VC250 - Multimeter VOLTCRAFT - Free user manual and instructions

USER MANUAL VC250 VOLTCRAFT

These operating instructions belong with this product. They contain important information for putting it into service and operating it. This should be noted also when this product 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 29.

• 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. We are certain: Your starting to use Voltcraft will also be the beginning of a long, successful relation- ship. We hope you will enjoy using your new Voltcraft® product! If there are any technical questions, contact: Germany: Tel. no.: +49 9604 / 40 88 80 Fax. no.: +49 9604 / 40 88 48 E-mail: tkb@conrad.de Mon. to Thur. 8.00am to 4.30pm, Fri. 8.00am to 2.00pm29 Table of Contents Introduction p. 28
• Intended Use p. 30
• Controls p. 31
• Safety Instructions p. 32
• Product Description p. 34
• Delivery Contents p. 35
• Display Information and Symbols p. 36
• Measuring Mode p. 37
• a) Switching on the Measuring Instrument p. 37
• b) Measuring Voltage “V” p. 38
• c) Measuring Current “A” p. 38
• d) Measuring Frequency “ (only VC270 and VC290) p. 40
• e) Measuring Resistance p. 40
• f) Diode Test p. 41
• g) Continuity Check p. 41
• h) Measuring Capacity (only VC270 and VC290) p. 42
• i) Battery Test “ (only VC250) p. 42
• REL Function (only VC270 and VC290) p. 43
• HOLD Function (only VC290) p. 43
• Low Imp. 400 kΩ Function (only VC250 and VC270) p. 43
• Auto-Power-Off Function (only VC270 and VC290) p. 43
• Cleaning and Maintenance p. 44
• General p. 44
• Cleaning p. 44
• Opening the Measuring Instrument p. 44
• Changing the Fuse p. 45
• Inserting and Changing the Battery (only VC250 and VC270) p. 46
• Charging the VC290 p. 46
• Disposal p. 47
• a) Product p. 47
• b) Batteries/rechargeable batteries p. 47
• Troubleshooting p. 48
• Technical Data 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 voltage up to a maximum of 600V - Measurement of direct and alternating current up to a maximum of 10 A - Frequency measurement to 10 MHz (only VC270 and VC290) - Capacity measurement to 100 µF (only VC270 and VC290) - Measurement of Resistance to 40 MΩ (VC250 max. 20 MΩ) - Battery Test for 1.5 and 9V Batteries (only VC250) - Continuity check (< 10 Ω acoustic) - Diode Test The measurement functions are selected using the dial switch. With the VC250 the selection of the measurement range is made manually, for the VC270 and VC290 the automatic measurement range selection is active in all measurement ranges (except current measurement ranges). The two current measuring inputs are secured against overload. The voltage in the measuring circuit may not exceed 600 V. The two current measuring inputs are secured with ceramic high performance fuses. The VC270 has a self-resetting PTC fuse in the mA/µA measurement range. A low-impedance function (Low-Imp) in the VC250 and VC270 allows measurement with reduced internal resistance. This suppresses phantom charges which can occur in high Ohm measurements. Measurement with reduced impedance is only allowed in measurement circuits up to max. 250 V and for a max. of 3 seconds. VC250 and VC270 are operated with one standard 9v block battery. The device may only be operat- ed with the specified batteries. Power for the VC290 is provided by an inbuilt high-capacity capacitor. Charging is carried out via a mains power source 230 V/AC. During measurements, if there is sufficient light supplied (halogen/daylight or sunlight), the capacitor is buffered by an inbuilt solar cell and the operation time per charge is increased. The measuring instrument must not be operated when it is open, i.e. with an open battery compart- ment or when the battery compartment cover is missing. Measuring in damp rooms or under unfavourable ambient conditions is not admissible. Adverse ambient conditions include: - Excessive dampness or humidity, - 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!31 Controls (see fold-out page) 1 Spray-on rubber protection 2 Display with connection description 3 Operation switch on VC250 REL button on VC270/VC290 4 Dial switch 5 mAµA measuring socket 6 10 A measuring socket 7VΩ measuring socket (“plus” when DC) 8 COM measuring socket (reference potential/ground, “minus”) 9 Function button: SELECT button for function switching in the VC270 Hold button to hold a measured value in the VC290 10 Low Imp. 400 kΩ buttom for impedance switching in VC250 and VC270 SELECT button for function switching in the VC290 11 Solar cell for buffering inbuilt capacitor (only VC290) 12 Cover, no function. 13 Tripod connection 14 Battery compartment screw 15 Foldable setup brackets 16 Battery compartment (only VC250 and VC270) 17 Battery and fuse compartment 18 F2 current fuse (self resetting on VC270) 19 F1 current fuse Probe assemblies to be used for MAINS measurements shall be RATED as appropriate for MEASUREMENT CATEGORY III or IV according to IEC/EN 61010-031 and shall have a voltage RATING of at least the voltage of the circuit to be measured.32 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 con- sequential 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 warranty/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 contained 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. The triangle containing a lightning symbol warns of danger of an electric shock or of the impairment of the electrical safety of the device. The “arrow” 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 connected to the mains supply with a power 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. sockets or sub-distrib- ution). This category also covers all smaller categories (e.g. CAT II for measuring elec- tronic devices). Earth potential For safety and licensing reasons (CE), unauthorised conversion and/or modification of the device is not permitted. °33 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 measuring instrument connection points and earth must never exceed 600 V DC/AC in CAT III. 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 volt- ages it is possible to get a fatal electric shock if you touch electrical conductors. Prior to each measurement, check your instrument, including its measuring lines, for any damage. Never 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- energy overloads!). Please make sure that your hands, your shoes, your clothing, the floor, switches and switching components are dry. Avoid operation in the immediate vicinity of: - strong magnetic or electromagnetic fields - transmitting 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 immedi- ately 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, - it does not function any longer and - after it was stored under unfavourable conditions for a long period of time or - after it was exposed to extraordinary stress caused by transport. 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 the packaging material lying around carelessly since such materials can become dan- gerous toys in the hands of children. You should also heed the safety instructions in each chapter of these instructions.34 Product Description The multimeter (referred to as DMM in the following) indicates measured values on the digital display. The display of measured values on the DMM consists of 2000 counts on the VC250 and 4000 counts on the VC270 and VC290 (Count = smallest display value). The VC250 and VC270 also show the measurement socket to be utilised for each measurement range in the display. If the DMMs are not operated for approx. 30 minutes, they automatically switch off. This saves battery power and extends the period of operation. The automatic shut-off can be manual- ly deactivated. The measuring device 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. The mA/µA measurement range on the VC270 has a new feature. With this measuring device, it is no longer necessary to replace a fuse that has accidentally tripped. The installed PTC fuse resets auto- matically after tripping. The battery and fuse compartment can only be opened if all measurement leads are removed from the measuring device. It is not possible to insert the measurement cables into the measurement sockets if the battery compartment and fuse compartment are open. This increases the security of the user. Dial switch (4) The individual measuring functions are selected via a dial switch. The VC270 and VC290 have activated automatic range selection “Autorange”. The appropriate range of measurement is set for each application individually. On the VC250 the measurement ranges must be set manually. Always start measurements at the highest measurement range and switch down to lower ranges if necessary. The VC270 and VC290 have a function button on the dial switch (9). With this button on the VC270 you switch to a sub-function (SELECT), if the measuring function is double assigned (e.g. switching resistance measuring - diode test and continuity test or AC/DC switching in the voltage range). On the VC290 this button operates as Data Hold, to hold the current measured value. Each press switches the function. The VC270 and VC290 meter is switched off when the switch is in the “OFF” position. Always turn the device off when it is not in use.35 Display (2) The VC200 series meters differ in both measuring function and in the display. The following figure gives a general overview of the display elements for your DMM. Delivery Content Multimeter with spray-on rubber protection 9V Block battery (not in VC290) Safety measuring cable Operating Instructions36 Display indications and symbols The symbol and indications are different depending on the model. This is a summary of all possible symbols and indications for the VC200 series. Delta symbol for relative value measuring (= reference value measuring) Autorange/AUTO stands for “automatic measurement range selection” Connect terminal Graphic notice to select the required measuring sockets H Data-Hold function is active OL or 1. Overload = the measuring range was exceeded Symbol for the operation switch. Pressed in is switched on. Battery replacement symbol; please replace the batteries immediately to avoid measuring errors! Symbol for the diode test Symbol for the acoustic continuity tester AC Alternating current for voltage and current DC Direct 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) µA Microampere (exp.–6) Hz Hertz (unit of frequency) kHz Kilohertz (exp.3) MHz Megahertz (exp.6) Ω Ohm (unit of electric resistance) kΩ Kiloohm (exp.3) MΩ Megaohm (exp.6) nF Nanofarad (unit of electric capacity, exp.-9, symbol ) µF Microfarad (exp.-6) Symbol for the diode test Lightning symbol appears in the voltage measurement range 600 V37 Measuring 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 lines for damage such as, for example, cuts, cracks or having been squashed. 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. Measuring is only possible with the battery and fuse compartments closed. If the compartment is open, then the measuring sockets are physically protected from being inserted. You may only connect the two measuring leads to the measuring device that are required for measuring operation. Remove all measuring leads not required from the device for safety reasons. The display on the VC250 and VC270 shows the corresponding connection sequence of the measuring sockets for each measur- ing function. Observe this when connecting the measuring leads to the measuring device. If “OL” (overload) appears on the display, you have exceeded the measuring range. a) Switching on the meter The VC200 series meters are switched on in different ways. Always turn the device off when it is not in use. VC250: Turn the device on by pressing the On/Off switch (3). The switch must click into place. If the switch is pressed in the meter is switched on. To turn off press this button again. VC270 Turn the dial switch (4) to the corresponding measurement function. To switch off turn the dial switch to “OFF”. VC290 Turn the dial switch (4) to the corresponding measurement function. To switch off turn the dial switch to “OFF”. This is present on both sides of the dial range in the VC290. Before you can use the meter, the battery supplied must be inserted or in the case of the VC290 the inbuilt capacitor needs to be charged. Insertion and changing of batteries and the charging of the capacitor is described in the “Cleaning and Maintenance” chapter.38 b) Measuring Voltage “V” Proceed as follows to measure DC voltages „DC“ (V ): - Turn the DMM on and select measuring range “V ”. For lower voltages, up to max. 200/400 mV, select the measuring range “mV p. 4830

- Plug the red measuring lead into the V measuring socket (7) and the black measuring lead into the COM measuring socket (8). - 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 display together with the current measured value. If a minus “-” appears in front of the voltage value when measuring DC, the measured voltage is negative (or the measuring tips have been mixed up). The voltage range “V DC/AC” exhibits an input resistance of >10 MOhm, the “mV DC” mea- suring range for the VC270 and VC290 is >4000 MOhm. - After measuring, remove the measuring leads from the measured object and turn the DMM off. Proceed as follows to measure AC voltages (V ): - Turn the DMM on and select measuring range “V ”. Press “SELECT” (10) on the VC 290 to switch to the AC range. “AC” appears on the display. - Plug the red measuring lead into the V measuring socket (7) and the black measuring lead into the COM measuring socket (8). - 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 measuring object and turn the DMM off. c) Measuring Current “A” 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! The voltage in the measuring circuit may not exceed 600 V. Measurements in the > 5 A range may only be performed for max. 10 seconds and at 15 minute intervals. Always start current measurements at the highest measurement range and switch down to lower ranges if necessary. Before changing the measurement range, always shut off the circuit. All current measuring ranges are provided with fuses and thus protected against overload.39 The µA/mA measuring input for the VC270 has a self-resetting PTC fuse; fuse changes are not required after overloading. If the PTC fuse has tripped (measured value does not change etc.), turn the DMM off (OFF) and wait about five minutes. The self-resetting fuse cools down and then func- tions again. Proceed as follows to measure DC voltages (A ): - Turn the DMM on and select measuring range “A ”. - The table provides an overview of the different measurement functions and the possible measure- ment ranges. Select the measurement range and corresponding measurement sockets. Measurement VC250 VC270 VC290 Measurement function sockets µA <200 µA <4000 µA <4000 µA COM + mAµA mA 200 µA - 199 mA 4000 µA – 399 mA 4000 µA – 399 mA COM + mAµA A 200 mA – 10 A 400 mA – 10 A 400 mA – 10 A COM + 10A - Plug the red measuring lead into the mAµA- or 10A socket. Plug the black measuring lead into the COM socket. - Now connect the two test probes in series with the object to be measured (battery, circuit etc.); the display indicates the polarity of the measured value together with the currently measured value. If a minus “-” appears in front of the measured value when measuring DC, the measured volt- age is negative (or the measuring leads have been mixed up). - After measuring, remove the measuring leads from the measured object and turn the DMM off. Proceed as described above to measure alternating currents (A ): - Turn the DMM on and select measuring range “A ”. Press “SELECT” on the VC270 and VC290 to switch to the AC measurement range. “AC” appears on the display. Pressing this button again, takes you back etc. - After measuring, remove the measuring leads from the measured object and turn the DMM off. Do not measure any currents above 10 A in the 10 A range and no currents above 400 mA in the mA/µA range, otherwise the fuses trigger.40 d) Frequency Measurement “ (only VC270 and VC290) The DMM ca n measure and display the frequency of a signal voltage between 10 Hz and 10 MHz. Proceed as follows to measure frequencies: - Turn the DMM on and select measuring range “Hz”. The display reads “Hz”. - Plug the red measuring lead into the Hz measuring socket (7) and the black measuring lead into the COM measuring socket (8). - Now connect the two measuring probes to the object to be measured (sig- nal generator, switch etc.). - The frequency and corresponding unit are displayed. - After measuring, remove the measuring leads from the measured object and turn the DMM off. e) Measuring Resistance Make sure that all the circuit parts, switches and components and other objects of measurement are disconnected from the voltage and discharged. Proceed as follows to measure resistance: - Turn the DMM on and select measuring range “Ω”. - Plug the red measuring lead into the Ω measuring socket (7) and the black measuring lead into the COM measuring socket (8). - 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).

- When conducting low-Ohm measurements on the VC270 and VC290, press the button “REL” (3) to not let the inherent resistance of the measuring leads influence the following resistance measure- ment. The display shows 0 Ohm The automatic range selection (Autorange) is deactivated. The Autorange function can be reactivated by changing the measurement function (e.g. press the “SELECT” button twice). - Now connect the measuring probes to the object to be measured. As long as the object to be mea- sured is not high-Ohm or interrupted, the measured value will be indicated on the display. Wait until the displayed value has stabilised. With resistances of >1 MOhm, this may take a few seconds. - If “OL” (overload) appears on the display, you have exceeded the measuring range or the measur- ing 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.41 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 “SELECT” on the VC270 and VC290 to switch the measurement function. The diode symbol appears in the display. Pressing this button again takes you to the next measuring function. - Plug the red measuring lead into the Ω measuring socket (7) and the black measuring lead into the COM measuring socket (8). - 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. g) 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 or - Press “SELECT” twice on the VC270 and VC290 to switch the measure- ment function. The symbol for continuity check now appears in the dis- play. Pressing this button again takes you to the first measuring function etc. - Plug the red measuring lead into the Ω measuring socket (7) and the black measuring lead into the COM measuring socket (8). - A continuity value of less than 10 Ohm is identified as continuity; in this case a beep sounds. - If “OL” (overload) or 1 appears on the display, you have exceeded the measuring range or the measuring circuit has been broken. - After measuring, remove the measuring leads from the measured object and turn the DMM off.42 h) Measuring Capacity (only VC270 and VC290) 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, observe the polarity. - Turn the DMM on and select the measuring range - Plug the red measuring lead into the V measuring socket (7) and the black measuring lead into the COM measuring socket (8). - The display shows the unit “nF”. Due to the sensitive measuring input, the display may show a value even with “open” measuring leads. Pressing the “REL” button resets the display to “0”. The Autorange function remains active. - Now 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 measuring range. - After measuring, remove the measuring leads from the measured object and turn the DMM off.

i) Battery Test “ (only VC250)

The battery test is used to quickly check the most common 1.5V batteries and 9V block batteries. For an objective measuring result, the batteries/storage batteries are tested under a small load. The real pole voltage under load is indicated on the display. Measurement can also be carried out on recharge- able batteries. To do so select the measurement range which suits your rechargeable battery best (e.g. measurement range 1.5 V for 1.2 V rechargeable battery) - Turn the DMM on and select measuring range - Plug the red measuring lead into the mA µA measuring socket (5) and the black measuring lead into the COM measuring socket (8). - The display shows the unit “V”. Rechargeable batteries have a lower cell voltage and the mea- sured value is correspondingly lower than for normal batteries. - If “1” appears on the display, you have exceeded the measuring range. - After measuring, remove the measuring leads from the measured object and turn the DMM off.

REL Function (only VC270 and VC290) The REL function allows a reference value measurement to avoid possible line losses which may caused e.g. during resistance measurements. For this purpose, the current indicated value is set to zero. A new reference value is set. Press the “REL” button to activate this measuring function. “ ” appears on the display. The auto- matic measuring range selection is deactivated (except for capacity measurement range). In order to switch off this function, simply change the measurement function. The REL function is not active in the frequency measuring range or in high-Ohm resistance measurement range, during diode tests and continuity testing. HOLD Function (only VC290) 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 false! To switch on the Hold function, press the “H” button (9); an acoustic signal confirms this command and “H” appears on the display. In order to switch off the HOLD function, press the “H” button (9) again or simply change the measure- ment function. Low Imp. 400 kΩ Function (only VC250 and VC270) This function may only be used for voltages of a max. of 250 V and a max. of 3 sec- onds! This measuring function enables the reduction of the measuring impedance from 10 MΩ to 400 kΩ. The reduction of the measuring impedance suppresses possible phantom voltages, this could falsify the measuring result. Press this button during voltage measurement (max. 250 V!) for a max. of 3 seconds. After the button is released, the multimeter has its normal measuring impedance of 10 MΩ. Auto-Power-Off Function (only VC270 and VC290) 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 the “REL” or “SELECT” button.44 The Auto-Power-Off function can be manually deactivated. To do so, turn the measuring device off (OFF). Keep the button “SELECT” pressed and turn the DMM on at the dial switch. This function remains inactive until the measuring device is turned off via the dial switch. Cleaning and Maintenance General Information To ensure the accuracy of the multimeter over an extended period of time, it should be calibrated once a year. Apart from occasional cleaning and fuse replacements, the multimeter requires no servicing. Information on changing the battery and fuse appears below. Regularly check the technical safety of the instrument and measuring lines, 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 lines must be disconnected from the measuring device and all measuring 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 purposes. These could corrode the surface of the measuring instrument. The vapours are also detri- mental to health and are explosive. Sharp-edged tools such as screwdrivers or metal brushes should not be used for cleaning purposes. For cleaning the device or the display and the measuring lines, use a clean, fuzz-free, antistatic slight- ly damp cloth. Allow the product to dry completely before you use it again to conduct measurements. Opening the Measuring Instrument You can only change the fuses or battery if all measurement cables are disconnected from the mea- suring device. The battery and fuse compartment (17) cannot be opened if measuring cables are con- nected. In addition, all of the measuring sockets are physically locked when the compartment is open, in order to inhibit measuring cables being inserted. The locking mechanism is automatically deactivated if the battery and fuse compartment is closed again.45 The housing design only allows access to the battery and fuses when the com- partment is open. The housing no longer needs to be fully opened and taken apart. This increases user safety and the user-friendliness of the device. Proceed as follows to open the compartment: - Disconnect all measuring lines from the meter and switch it off. - Unscrew and remove the battery compartment screw on the back of the device (14). - With the attachment clip folded away, pull the battery and fuse compartment cover (17) downwards and off the meter. - The fuses and the battery compartment are now accessible. - Proceed in the reverse order to close the housing and screw the battery and fuse compartment securely into place. - The meter is ready for use once again. Replacing the fuse The current measuring ranges are secured with high performance fuses. If measuring in this range is no longer possible, you have to change the fuse. Proceed as follows for replacement: - Separate the connected measuring leads from the measuring circuit and the measuring device. Switch the DMM off. - Open the housing as described in the chapter “Opening the Measuring Instrument”. - Replace the defective fuse with a new fuse of the same type and nominal voltage. The fuses have the following values: Fuse F1 F2 VC250 F10A 600V (6.35 x 31.8 mm) FF 200 mA 600V (32 x 6 mm) VC270 F10A 600V (6.35 x 31.8 mm) 3 x F 160 mA/600 V self-resetting, PTC (32 x 6.2 mm) VC290 F10A 600V (6.35 x 31.8 mm) FF 400 mA 600V (6.35 x 31.8 mm) Switching capacity 10 kA - Now, close the cover carefully again. Using mended fuses or bridging the fuse holder is not admissible for safety rea- sons. This can lead to fires or to arc explosions. Never operate the measuring instrument when it is open.46 Inserting and Changing the Battery (only VC250 und VC270) Operation of the measuring device requires a 9V block battery (e.g. 1604A). You need to insert a new, charged battery prior to initial operation or when the battery change symbol or appears on the display. Proceed as follows to insert or change the batteries: - Separate the connected measuring leads from the measuring circuit and the measuring device. Switch the DMM off. - Open the housing as described in the chapter “Opening the Measuring Instrument”. - Replace the flat battery with a new one of the same type. Now place the new battery into the battery compartment, observing the correct polarity (16). Look for the plus and minus symbols in the battery compartment. - Now, close the cover carefully again. Never operate the measurement device 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 battery compartment. Do not leave batteries lying around carelessly. They could be swallowed by chil- dren 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. Batteries must not be recharged or dismantled. There is a risk of explosion. You can order suitable alkaline batteries under the following item no.: Item no. 65 25 09 (please order one). Only use alkaline batteries, as they are powerful and have a long service life. Charging the VC290

e VC290 operates without batteries. Power for the VC290 is provided by an inbuilt high-capacity capacitor (High-Cap). This capacitor can be charged at any 230 V/AC power source (grid source) using a charge function on the dial switch. If the light conditions are conducive, a solar cell (11) also buffers the capacitor independently of the mea- surement function and further lengthens the operating time.47 Proceed as follows to charge at a grid power source (230 V/AC): - Turn the DMM on and select measuring range “CHARGE“. - Plug the red measuring lead into the V measuring socket (7) and the black measuring lead into the COM measuring socket (8). - The display shows the symbol “CHARGE!” and the relative charge volt- age. This ranges from -2.600 V (empty) to 3.999 V. If the high-cap is loaded the display shows “OL”. A charge time of 10 minutes is sufficient for approximately 180 minutes measuring time in the DC V measuring range. - If the high-cap has been fully discharged and nothing appears in the dis- play, press the “RESET” button (3) during charging. The DMM will be reactivated. Disposal a) Product Electronic devices are hazardous waste and do not belong in the household waste. Dispose of the product at the end of its lifetime, according to the applicable legal regulati- ons. Remove batteries/rechargeable batteries that may be inserted and dispose of them sepa- rately. b) Batteries/rechargeable batteries As an end user, you are legally obliged (battery directive) to return all used batteries/rechargeable bat- teries; disposal in the household waste is not permitted. Batteries/rechargeable batteries containing hazardous substances are marked with the adjacent symbol, which indicates that disposal in the household waste is prohibited. Denotations fort he respective heavy metals are: Cd=cadmium, Hg=mercury, Pb=lead (The denotations can be found on the batteries/rechargeable batteries e.g., under the waste bin symbol to the right). You can return used batteries/rechargeable batteries free of charge at the collecting point of your council, in our stores or everywhere, where batteries/rechargeable batteries are sold. You thereby fulfil the legal requirements and contribute to the protection of our environment.48 Troubleshooting In purchasing the DMM, you have acquired a product which has been designed to the state of the art and is operationally reliable. Problems and malfunctions may, however, still arise. For this reason, the following is a description of how you can eliminate possible malfunctions yourself. Please observe the safety instructions! Error Possible cause Remedy The multimeter Is the battery flat or is the high-cap Check the status. Change the battery or doesn’t function (VC290) discharged? charge the device. No measured Is the wrong measurement function Check the display (AC/DC) value change. active (AC/DC)? measurement value change and switch the function if necessary. Did you use the wrong measuring Compare the connection with that shown sockets? in the display. Is the fuse defect? Check the fuses. Is the Hold function activated in the Press the “H” button to deactivate this VC290 (display "H") function. Repairs other than those described should only be carried out by an authorised specialist. Proceed to page 28 where you will find the section with the Full Service Hotline. Technical Data Display . . . . . . . . . . . . . . . . . . . . . . . . . . .4000 Counts (digits), 2000 Counts for VC250 Measuring rate . . . . . . . . . . . . . . . . . . . . .approx. 2-3 measuring operations/second Measuring lead length . . . . . . . . . . . . . . . .approx. 90 cm each Measuring impedance . . . . . . . . . . . . . . . .>10MΩ (V range) Operating voltage . . . . . . . . . . . . . . . . . . .9V block battery (VC250/VC270) High-cap/Solar cell (VC290) Working conditions . . . . . . . . . . . . . . . . . .0 to 30°C (<75%rF), >30 to 40°C (<50%rF) Operating altitude . . . . . . . . . . . . . . . . . . .max. 2,000 m Storage temperature . . . . . . . . . . . . . . . . .-10°C to +50°C Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . .approx. 380 g Dimensions (LxWxH) . . . . . . . . . . . . . . . .185 x 91 x 43 (mm) Over-voltage category . . . . . . . . . . . . . . . .CAT III 600 V, Impurity level 2 Measurement tolerances Statement of accuracy in ± (% of reading + display error in counts (= number of smallest points)). The accuracy is valid for one year at a temperature of +23°C ± 5°C, and at a relative humidity of less than 75 %, non-condensing.49 DC Voltage Range Accuracy Resolution Range Accuracy Resolution VC250 VC270/290 VC270 VC290 200 mV 0.1 mV 400 mV ±(0,8% + 10) ±(0,8% + 10) 0.1 mV 2 V ±(0.5% + 8) 1 mV 4 V 1 mV 20 V 0.01 V 40 V ±(0,8% + 10) ±(0,8% + 10) 0.01 V 200 V 0.1 V 400 V 0.1 V 600 V ±(0,8% + 8) 1 V 600 V ±(1% + 10) ±(1% + 10) 1 V Overload protection 600 V AC Voltage Range Accuracy Resolution Range Accuracy Resolution VC250 VC270/290 VC270 VC290 2 V 0.001 V 4 V 0.001 V 20 V ±(1,0% + 10) 0.01 V 40 V ±(1,3% + 7) ±(1,5% + 8) 0.01 V 200 V 0.1 V 400 V 0.1 V 600 V ±(1,3% + 7) 1 V 600 V ±(1,6% + 7) ±(1,6% + 7) 1 V Frequency range 40 – 400 Hz; effective average at sinusoidal voltage; overload protection 600 V DC Current Range Accuracy Resolution Range Accuracy Resolution VC250 VC270/290 VC270 VC290 200 µA 0.1 µA 400 µA ±(1.3% + 2) ±(1.2% + 10)

1.5 V approx. 15Ω 0.001 V

9 V approx. 1kW 0.01 V Overload protection: self-resetting PTC fuse51 Diode Test Test voltage Resolution VC250 approx. 3.0 V 0.001 V VC270 approx. 1.48 V 0.001 V VC290 approx. 1.48 V 0.001 V Overload protection: 600 V Acoustic continuity tester <10 W continuous tone, overload protection 600 V Do not exceed the maximum permitted input values. Do not contact circuits or parts of circuits if the voltages applied could be higher than 25 V ACrms or 35 V DC. Risk of fatal injury!52