ILLKO MDtest User manual

USER’S
MANUAL
MDtest
(100-140 V)

MDtest (100-140 V) - User’s Manual Contents
Contents
1 Introduction 5
1.1 Safety ................................... 5
1.2 PerformanceMDtest ........................... 6
1.3 Appliedstandards............................. 6
1.4 Termsanddefinitions........................... 7
2 Description of the instrument 8
2.1 Generaldescription............................ 8
2.2 Terminals ................................. 9
2.3 Keyboard ................................. 11
2.4 Additionalfunctions ........................... 11
2.5 Display of information . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6 GraphicOLEDdisplay.......................... 12
2.7 Selection of the items in Menu or List . . . . . . . . . . . . . . . . . . 12
2.8 Users interface symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9 Abbreviations............................... 14
2.10Includedintheset ............................ 15
2.11Optionalaccessories............................ 15
3 Putting into operation 16
3.1 Connecting to mains outlet . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Self-test .................................. 17
3.3 Helpscreens................................ 17
4 Measurements 18
4.1 Selection of the function . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Measurement mode control . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 Measurement mode . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 HOLDfunction.......................... 19
4.2.3 Measurement of apparent power consumption . . . . . . . . . 19
4.3 Earthbond-Rpe............................. 20
4.3.1 Test lead resistance compensation . . . . . . . . . . . . . . . . 21
4.3.2 Protective earth resistance . . . . . . . . . . . . . . . . . . . . 21
4.4 Insulation resistance - Riso . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5 Enclosure leakage current according to EN 62353 . . . . . . . . . . . 25
4.5.1 Alternative method - IaltEq . . . . . . . . . . . . . . . . . . . 25
4.5.2 PE current during operation - IdirEq . . . . . . . . . . . . . . 26
4.5.3 Differential leakage current - IdifEq . . . . . . . . . . . . . . . 28
4.6 Leakage current from the Application parts according to EN 62353 . 30
4.6.1 Alternative method - IaltPat . . . . . . . . . . . . . . . . . . . 30
4.6.2 Direct method - IdirPat . . . . . . . . . . . . . . . . . . . . . 31
4.6.3 Direct method, DUT with an internal electrical power source
-IdirPatB............................. 33
4.7 Leakage currents according to IEC EN 60601-1 . . . . . . . . . . . . 34
4.7.1 Earth leakage current - I60601Earth . . . . . . . . . . . . . . 35
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MDtest (100-140 V) - User’s Manual Contents
4.7.2 Enclosure (chassis) leakage current - I60601Touch . . . . . . . 36
4.7.3 Lead to ground (application part) leakage current - I60601Pat 37
4.7.4 Lead isolation – Mains on Applied Parts leakage current -
I60601MAP ............................ 38
4.8 Other leakage currents . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.8.1 Alternative method - IaltEq . . . . . . . . . . . . . . . . . . . 39
4.8.2 PE current during operation – IdirEq / differential leakage
current-IdifEq.......................... 39
4.8.3 Enclosure leakage current - IdirTouch / IdifTouch . . . . . . . 41
4.9 Apparent power, mains voltage and current consumption - Power . . 43
4.9.1 Power, mains voltage and current consumption in test socket . 43
4.9.2 Measuring of power and current consumption by means of
currentclamp........................... 44
5 Database operations 45
5.1 Storing measurement data . . . . . . . . . . . . . . . . . . . . . . . . 45
5.2 The structure of the data memory . . . . . . . . . . . . . . . . . . . . 45
5.3 Enteringcharacters............................ 46
5.4 Identification number of device under test (ID) . . . . . . . . . . . . . 46
5.5 Working with test results . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.5.1 Viewing a list of tested DUTs . . . . . . . . . . . . . . . . . . 47
5.5.2 Searching for stored DUTs . . . . . . . . . . . . . . . . . . . . 48
5.5.3 Creating a new DUT file . . . . . . . . . . . . . . . . . . . . . 48
5.5.4 Deleting a DUT from the main memory . . . . . . . . . . . . 48
5.5.5 Modification of the ID number . . . . . . . . . . . . . . . . . . 49
5.5.6 Viewing measured values and evaluation . . . . . . . . . . . . 49
5.5.7 Modification of measured values and evaluation . . . . . . . . 50
5.6 Testsequences............................... 50
5.6.1 Description of the test sequence . . . . . . . . . . . . . . . . . 50
5.6.2 Creating a test sequence . . . . . . . . . . . . . . . . . . . . . 50
5.6.3 Assigning a test sequence to appliance . . . . . . . . . . . . . 51
5.6.4 Using the test sequence . . . . . . . . . . . . . . . . . . . . . . 51
6 Instrument main menu 52
6.1 Mainmenustructure........................... 52
6.2 Menu-DUTproperties.......................... 52
6.2.1 Menu - Measured values . . . . . . . . . . . . . . . . . . . . . 52
6.2.2 Menu - Visual inspection result . . . . . . . . . . . . . . . . . 52
6.2.3 Menu - Functional test result . . . . . . . . . . . . . . . . . . 52
6.2.4 Menu - Measurement result . . . . . . . . . . . . . . . . . . . 53
6.3 Menu - Test sequences . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.4 Menu-Emptyfile............................. 53
6.5 Menu-Setup ............................... 53
6.5.1 Menu - System info . . . . . . . . . . . . . . . . . . . . . . . . 53
6.5.2 Menu - Measure DC values . . . . . . . . . . . . . . . . . . . . 53
6.5.3 Menu-Self-test.......................... 54
6.5.4 Menu - Date of next calibration . . . . . . . . . . . . . . . . . 54
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MDtest (100-140 V) - User’s Manual Contents
6.5.5 Menu - Erase database . . . . . . . . . . . . . . . . . . . . . . 54
6.5.6 Menu - Measurement locking . . . . . . . . . . . . . . . . . . . 54
6.5.7 Menu - Save last method . . . . . . . . . . . . . . . . . . . . . 55
6.5.8 Menu - Date and Time . . . . . . . . . . . . . . . . . . . . . . 55
6.5.9 Menu-Keysbeep......................... 55
6.5.10 Menu-Volume .......................... 55
6.5.11 Menu-Language......................... 55
6.5.12 Menu - Nominal voltage . . . . . . . . . . . . . . . . . . . . . 55
7 Additional informations 56
7.1 Communication – data transfer . . . . . . . . . . . . . . . . . . . . . 56
7.2 Messages on the display . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.2.1 Warningmessages......................... 56
7.2.2 Operational information . . . . . . . . . . . . . . . . . . . . . 62
7.2.3 Setting information . . . . . . . . . . . . . . . . . . . . . . . . 64
7.2.4 Database information . . . . . . . . . . . . . . . . . . . . . . . 65
7.3 Reset of the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . 65
7.4 Utilization of other external adapters . . . . . . . . . . . . . . . . . . 66
7.4.1 Adapter for testing extension power supply cords (P 8030) . . 66
7.4.2 Three-phase adapter (P 8015-8018) . . . . . . . . . . . . . . . 66
7.5 Maintenance................................ 66
7.6 Recurrent tests and testing after repair . . . . . . . . . . . . . . . . . 67
7.7 Calibration and service . . . . . . . . . . . . . . . . . . . . . . . . . . 68
7.8 Ecology .................................. 68
8 Technical specification 69
8.1 Generaldata ............................... 69
8.2 Functions ................................. 69
8.2.1 Earthbond ............................ 69
8.2.2 Insulation resistance . . . . . . . . . . . . . . . . . . . . . . . 70
8.2.3 Alternative leakage current . . . . . . . . . . . . . . . . . . . . 70
8.2.4 Direct leakage current (TRMS AC+DC value) . . . . . . . . . 71
8.2.5 Direct leakage current (DC component) . . . . . . . . . . . . . 71
8.2.6 Differential leakage current . . . . . . . . . . . . . . . . . . . . 71
8.2.7 Leakage current by means of three-phase adapter . . . . . . . 72
8.2.8 Apparentpower.......................... 72
8.2.9 Mains voltage UL-N ........................ 72
8.2.10 Current consumption . . . . . . . . . . . . . . . . . . . . . . . 72
8.2.11 Current consumption by means of current clamp . . . . . . . . 72
8.2.12 Apparent power by means of current clamp . . . . . . . . . . 72
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MDtest (100-140 V) - User’s Manual 1 Introduction
1 Introduction
1.1 Safety
WARNING
Read this User’s Manual carefully and completely and follow
all instructions contained therein. If not, the use of the in-
strument may be dangerous for the operator, devices under
test or for the instrument!
If there is reason to believe that safe operation has become impossible,
put the instrument out of operation and secure it against any unin-
tended operation. Safe operation must be presumed to be no longer
possible, if:
•The instrument does not operate properly any longer.
•The instrument, cables, connectors, plugs or accessories exhibits
visible damages.
•The instrument was stored in unfavourable conditions for a long
period.
•The instrument was exposed to extraordinary stress caused by
transport.
WARNING
•Make sure that the instrument, measuring cables and all other
accessories are in flawless condition, e.g. no damaged insulation,
no broken cables or plugs etc.
•Make sure that the AC outlet is easily accessible. If some trou-
ble or malfunction occurs, immediately disconnect the MDtest
adaptor from the outlet.
•If the equipment is used in a manner not specified by the manu-
facturer, the device’s protection may be compromised.
•The instrument may only be powered from a 100÷140 V / 50 or
60 Hz grounded mains outlet, which is protected with a fuse or
circuit breaker with a maximum rating of 16 A.
•Voltage 127 V / 50/60 Hz will be used in this manual hereinafter.
•In order to check the proper PE connection to a mains outlet,
MDtest generates a continuous current of ca. 1.5 mA / 50 or
60 Hz to the PE conductor. This test current can activate the
insulation monitoring device in IT systems.
•Only a trained, skilled person, who is familiar with hazardous
voltage operations, can handle the MDtest. Unexpected haz-
ardous voltages can occur on devices under test (dangerously
charged capacitors, etc.).
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MDtest (100-140 V) - User’s Manual 1 Introduction
WARNING
•It is necessary to respect all safety regulations applicable to the
particular measurement.
•Test Socket 1of the MDtest must not be used for continuously
powering the appliance. It is intended for test purposes only;
max. test duration is 25 min @ ≤12 A and 60 s @ 12÷16 A.
•The functional test may only be performed after the DUT has
successfully passed the safety test.
•Dangerous voltage or mains voltage may be present on Test
Socket 1during some tests.
•Devices under test which are connected to Test Socket 1of the
MDtest can be powered by mains voltage during some tests. The
appliance can thus be activated.
•The PE terminal is connected to the PE terminal of Test Socket
1. When using the MDtest, do not connect any voltage to the
terminal PE. If connected, there is a danger of electric shock or
damage to the MDtest.
•Use only standard or optional accessories supplied with the
MDtest by your distributor.
The figures in this manual are only illustrative and may vary slightly
from the actual state or the version on your instrument.
1.2 Performance MDtest
The MDtest is a professional, compact, portable analyzer, designed to verify the
electrical safety of medical devices. The MDtest has an extraordinary wide scope
of use thanks to a lot of optional accessories, which enable testing practically any
portable or hard-wired, one-phase or three-phase medical device.
1.3 Applied standards
•EMC ..............................................EN 55011:2009+A1:2010
EN 61326-1:2013
EN 61000-4-2:2009
EN 61000-4-3:2006+A1:2007+A2:2010
EN 61000-4-4:2004+A1:2010
EN 61000-4-5:2006
EN 61000-4-6:2009
EN 61000-4-11:2004
•LVD ........................................................EN 61010:2010
EN 61010-2-030:2010
EN 61557-16:2014
EN 62353:2014
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MDtest (100-140 V) - User’s Manual 1 Introduction
The MDtest is designed to perform electrical safety testing based on:
•IEC 62353:2014
•IEC 60601-1 (only some tests)
1.4 Terms and definitions
Accessible conductive part
The part of the ME equipment (other than the applied part), which is accessible to
the patient, to the operator in contact with the patient or can come in contact with
the patient.
Applied part
The part of the ME equipment that (in normal use) necessarily comes into physical
contact with the patient for ME equipment or an ME system to perform its function.
Mains part
The part of electrical equipment forming a circuit that is intended to be connected
to the supply mains.
Another terms and definitions – see IEC 62353:2014
ID number (ID)
Unique ID number for the DUT.
Hazardous voltage.
Warning concerning a point of danger! Read User’s Manual and
observe all precautions!
Hint, notice.
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2 Description of the instrument
2.1 General description
The MDtest instrument is designed to verify the safety of electrical appliances and
medical devices in general. All AC measurements are measured by the method
TRMS (true rms), and for some measurements the DC component value can be
displayed. Measured circuits meet the requirements of EN 60601 and EN 62353
(requirements for measuring circuits), including the required input characteristics.
The MDtest performs the following tests:
•Earth bond test >1 A AC
•Insulation resistance test 250 V DC
•Alternative (substitute) equipment and applied part leakage current
•Direct equipment and applied part leakage current
•Differential leakage current
•Ground (Earth) leakage current
•Chassis (Enclosure) leakage current
•Lead to Ground (Patient) leakage current
•Lead isolation (Mains on applied parts leakage current)
•PE current during operation and differential leakage current
•Apparent power, mains voltage and current consumption
With additional equipment can be measured:
•measurement of PE current during operation and differential leakage current
of three-phase portable appliance by means of optional adapters
•measurement of apparent power and current consumption by means of current
clamp
The MDtest has furthermore additional features, which improve the safety of both
the operator and the DUT. These include:
•check for dangerous contact voltage on the PE of power outlet (before the
start of the measurement)
•check if the PE of the power outlet is grounded (before the start of the mea-
surement)
•automatic check for leakage current amplitude of the device under test
•check of the appliance’s current with automatic switch off the Test Socket 1:
0÷12 A . . . . . . . . . . . . . . . . . . . . max. 25 min
12 ÷16 A . . . . . . . . . . . . . . . . . . . max. 60 sec
•manual self-test
•nominal voltage 127 V or 120 V can be selected
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
Features and highlights:
•test results can be saved under an ID number which is unequivocally assigned
to the respective DUT (barcode, RFID chip)
•the test structures created at the PC software can be loaded into the MDtest
•measurement data saved to the test instrument can be imported to PC software
via the USB port and reports can be generated
•user-defined test sequences created at the PC software
•user-defined report templates created at the PC software
2.2 Terminals
1. Test Socket for connection of tested appliance’s power supply cord
2. PE – terminal for connecting the exposed conductive part of the tested appli-
ance (the terminal is connected to the PE terminal of Test Socket 1)
3. ITOUCH 2kΩ– touch leakage current test terminal
4. RISO /IALT – insulation resistance / alternative leakage current test terminal
5. PAT – terminal for connecting the patient parts of tested appliance
6. RPE – earth bond test terminal
7. PEMAINS – terminal connected with PE of mains
8. USB - socket type A for connection USB 2.0 Full Speed HID (Human Interface
Device), e.g. barcode scanner
9. USB – socket type B, PC connection
10. EXT input - current clamp / three-phase adapter / other adapters connector
11. Power supply cord
WARNING
•Do not connect any external voltage to any terminal or connector.
The only exception is the power supply cord 11 which is intended
for powering the MDtest from the 127 V / 50 or 60 Hz mains
outlet.
•Max. load on Test Socket 1is 16 A (limited in time).
•Use original accessories only.
•Do not connect any external voltage between RPE terminal and
the PE in Test Socket 1or PE terminal.
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
Figure 1: Front panel and rear panel
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2.3 Keyboard
12. [1 IALT]– Alternative leakage current of the device
13. [2 IALT]– Alternative leakage current of the patient parts
14. [3 RPE]– Earth bond test
15. [4 IDIR]– Direction leakage current of the accessible part
16. [5 IDIR]– Direction leakage current of the patient part
17. [6 RISO]– Insulation resistance, test voltage 250 V DC
18. [7 IDIF]– Differential leakage current of the accessible part
19. [8 IDIR Battery]– Leakage current of the patient part, battery powered device
20. [9 Power] – Apparent power consumption, current, mains voltage
21. [* UTIL] – Leakage current according to EN 60601-1:
- Leakage current of instrument part
- Touch leakage current of instrument part
- Leakage current of the patient part
- Leakage current of the patient part using the MAP method
(mains on applied parts)
22. [TEST] – Starts measurement
2.4 Additional functions
23. [0 HELP] – display the circuit diagram for selected measurement
24. [# ARET] – lock the TEST key
25. [N]– scroll up
26. [H]– scroll down, hold displayed data
27. [save] – save measured values
28. [menu] – main menu
29. [ent] – ENTER, find DUT according to ID, other functions depending on
context
30. [esc] – ESCAPE, other functions depending on context
31. Context menu buttons - actual function is displayed above the button
2.5 Display of information
32. Graphic OLED display
33. LED indicator for measuring status
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2.6 Graphic OLED display
a) Measured function
b) Real time clock / Measuring is in progress
c) Selected method and ID of DUT
d) Measured value
e) Actual function of context button (31)
f) Warning, notice, additional information
Figure 2: Graphic OLED display
2.7 Selection of the items in Menu or List
The item is selected using buttons:
[N]and [H]
Faster scroll in the lists:
[Page-] and [Page+]
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2.8 Users interface symbols
ARET lock the TEST key
AUT.ARET automatic lock the TEST key
HOLD displayed value is held
L-N xL-N reversal in Test Socket 1
CP ⇒PAT plug the test lead into the PAT terminal
CP ⇒2kΩplug the test lead into the ITOUCH 2kΩterminal
x PATIENT unplug / do not plug patient parts
SEQ test sequence is active
CAL test lead resistance compensation is finished
CAL the value of compensation is higher than measured value
ESC press button [esc]
TEST press button [TEST]
the selection is active, self-test passed
the selection is not active, self-test failed
measuring is in progress
warning – Test Socket 1energizing
plug external accessories
inner temperature is increasing when measuring PE resistance
notice - DUT must be isolated from ground
test voltage 250 V DC
menu Properties of DUT
menu Test sequences
menu Empty file of DUT
menu Setup
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2.9 Abbreviations
Lphase conductor
Nneutral conductor
PE protect earth conductor
ALT alternative (substitute) method
DIF differential method
DIR direct method
60601Earth protect conductor current – direct method (EN 60601-1)
60601Touch touch current – direct method (EN 60601-1)
60601Pat patient leakage current – direct method (EN 60601-1)
60601MAP patient leakage current Mains on applied part – direct method
(EN 60601-1)
Eq equipment
RL-N reversal
Ext external
Touch touch
Pat patient
Bbattery
Mmains part
CP conductive part
AP applied part
MD measuring device
FE functional earth
Mains mains voltage supply
DUT device under test
DUT PE device under test protective earth
Open PE open protective earth
Open N open neutral
socket connection: Test Socket 1
RPE connection: terminal RPE (Note: also applies to the other
terminals)
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MDtest (100-140 V) - User’s Manual 2 Description of the instrument
2.10 Included in the set
The set includes all accessories necessary for testing 127 V / 50 or 60 Hz appliances
equipped with a movable power supply cord.
The set includes:
•The measuring instrument MDtest
•P 2011 - Test lead, black, 2 m
•P 3011 - Test tip black
•USB cable A-B
•CD (User’s Manual + SW for PC)
•User’s Manual
•Calibration certificate
•Warranty card
2.11 Optional accessories
Carrying bag:
•P 6140 - Bag for instrument and some accessories
Measuring cables and adapters:
•P 2012 - Test lead, blue, 2 m
•P 2021 - Extension lead, black, 5 m
•P 2030 - Test lead - connects up to 10 patient parts to MDtest
•P 3012 - Test tip, blue
•P 4011 - Crocodile clip, black
•P 4012 - Crocodile clip, blue
•P 8030 - Adapter for testing extension power supply cords
Special accessories:
•P 8010 - Current clamp transformer
•P 8015 - Three-phase adapter, 16 A socket, 5 contacts
•P 8016 - Three-phase adapter, 16 A socket, 4 contacts
•P 8017 - Three-phase adapter, 32 A socket, 5 contacts
•P 8018 - Three-phase adapter, 32 A socket, 4 contacts
•P 9022 - Barcode scanner (CCD) USB 2.0 Full Speed
•P 9060 - Self-adhesive barcode labels
•P 9080 - Stick-on label with appliance next test term marking
•P 9092 - Barcode and label printer Brother PT-E300VP
•P 9100 - Label tape TZ-241 for printer Brother PT-E300VP, white, 18 mm
width, 8 m length
•P 9101 - Label tape TZ-231 for printer Brother PT-E300VP, white, 12 mm
width, 8 m length
•P 9102 - Label tape TZ-221 for printer Brother PT-E300VP, white, 9 mm
width, 8 m length
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MDtest (100-140 V) - User’s Manual 3 Putting into operation
3 Putting into operation
3.1 Connecting to mains outlet
If the mains outlet, mains cable, instrument’s case or acces-
sories are damaged, do not connect the MDtest to the mains
outlet!
If Idir and Idif is being measured, use the grounded mains
outlet only to supply the instrument!
Make sure the correct nominal voltage (120 V or 127 V) is
selected (see chapter 6.5.12)
The MDtest can only be powered from 100÷140 V / 50 or 60 Hz, which is protected
with a fuse or circuit breaker with a maximum rating of 16 A. The instrument is
automatically switched on after plugging into the mains outlet. Disconnect any
DUT while connecting/disconnecting the MDtest to/from the mains outlet!
The MDtest automatically tests the protective PE (ground) pin of the
mains outlet. If the PE connection is inadequate, then the message
(PE error) is displayed.
In order to check the proper PE connection to a mains outlet, the
MDtest generates a continuous current of ca. 1.5 mA / 50 or 60 Hz to
the PE conductor. This test current can activate the insulation moni-
toring device in IT systems.
If the MDtest is connected to an IT earthing system, it is possible to
measure – e.g. Rpe, Riso, Ialt and IdirPatB.
If dangerous contact voltage arises on the PE, then the (PE error)
indicator lights up when the operator presses the key [TEST]. If op-
erator presses the [TEST] key after this, the measurement will not
start.
WARNING
If the test result for the ground pin of the mains outlet is
unsatisfactory (in TT or TN systems), the outlet must be
repaired before you plug in the MDtest to the outlet again!
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MDtest (100-140 V) - User’s Manual 3 Putting into operation
3.2 Self-test
It can sometimes be difficult to identify if the measuring instrument does not work
properly, especially when measuring current leakage. The MDtest therefore has
built in the possibility to promptly test the basic functionality. The functionality of
the following functions can be tested:
•Insulation resistance
•Measurement of alternative (substitute) leakage current
•Measurement of PE current during operation
•Measurement of differential leakage current
WARNING
•Disconnect DUT before the MDtest self-test!
•This test does not substitute for calibration!
•The MDtest has to be connected to TT or TN mains.
The test result is displayed on the display using the symbols pass / fail. Test
proceeds as follows:
•Disconnect the DUT.
•Press the [menu] key and release it.
•Use the [H]key to select (Setup), press the [ent] key for confirmation.
•Use the [H]key to select (Self-test), press the [ent] key for confirmation.
•Press the [TEST] button. The test will then start; after it is finished, the
results are displayed: (self-test passed) or (self-test failed).
•The correct values are:
–RisoM-PE: 1.000 ±0.050 MΩ
–IaltEq: 0.100 ±0.010 mA
–IdirEq: 0.100 ±0.010 mA
–IdifEq: 0.100 ±0.010 mA
Contact service if the test results differ from the ones described above.
3.3 Help screens
The help screens are available in all functions. The Help screens contain schematic
diagrams for illustrating how to properly connect the instrument for electric instal-
lation, applied standards and the number of a picture according to the standard.
After selecting the measurement you want to perform, press the [0 HELP] (once
or repetitively) key in order to see the associated Help screens.
Press the [0 HELP] or [esc] to leave the Help.
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MDtest (100-140 V) - User’s Manual 4 Measurements
4 Measurements
4.1 Selection of the function
The measured function can be selected automatically in sequence mode (see chap-
ter 5.6) or manually (see Figure 3).
Figure 3: Keyboard
4.2 Measurement mode control
The beginning, process and ending of measurements are controlled by the [TEST]
key. If the [esc] key was pressed during the measurement, then it will be cancelled
(the measured value is not saved).
4.2.1 Measurement mode
The measurement can start in four different measurement modes:
•One measuring cycle – after the [TEST] key is pressed and released, one
measuring cycle starts and is completed after a few seconds. The result of the
measurement is displayed.
•Continuous measurement – press the [TEST] key; measurement is in progress
and current measured values are displayed until the [TEST] key is released.
The result of the measurement is displayed.
•Locking the measurement - press the [# ARET] key and then press the
[TEST] key. Then release both keys. The measurement is in progress and the
current measured values are displayed until the [TEST] key is again pressed
and released. Reverse steps are possible too: press the [TEST] key and then
press the the [# ARET] key.
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MDtest (100-140 V) - User’s Manual 4 Measurements
•Automatically locking the measurement – this function can be set in the menu
Setup. Measuring is similar to Locking the measurements but the [# ARET]
key is not used.
Measuring in process is indicated by the symbol .
4.2.2 HOLD function
When measurement is in progress, the current measured values are displayed. By
pressing and releasing the [H] key the last measured value is displayed even if the
measurement has either ended or is in progress. This measured value is stored in
temporary memory.
The HOLD function is indicated when the symbol HOLD on indicator changes to
unremitting light. The HOLD function can be cancelled (when measurement is still
in progress) by pressing and releasing the [H] key.
4.2.3 Measurement of apparent power consumption
During some measurements, the apparent consumption is displayed in the upper
display.
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MDtest (100-140 V) - User’s Manual 4 Measurements
4.3 Earth bond - Rpe
Figure 4: Rpe measurement
WARNING
•Do not connect any external voltage between the RPE terminal
and the PE in Test Socket 1or PE terminal.
•If you are going to test equipment which can be charged to volt-
age >25 V (e.g. filter capacitors), discharge it before the test!
If external voltage is present on the device under test, the message
(Interference voltage at the input) is displayed. This status is a
dangerous fault condition; disconnect the DUT from the MDtest im-
mediately to avoid damage!
Resistance measurement is also possible if the MDtest is connected to
the IT mains.
We recommend performing the measurements for a max. of 30 secs.
because of power dissipation inside the instrument (only for value
<10.00 Ω). If the temperature inside exceeds the allowed limit, the
symbol is displayed and the acoustic signal sounds.
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