Dual Display Digital Multimeter
Contents
1. of over range indication DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 6 TRUE RMS AC OR AC DC CURRENT Accuracy Between 2 of range and full range RANGE 20Hz 45Hz 45Hz 2kHz 2kHz 10kHz 10kHz 20kHz 1 15 2 15 1 15 0 5 15 Protection Fuse protection 500 uw A 5mA 50mA 500mA 2A and 20A ranges 20A range input for 15 seconds max Crest Factor Range 3 0 at full scale The burden voltage is the same as the DC current When the input exceeds the full scale of the selected range the display will appear OL of over range indication 7 FREQUENCY MEASUREMENT AT ACA RANGE RANGE FREQUENCY INPUT LEVEL SINE WAVE ACCURACY 500 u A 10Hz 20kHz 90 uA 10Hz 20kHz gt 0 9mA 10Hz 20kHz gt 9mA 0 05 1 500mA 10Hz 20kHz 90mA 10Hz 2kHz 10Hz 2kHz AC DC measurement does not support AC Hz function DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 8 RESISTANCE RANGE RESOLUTION ACCURACY 500 0 01Q 0 1 4 50K 0 142 500K 1000 E OMA 03 2 Open circuit Voltage 3 2 volts maximum on 500 5kQ 1 3 volts maximum on all other ranges Protection 450V dc or peak ac continuous 9 CAPACITANCE ACCURACY InF 2 10 lt InF amp 0 5nF 2 20 10nF 2 10 lt lOnF amp 5nF 2 30 5n range tends to be interfered by the test lead s impedance and position For the accuracy please measure the range2. EMC Electrical equipment for measurement control and laboratory use EMC requirements 2004 108 EC Harmonized Standard EN 61326 1 2006 EN 61326 2 1 2006 Conducted amp Radiated Emission CISPR11 2003 A 1 2004 A2 2006 Class A Electrical Fast Transients IEC 61000 4 4 2004 Corr 1 2006 Com2 2007 Current Harmonics EN 61000 3 2 2006 Surge Immunity TEC 61000 4 5 2005 Voltage Fluctuations EN 61000 3 3 1995 A1 2001 A2 2005 Conducted Susceptibility TEC 61000 4 6 2003 A 1 2004 A2 2006 Electrostatic Discharge IEC 61000 4 2 2001 Power Frequency Magnetic Field TEC 61000 4 8 1993 A1 2000 Radiated Immunity IEC 61000 4 3 2006 A1 2007 Voltage Dips Interrupts IEC 61000 4 11 2004 Safety Low Voltage Equipment Directive 2006 95 EC Safety Requirements TEC EN 61010 1 2001 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL TABLE OF CONTENTS PAGE 1 SAFETY SUMMARY Pec rccccccccccccccccccccccccccccccecccecccccceeeccecces 2 INTRODUCTION Pec crcccccccccccccccccccccccccccccccccccccccecececseececces 3 SPECIFICATION Perec cccccccccccccccccccccccccccececccecceeeeeeccccccceeeee 4 OPERATION INSTRUCTION cecccecsesecccecseceveceseves 5 MEASUREMENT TUTORIAL ccscececscscsccsesesssceees 6 MEASUREMENT TECHNIQUEG ccccceccscececescscececeees 7 MAINTENANCE Pec ccccccccccccccccccc cc ccreccccccceresecceee eee
3. 100kHz frequency response The function is easy to detect DC and compare with the current measured value The secondary display AC components of signal simultaneously mall esbQw Tir when athe measured Value as morte Shane If want to leave the RIPPLE mode just switch to other main maximum value will show Lo when the measured value is less fncton than minimum value and will show Pass in other status The functions of DCV DCmV ACV ACmV AC DC DCA DC20A ACA AC20A OHM and Capacitance have their own maximum and minimum value setting separately according to the procedure as follows 19 20 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 6 MEASUREMENT TECHNIQUES 6 1 dBm measurement technique dBm is defined as above or below a ImW reference A voltage measurement is converted to dBm using the following formula dBm 10 log jo 1000 voltage value reference impedance The reference impedance can be set For example the reference impedance of 600Q 0 7746V will be convert to 0 dBm 6 2 True rms measurement The true rms root mean square value of a waveform is equivalent to dc value that causes the same amount of heat to be dissipated in a resistor Since average responding meters have been in use for so long you may have accumulated test or reference data based on them Figure 6 1 illustrates the relationship between ac and dc components for common waveforms and compares readi
4. Range 3 0 at full scale AC DC all ranges percentage of reading 50 counts When the input exceeds the full scale of the selected range the display will appear __OL of over range indication 3 ACV OF RIPPLE FUNCTION RANGE 20Hz 50Hz 2kHz 10kHz 20kHz 50kHz 50Hz 2kHz 10kHz 20kHz 50kHz 100kHz Input Impedance 10MQ 10MQ in parallel with lt 100pF Maximum Input 450V dc or peak ac continuous Crest Factor Range 3 0 at full scale DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL When the input exceeds the full scale of the selected range the display will appear _OL of over range indication 4 FREQUENCY MEASUREMENT AT ACV RANGE RANGE FREQUENCY INPUT LEVEL SINE WAVE ACCURACY ENN von e Eo 50kHz 150kHz 200mV Auto range 0 4V 10Hz 200kHz Manaul range 1 2V 0 05 1 TOT 200K SOV 200 20K AC DC measurement does not support AC Hz function Maximum Input 450V peak ac continuous on 500mV range 500V peak ac continuous on the other range 5 DC Current RANGE RESOLUTION ACCURACY BURDEN VOLTAGE 500 uA 0 01 uA O 1uA 0 7Vmax 0 05 3 ovina 8Vmax 500mA 104A TOMA 0 2 5 Fuse protection for 500 u A 5mA 50mA 500mA 2A and 20A ranges 20A range input for 15 seconds max Protection When the input exceeds the full scale of the selected range the display will appear OL
5. eeeeeeeeceee DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 1 SAFETY SUMMARY Measuring Circuit Measuring circuits are subjected to working voltage and transient stresses from the circuit to which they are connected during measurement or test The circuits are divided into the following measurement categories Measurement category I is for measurements performed on circuits not directly connected to MAINS Measurement category II is for measurements performed on circuits directly connected to the low voltage installation Measurement category III is for measurements performed in the building installation Measurement category IV is for measurements performed at the source of the low voltage installation Please refer to the installation category indicated on the font panel to select adequate measurement category The equipment marked with measurement category I shall not be used for measurements within measurement II III and IV Safety terms and symbols Please take a moment to review these safety terms and symbols which may appear in this manual or on Equipment to prevent damage to the instrument DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL WARNING Warning statements identify condition or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property DANGER High Voltage ATTEN
6. on the input terminal directly Protection 450V dc or peak ac continuous 10 DIODE CHECK Description Display read forward voltage of diode Open Voltage 3 1V approx Maximum Forward Voltage i Protection 450V dc or peak ac continuous 10 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 11 CONTINUITY BEEPER Description Built in buzzer sounds when conductance is less than 5 ohm Open Voltage 3 volts maximum Protection 450V dc or peak ac continuous 12 ENVIRONMENTAL Operation Environment Indoor use altitude up to 2000m Ambient Temperature 0 C to 50 C Relative Humidity 75 Maximum Installation category II Pollution Degree 2 Storage temperature 10 C to 70C Relative Humidity Up to 75 0C to 35 C Up to 50 35 C to 50 C except the ranges of 2MQ and 20MQ which are up to75 0 C to 35 C 13 GENERAL Maximum Common 500V dc or peak ac low terminal potential with respect Mode Voltage to power line ground Warm Up 0 5 hours to achieve rated accuracy Power source AC 100V 120V 220V 230V 10 50 60Hz 12 5VA 10 5W Test Lead x1 Accessories Instruction manual x 1 Interface manual x 1 Dimension 251 W x91 H x291 D m m Weigh Approx 2 6 kg gt ground WARNING To avoid electrical shock the power cord protective grounding conductor must be connected to A CAUTION To avoid damaging the
7. the max mode the maximum value is converted to dBm To release the dBm function press dBm again The dBm mode AC Hz mode and Compare are not selected concurrently The reference impedance can be set to any of 21 reference impedances listed in the Table 5 1 according to the steps as follows 1 Press SHIFT SET in sequence into SET mode 2 Press REF Q to reference impedance selection The value displayed on the primary display is the current setting value 3 Select the required impedance by using W and A then press ENTER to save the data or press SHIFT to cancel the setting Table 5 1 8000 300 93 1200 250 75 1000 150 50 900 135 16 800 125 8 600 124 4 500 110 2 5 6 AC Hz measurements The function can be selected only when ac range is selected Press SHIFT then press AC Hz the secondary display shows the frequency of the input signal that is higher than the sensitivity The frequency measurement does not depend on the max min rel or hold mode In this mode the reading rate of the DMM may be slower than the normal state To release the AC Hz function press AC Hz again The dBm mode and AC Hz mode and Compare are not selected concurrently 17 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 5 7 AC DC measurements The function can be selected only when voltage or current function is selected Press AC DC button the primary display shows the true rms value of the input si
8. waveforms a signal with a crest factor above 3 0 is unusual 23 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL Figure 6 2 Crest Factor WAVEFORM CREST FACTOR SOURARE WAVE SINE WAVE TRIANGLE SAWTOOTH AY MIXED FREQUENCIES SCR OUTPUT OF 100 10 AC COUPLED PULSE TRAIN i 1 414 to 2 0 1 414 to 3 0 3 0 to 4 0 24 DUAL DISPLAY DIGITAL MULTIMETER DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL USER MANUAL 7 MAINTENANCE 7 3 Line voltage conversion The primary winding of the power transformer is tapped to permit operation from 100 120V or 220 230V AC 50 60Hz line voltage Conversion from one line voltage to another is done by changing the The following instructions are executed by qualified personnel only To avoid electrical shock do not perform any servicing other than the operating instructions unless you are qualified to do so line voltage selector switch as shown in Figure 4 2 The rear panel 7 1 Line fuse replacement j l 7 f If the fuse blows the DMM would not work Try to determine and identifies the line voltage to which the unit was factory set To convert correct the cause of the blown fuse then replace the fuse with correct to a different line voltage perform the following procedure rating and type shown as below 1 Make sure the power cord is unplugged 2 Adjust the line voltage selector switch to the desired line vo
9. DC or peak AC above earth ground gt DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL Figure 4 1 Front Panel Secondary Display Primary Display Input Terminals aaeeiais 55 20A AL 20A B EE2906 GWINSTEK Push Buttons Figure 4 2 Rear Panel p Interface Terminal m F voc neo SA Si woureee AEEODE OPENA Ge ae E2 E CE L z f l wiy Line Voltage Selector and Input Fuse Holder _ _ AC Power Line Connector 14 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 5 MEASUREMENT TUTORIAL 5 1 Voltage measurements DCV ACV DCmV ACmV 1 Press the button to select desired function 2 Press AJor W to the desired range if you have no idea about the value of input we suggest you always start at the highest range Press AUTO MAN button for manual or auto ranging selection 3 Connect the test lead to the V and COM input terminals of the instrument 4 Connect the test lead to the measuring points and read the displayed value NOTE After measuring high voltage to 1000V dc errors may occur when the 100 u V is measured Allow up to one minute prior to making low level measurements 5 2 Current measurements DCA DC 20A ACA AC 20A 1 Press the button to select function 2 Press A or W to the desired range if you have no idea about the value of input we suggest you always start a
10. Dual Display Digital Multimeter GDM 8246 USER MANUAL GW INSTEK PART NO 82DM 82460MH1 Dx ISO 9001 CERTIFIED MANUFACTURER GW INSTEK DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL This manual contains proprietary information which is protected by copyrights All rights are reserved No part of this manual may be photocopied reproduced or translated to another language without prior written consent of Good Will company The information in this manual was correct at the time of printing However Good Will continues to improve products and reserves the rights to change specification equipment and maintenance procedures at any time without notice Good Will Instrument Co Ltd No 7 1 J hongsing Rd Tucheng City Taipei County 236 Taiwan EC Declaration of Conformity We GOOD WILL INSTRUMENT CO LTD 1 No 7 1 Jhongsing Rd Tucheng City Taipei County 236 Taiwan 2 No 69 Lu San Road Suzhou City Xin Qu Jiangsu Sheng China declare that the below mentioned product Type of Product Dual Display Digital Multimeter Model Number GDM 8246 are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility 2004 108 EC and Low Voltage Directive 2006 95 EC For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Directive the following standards were applied
11. TION refer to Manual Protective Conductor Terminal ground Earth Terminal i oee e e Frame or Chassis Terminal DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL FOR UNITED KINGDOM ONLY NOTE This lead appliance must only be wired by competent persons WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this lead are coloured in accordance with the following code Green Yellow Earth Blue Neutral Brown Live Phase As the colours of the wires in main leads may not correspond with the colours marking identified in your plug appliance proceed as follows The wire which is coloured Green amp Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol D or coloured Green or Green amp Yellow DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red If in doubt consult the instructions provided with the equipment or contact the supplier This cable appliance should be protected by a suitably rated and approved HBC mains fuse refer to the rating information on the equipment and or user instructions for details As a guide cable of 0 75mm should be protected by a 3A or 5A fuse Larger conductors would normally require 13A ty
12. eeding 75 Accuracy is expressed as percentage of reading digits The AC specification is based on the 50 of duty cycle The power cord protective grounding conductor must be connected to ground 1 DC VOLTAGE OR DCV OF RIPPLE FUNCTION RESOLUTION ACCURACY INPUT IMPEDANCE IMO MIMA MO TMA 50V ImV 0 02 4 10 1MQ DCV Input Impedance Approx 1OM in parallel with lt 100pF all ranges DCV of Ripple Function 5V 500V 3 ranges DCV of Ripple Input 10MQ 10MQ in parallel with lt 100pF Impedance Normal Mode Rejection Ratio gt 60dB at 60Hz or 50Hz Common Mode Rejection Ratio gt 90dB at 60Hz or 50Hz Common Mode Voltage Maximum 500V dc or peak ac 450V dc or peak ac continuous on 500mV range and Maximum Input ripple function 1000V dc or peak ac continuous on other range When the input exceeds the full scale of the selected range the display will appear OL of over range indication DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 2 TRUE RMS AC AC DC VOLTAGE Accuracy between 2 of range and full range 20Hz 50Hz 2kHz 10kHz 20kHz SOkHz RANGE si 10kHz 20kHz 50kHz 100kHz saen 2 20 5 50 1 10 0 3 30 0 4 50 Input Impedance Approx 1OMQ in parallel with lt 100pF all ranges 450V dc or peak ac continuous on 500mV range Maxi Input peti 1000Vrms on other range Crest Factor
13. f the setting value is more than 50000 counts the panel will again display 60000 The AUTOHOLD mode allows you to keep your eyes fixing on the 2 The flickering digits can be adjusted by pressing A to set the probes when taking measurements in difficult or hazardous value and pressing W to move the adjusted position Also circumstances then read the display when it is convenient and safe Press SHIFT AUTOHOLD in sequence into AUTOHOLD mode every time when the value is more than the 8 of full scale and can adjust the plus and minus sign through A and W 3 When the setting is completed press ENTER to save the setting or press SHIFT to cancel the setting with 200 counts of different value compared with the previous AUTOHOLD value the data on the primary display will be updated In the AUTO range mode when the value is less than 10 full scale and more than 0 8 full scale it will change range downward 5 12 RIPPLE MEASUREMENT The RIPPLE mode can monitor DC level and AC ripple of power supply In DCV voltage function set to RIPPLE mode by pressing automatically If want to release AUTOHOLD function press SHIFT RIPPLE in sequence the primary display will show DCV SHIFT AUTOHOLD in sequence 5 11 COMPARE MEASUREMENT In Compare mode can set the maximum and minimum value to value with the ranges of 5V 50V and 500V the secondary display will show AC component of signal with the range of 500mVac
14. gnal including the ac component and dc component In this mode the reading rate of the DMM is slower than the normal state To release the AC DC function press other function voltage ac or dc current ac or dc R C Continuity Beeper Diode Test key 5 8 MAX MIN measurements The MAX MIN mode causes the DMM to hold the lowest and highest readings Press MAX MIN button to the MAX mode The highest will be displayed in continuous input In the MAX mode press MAX MIN button to the MIN mode The lowest will be displayed in continuous input In the MIN mode press MAX MIN button to release the MAX MIN mode 5 9 REL measurements When the REL button is pressed the meter stores the present reading and displays subsequent measurements as the difference between the measured value and the stored reading In the MAX MIN mode set REL button to the REL mode The maximum or minimum reading will become the relative base 18 DUAL DISPLAY DIGITAL MULTIMETER DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL USER MANUAL 5 10 HOLD and AUTO HOLD measurements 1 Select the required function and range set maximum or The HOLD mode can keep the measured value on the primary minimum value by pressing SHIFT SET and HI or LO in display Press HOLD button the last reading is held on the display in all function To release the HOLD function just press HOLD sequence Now the panel is displaying the current setting value i
15. instrument do not use it in a place where ambient temperature exceeds 50 C DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 4 OPERATION INSTRUCTIONS 4 1 Front panel and rear panel The front panel shown in Figure 4 1 contains three main elements the input terminals the primary and secondary displays and the push buttons The rear panel shown in Figure 4 2 contains the AC power line connector and fuse amp line voltage selector input fuse holder and interface terminal 4 2 The SHIFT key and function keys SHIFT button is used to enable the secondary function of certain function keys that with blue symbols printed above The SHIFT LED will be on after pressed the SHIFT button At this time only the buttons with blue symbols are workable To release SHIFT function press SHIFT again For example to select DCmV function press SHIFT then press DCV DCmV 4 3 Set mode Press SHIFT SET in sequence into SET mode then proceed further setting by pressing the white characters with blue background HI LO REF RS232 GPIB ENTER sequentially 4 4 Warm up The instrument requires half an hour warm up to achieve rated accuracy 4 5 Over range indication An input is over range if it exceeds the full scale of the selected range GDM 8246 indicates an input is over range by lighting the OL pattern on display 4 6 No specification indication On AC Hz measured mode when an input is le
16. ltage position 3 A change in line voltage may also require a corresponding change of fuse value Install the correct fuse value as listed on rear panel 7 2 Current fuse replacement The current fuse protects the 500 u A 2A range from an input 7 4 Cleaning current greater 2A To replace the current fuse perform the following To keep the instrument clean wipe the case with a damp cloth and steps detergent Do not use abrasives or solvents 1 Turn off the power disconnect the power line and remove the test leads 2 Place the end of a flat blade screwdriver into the slot of the fuse holder on the front panel Push and carefully rotate the fuse carrier turn counterclockwise till remove the fuse and the fuse carrier off the front panel 3 Remove the defective fuse and replace the correct fuse T2A 250V 1 5kA breaking capacity Remark There is a F20A fuse built inside the case located on F301 if any damage occurred on this fuse please return to the manufacturer for repair 25 26
17. ngs for true rms meters and average responding meters Figure 6 1 will help you convert between the two measurement methods 21 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL Figure 6 1 Voltage Conversion AC COUPLED INPUT WAVEFORM RECTIFIED SINE FULL WAVE RECTIFIED SINE HALF WAVE RECTIFIED SOUARE ac component oniy COMPONENT ONLY ac RAM RECTANGULAR PULSE _ x PK PK Sirle F D x Y K y 0D TRIANGLE SAWTOOTH PK o PKPK BEK 13 DISPLAY RMS FOR SINE WAVES Your Digital Multimeter 22 RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING METERS THAT ARE CALIBRATED TO DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 6 3 AC DC measurement A signal includes an ac component and a dc level The relationship between the total rms value of the signal and the ac component and the dc component is rms total I ac component rms dc component 6 4 Crest factor Crest factor is often overlooked in determining the accuracy of an ac measurement Crest factor is defined as the ratio of the peak signal amplitude to the rms value of the signal If an input signal has a crest factor of 3 0 or less voltage measurements will not be in error due to dynamic range limitations at full scale The waveforms in Figure 6 2 show signals with increasing value of crest factor As you can see from the series of
18. pes depending on the connection method used Any moulded mains connector that requires removal replacement must be destroyed by removal of any fuse amp fuse carrier and disposed of immediately as a plug with bared wires is hazardous if a engaged in live socket Any re wiring must be carried out in accordance with the information detailed on this label DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 2 INTRODUCTION This is a portable bench type dual display digital multimeter with a good performance 50000 counts designed for general purpose application The dual display allows you to display two functions of the input signal being measured Features 50000 counts DMM Multi function ACV DCV ACA DCA R C Hz Continuity Beeper Diode Test MAX MIN REL dBm HOLD Autohold Compare Dual display Indicate ACV and Hz DCV ACV and dBm or DCV and ACV ripple Manual or Autoranging 0 02 DCV accuracy 20A high current range 1000V high voltage range AC True RMS or AC DC True RMS ACV frequency response 100kHz The reference impedance selectable in the dBm modifier Auto recall the setting upon power on Interface RS232 Standard and GPIB option DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 3 SPECIFICATIONS The specifications are operated under the essential conditions as follows A 1 year calibration cycle An operating temperature of 18 to 28 C 64 4 to 82 4 F Relative humidity not exc
19. ss sensitivity the secondary display show When the frequency of an input exceeds 110kHz the primary display will show DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 4 7 Interface Operation This instrument equips RS 232 as standard device with a D SUB 9 PIN SHELL on the rear panel Besides the instrument also provides a GPIB option device with a 24 PIN SHELL in blue The configuration is compliance with IEE488 For further detailed operation please refer to the Interface manual 4 8 Input overload protection The maximum allowable input is shown as table 4 1 Please proceed the measurement accordingly Table 4 1 FUNCTION RANGE MAXIMUN INPUT DCV 5V 1000V 1000Vdc or peak ac ACV AC DC 5V 1000V 1000V rms continuous amp 10 VeHz maximum DCA ACA AC DC 500 u A 2A fuse protected T2A 250V 1 5kA breaking capacity DC AC20A AC DC 20A fuse protected F20A 600V 100kA breaking capacity DC ACmV AC DC 500mV 450V dc or ac peak OHM all ranges 450V dc or ac peak CAPACITANCE all ranges 450V dc or ac peak RIPPLE all ranges 450V dc or ac peak WARNING To avoid shock hazard and or instrument damage do not apply input potentials that exceed the input overload limits shown in table 4 1 4 9 Input connections to common WARNING To avoid shock hazard and or instrument damage do not connect the common input terminal to any source of more than 500 volts
20. t the highest range Press AUTO MAN button to change manual or auto ranging 3 Connect the test lead to the 2A or 20A and COM input terminals of the instrument 4 Connect the test lead to the measuring points and read the displayed value 15 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL 5 3 Resistance capacitance continuity beeper measurements 1 Press the button to select function 2 Press AJor W to the desired range Press AUTO MAN button to change manual or auto ranging 3 Connect the test lead to the Q 4 and COM input terminals of the instrument 4 Connect the test lead to the measuring points and read the displayed value 5 4 Diode test measurements 1 Press the button to select function 2 Connect the test lead to the r and COM input terminals of the instrument 3 Connect the test lead to the semiconductor junction diode or transistor as shown in Figure 5 1 and read the displayed value Figure 5 1 Connect to Connect to o p COM terminal terminal 5 5 dBm measurements This function converts a voltage measurement into dBm The function can be selected only when a voltage function volts ac volts dc or volts act dc is selected Press dBm button the secondary display shows the dBm value that reposed on the voltage value showed in the primary display 16 DUAL DISPLAY DIGITAL MULTIMETER USER MANUAL For example if dBm is pressed when measuring voltage in
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