取扱説明書／1.2MB
Contents
1. FUNCTION OHM Key bl 2000 VY YKCREL 00000 C Q ZERO 2k9Q C1 9900 KN 1 9900 KO VRE 200kO 199 00 KO DAWANBZTrIELIT 19900kQO LARC VR 2000 kQ VYDRA 1990 0 kQ 1990 0 KO ZARIE VR8 5 1 5 5 0 00 5 R5 1 0 03 R5 2 19900V 19 889 19 911 TITTI NEST ra 10000A 9967 100 33 i SEGTION 1 12. MANU K AUTO FUNCTION DC RUA CREL RANGE FUNCTION AC DC AC CREL FV RANGE KK C FUNCTION AC A CREL RANGE KK C
3. gt EE EI 10 ppm C tk F C 100kHz A AC90 1830V AC200 260V 2 IC 58YV 4 9V 5 7V SEGTION i 51 B3 20 KC 8 52 5 1 C Mi bi bak
4. SECTION 1 fii ft ik 3 1 32 33 34 fl E ew 3 5 fe B 41 fF 51 52 i fi 53 f iE oo o 12 12 15 15 15 16 ill SECTION 1 1 4 1 2 10zV 1000V 104A 1ARURH 0 010 20M0 LCD
5. 5 SEGTION i SAMPLA4 9 Q ZERO DA OR l DOWN MANU M 5 UP MANU HOLD RUN QJ 1800 PV Al 20000
6. L S I SECTION 1 2 DME 1400 E LCD 42 C19999 qam FORK R JR AC DC mV V mA 4A Q kQ MQ m EC 23 C 5 C RH lt 80 AAP x 200mV 0 04 rag 0 02 f s 102v L 1100V 10 aen roay JI ET 0 0 3 dg 0 01 f s 1004v 500VGIERE 20 V 0 04 rdg 0 02 f s 1mV rdg s wane 200 V 0 04 rdg 0 01 rs 10MQ 0 06 rdg 0 02 f s G 60dB 50 60Hz 01 120dB 50 60Hz 0 1 1kO TA E E 23C 45C RH lt 804 WE 04 rdg 01 fs 104V 210 Q 1000Vrms 10 02 rdg 005 f s 1004V lt 100pF 500Vrms GEE 20 V 1mV 10MO 1000Vrms 10mV lt 100pF very GA 45Hz 1kHz 0494rdg 04 f s
7. SEGTION 1 3 2 1 2 De Zink Wta XkwAx 2 OE E WA DAC F KK C C 14 014 90 130 V 200 260V AC AC K KK 3 3 1 2 3 3 4 1 2 3 4 6 SECTION 1
8. 2000 2kQ 2000 L 00 00 OQ KK ADCN ATH 7 DC 500V AC 500Vrms CH 4 VO 10 0000 19999 BANOR eae HARE LEF AC DC mV V mA A Q kQ MODEL SEGTION 1
9. Vr 06V R C 3 5 7 D FUNCTION Q 2 RANGE K 3 9 4 1800 SECTION 1 4 41 4 1 kid EE AC DC rrr EY Ml 4 1
10. 4 D 10 001 30 002 10 000 HEEE A 0 20001 3 1 40 002 l X Gn IRER 100kH2 OKMIEMIEERLINBB 100msec ERD SECTION 1 4 1 5 4 1 6 4 1 7 4 1 8 vy C CMOS LSI 19999 AUTO 20000 1800 C MANU Up DOWN ge LSI CH
11. A E J AC 100V 50Hz 1 8 VA st 180 W x 60 H X 150 D mm se B 195 W X 70 H X 170 D mm f 1 3 kg 1 1 O1A 1 1A 1 SECTION 1 31 M 3 1 POWER BROWN ETS FUNCTION l a VI Al l AC DC BE AC DC AC DC DRANGE MANU AUTO AUTO
12. SECTION i 4 1 1 SEB DMB HURE tE AD ayn DADER DE VN 10M aD z Z LITOT A D l SW 1 SWI SW2 TA ERLI Yy Yy gt we OM 10 01k ASD KK SW2 4 2 4 12 AC DC LUIE MA OHMS nN ACZDC 413 l ZE DEMEN HE 4 1 4 A D A D BORE CMOS HEIN L VIRB RBI E o
13. Kh E FUNCTION RANGE MANU AUTO DOWN 2000 00 00 0 CC Q ZERO RANGE KK K C SECTION 1 3 56 1 FUNCTION QO 2 RANGE 2kQ KK 3 C KC 4 rr 1mA Vp KOE VCH 5
14. 199 00mVMC Epo Let 199 00mV CHALIIC VR2 200V vvv 199 00V 199 00V K VRS 1000V 1000 0V CREL COR 10000VC CVR4 FUNCTION AC V Wey BL 2V K 6 005 1 9900V 400Hz 1 9900V CARE VRS 200V 199 00V 1kHz CREL C 199 00V CHARIC VC2 5 3 3 1 2 3 4 5 3 4 1 SECTION ABA DEHRA CLOMCHEF DEL HCE FD
15. D AC LINE VOLTAGE 90V 130V Mit 200V 260V 50 60Hz C AC AC AC125V CEE DC1000 AC1000V rms DC500V AC500Vrms C 200mV 2V 500 V 1100V 10 MUA 20V 1000Y 1100V EE 200mV 2V SOOVrms 1000Vrms 10
16. 20V 1000VUY y 1000Vrms 11A 11A U 200V il amp C C D AC K 30 SEGTION 1 3 5 3 5 1 3 5 3 5 3 5 1 2 4 5 1 2 1 3 4 1 2 1 2 3 4 5 6 FUNCTION AC DC DC V RANGE K
17. T POWER switch AC main power ON OFF switch The depressed and locked state is for ON If it is pressed again it pops up to the unde pressed state which is for OFF 2 FUNCTION selector switches These pushbutton switches are for selecting the measuring functions of the multimeter Q button To select the resistance measuring mode V button To select the voltage measuring mode A button To select the current measuring mode AC DC button To select the AC or DC mode for voltage or current measurement The depressed state is for AC and the undepressed state is for DC SECTION 2 RANGE selector switches These pushbutton switches are for selecting the measuring ranges MAN AUTO button The depressed state is for manual range change and the undepressed state is for automatic range change DOWN button To select lower ranges when in MAN mode UP button To select higher ranges when in MAN mode 4 SAMPLE switch At the instant this button is depressed and locked the mea sured value of that instant is held continuously As this button is pressed again and released to the undepressed state the HOLD state is reset to the RUN state and measurement of the instantaneous value resumes 5 BUZZER switch This button is for on off control of the alarm buzzer for resistance underrange or for voltage or current overrange If the button is in the depressed state the buzzer sounds as follows Q mode
18. DIGITAL MULTIMETER Operation Manual The contents of this manual including the specifications of the instrument are subject to change without notice 1998 Kikusui Electronics Corporation Kikusui Part No Z1 112 210 1A001021 Printed in Japan SECTION 1 DME1400 SECTION 1 JAPANESE MANUAL SECTTON 2 ENGLISH MANUAL 1 1 2 3
19. selected 3 Short the end tips of the test leadwires and set the displayed value to 00 002 with the 2 ZERO potentiometer on the front panel 93 SECTION 2 4 5 1 2 3 4 5 1 2 3 4 Select the required range with the RANGE selector If the resistance of the object to be measured is unpredictable set the instrument to the AUTO mode Connect the test leadwires across the object to be tested and read the indicated value Diode Check Depress and lock the fi button of the FUNCTION switch Select the 2k range with the RANGE selector Connect the test leadwire of the l input terminal of the instru ment to the cathode which normally is indicated with a stripe pattern cathode mark and the test leadwire of the input termi nal to the anode of the diode to be tested The displaved value when in the above state denotes the forward direction voltage Vp of the diode with Ip 1 mA For the unit of measure read k as V The Vp of the normal silicon diode is approximatelv 0 6 V although it may differ by type of diode and test temperature If the diode is connected in the reverse polaritv the instrument will indicate an overrange alarm Continuitv Test Depress and lock the 2 button of FUNCTION selector Select the required range with the RANGE selector Depress and lock the BUZZER button Apply the test leadwires across the me
20. 1100 V continuous Normal mode rejection ratio 60 dB or over 50 60 Hz 0 1 Effective common mode rejection ratio 120 dB or over 50 60 Hz 0 1 1 kQ unbalanced SECTION 2 AC Voltage Measurement 23 C 5 C 73 F 499F RH lt 80 Frequency Accuracy Resolu 1 Maximum response tion i allowable S input voltage 0 4 of reading 10 uv 1000 Vrms 0 1 of range 10 Q 10 sec t 0 2 of reading 100 uv lt 100 pF 500 Vrms 0 05 of range continuous 4 of reading 1000 Vrms 1 of range continuous Range selection Automatic or manual DC Current Measurement 23 C 5 C 73 F 49 F RH lt 80 Accuracy Resolution Input Maximum resistance allowable application current 0 3 of reading 0 03 of cing 10 va Range selection Automatic or manual Input protection Fuse SECTION 2 AC Current Measurement jil 23 C 59C 73 F 99F RH lt 802 Accuracy Resolu tion 45 Hz 0 6 of reading to 0 1 of range 1 Q 1 1 A l kHz 100 JA Range selection Automatic or manual Maximum allowable application current Frequency response Input protection Fuse Resistance Measurement i 20 kf 2000 kQ IT Range selection Automatic or manual 23 C 5 C 73 F 9 F RH lt 80 Resolution Measuring Maximum current allowable application voltage 0 05 of readin
21. 9900 kQ 3 Change the instrument to the 200k2 range and connect a standard resistor of 199 00 k between the input terminals Adjust potentio meter VR7 so that the instrument displays 199 00 kQ 4 Change the instrument to the 2000k2 range and connect a standard resistor of 1990 0 k between the input terminals Adjust potentio meter VR8 so that the instrument displays 1990 0 kf 5 3 4 Check of Measuring Ranges 1 After the instrument calibration is over check the measuring ranges of the instrument as shown in Table 5 1 to 5 5 21 SECTION 2 Table 5 1 DC voltage check 19 900 V 19 889 19 911 Calibration instrument Standard DC voltage generator accuracy 0 005 or better Table 5 2 DC current check 199 00 mA 198 35 199 65 1 0000 A 996 7 100 33 Calibration instrument Standard DC current generator accuracy 0 03 or better Table 5 3 AC voltage check 199 00 mV 400 Hz 198 01 199 99 19 900 V 400 Hz 19 801 19 999 199 00 V 400 Hz 198 01 199 99 1000 v 100 0 v 400 Hz 995 0 1005 0 Calibration instrument Standard AC voltage generator accuracy 0 02 or better Table 5 4 AC current Check 190 00 mA 400 Hz 188 66 191 34 1 0000 A 400 Hz gt 993 0 1007 0 Calibration instrument Standard AC current generator accuracy 0 05 orbetter JIL Table 5 5 Resistance check 200 RN 199 00 2 198 87 199 13 20 ki 19 90
22. SECTION 1 m g U 23C 5C RH lt 80 arp ADER man oe A 104A 4 v D A J dk 3E E 23C 5C RH lt 80 Mea A 104A 1004A E Peat RH lt 8 0 wenn SAARE meen il 104A 200V 2000K0 0 1 rdg 005 f s s EEN 100 20MO 0 3 rdg 0 191 5 1 EE a v 9 5V a OB OR Q ZERO BEET LOAN MT ICH anh SEGTION g 1 2kO Ir 1mA EL Fi KK 2 Vv 20000 1800 t f U B HA All E E EE 2 5 sec fil E 0C 40 C 20C 60 ER E E 90 130VRU200 260V 50 60Hz
23. TOP VIEW siga SECTION 2 5 3 Calibration It is most recommendable to calibrate the instrument at regular inter vals For better accuracy the instrument should be calibrated at an ambient temperature of approximately 23 C 73 F and allowing a warm up period of 30 minutes or over for stabilization For calibration follow the procedure covered in this section 3 1 AD 5 2 3 4 5 3 2 1 Calibration of DC Voltage Measuring Function Turn on the POWER switch set the Function selector to the V state and short the input terminals and check that the display is zero Set the instrument to the 2V range Using a standard DC voltage generator accuracy 0 005 or better apply an input voltage of 1 9900 V to the instrument Adjust potentiometer VRI on the side panel of the instrument so that the instrument displays 1 9900 V Change the instrument to the 200mV range Set the standard voltage generator output at 199 00 mV and apply it to the instrument Adjust the potentiometer VR2 on the lower PC board so that the instrument displays 199 00 mv Change the instrument to the 200 V range Set the standard voltage generator output at 199 00 V and apply it to the instrument Adjust potentiometer VR3 so that the instrument displays 199 00 V Change the instrument to the 1000 V range Set the standard voltage generator output at 1000 0 V and apply it to the instrument Adjust potentiomet
24. a high stability premium quality type of Zener diode with temperature compensation temperature coeffi cient 10 ppm C The power source for the circuit also is regulated with reference to the Zener voltage thereby realizing a highly stable circuit 47 SECTION 2 4 1 7 Clock Signal Generator This circuit provides the reference clock signal for digital signal processing of the instrument The circuit emplovs a 100 kHz quartz erystal oscillator 4 1 8 Power Supply The instrument operates on an AC line voltage of either the 90 130 V range or the 200 260 V range Range selection can be accomplished with the line voltage selector on the rear panel of the instrument For DC supply voltages the instrument employs an IC which has an reference voltage circuit and provides regulated DC supply voltages of 45 8 V 4 9 V and 5 7 V 18 SECTION 2 5 MAINTENANCE 5 1 Removing the Casing Panels The top and bottom panels of the instrument casing can be removed by removing the screws O and 2 shown in Figure 3 2 5 2 Layout of Internal Components When the top casing cover is removed the adjustment are accessible as shown in Figure 5 1 Adjust the VR1 from the night hand side and VRO at the front panel VC2 is under the shield plate VR5 AC2V GAIN VR6 OHM2k GAIN VR7 OHM200k VR8 OHM2000k VR1 DC2V GAIN VR2 DC200mV VR3 DC200V VR4 DC1000V VC2 AC200V FREQ CHARA VR9 OZERO Figure 5 1
25. instrument at a slanted angle for ease of viewing The stand also serves as a carrying handle for the instrument SECTION 2 3 2 Explanation of Rear Panel Items Figure 3 2 O Panel fixing screw 1 This screw fixes the top panel of the instrument To remove the top panel remove this screw and push the panel slightly backward and pull up the panel Q Panel fixing screw 2 This screw fixes the bottom panel of the instrument To remove the bottom panel remove this screw and push the panel slightly backward and pull down the panel G Fuse holder 1 For l ampere midget tvpe quick blow fuse to protect against overinput when in current or resistance measurement O Fuse holder 2 For l ampere midget type fuse of the AC power input line 5 LINE VOLTAGE selector switch To select the AC line voltage range on which the instrument is ta be used The left hand position is for 90 V 130 V the right hand position is for 200 260 V SEGTION 2 Caution Before connecting the AC power cord of the instrument to an AC line receptacle make sure that this switch is set in the correct position 6 AC power cord The AC power input cord of the instrument O GND terminal To ground the instrument case to the earth 10 SECTION 2 3 3 Notes for Operation 1 The AC line voltage for this instrument is selectable between the 90 130 V range and the 200 260 V range Before connecting the AC power cord of the
26. 0 kf 19 887 19 913 20 MA 19 900 M 19 821 19 979 Calibration devices Standard resistors accuracy 0 005 or better 23 SECTION 2 nad we BS eee lil Re EE 224 0023 1 1 3 224 0023 1 1 3 981 3133 3 19 1 ST1 310 0911 3 632 2 372 0026 215 1 7190 0023 5 8 25 S 465 0097 2 143 536 0004 6 3 13 810 0074 3 10 4 HEEN 401 0310 2805 ST ELECTRONICS GORP 1 1 3 Higashivamata Tsuzuki ku Yokohama 224 0023 Japan Tel 045 593 7570 Fax 045 593 7571 a te BRIL IIT DIREN EMEMALTUET TEL TEL TEL TEL TEL TEL TEL GIKIKUSUI 045 593 0200 045 593 7530 t 022 374 3441 15 029 255 6630 fk 0270 23 7050 TEL 042 529 3451 052 774 8600 TEL TEL 06 6933 3013 f 092 771 7951 fk 0555 83 2121
27. 000 V 1000 V 995 0 1005 0 RRM EEA 0 02 5 3 19000mA 400Hz 188 66 191 34 10000 A 99 3 0 1007 0 0 05 B5 4 l 200 Q 199 00 Q 198 87 199 13 19900kO 19 887 19 913 20MQ 19 90 0MO 19 821 19 979 5 5 SECTION 2 OPERATION MANUAL FOR DIGITAL MULTIMETER MODEL DME1400 KIKUSUI ELECTRONICS CORPORATTON SECTION 2 On Power Supply Source it is requested to replace the related places in the instruction manual with the following items Please apply the item of mark Power Supply Voltage LO ie naren VAC O Line Fuse tO E E ans A C Power Cable to 3 core cable See Fig 1 for the colors blue White brown black or green yellow GND green GND Fig 1 Please be advised beforehand that the above matter may cause some alteration against explanation or circuit diagram in the instruction manual AC Plug In case of the Line Voltage 125V AC or more AC Plug is in g 8 g principle taken off and delivered in view of the safety AC Plug on 3 core cable is taken off in regardless of input voltages Before using the instrument it is requested to fix a suitable plug for the voltage used SECTION 2 TABLE OF CONTENTS PAGE GENERAT Gerekend ER TA 1 SPECIFICATIONS wo cee cece eeen wer
28. If the measured value is less than 1800 counts underrange the buzzer sounds continuously Vor A mode If the measured value is 20000 counts or over overrange the buzzer generates consecutive pips If the button is in the undepressed state the buzzer remains idle 6 Q ZERO adjustment potentiometer This potentiometer is used to adjust the measuring circuit to balance out the resistance of the test leadwires when in the ohmmeter mode This adjustment is effective on the 2000 and 2k ranges Normally short the ends of the test leadwires and adjust this potentiometer so that the reading becomes 00 00 Q SECTION 2 Input terminals These terminals are for the input signal to be measured Connect the test leadwires to these terminals 4 terminal The side of the input circuit 11 ti tt od terminal The side of the input circuit Although this terminal is connected to the circuit ground reference potential it is floated from the casing and it can be used for floating voltage measurement In this case the voltage rating with respect to the case ground is 500 V DC or 500 Vrms AC Displav Unit The displav unit emplovs an LCD readout of 4 1 2 digits and displays 0000 to 19999 It also displays the type of signal AC DC unit of measure mV V mA A fi kM MQ the decimal point and the sign if the measured DC voltage or current is negative 9 Stand The stand may be used to place the
29. ON 2 20 001 clock pulses Each of the conversion cycles is fixed at 40 002 clock pulses For a signal which is smaller than one conversion cycle the remaining period of reverse integration for the reference voltage is used for the auto zero period The clock signal generator employs a 100 kHz crystal oscillator thereby providing accurate 100 msec sampling periods and improving the noise rejection ratio 4 1 5 Range Selector Circuit The instrument employs a CMOS LSI for range control Range selection can be done either manually or automatically The maximum value displayed by the readout is 19999 counts When in the AUTO mode the measur ing range is automatically changed to the upper one if the measured value is 20000 counts or over or it is automatically changed to the lower one if the measured value is less than 1800 counts When in the MANU mode the measuring ranges are selectable by pressing the UP and DOWN buttons The LSI also has an LCD driver circuit to display the selected function range unit of measure decimal point and other conditions of measure ment and a buzzer driver circuit which generates an audible signal as an overrange alarm when the measured voltage or current value has exceeded the maximum display value or as an acceptance signal when the object tested in the ohmmeter mode has indicated that the object has electrical continuity 4 1 6 Reference Voltage Circuit The reference voltage circuit employs
30. asured object If the buzzer sounds the tested object has an electrical continuity if the buzzer does not sound the tested object has no electrical conti nuity or has a high resistance The buzzer sounds when the dis played value is less than 1800 counts ma ee SECTION 2 4 OPERATING PRINCIPLE 4 1 Outline of the Measuring Principle Model DME1400 Digital Multimeter basically is a DC voltmeter See the block diagram of Figure 4 1 For AC voltage measurement and resistance measurement the input signal is converted into a DC signal For current measurement the current to be measured is fed through a resistor and the voltage drop across the resistor is measured For AC voltage and current measurement the input signal is converted into a DC voltage by an AC DC converter For resistance measurement a con stant current is fed through the resistor to be measured and the voltage developed across it is measured LCD LCD DRIVER 1 VOLTAGE DIVIDER AC DC CON VERTER CURRENT SHUNT INPUT I A SIGNAL SELECTOR CONVERTER REFERENCE VOLTAGE CRYSTAL OSCILLA TOR 100kHz g ANALOG oS AC LINE VOLTAGE SELECTOR DRIVER f BUZZER L DRIVER DIGITAL Figure 4 1 Block Diagram of the Multimeter JA SECTION 2 4 1 1 Voltage Divider and Current Shunt Vin 10M A D The A D converter may be damaged if a a l CONVERTER hig
31. de als Per raj 2 OPERATION METHOD ich caste ee ORN 6 3 1 Explanation of Front Panel Items serene 6 3 2 Explanation of Rear Panel Items 000 olene l 9 3 3 Notes for Operation oe 11 3 4 Preparation for Measurement eneen paints 12 3 5 Measuring Procedures ccccuecacee PO NE 12 OPERATING PRINCIPLE de NN raus Al 4 1 Outline of the Measuring Principle Re eee 15 MATIN TENANCE sac sie eb dan ee venete 19 5 1 Removing the Casing Panels vossen es seat 19 9 2 Layout of Internal Components ee 19 rd OAESDEAETON teres NN I LS Suen le oe 20 SECTION 2 1 GENERAL Model DME1400 Digital Multimeter is a multi purpose digital meter which measures DC and AC voltages and currents and resistance The measuring sensitivity is high and the measuring ranges are wide Namely the instrument measures DC and AC voltages 10 uV 1000 V DC and AC currents 0 01 HA 1 A and resistance 0 01 Q 20 MQ Measuring range selection can be made either manuallv or automaticallv In the latter case the instrument automatically selects an optimal mea suring range for the signal being measured The measured value is displayed by an LCD readout The readout is with 4 1 2 digits and the maximum display value is 19999 The display section has also a hold function that the value measured at a certain required instant is displayed continuously at the fixed value The resistance measuring mode can be utiliz
32. ed for simplified test of diodes The instrument has a buzzer to generate an audible signal greatly facili tating electrical continuity test of devices and components The instrument employs a double integration system for highly stable and accurate measurement Utilizing unique LSI and incorporating advanced technology the multimeter provides high operation reliability while it is compact and a low power consumption type of instrument SEGTION 2 2 SPECIFICATIONS Instrument name Digital Multimeter Model number DME1400 Measuring functions DC voltage AC voltage DC current AC current and resistance Display section Indication Field effect liquid crystal display LCD Maximum display value 4 1 2 digits 19999 wou Polarity indication sign alone is indicated Overrange indication Blinking of mark Type of voltage or current AC or DC Unit of measure mV V mA A 2 kQ or MQ DC Voltage Measurement mls 200 mv 0 04 of reading Resolution 10 uv 0 02 of range gt 10 Q 0 03 of reading 100 uv 0 01 of range 0 04 of reading 1 mV 0 02 of range 200 V 0 04 of reading 10 mV Approx 0 01 of range 10 MQ 1000 V 0 06 of reading 100 mV 0 02 of range Range selection Automatic or manual 23 C 5 C 73 F 99F RH lt 80 Maximum allowable input voltage Input resistance 1100 V 10 sec 500 V continuous
33. ement 200 V protected with fuse a is SECTION 2 3 4 Preparation for Measurement 1 2 3 4 5 6 Check that the POWER switch on the front panel is OFF Check that the AC LINE VOLTAGE selector switch on the rear panel is set in the correct position conforming with the AC line voltage on which the instrument is to be operated Connect the AC power cord to the AC line outlet Do not operate the instrument in a place where ambient temperature changes sharply Turn on the POWER switch of the instrument The instrument is ready for measurement If higher measuring accuracy is needed warm up the instrument for 30 minutes or over gt If the meter indication is unstable change the inserting direction of the power cord plug in the AC line outlet interchange the pin positions of the plug when mating it with the outlet receptacle 3 5 Measuring Procedures 3 5 1 1 2 3 4 DC Voltage Measurement Set the AC DC button of the FUNCTION selector in the DC state undepressed state and depress and lock the V button Select the required range with the RANGE selector If the level of the v ltage to be measured is unpredictable set at first the instrument in the highest range and then manually lower the ranges or set the instrument in the AUTO mode Connect the test leadwires to the input terminals Normally connect the red leadwire to the input terminal and the b
34. er VR1 VER9 VC2 VR5 AC2V GAIN VR6 OHM2k GAIN VR7 OHM200k VR8 OHM2000k VR1 DC2V GAIN VR2 DC200 mV VR3 DC200V VR4 DC1000V VC2 AC200V FREQ CHARA VRO ZERO 5 1 SECTION 1 53 ki iE 23 C EIC 80 C CE 5 3 1 1 2 3 4 5 5 3 2 1 2 POWER ON FUNCTION V CREL CC 2V 0 005 1 9900V CH EL C COR 19900VIC KC VR1 200mV K
35. er VR4 so that the instrument displays 1000 0 V Calibration of AC Voltage Measuring Function Set the FUNCTION selector to the AC and V state and select the 2V range Using a standard DC voltage generator accuracy 0 05 or better apply an input voltage of 1 9900 V 400 Hz to the instrument Adjust potentiometer VR5 so that the instrument displays 1 9900 V 20 49 SEGTION 2 2 Change the instrument to the 200V range Set the standard voltage generator at 199 00 V 1 kHz and apply it to the instrument Adjust VC2 so that the instrument displays 199 00 V 5 3 3 Calibration of Resistance Measuring Function The instrument is capable of a wide range of resistance measurement covering from low resistances to high resistances In low resistance measurement the resistance of the test leadwires may become not negli gible in high resistance measurement external induction noise picked up by the test leadwires may cause errors To prevent such causes of inaccuracies in resistance measurement use short and heavy test lead wires shielded wires preferably 1 Set the FUNCTION selector to the OHM state set the range at 2002 and short the input terminal Adjust the 2 ZERO potentiometer on the front panel so that the instrument displays 00 00 2 2 Change the instrument to the 2k range and connect a standard resistor of 1 9900 kQ between the input terminals Adjust potentio meter VR6 so that the instrument displays 1
36. g 0 02 of range 0 1 of reading 0 05 of range 0 3 of reading 0 1 of range Compliance voltage 5 V or less Zero adjustment The resistance of the leadwires connected to the input terminals can be balanced out by adjusting the Q ZERO potentiometer SECTION 2 Diode check function Forward voltage of diode can be measured with 2kfi range of resistance measurement Ip 1 mA Maximum compliance voltage 2 V Buzzer When in voltage or Consecutive pips if 20000 counts or over current measurement overrange AC DC When in resistance Continuous peep if less than 1800 counts measurement undercount General Specifications Measuring svstem Double integration svstem Measuring speed 2 5 samples sec Holding of measured value Can be held Operating ambient temperature 0 C to 40 C 30 F to 104 F Storing ambient termperature 20 C to 60 C 4 F to 140 F AC line voltage 90 130 V or 200 260 V selectable with switch on rear panel 50 60 Hz AC Power consumption Approx 1 3 VA with 100 V AC 50 Hz Dimensions 180 W x 60 H x 150 D mm 7 07 W x 2 36 H x 5 91 D in Maximum dimensions 195 W x 70 H x 170 D mm 7 68 W x 2 76 H x 6 69 D in Weight Approx 1 3 kg 2 9 lbs Accessories Operation manual 1 Test readwires l pair Fuse 0 1 A 1 Fuse 1 A l SECTION 2 3 OPERATION METHOD 3 1 Explanation of Front Panel Items Figure 3 1
37. h voltage is directly applied to its SM1 input circuit To protect the 4 D converter the input voltage is reduced 101k 10 01k into a low voltage signal by the voltage divider Switches Sl and S2 are dictated SW2 bv the AUTO RANGE control circuit The current is fed through a l ohm resistor shunt resistor and the voltage developed Figure 4 2 Current shunt across the resistor is fed to the A D converter 4 1 2 AC DC Converter The AC DC converter of the instrument employs a mean value rectification effective value indication system It consists of an impedance conver ter a rectifier and an amplifier It converts the AC input signal into a DC output signal with good linearitv 4 1 3 Ohm Converter For resistance measurement the instrument employs a constant current system with operational amplifier It feeds a constant current to the object to be measured and determines the voltage drop developed across the object 4 1 4 A D Converter The A D converter employs a double integration system which provides high resolution and high accuracy being less affected by ambient temperature change and external noise It is structured with a COMS and consumes very less power o System Timing The A D converter employs three conversion cycle periods Auto zero period 10 001 30 002 clock pulses signal integration period 10 000 clock pulses and reference voltage reverse integration period 0 dy 16 22 Er SECTI
38. instrument to an AC line outlet make sure that the LINE VOLTAGE switch is set in the correct position for the AC line voltage 2 The plug of the power cord of the standard instrument is with 125 V AC rating To operate the instrument on a 200 260 V AC power line replace the plug with a one which has a corresponding rating 3 The measuring input terminals are isolated from the instrument casing Although the maximum measuring input voltage is 1000 V DC or 1000 ti Vrms AC the voltage rating of the GND input terminal with respect to the casing earth potential is 500 V DC or 500 Vrms AC Pay attention to this when measuring a high voltage 4 When measuring resistances with low ranges to eliminate the resis tance of the test leadwires from being introduced as errors into the measured values short the measuring ends of the test leadwires and make zero adjustment with the ZERO adjustment potentiometer 5 The maximum allowable input voltages and currents for respective ranges of the instrument are as shown below Be careful not to applv or feed voltages or currents larger than these limits DC voltage 200mV 2V ranges 500 V continuous 1100 V within 10 sec 20V 1000V ranges 1100 V 9continuous AC voltage 200mV 2V ranges 500 Vrms continuous 1000 Vrms within 10 sec 20V 1000V ranges 1000 Vrms continuous DC current 41 1 A protected with fuse AC current 1 1 A protected with fuse Resistance measur
39. lack leadwire to the terminal Apply the other ends of the leadwires to the points where the voltage is to be measured Read the voltage displayed tub JE ie SECTION 2 3 5 2 DC Current Measurement 1 Set the FUNCTION selector to the DC and state Select the required range with the RANGE selector 2 Connect the multimeter in series to the measured line using the test leadwires and read the displayed valve 3 5 3 AC Voltage Measurement 1 Set the AC DC button of the FUNCTION selector to the AC state depressed state Set the V switch of the FUNCTION selector also to the depressed state 2 Select the required range with the RANGE selector If the level of the voltage to be measured is unpredictable set at first the instrument in the highest range and then manuallv lower the ranges or set the instrument in the AUTO mode 3 Apply the voltage to be measured to the instrument using the test leadwires and read the displaved voltage 3 5 4 AC Current Measurement 1 Set the FUNCTION switch to the AC and A state Select the required range with the RANGE selector 2 Connect the multimeter in series to the measured line using the test leadwires and read the displayed value 3 5 5 Resistance Measurement 1 Depress and lock the Q button of the FUNCTION selector 2 Depress and lock the MANU AUTO button of the RANGE selector and press the DOWN button several times so that the 2002 range is
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