Declaration of Conformity
Contents
1. Display measurement value percentage 1 Under the Compare mode press SHIFT and VALUE in sequence to select resistance value which is based on actual value or normal value to calculate the percentage and displays it on the panel Normal value 20 000 Actual value 10 000 Percentage 050 00 16 GOM 802 DC MILLI OHM METER USER MANUAL 2 Enable the measurement value percentage calculation and the auto range function will be annulled 3 REL FUNCTION 1 Use this function to do zero adjustment when the test lead or the resistance of the DUT needs to be adjusted 2 Pre set a reference value then every value must minus the reference value before displaying on the panel for the compare judgment 3 Under the compare mode enable REL function the auto range function will be annulled 4 After calculation if the value is negative the minus symbol and the number will be displayed alternately on the position of MSD most significant digit under low converted speed mode 7 times second while only the minus symbol will be displayed on the position of MSD under high converted speed mode 6 2 Temperature measurement 1 Temperature measurement 1 2 3 4 Connect an optional temperature probe to the rear panel Press SHIFT and TEMP in sequence getting into main function selection mode Press A V can switch over 3 kinds of functions of ohm and TC2. RELAY Control the relay signal and series signal output PASS Indicate PASS signal and series signal output LOW Indicate LOW signal and series signal output HIGH Indicate HIGH signal and series signal output CLOCK When every group of output signal including READY PASS LOW HIGH is ready a CLOCK signal will be sent out There are 100 groups of output signals totally STRB After all 100 groups of output signals have been ready a STRB signal will be sent out 802 DC MILLI OHM METER USER MANUAL 2 SCAN Operation O Set to SCAN mode from the resistance measurement mode first enable the compare function and change the range manually then press SHIFT and SCAN in sequence Q Set sweep count by adjusting A or W lt q or p the maximum count can be up to number 100 Press ENTER to confirm the setting or press SHIFT to cancel the setting Set one count sweep delay time up to 30000 unit maximum or 30 unit minimum unit 16 2ms by adjusting A V 4 or gt then press ENTER to confirm the setting or press SHIFT to cancel the setting When the setting is completed the message of READY will be displayed on the measurement value displayed area Now the setting of range and up down limit of the compare function can not be changed Proceed sweep function by press MANUAL TRIG and the result will be output through SCAN interface Press SHIFT and SCAN in
3. GOM 802 DC MILLI OHM METER USER MANUAL 3 PRECAUTIONS BEFORE OPERATION 3 1 Unpacking the Instrument The product has been fully inspected and tested before shipping from the factory Upon receiving the instrument please unpack and inspect it to check if there is any damage caused during transportation If any sign of damage is found notify the bearer and or the dealer immediately 3 2 Checking the Line Voltage The product can be applied by any kind of line voltages shown in the table below Before connecting the power plug to an AC line outlet make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage It might be damaged the instrument by connecting to the wrong AC line voltage WARNING To avoid electrical shock the power cord protective N grounding conductor must be connected to ground When line voltages are changed replace the required fuses shown as below Line Line voltage voltage 100V 90 110V TTO 3A 220V 198 242V TO 25A 120V 108 132V 250V 230V 216 250 250V GOM 802 WARNING To avoid personal injury disconnect the power cord before removing the fuse holder 802 DC MILLI OHM METER GOM 802 DC MILLI OHM METER USER MANUAL USER MANUAL 4 PANEL INTRODUCTION Figure 4 2 Rear Panel Figure 4 1 Front Panel GOM 802 DC MILLI OHM METER USER MANUAL 4 1 Front P
4. 006 0 100 1 385 138 5Q 4 Temperature Sensor Terminals Source Sense Source Sense GOM 802 DC MILLI OHM METER USER MANUAL 8 MAINTENANCE Qualified personnel execute the following instructions only To avoid electrical shock do not perform any servicing other than the operating instructions unless you are qualified to do so 8 1 Line fuse replacement If the fuse blows the meter 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 TT0 3A 250V 220 230V T0 25A 250V F101 on PCB T6 3A 250V WARNING For continued fire protection replace only N with 250V fuse of the specified type and rating and disconnect the power cord before proceeding fuse replacement 8 2 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 the unit was factory set To convert to a different line voltage perform the following procedure 802 DC MILLI OHM METER USER MANUAL 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
5. 4 General Function osenonnoneoeoeononnoneoeoeononn ones eo eon 19 7 MEASUREMENT TECHNIQUES 26 7 1 4 wire 26 7 2 Temperature 28 8 MAINTENANCE ded doses 31 8 1 Line fuse 31 8 2 Line voltage 31 8 3 Cleaning eo resa e Seanad EE des ose 32 802 DC MILLI OHM METER USER MANUAL SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product WARNING Warning statements identify condition or practices that could result in injury or loss of life practices that could result in damage to this product or CAUTION Caution statements identify conditions or other property N WARNING This equipment is not for measurements performed for CAT Il Ill and IV The following symbols may appear in this manual or on the product A A 4 DANGER ATTENTION Protective Earth ground High Voltage referto Manual Conductor Terminal Terminal d GOM 802 DC MILLI OHM METER 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 colored in accordance with the following cod
6. 802 DC MILLI OHM METER USER MANUAL The recall function for the compare setting 1 5 Under Compare function set the high and low limit percentage of normal value according to the setting procedure of Normal value High limit percentage and low limit percentage Press SHIFT and RECALL in sequence getting into save and recall function of Compare setting Switch to recall function by pressing A or W and the CALL message will be displayed on the panel press ENTER to confirm the setting or press SHIFT to clear the setting Among the message MXX displayed on the panel XX means the number of the recall group from 00 to 19 Use A or W lt or gt to adjust the recall location the panel will display the normal value and the up down limit percentage of normal value After recall setting the HI LO GO judgment is according to the new setting value The Buzzer function setting 1 2 3 Under the Compare mode press SHIFT and in sequence getting into buzzer setting The panel will display the present setting status the message NON means no action bP means the buzzer is activated when the test is pass and means the buzzer is activated when the test is failed Use A or W to select NON bP or bF then ENTER to confirm the setting or press SHIFT to clear the setting The buzzer will be disabled once leave the Compare mode
7. LOW to turn on off the down limit percentage setting function and press SHIFT to clear the setting After setting the maximum number displayed on the up down limit percentage area will be flashing adjust the value by using and V and move the flashing number by using 4 or gt then press ENTER to confirm the correct value The maximum down limit percentage value is set at 999 while the minimum down limit percentage value is set at 000 After setting the HI LO GO judgment is according to the new setting value If the setting is not saved once leave the setting function and re power on the setting will be cleared The save function for the compare setting 1 2 4 Under Compare function set the high and low limit percentage of normal value according to the setting procedure of Normal value High limit percentage and low limit percentage Press SHIFT and RECALL in sequence getting into save and recall function of Compare setting Switch to save function by pressing A or W and the SAVE message will be displayed on the panel press ENTER to confirm the setting or press SHIFT to clear the setting Among the message S MXX displayed on the panel XX means the number of the storage group from 00 to 19 Use A or V lt q or gt to adjust the save location then press ENTER to replace the previous save location or press SHIFT to clear the setting 5 GOM
8. USER MANUAL Four wire measurement method Auto recall last setting on re power on Diode test Alarm setting for PASS FAIL test result Sampling rate 7 or 30 sampling sec Standard interface Scan Handler optional interface RS 232 GPIB 802 DC MILLI OHM METER USER MANUAL 2 SPECIFICATIONS The specifications are operated under the essential conditions as follows A 1 year calibration cycle accuracy An operating temperature of 18 to 28 C 64 4 to 82 4 F Relative humidity not exceeding 80 Accuracy is expressed as percentage of reading digits The instrument requires 30 minutes warm up time to achieve rated GOM 802 DC MILLI OHM METER USER MANUAL Measurement Four terminal method Auto ranging Provided Over input range OL indication 30m 3Q range 30VpDC Maxi Applied volt M Other range 100VpDC Comparator 20 sets of comparator status can be selected Buzzer mode switchable NON PASS FAIL 2 Temperature Measurement 1 Resistance Measurement T Platinum resistor emperature sensor option P Lead length 1 5m approx 30000 counts speed 7 times second Ranse Accuracy Accuracy 5 Speed 7 times second Speed 30 times second 9 9 C 39 9C 0 3 0 5 C 0 3 2 C 50 0 C 10 0 C o 1 40 C 100 C 0 3 1 0 C 0 3 3 3 Temperature Correc
9. line voltage may also require a corresponding change of fuse value Install the correct fuse value as listed on rear panel 8 3 Cleaning To keep the instrument clean wipe the case with a damp cloth and detergent Do not use abrasives or solvents ee ye
10. sequence to leave SCAN mode After sweep the measurement results can be observed by adjusting A or V Please refer to the procedure of SCAN interface output as follows GOM 802 DC MILLI OHM METER USER MANUAL Step 1 After the SCAN setting the message of READY will be displayed on the panel SCAN interface starts output RELAY PASS LOW HIGH CLOCK UILTLTLI WUL STRB uw L Step 2 Press MANUAL TRIG to start scan RELAY L w Peni PASS Ff ee LOW E eene Jf HIGH A I CLOCK OI y JU f JL 1 1 2 99 100 STRB p 93 802 DC MILLI OHM METER USER MANUAL Step 3 Scan channel one the sweep delay time is up RELAY um CE IL PASS Cries jj m LOW ts ai fp HIGH Conc duis i ao ape iL STRB a RELAY ct ly PASS OOO IKO ff LOW OOO KO HIGH DODDO CLOCK U alas JE JL pall STRB fff L OA GOM 802 DC MILLI OHM METER USER MANUAL Step 5 Scan channel 100 the sweep delay time is up RELAY PASS OOO ED HRK Da Low OO HIGH DODO ie KOS f 1 STRB The account of output time for SCAN interface Data r7i 1 Tr Ly L 128 us 3205 STRB ee E 20 us 25 GOM 802 DC MILLI OHM METER GOM 802 DC MILLI OHM METER USER MANUAL USER MANUAL 7 MEASUREMENT TECHNIQU
11. the wire and material can not be guaranteed use REL function for zeroing adjustment m 97 802 DC MILLI OHM METER USER MANUAL 7 2 Temperature measurement 1 Reference temperature The international Temperature Scale ITS is based on the following table 7 1 which was revised in 1990 with seventeen fixed points and corresponding temperatures Table 7 1 Temperature Element Type K Hydrogen 13 8033 259 3467 Ne Neon Tipple point 24 5561 248 5939 05 Oxygen 54 3584 218 7916 Ar Argon 83 8058 189 3442 Hg Mercury Tripple point 234 325 38 8344 HO Water Tripple point 273 16 0 01 Ga Gallium Melting point 302 9146 29 7646 In Indium Freezing point 429 7485 156 5985 Sn Tin 505 078 231 928 Zn Zinc 692 677 419 527 Al Aluminum Freezing point 933 473 660 323 Ag Silver 1234 93 961 78 Au Gold 1337 33 1064 18 Note 1 Temperature unit Thermodynamic temperature T Kelvin K 2 Temperature scale Celsius scale C Rankinescale R Kelvin F C 25 9 F 32 K C 273 15 R F 459 67 8 GOM 802 DC MILLI OHM METER USER MANUAL 2 Temperature measurement sensor The common usage for the resistance temperature detectors RTD is to convert temperature into electro signal Please refer to following table 7 2 of its feature Table 7 2 Feature Description 1 Accuracy Higher accuracy 2 Resolu
12. 2 DC MILLI OHM METER USER MANUAL 1 PRODUCT INTRODUCTION 1 1 Description GOM 802 is a high precision programmable DC Milli ohm meter suitable for the low resistance measurements of switches relays connectors PCB tracks and variety of other devices With the easy to use features superior performance and automatic test interfaces described as below GOM 802 is obviously a reliable and handy instrument for the low resistance measurements Easy to use features Utilizing the arrow key for setting the percentage of upper and lower limit based on the normal value can make it easier to execute the HI LO GO comparator function Besides through the Alarm Buzzer setting can indicate the PASS FAIL status and all kinds of output status can be indicated through Handler Interface output The RELATIVE feature that enables GOM 802 to remove the stray resistance easily and the 20 sets of Normal Hi Lo setting memories can satisfy with different kind of test condition Also the last setting will be recalled every time when the GOM 802 is turned on Superior Performance There are nine measurement ranges from 30m to 3M selected automatically or manually with the constant current between 1 44 and 1A 0 05 high accuracy 14 resolution and four terminals Kelvin connection to make a reliable and consistent test result The flexible choice for a high measurement accuracy at speed of 7 sampling sec full scale at 30000 or a less me
13. 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 New District Jiangsu China declare that the below mentioned product GOM 802 is 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 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 following standards were applied EMC EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements 1997 1 1998 Conducted and Radiated Emission Electrostatic Discharge EN 55011 1998 class B IEC 61000 4 2 1995 A1 1998 Current Harmonic Radiated Immunity 61000 3 2 2000 IEC 61000 4 3 1996 A1 1998 Voltage Fluctuation Electrical Fast Transients IEC 61000 3 3 1995 IEC 61000 4 4 1995 Surge Immunity IEC 61000 4 5 1995 Conducted Susceptibility IEC 61000 4 6 1996 Power Freguency Magnetic Field IEC 61000 4 8 1993 Voltage Dips Interrupts IEC 61000 4 11 1994 Safety Low Voltage Equipment Directive 73 23 EEC amp amended by 93 68 EEC IEC EN 61010 1 2001 GOM 802 DC MILLI OHM METER U
14. ES 7 1 4 wire measurement b T en I 1 The 4 wire measurement can eliminate wire resistance and get accurate ped uu R resistance Please refer to the wiring method as Figure 7 1 SOURCE M 2 SR Ohm Meter C Sense HS Figure 7 2 2 4 wire measurement The 4 wire measurement takes advantage of the high input resistance characteristic of the voltmeter that there is no voltage 4 Source LF drop on r3 and r4 as no current getting through these resistances d Therefore the voltmeter can measure the voltage precisely on the n Sense LS resistance Figure 7 1 The measuring result is R ri Note 1 Before testing make sure that the KELVIN clip is well connected with the DUT r3 1d I 2 The terminals of HF Source HI LF Source LO HS Sense HI and LS Sense LO must be connected to front panel ai VOLTMETER Riv terminals properly SOURCE r4 2 Principle Ohm Meter r2 1 The traditional 2 wire measurement result combines the test lead resistance Please refer to Figure 7 2 for the measurement result Tige ved X 2 r1 R r2 3 Zeroing The clip of test lead includes Source HF Source LF Sense HS Sense LS terminals Before zeroing test make sure that the clip of Sense is next to Sense for accurate zeroing test When the quality of
15. ORMAL button to turn on off the function of normal value setting When the normal value setting is enabled the maximum number displayed on the normal value area will be flashing adjust the value by using A and V and move the flashing number by using f or 44 1 then press ENTER to confirm the correct value The maximum normal value is set at 33000 while the minimum normal value is set at 00000 After setting the HI LO GO judgment is according to the new setting value If the setting is not saved once jump out the setting function and re power on the setting will be cleared High limit percentage setting 1 4 Under the compare function press HIGH to turn on off the up limit percentage setting function and press SHIFT to clear the setting After setting the maximum number displayed on the up limit percentage area will be flashing adjust the value by using and V and move the flashing number by using 4 or then press ENTER to confirm the correct value The maximum up limit percentage value is set at 999 while the minimum up limit percentage value is set at 000 After setting the HI LO GO judgment is according to the new setting value If the setting is not saved once leave the setting function and re power on the setting will be cleared 14 GOM 802 DC MILLI OHM METER USER MANUAL Low limit percentage setting D 4 Under the compare function press
16. SER MANUAL CONTENTS PAGE 1 PRODUCT INTRODUCT ION eee creen neenon eneenenat o UN ID Description e E n06 1 1 2 Key Feature ccccecscsccsccsceccccccsccscccscccescesessesseceeesess 2 2 SPECIFICATIONS disse TT Seen 14 3 PRECAUTIONS BEFORE 7 3 1 Unpacking the Instrument eee eee eene tte 7 3 2 Checking the Line 7 4 PANEL INTRODUCTION PIC S vede 8 4 1 Front e e ne ne esaesa he 10 4 2 Rear 10 5 OPERATION ene 11 5 1 The SHIFT key and function 11 5 2 iui 11 5 3 Over range indicator eee eese eese eene nnns 11 5 4 TRIG standby indication eee 11 5 5 Input overload protection eee eee eee eee 11 5 6 Interface Operation ccce eese eene tnnt 12 5 7 Installation and Operation eee eene 12 6 MEASUREMENT INSTRUCTION Tore 13 6 1 Resistance measurement cc cesses eese eene nennen 13 6 2 Temperature measurement cesses eese eee eene enne nn 17 6 3 Temperature Compensation 18 6
17. andby status The decimal is represented the range When proceeding the TRIG measurement the measurement displayed area will display the present measuring value 4 Handler interface The handler interface provides a TTL input START 6 TTL outputs including LOW HIGH FAIL PASS EOT and READY This function is valid only under the resistance measurement mode and the compare mode is enabled 9 PIN D SHELL FEMALE READY EOT LOW HIGH START Start trigger and proceed one time measurement negative edge trigger READY Output 1 to GND means the measurement is completed and can proceed next trigger EOT Output 1 to GND means the AD convert procedure is completed can change the DUT LOW Output 1 to GND means the judgment of the compare function is low HIGH Output 1 to GND means the judgment of the compare function is high 20 GOM 802 DC MILLI OHM METER USER MANUAL FAIL Output 1 to GND means the judgment of the compare function is High or low PASS Output 1 to GND means the judgment of the compare function is GO The output current from all output collector and 5V terminal can not exceed 60mA 5 Interface setting Please refer to the programmable manual 6 SCAN interface 1 The scan interface provides 6 TTL outputs including READY PASS LOW HIGH FAIL CLOCK and STRB 9 PIN D SHELL FEMALE RELAY PASS STRB CLOCK
18. anel Interface Indicator Normal value displayed area Comparator indicator Upper limit percentage display area Low limit percentage display area Measurement value displayed area Functions control indicator Measurement terminal Sense HI Sense LO 00 10 FW NY Current source terminal Source HI Source LO The negative measurement terminal has the same potential as the circuit earth terminal but can not be replaced by it 11 Function Control knob WARNING This equipment is not for measurements performed for CAT II III and IV 4 2 Rear Panel 12 GPIB Interface terminal 13 RS232 Interface terminal 14 Handler and SCAN interface terminal 15 Temperature compensation probe terminal TC SENSOR 16 Line voltage selector and input fuse holder 17 AC Power line connector 10 GOM 802 DC MILLI OHM METER USER MANUAL 5 OPERATION INTRODUCTION 5 1 5 2 5 3 5 4 5 5 The SHIFT key and function keys The 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 Warm up The instrument requires half an hour warm up to achieve rated accuracy Over range indication If the input exceeds the full scale of the selected
19. asurement accuracy at speed of 30 sampling sec full scale at 3000 can match with the speed requirement of test 802 DC MILLI OHM METER USER MANUAL Temperature Compensation Option The optional temperature probe PT 100 can control the measuring resistance to meet the required temperature When the temperature coefficient and required temperature is keyed in under TC mode GOM 802 will display the measuring resistance corresponding to the required temperature Automatic Test For automatic system applications the GOM 802 provides a handler interface that can indicate the output status on PASS FAIL HI LO READY or EOT and control signal of measurement trigger An optional RS 232 GPIB is also available for the computer control application Application Production testing for contact resistance of switches relays connectors cables and printed circuit boards and other low resistance devices Component testing of resistors motors fuses heating elements Incoming inspection and quality assurance testing Conductivity evaluation for product design 1 2 Key Feature 30 000 counts Measurement Range 30m 2 3M Q 0 05 high accuracy Hi Lo comparator and limit percentage setting with 20 memory sets Measurement of REL Actual and value Manual or Auto ranging Continuous or Trigger measurement mode Temperature compensation and measurement uc TO GOM 802 DC MILLI OHM METER
20. e Green Yellow Earth Blue Neutral Brown Live Phase As the colors of the wires in main leads may not correspond with the colors marking identified in your plug appliance proceed as follows The wire which is colored Green amp Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol or colored Green or Green amp Yellow The wire which is colored Blue must be connected to the terminal which is marked with the letter N or colored Blue or Black The wire which is colored Brown must be connected to the terminal marked with the letter L or P or colored Brown or Red If in doubt consult the instructions provided with the equipment or contact the supplier iii 802 DC MILLI OHM METER USER MANUAL 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 75mn should be protected by a or 5A fuse Larger conductors would normally require 13A types depending on the connection method used Any mounded 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 V GOM 80
21. ng start from the high resistor value range to the low until the right value can be read out GOM 802 DC MILLI OHM METER USER MANUAL 6 MEASUREMENT INSTRUCTION 6 1 Resistance measurement 1 Resistance measurement function 1 2 3 4 Get into resistance measurement function by pressing SHIFT and TEMP in sequence to select main function mode Press or can switch over the function and 3 kinds of 39 66 measurements ohm and TC will be displayed on the panel Press ohm and ENTER to get into resistance measurement mode Use A Jor W to switch to adequate range or press AUT MAN for Auto range measurement 2 Compare function Compare function 1 2 3 Enable or disable the Compare function by pressing COMP button Make HI GO LO judgment shown on the panel indicator according to the setting of the upper and low normal value percentage When the Compare function is relieved the setting for and REL will be relieved too Example Normal value 100 00 up limit 10 0 up limit value 110 00 down limit 20 0 down limit value 80 00 The indicators of GO HI and LO will be lighted up according to the resistance value of DUT 109 00 GO indicator lights up 120 00 HI indicator lights up 70 00 LO indicator lights up Normal value setting 81305 GOM 802 DC MILLI OHM METER USER MANUAL 4 Under Compare function press N
22. on the panel Select C and press ENTER getting into temperature measurement mode The measuring value will be displayed on the normal value displayed area 802 DC MILLI OHM METER USER MANUAL 2 REL function Pre set a reference value then every value must minus the reference value before displaying on the panel for the compare judgment 3 Single range There is only a single range for the temperature measurement 6 3 Temperature Compensation Measurement 1 Temperature compensation measurement mode 1 The adequate resistance value of the DUT can be calculated through the environment temperature the setting coefficient of temperature of the DUT and the require observation temperature 2 Press SHIFT and TEMP in sequence getting into main function selection mode 3 Press A or V can switch over 3 kinds of functions of ohm and TC on the panel 4 Select TC and press ENTER getting into temperature compensation measurement mode 5 The up limit percentage area display the observation temperature and the setting coefficient of temperature will be displayed on the normal value displayed area 6 Use A or W lt q or to set the require observation temperature and the coefficient of temperature then press ENTER to confirm the setting or press SHIFT to clear the setting 2 Range selection Use A or W to switch over the range
23. or set AUTO MAN to auto range mode 18 GOM 802 DC MILLI OHM METER USER MANUAL 3 REL function Pre set a reference value then every value must minus the reference value before displaying on the panel for the compare judgment 6 4 General Function 1 Converted speed selection 1 Press SHIFT and SPEED in seguence to switch over the converted speed 2 Low converted speed 7 times second full scales 30000 3 High converted speed 30 times second full scale 3000 4 The converted speed function can be applied on the measurement of resistance temperature and temperature compensation 2 Auto range function 1 Press AUTO MAN to switch over auto range or manual range 2 Under the Compare mode switch over the range will annulled the previous setting of or REL function 3 The temperature measurement only has a single range 4 Under external trigger mode Auto range function is disabled 3 Trigger function 1 Press MANUAL TRIG getting into external trigger mode 2 Each time when the MANUAL TRIG button is pressed the EXT LED will be flashing once and the panel value will be updated again Press SHIFT and INT in sequence to leave Trig mode 19 GOM 802 DC MILLI OHM METER USER MANUAL 3 Under the TRIG mode change the range or power on the instrument the message will be displayed on the measurement displayed area now the instrument is in the TRIG st
24. range the instrument will indicate over range input by lighting the OL message on the display TRIG standby indication Under the TRIG mode change the range or power on the instrument the message will be displayed on the measurement displayed area now the instrument is in the TRIG standby status The decimal is represented the range When proceeding the TRIG measurement the measurement displayed area will display the present measuring value Input overload protection The maximum allowable input is shown as table 5 1 Please proceed the measurement accordingly Table 5 1 RANGE MAXIMUN INPUT 30mQ 300m 2 39 30Vp DC Other ranges 100Vp DC WARNING To avoid shock hazard and or instrument damage do not apply input potentials that exceed the input overload limits shown in table 5 1 802 DC MILLI OHM METER USER MANUAL 5 6 5 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 Installation and Operation Operate the GOM 802 in a location with a suitable environment free from dust direct exposition of sunlight and strong effect of magnetic fields If you have no idea about the resistor value before testi
25. tion 0 1 1 0 C higher resolution 3 Speed of response Slower 4 Self heating yes 5 Long term stability Good 6 Output characteristic Approx 0 4 ohm C near linear 3 Optional Platinum resistance sensor This kind of temperature probe meets the specification of German DIN43760 1968 3 wire measurement The relation between temperature and resistance can refer to the description of the Gallendarvan Dusen Equation as follows Rgrp R 1 AT BT CT T 100 Where is the calculated resistance of the RTD R is the known RTD resistance at 0 C is the temperature in A alpha I delta 100 B I alpha delta Ie 4 C I alpha beta Ie 8 The alpha beta and delta values are listed in Table 7 3 Table 7 3 Type Standard Alpha Beta Delta Qat 0 C PT 100 ITS90 0 003850 0 10863 1 49990 1000 29 802 DC MILLI OHM METER USER MANUAL Example Calculate the resistance of a PT 100 RTD at 100 C T The following Ry Qat 0 C alpha beta and delta values are used for the PT 100 RTD T 100 C Ro Qat 0 C 100Q Alpha 0 003850 Beta 0 10863 Delta 1 49990 A B and C are calculated according to above value as follows A 0 00391 B 5 77e 7 C 4 18e 12 The resistance of the RTD at 100 C R100 is then calculated as follows R jo0 Rol 1 AT BT CT T 100 100 1 0 00391 100 5 77e 7 100 4 18E 12 100 100 100 100 1 0 391 0
26. tion Function Temperature correction range 0 0 C 40 0 C Reference temperature range 0 C 99 9 C Thermal coefficient range 9999 ppm n Accuracy of temperature compensation for a 3930 ppm Cu wire speed 7 times second 0C 39 9 C 0 3 resistance measurement accuracy Range Resolution uu Accuracy Lg M 30m lu approx 0 1 6 300m 104 100mA 0 05 6 3 100 u 100mA 0 05 3 30 Im 10mA 0 05 2 300 10m ImA 0 05 2 3k 100m 100 4 A 0 05 2 30k 1 100 4 A 0 05 2 300k 10 104 A 0 05 2 4 8V 3Meg 100 luA 0 05962 3000 counts Accurac speed 30 40 C 100 C 0 6 resistance measurement accuracy When the instrument is set to 30m or 300mQ range the resistance value will be changed while connecting or disconnecting the test lead to the panel due to the different temperature between internal and external of the instrument Therefore it must wait 1 minute in order to obtain an accurate value after the test lead is connected or disconnected When use Kelvin clip to resume testing after long time ending it needs more time to wait for a stable value n high speed mode first assure that the instrument has been grounded throug power cord The temperature coefficiency for the other setting must be calculated individually according to different conditions If the temperature coefficiency or the difference between the environmental temperat
27. ure and the require temperature exceeds normal operation after compensation calculation the variation of the reading value will be tremendous GOM 802 DC MILLI OHM METER USER MANUAL 4 Interface Handler interface Signal START TTL input Signal LOW HIGH FAIL PASS EOT READY total 6 TTL outputs This function is valid only under the resistance measurement mode and the compare mode is enabled Scanner Signal READY PASS LOW HIGH CLOCK STRB total 6 TTL outputs This function is valid only under the resistance measurement mode and the compare mode is enabled RS 232 GPIB option TEEE488 1 1987 IEEE488 2 1992 and SCPI 1994 5 ENVIRONMENTAL Operation Environment Indoor use altitude up to 2000m Ambient Temperature 0 C to 40 C Relative Humidity 80 Maximum Installation category II Pollution Degree 2 Storage temperature 10 C to 70 6 GENERAL Power source AC 100V 120V 220V 230V 10 50 60Hz 27VA 22W Test Lead x 1 Instruction manual x 1 Accessories Programmable manual x 1 option Temperature sensor option x 1 Dimension 251 W x91 H x291 D m m Weigh Approx 3 kg WARNING To avoid electrical shock the power cord protective grounding conductor must be connected to ground A N CAUTION To avoid damaging the instrument do not use it in a place where ambient temperature exceeds 40
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