VOLTCRAFT R-200 User manual

VOLTCRAFT
®
°
Milliohmmeter R-200
BEDIENUNGSANLEITUNG Seite 4 - 23
R-200 Milliohm Meter
OPERATING INSTRUCTIONS Page 24 - 43
Milliohmmètre R-200
NOTICE D’EMPLOI Page 44 - 63
Milliohmmeter R-200
GEBRUIKSAANWIJZING Pagina 64 - 83
Best.-Nr. / Item-No. /
N° de commande / Bestnr.:
10 13 93
Version 02/09

VOLTCRAFT IM INTERNET http://www.voltcraft.de
Impressum
Diese Bedienungsanleitung ist eine Publikation von Voltcraft®, Lindenweg 15, D-92242 Hirschau, Tel.-Nr. 0180/586 582 7
(www.voltcraft.de).
Alle Rechte einschließlich Übersetzung vorbehalten. Reproduktionen jeder Art, z.B. Fotokopie, Mikroverfilmung, oder die Erfassung in
elektronischen Datenverarbeitungsanlagen, bedürfen der schriftlichen Genehmigung des Herausgebers. Nachdruck, auch auszugswei-
se, verboten.
Diese Bedienungsanleitung entspricht dem technischen Stand bei Drucklegung. Änderung in Technik und Ausstattung vorbehalten.
© Copyright 2009 by Voltcraft®
Impressum /legal notice in our operating instructions
These operating instructions are a publication by Voltcraft®, Lindenweg 15, D-92242 Hirschau/Germany, Phone [phone]
(www.voltcraft.de).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data
processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in technology and equipment reserved.
© Copyright 2009 by Voltcraft®
Informations /légales dans nos modes d'emploi
Ce mode d'emploi est une publication de la société Voltcraft®, Lindenweg 15, D-92242 Hirschau/Allemagne, Tél. [phone]
(www.voltcraft.de).
Tous droits réservés, y compris de traduction. Toute reproduction, quelle qu'elle soit (p. ex. photocopie, microfilm, saisie dans des
installations de traitement de données) nécessite une autorisation écrite de l'éditeur. Il est interdit de le réimprimer, même par extraits.
Ce mode d'emploi correspond au niveau technique du moment de la mise sous presse. Sous réserve de modifications techniques et de
l'équipement.
© Copyright 2009 by Voltcraft®
Colofon in onze gebruiksaanwijzingen
Deze gebruiksaanwijzing is een publicatie van de firma Voltcraft®, Lindenweg 15, D-92242 Hirschau/Duitsland, Tel. [phone]
(www.voltcraft.de).
Alle rechten, vertaling inbegrepen, voorbehouden. Reproducties van welke aard dan ook, bijvoorbeeld fotokopie, microverfilming of de
registratie in elektronische gegevensverwerkingsapparatuur, vereisen de schriftelijke toestemming van de uitgever. Nadruk, ook van
uittreksels, verboden.
Deze gebruiksaanwijzing voldoet aan de technische stand bij het in druk bezorgen. Wijziging van techniek en uitrusting voorbehouden.
© Copyright 2009 by Voltcraft®01_0209_01/HK

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

2
Diese Bedienungsanleitung gehört zu diesem Produkt. Sie enthält wichtige Hinweise zur
Inbetriebnahme und Handhabung. Achten Sie hierauf, auch wenn Sie dieses Produkt an
Dritte weitergeben.
Heben Sie deshalb diese Bedienungsanleitung zum Nachlesen auf!
Eine Auflistung der Inhalte finden Sie in dem Inhaltsverzeichnis mitAngabe der entsprechenden
Seitenzahlen auf Seite 4.
These operating instructions belong with this product. They contain important informati-
on for putting it into service and operating it. This should be noted also when this pro-
duct is passed on to a third party.
Therefore look after these operating instructions for future reference!
A list of contents with the corresponding page numbers can be found in the index on page 24.
Ce mode d'emploi appartient à ce produit. Il contient des recommandations en ce qui
concerne sa mise en service et sa manutention. Veuillez en tenir compte et ceci égale-
ment lorsque vous remettez le produit à des tiers.
Conservez ce mode d'emploi afin de pouvoir vous documenter en temps utile.!
Vous trouverez le récapitulatif des indications du contenu à la table des matières avec mention
de la page correspondante à la page 44.
Deze gebruiksaanwijzing hoort bij dit product. Er staan belangrijke aanwijzingen in
betreffende de ingebruikname en gebruik, ook als u dit product doorgeeft aan derden.
Bewaar deze handleiding zorgvuldig, zodat u deze later nog eens kunt nalezen!
U vindt een opsomming van de inhoud in de inhoudsopgave met aanduiding van de pagina 64.

3

24
 Introduction
Dear Customer,
Thank you for making the excellent decision to purchase this Voltcraft® product.
You have acquired a quality product from a brand family which has distinguished itself in the fields of
measuring, charging and network technology thanks to its particular expertise and its permanent inno-
vation.
With Voltcraft®, you will be able to cope even with difficult tasks as either an ambitious hobbyist or as a
professional user. Voltcraft® offers you reliable technology and extremely good value for money.
Therefore, we are absolutely sure: Your starting to use Voltcraft will also be the beginning of a long, suc-
cessful relationship.
We hope you will enjoy using your new Voltcraft® product!
Table of Contents
Introduction ............................................................................................................................................24
Delivery Contents ..................................................................................................................................25
Intended Use ..........................................................................................................................................25
Controls ..................................................................................................................................................26
Safety Instructions ..................................................................................................................................27
Product Description ................................................................................................................................29
Display Information and Symbols ..........................................................................................................30
Measuring Mode ....................................................................................................................................31
a) Switching on the Measuring Instrument....................................................................................31
b) Measuring Voltage “V” ..............................................................................................................31
c) Measuring Current “µA/mA” .................................................................................................... 32
d) Measuring Capacity “CAP” ......................................................................................................33
e) Continuity Check ......................................................................................................................34
f) Diode Test ................................................................................................................................34
g) Measuring Resistance “Ω”........................................................................................................35
HOLD Function ..............................................................................................................................36
REL Function ..................................................................................................................................37
MAX/MIN Function ..........................................................................................................................37
Auto Power OFF Function ..............................................................................................................37
Switching on Display Illumination ....................................................................................................38
Cleaning and Maintenance ....................................................................................................................38
Inserting and Changing the Batteries ..............................................................................................38
Changing the Fuse ..........................................................................................................................39
Disposal..................................................................................................................................................40
Troubleshooting ......................................................................................................................................41
Technical Data ........................................................................................................................................41

25
Delivery Content
Multimeter
2 safety measuring leads (red and black)
2 Kelvin measuring leads (red and black)
6 mignon batteries
Plastic case
Operating instructions
Intended Use
- Measuring and displaying electric parameters in the range of excess voltage category CAT III (up to
max. 600V against earth potential, pursuant to EN 61010-1) and all lower categories.
- Measurement of direct and alternating voltages up to a maximum of 600V DC/AC rms (effective)
- Measurement of direct and alternating current between 0 µA and 400 mA
- Measurement of resistances to 40 MΩusing 2-lead measurement procedure
- Measurement of resistances from 0.1 m Ωto 40 Ω using 4-lead measurement procedure (with
Kelvin measuring leads)
- Acoustic continuity check (< 35 ohms) and diode test.
- Capacity measurement up to 40 mF
The measurement functions are selected using the dial switch. Automatic measurement range selection
is active in all measurement ranges (apart from 4-lead low Ohm measurement and continuity test).
The two current measuring ranges are secured against overload with a ceramic high-performance fuse.
The voltage in the measuring circuit may not exceed 600 V.
The measuring instrument must not be operated when it is open, i.e. with an open battery compartment
or when the battery compartment cover is missing. Measurements must not be carried out under
unfavourable ambient conditions.
Adverse ambient conditions include:
- Dust or combustible gases, vapours or solvents,
- Electrical storms or stormy conditions resulting in strong electrostatic fields, etc.
For safety reasons, when measuring only use measuring cables or accessories which are adjusted to
the specifications of the multimeter.
Any use other than that described above will damage the product and may involve other risks, such as
short-circuit, fire, electric shock. Do not change or modify any part of the product.
Read the operating instructions carefully and retain them for later reference.
The safety instructions must be observed!

26
Controls
(see fold-out page)
1 LCD display
2 MAX/MIN button for max/min value display
3 HOLD button to “freeze” the displayed values
4 MODE/REL button to switch to double-allocated measuring functions (AC/DC, continuity test and
diode test) and relative measurement in low Ohm range
5 Dial switch
6 Light button to switch the display illumination on
7 Attachment fitting (for holding strap etc.)
8 Foldable mounting brackets
9 Battery compartment
10 Red measuring socket “E1” for all 2-lead measuring functions (V, Ohm, CAP and mA; positive
potential)
11 Black measuring socket “E2” for all 2-lead measuring functions (COM; earth reference, negative
potential)
12 Black Kelvin measuring socket “P1” for all 4-lead low Ohm measuring functions (negative potential)
13 Red Kelvin measuring socket “P2” for all 4-lead low Ohm measuring functions (positive potential)

27
Safety Instructions

Please read all of the operating instructions before using the product for the first
time; they contain important information about the correct operation.
The warranty/guarantee is rendered void in cases of damage resulting from failure to
comply with these operating instructions! We do not accept any liability for conse-
quential damages!
Nor do we assume liability for damage to property or personal injury caused by
improper use or the failure to observe the safety instructions! In such cases the war-
ranty/guarantee is voided.
This device left the factory in perfect condition in terms of safety engineering. To maintain this condition
and ensure safe operation, you, as the user, must comply with the safety instructions and warnings con-
tained in these instructions.
The following symbols must be observed:

An exclamation mark in a triangle shows important information in this user’s manual that
has to be observed.
Ꮨ
The lightning symbol in a triangle warns against an electric shock or the impairment of the
electrical safety of the appliance.
☞The “hand” symbol indicates special information and advice on operation of the device.
This product has been CE-tested and meets the necessary European guidelines.
Class 2 insulation (double or reinforced insulation)
CAT II Overvoltage category II for measurements on electric and electronic devices which are
supplied voltage to via a mains plug. This category also covers all smaller categories (e.g.
CAT I for measuring signal and control voltages).
CAT III Overvoltage category III for measuring in building installation (e.g. outlets or sub-distribu-
tion). This category also covers all smaller categories (e.g. CAT II for measuring electronic
devices).
Earth potential
For safety and licensing reasons (CE), unauthorised conversion and/or modification of the device is not
permitted.

28
Consult an expert when in doubt about the operation, the safety or the connection of the device.
Measuring instruments and accessories are not toys and have no place in the hands of children!
On industrial sites the accident prevention regulations of the association of the industrial workers’ soci-
ety for electrical equipment and utilities must be followed.
In schools, training centres, computer and self-help workshops, handling of measuring instruments must
be supervised by trained personnel in a responsible manner.
Before measuring voltages, always make sure that the measuring instrument is not set to a measuring
range for electrical currents.
The voltage between the “E1/E2” connection points and earth must never exceed 600 V DC/AC in CAT
III. The voltage between the “P1/P2” connection points and earth must never exceed 30 V DC/AC.
The test probes have to be removed from the measured object every time the measuring range is
changed.
Take particular care when dealing with voltages exceeding 25 V AC or 35 V DC! Even at these voltages
it is possible to receive a fatal electric shock if you touch electrical conductors.
Prior to each measurement, check your instrument, including its measuring leads, for any damage. Nev-
er carry out measurements when the protective insulation is damaged (ripped, torn off etc.).
In order to avoid an electric shock, ensure that you do not touch the connections to be measured, even
indirectly, during measurements. During measuring, do not grip beyond the grip range markings (which
you can feel) present on the test probes.
Do not use the multimeter just before, during or just after an electrical storm (electrical shock / high-ener-
gy overloads!). Please make sure that your hands, your shoes, your clothing, the floor, switches and
switching components are dry.
Avoid operation near strong magnetic or electromagnetic fields, transmitter aerials or HF generators.
These could lead to an incorrect measurement being carried out.
If you have reason to believe that the device can no longer be operated safely, disconnect it immediate-
ly and make sure it is not unintentionally operated. It can be assumed that safe operation is no longer
possible if:
- the device shows visible damage
- the device no longer functions
- the device was stored under unfavourable conditions for a long period of time or
- following considerable stress during transportation.
Do not switch the measuring instrument on immediately after it has been taken from a cold to a warm
environment. The condensation generated could cause serious damage to the device. Allow the device
to reach room temperature before switching it on.
Do not leave packaging material unattended. It can be dangerous to children who play with it.
When measuring only use measuring cables or accessories which are adjusted to the specifications of
the multimeter.
You should also heed the safety instructions in each chapter of these instructions.

29
Product Description
The multimeter (referred to as DMM in the following) indicates measured values along with units and
symbols on the digital display. The measuring value display of the DMM comprises 4000 counts (count =
smallest display value). A bargraph shows rapid changes in values.
If the DMM is not operated for approx. 30 minutes, it automatically switches off. This saves battery pow-
er and extends the period of operation.
The meter can be used for do-it-yourself or for professional applications.
For better readability, the DMM can also be optimally mounted with the clip on the rear.
Dial switch (5)
The individual measuring functions are selected via a dial
switch. The automatic range selection “Autorange” is active in
the standard functions, voltage, resistance (2-lead measure-
ment), capacity and current. The appropriate range of measure-
ment is set for each application individually.
Some measurement functions are double assigned. With the
“MODE” (4) button you switch functions within these measuring
functions (e.g. switching resistance measuring - diode test and
continuity test or AC/DC switching in the voltage range). Each
press switches the function.
If the meter switch is set to “OFF”, the meter is switched off. Always turn the device off when it is not in
use.

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Display Information and Symbols
This is a summary of all possible symbols and information on the DMM
AUTO Automatic range setting is active
MANU Symbol for manual range setting
HOLD Data-Hold function is active
OL Overload = the measuring range was exceeded
OFF Off The DMM is switched off
Symbol for battery change required
Symbol for the diode test
Symbol for the acoustic continuity tester
Symbol for display illumination
Direct/alternating current (AC/DC)?
DC Direct current for voltage and current
AC Alternating current for voltage and current
mV Millivolt (exp.–3)
V Volt (unit of electric potential difference or voltage)
A Ampere (unit of electric current)
mA Milliampere (exp.–3)
ΩOhm (unit of electric resistance)
kΩKiloohm (exp.3)
MΩMegaohm (exp.6)
nF Nanofarad (unit of electric capacity, exp.-9)
µF Microfarad (exp.-6)
mF Millifarad (exp.-3)
MAX Display of maximum value
MIN Display of minimum value

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Measuring Mode

Do not exceed the maximum permitted input values. Do not touch circuits or parts of
circuits if there could be voltages higher than 25 V ACrms or 35 V DC present within
them! Risk of fatal injury!
Before measuring, check the connected measuring leads for damage such as, for
example, cuts, cracks or squeezing. Defective measuring cables must no longer be
used. Risk of fatal injury!
During measuring, do not grip beyond the grip range markings (which you can feel)
present on the test probes.
ᏘMeasuring is only possible with the housing and battery compartment closed.
You may only connect the measuring leads that are required for measuring operation
to the measuring device. Remove all measuring leads not required from the device
for safety reasons.
☞If “OL” (overload) appears on the display, you have exceeded the measuring range.
a) Switching on the meter
The meter can be turned on using the dial switch (5). Turn the dial switch to the corresponding mea-
surement function. To switch off turn the dial switch to “OFF”. Always turn the device off when it is not in
use (“OFF”).

Prior to working with the meter, you have to insert the enclosed batteries. Insertion
and changing of batteries is described in the “Cleaning and Maintenance” chapter.
b) Measuring Voltage “V”
Proceed as follows to measure DC voltages “V/DC”:
- Turn the DMM on and select measuring range “V”.
- Plug the red single measuring lead into the V measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket
“E1” (13).
- Now connect the two measuring probes to the object to be measured
(battery, switch etc.). The red measuring tip indicates the positive pole,
the black measuring tip the negative pole.
- The polarity of the respective measured value is indicated on the dis-
play together with the current measured value.
☞If a minus “-” appears in front of the voltage value when mea-
suring DC, the measured voltage is negative (or the measur-
ing tips have been mixed up).
- After measuring, remove the measuring leads from the measuring object and turn the DMM off.

32
Proceed as follows to measure AC voltages “V/AC”:
- Turn the DMM on and select measuring range “V”.
- Press “MODE” (4) to switch to the AC measuring range. “AC” appears in the display.
- Plug the red single measuring lead into the V measuring socket “E2” (10) and the black measuring
lead into the COM measuring socket “E1” (13).
- Now connect the two measuring probes to the object to be measured (generator, switch etc.).
- The measuring value is indicated on the display
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
c) Measuring Current “µA/mA”

The voltage in the measuring circuit may not exceed 600 V.
Never measure currents above 400 mA in the µA/mA range, as this will cause the
fuse to trip.
Before beginning to measure, ending measurements and changing the measure-
ment range, always shut off the circuit.
Always start current measurements at the highest measurement range (mA) and switch
down to lower ranges if necessary. All current measuring ranges are secured with fuses
and thus protected against overload.
Proceed as follows to measure DC current (A/DC):
- Turn the DMM on and select measuring range “µA” or “mA”. For currents
>4 mA select the range “mA”, for currents <4 mA choose “µA”.
- Plug the red single measuring lead into the mA measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket “E1”
(13).
- Now connect the two test probes in series with the object to be measured
(battery, circuit etc.); the display indicates the polarity together with the
measured value.
☞If a minus “-” appears in front of the measured value when mea-
suring DC, the measured voltage is negative (or the measuring
leads have been mixed up).
- After measuring, remove the measuring leads from the measuring object
and turn the DMM off.

33
Proceed as follows to measure AC currents (A/AC):
- Turn the DMM on and select measuring range “µA” or “mA”. For currents >4 mA select the range
“mA”, for currents <4 mA choose “µA”.
- Press “MODE” (4) to switch to the AC measuring range. “AC” appears in the display.
- Plug the red single measuring lead into the mA measuring socket “E2” (10) and the black measuring
lead into the COM measuring socket “E1” (13).
- Connect the two measuring probes in series with the object to be measured. The measured value will
be displayed.
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
d) Measuring Capacity “CAP”

Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
With electrolyte capacitors, ensure that you observe the polarity.
- Turn the DMM on and select measuring range “CAP”.
- Plug the red single measuring lead into the mA measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket “E1”
(13).
- The display shows the unit “nF”.
☞Due to the sensitive measuring input, the display may show a
value even with “open” measuring leads. This does not affect
the accuracy of measurement.
- Connect the two test probes (red = positive pole/black = negative pole)
with the object to be measured (capacitor). After a short while the display
shows the capacity. Wait until the displayed value has stabilised. With
capacities of >40 µF, this may take a few seconds.
- If “OL” (overload) appears on the display, you have exceeded the mea-
suring range.
- After measuring, remove the measuring leads from the measuring object and turn the DMM off.

34
e) Continuity Check

Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
- Turn the DMM on and select measuring range
- Press “MODE” (4) to switch measurement functions. The symbol for con-
tinuity check now appears in the display. Pressing this button again takes
you to the next measuring function.
- Plug the red single measuring lead into the Ω-measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket “E1”
(13).
- A continuity value of less than 35 Ohm is identified as continuity; in this
case a beep sounds.
- If “OL” (overload) appears on the display, you have exceeded the mea-
suring range or the measuring circuit has been broken. Perform a
counter-pole measurement to check.
- After measuring, remove the measuring leads from the measured object
and turn the DMM off.
f) Diode Test

Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
- Turn the DMM on and select measuring range
- Press “MODE” (4) twice to switch measurement functions. The diode
symbol appears in the display. Pressing this button again takes you to the
first measuring function etc.
- Plug the red single measuring lead into the Ω-measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket “E1”
(13).
- Check the measuring leads for continuity by connecting both measuring
probes with one another. The value must be approximately 0 V.
- Now connect the two measuring probes with the object to be measured
(diode).
- The display shows the continuity voltage “UF” in volt (V). If “OL” appears,
the diode is measured in reverse direction (UR) or the diode is faulty
(interruption). Perform a counter-pole measurement to check.
- After measuring, remove the measuring leads from the measured object
and turn the DMM off.
☞Silicon diodes exhibit a continuity voltage (UF) of approx.
0.4 – 0.9 V.

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g) Resistance measurement “ΩΩ”

Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
The Milliohm meter allows you to measure resistances in normal measurement ranges from 0.1 Ωto 40
MΩusing the 2-lead measurement procedure and also allows the precise measurement of low Ohm
resistances from 0.1 mΩto 40 Ωusing the 4-lead measurement procedure.
The 2-lead measurement includes the resistance of the measuring leads in the total
measurement. The measurement lead resistance is approx. 0.5 Ω. This low value can
be disregarded in a measurement range up to 40 MΩ. The switching diagram is illus-
trated on the right:
Both resistances “R E1” and “R E2” indicate the measurement leads. “R” indicates the
measured object. All three resistances contribute to the measured value.
The 4-lead measurement connects a current and voltage measurement circuit.
According to Ohm’s law, all currents in a series circuit are equal. The current mea-
surement in the measurement circuit is independent of the measurement location.
The voltage measurement is carried out at high Ohms so that the measurement circuit
is not loaded and the measured values are not falsified. The additional voltage mea-
surement then allows the resistance to be measured without loss through cables (for-
mula: R = U/I). The switching diagram is illustrated on the right:
The two measurement methods are explained in the following.
Proceed as follows to measure the resistance using the 2-lead procedure:
- Turn the DMM on and select measuring range “Ω”.
- Plug the red single measuring lead into the Ω-measuring socket “E2”
(10) and the black measuring lead into the COM measuring socket “E1”
(13).
- Check the measuring leads for continuity by connecting both measuring
probes with one another. The resistance value must be approximately 0 -
0.5 Ohm (inherent resistance of the measuring leads).
- Connect the measuring probes to the object to be measured. As long as
the object to be measured is not high-Ohm or interrupted, the measured
value will be indicated on the display. Wait until the displayed value has
stabilised. With resistances >1 MΩthis may take a few seconds.
- If “OL” (overload) appears on the display, you have exceeded the mea-
suring range or the measuring circuit has been broken.
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
☞If you carry out a resistance measurement, make sure that the measuring points which you
contact with the measuring probes are free from dirt, oil, soldering paint or similar. An incor-
rect measurement may result under such circumstances.

36
Proceed as follows to measure the resistance using the 4-lead procedure:
- Turn the DMM on and select measuring range “400 mΩ, 4Ωor 40Ω”
depending on the measurement you are going to make.
- Plug the red double-measuring lead (Kelvin measuring lead) into the Ω
measuring socket “E2” (10) and the second plug lead into the measuring
socket “P2” (11).
- Plug the black double-measuring lead (Kelvin measuring lead) into the
COM measuring socket “E1” (13) and the second plug into the measuring
socket “P1” (12).
- Check the measuring leads for continuity by connecting both measuring
probes with one another. This should produce a display value of 0 (+/-
0,1). The unit changes depending on the measurement range.
- Connect the measuring probes to the object to be measured. As long as
the object to be measured is not high-Ohm or interrupted, the measured
value will be indicated on the display. Wait until the displayed value has
stabilised.
- If “OL” (overload) appears on the display, you have exceeded the mea-
suring range or the measuring circuit has been broken.
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
☞If you carry out a resistance measurement, make sure that the measuring points which you
contact with the measuring probes are free from dirt, oil, soldering paint or similar. An incor-
rect measurement may result under such circumstances.
If no stable measurement values are shown or if the continuity check (0-display) fails, check
the inbuilt fuse “F2”. Fuse replacement is described in the “Cleaning and Maintenance”
chapter.
HOLD Function
The HOLD function freezes the currently indicated measured value to allow you to read it or to take the
record without rushing.

If you test live wires make sure that this function is deactivated before the measure-
ment starts. Otherwise, the measurement will be incorrect!
To switch on the Hold function, press the “HOLD” button (3); an acoustic signal confirms this command
and “HOLD” appears on the display.
In order to switch off the HOLD function, press the “HOLD” button again or simply change the measure-
ment function.

37
REL Function

The REL function is only active in the 4-lead resistance measurement ranges
(400 mΩΩ, 4ΩΩor 40ΩΩ).
The REL function allows a fast relative measurement, e.g. to display component tolerances. The refer-
ence component is measured and saved in the internal memory and then automatically deducted from
subsequent measurements. This allows the easy display of the deviation from the reference compo-
nent.
- Attach the object to be measured as per “Resistance measurement with 4-lead measurement proce-
dure” to the Kelvin measuring leads. Select the fitting measurement range and wait until the dis-
played value has stabilised.
- Press the “REL” button (4) in operating mode. “REL” appears in the display and the display is reset to
zero. The reference value is saved.
- Continue to carry out the difference measurement on the other measurement objects.
- Pressing the “REL” button again allows the control display of the saved value. The display will flash
“REL”. Pressing this button again switches back to the REL measurement mode.
- To exit the function, hold down the “REL” button for approx. 1s until “REL” disappears and the meter
beeps.
☞If the measurement range is changed or the measurement function is altered the REL
memory is deleted.
MAX/MIN Function
This function shows the minimum and maximum measured values in the display. The automatic range
selection (display shows “MANU”) is deactivated.
- Press the “MAX/MIN” button (2) in operating mode. “MAX” appears in the display and the highest val-
ue is displayed.
- Press the “MAX/MIN” button again to switch to “MIN”. The lowest value is shown
- Pressing the “MAX/MIN” button again cause the display to flash “MAX MIN” and the current mea-
sured value is displayed. The MIN/MAX memory continues to operate in the background.
- Every time you press the button you switch the display.
- To exit the function, hold down the “MAX/MIN” button for approx. 1s until “MAX”, “MIN” or “MAX MIN”
disappears and the meter beeps.
Auto Power OFF Function
The DMM turns off automatically after 30 minutes if no button or switch is operated. This function pro-
tects the battery, saves battery power and extends the service life.
To reactivate the DMM after automatic shutdown, use the dial switch or press any function button (apart
from the light button (6)).

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Switching on Display Illumination
The display can be illuminated in operating mode when the light conditions are bad. Press the light but-
ton (6) to switch on the illumination. The lighting stays on for approx. 5s and then switches off automati-
cally in order to protect the batteries.
Cleaning and Maintenance
General Information
To ensure the accuracy of the meter over an extended period of time, it should be calibrated once a year.
Apart from occasional cleaning and fuse replacements, the meter requires no servicing.
Information on changing the battery and fuse is provided below.

Regularly check the technical safety of the instrument and measuring leads, e.g.
check for damage to the housing or squashing etc.
Cleaning
Always observe the following safety instructions before cleaning the device:

Live components may be exposed if covers are opened or parts are removed (unless
this can be done without tools).
The connected leads must be disconnected from the measuring device and all mea-
suring objects prior to cleaning or repairing the device. Switch the DMM off.
Do not use cleaning agents which contain carbon, petrol, alcohol or similar substances for cleaning pur-
poses. These could corrode the surface of the measuring instrument. The vapours are also detrimental
to health and are explosive. Sharp-edged tools such as screwdrivers or metal brushes should not be
used for cleaning purposes.
When cleaning the device or the display and the measuring leads, use a clean, lint-free, antistatic, slight-
ly damp cloth. Allow the product to dry completely before you use it again to conduct measurements.
Inserting and Changing the Batteries
Operation of the meter requires six mignon batteries (AA). You need to insert new, charged batteries pri-
or to initial operation or when the battery change symbol appears on the display.

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Proceed as follows to insert or change the batteries:
- Disconnect all measuring leads from the meter and switch
it off.
- Fold out the mounting bracket (8) and unscrew the four
screws securing the battery compartment (9).
- Remove the cover of the battery compartment from the
meter. The batteries can be accessed now.
- Replace all the batteries with new ones of the same type.
- Close and secure the battery compartment in reverse order.
- The meter is ready for use once again.

Never operate the meter when it is open.
!RISK OF FATAL INJURY!
Do not leave flat batteries in the device. Even batteries protected against leaking can
corrode and thus release chemicals which may be detrimental to your health or
destroy the device.
Do not leave batteries lying around carelessly. They could be swallowed by children
or pets. If swallowed, consult a doctor immediately.
If the device is not used for longer periods of time, remove the batteries in order to
prevent leaking.
Leaking or damaged batteries may cause alkali burns if they come into contact with
the skin. It is therefore advisable to use suitable protective gloves.
Make sure that the batteries are not short-circuited. Do not throw batteries into
the fire.
Always replace all batteries at once. The use of new and discharged or old batteries
together affects the battery life. Always use batteries of the same type and from the
same manufacturer in a set of batteries. The batteries can be damaged by equalizing
currents and may leak.
Batteries must not be recharged or dismantled. There is danger of explosion.
☞You can order suitable alkaline batteries stating the following order no.:
Item no. 65 25 09 (please order six).
Only use alkaline batteries, as they are powerful and have a long service life.
Replacing the Fuse
The current measuring ranges “µA/mA” and the 4 leads resistance measurement ranges (connections
“P1/P2”) are secured with high performance fuses. If measuring in this range is no longer possible, you
have to change the fuse.