Polar Instruments TONEOHM 850A Operator's Manual
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Polar Instruments TONEOHM 850A Operator's Manual

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  • Page 1 (217) 352-9330 | Click HERE Find the Polar Toneohm 850A at our website:...
  • Page 2 Polar Instruments Ltd. TONEOHM 850A Garenne Park Rue de la Cache OPERATOR St. Sampson Guernsey MANUAL Channel Islands GY2 4AF England http://www.polar.co.uk Fax: +44 (0)1481 252476 Email: mail@polar.co.uk MAN 150-9803 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 4 TONEOHM 850A SHORTS LOCATOR OPERATOR MANUAL POLAR INSTRUMENTS LTD. HARDWARE WARRANTY Product Warranty. Product hardware is warranted to be free from defects in material and workmanship during the Warranty Period (as defined below). Product hardware is warranted to conform substantially to Polar’s then current (as of the date of Polar’s product shipment) published user documentation during the Warranty Period.

  • Page 5: Declarations

    TONEOHM 850A OPERATOR MANUAL DECLARATIONS European Community Directive Conformance Statement This product conforms to all applicable EC Council Directives, including: EC Council Directive 89/336/EEC on the approximation of the laws of the Member States relating to electromagnetic compatibility. EC Council Directive 73/23/EEC on the harmonisation of the laws of the Member States relating to electrical equipment designed for use within certain voltage limits.

  • Page 6: Safety

    INTRODUCTION SAFETY WARNING The LIVE and NEUTRAL lines on this unit are BOTH fused. This unit contains no user-serviceable parts. When the unit is connected to its supply, the opening of covers or removal of panels is likely to expose dangerous voltages. To maintain operator safety, do not operate the unit unless the enclosure is complete and securely assembled.

  • Page 7: Power Supply

    Retain these instructions for later use. The TONEOHM 850A is designed for use indoors in an electrical workshop environment at a stable work station comprising a bench or similar work surface.

  • Page 8: Specifications

    INTRODUCTION SPECIFICATIONS Resistance Ranges Number of Ranges Hi sensitivity Ω Approx. 40mΩ, uncalibrated 200mΩ 200mΩ, 4% 2Ω 2Ω, 4% 200Ω 200Ω, 4% 20kΩ 20kΩ, 4% Probe tip voltage 60mV max. Probe Protection Momentary contact to 100V Voltage Ranges 2mV, 4%, ±15µV (Rin=120Ω) 20mV 20mV, 4%, ±15µV (Rin=120Ω) 2V, 4%, ±15µV (Rin=1MΩ)

  • Page 9: Symbols

    TONEOHM 850A OPERATOR MANUAL Power Requirements 230V ± 10%, 115V ± 10% or 100V ± 10% at 50/60Hz, 15VA. Physical characteristics (excluding accessories) Dimensions 300 mm (11.8 in.) wide 110 mm (4.4 in.) high 260 mm (10.3 in.) deep Weight 1.5 kg (3.3 lb.)
  • Page 10 INTRODUCTION GUIDE TO THE MANUAL INTRODUCTION An overview of the Polar TONEOHM 850A shorts locator and its applications. GENERAL DESCRIPTION The principles of operation of the TONEOHM 850A; selecting the operating mode for different types of short circuit. Front and rear panel connectors.

  • Page 11: Table Of Contents

    Standard Accessories .......................... vi SYMBOLS..............................vi SECTION 1 – INTRODUCTION ........................1-1 INTRODUCTION TO THE TONEOHM 850A ..................1-1 1-1 Using the TONEOHM 850A to locate short circuits ..............1-1 TONEOHM 850A applications ....................1-1 TONEOHM 850A display mechanisms ..................1-1 SECTION 2 – DESCRIPTION ........................2-1 LOCATING SHORT CIRCUITS WITH THE TONEOHM 850A .............2-1...
  • Page 12 INTRODUCTION SECTION 4 – MILLIOHMMETER ......................4-1 LOCATING SOLDER AND LAND BRIDGES ..................4-1 4.1 (Low resistance) shorts........................4-1 Tracing faults on double sided boards ..................4-1 SECTION 5 – TRACK VOLTAGE......................5-1 USING TRACK VOLTAGE TO LOCATE LOADING FAULTS ..............5-1 5-1 TRACK VOLTAGE shorts locating mode ..................5-1 Static faults ..........................5-1 Excessive Vcc Loads .........................5-1 Dynamic faults ...........................5-2...
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  • Page 14: Section 1 - Introduction

    Current Trace Non-contact current tracing where access to tracks or components is difficult. TONEOHM 850A applications The high accuracy of the TONEOHM 850A allows it to be used for a wide variety of applications requiring low resistance measurements: • Continuity testing •...
  • Page 15 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 16: Section 2 - Description

    LOCATING SHORT CIRCUITS WITH THE TONEOHM 850A TONEOHM 850A shorts locating modes The TONEOHM 850A provides three shorts locating modes to enable the user to physically locate any type of short circuit without lifting components, cutting tracks or otherwise damaging the board under test:...

  • Page 17: Track Voltage Range Switches

    When the headphones are connected to this socket the internal speaker is switched off and the tone switched to the headphones. Use only 3.5mm stereo jack plugs in this socket. The TONEOHM 850A is supplied with two sets of probes and Drive Source leads. Each probe fits into a unique socket on the front panel.

  • Page 18: Needle Probes

    DESCRIPTION Needle probes The Needle Probes are used in all ranges except TRACE. The red (positive) and black (negative) markings on the probes indicate direction of current flow Track Voltage. Rear Panel controls and connectors The rear panel accommodates the push button (push-on/push-off) ON/OFF mains power switch and the IEC mains inlet connector.
  • Page 19 TONEOHM 850A OPERATOR MANUAL The table below indicates the suggested range for locating different types of short circuit. Type of fault Range Drive Source Used PCB Powered Ω, 200mΩ Shorts below 200mΩ Excessive Vcc loads (static) 2mV/20mV Excessive Vcc loads (dynamic)

  • Page 20: Section 3 - Installation And Set-Up

    Note: If the instrument has been shipped or stored in a cold environment, allow the instrument to reach the temperature of its new location before applying power. Connecting the TONEOHM 850A to a power supply Refer to the voltage label on the rear panel of the instrument and make sure that the marked rating is suitable for the local mains power supply.
  • Page 21 TONEOHM 850A OPERATOR MANUAL Check that the TONEOHM 850A mains switch (on the rear panel) is OFF. Plug the power cable into the receptacle on the rear panel of the TONEOHM 850A. Plug the other end into a wall outlet.

  • Page 22: Section 4 - Milliohmmeter

    SECTION 4 – MILLIOHMMETER LOCATING SOLDER AND LAND BRIDGES NOTE: Disconnect power from the board under test before using any of the resistance ranges. (Low resistance) shorts Low resistance shorts are shorts having a resistance under 200 mΩ, caused typically by a solder or land bridge.
  • Page 23 TONEOHM 850A OPERATOR MANUAL Example Fig 4-1 illustrates a circuit in which a short circuit exists between the output of U1 and the input of U2. Board power is disconnected, and the Needle Probes are placed at points A and E. The low resistance between the tracks via the short results in a meter reading and an audible tone.

  • Page 24: Section 5 - Track Voltage

    TERMINAL AND GROUND TRACK VOLTAGE shorts locating mode The TONEOHM 850A TRACK VOLTAGE shorts locating mode allows the operator to trace current through a printed circuit board track from the voltage drop along sections of the track. The displayed value and tone correspond to the voltage along the track. This voltage is proportional to the current flowing through the track, but will also vary with the distance between the probes and the resistance of the track (e.g.

  • Page 25: Dynamic Faults

    TONEOHM 850A OPERATOR MANUAL Example Consider the board shown in Fig 5-1 where the Vcc supply is being loaded. Assume the fault is static and the tracks are wide, i.e. very low resistance. DRIVE SOURCE Fig 5-1 Track Voltage Measurement 1.
  • Page 26 VOLTAGE MEASUREMENT For a dynamic fault it will be necessary to test the board in its powered up state. In this case the current flow that is traced will be a combination of the “normal” load to devices connected to the supply and the excess current due to the fault.
  • Page 27 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 28: Section 6 - Current Tracing

    When using TRACE the current must be supplied by the Drive Source leads. Using the 850A Drive Source The TONEOHM 850A’s Drive Source drives current through the circuit under test and the resulting magnetic field may be detected using the Current Trace Probe.

  • Page 29: Connection And Sensitivity Adjustment

    TONEOHM 850A OPERATOR MANUAL Connection and Sensitivity Adjustment Connect the Drive Source leads across the shorted tracks and turn the Drive Source control fully clockwise. The most effective way to use TRACE is to connect leads 10–20mm apart on the board under test.

  • Page 30: Bus Faults (Stuck Nodes)

    CURRENT TRACING DRIVE SOURCE Fig 6-1 Board Sectoring 2. Connect the Drive Source Leads 10–20mm apart near one corner of the board (Sector 3 in the illustration). 3. Move the Trace Probe along the lines AB, then along CD to determine if current is flowing out of Sector 3 into the other sectors.
  • Page 31 TONEOHM 850A OPERATOR MANUAL 1. Connect the Drive Source leads across the faulty lines. 2. Adjust the Drive Source control so that the Trace Probe responds within 10mm of one of the Drive Source leads. 3. Pass the Probe over each suspect IC, with the thickest sides of the probe tip parallel to the IC pin sides.

  • Page 32: Edge Connectors

    CURRENT TRACING Edge Connectors Shorts between two pins of a row of edge connectors can be detected by connecting the Drive Source as shown in Fig 6-2. SHORT DRIVE SOURCE Fig 6-2 Edge Connector Shorts 1. Adjust the Drive Source control to give a reading with the Current Trace Probe at edge connector height.

  • Page 33: Faulty Decoupling Capacitors

    TONEOHM 850A OPERATOR MANUAL Faulty Decoupling Capacitors In certain situations TRACE can help to identify an open circuit decoupling capacitor. Fig 6-3 is typical of many circuit configurations. DRIVE SOURCE Fig 6-3 Isolation of open circuit decoupling capacitor As the Drive Source is AC in TRACE, each capacitor conducts some current.

  • Page 34: Section 7 - Simple Maintenance And Cleaning

    Service Manual to assist the service technician. Cleaning Clean the TONEOHM 850A with a cloth lightly moistened with water with a small amount of mild detergent. Alternatively, a cloth lightly moistened with alcohol (ethanol or methylated spirit) or isopropyl alcohol (IPA) may be used.
  • Page 35 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 36 Mesure de courant sans contact, pour les cas d'inaccessibilité aux pistes ou aux composants. Le TONEOHM 850A possède un afficheur LCD et un signal sonore à tonalité variable pour indiquer la proximité du court-circuit. Cette aide sonore permet à l'opérateur de progresser dans la recherche sans quitter les pistes des yeux.
  • Page 37 TONEOHM 850A – GUIDE UTILISATEUR • Est-ce-que le défaut est "statique" ? Utiliser le milliohmètre. Est-ce-que le défaut est "dynamique? (apparaît-il seulement quand la carte est alimentée) Utiliser le mode tension de piste • Si l'accès est difficile il sera préférable de prendre la fonction traceur de courant.
  • Page 38 UTILISATION DE LA MESURE DE TENSION DE PISTE POUR LOCALISER DES DEFAUTS DE SURCHARGE COURT-CIRCUIT Fig 1 Court-circuit franc UTILISATION DE LA MESURE DE TENSION DE PISTE POUR LOCALISER DES DEFAUTS DE SURCHARGE ATTENTION : NE PAS APPLIQUER PLUS DE 50V ENTRE SONDE ET MASSE Le mode TENSION DE PISTE (TRACK VOLTAGE) Ce mode permet à...
  • Page 39 TONEOHM 850A – GUIDE UTILISATEUR DRIVE SOURCE MASSE Fig 2 Mesure de la tension de piste • Connecter les fils source entre le VCC et la masse. • Enfoncer la touche 2mV et positionner le niveau de la source au maximum •...
  • Page 40 TRACEUR DE COURANT SANS CONTACT TRACEUR DE COURANT SANS CONTACT NOTE: Mettre la carte hors tension avant d'utiliser la fonction TRACE Utilisation de la source de courant du 850A La fonction TRACE consiste à injecter un courant dans la carte par les fils rouge et noir et à le détecter avec la sonde de courant, par induction.
  • Page 41 TONEOHM 850A – GUIDE UTILISATEUR DRIVE SOURCE Fig 3 Découpage de la carte • 1. La carte est d'abord divisée en quatre secteurs (Fig 3). • 2. Brancher les fils source à 10-20mm l'un de l'autre près des coins de la carte (secteur 3 sur le dessin).
  • Page 42 TRACEUR DE COURANT SANS CONTACT COURT-CIRCUIT DRIVE SOURCE Fig 4 Court-circuit sur connecteur • Ajuster le niveau de la source de façon à détecter le courant à hauteur des connecteurs. • Déplacer la sonde entre chaque connecteur en commençant par le plus proche des fils de source.
  • Page 43 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 44 Vergewissern Sie sich, ob die auf der Geräterückseite aufgedruckte Netzspannung mit der lokalen Netzversorgung übereinstimmt ! Überprüfen Sie, ob der Netzschalter des TONEOHM 850A (auf der Geräterückseite) in der Stellung OFF steht. Schließen Sie nun das Netzkabel in die zugehörige Buchse auf der Geräterückseite an. Stecken Sie zuletzt den Netzstecker in eine Wandsteckdose.
  • Page 45 TONEOHM 850A KURZANLEITUNG • Ist der Kurzschluß niederohmig (d.h. kleiner als 200mΩ)? • Ist der Fehler "statisch" (immer vorhanden)? Verwenden Sie die Milliohmmeter- Technik • Ist der Fehler "dynamisch" (nur vorhanden, wenn Baugruppe unter Spannung)? Verwenden Sie die Betriebsart TRACK VOLTAGE (Stromverfolgung) •...
  • Page 46 MILLIOHMMETER – LOKALISIEREN VON ZINN- UND KUPFERBRÜCKEN MILLIOHMMETER – LOKALISIEREN VON ZINN- UND KUPFERBRÜCKEN HINWEIS: Entfernen Sie jegliche Versorgungsspannung vom Testobjekt, bevor Sie einen der Widerstandsbereiche anwenden ! Niederohmige Kurzschlüsse Verwenden Sie den 200mΩ-Bereich für niederohmige Kurzschlüsse (für Widerstände unter 200mΩ, z.B. bei Lötzinn- oder Kupferbrücken zwischen benachbarten Leiterbahnen oder Lötaugen).
  • Page 47 TONEOHM 850A KURZANLEITUNG LOKALISIEREN VON FEHLLASTEN MITTELS TRACK VOLTAGE HINWEIS: DER SPANNUNGSUNTERSCHIED ZWISCHEN BEIDEN PRÜFSPITZE GEGENÜBER MASSE DARF 50V NICHT ÜBERSCHREITEN ! Die Kurzschlußlokalisierung mittels Spannungsfolger ermöglicht die Verfolgung von Strömen auf einer Platine durch den entstehenden Spannungsabfall an den Leiterbahnen. Der Anzeigewert und der abgegebene Ton entspricht der Höhe des gemessenen Spannungsabfalls an einer Leiterbahn.
  • Page 48 Anwendung von TRACE. Verwenden der TONEOHM 850A Drive Source Die Drive Source des TONEOHM 850A speist die zu testende Schaltung über die Drive Source- Anschlußkabel (rot und schwarz), das resultierende Magnetfeld kann mit der Stromfolgersonde detektiert werden kann. Die Sonde ist auf die Frequenz des Wechselstroms eingestellt, den die Drive Source liefert.
  • Page 49 TONEOHM 850A KURZANLEITUNG die schwarze Linie auf der Spitze der Sonde zeigt in Richtung der zu testenden Leiterbahn. Das Ergebnis ist ein schnell ansteigender Anzeigewert bzw. ein rascher Anstieg der Testtonhöhe. Anschluß und Empfindlichkeitseinstellung Die effizienteste Art des Anschlusses ist auf einer Seite der Platine mit einem Abstand der Kabel von 10- 20mm.
  • Page 50 KONTAKTLOSE STROMVERFOLGUNG DRIVE SOURCE Abb. 3 Board Sectoring Leiterplatten-Steckverbinder Kurzschlüsse zwischen zwei Pins einer Reihe von Leiterplatten-Steckverbindern werden durch die in Abb. 4 gezeigten Anschlußart der Drive Source Klemmen lokalisiert: • Stellen Sie die Drive Source derart ein, daß eine Anzeige erscheint, wenn die Sonde in Höhe der Steckverbinder gehalten wird.
  • Page 51 TONEOHM 850A KURZANLEITUNG KURZSCHLUß DRIVE SOURCE Abb. 4 Kurzschlüsse an Leiterplatten-Steckverbindern Hinweis: Wäre der Kurzschluß bereits bei dem den Anschlußklemmen am nächsten liegenden Stecker, so wäre bereits zwischen Stecker 1 und 2 kein Ton mehr hörbar. Kurzschlüsse zwischen Busleitungen Die Testmethode TRACE eignet sich überall dort, wo statische Kurzschlüsse und keine Parallelkondensatoren vorhanden sind.
  • Page 52 Controllare che l'interruttore di accensione dello strumento (posto sul pannello posteriore) sia "OFF". Inserire il cavo di rete nella presa posta nel pannello posteriore del TONEOHM 850A. Inserire la spina in una presa di rete.
  • Page 53 TONEOHM 850A – GUIDA PER L'UTILIZZATORE Selezione del modo e della portata Quando occorre selezionare la portata e' necessario considerare le seguenti domande: • Il difetto e' un corto circuito a bassa resistenza (per esempio inferiore a 200mΩ)? • Il difetto e' statico (sempre presente)? Utilizzare la tecnica Milliommetro.
  • Page 54 MILLIOMMETRO, LOCALIZZAZIONE DI CORTO CIRCUITI (PONTI DI STAGNO E DEPOSITI CONDUTTIVI) MILLIOMMETRO, LOCALIZZAZIONE DI CORTO CIRCUITI (PONTI DI STAGNO E DEPOSITI CONDUTTIVI) NOTA: Scollegare l'alimentazione dalla scheda sotto test prima di utilizzare una qualsiasi portata per la misura di resistenza. Corto circuiti di bassa resistenza Utilizzare la portata 200mohm per cortocircuiti a bassa resistenza (con resistenze inferiori a 200mohm, ad esempio ponti stagno e depositi conduttivi tra piste adiacenti o punti di saldatura).
  • Page 55 TONEOHM 850A – GUIDA PER L'UTILIZZATORE UTILIZZO DEL MODO TRACK VOLTAGE PER LOCALIZZARE DIFETTI DI CARICAMENTO Attenzione: non superare i 50V tra i puntali e massa Localizzazione di corto circuiti in modo TRACK VOLTAGE Utilizzare questo modo per localizzare la corrente circolante tra le piste misurando la caduta di tensione attraverso la sezione delle piste.
  • Page 56 NOTA: Scollegare l'alimentazione della scheda prima di utilizzare il modo TRACE. Utilizzo dei DRIVE SOURCE dell'850a I DRIVE SOURCE del TONEOHM 850A applicano la corrente alla scheda da controllare attraverso le terminazioni DRIVE SOURCE (una coppia di CLIP rossa e nera) e il risultante campo magnetico puo' essere rilevato dal puntale CURRENT TRACE.
  • Page 57 TONEOHM 850A – GUIDA PER L'UTILIZZATORE Regolazione della sensibilita' e collegamento dei puntali Il modo migliore per utilizzare il modo TRACE e' collegare le terminazioni separate da 10-20 mm sulla scheda sotto test, non collegare le terminazioni agli angoli opposti della scheda. Collegare le terminazioni dei DRIVE SOURCE sopra la pista in corto circuito e regolare il controllo del DRIVE SOURCE completamente in senso orario.
  • Page 58 LOCALIZZAZIONE DELLA CORRENTE (CURRENT TRACE) SENZA CONTATTAZIONE DRIVE SOURCE Figura 3, Divisione della scheda in settori • Muovere le terminazioni DRIVE SOURCE sino a che non si individua il settore al di fuori del quale la corrente non circola. Il corto circuito e' posizionato all'interno della sezione individuata.
  • Page 59 TONEOHM 850A – GUIDA PER L'UTILIZZATORE CORTO DRIVE SOURCE Figura 4, Corto circuiti sui connettori piatti Occorre segnalare che se il corto si trova su un connettore vicino alle terminazioni DRIVE SOURCE, nessun tono potra' essere generato quando il puntale viene spostato tra il connettore 1 e 2.

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