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dual display digital multimeter model: GDM-8246 user manual good will instrument co., ltd. gw part no. 82dm-82460ma printed in taiwan october 2002 all rights reserved 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 wa s 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. 95-11, pao-chung road, hsin-t ien city, taipei hsien, taiwan free datasheet http://
declaration of conformity we good will instrument co., ltd. no. 95-11, pao-chung rd., hsin-tien city, taipei hsien, taiwan good will instrument (suzhou) co., ltd. no.69 lushan road, suzhou ne w district jiangsu, china. declares that the below mentioned products GDM-8246 are herewith confirmed to comply with the requirements set out in the council directive on the approximation of th e law of member states relating to electromagnetic compatibility (89/336/eec, 92/31/eec, 93/68/eec) and low voltage equipment directive (73/23/eec). for the evaluation regarding the electromagnetic compatibility and low voltage equipment directive, the fo llowing standards were applied: emc en 61326-1: electrical equipment for measur ement, control and laboratory use ?? emc requirements (1997+a1: 1998) conducted and radiated emissions en 55011: 1998 electrostatic discharge en 61000-4-2: 1995+a1:1998 current harmonic en 61000-3-2: 1995+a1: 1998+a2: 1998 +a14: 2000 radiated immunity en 61000-4-3: 1996+a1 :1998 voltage fluctuation en 61000-3-3: 1995 electrical fast transients en 61000-4-4: 1995 ------------------------- surge immunity en 61000-4-5: 1995 ------------------------- conducted susceptibility en 61000-4-6: 1996 ------------------------- voltage dips/ interrupts en 61000-4-11: 1994 safety low voltage equipment directive 73/ 23/eec & amended by 93/68/eec en 61010-1 : 2001 iec 61010-1: 2001 dual display digital multimeter user manual 4 table of contents page 1. safety summary?????????????????? 1 2. introduction???????????????????.. 5 3. specification???????????????????.. 6 4. operation instruction??????????????. 12 5. measurement tutorial?...????????????. 15 6. measurement techniques......??????????? 21 7. maintenance???????????????????... 25 free datasheet http://
dual display digital multimeter user manual 1 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 measurem ent 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 categor y 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 2 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 attention refer to manual protective conductor terminal (ground) earth terminal frame or chassis terminal free datasheet http://
dual display digital multimeter user manual 3 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 & yellow must be connected to the earth terminal marked with the letter e or by the earth symbol or coloured green or green & yellow. free datasheet http://
dual display digital multimeter user manual 4 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 2 should be protected by a 3a or 5a fuse. larger conductors would normally require 13a types, depending on the connection method used. any moulded mains connector that requires removal /replacement must be destroyed by removal of any fuse & 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 5 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 z 50000 counts dmm z multi-function acv, dcv, aca, dca, r, c , hz, continuity beeper, diode test, max/min, rel, dbm, hold, autohold, compare. z dual display indicate acv and hz, dcv (acv) and dbm or dcv and acv ripple. z manual or autoranging z 0.02% dcv accuracy z 20a high current range z 1200v high voltage range z ac true rms or ac+dc true rms. z acv frequency response 100khz. z the reference impedance selectable in the dbm modifier. z auto-recall the setting upon power on. z interface rs232 (standard) and gpib (option). free datasheet http://
dual display digital multimeter user manual 6 3. specifications the specifications are operated under the essential conditions as follows: z a 1-year calibration cycle. z an operating temperature of 18 to 28 (64.4 to 82.4 H ). z relative humidity not exceeding 90%. z accuracy is expressed as (percentage of reading + digits). z the ac specification is based on the 50% of duty cycle. 1. dc voltage or dcv of ripple function range resolution accuracy 500mv 10 v 5v 100 v 50v 1mv 500v 10mv 1200v 100mv 0.02%+4 dcv input impedance 10m in parallel with <100pf, all ranges. dcv of ripple function 5v~500v 3 ranges. dcv of ripple input impedance 10m ?M M 10m in parallel with <100pf. normal mode rejection ra tio >60db at 60hz or 50hz. common mode rejection rati o >90db at 60hz or 50hz. common mode voltage (maximum) 500v dc or peak ac. maximum input 450v dc or peak ac continuous on 500mv range an d ripple function. 1200v 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 7 2. true rms ac, ac+dc voltage accuracy between 2% of range and full range. range 20hz- 50hz 50hz- 2khz 2khz- 10khz 10khz- 20khz 20khz- 50khz 50khz- 100khz 500mv 5v 50v 2%+20 5%+50 500v 0.5%+50 -------- -------- 1000v 1%+10 0.3%+30 0.4%+50 -------- -------- -------- input impedance 10m in parallel with < 100pf,all ranges. maximum input 450v dc or peak ac continuous on 500mv range. 1000vrms on other range. crest factor 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 50hz- 2khz 2khz- 10khz 10khz- 20khz 20khz- 50khz 50khz- 100khz 500mv 1%+10 0.3%+30 0.4%+50 0.5%+50 2%+20 5%+50 input impedance 10m ?M M 10m in parallel with < 100pf. maximum input 450v dc or peak ac continuous. crest factor range 3.0 at full scale. when the input exceeds the full scale of the selected range, the display will appea r ??ol?? of over-range indication. free datasheet http://
dual display digital multimeter user manual 8 4. frequency measurement at acv range range frequency input level (sine wave) accuracy 10hz ~ 50khz R 1 20mv 500mv 50khz ~ 150kh z R 200mv 5v 10hz ~ 200khz 50v 20hz ~ 200khz R 1.2v 500v 20hz ~ 20khz R 12v 0.05%+1 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 a 0.01 a 5ma 0.1 a 50ma 1 a 0.7vmax. 500ma 10 a 0.05% +3 2a 100 a 0.8vmax. 20a 1ma 0.2% +5 0.9vmax. protection fuse protection for 500 a,5ma,50ma,500ma,2a and 20a ranges, 20a range input for 15 seconds max. 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 9 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 500 a 5ma 50ma 500ma 1%+15 2%+15 2a 20a 1%+15 0.5%+15 protection fuse protection 500 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 fu ll scale of the selected ra nge, the display will appear ??ol?? of over-range indication. 7. frequency measurement at aca range range frequency input level (sine wave) accuracy 500 a 10hz ~ 20khz R 90 a 5ma 10hz ~ 20khz R 0.9ma 50ma 10hz ~ 20khz R 9ma 500ma 10hz ~ 20khz R 90ma 2a 10hz ~ 2khz R 1a 20a 10hz ~ 2khz R 9a 0.05%+1 ac+dc measurement does not support ac+hz function. free datasheet http://
dual display digital multimeter user manual 10 8. resistance range resolution accuracy 500 0.01 0.1%+4 5k 0.1 50k 1 500k 10 0.1%+2 5m 100 0.2%+2 20m 1k 0.3%+2 open-circuit voltage 3.2 volts maximum on 500 , 5k 1.3 volts maximum on all other ranges. protection 450v dc or peak ac continuous. 9. capacitance range: resolution accuracy 5n * 0.001n R 1nf: 2%+10 <1 nf & R0.5nf : 2%+20 50n 0.01n R 10nf: 2%+10 <10 nf & R5 nf: 2%+30 500n 0.1n 5 1n 50 10n 2%+4 *5n range tends to be interfered by the te st lead?s impedance and position. for the accuracy, please measure the range on the input terminal directly. protection 450v dc or peak ac continuous. 10. diode check description display read forwar d voltage of diode. open voltage 3.1v approx. maximum forward voltage 1.5v protection 450v dc or peak ac continuous. dual display digital multimeter user manual 11 11. continuity beeper description built in buzzer sounds when co nductance 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 to 50 . relative humidity 80% (maximum). installation category ii pollution degree 2 storage temperature -10 to 70 . relative humidity up to 90%, 0 to 35 , up to 50%, 35 to 50 , except the ranges of 2m and 20m which are up to 80% , 0 to 35 . 13. general maximum common mode voltage 500v dc or peak ac ( low terminal potential with respect 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. accessories test lead 1 instruction manual 1, interface manual 1 dimension 251(w) 91(h)291(d) m/m weigh approx. 2.6 kg wa r n i n g to avoid electrical shock, the power cord protective grounding conductor must be connected to ground. caution to avoid damaging the in strument, do not use it free datasheet http://
dual display digital multimeter user manual 12 in a place where ambient temperature exceeds 50 . dual display digital multimeter user manual 13 4. operation instructions 4-1. front panel and rear panel the front panel, shown in figure4-1, 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 & 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 th e 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 less sensitivity, the secondary display show ? ?. when the frequency of an input exceeds 110khz, the primary display will show ? ?. free datasheet http://
dual display digital multimeter user manual 14 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~1200v 1200vdc or peak ac acv (ac+dc) 5v~1000v 1000v rms continuous & 10 7 v?hz maximum dca,aca(ac+dc) 500 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 dc or peak ac above earth ground. dual display digital multimeter user manual 15 z figure 4-1 front panel z figure 4-2 rear panel free datasheet http://
dual display digital multimeter user manual 16 5. measurement tutorial 5-1. voltage measurements (dcv, acv, dcmv, acmv) 1).press the button to select desired function. 2).press [ ]or[ ]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 meas uring points and read the displayed value. note: after measuring high voltage to 1000v dc, errors may occur when the 100 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 [ ]or[ ]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 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 meas uring points and read the displayed value. dual display digital multimeter user manual 17 5-3. resistance, capacitance, co ntinuity beeper measurements 1). press the button to select function. 2). press [ ]or[ ]to the desired range. press [auto/man] button to change manual or auto-ranging. 3). connect the test lead to the , 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 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. z figure 5-1 connect to connect to ? ? ?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 ac+dc) is selected. press [d bm] button, the secondary display shows the dbm value that reposed on the voltage value showed in the primary display. free datasheet http://
dual display digital multimeter user manual 18 for example, if [dbm] is pressed when measuring voltage in 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 ] to reference impedance selection . the value displayed on the primary display is the current setting value. 3) select the required impedance by using [ ] and [] , 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. dual display digital multimeter user manual 19 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 signal 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. free datasheet http://
dual display digital multimeter user manual 20 5-10. hold and auto hold measurements the hold mode can keep the measured value on the primary display. press [hold] button, the la st reading is held on the display in all function. to release the ho ld function, just press [hold] again. the autohold mode allows you to keep your eyes fixing on the probes when taking measurements in difficult or hazardous 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 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 s cale, it will change range downward automatically. if want to release autohold function, press [shift] [autohold] in sequence. 5-11. compare measurement in compare mode, can set the maximum and minimum value to compare with the curr ent measured value. the secondary display will show ?hi? when the measured value is more than the maximum value, will show ?lo? wh en the measured value is less 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: dual display digital multimeter user manual 21 1) select the required function and range, set maximum or minimum value by pressing [shift][set] and [hi] or [lo] in sequence. now the panel is displaying the current setting value, if the setting value is more than 50000 counts, the panel will display 60000. 2) the flickering digits can be adjusted by pressing [ ] to set the value, and pressing [ ] to move the adjusted position. also can adjust the plus and minus sign through [ ] and [ ]. 3) when the setting is completed, press [enter] to save the setting, or press [shift] to cancel the setting. 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 [shift][ripple] in sequence, th e primary display will show dcv value with the ranges of 5v, 50v, and 500v, the secondary display will show ac component of signal with the range of 500mvac, 100khz frequency response. the function is easy to detect dc and ac components of signal simultaneously. if want to leave the ripple mode, just switch to other main function. free datasheet http://
dual display digital multimeter user manual 22 6. measurement techniques 6-1. dbm measurement technique dbm is defined as above or below a 1mw reference. a voltage measurement is converted to dbm using the following formula: dbm=10*log 10 (1000*voltage value 2 /reference impedance.) the reference impedance can be set. for example, the reference impedance of 600 , 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 readings for true rms meters and average-responding meters. figure 6-1 will help you convert between the two measurement methods. dual display digital multimeter user manual 23 z figure 6-1: voltage conversion free datasheet http://
dual display digital multimeter user manual 24 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= 2 2 component) (dc rms) component c ( + a 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 waveforms, a signal with a crest factor above 3.0 is unusual. dual display digital multimeter user manual 25 z figure 6-2: crest factor free datasheet http://
dual display digital multimeter user manual 26 7. maintenance 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. 7-1. line fuse replacement if the fuse blows, the dmm would not work. try to determine and correct the cause of the blown fuse, then replace the fuse with correct rating and type shown as below: fuse rating and type 100/120v t0.16a 250v 220/230v t0.08a 250v f101 on pcb t0.5a 250v 7-2. current fuse replacement the current fuse protects the 500 a~ 2a range from an input current greater 2a.to replace the current fuse, perform the following steps: 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. dual display digital multimeter user manual 27 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 line voltage selector switch as shown in figure 4-2. the rear panel identifies the line voltage to which th e unit was factory set. to convert to a different line voltage, perform the following procedure: 1). make sure the power cord is unplugged. 2). adjust the line voltage selector switch to the desired line voltage position. 3). a change in line voltage may also require a corresponding change of fuse value. install the correct fu se value as listed on rear panel. 7-4. cleaning to keep the instrument clean, wipe the case with a damp cloth and detergent. do not use abrasives or solvents. free datasheet http://

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