Burster Resistomat 2323 User manual

Portable Milli-Ohmmeter
WESiSTOMAP
Type 2323 (D07)
O 2002 burster Manufacturer:
präzisionsmeßtechnikgmbh
& CO kg bursterpräzisionsmeßiechnikgmbh & co kg
All rights reserved Taistraße 1 - 5 PO Box 1432
76593 Gernsbach 76587 Gernsbach
Note:
The informationcontained in Ihefollowing issubject to change without prior notice. No part of this
docurnentmust bereproducedorprocessedusingelectronicsystemswithoutprior,writienapprovai.
burster does not provide any type of warranty for this device, including any implicit warranty
concerning its general quality
or silitabilityfor a particular purpoce.
burster assumes no liability whatsoever tor errors. incidental darnage or conseguenliai darnage
arising diiringthe operation of this device.

Prözisionsmeßgerate, Sensoren und Meßsysfeme
für elektrische, thermische lind tnechnnischcGrößen
Gemäß ISO/iEC Leitfaden 22 und Eh' 45014 erkfärt
Accoding to ISOKEC grridulines 23 und E+' 44jOJ 4andord
Name des Herdters:
hfonu,ict~ircr
Adresse des Herstellers:
Adriress of rhe mnnufncNrer
da das Proda
Produkttiame: Mhhnmieter
UEC~IICS (hat rhcpd~ttr Wrh namr
RESKSTOM.4TQD
Modelloummer(n) (Typ):
,440deI /Type
Produktoptionen:
optims
mi: den folgenden Pradukt9pwifihtisnen Bbereinrtimmt
i* mnrnwidtfollo~ngspec~m'm ofproducf
Sicherheit:
ME0100 Teil 410 Abs.
Schutzmaßnahmcn; Schutz gegen gcahrtidie Körperstr6rnc
nquirmmts 4. I+AZ (IEC 64) Prorertim ogainsf elecnic rhmk
IEC 1010-1
Sieherheitsbestimmungen fin elekiriscbc Me6-, Steucr-, bgel-
W 61010-03/91 und Laborgeräte.
ME 0411 Teil 1
Sn'ip rrprniiranirnt<fw ciectrical epipmenrfor mwrumeni cnnnol
ond Idnmiory u*ed
EMC: DIN EN 50081-1 ElektromagnetircheVemXgiichkeit Fachgnuidnom StOraus-
Eiccwnmngnrtic WE0839 Teil 81-1 sendung fmcne mis3ion slnndd Pmil: in<usMal mirmenr
Raidentiol 0mnrnr~n1and Iighr hdusrry
c~n,tmiibiliw DIN EN 50082-1 Elektmmagnetische Verträglichkeit Fachgrwtdnom Stßrffftigkeit
WI? 0839 Tcil82-1
Gencric imnutiiysiandadPart Ir Residenfiul commercinl nnd lighl
indusny
ClSPR 22
Grenmrte und Mesverfahren fiii Firnknlimnpnvon infoma-
EN 55022 1987 tionitechnisehenEimichningen
VDE 0878 Teil 3 L 1/89
L.imitr and rnrthodz of measurcmenr of Rudlo Inrerfeermce choructm'stic~
ofi$omirtion Technology Equipmn~.
ErgänzendeXnformatianen :
Additional InJomation
Um optimale Srörfestigkeit zn erreichen ist das Gerät Sber geschirmteLeitungen anzuschließen.
Jn oderro mach nptimnl elechonrn,gnioticimmuni& the device hos to Or crmducted rih shiclded iine.
Gemsbacich den 30.0 1.1996 Unterschrift des Herstellers i.~k&ed Mrnann
oder EUiführers (Leitung Qüalitätswesw)
Plaec /Dnfa Signaiure ofmanttficrurw @niip Mnnoger
burr!ar prö:ii;ni.incßicch*ik gmbh 8 ra ig iotLTVV?teris~n Grtrnihnch [Pcajkicii 1437 D 76587 Gainshoch) Tnl. 9712Ai6451 Fox 645 88
Iii:;~ i/ww buriicm dr hrr>/j'w, bur<tcr.ram o-miiit info@b;jri!ar dc
SI!% dci <ir%ai!<cia!~ c.cls<k,-ach '.!RA '?DG Ps;~;~,! X~~:~.~rn~,ö- bil,iio:
V~riroll;;in~Cnibli Si:, di;! Gn$*!I?ibcii: Gcr-rSwi %!Pb 13" ~.~~~<~li
GrsihöY~iiil<rir Yiibc!' Fvi;.sr ?r;..,urinrn \44,b!n29t:7\+e1 &!war liingiar
Spo,lc~.a PoiiaaG-r-:hnrl<
K'o !iOi i5il 3, 0.17 665 500 ,(! vdbrI>:;;>i ondr?nßodeii-r-ti.~~ttttt~ xi.9 1Q2 r:ii 00 B!.T ihi Fni M i~. ii!;:oii,-
!,E hi(4 W' 038

S afeey
Introduction
Measuring Principle
Case Design
Mai~~tet~at~ce
Battery Charging
Tedinical Data
Descriptiot~ of Controls
Measureinent Cutrent
Meilxods of Measuremeaat
Oiimmeter Connections
.. . .
Remote .. . ..
. .,..
Printer Output ,
Calibration Process ,. ,
Calibration Reset
-1-

Instruments aredelivered ready for immediateuse; no extras are reqiiired.
1 Set oftest leads
1 Mains cord
I Operating Instructions (English)
)Wien unpacked, inspect for plitysical darnage and report any defects
immediately in writing, retainkg packaging materials for uispection. Before
placing ttra service, ensure mahs voltatage is correct, instruments are nonnally
suppiied fisr 240V SO&. ather voltages rnay also be selected according to
ti~e chart in section 5, (Maintenance). Be sure ta also change the fbse to tlle
conect type.
Ttiis apparatus is desigiated Safety Class I as defined in tfie IEC Pubiication
34 8
Tiiis apparatus has been designed aad tested in accordance with TEC
Pubiication 348, entitled "Saf'y Requirements for Electroilic Measuring
Apparatus", and has been supplied in a safe condition, Zie presenf
instruction manual contains some information and warnings wl~ichmust be
follawed by the user to ensure safe operation and to retain the apparatus in
safe coixiitiora.
If this apparatus is to be connected to a fixed installation, tiien before any
otlier connection is made, the protectivs eartlz terminal muse be cei-rnected to a
prote&iva condracfor.

Before switct~ingon 91e apparatus, make Surethat it is setto Phe voltage of the
power supply, Ti~e niains plug shalt only be inserted in a socket outlet
provided witli protective earth contact.
The protective action must not be
negated by the use of an extension Iead withaut a protective canductor.
WAIPNXNG!
Any interruptioti of the protective conductor inside or outside the apparatus,
or discor~nectionof tlle protective
eartll terminal is Iikely to make tlie
apparatus dangerous. Intentionalinterruptionisprohibited,
When tlis apparatus is cormeded to its mahs supply, terminals may be live,
and die opening of Covers or removal of parts (except those to &ich access
can be gained by hand) is likely toexpace livepsas,
The apparatus mud be disconnected from all voltage sources before it is
opened for
any adjustment, replacement, mafntenmce or ripair.
Aiiy adjustnient, maintenarice and repair OE tfie opened apparatus under
voltage siiall be avoided as far aspossible, and, if inevitable, shall be carried
out only by a skiiled Person who is awareof tfre hazard invoived.
Make surehat only fuses with tlia required cunent rating and of the specified
type are used for replacernent. Sl~euse of makeshifk %sec, and the short-
circuiting of fuseholders is prohibited.
Whenever it is likelytl~attheprotection has been impaired, heapparatus shall
be made inoperative and be secured against any unintended .operation and
returnedtoour factory or Agent for rectification.

The D07 is an accurate benchlportabfe Digital OL~mineter for tlle
measurement of resisbce in the range 0.1pQ to 60a. It offers yow die fottr
terminal resistance measurernent method tcr eIiininate tiie effect of Iead
resisiance. The measured vafuesare dispfayed on a 4-digit LCD display; an
overfiow ofüie celected range ic also indicated.
Simple push-button selection OE the range required, ensures that tlie D07 lnay
be easily used by unskilfed personnel. Error and status wamings are
illurninated when appropriate. The utmost care has been takeri to ensilre that
die ohrnmeter will withctand an accidental mains voltage applied to die
measuring terminals, but it is not recommended tllat voltage sIiould be applied.
Tlie measurernent is true 4 terminal, using the Kelvin principle. A stable
current is produced across the resistance to be measured via the C tem~inals,
and the voltage drop across the Rx is measured at tite P terrnitials. T~is
potential drop is then compared against ti~e voltage drop across it~ternal
standards. TSia ratio of these is then converted to the resistance val~ie of Rx
and displayed in ohrns on the digital display, High accuracy and Iong term
stability is achieved by using our owii manufactured internaI resistance
standards.
Tlie case is ruggedly construcsted fiom an ABS/polycarbanate alloy, coloured
safety yeIlow. A strong intemal sub-frame ensiires that tl~e D07 will
withstand t!~ Sizschese of environrnen:~. Ti~e front panel is a reverse printed
polycarbonats overiay with cleas and unambiguoustext.

NormaIly no mau~te~~ance is requircd other than cleaning with a rnoist ~10th.
Avoid aggressive detergents or solve~~ts.
CAUTION: Before any mak~te~~a~ailce,repair or excl~angeof parts ur fuces,
tl~e inctniinent tniist be disconnected from the mains supply
and all power sources. In the event of a fault occurring, the
uistrument sliould be retumed to our factory or Agent. A
mains fuse isfitted to the mains inlet socket on the front
panel, and should be replaced if necessary.
CAUTION: Disconnect inains lead and alI connectingleads, before
remowlg fuse Iiofder. Replace only with Sle coxect fuse
type,
ie. accordingto tlie following chart.
Voltngc EC 127
Sclectioi~ 47-G3Hz 5 x 20 mm.
87-ll0V 2.5A [T\
The iiiput circuits are protected by a 6 AMP Euse Iocated in a holder on tiie
makpritlted circuit board. Access is gained by removing thetop Cover. Only
replace with tlie correct fusetype as beiow.
10A 550V rms Type Al
BS 88 : PART 2

The D07 has built-in rechargeable sealed lead acid batteries wliich are filly
charged when delivered. To encure good service life frorn the batteries, the
D07 incorporates a sophisticated battery management System. To indicate
the state of charge, 8 LEDs kdi~trjthe remainutg battesf capacity in % OE
full charge. These LEDs are arranged in a gas gaugestyle.
.
The battery chargrjr ic built in and Zhe instment may be connected to
100/120/220 or 240 volts suppiy. The appropriate voltage setting must be
selected on the inlet socket and the correct füse inserted. The LINE LED will
iliurninate anIhe front panelto indicatewhen Sie mains supply is connected.
Charging is automatically controiled wih built-in protection circuits
eluninating the possibility of over-charging. The display wiII blank wben the
battery voltage is too Iow to sustain measurements, sid the battery state
indicators show the current state of charge. '%e D07 wili operate whilst
charging an aatl ranges except &e bottom Wo, a?c! an additional error of
approximately 8 digits may be observed with mains supply connected. The
lower ranges have a Iarger measuring current Zhan can be supplied by the
charger, and therefore baüeries must be Mly recharged before use. The
batteries will recharge in approximately six hours, and the D07 lid sliou1d be
Open to allow for maximum ventilation.
The internal batteries are, a sealed lead acid type. Care should be taken when
disposing of&em and they may be returned to Cropico for safe disposai.
Any regulations and directions applying to the disposal of sucii material must
be applied.
Do not dispose ofbattery in
fire.

Do not short circuit.
Do not cmsh, puncture, Open, dismantle or othehse rnechanically interfere
with fixe battery.
DigitalDisplay :
Normal temperature :
Storagetemperature :
Mains connection
Size (m~n.)
Mzss
4 digit, LCD 0.8"height;
6000 comt with automatic
deckal point: and error
warning lamps
0...+40°C rel.
humidity max. 80%
8.3 Kgs.

Measuring time
Polanty
True four-tenrtinal ilieasurenzent
witil f~eddcmeasuring curre~lts,
Approx. 0.5 seconds
Forward and reverse ineasurement
cuneilt may be selected, plus
average lnode whicli autamaticaily
disphys Sie average value af
positive and negativepolarity
measurement.
* NO'iE Tanperature dhent in bc added LO uticertairtty wtlai. opsatuig ouiiida ihe range i 5 to 25°C
UncerQinty
At ZO°C G°C, 1 Yenr
*(O.ZS%Rdg + 0.02%FS)
&(0.25%Rdg i- 0.03%1;5)
1(0.25S'oRdg .e O.l%FS)
4(0.25%Rdg + O.l%FS)
*(0.25%tldy i O.l%FS)
i(0.250,'oItdg + 0.i%FS)
NOTE: Measurements on the lowest range 600pC2 will have an additional
Zero offset of up to 20 digitc, if the measuring current is applied for long
periods. Tliis offset can be eIuninated by using the averagemeasuring rnode.
Teliipct.iiturc
. Co-cfilciciltJOl'~-
25 ppin Rdg i- 2 ~PI~I FS
25 ppiii Rdg + 10 pp~il FS
25 ppln Rdg + 90 pprti I;S
25 ppni Rdg i- 90 ppm FS
25 pptii ILdg + 90 pptn FS
25 pprti ltdg + 90['pni FS

4 DIGIT STATUS WARNING
LCD DISPLAY
.\
ONIOFF
POWER SWITCH
CALIBRATION
Fig. 8-1 Description of Contrals
-9-

The nieasuring current polarity may be selected from the front panel. The
display will indicate either + or - to denote tbe current flow. This is
particularly usef2i1 when evaluating circults with theniiaI emf or where diode
effects can infiuence the measurement. For measurements wfiere tliermal emf
can cause a large measuring Zero error, we have provided an additional
automatic average button, When pressed, the measuring current
will
automatically be reversed and the average value displayed, ttlus eliminating
tfie need for extemal ¢omputations. This average facility will also adjust the
rneasurementtime automaticaify, thus giving the fastestpossible measurernent
even on inductive circuits.
'ille +ve and -ve lamps will light to indicate that the current polarity is
changing. For very unsiable values wl~erethe average mode is unable to
establich a dblereading, the averaging will be aborted aAer approxiinately
25 ceconds and the display will indicate - - - - A new average cycle will be
automaticaIIyinitialised.
Tlie 6 ranges may be selected mmuafly by simply pressirig the desired range
button. The selected
range will be indicated by an LED and over-range will
be indicatedby the displayreading - - - -.
TI-iese LEDs will light to indicate the ulstrument Status.,
LINE : Mains supply is connected to the instrument..
CAL : Calibration mode has been initialised by
the key switch and the instnrment is in
calibration mode.

O/C One of
the measuringleads is Open circuit
LEAD : (too high resistance), ornot connected to
test sample correctly, orthe internalprotection
fuse is Open circuit. The Iamp will aIways
light in standby mode.
Ti~eDigitaI Ohmmeter type D07 employs a four wire m&od of
measurernent, ie. it is necessary to make four connections to the resistor under
test. The instrument is supplied with four leads; two for the potential
connections
whici~ are made across the test resfstor at tbe points between
wliich the resistance is tobe determined; and two for the current connecfions
which connectsff~etest resistor to the ct~pplycircuit.
a> Connect the black leadsto the Cl and
P1 teeals,and the red leads
toterminals C2 and P2.
b) Clip on tothe resistor under test
(fig. 9-1). Cleanliness is important
and if the sample is not clean, a rub with an abrasivepaper to remove
oxides is recommended.
C>
Xt is not aiways possible to usethe combined current and potential
clips, h which case test leads with spade tags or specialtest fixtures
rnay have to be made for the User to suitparticular applications.
d>
Fig. 9-2 ill~~stratesconnectionsto various types oftest resistors,
4
Wheri meas~~ring 4-tenninal resistancestandards, do nat use the
combined current and potentialprobes. Make four separate
co~lnections to the ciirrent and potential terminals

Fig. 9.1 Combined current and potential probes
I COnnectioas tO Cablc Joint I
Connections ix Cumnt Shunt
Fig. 9.2 Various types of resistors

When the D07 is first switched on, a lamp test is automatically perfomed.
All disptay Segments are illuminated foIlowed by each LED ligllting in
sequence. NOTE the LOCK LEI) is not fitted and wiltl therefore will NOT
light. The microprocessor checks for correct intemal operation and indicates
"P" if all tests pass O.K. At the Same time the sohare version will be
displayed and held for approximately 2 secondc. The display will typically
read "P 1.1". Should the intemal checks indicate an error, tben t41e display
will read "HELP". TorectiQthis, See section 13.
The D07 will perfom an automatic zero sequence and finaiiy sets to the
followingdefauit start-up mode ready for use. The selected measuring range
will be
60Q, and the D07 willthen be in stand-bymode.
Connect the resistance to be measured (Rx) to the measurhg terrninals in
accordance with the diagram on the instnrment pmel. Select the range
required, the measurement rnode, ie. t, - or average. The LED famp will light
to u~dicate which buttons are active. To initialiseIhe measurement, press and
hold the ON button, the rneasurement will cease once this button is released
and the instrument will return to the STANI>BY state. Should you wish to
initialise a continuous reading, then press the LOCK + ON butto11s. The
rneasurement will continue until the STANDBY button is pressed or the ON
button pressed again. An audible BLEEP will sound during this time to warn
the operator that measurement is still in Progress, and up to f O Arnps
measuring current is drainiig the batieries,
The display will indicate - -- -.
Select a lower range.

O/C LEAD will be displayed arid üle display will indicate - - - - if the
instrument detects that the Iead resistance is too high. The C teminals are
checked for compliance voftage. Mmsurement should not be made if this
warning message is displayed. This waming will also be displayed if the
intemaf protection hse is open-circuit. Wenin STANDBY mode this LED
will always be lit.
Menmaking good quality measurernents, it is important to ensure that all
measuring leads are in good condition, and less &an 0.2 ohsresisbnce.
It should also be noted that some spade tags and crocodile clips can produce
high tliermai ernfs when wamed, particularly nickei-plated brass types. This
can cause problems when, for example, connecting too hot motor windings.
The solution is to use plain copper or brass connections keeping ihem clean
and oxide-free.
If a footcwitch or other simifar extemal switch is plugged into the REMOTE
socket, it will behave as an ON key. This feaiure is particularly useful when
used with the PRINT LAST function to enable "hands free" operation during
measurernent, wkh the results priuted on an externa! printer. For switch
connections see page 27.

13.
The print format will be as foIlows:
SIGN VALUEl UNIT (measuhg mode)
exampie: 1-600.0 m ohm (+ve)
-600.0 m ohrn (-ve)
600.0 m ohrn (Ave)
The value printed will be followed by a line feed carriageretum.
ShouId the instrument display read over-rangethm &e value will be prkted as
-....-
For cable connection details See page 27.
AI1 measured vaiues will be sent to the ~ruiterport (RS232) when "ON". This
key toggles ONIOFP.
The last meacured vaIue onIy will be sent to the pder port (RS232). This is
defuled as the last value measured when switcbing from "ON" to "STBY".
This keytoggles ON/OFF.
This key wili display the currently set value when pressed. To change the
value, press CLE to cfear and tllen use rhe keyboard to enter the new value,
finishing with OK. If the new entered value is a valid rate, then it will be
stored and retained in the NVRAM. If it is invalid a long bleep will somd and
ii will reset tothe last value. The valid Baud Rates are: 75, 110, 150, 300,
600, 1200, 2400, 4800, 9600, 19200. The famat is fixed at 8-bit data, 1
Start bit, 1 stop bit and no parity,

Every effort has been made to protect the instrurnerit against voltagec being
applied to the terminals. A Iarge 6 Amp fuse is fitted internälly to the C
measuring line and a gas dischargetube, GDT, is acrosc the C terminals. If
voltages above approximately 90V are appliedtoSiemeasuringtemhals, the
GDT will strike, effectively shoriing the C terminals through the 6 Amp
protective fuse, which wil1intemptthe circuit.
'The fbse fitted will intemipt up to 40,000 Amps. The P terminals are not
fused and will withstand up Lo 460Volts without damagetothe inctniment.
To repIace the prutection Fuse, the top instniment panel should be removed,
but only after rlre mains supply and all input connecfions ure removed.
Ti~eprotection fuse is located on the main printed circuit board. Only replace
with the correct fuserating.
Tfiis procedure describes the standard calibration method for the D07
Ofmeter using Cropico Calibration Rig Type MTSZ. If discrete resistance
standardsareto be used instead, refer to section 21 beforeproceeding.
ff the calibration Stores are to be pre-set or erased, use the special opemtian
descnbed in section 6 (CAL RESET).
The D07 will be factory-calibrated to its full accuracy when delivered and
any recaIibration by the User will invalidate this initial calibration. The User
should therefore be certain that only authorised and competent persomel are
perxnitted accesstothe calibration facility, which is key protected. .