Operating Instructions METRAport3A Analog Multimeter 3-349-303-15 5/11.
1 11 2 7 4 5 3 3 6 10 7 4 9 8 5 6 1 2 3 4 5 6 7 8 9 10 11 2 Scale Cover of battery compartment Connection socket „10 A“ for the highest current range Connection socket for the measuring range A| Connection socket for the measuring range V (high potential) Connection socket for all measuring ranges Eye for fastening of the carrying strap OFF|ON: on/off switch (off when the instrument is closed) Potentiometer full scale deflection setting for resistance measurement Function switch and range swit
Contents Page Safety Features and Precautions ............................................................4 Application ..............................................................................................6 Description .............................................................................................6 Operation ................................................................................................7 Controls ........................................................................
1 Safety Features and Precautions You have selected an instrument which provides you with a high level of safety. This instrument fulfills the requirements of the applicable European and national EC guidelines. We confirm this with the CE marking. The relevant declaration of conformity can be obtained from GMC-I Messtechnik GmbH. The analog/digital multimeter has been manufactured and tested in accordance with safety regulations IEC 61010–1:2001/ DIN EN 61010–1:2001/VDE 0411–1:2002.
• Make certain that the measurement cables are in flawless condition, e.g. no damage to insulation, no interruptions in cables or plugs etc. For the application of measuring cables see chapter 8.2. No measurements may be performed with this instrument in electrical circuits with corona discharge (high voltage). Special care is required when measurements are made in HF electrical circuits. Dangerous pulsating voltages may be present. Measurements under moist ambient conditions are not permitted.
Repairs, Parts Replacement and Balancing When the instrument is opened, voltage conducting parts may be exposed. The instrument must be disconnected from the measuring circuit before repair, replacement of parts or balancing. If repair or balancing of a live, open instrument is required, this may only be carried out by trained personnel who are familiar with the dangers involved.
Several well-tuned protection means protect the instrument against damage through improper handling and overload within the specified limit values for overload: • Overdimensioned precision resistors • Melting fuse in conjunction with protective power diodes • Overvoltage arrester The instrument operates independent of the mains on a commercially available 9 V flat cell battery. Thanks to the low power consumption of the electronic components, a long battery life is assured.
changing the current measuring ranges. When making current and voltage measurements, take care that the range switch is first set to the highest measuring range. Then work down to lower measuring ranges until optimum display is obtained. ! Attention! When the measuring voltage, e.g. 250 V , is applied, do not switch to the resistance measuring ranges. From the range x 100 on there is danger of damaging the contacts of the range switch.
Special measuring leads the connection plugs of which are protected against accidental contact (lead set KS17-2) as well as all leads with banana plugs (4 mm diameter) can be plugged onto the sockets. Melting fuses for measuring circuit (see also chapter 5). Potentiometer for full scale deflection setting when measuring resistance 4.2 Starting the Instrument Installing the battery Ð To install or replace the battery, the battery compartment must be opened.
Checking the battery voltage If the pointer is within the zone marked with the battery symbol „ “ after the instrument has been turned on then the battery voltage is sufficient that is, it is assured that the error limits according to the data given in chapter 5 „Technical Data“ are maintained. 4.
4.4 ! Current Measurement Attention! The multimeter should be connected into the line having the lowest voltage to earth. For safety reasons, the voltage to earth must not exceed 600 V CAT II or 300 V CAT III! The measuring circuit must be set up mechanically solid and protected against accidental opening. The conductor cross sections and the connection points must be designed in such a way that there will be no unpermissible warm-up. The current measuring ranges 10 μA ... 1 A are protected by a 1.
4.4.1 DC and AC Currents up to 1 A (Direct Connection) Ð Disconnect the power supply to the measuring circuit and/or power consumer (RV), and discharge all capacitors, if available. Ð Set the range switch to position RV 1/10 A or 1/10 A~. Ð Interrupt the measuring circuit and safely connect the –/~ +/~ measuring leads (without transient resistor!) in series with the power consumer Rv . With DC current note the polarity! Ð Set switch to position „ON“. Ð Reconnect the power supply to the measuring circuit.
4.4.2 DC and AC Currents up to 10 A (Direct Connection) Ð Disconnect the power supply to the measuring circuit and/or power consumer (RV), and discharge all capacitors, if available. Ð Set the range switch RV to position 1/10 A or 1/10 A~. Ð Interrupt the mea– (+) / ~ + (–) / ~ suring circuit and safely connect the measuring leads (without transient resistor!) in series with the power consumer Rv. With DC current note the polarity! Ð Set switch to position „ON“.
4.4.4 AC Currents with (Clip-on) Current Transformers I(A) M V~ ! Attention! Prior to closing the primary circuit, verify that the secondary circult is closed. If current transformers are operated in open state on the secondary side, e.g. due to defective or not connected leads, due to a blown fuse because of prior overload, or due to a wrong position of the range switch (not on the current range), dangerously high voltages can appear at the connection terminals.
Ð Select the measuring range of the multimeter as a function of the measuring range and the transformation ratio of the clip-on transformer. Ð Connect the measurement cables as shown. Ð Set switch to position „ON“. Ð Scan the electrical circuit with the clip-on transformer. Ð Read the measured value by making allowances for the transformation ratio of the transformer. Ð Disconnect the clip-on transformer from the electrical circuit before separating the measurement cables from the instrument! 4.4.
4.5 Measurement of Composite Voltages and Composite Currents The multimeter allows for separate measurements of DC and AC components of composite voltages and composite currents. ! Attention! The sum of the DC and AC components of the measured variable shall not exceed the permissible limit values for overload according to chapter 5, and/or the response values of the protective means! 4.5.1 Composite Voltages Perform the measurement in accordance with chapter 4.3.
! Voltage Drop Resistance Measurement For resistance measurement, the resistance Rx to be measured is switched in parallel to the internal resistance. That is why with open input terminals (Rx = ) the scale value (full scale deflection) is indicated. The polarity of the voltage to be measured corresponds to the markings on the connection sockets „A|“ and „“. The resistance measuring ranges are protected by a superquick-action melting fuse FF 1.6A/600V AC in conjunction with power diodes.
Ð With adjustment potentiometer, adjust to full scale deflection . Ð Connect the measurement cables as shown. Ð Read the resistance value on the scale giving consideration to the multiplication factor. ! Attention! Only electrically dead items may be measured. External voltages would falsify the measured result. After the range switch has been switched from one resistance measuring range to another, always check the full scale deflection and correct with potentiometer, if required. 4.
Ð Read the resistance value on the -scale and the voltage on the V, A scale with the 100 part graduation.
5 Technical Data Level 2) Voltage 1) 1) Const. Measuring Span Input Resistance Ri –18 dB Overload Protection up to 3) 100 mV –20 dB –40 ... 300 mV –10 dB –30 ... – 8 dB 600 V 600 V 1 V 0 dB –20 ... + 2 dB 600 V 3 V +10 dB –10 ... + 12 dB 10 V +20 dB 0 ... + 22 dB 600 V 30 V +30 dB +10 ... + 32 dB 600 V 100 V +40 dB +20 ... + 42 dB 600 V 300 V +50 dB +30 ... + 52 dB 600 V 600 V +60 dB +40 ...
Resistance Range x ShortCircuit Current IK Overload Protection up to 2 k 45,6 100 mV 2,2 mA 456,0 100 mV 0,22 mA 600 V 3) 600 V 3) x 100 100 ... 200 k 4,56 k 100 mV 22 μA 600 V 3) 1 k x 10 4) OpenCircuit Voltage U0 10 ... 20 k 1 1 ... Mid-Scale Value (Ri) x 10 k x 3) Read-out Range 2 M 45,6 k 1 V 22 μA 600 V 3) 10 k ... 20 M 456,0 k 1 V 2,2 μA 600 V 3) 1 k ... Protected by G type melting fuse link FF 1.
Influencing variables and rated operating ranges Temperature +5 ... +23 ... +35 C Limit temperatures for accuracy +5 ... +35 C for operation 0 ... +40 C for storage –25 ... +65 C (without battery) Position additional influence effect max. 1% of scale length when the scale is inclined to the horizontal between 0 and 120 Frequency additional influence effect max. 10% of full scale value in the ranges 100 mV; 3 V ... 600 V: 10 μA ... 10 A: 300 mV; 1 V: 15 Hz ... 1 kHz 15 Hz ... 1 kHz 15 Hz ...
Fuse Range up to 1 A and FF 1.6A/600V, 6 mm x 32 mm protects the 10 μA ... 1 A and x1 ... k x10 ranges in conjunction with the power diodes Switching capacity: 50 kA with 600 V~ (one half wave on ohmic load) overload limit of the melting fuse in conjunction with the power diodes: max.
6 Maintenance ! 6.1 Attention! Disconnect the instrument completely from the measuring circuit before opening the battery compartment to replace the battery! Battery The state of the battery should be checked from time to time. A discharged or deteriorating battery shall not be left in the battery compartment. When a check of the battery voltage according to chapter 4.2 shows that the pointer is beyond the zone for the battery check then the battery needs to be replaced as described in chapter 4.2.
Melting Fuse for the mA Range (up to 1 A) The built-in FF 1.6A/600V AC melting fuse for the measuring circuit up to 1 A/can be checked for continuity on the resistance measuring ranges, preferrably on the x 1 range. With the measuring sockets „A|“ and „“ shorted, the resistance of the fuse must be indicated to be approximately 0.5 . If the fuse is defective, is indicated.
6.3 Housing No special maintenance is required for the housing. Keep outside surfaces clean. Use a slightly dampened cloth for cleaning. Avoid the use of cleansers, abrasives or solvents. Device Return and Environmentally Compatible Disposal The instrument is a category 9 product (monitoring and control instrument) in accordance with ElektroG (German Electrical and Electronic Device Law). This device is not subject to the RoHS directive.
During recalibration* in an accredited calibration laboratory (DIN EN ISO/IEC 17025) the deviations of your instrument in relation to traceable standards are measured and documented. The deviations determined in the process are used for correction of the readings during subsequent application. We are pleased to perform DKD or factory calibrations for you in our calibration laboratory. Please visit our website at www.gossenmetrawatt.
8.2 Technical Data for Measurement Cables (scope of delivery: KS17-2 safety cable set) Electrical Safety Maximum Rated Voltage 600 V 1000 V 1000 V Measuring Category CAT IV CAT III CAT II Maximum Rated Current 1A 1A 16 A with safety cap applied — without safety cap applied — — Ambient Conditions (EN 61010-031) Temperature –20 C ...
9 Repair and Replacement Parts Service Calibration Center and Rental Instrument Service When you need service, please contact: GMC-I Service GmbH Service-Center Thomas-Mann-Str. 20 90471 Nürnberg • Germany Phone +49 911 817718-0 Fax +49 911 817718-253 E-Mail service@gossenmetrawatt.com www.gmci-service.com This address is only valid in Germany. Please contact our representatives or subsidiaries for service in other countries.
Edited in Germany • Subject to change without notice • A pdf version can be found on the internet GMC-I Messtechnik GmbH Südwestpark 15 90449 Nürnberg • Germany Phone +49 911 8602-111 Fax +49 911 8602-777 E-Mail info@gossenmetrawatt.com www.gossenmetrawatt.
