Velleman DVM645BI, User Manual

Page 1: ...DVM645BI BENCH MULTIMETER TAFELMULTIMETER MULTIMETRE DE TABLE BANCO MULTÍMETRO TISCHMULTIMETER User Manual Gebruikershandleiding Manuel d utilisation Gebrauchsanleitung ...

Page 2: ...you should have the following items 1 Bench multimeter 2 Test lead set one black one red 3 Carrying strap 4 Power lead 5 Instruction manual If any of the above items are missing or are received in a damaged condition please contact the distributor from whom you purchased the unit Safety Precautions Injury or death can occur even with low voltage and low current It is extremely important that you r...

Page 3: ...in the presence of inflammable gases or fumes vapour or dust 8 Measuring voltages that exceed the limits of the multimeter may damage the meter and expose the operator to a shock hazard Always respect the meter voltage limits as stated on the front of the meter 9 Never apply more than 500V DC between the COM connector and earth 10 When testing for the presence of voltage or current make sure the v...

Page 4: ...Symbols Attention Refer to the operating instructions Dangerous voltage may be present at terminals Ground Earth Terminal AC Alternating Current DC Direct Current Audible Continuity Equipment protected throughout by Double Insulation Protection Class II ...

Page 5: ...DVM645BI GB 4 Instrument Layout Figure 1 1 Bench Multimeter Front Figure 1 2 Bench Multimeter Back ...

Page 6: ...surements AC or DC up to 10A The red test lead is connected to this 5 Function Range Selector Rotary Switch This rotary switch selects the function and selects the desired range 6 Function Range Selector Buttons This button selects the function and selects the desired range 7 The LCD Display The LCD display indicates the measured value of a signal the function mode and indicators 8 The Battery Cov...

Page 7: ...d AC milliamps range each press of the button switches alternately between DC milliamps or AC milliamps 3 Data Hold HOLD Button Press the button to toggle in and out of the Data Hold mode except if the multimeter is already in the Min Max Recording Hold mode When in the Data Hold mode the indicator is displayed and the last reading is held on the display the beeper emits a tone Pressing the button...

Page 8: ... reading is stored as a reference value and the display is then set to zero In the Relative Display mode the value shown on the LCD is always the difference between the stored reference value and the current reading If the new reading is the same as the reference value the display will indicate zero The bar graph displays absolute value not relative value And the over range also occurs according t...

Page 9: ...Recall Hold mode While storing data in the memory display the MEM indicator flashes The Data Recall Hold mode is exited by pressing the button or the button Buzzer Output A 2kHz buzzer sounds in the following cases 1 When the key is operated 2 When the over range occurs except for resistance Ω Ω Ω Ω frequency Hz continuity and diode measurements 3 When the continuity measurement results in less th...

Page 10: ...ng the power lead to the mains and switching on Before doing any measurements always examine the multimeter and accessories for any damage contamination excessive dirt grease etc and defects Examine the test leads for cracked or frayed insulation and make sure the lead plugs fit snugly into the multimeter sockets If there are any abnormalities do not attempt to do any measurements ...

Page 11: ...Ω Ω Ω Ω Hz input terminals respectively 2 Select the desired DC voltage range or set to auto range 3 When the magnitude of the voltage to be measured is unknown always start with the highest range 4 Connect the test leads in parallel with the circuit to be measured Be careful not to touch any live conductors with your hands Note the reading 5 For DC voltage readings the red lead should be connecte...

Page 12: ...n e is not available in Volts AC all other buttons can be used 1 Insert the black and red test leads into the COM and VΩ Ω Ω Ω Hz input terminals respectively 2 Select the desired AC voltage range or set to auto range 3 When the magnitude of the voltage to be measured is unknown always start with the highest range 4 Connect the test leads in parallel with the circuit to be measured Be careful not ...

Page 13: ... used Each press of the button switches alternately between DC and AC Amps 1 Insert the black and red test leads into the COM and A input terminals respectively 2 Turn off or disconnect the circuit to be measured from all power sources connect the multimeter in series with the conductor where the current is to be measured 3 Switch on the power to the circuit under test Note the reading 4 After com...

Page 14: ...ately between DC or AC Milliamps 1 Insert the black and red test leads into the COM and mA input terminals respectively 2 Select the desired DC current range or AC current range 3 Turn off or disconnect the circuit to be measured from all power sources connect the multimeter in series with the conductor where the current is to be measured 4 Switch on the power to the circuit under test Note the re...

Page 15: ...omatically range up or down to display the best resolution Manual range is not available 3 Ensure that the amplitude level of the signal to be measured is not greater than the input voltage limit 250V DC AC rms The signal amplitude must also be greater than the sensitivity level 4 Attach the probe tips to the points across which the frequency is to be measured and read the result directly from the...

Page 16: ...accurate reading or select auto range 4 Connect the crocodile clips to the capacitor leads or insert the capacitor leads into the multimeter measuring socket Always observe the correct polarity when measuring electrolytic capacitors 5 Read the capacitance value directly from the display The accuracy of the capacitance measurement can be improved by first pressing the button Relative mode in order ...

Page 17: ...l other buttons can be used 1 Select the position by turning the rotary switch 2 Insert the black and red test leads into the COM and VΩ Ω Ω Ω Hz input terminals respectively 3 The red lead should be connected to the anode and the black lead to the cathode of the diode 4 The typical voltage drop should be about 0 6V for a silicon diode or 0 3V for a germanium diode 5 If the diode is reverse biased...

Page 18: ...on 2 Insert the black and red test leads into the COM and VΩ Ω Ω Ω Hz input terminals respectively 3 Select the desired ohms Ω range or set to auto range Connect the black and red test probes to the circuit or device under test First make sure that the circuit or device is dead 4 Turn off any power to the resistor to be measured Discharge any capacitors Any voltage present during a resistance meas...

Page 19: ...terminals The Continuity measurement is as follows 1 Select the continuity measurement by pressing the button 2 Insert the black and red test leads into the COM and VΩ Ω Ω Ω Hz input terminals respectively 3 Connect the black and red test probes to the circuit or device under test First make sure that the circuit or device is dead 4 An audible tone will sound when the resistance is less than appro...

Page 20: ...citance 1 time per second Over range indications MSD Most Significant Digit blinks Low Battery indication The indicator is displayed when the battery voltage drops below the reliable operating level Temperature coefficient 0 15 x specified accuracy per C 18 C to 28 C Temperature Operating 5 C to 35 C Storage 10 C to 60 C Relative humidity 20 to 75 RH 5 C to 35 C Back light Safety Power requirement...

Page 21: ...led Range resolution Accuracy reading digits 4V 1mV 40V 10mV 400V 100mV 750V 1V 0 8 rdg 5d 50 to 60Hz 1 2 rdg 5d 45 to 1kHz Input impedance 10MΩ 100pF Overload Protection 1000V DC or 750V AC RMS AC coupled true RMS DC Current Range resolution Accuracy reading digits 4mA 1µA 0 8 rdg 5d 40mA 10µA 0 8 rdg 5d 400mA 100µA 0 8 rdg 5d 10A 20A for 30 seconds 10mA 1 5 rdg 10d Input protection 1A 250V fuse ...

Page 22: ...tage 600mV max for mA input 900mV max for A input AC coupled true RMS Resistance Range resolution Accuracy reading digits 400Ω 0 1Ω 0 5 rdg 5d 4kΩ 1Ω 0 5 rdg 3d 40kΩ 10Ω 0 5 rdg 3d 400kΩ 100Ω 0 5 rdg 3d 4MΩ 1kΩ 1 rdg 5d 40MΩ 10kΩ 1 5 rdg 10d Open circuit Voltage 0 45V Input protection 250V RMS Continuity Test Continuity threshold approx 40Ω Continuity threshold 2kHz buzzer tone Input protection 25...

Page 23: ...de 4µF 1nF 0 5 rdg 5d 40µF 10nF 2 rdg 5d at 20µF 5 rdg 5d at 20µF Input protection 250V RMS Frequency Counter Ranges 100Hz 1kHz 10kHz 100kHz 1MHz Resolution 0 01Hz in the 100Hz range Accuracy 0 1 4d Sensitivity 100mV rms for 1Hz to 20kHz 500mV rms for 20kHz to 1MHz Input protection 250V RMS Adaptive Range Display 10 units per 1mV DC Accuracy 0 3 5d Input protection 250V RMS ...

Page 24: ... battery must be replaced to maintain proper operation Use the following procedure to replace the battery 1 Disconnect the test leads from any live source turn the rotary switch to off and remove the test leads from the input terminals 2 Remove the screws on the battery cover and open it 3 Remove the dead battery and replace with a new equivalent 9V battery 4 Two types of battery are used in the b...

Page 25: ...he blown fuse with one of the same rating 6 The A input terminal is protected by a F 15A 250V fast blow ceramic fuse Ø 6 x 30mm The mA input terminal is protected by a F 1A 250V fast blow ceramic fuse Ø 5 x 20mm 7 Fuses rarely need replacement and almost always blow as a result of operator error 8 Never use the bench multimeter unless the fuse cover is in place and fully fastened Power Fuse Replac...

Page 26: ...r notes 1 Do not use abrasives or solvents on the bench multimeter use a damp cloth with mild detergent only 2 If any faults or abnormalities are observed the bench instrument should not be used and needs to be inspected ...