 500 V test voltage
U ISO = 1000 V test voltage
Continuity test activated by key press in Ω200mA
Resistance Measurement 20Ω... 200 kΩ
Voltage AC/DC True RMS, Frequency Hz
Current AC RMS, Frequency Hz
1 mA
A
B
C
DE
OFF
100 V 250 V 50 0 V
1000 V
600 V
V mA
ISO plus
R
Hz
Pab
200 0
LIMI T
HOLD
REC MAX
AVG MIN
STOR E
RECALL
ZERO
DATA
ACT IVE AC+DC
+
U
U
R
1M 400 10M 600100M 800 1G 10001 0G V 100k
u
MkAVkm
G
MΩ
ΩΩ
Ω
Ω
ΩΩ
Ω
V
mA
START
HOLD
REC
ZERO
LIMIT
START
HOLD
REC
ZERO
LIMIT
A
B
C
D
E
F
H
G
1 mA
OFF
100 V 250 V 500 V
1000 V
MΩ
ΩΩ
Ω
Ω
ΩΩ
Ω
V
mA

Insertion/replacement of battery and fuse
- 8 -
3 Insertion / replacement of battery and fuse
Replacement with other than the specified batteries will invalidate the warranty.
Fit only Battery Type 1.5V Alkaline MN1500, IEC LR6 or equivalent x 4.
The low battery indicator will appear on the LCD display to indicate that the
minimum operating battery voltage has been reached.
To change the batteries, see Fig.1 Battery replacement below
• Switch off the instrument
• Undo the retaining screws (Aand B) on the battery cover and lift the cover clear
of the unit.
• Replace the used batteries, take care of the polarity. If no lamptest is executed,
please remove batteries immediately and check for correct polarity.
• Ensure the battery cover is replaced and the locking screws tightened, before
further use.
• Replace Fuse Cwith the same type FF 630mA 6,3x32 660V /10kA
Fig. 1 Battery replacement
Discard used batteries according to manufacturer’s instructions.
SAFETY WARNING
Before removing the battery cover, make sure that all external voltages are
disconnected from the instrument. For certainty remove all leads and
disconnect the external current transformer .
C

Getting started/Operating principles
- 9 -
4 Getting started / Operating principles
Examine the instrument carefully, familiarizing yourself with the layout of the input
terminals, rotary switch, pushbuttons and display. Notice the WARNING information
and summary of power-on options.
If you have used a multimeter and a current clamp before, simply examining your
meter will probably give you a good idea how to use it. The following procedure is an
overview of how to take basic measurements.
Two principal functions exist depending on the selected rotary switch position:
Continuous running measurement functions as volts, milliamps or standard
resistance/continuity tests and insulation tests, where the measurement has to be
started with the button. The test voltage depends on the rotary switch
position ranging from 100V up to 1000V. The functionality of the button
depends on the selected mode. Start can either start a measurement in the
insulation test or for the continuous mode functions (V, mA,Ω) it enables the
HOLD mode, where the actual displayed values in the LCD-display is frozen. In
insulation test after pressing more than 10 s instrument enters continuous
mode until is pressed again.
1. Insert the test leads in the appropriate input terminals COM and V ΩmA
2. To turn the instrument on and select a function, turn the rotary switch from OFF to
the appropriate switch position. All segments on the liquid-crystal display (LCD)
will turn on for 3 seconds, then the meter is ready for normal operation.
The button switches between different screens displaying more data about
the measurement being made. For example, switching between limit or
frequency display and the different AC signal parts like RMS, TRMS.
3. To select an additional operation, press the appropriate pushbuttons underneath
the rotary switch as described in the items below.
• In the resistance measurement function the button enables the continuity
function. That means the continuity symbol in the LCD-display is activated and
the buzzer is also activated if the continuity limit is exceeded. The limit value
(trigger) can be set between 0.2Ωand 50Ωand defaults to 2Ω.
• For more advanced functions see section 6 of this manual
4. To take a measurement, use the test lead probes to make the proper contacts.
Remember, insert the instrument into the measuring circuit in parallel for
insulation, voltage and resistance and in series for current measurement or use
an external current transformer. Read the measurement on the display. If you did
not manually fix the highest range (by using the button while power on), the
range that provides the best resolution is automatically selected (auto range).

Getting started/Operating principles
- 10 -

Basic operation
- 11 -
5 Basic operation
5.1 Insulation test

Basic operation
- 12 -
 Select the insulation test voltage with the rotary switch
 Connect test leads and check for external voltages.
If the external voltage is greater than 10% of the test voltage, it is not
possible to make an insulation test for safety reasons
 Press the key until the displayed insulation resistance value is stable.
Pressing the START button for more than 10 seconds enables continuous
insulation resistance measurement
Attention: The
ACTIVE
announciators indicate that the instrument is
outputting dangerous high voltages
 Press the key to display the insulation test current IISO
 Press the key again to show the Absorbtion factor Rab (available after
60s of continuous insulation test)
 Press the key again to show the Polarisation factor IP(available after 10
minutes of continuous insulation test)
 Press the key again to return to the main screen showing the insulation
resistance
 Release the key or press this key again to stop continuous
measurement. Wait until external capacitors are unloaded before
disconnecting test prods
will flash in case of external voltages greater than 50V

Basic operation
- 13 -
5.2 Resistance measurement / Continuity

Basic operation
- 14 -
 Connect the test leads to the test object and check for external voltages.
 Select the resistance measuring mode by turning the rotary switch to the Ω
position.
If the external voltage is greater than 3V a warning symbol is displayed. Even
if a live voltage is present, the fuse will not be damaged.
 Test lead compensation can be activated by connecting the leads together
and pressing the key. The instrument is now in a Relative measurement
mode indicated by the ZERO announciator on the display. This mode is
also valid for continuity testing. The actual value of compensation Rzero is
indicated on the small display.
 Press the key to activate the continuity test with a 200mA test current,
and an audible alarm buzzer when measuring less than the adjusted
threshold.
 Adjust continuity level using the key from 0,2 to 50 Ohm,
selects the digit, increments the digit
Pressing the key again exists the LIMIT setting mode and activated the
new limit.

Basic operation
- 15 -
5.3 Voltage measurement

Basic operation
- 16 -
 Select the voltage measurement function by turning the rotary switch to the
V position
 Connect test leads to the voltage source – the instrument displays the True
RMS value and the frequency of any AC component
 Pressing the key cycles the display through the AC / DC components
of the voltage. The bargraph always shows the True RMS (AC+DC) value
 To activate the LIMIT (alarm) function press the key. To set the lower
limit press the key again and use the to selects the digit and
the key to increment the digit. When in this mode pressing the
first turns the lower limit value off completely.
 To set the higher limit press the key and use the arrow keys as above.
 To activate the LIMIT function press the key again.
To deactivate the LIMIT (alarm) function turn the rotary switch to a new
position.

Basic operation
- 17 -
5.4 Current measurement

Basic operation
- 18 -
 Select the current measurement function by turning the rotary switch to the
mA position.
 Press the button to view and to set the transformation ratio of a
connected probe (current or voltage). The big digits show Pro and the mA
symbol next to the big display flashes.
With the button it can be selected whether a current or a voltage
output probe will be connected to the instrument. – toggle between mA or
mV symbols.
With the key the transformation ratio selection can be entered. Now the
default ratio shown in the small display flashes. The key cycles through
the following loop of ratios: OFF 1, 10, 100, 500 or 1000.
1 and OFF in mA means direct current measurement with the delivered test
leads. 1:10, 1:100, 1:500 or 1:1000 means measurement through an external
current transformer with the selected transformation ratio.
 Press the button to return to the main screen. If mA and a ratio has been
selected then the large Iand the current clamp symbol light up. If mV and a
ratio has been selected then the large Uand the current clamp symbol are
displayed. The main display shows the scaled value in Amps.
For safety reasons, if switching out of the mA position the ratio screen turns
back to the default which is mA and a 1:1 ratio for direct current
measurement.
 Connect the measuring leads into the measuring circuit (at direct current
measurement) or clamp the external probe around the single live conductor.
The instrument displays in the main display the scaled Amps RMS value and
the frequency of the AC component in the small display.
To activate the LIMIT (alarm) function press the key. To set the lower limit
press the key again and use the to selects the digit and the key
to increment the digit. When in this mode pressing the first turns the lower
limit value off completely. To set the higher limit press the key and use the
arrow keys as above. To activate the LIMIT function press the key again.To
deactivate the LIMIT (alarm) function turn the rotary switch to a new position

Advanced functions
- 19 -
6 Advanced functions
6.1 Determining the Dielectric Absorption ratio Rab in
Insulation test
The Rab value is only available if the insulation test is continued for
more than 1 minute. The Rab value gives an indication of the quality
of the insulation. It is calculated using the following formula:
)30(
min)1(
sR
R
R
ISO
ISO
ab =
Measuring procedure:
Connect instrument to the installation/equipment with the
supplied test leads.
Select the required Insulation test voltage with the rotary switch.
Initiate the test by pressing the START key, hold this key down for 10
seconds to activate continuous measurement.
The test can be terminated anytime by pressing „START“ again.
(ATTENTION: The measuring voltage is applied all the time!).
While the test is in progress the annunciators
ACTIVE
are displayed
as a warning of the high tension at the measuring terminals.
After a minimum period of 1 minute indicated by frequence change of
the buzzer signal warning every 5 s the presence of high voltages.
The Rab value can be displayed using the key to select the Rab
screen.
The key toggles between Rab, the latest measured value of RISO
and the actual measuring voltage UISO.
Measured value evaluation :
Rab >1.25 means: good insulation and Rab < 1.1 signifies poor
insulation.
CAUTION: The installation / test specimen must be set potential-free
prior to measurement!
In case of external voltages above 10% of the selected test voltage
(10V, 25V, 50V and 100V) the measurement is blocked.

Advanced functions
- 20 -
6.1.1 Determining the Polarization Index Ip
The Ipvalue is only available if the insulation test is continued for
more than 10 minutes. This again is indicated by a frequence change
of the 5s buzzer alarm. The Ipvalue gives an indication of the qulaity
of the insulation. It is calculated using the following formula:
ΙpISO
ISO
R (10min)
R(1min)
=
Measuring procedure:
Connect instrument to the installation/equipment with the
supplied test leads.
Select the required Insulation test voltage with the rotary switch.
Initiate the test by pressing the START key, hold this key down for 10
seconds to activate continuous measurement.
The test can be terminated anytime by pressing „START“ again.
(ATTENTION: The measuring voltage is applied all the time!).
While the test is in progress the annunciators
ACTIVE
are displayed
as a warning of the high tension at the measuring terminals.
After a minimum period of 10 minutes indicated by a beep the Ipvalue
can be displayed using the key to select the Ipscreen.
The key toggles between Rab, Ip,the latest measured value of
RISO and the actual measuring voltage UISO.
Measured value evaluation :
Ip>2.0 means: good insulation and Ip< 1.5 signifies poor insulation.
CAUTION: The installation / test specimen must be set potential-free
prior to measurement!
In case of external voltages above 10% of the selected test voltage
(10V, 25V, 50V and 100V) the measurement is blocked.