Gossen MetraWatt METRAport 3A Operating Instructions Manual Download Page 19 | Manualshive

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GMC-I Messtechnik GmbH

19

➭

Set the range switch to position



x 1 ... k



x 10.

➭

Set switch to position „ON“.

➭

With adjustment potentiometer, adjust to full scale deflection



.

➭

Connect the measurement cables as shown.

➭

Read the resistance value on the



scale giving consideration to the

multiplication factor.

Attention!

!

Only electrically dead items may be measured. External volt-
ages would falsify the measured result.

After the range switch has been switched from one resistance measur-
ing range to another, always check the full scale deflection



and

correct with potentiometer, if required.

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Summary of Contents for METRAport 3A

Page 1: ...METRAport 3A Analog Multimeter 3 349 303 15 3 6 09 Operating Instructions ...

Page 2: ...ection socket for the measuring range V high potential 6 Connection socket for all measuring ranges 7 Eye for fastening of the carrying strap 8 OFF ON on off switch off when the instrument is closed 9 Potentiometer full scale deflection setting for resistance measurement 10 Function switch and range switch 11 Setscrew for mechanical zero 3 4 5 6 1 2 8 10 7 3 4 5 6 7 9 11 ...

Page 3: ...10 A Direct Connection 14 4 4 3 DC and AC Currents above 10 A with External Shunt 14 4 4 4 AC Currents with Clip on Current Transformers 15 4 4 5 DC and AC Currents with Clip on Current Sensors Current Transformers with Voltage Output 16 4 5 Measurement of Composite Voltages and Composite Currents 17 4 5 1 Composite Voltages 17 4 5 2 Composite Currents 17 4 6 Resistance Measurement 18 4 7 Test of ...

Page 4: ... and that you follow all instructions contained therein Observe the following safety precautions The instrument may only be operated by persons who are capable of recognizing contact hazards and implementing appropriate safety precautions Contact hazards exist anywhere where volt ages of greater than 33 V RMS may occur Avoid working alone when taking measurements which involve contact hazards Be c...

Page 5: ...suring ranges are not over loaded beyond their allowable capacities Limit values can be found in the Measuring Ranges table in chapter 5 Technical Data Meaning of symbols on the instrument Warning concerning a point of danger Attention observe documentation Earth Continuous doubled or reinforced insulation CAT II III Measurement category II 600 V III 300 V device Indicates CE conformity fuse This ...

Page 6: ...ns e g humidity dust excessive temperature 2 Application The multimeter is an analog multimeter with an electronic amplifier It offers a great number of applications in the field of the electrotechnical practice e g in research and development manufacture operation test room and service as well as in the field of training and further edu cation 3 Description The multimeter features 46 measuring ra...

Page 7: ...hich are protected against accidental contact lead set KS 17 and all measuring leads with conventional banana plugs 4 mm diameter can be used 4 Operation 4 1 Controls ON OFF switch The toggle switch is used to turn the instrument on and off This switch should be switched to the OFF position when the instrument is not operated for extended periods of time in order to avoid unnecessary load on the b...

Page 8: ...s are free for measur ing Setscrew for setting of the mechanical zero Analog indication Indication of the measured value is effected by a moving coil core magnet movement withspring loaded jewel bearings on a mirror backed scale of a maximum length of 101 mm Connection sockets The instrument has four connection sockets which are protected against accidental contact They have the following function...

Page 9: ...from the measuring circuit prior to removing the cover of the battery compartment Close the instrument Put a coin or a similar object into the slot between the case and the cover of the battery compartment and press down Open the instrument completely and remove the cover of the bat tery compartment Install a 9 V flat cell battery into the battery compartment Attention Only use a leak proof 9 V fl...

Page 10: ...f possible take the connection socket marked immediately to earth or to the point having the lowest potential to earth when making any voltage measurements 4 3 1 DC and AC Voltages up to 600 V Direct Connection Set the range switch to posi tion 600 V or 600 V Connect the measurement cables as shown With DC voltage note the po larity The jack must be grounded For safety rea sons leads with connecti...

Page 11: ...anges 3 10 and 30 µA Attention For safety reasons observe the following when measuring voltages above 600 V to earth Put the multimeter onto an insulated surface and connect the measuring leads in such a way that the protective lead of the probe and the socket are directly taken to the protective conductor earth potential The bonding terminal must be grounded for this purpose First set the range s...

Page 12: ...on 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 6 A superquick action melting fuse FF 1 6A 600V AC in conjunction with power diodes The maximum breaking capacity of the protective means is 200 A one half wave with a nominal voltage of 600 V and ohmic load Attention Upon cut out of the protective means ...

Page 13: ...A or 1 10 A 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 Set switch to position ON Reconnect the power supply to the measuring circuit Work down to lower current measuring ranges until optimum indica tion is obtained Switching over does not interrupt the measuring circuit Re...

Page 14: ...ing leads without transient resistor in series with the power consumer Rv With DC current note the polarity Set switch to position ON Reconnect the power supply to the measuring circuit Read the measured value on the V A scale 0 100 4 4 3 DC and AC Currents above 10 A with External Shunt Measurements of cur rents above 10 A are possible with shunts RN e g 100 A 100 mV Set the range switch to posit...

Page 15: ...inals Therefore first check that the current circult of the measuring instrument and the secondary winding of the transformer which is connected to the instrument form an uninterrupted measuring circuit This can be done for all mea suring ranges by means of a resistance measurement as described in chapter 4 6 Clip on current transformers allow for measurements of AC currents without the need to in...

Page 16: ...ement cables from the instrument 4 4 5 DC and AC Currents with Clip on Current Sensors Current Transformers with Voltage Output Set the range switch to position V or V Select the measuring range of the multimeter as a function of the measuring range and the transformation ratio of the clip on sensor Connect the measurement cables as shown Set switch to position ON Scan the electrical circuit with ...

Page 17: ...DC voltage measurement with superimposed AC voltage The AC voltage component may be 5 times the full scale value on 50 Hz and 50 times the full scale value from 500 Hz on The additional error is then smaller than 2 5 of the full scale value AC voltage measurement with superimposed DC voltage The sum of the AC voltage and the superimposed DC voltage shall not exceed the permissible limit values for...

Page 18: ...t out of the protective means Check the measuring electric circuit and eliminate the cause of overload prior to putting the instrument back to serviceable condition On the ranges x 1 x 10 and x 100 the open circuit voltage at the sockets is approximately 100 mV The voltage across the device under test can be read on the 0 100 graduation whereby 100 scale parts correspond to 100 mV On the ranges k ...

Page 19: ...cables as shown Read the resistance value on the scale giving consideration to the multiplication factor Attention Only electrically dead items may be measured External volt ages would falsify the measured result After the range switch has been switched from one resistance measur ing range to another always check the full scale deflection and correct with potentiometer if required ...

Page 20: ...n of the measuring voltage and the measuring current it fol lows however that semi conductors with relatively high reverse and or residual current such as power diodes and power transistors for instance and also rectifiers with several series connected elements cannot be tested as due to the small measuring current the difference between the readings in forward and or reverse direction are not suf...

Page 21: ...se direction the multimeter indicates the voltage on the diode path on the k x 10 range 1 V for full scale value The reverse current flowing thereby is the difference between the full scale value graduation 100 and the indication One graduation corresponds to 10 mV and or 22 nA A diode and or a transistor is interrupted when or the same value close to is indicated on the scale in both directions i...

Page 22: ... grant at least 2 minutes Voltage 1 Level 2 Input Resistance Ri Overload Protection up to 3 Const Measuring Span 100 mV 20 dB 40 18 dB 10 M 50 pF 600 V 300 mV 10 dB 30 8 dB 600 V 1 V 0 dB 20 2 dB 600 V 3 V 10 dB 10 12 dB 600 V 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 62 dB 600 V Range Current at Full Scale Value Ri 100 ...

Page 23: ...ent temperature 23 C 2 K Relative humidity 40 60 Position of use Device and scale horizontal 1 Frequency of measured variable 45 65 Hz Waveshape of measured variable sinusoidal Battery voltage 7 5 V 0 1 V for other influencing variables per IEC 60051 EN 60051 The multimeter is calibrated in rms values It operates with full wave rectification which valuates the arithmetic mean value Resistance Rang...

Page 24: ...ase of resistance mea surements Series mode interference voltage attenuation on V 60 dB with AC 50 Hz on V 120 dB with DC Common mode voltage attenuation 120 dB with DC and 50 Hz AC Composite voltages and composite currents see chapter 4 5 Other influencing variables per IEC 60051 EN 60051 Power Supply Battery nominal voltage 9 V 9 V flat cell battery per IEC 6LR61 6F22 alkaline manganese zinc car...

Page 25: ...00V AC 6 mm x 32 mm Switching capacity 50 kA at 600 V Elektrical Safety Protection class II per IEC EN 61010 1 2001 VDE 0411 1 2002 Measuring category II III Operating voltage 600 V 300 V Pollution degree 2 Test voltage 3 5 kV per IEC EN 61010 1 2001 VDE 0411 1 2002 Electromagnetic Compatibility EMC Interference emission EN 61326 1 2006 Klasse B Interference immunity EN 61326 1 2006 EN 61326 2 1 2...

Page 26: ...ll an alka line manganese cell or a NiCd storage battery can be used as well A NiCd storage battery is particularly recommended for ambient temperatures below 0 C 6 2 Melting Fuse The instrument is equipped with two fuses Attention Disconnect the instrument completely from the measuring circuit before opening the bottom part of the housing to replace the fuse Upon tripping of the fuse eliminate th...

Page 27: ...terminal Replace the fuse as follows Disconnect the instrument from the measuring circuit Open the bottom part with the housing in closed condition if possi ble To this end remove the rubber bases and pull out the srews Remove the defective fuse and replace it with a new one Close the housing again by pressing it shut at the bottom first After retightening the srews fix the rubber bases again with...

Page 28: ...leansers abrasives or solvents 7 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 This address is only valid in Germany Please contact our representa tives or subsidiaries...

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