METREL SigmaGT MI 3310 User manual

SigmaGT
MI 3310 / MI 3310A
Instruction Manual
Version: 2.2, HW 2, Code no. 20 751 946

2
Distributor:
Manufacturer:
Metrel d.d.
Ljubljanska cesta 77
SI-1354 Horjul
E-mail: [email protected]
http://www.metrel.si
© 2010 – 2013 Metrel
Mark on your equipment certifies that this equipment meets the requirements of the
EU (European Union) regulations concerning safety and electromagnetic
compatibility
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.

MI 3310 / MI 3310A SigmaGT Table of contents
3
1General description ............................................................................................7
1.1Warnings ...........................................................................................................8
1.2Warning markings on connector panel ..............................................................8
1.3Standards applied .............................................................................................8
1.4Battery and charging .......................................................................................10
1.5New battery cells or cells unused for a longer period ......................................10
2Instrument description .....................................................................................12
2.1Front panel ......................................................................................................12
2.2Connector panels ............................................................................................13
2.3Safety pre-tests ...............................................................................................14
2.4Warnings, messages and symbols..................................................................15
3Technical specifications...................................................................................20
3.1Earth bond resistance......................................................................................20
3.2Insulation resistance, Insulation – S resistance...............................................20
3.3Subleakage current, Subleakage – S current ..................................................21
3.4Differential leakage current..............................................................................21
3.5Power / Functional test....................................................................................21
3.6Touch leakage current.....................................................................................22
3.7Polarity test......................................................................................................22
3.8Clamp current..................................................................................................22
3.9PRCD and RCD testing...................................................................................23
3.9.1Portable RCD trip-out time/current...........................................................23
3.9.2General RCD Trip-out time/current...........................................................23
3.10Calibration unit – checkbox (optional) .............................................................24
3.11General data....................................................................................................24
4Main menu and test modes ..............................................................................26
4.1Help menus .....................................................................................................26
4.2Instrument main menu.....................................................................................27
4.2.1Autotest organizer menu..........................................................................27
4.2.2Autotest custom menu..............................................................................28
4.2.3Project autotests menu.............................................................................29
4.2.3Barcode / TAG menu................................................................................29
4.2.4Single test menu.......................................................................................29
4.2.5Edit appliance data menu.........................................................................30
4.2.5.1Users submenu ............................................................................................... 30
4.2.5.1.1Item editing menu........................................................................................ 31
4.2.5.2Device submenu ............................................................................................. 31
4.2.5.3Test sites submenu ......................................................................................... 32
4.2.5.4Locations submenu ......................................................................................... 32
4.2.6Recall / delete / send memory menu........................................................33
4.2.7Upload data / edit lists / check log menu..................................................33
4.2.8Setup menu..............................................................................................33
4.2.8.1Setting date and time ...................................................................................... 34
4.2.8.2Language selection ......................................................................................... 35
4.2.8.3Print header..................................................................................................... 35
4.2.8.4Viewing of instrument data.............................................................................. 36
4.2.8.5Display contrast adjustment ............................................................................ 36
4.2.8.6Instrument settings.......................................................................................... 37

MI 3310 / MI 3310A SigmaGT Table of contents
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4.2.8.7Reset instrument settings................................................................................ 38
4.2.8.8Communication settings.................................................................................. 39
4.2.8.9Password ........................................................................................................ 41
4.2.8.10Calibration unit – checkbox (optional) ......................................................... 42
5Single tests ........................................................................................................45
5.1Performing measurements in single test mode ...............................................45
5.2Measurements – Single tests for appliances ...................................................46
5.2.1Earth bond resistance ..............................................................................46
5.2.1.1Compensation of test leads resistance (firmware release 1.24 and up) ......... 47
5.2.2Insulation resistance.................................................................................47
5.2.3Insulation resistance – S probe................................................................50
5.2.4Substitute leakage current........................................................................52
5.2.5Substitute leakage – S probe...................................................................54
5.2.6Differential leakage current ......................................................................56
5.2.7Touch leakage current..............................................................................57
5.2.8Polarity test ..............................................................................................59
5.2.9Clamp current test....................................................................................60
5.2.10RCD/PRCD test........................................................................................63
5.2.10.1RCD single test ........................................................................................... 64
5.2.10.2Automatic RCD test..................................................................................... 64
5.2.11Functional test..........................................................................................66
5.3Measurements – Single tests for welding machines........................................68
5.3.1Continuity of the protective circuit ............................................................68
5.3.2Insulation resistance (supply circuit to protective circuit)..........................69
5.3.3Insulation resistance (welding circuit to protective circuit)........................70
5.3.4Insulation resistance (supply circuit to welding circuit).............................71
5.3.5Insulation resistance (supply circuit of class II equipment to accessible
surfaces).................................................................................................................72
5.3.6Welding circuit leakage current ................................................................73
5.3.7Primary leakage current...........................................................................74
5.3.8Touch leakage current..............................................................................75
5.3.9No load voltage ........................................................................................75
5.3.10Clamp current test....................................................................................76
5.3.11Functional test..........................................................................................76
6Autotest sequences ..........................................................................................77
6.1Autotest organizer– general menu ..................................................................77
6.1.1Autotest organizer operation....................................................................79
6.1.2Example of creating a test sequence with autotest organizer ..................80
6.2Custom autotests ............................................................................................81
6.2.1Viewing, modifying and saving an custom autotest..................................82
6.2.1.1Modification of an autotest sequence.............................................................. 82
6.2.1.2Saving autotest sequences ............................................................................. 83
6.2.2Deleting an existing custom test sequence..............................................84
6.3Project autotests..............................................................................................84
6.3.1Selecting a project autotest......................................................................85
6.3.2Starting a project autotest ........................................................................87
6.3.3Comparison of results (evaluation of result trends)..................................88
6.4Working with barcode / RFID tag.....................................................................89
6.4.1Working with RFID tags............................................................................90

MI 3310 / MI 3310A SigmaGT Table of contents
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6.4.2Reading autotest code from barcode / QR code......................................92
6.4.3Reading barcode for working with results.................................................92
6.5Performing autotest sequences – for appliances.............................................93
6.5.1Visual inspection ......................................................................................93
6.5.2Earth bond resistance measurement........................................................94
6.5.3Insulation resistance measurement..........................................................94
6.5.4Insulation resistance – S probe measurement.........................................95
6.5.5Substitute leakage current measurement.................................................95
6.5.6Substitute leakage – S probe measurement ............................................96
6.5.7Differential leakage current ......................................................................97
6.5.8Touch leakage current measurement.......................................................97
6.5.9Polarity test ..............................................................................................98
6.5.10TRMS current measurement using clamp current adapter.......................98
6.5.11RCD/PRCD test........................................................................................99
6.5.12Functional test..........................................................................................99
6.6Performing autotest sequences – for welding machines ..............................101
6.6.1Visual inspection ....................................................................................101
6.6.2Continuity of the protective circuit ..........................................................101
6.6.3Insulation resistance (supply circuit to protective circuit)........................102
6.6.4Insulation resistance (welding circuit to protective circuit)......................103
6.6.5Insulation resistance (supply circuit to welding circuit)...........................103
6.6.6Insulation resistance (supply circuit of class II equipment to accessible
surfaces)...............................................................................................................104
6.6.7Welding circuit leakage current ..............................................................105
6.6.8Primary leakage current.........................................................................105
6.6.9Touch leakage current............................................................................106
6.6.10No load voltage ......................................................................................107
6.6.11TRMS current measurement using clamp current adapter.....................107
6.6.12Functional test........................................................................................107
7Working with autotest results ........................................................................108
7.1Saving autotest results ..................................................................................108
7.2Recalling results ............................................................................................109
7.3Deleting results..............................................................................................111
7.4Downloading and printing results ..................................................................112
7.4.1Send to serial printer..............................................................................113
7.4.1Send to barcode / QR code printer........................................................113
7.5Data upload / download.................................................................................115
8Maintenance ....................................................................................................116
8.1Periodic calibration ........................................................................................116
8.2Fuses.............................................................................................................116
8.3Service ..........................................................................................................116
8.4Cleaning ........................................................................................................116
9Instrument set and accessories.....................................................................117
Appendix A – Preprogrammed autotests ................................................................118
Appendix B – Autotest shortcut codes....................................................................127
Appendix C – Country notes.....................................................................................129

MI 3310 / MI 3310A SigmaGT Table of contents
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C.1 List of country modifications ..............................................................................129
F.2 Modification issues - NL.....................................................................................129
F.2.1 Autotest organizer .......................................................................................129
F.2.2Example of creating a test sequence with autotest organizer ................130
F.2.3 Autotest codes.............................................................................................132

MI 3310 / MI 3310A SigmaGT General description
7
1 General description
The multifunctional portable test instrument SigmaGT is intended to perform all
measurements for testing the electrical safety of portable electrical equipment. The
following tests can be performed:
- Earth bond / continuity resistance,
- Insulation resistance,
- Insulation resistance of isolated accessible conductive parts,
- Substitute leakage current,
- Substitute leakage current of isolated accessible conductive parts,
- Differential leakage current,
- Touch leakage current,
- IEC cord polarity test,
- Leakage and TRMS load currents with current clamp,
- Portable RCD test,
- RCD test,
- Functional test.
The instrument has a powerful test data management system. Autotests and single
tests can be stored (depending on the application) in approx. 6000 memory locations.
Some instrument's highlights:
- Large graphic LCD display with resolution of 240 128 dots, with back-light,
- Over 6000 memory locations in data flash memory for storing test results &
parameters,
- Three communication ports (USB and 2 x RS232C) for communication with PC,
barcode reader, RFID reader/writer and printers,
- Bluetooth communication with external printer, barcode reader, PC and Android
mobile devices (MI 3310A only),
- Soft touch keyboard with cursor keys,
- Built in real time clock,
- Built in calibration unit – checkbox (optional),
- Fully compatible with new METREL PATLink PRO PC software package.
Powerful functions for fast and efficient periodic testing are included:
- Pre-programmed test sequences,
- Fast testing with barcode, QR code and/or RFID tag identification systems,
- Test data can be uploaded from PC,
- Comparisons between old and new test results can be performed on site,
- Enables on site printing of test labels.
The operation of the unit is clear and simple – the operator does not need any special
training (except reading this instruction manual) to operate the instrument.

MI 3310 / MI 3310A SigmaGT General description
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1.1 Warnings
In order to reach high level of operator safety while carrying out various measurements
using SigmaGT instrument, as well as to keep the test equipment undamaged, it is
necessary to consider the following general warnings:
Read this user manual carefully, otherwise use of the instrument may be
dangerous for the operator, for the instrument or for the equipment under test!
Warning on the instrument means »Read the Instruction manual with
special care to safety operation«. The symbol requires an action!
If the test equipment is used in manner not specified in this user manual the
protection provided by the equipment may be impaired!
Do not use the instrument and accessories if any damage is noticed!
Consider all generally known precautions in order to avoid risk of electric
shock while dealing with hazardous voltages!
Do not use the instrument in supply systems with voltages higher than
CAT II 300 V!
Do not connect any external voltage on test terminals! Some test terminals are
connected to functional earth during measurements. Possible hazard of
electric shock!
Use only standard or optional test accessories supplied by your distributor!
Use only correctly earthed mains outlets to supply the instrument!
In case a fuse has blown follow the instructions in this user manual to replace
it!
Instrument servicing and calibration is allowed to be carried out only by a
competent authorized person!
It is advisable not to run tested devices with load currents above 13 A for
more than 15 minutes. Load currents higher than 13 A can result in high
temperatures of main supply connector and fuse holders!
Instrument contains rechargeable NiCd or NiMh battery cells. The cells should
only be replaced with the same type as defined on the battery placement label
or in this manual. Do not use standard alkaline battery cells while power
supply cable is connected, otherwise they may explode!
If a test code with an earth bond test current not supported by the instrument
is selected the SigmaGT instrument will automatically perform the earth bond
test with lower test current (200 mA or 10 A). The operator must be competent
to decide if performing the test with lower test current is acceptable!
1.2 Warning markings on connector panel
Refer to chapters 2.1 Front panel and 2.2 Connector panels.
1.3 Standards applied
The SigmaGT instrument is manufactured and tested according to the following
regulations, listed below.

MI 3310 / MI 3310A SigmaGT General description
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Electromagnetic compatibility (EMC)
EN 61326-1 Electrical equipment for measurement, control and laboratory use -
EMC requirements -- Part 1: General requirements
Class B (Portable equipment used in controlled EM environments)
Safety (LVD)
EN 61010-1 Safety requirements for electrical equipment for measurement,
control, and laboratory use – Part 1: General requirements
EN 61010-2-030 Safety requirements for electrical equipment for measurement, control
and laboratory use – Part 2-030: Particular requirements for testing
and measuring circuits
EN 61010-031 Safety requirements for electrical equipment for measurement, control
and laboratory use - Part 031: Safety requirements for hand-held
probe assemblies for electrical measurement and test
EN 61010-2-032 Safety requirements for electrical equipment for measurement,
control, and laboratory use - Part 2-032: Particular requirements for
hand-held and hand-manipulated current sensors for electrical test
and measurement
Functionality
VDE 0404-1 Testing and measuring equipment for checking the electric safety of
electric devices - Part 1: General requirements
VDE 0404-2 Testing and measuring equipment for checking the electric safety of
electric devices - Part 2: Testing equipment for tests after repair,
change or in the case of repeat tests
VDE 0701-0702 Inspection after repair, modification of electrical appliances –
Periodic inspection on electrical appliances
General requirements for electrical safety
EN 60204-1 Ed.5 Safety of machinery - Electrical equipment of machines - Part 1:
General requirements
EN 60439 Low-voltage switchgear and controlgear assemblies
EN 61439-1 Low-voltage switchgear and controlgear assemblies - Part 1:
General rules
AS / NZS 3760 In-service safety inspection and testing of electrical equipment
NEN 3140 Operation of electrical installations - Additional Netherlands
requirements for low-voltage installations
Note about EN and IEC standards:
Text of this manual contains references to European standards. All standards of EN
6xxxx (e.g. EN 61010) series are equivalent to IEC standards with the same number
(e.g. IEC 61010) and differ only in amended parts required by European harmonization
procedure.
Note:
Various devices and appliances can be tested by SigmaGT and in further text the
common DUT (abbreviation for Device Under Test) is applied.

MI 3310 / MI 3310A SigmaGT General description
10
1.4 Battery and charging
The instrument uses six C size alkaline or rechargeable Ni-Cd or Ni-MH battery cells.
Battery condition is always displayed in the lower right display part.
In case the battery is too weak the instrument indicates this as shown in below. This
indication appears for a few seconds and then the instrument turns itself off.
Discharged battery indication
The battery is charged whenever the instrument is connected to mains voltage. The
instrument automatically recognizes the connection to the mains voltage and begins
charging. Internal circuit controls charging and assures maximum battery lifetime.
Indications of battery charging
When connected to an installation, the instruments battery compartment
can contain hazardous voltage inside! Before opening battery compartment
cover, disconnect all accessories connected to the instrument and switch off
the instrument.
Ensure that the battery cells are inserted correctly otherwise the instrument
will not operate and the batteries could be discharged.
If the instrument is not to be used for a long period of time, remove all
batteries from the battery compartment.
Alkaline or rechargeable Ni-Cd or Ni-MH batteries (size C) can be used. Metrel
recommends only using rechargeable batteries with a capacity of 4000 mAh or
higher.
Do not recharge alkaline battery cells!
1.5 New battery cells or cells unused for a longer period
Unpredictable chemical processes can occur during the charging of new battery cells or
cells that have been left unused for a longer period (more than 3 months). Ni-MH and
Ni-Cd cells can be subjected to these chemical effects (sometimes called the memory
effect). As a result the instrument operation time can be significantly reduced during the
initial charging/discharging cycles of the batteries.
In this situation, Metrel recommend the following procedure to improve the battery
lifetime:
Procedure Notes
Completely charge the battery. At least 14h with in-built charger.
Completely discharge the battery.
This can be performed by using the
instrument normally, until the instrument is
fully discharged.

MI 3310 / MI 3310A SigmaGT General description
11
Repeat the charge / discharge cycle
at least 2-4 times.
Four cycles are recommended in order to
restore the batteries to their normal capacity.
Notes:
The charger in the instrument is a pack cell charger. This means that the battery
cells are connected in series during the charging. The battery cells have to be
equivalent (same charge condition, same type and age).
One different battery cell can cause an improper charging and incorrect discharging
during normal usage of the entire battery pack (it results in heating of the battery
pack, significantly decreased operation time, reversed polarity of defective cell…).
If no improvement is achieved after several charge / discharge cycles, then each
battery cell should be checked (by comparing battery voltages, testing them in a cell
charger, etc). It is very likely that only some of the battery cells are deteriorated.
The effects described above should not be confused with the normal decrease of
battery capacity over time. Battery also loses some capacity when it is repeatedly
charged / discharged. Actual decreasing of capacity, versus number of charging cycles,
depends on battery type. This information is provided in the technical specification from
battery manufacturer.

MI 3310 / MI 3310A SigmaGT Instrument description
12
2 Instrument description
2.1 Front panel
Front panel
Legend:
1 240 128 dots graphic matrix display with backlight
2 Function keys intended for displayed defined options.
3 ESCAPE key
4 HELP key
5 ON / OFF key
To switch off the instrument press and hold ON/OFF key for about 2 seconds.
6 Cursor keys and ENTER key
7 SEND key
8 START / STOP key
9 Test probe EB/S, used as output for earth bond test and probe input in for class 2
equipment tests (insulation resistance – S, substitute leakage – S, and touch
leakage currents).
10 Alpha-numeric keyboard
11 LN and PE sockets for testing the insulation resistance and substitute leakage
current of fixed installed DUTs.

MI 3310 / MI 3310A SigmaGT Instrument description
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Warning!
These sockets are intended only for the connection to de-energized
devices.
12 Test socket
Warning!
Dangerous voltage is present on the test socket during the measurement.
Maximum output current is 16 A, test only devices with maximum rated
supply current no higher than 16 A!
Note:
For devices incorporated high reactive loading, e.g. motor with rated power >
1.5 kW, it is recommended to start measurement first and to turn on the tested
device later.
13 IEC appliance connector for testing supply cords
Warning!
The connector input is for test purpose only; do not connect it to the
mains supply!
2.2 Connector panels
Left side connector panel
14 Two T16 A / 250 V fuses for instrument protection
15 Mains supply connector
16 Battery compartment cover
17 Fastening screw for battery compartment cover
Warning!
Disconnect all accessory and tested equipment before opening the
battery cover!

MI 3310 / MI 3310A SigmaGT Instrument description
14
Right side connector panel
18 Current clamp adapter input sockets
Warnings!
Do not connect any voltage source on this input. It is intended only for
connection of current clamp with current output. Maximum input current
is 30 mA!
Green socket is connected to the functional earth of the system and is
intended for connection with shield of current clamp only.
19 USB connector
20 Barcode reader connector
21 PC / PRINTER connector
22 Checkbox input sockets (optional)
Warning!
Do not connect any voltage source on these inputs. They are intended
only for connection to the test instrument as described in this manual
for the purpose of checkbox test.
2.3 Safety pre-tests
Before performing a measurement, the instrument performs a series of pre-tests to
ensure safety and to prevent any damage. These safety pre-tests are checking for:
- Any external voltage against earth on mains test socket,
- Excessively high leakage current,
- Excessively high touch leakage current,
- Short circuit or too low resistance between L and N of tested device,
- Correct input mains voltage,
- Input PE connection.
If pre-tests fail, an appropriate warning message will be displayed.
The warnings and measures are described in chapter 2.4 Warnings, messages and
symbols.

MI 3310 / MI 3310A SigmaGT Instrument description
15
2.4 Warnings, messages and symbols
Warnings and messages
Mains voltage is not
correct or PE not
connected.
Check mains voltage
and PE connection!
Warning for improper supply voltage condition. Possible
causes:
- No earth connection or other wiring problem on
supply socket.
- Incorrect mains voltage.
Determine and eliminate the problem before proceeding!
Warning:
- The instrument must be earthed properly!
No mains voltage.
Connect PAT to mains
voltage.
Instrument not connected to the mains supply voltage.
For some measurements like differential / touch leakage
tests, PRCD / RCD tests and active polarity, operating the
instrument from mains voltage is required.
Connect the instrument to the mains voltage and start
selected test again.
L – N resistance too
high (>30 k)!
Check fuse and
switch.
Are you sure to
proceed (Y/N)?
An excessively high resistance was measured in the fuse
pre-test. Indication means that tested device has too low
consumption or is:
- Not connected,
- Switched off,
- Contains a fuse that has blown.
Select YES or NO with Y or N key.
Resistance L – N low!
Are you sure to
proceed (Y/N)?
A low resistance of the device under test (DUT) supply input
was measured in the pre-test. This means that it is very
likely that an excessively high current will flow after applying
power to the DUT. If the high current is only of short duration
(caused by a short inrush current) the test can be performed,
otherwise not.
Select YES or NO with Y or N key.
Resistance L – N too
low!
Are you sure to
proceed (Y/N)?
An extremely low resistance of the DUT supply input was
measured in the pre-test. It is likely that fuses will blow after
applying power to the DUT. If the too high current is only of
short duration (caused by a short inrush current) the test can
be performed otherwise it must be stopped.
Select YES or NO with Y or N key.
It is recommended to additionally check the DUT before
proceeding with the test!

MI 3310 / MI 3310A SigmaGT Instrument description
16
Leakage LN-PE high!
Are you sure to
proceed (Y/N)?
Dangerous leakage current (higher than 3.5 mA) will flow if
power would be connected to DUT.
Select YES or NO with Y or N key.
Proceed with testing only if all safety measures have been
taken. It is recommended to perform a thorough earth bond
test on the PE of the DUT before proceeding with the test.
Leakage LN-PE too
high!
Are you sure to
proceed (Y/N)?
Dangerous leakage current (higher than 20 mA) will flow if
power would be connected to the DUT.
Determine and eliminate the problem before proceeding!
Leakage LN-PE or
EB/S too high!
Are you sure to
proceed (Y/N)?
Dangerous leakage current (higher than 20 mA) would flow if
power were connected to the DUT.
Select YES or NO with Y or N key.
Proceed with testing only if all safety measures have been
taken.
It is recommended to perform a thorough earth bond test on
the PE of the DUT before proceeding with the test.
External voltage on
test socket too high!
DANGER!
- Voltage on mains test socket or LN/PE terminals
is higher than approximately 25 V (AC or DC)!
Disconnect the DUT from the instrument immediately and
determine why external voltage was detected!
External voltage on
EB/S too high!
DANGER!
- Voltage on test probe (EB/S) is higher than
approximately 25 V (AC or DC)!
Disconnect the test probe from the DUT and determine why
external voltage was detected!
Next test was skipped
for safety! Check the
device.
Instrument skipped the required test because of a failed
previous test.
Overheated!
Temperature of internal components of the instrument
reached their top limit. Measurement is prohibited until the
internal temperature has reduced.

MI 3310 / MI 3310A SigmaGT Instrument description
17
Warning!
More than 80 % of
memory is occupied.
Stored data should be
downloaded to PC.
Instrument memory is almost full. Download stored results to
PC.
Warning!
Calibration has been
expired.
Recalibration of the instrument is required. Contact your
dealer.
Measurement aborted,
contact voltage too
high (> 50V).
A too high contact voltage was detected before an RCD test
being carried out. Check PE connections!
Hardware error.
Return the instrument
to the repair centre.
The instrument detects a serious failure.

MI 3310 / MI 3310A SigmaGT Instrument description
18
Warning symbols
Remove the EB/S connection, especially if it is connected to
any part that will begin to rotate or move when power is
applied.
Connect the test lead to the EB/S test socket.
Warning!
A high voltage is / will be present on the instrument output!
(Insulation test voltage, or mains voltage).
The DUT should be switched on (to ensure that the complete
circuit is tested).
Connect the lead to be tested to the IEC test terminal.
Connect current clamp adapter in this test.
PASS /FAIL indication
Test passed.
Test failed.
Some tests in the autotest sequence were skipped, but all
performed tests passed.

MI 3310 / MI 3310A SigmaGT Instrument description
19
Battery and mains supply indication
Battery capacity indication.
Low battery! Battery is too weak to guarantee correct result.
Replace or recharge battery cells.
Instrument connected to the mains supply voltage. When
instrument is in idle mode recharging process is in progress.
Recharging in progress (if instrument is connected to the
mains supply voltage).
Bluetooth indication (optional)
Bluetooth communication is enabled. Remote device
(printer, barcode reader, PC or Android mobile device) can
now be connected with the instrument.
Remote Bluetooth device (printer, barcode reader, PC or
Android mobile device) is connected with the instrument.
Searching for Bluetooth devices or connecting procedure
with the selected Bluetooth device (printer, barcode reader,
PC or Android mobile device).
Alpha-numeric entry indication
When using alpha-numeric keyboard, entry type can be selected by using SHIFT key.
1A Alpha-numeric caps entry (excluding special alphabet
characters)
1Ä Alpha-numeric caps entry (including special alphabet
characters)
:ä Special characters and small caps alphabetic entry
(including special alphabet characters)

MI 3310 / MI 3310A SigmaGT Technical specifications
20
3 Technical specifications
3.1 Earth bond resistance
Test current set to 10 A (MI 3310A only)
Range Resolution Accuracy
0.00 1.99 0.01 (5 % of reading + 3 digits)
2.00 19.99 0.01 10 %
Test current set to 200 mA
Range Resolution Accuracy
0.00 1.99 0.01 (5 % of reading + 3 digits)
2.00 9.99 0.01 10 %
10.0 19.9 0.1 10 %
Powered by:.....................battery or mains for 200 mA test
mains for 10 A test
Test currents:...................10 A (5 %) into 100 mat mains voltage of 230 V
200 mA into 2.00 
Open circuit voltage:........<9 V AC
Test lead compensation...up to 5 
Lead calibration: ..............no
Pass levels []:................0.10 0.90, 1.00 9.00
Test duration [s]:..............2, 3, 5, 10, 30
Test method:....................2-wire measurement, floating to earth
Test terminals: .................EB/S test probe – test socket (PE terminal)
EB/S test probe – PE test probe (test current 200 mA only)
3.2 Insulation resistance, Insulation – S resistance
Insulation resistance
Range Resolution Accuracy
0.000 M0.500 M0.001 M(10 % of reading + 5 digits)
0.501 M1.999 M0.001 M
(5 % of reading + 3 digits)
2.00 M19.99 M0.01 M
20.0 M199.9 M0.1 M
Insulation – S resistance
Range Resolution Accuracy
0.000 M0.500 M0.001 M(10 % of reading + 5 digits)
0.501 M1.999 M0.001 M(5 % of reading + 3 digits)
2.00 M19.99 M0.01 M