Amprobe DMIII User manual

Copyright Amprobe 2005
DMIII MultiTest
User’s Manual

AMPROBE
DMIII MULTITEST
EN-1
INDEX
1. SAFETY PRECAUTIONS AND PROCEDURES .......................................................................................... 4
1.1. Forwards.................................................................................................................................................................. 4
1.2. Preliminary Instruction ............................................................................................................................................. 4
1.3. During Use............................................................................................................................................................... 5
1.4. After Use.................................................................................................................................................................. 5
2. GENERAL DESCRIPTION ........................................................................................................................... 6
2.1. Introduction .............................................................................................................................................................. 6
2.2. Functions ................................................................................................................................................................. 6
3. PREPARATION FOR USE ........................................................................................................................... 7
3.1. Initial Control............................................................................................................................................................ 7
3.2. Power Supply........................................................................................................................................................... 7
3.3. Calibration................................................................................................................................................................ 8
3.4. Storage .................................................................................................................................................................... 8
4. INSTRUMENT DESCRIPTION ..................................................................................................................... 9
4.1. Display Description ................................................................................................................................................ 10
4.2. Initial Screen .......................................................................................................................................................... 10
4.3. Backlight function................................................................................................................................................... 10
5. INITIAL SETTINGS......................................................................................................................................11
5.1. How To Adjust The Contrast.................................................................................................................................. 11
5.2. How To Set Date And Time ................................................................................................................................... 11
5.3. How To Set The Language.................................................................................................................................... 11
5.4. How To Adjust The Country................................................................................................................................... 11
5.5. RESET................................................................................................................................................................... 12
6. SAFETY TEST FUNCTIONS.......................................................................................................................13
6.1. LOW: Continuity Test with 200mA Test Current................................................................................................. 13
6.1.1. Calibrating the test leads ("CAL" Mode) ..........................................................................................................................14
6.1.2. Measurement Procedure .................................................................................................................................................16
6.1.3. Results of "AUTO" mode .................................................................................................................................................17
6.1.4. Results of "RT+" and "RT-" modes ..................................................................................................................................17
6.1.5. "AUTO", RT+", "RT-" faulty cases....................................................................................................................................19
6.2. INSULATION TEST: Insulation Resistance Measurement....................................................................................... 21
6.2.1. Measurement Procedure .................................................................................................................................................21
6.2.2. Results of "MAN" mode ...................................................................................................................................................23
6.2.3. Results of "TMR" mode....................................................................................................................................................24
6.2.4. "MAN" and "TIMER" mode faulty cases...........................................................................................................................25
6.3. : Phase Sequence Indicator............................................................................................................................. 26
6.3.1. Measurement procedure and results of " " mode.......................................................................................................26
6.3.2. Faulty Cases ............................................................................................................................................................28
6.4. GROUND TEST: Soil Resistance and Resistivity Measurements ......................................................................... 30
6.4.1. Measurement procedure and results of "2-W"and "3-W" mode.......................................................................................30
6.4.2. Measurement procedure and results of "" mode .........................................................................................................32
6.4.3. "2-W", "3-W" and "" faulty cases..................................................................................................................................34
7. POWER QUALITY.......................................................................................................................................36
7.1. Basic Setting: ANALYZER CONFIG ...................................................................................................................... 37
7.1.1. Type of electrical system under test ................................................................................................................................37
7.1.2. How to set the fundamental frequency ............................................................................................................................37
7.1.3. How to set the Clamp Type..............................................................................................................................................38
7.1.4. How to set the current range............................................................................................................................................38
7.1.5. How to set the value of the transformer voltage ratio (TV RATIO) ..................................................................................38
7.1.6. How to enable/disable the password ...............................................................................................................................38
7.2. Basic Setting: RECORDER CONFIG..................................................................................................................... 39
7.3. POWER QUALITY FUNCTIONS ........................................................................................................................... 46

AMPROBE
DMIII MULTITEST
EN-2
7.4. "VOLTAGE" function.............................................................................................................................................. 47
7.4.1. Symbols ...........................................................................................................................................................................47
7.4.2. "METER" mode................................................................................................................................................................48
7.4.3. "HARM" mode..................................................................................................................................................................49
7.4.4. "WAVE" mode..................................................................................................................................................................51
7.5. "CURRENT" function ............................................................................................................................................. 52
7.5.1. Symbols ...........................................................................................................................................................................52
7.5.2. “METER" mode................................................................................................................................................................53
7.5.3. “HARM" mode..................................................................................................................................................................54
7.5.4. "WAVE" mode..................................................................................................................................................................56
7.6. "POWER" function ................................................................................................................................................. 57
7.6.1. Symbols ...........................................................................................................................................................................57
7.6.2. "METER" mode................................................................................................................................................................58
7.6.3. "WAVE" mode..................................................................................................................................................................60
7.7."ENERGY" function................................................................................................................................................ 61
7.7.1. Symbols ...........................................................................................................................................................................61
7.7.2. "METER" mode................................................................................................................................................................62
8. MEASURING PROCEDURES.....................................................................................................................63
8.1. Using the instrument in a single-phase system...................................................................................................... 63
8.2. Using the Instrument in a three-phase 4-wire system............................................................................................ 64
8.3. Using the Instrument in a three-phase 3-wire system............................................................................................ 65
9. SAVING RESULTS......................................................................................................................................67
9.1. Saving Safety Test Results.................................................................................................................................... 67
9.2. Saving Displayed Values of POWER QUALITY Function...................................................................................... 67
10.RECORDINGS.............................................................................................................................................68
10.1.Start A Recording................................................................................................................................................... 68
10.2.During A Recording................................................................................................................................................ 70
10.2.1. MENU key........................................................................................................................................................................70
10.2.2. Rotary Switch during a recording.....................................................................................................................................71
10.3.Stopping a Recording / Energy Measurement ....................................................................................................... 71
11.INSTRUMENT'S MEMORY .........................................................................................................................72
11.1.SAFETY TEST MEMORY...................................................................................................................................... 72
11.2.ANALYZER MEMORY........................................................................................................................................... 73
12.CONNECTING THE INSTRUMENT TO A PC.............................................................................................74
13.MAINTENANCE...........................................................................................................................................75
13.1.General Instruction................................................................................................................................................. 75
13.2.Battery Replacement ............................................................................................................................................. 75
13.3.Instrument Cleaning............................................................................................................................................... 75
14.TECHNICAL SPECIFICATIONS .................................................................................................................76
14.1.Technical Features ................................................................................................................................................ 76
14.1.1. Safety Test functions .......................................................................................................................................................76
14.1.2. POWER QUALITY function .............................................................................................................................................77
14.2.Standards .............................................................................................................................................................. 78
14.2.1. General ............................................................................................................................................................................78
14.2.2. Safety Test.......................................................................................................................................................................78
14.2.3. POWER QUALITY...........................................................................................................................................................78
14.3.General Specifications........................................................................................................................................... 79
14.3.1. Mechanical Data ..............................................................................................................................................................79
14.3.2. Power supply ...................................................................................................................................................................79
14.3.3. Display .............................................................................................................................................................................79
14.3.4. Memory............................................................................................................................................................................79
14.4.ENVIRONMENT .................................................................................................................................................... 79
14.5.ACCESSORIES..................................................................................................................................................... 80
15.SERVICE .....................................................................................................................................................81
15.1.WARRANTY CONDITIONS................................................................................................................................... 81
15.2.SERVICE ............................................................................................................................................................... 81
16.PRACTICAL REPORTS FOR ELECTRICAL TESTS .................................................................................82

AMPROBE
DMIII MULTITEST
EN-3
16.1.Continuity Test On Protective Conductors............................................................................................................. 82
16.2.Check of the Circuit Separation ............................................................................................................................. 83
16.3.Measurement Of Floor Insulation Resistance In Medical Rooms Cei 64-4............................................................ 86
16.4.Ground Resistance Measurement ......................................................................................................................... 88
16.5.Ground Resistivity Measurement........................................................................................................................... 89
16.6.Voltage Anomalies (Voltage Sag and Surge)......................................................................................................... 91
16.7.Voltage and current Harmonics ............................................................................................................................. 91
16.7.1. Theory..............................................................................................................................................................................91
16.7.2. Limit values for harmonics ...............................................................................................................................................93
16.7.3. Presence of harmonics: causes.......................................................................................................................................93
16.7.4. Presence of harmonics: consequences ...........................................................................................................................94
16.8.Power and Power Factor definition........................................................................................................................ 94
16.8.1. Conventions on powers and power factors......................................................................................................................96
16.8.2. 3 Phase 3 Wire System ...................................................................................................................................................97
16.9.Measuring Method: outlines................................................................................................................................... 98
16.9.1. Integration periods ...........................................................................................................................................................98
16.9.2. Power factor calculations .................................................................................................................................................98
16.9.3. Voltage Anomalies and Periods Analysis comparison.....................................................................................................98
17.APPENDIX 1 –MESSAGES DISPLAYED ................................................................................................100
18.APPENDIX 2 –RECORDABLE PARAMETERS: SYMBOLS...................................................................101
Release EN 1.00 of the 31/06/2005

AMPROBE
DMIII MULTITEST
EN-4
1. SAFETY PRECAUTIONS AND PROCEDURES
1.1. FORWARDS
This instrument conforms to the safety standards EN61557 and EN 61010-1 relating to
electronic measuring instruments.
WARNING
For your own safety as well as that of the instrument you are recommended
to follow the procedures described in this instruction manual and carefully
read all the notes preceded by the symbol .
Strictly adhere to the following instructions before and during measurements:
Do not measure voltage or current in wet or dusty places;
Do not measure in presence of gas, explosive materials or combustibles;
Do not touch the circuit under test if no measurement is being taken;
Do not touch exposed metal parts, unused terminals, circuits and so on;
Do not effect any measurement in case of unusual conditions of the instrument such as
deformation, breakage, leakage of substances, absence of display reading etc;
Do not use the External power supply adapter (code DMT-EXTPS) if you notice
deformation, or breakage in the case, in the wire or in the plugs;
Pay careful attention when measuring voltages exceeding 25V in particular places
(building yards, swimming pools, etc.) and 50V in ordinary places because of the risk of
electric shock;
Use only cables and accessories approved by Amprobe;
The following symbols are used in this manual:
Caution: refer to the instructions in this manual; improper use may damage the
apparatus or its components.

AC Voltage or Current.
Unidirectional pulsating Voltage or Current.
Rotary switch of the instrument.
1.2. PRELIMINARY INSTRUCTION
This instrument has been designed for use in environments with a pollution level 2 and
up to (and no more than) 2000 meters altitude.
It can be used for Safety Test on Installation with Over voltage Category III 300V~
(phase to earth) and for voltage and current measurements on installations with over
voltage category III 600 V~ phase-to-phase / 300 V~ phase to earth or CATII 350 V
phase to earth.

AMPROBE
DMIII MULTITEST
EN-5
Please keep to the usual safety standards aimed at:
Protecting against dangerous currents;
Protecting the instrument against incorrect operations.
Only the accessories supplied with the instrument guarantee compliance with the
safety standards. Accordingly, they must be in good conditions and, if necessary, they
must be replaced with identical models.
Do not take measurements on circuits exceeding the specified current and voltage
limits.
Before connecting cables, alligator clips and clamps to the circuit under test, make sure
that the right function has been selected.
Do not take any measurements under environmental conditions beyond the limits
specified in paragraph 14.4.
Check that batteries are not weak and are installed correctly.
Before connecting test leads to the circuit under test, check that rotary switch position
is correct.
1.3. DURING USE
Please read the following recommendations carefully and instructions:
WARNING
Non-compliance with the Warnings and/or Instructions may damage the
apparatus and/or its components or injure the operator.
Before selecting any function disconnect the test leads from the circuit under test.
When the instrument is connected to the circuit under test do not touch any unused
terminal.
Avoid taking resistance measurements in the presence of external voltages; even
though the instrument is protected, a high voltage may cause malfunctions.
When measuring current, other currents located near the leads may affect the
measuring accuracy.
When measuring current, always position the wire in the middle of the jaws in order to
obtain the highest accuracy.
A measured value remains constant if the "HOLD" function is active. Should you notice
that the measured value remains unchanged, disable the “HOLD” function.
WARNING
The symbol " " shows the battery charge: When it is completely black the
batteries are full charged, while the " " symbol indicates weak batteries.
When the batteries are too low to execute a test, the instrument will show a
warning message.
In this case, interrupt testing and replace batteries, following the procedure
described in paragraph 13.2. The instrument is capable of keeping the data
stored even though batteries are not installed. The Instrument Date and
Time settings aren'tlost if you change the batteries within 24hours.
1.4. AFTER USE
After use, turn off the instrument by pressing & holding ON/OFF for a few seconds.
Remove batteries when the apparatus remains unused for long periods. Please follow
the storage instructions described at paragraph 14.4.

AMPROBE
DMIII MULTITEST
EN-6
2. GENERAL DESCRIPTION
2.1. INTRODUCTION
Dear Customer, we thank you for your patronage. The instrument you have just purchased
will grant you accurate and reliable measurements provided that it is used according to the
present manual’s instructions.
The instrument was designed to grant the user the utmost safety conditions thanks to a
new concept assuring double insulation and over voltage category III.
2.2. FUNCTIONS
The instrument is able to perform the following tests:
LOW: Continuity Test of Protection and Equalising conductors with a test
current higher than 200mA and open circuit voltage ranging from 4V to
24V.
INSULATION TEST: Measurement of insulation resistance with DC test voltage 50V, 100V,
250V, 500V or 1000V.
: Indication of phase rotation sequence
GROUND TEST Measurement of Ground Resistance and Resistivity using Earth rods.
POWER QUALITY: The Instrument allows the followingoperations:
Display in real time the electrical parameters of a single-phase
and three-phase systems and the harmonic analysis of voltage
and current.
Conduct a direct Energy measurement (without memorizing).
Memorize (by pressing the SAVE key) the sampled values of the
Parameters present at instrument input generating a "Smp" record
inside instrument memory. It will be possible to analyze the
memorized data ONLY by transferring it to a PC.
Record simultaneously (pressing the START key after a proper
set up): RMS values of voltages, currents, corresponding
harmonics, active, reactive and apparent powers, power factors
and cos, active, reactive and apparent energies, voltage
anomalies (voltage sag and surge) with 10ms resolution. It will be
possible to analyze the recorded data ONLY by transferring
them to a PC.
WARNING
Please note the difference between memorize and record. These terms
will be used repeatedly in this manual. Please focus on their definitions and
distinctions.

AMPROBE
DMIII MULTITEST
EN-7
3. PREPARATION FOR USE
3.1. INITIAL CONTROL
This instrument has been checked mechanically and electrically prior to shipment.
Care has been taken to ensure that the instrument reaches you under safe conditions.
You are recommended, however, to carry out a rapid check to detect any possible
damage, which might have been caused during transport. Should this be the case,
immediately contact Amprobe.
Also, check that the packaging contains all the parts listed under paragraph 14.5. In case
of discrepancies contact the dealer.
In case you have to send the instrument back please follow the instructions reported in
paragraph 15.
3.2. POWER SUPPLY
The instrument can be powered by:
6 batteries 1.5V AA series located in the compartment on the back of the instrument
(not included in the package). For battery life see paragraph 14.3.2.
An external power supply adapter (code DMT-EXTPS) to be used only for
POWER QUALITY functions. We recommend that you use only DMT-EXTPS
Amprobe Power Supply adapter.
For your own safety you’re not able to use the external power supply adapter during
Safety Test (LOW, INSULATION TEST, ,GROUND TEST rotary Switch positions).
If you press the START button the Instrument will show the message "REMOVE
POWER".
The symbol shows the battery charge: If it is completely "black" the batteries are
fully charged, while the symbol indicates weak batteries. When the batteries are too
low to execute the test the instrument will show a warning message. In this case interrupt
testing and replace the batteries following the procedure described in paragraph 13.2. The
instrument is capable of keeping the data stored even though batteries are not installed.
The Instrument Date and Time settings aren't lost if you change the batteries within
24hours.

AMPROBE
DMIII MULTITEST
EN-8
WARNING
For recordings (POWER QUALITY function) ALWAYS use the external
power supply adapter (code DMT-EXTPS) even the instrument allows the
operator to perform a recording using internal batteries. If during a recording
the external power supply adapter is de-energized, the instrument will
continue the recording using the internal battery power until the batteries
are exhausted (the data stored up to the point the instrument shuts down
won’t get lost). Because of this we recommend you ALWAYS insert a new
set of batteries before a long recording.
The instrument uses sophisticated algorithms to prolong the battery life. Specifically:
The instrument switches OFF the backlight Automatically after 5 seconds.
If the instrument is displaying in real time (and the external power supply adapter is not
connected), after about 5 minutes from the last key press or switch rotation the
instrument turns off automatically ("AUTOPOWER OFF" procedure).
If the instrument is recording or is measuring energy (and the external power supply is
not connected), after about 5 minutes from the last key press or switch rotation the
instrument starts a special procedure to save the batteries ("ECONOMY MODE"): the
instrument keeps recording but the display is turned off.
3.3. CALIBRATION
The instrument fulfils the technical specifications listed in this manual. The performance of
the specifications is guaranteed for one year.
3.4. STORAGE
In order to maintain the accuracy of the measurements, after a period of storage in
extreme environmental conditions, wait the necessary time for the apparatus to return to
normal operating conditions (see environmental specifications listed in paragraph 14.4).

AMPROBE
DMIII MULTITEST
EN-9
4. INSTRUMENT DESCRIPTION
SAVE
F1 F3 F4
F2
HOLD
ENTER
MENU ESC
START
STOP
1
2
3
LEGEND:
1. Display
2. Function Keys
3. Rotary switch
Front panel of the Instrument
Multifunction Keys.
ON/OFF and backlight key. Press it for few seconds to switch OFF the
instrument, press it briefly to activate the backlight function.
This key starts (and stops) the measurements.
This key saves the result displayed.
This key has 2 functions: it is the confirmation key inside the
configuration menu and it freezes the displayed results using the
POWER QUALITY function.
This key opens the General Configuration Menu.
This key cancels modification in the configuration menus or the selected
working modes.
F1
START
STOP
HOLD
ENTER
MENU
F2
F4
F3
ON/OFF
SAVE
ESC

AMPROBE
DMIII MULTITEST
EN-10
4.1. DISPLAY DESCRIPTION
The display is a graphic module with a resolution of 128 x 128 pixels
The first line of the display shows date and time. If not correct, you can set the exact ones
according to the procedure described at paragraph 5.2.
On the top right corner of the display you can always see the battery indicator and, if the
external power supply adapter (code DMT-EXTPS) is connected, the corresponding
symbol.
LOW05.06.01
27.09.00 17:35:12
----
R+ R-
--------
---mA ---mA
AUTO 0.11
SINGLE PHASE
VOLTAGE
V1 = 230.2 V
Vpk1 = 325.5 V
ThdV = 0.0 %
freq = 50.0 Hz
FUNC
CAL
HARM
WAVE
These symbols will be omitted in the following illustrations.
4.2. INITIAL SCREEN
When turning on the instrument by pressing ON/OFF, this screen will appear for a few
seconds:
DMIII
Multitest
AMPROBE
SN:00000000 V: X.XX
BAUD RATE 57600
Here you can see:
Serial number of the instrument (SN.:)
Firmware software release (V.X.XX:)
Transmission speed through serial RS232 (Baud Rate)
4.3. BACKLIGHT FUNCTION
When the instrument is turned on, pressing, briefly, the ON/OFF button, the backlight will
be enabled. The light will be automatically turned off after 5 seconds.
If the batteries are too low the instrument will automatically disable the backlight function.

AMPROBE
DMIII MULTITEST
EN-11
5. INITIAL SETTINGS
By pressing the MENU key the following screen will be displayed:
It’s not possible to enter the MENU during a recording or a Real Time Energy
measurement. Pressing this button during a recording will display the main recording
parameters (see paragraph 10.2).
5.1. HOW TO ADJUST THE CONTRAST
By pressing the multifunction keys F1 and F2, position the cursor on the CONTRAST item
and then press the ENTER key.
By pressing the multifunction keys F3 and F4, adjust the contrast (higher values
correspond to a higher contrast while lower values correspond to a lower contrast) and
press the ENTER key to SAVE the change or press ESC to quit the modification.
This setting will remain unchanged after turning off the instrument.
5.2. HOW TO SET DATE AND TIME
By pressing the multifunction keys F1 and F2, position the cursor on the DATE&TIME item
and then press the ENTER key.
The time is expressed as hh:mm (2 digit for hours, 2 digit for minutes) military time.
Press the ENTER key to SAVE the change or press ESC to quit the modification.
This setting will remain unchanged after turning off the instrument.
5.3. HOW TO SET THE LANGUAGE
By pressing the multifunction keys F1 and F2, position the cursor on the LANGUAGE (EN)
or LINGUA (IT) item and confirm it by pressing the ENTER key.
By pressing the multifunction keys F1 and F2, position the cursor on the desired language
and press the ENTER key to SAVE the change or press ESC to cancel the modification.
This setting will remain unchanged after turning off the instrument.
5.4. HOW TO ADJUST THE COUNTRY
By pressing the multifunction keys F1 and F2, position the cursor on the COUNTRY item
and confirm it by pressing the ENTER key. By pressing the multifunction keys F1 and F1,
select the Country among the following possibilities:
UE_m: European Countries: Distance setting in "meter" for Resistivity measurement
Date format DD/MM/YY
US_m: United States: Distance setting in "meter" for Resistivity measurement
Date format MM/DD/YY
US_ft: United States: Distance setting in "feet" for Resistivity measurement
Date format MM/DD/YY
Press the ENTER key to SAVE the change or press ESC to quit the modification.
This setting will remain unchanged after turning off the instrument.
MENU GENERAL
SAFETY TEST MEMORY
ANALYZER MEMORY
RESET
ANALYZER CONFIG
RECORDER CONFIG
CONTRAST
DATE&TIME
LANGUAGE
COUNTRY



AMPROBE
DMIII MULTITEST
EN-12
5.5. RESET
This option re-establishes the default settings of the instrument.
ANALYZER CONFIG:
Type of electrical equipment: Three Phase 4 wires
Frequency: not modified
Clamp full scale: not modified
Clamp type: not modified
Transforming ratio of voltmetric transformers: 1
Password: disabled
RECORDER CONFIG:
Start: manual (the recording is started
at 00 sec mark on clock after pressing
START/STOP)
Stop: manual
Integration period: 15min
Recording of harmonics: ON
Recording of voltage anomalies (sags and surges): ON
Voltage reference for detection of sags and surges: 110V
Upper limit for detection of sags and surges: 6%
Lower limit for detection of sags and surges: 10%
Selected voltages: V1, V2, V3
Selected voltage harmonics: THD, 01, 03, 05, 07
Selected currents: I1, I2, I3, IN
Selected current harmonics: THD, 01, 03, 05, 07
CO-GENERATION: OFF
Selected powers, Pf and cos: Pt, P1, P2, P3
Qti, Q1i, Q2i, Q3i
Qtc, Q1c, Q2c, Q3c
St, S1, S2, S3
Pft, Pf1, Pf2, Pf3
dpft, dpf1, dpf2, dpf3
Energies: Eat, Ea1, Ea2, Ea3
Erit, Eri1, Eri2, Eri3
Erct, Erc1, Erc2, Erc3
Est, Es1, Es2, Es3
The RESET command will not erase the instrument’s memory.

AMPROBE
DMIII MULTITEST
EN-13
6. SAFETY TEST FUNCTIONS
6.1. LOW: CONTINUITY TEST WITH 200mA TEST CURRENT
The measurement is taken according to EN 61557-2 and VDE 0413 part 4.
WARNING
Before carrying out the continuity test be sure that there is no voltage at the ends
of the conductor under test.
Turn the rotary knob to the LOWposition.
This key allows the operator to select one of the following measuring modes:
AUTO mode (the instrument carries out two measurements with reversed
polarity and displays their average value). This mode is recommended
for the continuity test.
RT+ mode (measurement with positive polarity and the ability to set the
duration time of the test). In this case the operator can set a measuring
time long enough to permit them to move the protective conductors while
the instrument is carrying out the test so as to detect any bad
connections.
RT- mode (measurement with negative polarity and the ability to set the
duration time of the test). In this case the operator can set a measuring
time long enough to permit him to move the protective conductors while
the instrument is carrying out the test so as to detect any bad connection.
This key permits the operator to perform a calibration (compensation for the
resistance of the cables used for the measurement).
N.B. If the resistance is lower than 5(including the resistance of the calibration) the
continuity test is executed by the instrument with a test current higher than 200mA.
If the resistance is higher than 5the continuity test is executed by the instrument
with a current lower than 200mA.
We recommend that you check the calibration of the test leads before executing a
measurement according to next paragraph.

AMPROBE
DMIII MULTITEST
EN-14
6.1.1. Calibrating the test leads ("CAL" Mode)
1. Connect the black and yellow test leads to T1 and T4 input terminals
respectively.
T1 T2 T3 T4
I1 I2 I3
(V1) (V2) (V3)
(COM)
Connection of instrument terminals during calibration procedure.
2. If the test leads supplied with the instrument are not long enough for the
measurement you can extend the black cable.
3. Short-circuit the measuring cable ends making sure that the conductive parts of the
alligator clipsmake good contact with each other (see previous picture).
4. Press the F2 key. The instrument performs the calibration.
WARNING
Never disconnect the test leads when the message "MEASURING" is
displayed.
LOW05.06.01
A numerical value
----
R+ R-
--------
---mA ---mA
AUTO 0.11
in this field means
that the instrument
has been
calibrated; this
value remains on
the display for
any further
measurement
even though the
unit is switched off
and on again.
FUNC
CAL
5. At the end of the test the result is stored and used as OFFSET (that is to say
that it is subtracted from any continuity test carried out) for all the
subsequent measurements.
Note: The instrument performs the calibration only if the resistance of the test leads is
lower than 5.

AMPROBE
DMIII MULTITEST
EN-15
TEST LEADS Before each measurement always assure that the
calibration is for the cables in use. During a
continuity test, if the resistance value free of
calibration (that is the resistance value less the
calibration offset value) is negative, the symbol
is displayed. Probably the calibration resistance
value stored in the instrument memory is not for
the cables in use, therefore a new calibration must
be performed.
6.1.1.1. Procedure to reset test leads calibration parameters

To cancel calibration
parameters it is
necessary to perform a
calibration procedure
with a resistance of
test leads higher than
5(for example with
open test leads). When
a cancellation is effected
the screen to the right
is displayed temporarily.
LOW05.06.01
Message >99.9:
means that the
instrument detected a
resistance higher
than 5therefore it
will proceed with
Reset procedure.
>99.9
R+ R-
--------
---mA ---mA
AUTO 0.11
FUNC
CAL

AMPROBE
DMIII MULTITEST
EN-16
6.1.2. Measurement Procedure
1. Select the desired mode using the F1 key.
2. Connect the black and yellow test leads to T1 and T4 input terminals
respectively
T1 T2 T3 T4
I1 I2 I3
(V1) (V2) (V3)
(COM)
Connection of the test leads during LOWtest.
3. If the cables supplied with the instrument are not long enough for the measurement
you can extend the blackcable.
4. Short-circuit the test leads making sure that the conductive parts of the alligator clips
make a good contact to each other. Press the START key. If the display doesn't
show 0.00repeat the test leads calibration (see paragraph 6.1.1).
5. Connect the instrument terminals to the ends of the conductor under test (see
previous picture).
6. If the mode "RT+" or "RT-" was selected use the F3, F4 keys to set the
duration of the test.
7. Press the START key. The instrument will execute the measurement. In RT+/RT-
(Timermode) you can press START key again if you want to stop the test before the
duration set is expired.
ATTENTION
Never disconnect the test leads when the message "Measuring" is
displayed.
START
STOP

AMPROBE
DMIII MULTITEST
EN-17
6.1.3. Results of "AUTO" mode

At the end of the test, if
the average resistance
value Ravg is lower
than 5the instrument
emits a double sound
signal indicating the
positive outcome of
the test and displays a
screen similar to the
screen to the right.
LOW05.06.01
Average resistance value
(Ravg)
1.05
R+ R-
1.071.03
219mA 219mA
AUTO 0.11
Resistance values and
corresponding test currents
obtained after exchanging
the polarities of test leads
FUNC
CAL
The displayed result can be stored by pressing the SAVE key twice (refer to
paragraph 9.1).
6.1.4. Results of "RT+" and "RT-" modes

If a resistance value
RT+ or RT- lower than
5is detected, the
instrument emits a
double sound signal
indicating the positive
outcome of the test
displays a screen similar
to the screen to the
right.
LOW05.06.01
Max Resistance value of
R+ or R-.
1.07
219mA
RT+ 0.11TIME: 10s
Test current
Duration of the Test
FUNC
CAL


Note: We recommend the use of alligator clips and to assure the alligator clips make good
contact with the conductor under test. Indeed, in this test the instrument gives as a
final result the maximum measured value of R+ or R- and using test leads instead of
alligator clips could give you faulty results due to faulty contact between the test leads
and conductor under test
The displayed result can be stored by pressing the SAVE key twice (refer to
paragraph 9.1).

AMPROBE
DMIII MULTITEST
EN-18