METREL EasiPLUS MI 3000 User manual

EasiPLUS

MI 3000

Instruction manual

Version 1.0, HW 3; Code No. 20 752 201

Distributor:

Manufacturer:

METREL d.d.

Ljubljanska cesta 77

1354 Horjul

Slovenia

web site: http://www.metrel.si

e-mail: [email protected]

Mark on your equipment certifies that this equipment meets the requirements of the EU

(European Union) concerning safety and interference causing equipment regulations.

No part of this publication may be reproduced or utilized in any form or by any means

without permission in writing from METREL.

2

MI 3000 EasiPLUS Table of contents

3

1 ......................................................................................................... 5 Preface

2 ..................................................... 6 Safety and operational considerations

2.1 .................................................................................... 6 Warnings and notes

2.2 ..................................................................................................... 9 Batteries

2.3 ..................................................................................................... 9 Charging

2.4

......................................................................................................... 9

Precautions on charging of new battery cells or cells unused for a longer

period

2.5 ..................................................................................... 11 Standards applied

3 ............................................................................. 12 Instrument description

3.1 ............................................................................................... 12 Front panel

3.2 ................................................................................................ 14 Back panel

3.3 .............................................................................................. 15 Bottom view

3.4 ............................................................................ 16 Carrying the instrument

4 ................................................................................ 17 Instrument operation

4.1

.......................... 17

Meaning of symbols and messages on the instrument display

4.1.1 ................................... 17 The online voltage and output terminal monitor

4.1.2 .............................................................. 18 Message field – battery status

4.1.3 ............................. 18 Message field – measurement warnings/messages

4.1.4 ........................................................................................... 19 Result field

4.1.5 ................................................................................... 19 Other messages

4.1.6 .................................................................................... 19 Sound warnings

4.1.7 ................................................................. 20 Function and parameter line

4.2 .......................................... 20 Selecting measurement function/ subfunction

4.3 ............................................ 20 Setting measurement parameters and limits

4.4 ................................................................................................ 20 Help menu

4.5 .............................................................................................. 21 Setup menu

4.5.1 ............................................................................ 21 Supply system setup

4.5.2 ................................................... 22 Impedance scaling factor adjustment

4.5.3

.............................................................................. 22 Language selection

4.5.4 ............................................................. 22 Plug / Tip commander support

4.5.5

..................................................................... 23 Recalling original settings

4.6

...................................................................... 23 Display contrast adjustment

5

........................................................................................... 24 Measurements

5.1 ................................................................................. 24 Insulation resistance

5.2

.................................................................................................. 26 Continuity

5.2.1

.......................................................................................... 26 R Low test

5.2.2 .................................................................... 28 Low current continuity test

5.3 ........................................................................................... 30 Testing RCDs

5.3.1 ............................................................................. 30 Limit contact voltage

5.3.2 ...................................................... 30 Nominal differential trip-out current

5.3.3 .................................................... 30 Multiplier of nominal residual current

5.3.4

........................................... 30 RCD type and test current starting polarity

5.3.5

................................................ 31 Testing selective (time-delayed) RCDs

5.3.6 .................................................................................... 31 Contact voltage

5.3.7 ......................................................................................... 33 Trip-out time

5.3.8 ..................................................................................... 34 Trip-out current

5.3.9 ................................................................................................ 36 Autotest

5.4 ................................. 39 Fault loop impedance and prospective fault current

MI 3000 EasiPLUS Table of contents

4

5.4.1 ........................................................................... 39 Fault loop impedance

5.4.2 .................... 41 The fault loop impedance test for RCD protected circuits

5.5 .............................. 43 Line impedance and prospective short-circuit current

5.6 ........................................................................... 45 Phase sequence testing

5.7 .............................................................................. 46 Voltage and frequency

5.8 ............................................................................ 48 Testing the PE terminal

6 ............................................................................................... 50 Maintenance

6.1 ........................................................................................ 50 Replacing fuses

6.2

................................................................................................... 50 Cleaning

6.3

................................................................................... 50 Periodic calibration

6.4 ...................................................................................................... 50 Service

7 ........................................................................... 51 Technical specifications

7.1 ................................................................................. 51 Insulation resistance

7.2

................................................................................ 51 Continuity resistance

7.2.1

.................................................................................................... 51 Low

7.2.2

.......................................................................... 52 Low current continuity

7.3

.............................................................................................. 52 RCD testing

7.3.1 ........................................................................................ 52 General data

7.3.2 .................................................................................... 53 Contact voltage

7.3.3 ......................................................................................... 53 Trip-out time

7.3.4 ..................................................................................... 53 Trip-out current

7.4 ................................. 54 Fault loop impedance and prospective fault current

7.5 .............................. 55 Line impedance and prospective short-circuit current

7.6 .......................................................................................... 55 Phase rotation

7.7 .............................................................................. 55 Voltage and frequency

7.8 .............................................................................. 56 Online voltage monitor

7.9 ............................................................................................. 56 General data

A ....................................................................................... 57 Fuse base tables

B ..................................................................................... 58 IT supply systems

C ..................................................... 62 Reduced low voltage supply systems

MI 3000 EasiPLUS Preface

5

1 Preface

Congratulations on your purchase of the EasiPLUS instrument and its accessories from

METREL. The instrument was designed on a basis of rich experience, acquired through

many years of dealing with electric installation test equipment.

The EasiPLUS instrument is professional, multifunctional, hand-held test instrument

intended to perform all the measurements required in order for a total inspection of

electrical installations in buildings. The following measurements and tests can be

performed:

 Voltage and frequency,

 Continuity tests,

 Insulation resistance tests,

 RCD testing,

 Fault loop / RCD trip-lock impedance measurements,

 Line impedance,

 Phase sequence,

The large graphic matrix display with backlight offers easy to read results, indications,

measurement parameters and messages. The operation of the instrument is designed

to be as simple and clear as possible and no special training (except for the reading this

instruction manual) is required in order to begin using the instrument.

To become more familiar with how to perform measurements in general and in typical

applications, we recommend reading Metrel handbook Measurements on electric

installations in theory and practice.

The instrument is equipped with all accessories required in order to perform testing

comfortably. The soft carrying bag, included with the meter, protect the instrument and

keep all accessories together making it simple and easy to move between locations.

MI 3000 EasiPLUS Safety and operational considerations

6

2 Safety and operational considerations

2.1 Warnings and notes

In order to maintain the highest level of operator safety while carrying out various tests

and measurements, Metrel recommends keeping your EasiPLUS instruments in good

condition and undamaged.. When using the instrument, consider the following general

warnings:

 The symbol on the instrument means »Read the Instruction manual

with special care for safe operation«. The symbol requires an action!

 If the test equipment is used in a manner not specified in this user manual,

the protection provided by the equipment could be impaired!

 Read this user manual carefully, otherwise the use of the instrument may

be dangerous for the operator, the instrument or for the equipment under

test!

 Do not use the instrument or any of the accessories if any damage is

noticed!

 If a fuse blows in the instrument, follow the instructions in this manual in

order to replace it!

 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

550 V!

 Service intervention or adjustment is only allowed to be carried out by a

competent authorized personnel!

 Use only standard or optional test accessories supplied by your

distributor!

 Consider that older accessories and some of the new optional test

accessories compatible with this instrument only meet CAT III / 300 V

overvoltage safety rating! This means that maximal allowed voltage

between test terminals and ground is 300 V!

 The instrument comes supplied with rechargeable Ni-Cd or Ni-MH battery

cells. The cells should only be replaced with the same type as defined on

the battery compartment label or as described in this manual. Do not use

standard alkaline battery cells while the power supply adapter is

connected, otherwise they may explode!

 Hazardous voltages exist inside the instrument. Disconnect all test leads,

remove the power supply cable and switch off the instrument before

removing battery compartment cover.

 All normal safety precautions must be taken in order to avoid risk of

electric shock while working on electrical installations!

MI 3000 EasiPLUS Safety and operational considerations

7

Warnings related to measurement functions

Insulation resistance

 Insulation resistance measurement should only be performed on de-energized

objects!

 When measuring the insulation resistance between installation conductors, all

loads must be disconnected and all switches closed!

 Do not touch the test object during the measurement or before it is fully

discharged! Risk of electric shock!

 When an insulation resistance measurement has been performed on a capacitive

object, automatic discharge may not be done immediately! The warning message

and the actual voltage is displayed during discharge until voltage drops below

10 V.

 Do not connect test terminals to external voltage higher than 550 V (AC or DC) in

order not to damage the test instrument!

Continuity functions

 Continuity measurements should only be performed on de-energized objects!

 Parallel impedances or transient currents may influence test results.

Testing PE terminal

 If phase voltage is detected on the tested PE terminal, stop all measurements

immediately and ensure the cause of the fault is eliminated before proceeding

with any activity!

Notes related to measurement functions

General

 The indicator means that the selected measurement cannot be performed

because of irregular conditions on input terminals.

 Insulation resistance, continuity functions and earth resistance measurements

can only be performed on de-energized objects.

 PASS / FAIL indication is enabled when limit is set. Apply appropriate limit value

for evaluation of measurement results.

 In the case that only two of the three wires are connected to the electrical

installation under test, only voltage indication between these two wires is valid.

Insulation resistance

 If voltages of higher than 10 V (AC or DC) are detected between test terminals,

the insulation resistance measurement will not be performed.

Continuity functions

 If voltages of higher than 10 V (AC or DC) are detected between test terminals,

the continuity resistance test will not be performed.

 Before performing a continuity measurement, where necessary, compensate test

lead resistance.

MI 3000 EasiPLUS Safety and operational considerations

8

RCD functions

 Parameters set in one function are also kept for other RCD functions!

 The measurement of contact voltage does not normally trip an RCD. However,

the trip limit of the RCD may be exceeded as a result of leakage current flowing

to the PE protective conductor or a capacitive connection between L and PE

conductors.

 The RCD trip-lock sub-function (function selector switch in LOOP position) takes

longer to complete but offers much better accuracy of fault loop resistance (in

comparison to the R

L

sub-result in Contact voltage function).

 RCD trip-out time and RCD trip-out current measurements will only be performed

if the contact voltage in the pre-test at nominal differential current is lower than

the set contact voltage limit!

 The autotest sequence (RCD AUTO function) stops when trip-out time is out of

allowable time period.

Fault loop / RCD trip-lock impedance

 The low limit prospective short-circuit current value depends on fuse type, fuse

current rating, fuse trip-out time and impedance scaling factor.

 The specified accuracy of tested parameters is valid only if the mains voltage is

stable during the measurement.

 Fault loop impedance measurements will trip an RCD.

 The measurement of fault loop impedance using trip-lock function does not

normally trip an RCD. However, the trip limit may be exceeded as a result of

leakage current flowing to the PE protective conductor or a capacitive connection

between L and PE conductors.

Line impedance

 The low limit prospective short-circuit current value depends on fuse type, fuse

current rating, fuse trip-out time and impedance scaling factor.

 The specified accuracy of tested parameters is valid only if the mains voltage is

stable during the measurement.

MI 3000 EasiPLUS Safety and operational considerations

9

Testing the PE terminal

 The PE terminal can only be tested in the RCD, LOOP and LINE functions!

 For correct testing of PE terminal, the TEST key has to be touched for a few

seconds.

 Make sure to stand on non-isolated floor while carrying out the test, otherwise the

test result may be wrong!

2.2 Batteries

 When connected to an installation, the instruments battery compartment can

contain hazardous voltage inside! When replacing battery cells or before

opening the battery/fuse compartment cover, disconnect any measuring

accessory connected to the instrument and turn 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 AA) can be used. Metrel

recommends only using rechargeable batteries with a capacity of 2100mAh or

above.

 Do not recharge alkaline battery cells!

2.3 Charging

The batteries will begin charging whenever the power supply adapter is connected to

the instrument. The built-in protection circuits control the charging procedure and assure

maximum battery lifetime. The power supply socket polarity is shown in figure 2.1.

+

-

Figure 2.1: Power supply socket polarity

Note:

 Use only power supply adapter delivered from the manufacturer or distributor of

the test equipment to avoid possible fire or electric shock!

2.4 Precautions on charging of 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 long periods of time (more than 3 months). Ni-MH

and Ni-Cd cells can be subject 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.

MI 3000 EasiPLUS Safety and operational considerations

10

In this situation, Metrel recommend the following procedure to improve the battery

lifetime:

 Completely charge the batteries for at least 14h via the instrument built-in

charger.

 Completely discharge the batteries (this can be performed by using the

instrument normally until the instrument is fully discharged).

 Repeat the charge/discharge cycle at least 2-4 times in order to restore the

batteries to their normal capacity..

When using an external intelligent battery charger, one complete discharging/charging

cycle can be performed automatically. After performing this procedure, a normal battery

capacity should be fully restored and the operating time of the instrument will

approximately meet the data set out in the in the technical specification.

Notes:

 The charger in the instrument is a pack cell charger. This means that the cells

are connected in series during the charging so all of them must be in similar state

(similarly charged, same type and age).

 If even one deteriorated battery cell (or just one of a different type e.g. capacity,

chemical design) can cause disrupted charging of the entire battery pack which

could lead to overheating of the battery pack and a significant decrease in the

operating time.

 If no improvement is achieved after performing several charging/discharging

cycles, the state of each individual battery cells should be determined (by

comparing battery voltages, checking them in a cell charger, etc). It is very likely

that one or more of the battery cells could have deteriorated.

 The effects described above should not be mixed with the normal battery

capacity decrease over time. All charging batteries lose some of their capacity

when repeatedly charged/discharged. The actual decrease in capacity compared

to the number of charging cycles depends on the battery type. This information

is normally provided in the technical specification from battery manufacturer.

MI 3000 EasiPLUS Safety and operational considerations

11

2.5 Standards applied

The EasiPLUS instrument is manufactured and tested in accordance with the following

regulations:

Electromagnetic compatibility (EMC)

BS EN 61326 Electrical equipment for measurement, control and laboratory

use – EMC requirements

Class B (Hand-held equipment used in controlled EM

environments)

Safety (LVD)

BS EN 61010-1 Safety requirements for electrical equipment for measurement,

control and laboratory use – Part 1: General requirements

BS EN 61010-

031

Safety requirements for hand-held probe assemblies for electrical

measurement and test

BS 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

BS EN 61557 Electrical safety in low voltage distribution systems up to 1000

V

AC

and 1500 V

AC

– Equipment for testing, measuring or

monitoring of protective measures

Part 1 ......... General requirements

Part 2 ......... Insulation resistance

Part 3 ......... Loop resistance

Part 4 ......... Resistance of earth connection and equipotential

bonding

Part 6 ......... Residual current devices (RCDs) in TT and TN

systems

Part 7 ......... Phase sequence

Part 10........ Combined measuring equipment

DIN 5032 Photometry

Part 7 ......... Classification of illuminance meters and luminance

meters

Other reference standards for testing RCDs

BS EN 61008 Residual current operated circuit-breakers without integral

overcurrent protection for household and similar uses

BS EN 61009 Residual current operated circuit-breakers with integral

overcurrent protection for household and similar uses

EN 60364-4-41 Electrical installations of buildings

Part 4-41 .... Protection for safety – protection against electric

shock

BS 7671 IEE Wiring Regulations (17

th

edition)

Note about EN and IEC standards:

 Text of this manual contains references to European and British 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.

MI 3000 EasiPLUS Instrument description

12

3 Instrument description

3.1 Front panel

Figure 3.1: Front panel

Legend:

1........ON/OFF key, to switch the instrument on and off.

The instrument will automatically switch off 10 minutes after the last key press /

function switch rotation.

2........Function selector switch.

3 ....... CAL key, to compensate for the test lead resistance in low-value resistance

measurements.

4 ...... HELP key, to access help menus. ..

5........Jogger keypad with cursors for navigating screen menus and TEST keys for

starting tests.

The TEST key also acts as the PE touching electrode which detects potentially

dangerous voltages appearing on the PE conductor.

6…….BACKLIGHT and CONTRAST key. This is used to turn the backlight on and off

and for adjusting the level of the contrast.

The high level backlight is automatically shut off 20 seconds after the last key

press / function switch rotation in order to extend service life of the battery.

7........128  64 dots matrix display with backlight.

MI 3000 EasiPLUS Instrument description

13

Connector panel

1

3

2

> 550V

Figure 3.2: Connector panel

Legend:

1........Test connector.

Warning! Maximum allowed voltage between test terminals and ground is

600V! Maximal allowed voltage between test terminals is 550 V!

2........Power supply socket.

3........ Protection connector cover.

MI 3000 EasiPLUS Instrument description

14

3.2 Back panel

1

2

3

Figure 3.3: Back panel

Legend:

1........Battery/fuse compartment cover.

2........Information label.

3........Fixing screws for battery/fuse compartment cover.

5

6

4

1

2

3

F1

F3

F2

Fuse

SIZE AASIZE AA

SIZE AA

SIZE AASIZE AASIZE AA

S/N XXXXXXXX

Figure 3.4.: Battery and fuse compartment

MI 3000 EasiPLUS Instrument description

15

Legend:

1........Fuse F1.

2........Fuse F2.

3........Fuse F3.

4........Serial number label.

5........Battery cells (size AA).

6........Battery holder.

3.3 Bottom view

Continuity 7mA

R: 0.0 1999

Test current: max. 7mA

Open-circuit voltage: 5.4V 7.2V

 



DC

DC DC

Insulation resistance (EN 61557-2)

R: 0.000M 199.9M , U =100V , 250V

R: 0.000M 999M , U = 500V , 1kV

U: 0V 1200V,

Nominal voltages: 100V , 250V , 500V , 1kV

Measuring current: min. 1mA at R =U 1k /V

Short-circuit current: <3mA

 





NDCDC

DC DC DC DC

NN

DC

R: 0.00 1999

Test current: min. ±200mA

Open-circuit voltage: 5.4V 9.0V

Low



 



DC DC

Tripping time

non-delayed (time-delayed) RCDs

t : 0ms 300ms (500ms)

t : 0ms 150ms (200ms)

t : 0ms 40ms (150ms)

U : 0.00V 100.0V







C

Tripping current

I : 0.2 I 1.1 I

t : 0ms 300ms

U : 0.00V 100.0V

 



 



NN

C

Contact voltage

U : 0.00V 100.0V

R : 0.00 10.00k (R =U / I )

C

SSC N



 



Fault loop resistance (without tripping RCD)

R : 0.00 10k

U : 0.00V 100.0V, (U =R I )

S

CCS N

 

 



Line resistance

R : 0.00 1999

I : 0.06A 24.4kA

Nominal voltage: 100V 440V / 45Hz 65Hz

L-N(L)

PSC

AC AC

 





Fault loop resistance (EN 61557-3)

R : 0.00 1999

I : 0.06A 24.4kA

Nominal voltage: 100V 440V / 45Hz 65Hz

L-PE

PFC

AC AC

 





Voltage, frequency

U: 0V 440V

f: 45Hz 65Hz



Phase rotation (EN 61557-7)

Nominal voltage: 100V 440V / 45Hz 65Hz

Results: 1.2.3. or 2.1.3

AC AC



I : 10mA, 30mA, 100mA, 300mA, 500mA, 1A

Multiplier: / 1, 2, 5

Nominal voltage: 100V 264V / 45Hz 65Hz



N

2

AC AC



 

1

RCD (EN 61557-6)

Continuity (EN 61557-4)

3

1

2

Figure 3.5: Bottom view

Legend:

1........Information label.

2........Neck strap openings.

3........Handling side covers.

MI 3000 EasiPLUS Instrument description

3.4 Carrying the instrument

The neck strap supplied in standard set allows the instrument to be carried in a variety

of different ways.. The operator can choose the most appropriate method based on the

tasks they are performing. See the following examples:

The instrument can be

hung around operator's

neck allowing the

instrument to move

freely. This allows

equipment to be moved

quickly between test

locations.

The instrument can be used from inside the

soft carrying case – test cables can be

connected to the instrument through the front

flap of the carry case.

16

MI 3000 EasiPLUS Instrument operation

17

4 Instrument operation

4.1 Meaning of symbols and messages on the instrument display

The instrument display is divided into four sections:

1

2

3

4

Figure 4.1: Display outlook

Legend:

1........Function and parameter line.

In the top line of the display, the measuring function/sub-function and

parameters are displayed.

2........Result field.

In this field the main result and sub-results together with the

PASS/FAIL/ABORT status are displayed.

3........ Online voltage and output monitor.

4........Message field.

4.1.1 The online voltage and output terminal monitor

Online voltages are displayed together with test terminal

indication. All three test terminals are used for selected

measurement.

Online voltages are displayed together with test terminal

indication. L and N test terminals are used for selected

measurement.

Polarity of test voltage applied to the output terminals, L

and N.

Unknown supply system.

L – N polarity changed.

fr

Frequency out of range.

MI 3000 EasiPLUS Instrument operation

18

4.1.2 Message field – battery status

Battery power indication.

Low battery indication. Battery pack is too weak to

guarantee correct result. Replace the batteries.

Recharging is running (if power supply adapter is

connected).

4.1.3 Message field – measurement warnings/messages

Warning! High voltage is applied to the test terminals.

Warning! Phase voltage on the PE terminal! Stop all the

measurements immediately and eliminate the fault before

proceeding with any activity!

Measurement is running. Consider any displayed

warnings!

Measurement can be performed after pressing the TEST

key. Consider any displayed warning after starting the

measurement!

Measurement prohibited. Consider any displayed

warnings and check online voltage/terminal monitor!

Co

Test leads resistance in low-value resistance

measurement is compensated.

RCD tripped during the measurement. The trip limit may

be exceeded as a result of leakage current flowing to the

PE protective conductor or capacitive connection

between L and PE conductors.

RCD not tripped during the measurement.

Instrument overheated. Temperature of internal

components in the instrument reached top limit.

Measurement is prohibited until the temperature is lower

then that limit.

Battery capacity is too low to guarantee correct result.

Replace the batteries.

MI 3000 EasiPLUS Instrument operation

19

Fuse F1 (continuity circuit) blown or not inserted.

S SF F

Single fault condition in IT system.

4.1.4 Result field

Measurement passed.

Measurement failed.

Measurement is aborted. Check the conditions at the

input terminal.

4.1.5 Other messages

Hard Reset

Instrument settings and measurement parameters/limits

are set to initial (factory) values. For more information

refer to chapter 4.5.5. Recalling original settings.

CHECK SUM ERROR

Memory contents damaged. Contact your distributor or

manufacturer for further information.

4.1.6 Sound warnings

The shortest sound

Pressed key deactivated.

Sub-function is not available.

Short sound

Pressed key activated.

Measurement has been started after pressing the TEST

key. Consider any displayed warnings during

measurement.

Long sound

Measurement is prohibited. Consider any displayed

warnings and check online voltage/terminal monitor!

Periodic sound

Warning! Phase voltage on the PE terminal! Stop all the

measurements immediately and eliminate the fault before

proceeding with any activity!

MI 3000 EasiPLUS Instrument operation

20

4.1.7 Function and parameter line

1

2

3

Figure 4.2: Function selector switch and belonging parameter line

Legend:

1……Main function name.

2……Function or sub-function name.

3……Measuring parameters and limit values.

4.2 Selecting measurement function/ subfunction

The following measurements can be selected with the function selector switch:

 Voltage and frequency,

 Insulation resistance,

 Low-value resistance,

 RCD testing,

 Fault loop impedance,

 Line impedance,

 Phase sequence,

The function/sub-function name is highlighted on the display by default.

Sub-function can be selected by using  and  keys in function/parameter line.

4.3 Setting measurement parameters and limits

By using  and  keys select the parameter/limit value you want to edit. By using 

and  keys the selected parameter can be set.

Once the measurement parameters are set, the settings are retained until new changes

are made or the original settings are recalled.

4.4 Help menu

Help menus are available in all functions. The Help menu contains schematic diagrams

for illustrating how to properly connect the instrument to electric installation. After

selecting the measurement you want to perform, press the HELP key in order to view

the associated Help menu.

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METREL EasiPLUS MI 3000 User manual

METREL EasiPLUS MI 3000 User manual

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