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Manual for 120000 Count Auto Ranging

1. 117 117 MEASure RESistance 117 MEASure FRESistance 117 117 118 MEASure CONTinuity 118 5 2 2 118 MEASure CAPacitance 118 MEASure TEM Perature TCOuple 118 MEASure2 VOLTage DC 119 2 119 MEASure2 CURRent DC 119 2 119 MEASure2 RESistance 119 MEASure2 FRESistance 120 2 120 2 120 SENSe TEMPerature TCOuple TYPE 120 SENSe TEMPerature TCOuple TYPE 120 SENSe TEMPerature RJUNction SIMulated 121 SENSe TEMPerature RJUNction SI Mulated 121 SENSe DETector
2. The Digital I O port is fe s e e eG used for outputting the SAC comparison test results Te TS Tus external triggering and as a user defined output port See page 89 Y de SIE 120 B Accepts the power cord AC 100 120 220 240V 10 50 60Hz 100 022 Ove For power on sequence see page 24 y Fuse Socket 120 Holds the main fuse on E 100 120 VAC 0 125AT 220 240 VAC 0 063AT For fuse replacement details see page 142 21 GW INSTEK GDM 8351 User Manual ae RS232 port This port is used for remote control See page 94 USB Device Port Type B USB port This port is used for remote control See page 94 D L 22 GW INSTEK GETTING STARTED Set Up Tilting the Stand From the base of the handle gently pull the handle out sideways and then rotate it to one of the following positions m 000000 j BD B CQOOOOOO S X Horizontal D position HH Tilt stand position Carry position 23 GW
3. EP e ER Ee REPRE ek 13 GDM 8351 Front 2 13 Display Overview 19 Reat Panel eta AR 21 dn 23 Tilting 23 Power 24 How to Use the 25 GW GETTING STARTED Characteristics The GDM 8351 is a portable dual display digital multimeter suitable for a wide range of applications such as production testing research and field verification Performance DCV accuracy 0 012 High current range 10A High Voltage range 1000V High ACV frequency response 100kHz Features fastest sampling rate is 320 Readings sec for ADC and PC transmission The diode test open circuit voltage is 5V 1mA 120000 count display Multiple functions ACV DCV ACI DCI 2WR 4WR Cap Freq Period Temp Continuity Diode test MAX MIN Avg REL dB dBm Hold MX B 1 X REF Compare Manual or Auto ranging AC true RMS Data logging to PC using an Excel Add In Interface USB device port supports USBCDC and USBTMC RS232 Digital I O port can used in either pass fail testing Compare function or have the output state remotely controlled Only one function at a time can be used Software Excel Addins LABVIEW driver GW INSTEK GDM 8351 User Manual
4. 121 5 121 SENSe JAVERage TCONtrol 121 5 121 5 122 5 122 SENSe JAVERage WINDOW 122 5 122 5 5 122 SENSe AVERage STATe 122 SENSe FREQuency INPutjack 123 105 GW GDM 8351 User Manual Calculate Commands Trigger Commands 106 SENSe FREQuency INPutjack 123 5 123 5 2 123 SENSe CONTinuity THReshold 123 SENSe CONTinuity THReshold 123 SENSe UNIT sss 124 SENSe UNIT eennenneees 124 SENSe FUNCtion 1 2 es 124 SENSe FUNCtion 1 2 124 125 CALCulate FUNCTION 125 5 40442210 125
5. sss 31 Automatic Manual Triggering sss 31 AC DC Voltage Measurement 32 Select the Voltage Range 33 Voltage Conversion 35 Crest Factor Table 5 ete 36 AC DC Current 37 Select the Current Range 39 Resistance 8 42 Select the Resistance 44 Diode TeSt 45 Capacitance 46 Select the Capacitance 47 Continuity TT o 48 Set Continuity Threshold 2 49 Continuity Beeper Settings 50 Frequency Period Measurement 51 Frequency Period Settings 52 Temperature 53 Set the Temperature Units 54 Select Thermocouple Type 55 28 GW INSTEK OPERATION Set the Reference Junction 56 Dua
6. 5 125 CALCulate MINimum 125 CALCulate MAXIMUM 125 CALCulate HOLD REFerence 126 126 126 CALCulate REL REFerence 126 CALCulate LI Mit 126 CALCulate LIMit LOWer 126 CALCulate LI Mit UPPer 126 222 20 127 127 CALCulate DB REFerence 127 CALCulate DBM REFerence 127 127 CALCulate 127 CALCulate MATH MMFactor 127 CALCulate 128 128 CALCulate 128 CALCulate MATH PERCent 128 READ iode rd eiit deste 129 de IU 129 ius eei USER 129 GW COMMAND OVERVIEW System Commands St
7. 97 Return to Local Control eere PER REM RR MERE 99 93 GW INSTEK GDM 8351 User Manual Configure Remote Control Interface USB Interface The USB device port on the rear panel is used for remote control The USB port can be configured as either a TMC or CDC interface When configured as a TMC interface the DMM can be controlled using National Instruments NI Visa software NI Visa version 3 0 and above supports USB TMC When configured to CDC the USB port on the DMM will appear as a virtual COM port to a connected PC Any terminal program that can communicate via a serial port can be used for remote control Before the DMM can be used for remote control using the CDC or TMC USB class install the appropriate CDC or TMC USB driver included on the User Manual CD N To use the TMC interface National Note Instruments Measurement and Automation Explorer can be used This program is available on the NI website www ni com via a search for the VISA Run time Engine page or downloads at the following URL http www ni com visa Configure USB Interface USB connector A host Configuration DMM Rear panel Type B slave connector Speed 1 1 2 0 full speed high speed USB Class TMC USB T amp M class CDC Communications device class Hardware flow Off control Data Bits 8 Stop bit 1 94 REMOTE CONTROL Steps 1 USB port 2 P
8. e I 5 Hy i 231 0 283 2 264 4 300 2 157 GW GDM 8351 User Manual Declaration of Conformity We GOOD WILL INSTRUMENT LTD No 7 1 Jhongsing Rd Tucheng Dist New Taipei City 236 Taiwan GOOD WILL INSTRUMENT SUZHOU CO LTD No 69 Lushan Road Suzhou New District Jiangsu China declare that the below mentioned product Type of Product Digital Multimeter Model Number GDM 8351 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 Conducted amp Radiated Emission EN 55011 2009 A1 2010 EMC EN 61326 1 Electrical equipment for measurement control EN 61326 2 1 and laboratory use EMC requirements 2013 Electrostatic Discharge EN 61000 4 2 2009 Current Harmonics EN 61000 3 2 2006 A1 2009 A2 2009 Radiated Immunity EN 61000 4 3 2006 A1 2008 A2 2010 Voltage Fluctuations EN 61000 3 3 2013 Electrical Fast Transients IEC 61000 4 4 2012 Surge Immunity EN 61000 4 5 2006 onducted Susceptibility 61000 4 6 2009 mo ower Frequency Magnetic Field N 61000 4 8 2010 tm d lt o
9. For the following command sets please refer to the diagram above STAT QUES EVEN STAT QUES ENAB STAT QUES ENAB ESR 145 GW INSTEK GDM 8351 User Manual Specifications The specifications apply when the DMM is warmed up for at least 30 minutes and operates in the slow rate Below are the basic conditions required to operate the DMM within specifications e Calibration Yearly Operating Temperature Specification 23 C 5 C 73 4 F 41 F Humidity lt 80 RH 75 RH for resistance measurement readings greater than 10 0 Temperature Range 0 35 C Relative Humidity 8076 RH gt 35 C Relative Humidity 7076 RH Accuracy of Reading Digits The power supply cable must be grounded to ensure accuracy All specifications are applicable to the main 150 display only General Specifications Operating Environment 0 55 C Temperature Range 0 35 C Relative Humidity lt 90 RH gt 35 C Relative Humidity lt 80 RH Indoor use only Altitude 2000 meters Pollution degree 2 Storage Conditions 40 70 C Temperature Range 0 35 C Relative Humidity 9096RH gt 35 C Relative Humidity lt 80 RH General Power Consumption Max 15VA Dimensions 107mm H X 264 4mm D X300 2mm L with bumpers 88mm H X 228mm D X276mm L without bumpers Weight Approximately 2 9 kg 146 GW INSTEK APPENDIX DC Voltage Rangel Resolution Full Scale Accuracy 10
10. Accessories Standard Part number Description Accessories 82DM 83510E 1 CD ROM User Manual Software Driver 82DM 83511M 1 Safety Instruction Sheet GTL 207 1M test leads 1x red 1x black Optional Part number Description Accessories GTL 246 1 2M USB Cable Type A Male PC to Type B Male Device GTL 205 Temperature Probe Adapter with Thermal Coupling K type GW INSTEK GETTING STARTED Appearance GDM 8351 Front Panel Power Switch Sense LO Terminal Sense HI Terminal SY VQ 4t D 1 Terminal _ COM 245 i Terminal T TPE REL wens 1 Terminal 1 25A 1000V Fuse Holder DC AC 10A Terminal Function keys Arrow keys Power Switch POWER Turns On AI or Off the main power For the power up sequence see page 24 m Ao Main Display Shows measurement results and parameters For display configuration details see page 78 brightness setting For an overview of the main display see page 19 v Q 4t Input INPUT This terminal is used for all Terminal measurements except for DC AC current measurements 13 GW INSTEK GDM 8351 User Manual COM Terminal Accepts ground COM line in all measurements The maximum withstand voltage between this terminal and earth is 500Vpk DC AC 1A Low current measur
11. ERE ERT DI DAI oH UN UN muv k i 5 m p V 2 dB m2NDCOMPSTORCLFILTRS232L ANUSBGPIBREAR Primary Display Function status icons Secondary measurement function icons Primary Measurement Displays the primary measurement Function Icons function 19 GW GDM 8351 User Manual Primary Measurement Units Displays the units for the primary measurement function Secondary Display Displays the results of the secondary measurement Secondary Measurement Units Displays the units for the secondary measurement function Secondary Measurement function icons Displays the secondary measurement function Function Status Icons Display status icons for operations functions that are not linked to the primary or secondary functions Primary Display Displays the results of the primary measurement 20 GW INSTEK GETTING STARTED Rear Panel Fuse 0 125AT Power Cord 0 063AT Socket Digital port USB Device Port RS232 Port Digital Port DIGITAL 1 0
12. repeating filter renews all the samples per reading 1st reading 2nd reading 3rd reading Sample 1 4 Sample5 8 Sample 9 12 Sample 1 2 3 4 5 6 7 8 9 10 11 12 81 GW INSTEK GDM 8351 User Manual Filter Count Filter count defines the number of samples to be averaged per reading More samples offer low noise but a longer delay between measurements Less samples offer high noise but a shorter delay between measurements Range 2 320 Filter Window The filter window defines the threshold for when the digital filter data is updated again When the AD data falls in the range between TH and TL the filter keeps processing When the AD data falls out of the range between TH and TL the filter will restart When measuring unstable signals appropriately setting the filter window can improve the measurement speed AD data Restart Filter Restart TH Threshold High TL Threshold Low Filter Window Previous data 1 window lt threshold lt previous Formula data 1 window Range 10 1 0 1 0 01 and none 82 GW INSTEK SYSTEM DISPLAY CONFIGURATION Digital Filter Type Settings Procedure 1 Press SHIFT FILTER TYPE to enter the Digital Filter Type settings menu 2 Use the Left and Right arrow keys to navigate to the filter type setting or to select the digit to be edited Use the Up and Down arrow keys to edit the selected digit or to toggle the filter type REP lt gt MOV
13. tun 140 Factory Default Settings 141 Replacing the AC Source Fuse 142 Replacing the Input Fuse 143 Status SyStelTi teer eren 145 Specification S sessies 146 Additional 151 DIMENSIONS iioi 157 Declaration of Conformity 158 INDEX qe 159 GW INSTEK SAFETY INSTRUCTIONS SAFETY INSTRUCTIONS This chapter contains important safety instructions that you must follow during operation and storage Read the following before any operation to ensure your safety and to keep the instrument in the best possible condition Safety Symbols These safety symbols may appear in this manual or on the instrument A aNg Zsenum n bf c OF Warning Identifies conditions or practices that could result in injury or loss of life Caution Identifies conditions or practices that could result in damage to the DMM or to other properties DANGER High Voltage Attention Refer to the Manual Protective Conductor Terminal Earth ground Terminal Do not dispose electronic equipment as unsorted municipal waste Please use a separate collection facility or contact the supplier from which this instrument was purchased GW GDM 8351 User Manual Safety Guidelines General Gu
14. yo 4W 143 GW INSTEK GDM 8351 User Manual 3 Replace the fuse at the end of the holder with the correct type and rating NS yo v A 4 Push the fuse holder back into the panel and turn clockwise when the fuse holder is level with the front panel 144 GW INSTEK APPENDIX Status system The diagram below is a description of the status system Questionable Data Binary Wieghts Event Register Enable Register 2 11 9 056 0 Voltage Overload 2 2 2 512 1 Current Overload Disi 29 1024 Not Used B 8 2 2048 Not Used 2 16 2 4096 2 32 23 8192 64 2 16384 Not Used 7 is NS 128 2 32768 Not Used Not Used 9 Ohms Overload totu Status Byte manai Summary Register Enable Register mit test Fal 12 Limit Test Fail HI g i3 NotUsed os METER Not Used 21 15 Not Used Questionable Data STAT QUES EVEN STAT QUES ENAB value Messape STAT QUES ENAB Standard Event Request Service Standard Event Not Used Event Register Enable Register Serial Poll SPOLL SRE value STR SRE 0 Operation Complete BIB Not Used 2 Query Error 3 Device Error 4 5 Output Buffer Execution Error Command Error Not Used 7 Power On ESR ESE value ESE
15. 135 STATus QUEStionable ENABle 135 STATus QUEStionable EVENt 135 5 1 135 SYST m LOCal eonun eteie emet 135 5 5 135 5 5 136 GW GDM 8351 User Manual Common Commands 108 CLS 136 diy H ES 136 136 ESR cusa nito adt eite ditta 136 jp p 137 OPC ous uL IRR RUE IPIE ties 137 OPC os 137 PSC C Cadets 137 P 137 neg 137 137 SRE E n 137 138 138 GW INSTEK COMMAND OVERVIEW CONFigure Commands CONFigure VOLTage DC Sets measurement to DC Voltage on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF VOLT DC 1 Sets the voltage range to 1 volt CONFigure VOLTage AC Sets measurement to AC Voltage on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF VOLT AC Sets the AC range to auto range CONFigure VOLTage DCAC Sets measurement to DC AC Voltage on the first display and specifies the range Parameter None Range lt N
16. READ count SAMP COUN 2 rounded up gt 0 10212E 01 0 00000E 00 0 10348E 01 0 00000E 00 Queries 2 counts of measurement samples from the first and second display Example2 SAMP COUN 3 USBCDC or RS232 READ Count 3 gt 0 10212E 01 0 00000E 00 0 10348E 01 0 00000E 00 0 10123E 01 0 00000E 00 Queries 3 counts of measurement samples from the first and second display VAL1 Returns the 1 display reading Example SAMP COUN 3 all remote interfaces VAL1 gt 0 10212E 01 0 10348E 01 0 10123E 01 Queries 3 counts of measurement samples from the 1 display VAL2 Returns the 2 4 display reading Example SAMP COUN 3 all remote interfaces VAL2 gt 0 10212 01 0 10348 01 0 10123E 01 Queries counts of measurement samples from 274 display 129 GW INSTEK GDM 8351 User Manual TRIGger SOURce Selects the trigger source Parameter INT EXT Example TRIG SOUR INT Sets the trigger source as internal TRIGger SOURce Returns current trigger source TRIGger AUTO Turns Trigger Auto mode on off Parameters ON OFF Example TRIG AUTO OFF Turns the Trigger Auto mode off TRIGger AUTO Returns the Trigger Auto mode Return parameter 0 1 0 1 ON SAMPle COUNt Sets the number of samples Parameter lt NR1 gt CDC 1 9999 TMC 1 320 MIN MAX Example SAMP COUN 10 Sets the number of samples to 10 SAMPle COUNt Returns the number of samples Pa
17. med gt 20Hz fast gt 200Hz Accuracy 20 Hz to 45 45 Hz to 10 kHz to 30 30 kHz to 100 Rate Range Hz 10kHz kHz kHz 100 000mV 1 200 0 3 400 1 5 800 5 1200 1 00000 1 200 0 2 400 1 400 3 800 10 0000V 1 200 0 2 400 1 400 3 800 100 000V 1 200 0 2 400 1 400 3 800 750 00V 1 200 0 2 400 1 400 3 800 100 000mV 0 396 1000 1 59 41000 5 1500 1 00000 V 0 2 500 1 500 3 1000 Fast 10 0000 V 0 2 500 1 500 3 1000 100 000 V 0 2 500 1 500 3 1000 750 00 V 0 2 500 1 500 3 1000 The accuracy of ACV DCV is equal to ACV s with 10 more digits added GW INSTEK APPENDIX AC Current AC Coupling Mode AC DC Coupling Mode Measurement method Current to the fuse and current shunt AC coupled true RMS measurement measures the AC component only Crest factor Maximum 3 at full scale Rate Range Accuracy 20 Hz to 45 Hz 45Hzto2kHz 2kHzto 10KHz Med 10 0000mA 1 5 400 0 5 400 2 800 100 000mA 1 5 120 0 5 120 2 300 1 00000A 1 5 120 0 596 120 2 300 10 0000A 2 120 1 120 10 0000mA 0 5 500 2 1000 100 000mA 0 5 200 296 500 1 00000A 0 5 200 2 500 10 0000 1 200 Additional Rate Error Count med 50 fast 500 Shunt resistance Range SHUNT Burden voltage 10mA 10 lt 0 15V 100mA 10 lt 1 5V 1A 0 10 lt 0 8V 10A 0 010 lt 0 6V 153 GW
18. INJACK INPUTR TRIG 0010 VOLT 10M INT 1A 10G EXT 10A LEVEL 2 BEEP LIGHT SN FACTORY PASS LIGHT 1 112345678 LIGHT 2 YES FAIL LIGHT 3 LIGHT 4 LIGHT 5 140 GW INSTEK APPENDIX Factory Default Settings Measurement Item DCV Range AUTO Rate 5 5 5 BEEP Pass LIGHT 3 S N N A FACTORY NO MEAS Menu CONT 00100 INJACK VOLT INPUT R 10M TEMP Menu SENSOR TYPE J SIM 23 00 UNIT C 1 0 Menu USB USB CDC TX Term EOL CR LF FW N A 141 GW INSTEK GDM 8351 User Manual Replacing the AC Source Fuse Fuse Ratings Type Rating Size 0 125AT 100 120 5mm X 20mm 0 003AT 220 240 5mm X 20mm N Only replace the fuse with a fuse of the correct type Note and rating Steps 1 Turn the DMM off and take out the power cord 2 Remove the fuse socket using a flathead screwdriver TS 3 Remove the fuse in the holder and replace with the correct type and rating 4 Ensure the correct line voltage is lined up with the arrow on the fuse holder Insert the fuse socket 142 GW INSTEK APPENDIX Replacing the Input Fuse Fuse Rating Type Rating Size T1 25A 1 25A 1000V 6 3mm X 32mm N Only replace the fuse with a fuse of the correct type Note and rating Steps 1 Turn the DMM off 2 Press the fuse holder with your finger and turn anticlockwise This will release the fuse holder from the panel WU
19. Measurement 5 Temperature Measurement 53 Dual Measurement Overview 57 Advanced Measurement Overview 62 dBm dB W 63 Max Min 66 Relative Measurement 67 Hold 69 Compare 70 Math 72 SYSTEM DISPLAY 76 View Serial Number 77 View Version Number 77 Brightness 78 Input Resistance Settings 79 GW INSTEK GDM 8351 User Manual Frequency Period Input Jack Settings 80 Digital Fili ss eie er in 81 Restore Factory Default Settings 85 sio QD DO GEHT 86 DIGITAL IO REA REA ER 88 Digital 1 OvervieW 89 REMOTE CONTROL roten tranne rien 93 Configure Remote Control Interface 94 Return to Local Control 99 COMMAND OVERVIEW teet trt 100 Command Syntax 100 Command List 3 104 139 140 System Men
20. V COM ports Type Recommended for measuring resistances larger than 1kQ 4 wire Compensates the test lead effect using Set 2W 4W 1 the 4W compensation ports HI LO sense ports in addition to the standard V COM ports Recommended for measuring sensitive resistances smaller than 1kQ Press the 2W 4W key once to activate 2W Measurement resistance measurement Press the 2W 4W key twice to activate 4W resistance measurement 2 The mode will switch to the selected resistance mode immediately as shown below Display 2W AW Resistance Measurement units range i UTOF V rait l 9 it Connection For 2W measurement connect the test leads between the VOA t terminal and the COM terminal For 4W measurement connect the test leads between the terminal and the terminal as you would for 2W measurement Connect the sense leads between the LO and HI sense terminals GW OPERATION 4 SENSE INPUT H 04 Va Jt 10A 1A FUSE NC T 1 Bon 1 25A 1000V 43 GW INSTEK GDM 8351 User Manual Select the Resistance Range The resistance range can be set automatically or manually Auto Range To turn the automatic range selection On Off press the AUTO key Manual Range Press the Up or the Down key to select the range The AUTO indic
21. digital filter on or off See page 81 TN Sets the type of filter and the size of the rolling window See page 82 FILTER Enters the configuration menu for System Settings Measurement Settings Temperature measurement settings I O settings Terminal character settings and Firmware installation See page 76 for the system menu dBm Measures dBm W see SHIFT2 MENU E gt T page 63 SHIFT EXIT ES When used as SHIFT key it is used to access the secondary functions associated with the measurement keys When used as an EXIT key it will exit out of menu systems GW INSTEK GETTING STARTED AUTO ENTER When used as an AUTO key it C will set the range of the selected function to autorange When used as an ENTER key it will confirm the entered value or menu item Arrow Keys RANGE The arrow keys are used to CO navigate the menu system and edit values CD The Up and Down arrow keys will also manually set the range for the voltage and current measurements RANGE The Left and Right arrow keys will also toggle the refresh rate between the fast medium and slow F M S rates Display Overview Primary measurement units Primary measurement Secondary Display function icons Secondary measurement units GWINSTEK con sss 1 120000 Dual Measurement AC DC 2W4W AUTO F S HOLDRELMIN MAX 1 RMT AYE RATIOUNCAL MEMUSBSTOnIF s w KI
22. electrical shock Fuse Fuse type 0 125AT 100 120VAC N 0 063AT 220 240 VAC WARNING Make sure the correct type of fuse is installed before power up e To avoid risk of fire replace the fuse only with the specified type and rating Disconnect the power cord before fuse replacement Make sure the cause of a fuse blowout is fixed before fuse replacement Cleaning the Disconnect the power cord before cleaning strument Usea soft cloth dampened in a solution of mild detergent and water Do not spray any liquid Do not use chemicals containing harsh material such as benzene toluene xylene and acetone Operation Location Indoor no direct sunlight dust free Environment almost non conductive pollution Note below Temperature 0 C to 55 C e Humidity 0 35 C lt 9076 RH gt 35 8076 RH e Altitude lt 2000m GW INSTEK GDM 8351 User Manual Note EN 61010 1 2010 specifies the pollution degrees and their requirements as follows The GDM 8351 falls under degree 2 e Pollution refers to addition of foreign matter solid liquid or gaseous ionized gases that may produce a reduction of dielectric strength or surface resistivity e Pollution degree 1 No pollution or only dry non conductive pollution occurs The pollution has no influence e Pollution degree 2 Normally only non conductive pollution occurs Occasionally however a temporary conductivity ca
23. m Set the Hold Use the Up and Down arrow keys to select a Threshold hold threshold level as a percentage Range 0 0196 0 196 196 1096 Deactivate Hold Press the HOLD key for 2 seconds to deactivate Measurement the hold measurement or simply activate another measurement function 69 GW INSTEK GDM 8351 User Manual Com pare Measurement Compare measurement checks to see if the measurement data stays between a specified upper high and lower low limit Applicable The compare function can be used with the measurements following basic measurement functions ACV DCV ACI DCI Hz P TEMP 18 Procedure 1 Press SHIFT gt HOLD COMP 2 The high limit setting appears Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decimal point Use the Up and Down arrow keys to edit the selected digit or to place the position of the decimal point 3 Press the Enter key to save the high limit setting and automatically go on to the low limit setting 4 Enter the low limit setting the same fashion as the high setting 5 Press the Enter key to confirm the low limit settings 6 The compare measurement results will appear immediately If the current measurement reading is between 70 INSTEK the high and low limits PASS will be displayed on the secondary display If the reading is below the low limit LOW will be displayed If the reading is abo
24. the continuity passes FAIL Beeps when the continuity fails OFF Beeper is turned off Procedure 1 Press MENU 2 Go to the SYSTEM menu on level 1 3 Go to the BEEP menu on level 2 4 Set the BEEP setting to PASS FAIL or OFF 5 Press the Enter key to confirm the beeper settings 6 Press EXIT to exit the BEEP setting menu Display Beep Beep menu setting indicator E TEER oor UCET 50 GW INSTEK OPERATION Frequency Period Measurement The GDM 8351 can be used to measure the frequency or period of a signal This function can measure either the voltage frequency period or current frequency period depending on which jack the input signal is input from Range Frequency 10Hz 1MHz Period 1 0 15 100ms Procedure To measure frequency press the Hz P key once The frequency will be displayed on the primary screen and the range will be displayed on the secondary display To measure the period press the Hz P key twice The period will be displayed on the primary screen and the range will be displayed on the secondary display Display Frequency or Voltage Current Measurement unis X range setting Connection Connect the test lead between the VA dt terminal and the COM terminal The display updates the reading SENSE INPUT i Q4W VO Ht 51 GW INSTEK GDM 8351 User Manual Frequency Period Settings The input voltage curre
25. to place the position of the decimal point 74 GW INSTEK OPERATION 4 Press Enter to confirm the REF setting and to begin the Percentage measurement Display Calculated percentage function meausurement indicator DC AUTO mania td Deactivate Math Press SHIFT MX MN to deactivate the Measurement MATH function or simply activate another measurement function 75 GW INSTEK GDM 8351 User Manual SYSTEM DISPLAY CONFIGURATION View Serial Number eerta te 77 View Version 77 Brightness Settings ud oeint 78 Input Resist nce Sebbligs eene hibet rd dnd ebd uaa 79 Frequency Period Input Jack Settings 80 Digital 81 Digital Filter Overview sss 81 Digital Filter Type Settings 83 Restore Factory Default 85 ji T T 86 Trigger Settings neben 86 nie rettet 87 76 GW INSTEK SYSTEM DISPLAY CONFIGURATION View Serial Number Procedure 1 Press the MENU key 2 Go to SYSTEM on level 1 3 Go to S N on level 2 4 The serial number will be displayed across both the primary and secondary display cu rm 220001 S i Dl Exit Press the EXIT key twice to go b
26. 0 000mV 0 001mV 120 000 0 01296 8 1 00000 V 0 00001V 1 20000 0 01296 5 10 0000 V 0 0001V 12 0000 0 01296 5 100 000 V 0 001V 120 000 0 01296 5 1000 00 0 01 V 1020 00 0 01296 5 1 When the input value exceeds the full scale of the selected range the display will show OL over load on the display 2 The specifications are guaranteed to an input voltage of 1000V A beeping alarm will go off when the input voltage is higher than 1000V DC Current Rangel Resolution full scale Accuracy 10 0000mA 0 0001mA 12 0000 0 05 15 100 000mA 0 001 120 000 0 05 5 1 00000A 0 00001 A 1 20000 0 2 5 10 0000A 0 0001 A 12 0000 0 2 5 1 When the input value exceeds the full scale of the selected range the display will show OL over load on the display 2 The specifications are guaranteed to an input of 10 A beeping alarm will go off when the input value is higher than 10A Diode Test voltage Resolution Maximum reading Accuracy 6V 0 0001 V 5 9999V 0 012 5 The diode test voltage 6V 1mA Continuity Range Resolution Maximum reading Accuracy 1000 000 0 010 1200 00 0 1 8 Without REL function add 0 2 Q additional error 147 GW INSTEK GDM 8351 User Manual Resistance 1 21 Range Resolution full scale Curren Accuracy 4W source 100 0000 0 0010 120 000 1 0 05 8 1 00000KQ 0 00001 KQ 1 20000 mA 0 05 5 10 0000KQ 0 0001 KQ 12 0000 100 0 05
27. 0 10A RES 10E 1 100Q 10E 2 1k 10E 3 10k Q 10E 4 100k 10E 5 1M 10E 6 10M 10E 7 100M 0 FRES 10E 1 100 10E 2 1k 10E 3 10k Q 10E 4 100kQ 10E 5 1M 10 6 10 10E 7 100M 10E 9 10nF 10E 8 100nF 10E 7 1pF 10E 6 10pF 10 5 100 CONFigure AUTO Sets Auto Range on or off on the first display Parameter ON OFF Example CONF AUTO ON CONFigure AUTO Returns the Auto Range status of the function on the 15 display Return Parameter 0 1 1 Auto range 0 Manual range 112 GW INSTEK COMMAND OVERVIEW Secondary Display CONFigure2 Commands CONFigure2 VOLTage DC Sets measurement to DC Voltage on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 VOLT DC 1 Sets the voltage range to 1 volts CONFigure2 VOLTage AC Sets measurement to AC Voltage on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 VOLT AC Sets the measurement mode to AC voltage CONFigure2 CURRent DC Sets measurement to DC Current on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 CURR DC 10e 3 Sets the DC current range to 10mA on the second display CONFigure2 CURRent AC Sets measurement to AC Current on the second display and specifies the range Parameter None Range lt
28. 00 0 596 100 2 200 1 00000A 0 00001 1 20000 1 5 100 0 5 100 2 200 10 0000A 0 0001A 12 0000 1 5 100 196 4 100 1 Specifications are for sine wave inputs that are greater than 5 of range 2 Input current 5k 10kHz lt 220mArms 3 The accuracy of ACI DCI is equal to ACI s with 10 more digits added The specifications are guaranteed to 10A A beeping alarm will go off when the input current being measured is higher than 10A Frequency Accuracy Rate 10Hz to IMHz Slow gt 10Hz Med gt 20Hz 0 01 3 Fast gt 200Hz Voltage Measurement Sensitivity Range 10 Hz to 100kHz 100kHz to 1 2 100 40 mVrms 0 3Vrms 1V At least 5 of voltage range 0 5Vrms 10V 750V At least 5 of voltage range Current Measurement Sensitivity Range 20 10kHz 10mA 10A At least 5 of current range Thermocouple Specifications Measurement Accuracy Accuracy Type Range Resolution 200 0 C 0 300 C JKT 200 300 C 0 01 C 0 4 C 0 2 C Specifications do not include probe accuracy 149 GW INSTEK GDM 8351 User Manual Capacitance Range Resolution Full Scale Test Current Accuracy 10 00nFl 0 01nF 12 00 10pA 2 0 10 100 0nF 0 1nF 120 0 10 2 0 4 1 000p1F 0 001 F 1 200 100 2 0 4 10 00p1F 0 01 12 00 2 0 4 100 0 0 lpF 120 0 1 2 0 4 Specifications are for film Capacitance inputs that are greater than 10 range c
29. 000 View the result in When the reference resistance is less than 500 Watts it is possible to calculate the power in watts If the reference resistance is equal to or greater than 500 then this step can be ignored Press SHIFT gt MENU dBm again to view the result in watts Display Power measurement Reference and unit resistance AC AUTO 5 h UO JOU x an Exit dBm Press SHIFT MENU dBm again to exit the Measurement dBm measurement or simply activate another measurement function 64 INSTEK Measure dB dB is defined as dBm dBmref When the dB measurement is activated the DMM calculates the dBm using the reading at the first moment and stores it as dBmref Procedure 1 Select ACV or DCV measurement See page 32 2 Press the SHIFT Hz P dB keys to activate the dB measurement mode The 1st display shows the dB reading the second display shows the voltage reading Display dB Voltage measurement reading 4221 LILILILILI ly View the dBm To view the dBm reference value press the Reference Value 2ND key The Up and Down arrow keys can also be used to change the voltage range or the reading Exit dB Press the SHIFT Hz P dB keys again to exit Measurement the dB measurement or simply activate another measurement function 65 GW INSTEK GDM 8351 User Manual Max Min Measurement Maximum and Minimum measurement fu
30. 0000 1 0 OPC 1 is placed in the output queue when all the pending operations are completed OPC Sets the operation complete bit in SERS Standard Event Status Register when all pending operations are completed PSC Returns power On clear status Return parameter lt Boolean gt 0 1 07 don t clear 1 clear PSC Clears power On status Parameter lt Boolean gt 0 1 0 don t clear 17 clear RST Recalls default panel setup SRE Returns the SRER Service Request Enable Register contents SRE Sets SRER contents Parameter lt NR1 gt 0 255 Example 5 7 Sets the SRER to 00000111 137 GW INSTEK GDM 8351 User Manual STB Returns the SBR Status Byte Register contents Example STB gt 64 Returns the contents of the SBR as 01000000 TRG Manually triggers the DMM For the following command sets please refer to the status system diagram on page 145 STAT QUES EVEN STAT QUES ENAB STAT QUES ESR ESE ESE STB SRE SRE 138 GW FAQ FAQ The DMM performance doesn t match the specifications Make sure the device is powered On for at least 30 minutes within 18 28 C This is necessary to stabilize the unit to match the specifications The measured voltage does not match the expected value There are a number of reasons why the measured value may not match the expected v
31. 0123E 01 Returns the DC AC voltage measurement as 0 010123V MEASure CURRent DC Returns the DC current measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS CURR DC gt 0 00703E 02 Returns the DC current measurement as 0 0703 mA GW INSTEK COMMAND OVERVIEW MEASure CURRent AC Returns the AC current measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS CURR AC gt 0 00872E 02 Returns the AC current measurement as 0 0872mA MEASure CURRent DCAC Returns the DC AC current measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS CURR DCAC gt 0 01245E 02 Returns the DC AC current measurement as 0 1245 mA MEASure RESistance Returns the 2W resistance measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS RES gt 1 00156E 03 Returns the 2W measurement as 1 00156kQ MEASure FRESistance Returns the 4W resistance measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS FRES gt 1 11365E 03 Returns the 4W measurement as 1 11365kQ MEASure FREQuency Returns the frequency measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS FREQ gt 1 00123E 03 Returns the freque
32. 351 User Manual Crest Factor Table Background Crest factor is the ratio of the peak signal amplitude to the RMS value of the signal It determines the accuracy of AC measurement If the crest factor is less than 3 0 voltage measurement will not result in error due to dynamic range limitations at full scale If the crest factor is more than 3 0 it usually indicates an abnormal waveform as seen from the below table Crest Factor Table Waveform Shape Crest factor Square wave 1 0 Sine wave 1 414 Triangle sawtooth 1 732 Mixed frequencies PINNAS 144 20 SCR output 100 10 1 414 3 0 White noise 3 0 4 0 AC Coupled pulse train gt 3 0 Spike 29 0 GW INSTEK OPERATION AC DC Current Measurement The GDM 8351 series DMMs have two input terminals for current measurement 1A terminal for current less than and a 10A terminal for measurements up to 10A The units can measure 0 10A for both AC and DC current Set to ACI DCI 1 Press SHIFT or SHIFT ACV to Measurement measure DC or AC current respectively For AC DC current press SHIFT followed by both the DCV and ACV key at the same time 2 The mode will switch to AC DC or AC DC mode immediately as shown below AC amp DC Current Measurement indicator units range D 33 n Inmcrn I A Lt IW Connection Connect the test lead between the 10A terminal and the COM terminal or DC AC 1A termin
33. 5 100 000KO 0 001KO 120 000 10pA 0 0596 5 1 00000 0 0 00001 0 1 20000 1pA 0 05 5 10 0000 0 0 0001 0 12 0000 0 5pA 0 396 5 100 000 0 0 001MQ 120 000 0 5pA 10M 3 096 8 1 Specifications are for 4 wire ohm measurement or 2 wire ohm measurement using the REL function Without the REL function add 0 2 additional error when using 2 wire resistance measurement 2 When measuring resistances greater than 500kQ please use shielded test leads to eliminate the noise interference that may be induced by standard test leads AC Voltage Accuracy 1 year 23 C 5 C 1 2 Full 20 21045 45Hzto 10kHzto30 30kHzto Range Resolution Scale Hz 10kHz kHz 100 kHz 100 000mV 0 001 120 000 1 100 0 3 100 1 5 300 5 300 1 00000 V 0 00001V 1 20000 1 100 02 100 1964100 3 200 10 0000V 0 0001 12 0000 1 100 0 2 100 1 100 3 200 100 000V 0 001 120 000 1 100 0 2 100 1 100 3 200 750 00 0 01V 765 00 1 100 02 100 1964100 3 200 1 Specifications are for sine wave inputs that are greater than 5 range 2 Rate in Fast Input ACV Frequency gt 200Hz The specifications are guaranteed to an input of 750V A beeping alarm will go off when the input value is higher than 750V GW INSTEK APPENDIX AC Current Accuracy Range 10181 Resolution Full Scale 20Hzto45 45 Hzto2 2 kHz to Hz kHz 10KHz 10 0000mA 0 0001mA 12 0000 1 5 100 0 596 100 2 200 100 000mA 0 001 120 000 1 5 1
34. CALCulate MINimum Returns the minimum value from the Max Min measurement CALCulate MAXimum Returns the maximum value from the Max Min measurement 125 GW INSTEK GDM 8351 User Manual CALCulate HOLD REFerence Sets the percentage threshold for the Hold function Parameter lt NRf gt 0 01 0 1 1 10 Example CALC HOLD REF 10 Sets the hold percentage to 10 CALCulate HOLD REFerence Returns the percentage threshold from the Hold function CALCulate REL REFerence Sets the reference value for the relative function Parameter lt NRf gt MIN MAX Example CALC REL REF MAX Sets the reference value to the maximum allowed CALCulate REL REFerence Returns the reference value from the relative function CALCulate LIMit LOWer Sets the lower limit of the compare function Parameter lt NRf gt MIN MAX Example CALC LIM LOW 1 0 Sets the lower limit to 1 0 CALCulate LIMit LOWer Returns the lower limit of the compare function CALCulate LIMit UPPer Sets the upper limit of the compare function Parameter lt NRf gt MIN MAX Example CALC LIM UPP 1 0 Sets the upper limit to 1 0 126 GW INSTEK COMMAND OVERVIEW CALCulate LI Mit UPPer Returns the upper limit of the compare function CALCulate DB REFerence Sets the reference value for the dB function Parameter lt NRf gt MIN MAX Example CALC DB REF MAX Sets the reference voltage for dB measurements
35. Dual Measurement Multimeter GDM 8351 USER MANUAL GW INSTEK PART NO 82DM 83510E01 150 9001 CERTIFIED MANUFACTURER GW INSTEK This manual contains proprietary information which is protected copyright 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 Jhongsing Rd Tucheng Dist New Taipei City 236 Taiwan GW INSTEK Table of Contents Table of Contents SAFETY 65 0 2 222 5 GETTING STARTED einer en nh nr rh nnn int 10 Characteristic e opas pU EN a VU DR 11 5 ttn rete ae epe ii 13 23 OPERATION t penrai sap E asiata 28 Basic Measurement Overview 30 AC DC Voltage Measurement 32 AC DC Current Measurement 37 Resistance 42 Diode 45 Capacitance Measurement 46 CONTINUITY Te5t iier treten eee eorr eas 48 Frequency Period
36. FT 2W 4W TEMP The temperature mode appears showing the temperature on the primary display and the type of sensor on the secondary display Display Temp Measurement units Sensor type NA IIA ULI g ALIE s Connection Connect the sensor lead between the VO gt t terminal and the COM terminal The display updates the reading SY SENSE INPUT Q4 Vat FUSE ZACAT I 1 25 1000 OO 53 GW INSTEK GDM 8351 User Manual Set the Temperature Units Range Units C F Procedure 1 Press the MENU key 2 Go to TEMP on level 1 3 Go to UNIT on level 2 4 Select either C Celsius or F Farenheit 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the temperature menu Display Temperature Unit menu unit setting indicator gun MIT E LIM 1 04d GW INSTEK OPERATION Select Thermocouple Type The GDM 8351 accepts thermocouple inputs and calculates the temperature from the voltage difference of two dissimilar metals Thermocouple type and reference junction temperature are also considered Thermocouple Type Measurement Range Resolution range 200 to 300 C 0 01 C 200 to 300 C 0 01 C 200 to 300 C 0 01 C Procedure 1 Press the MENU key 2 Go to TEMP on level 1 3 Go to SENSOR on leve
37. Gon REP Liv LI IX 7 3 Press Enter to confirm the filter type and the CNT setting The DMM will now automatically go to the WINDOW setting 4 Use the Up and Down arrow keys to set the window threshold settings 4 p ID LI 5 Press Enter to confirm the settings 6 Press EXIT to cancel 84 GW GDM 8351 User Manual Display Filter indicator I log v Lx FLT Deactivate Digital Press FILTER to deactivate the FILTER Filter function gt 1 1 1 1 Li n GW INSTEK SYSTEM DISPLAY CONFIGURATION Restore Factory Default Settings The factory default settings can be restored at anytime from the System menu Please see the Appendix on page 141 for a list of the factory default settings Range Factory DEF YES NO Procedure 1 Press the MENU key 2 Go to SYSTEM on level 1 3 Go to FACTORY on level 2 4 Set the FACTORY DEF setting to YES or NO Choosing YES will restore the factory default settings 5 Press the Enter key to confirm and to restore the factory default settings immediately OK DEF will be displayed when the default settings are restored Display Factory default setting 85 GW INSTEK GDM 8351 User Manual Trigger The measurements can be triggered internally or externally When set to internal the DMM will be triggered automatically according the refresh rate Whe
38. INSTEK GDM 8351 User Manual Resistance 2 wire Q and 4 wire Q Measurement method 2 wire ohms or 4 wire ohms Open circuit voltage Approximately 7 5 VDC Input protection 500Vpeak on all ranges Zeroing error 0 050 or less excluding test lead resistance in each range when the REL function is used Diode Measurement method 1mA 0 0 5 constant current source Open circuit voltage Approximately 7 5 VDC Input protection Input protection of 500V peak Additional Rate Error Count Med 50 Fast 200 Continuity Measurement method 1mA 0 0 5 constant current source Open circuit voltage Approximately 7 5 VDC Input protection Input protection of 500V peak Continuity threshold 00 10000 Threshold step 10 Additional Rate Error Count Med 60 Fast 200 GW INSTEK APPENDIX Frequency Measurement method Reciprocal counting technique Input impedance x 2 in parallel with 100pF on all ranges Maximum input voltage 750 Vrms on all ranges Input protection 1200V peak on all ranges with gas discharge Refresh Rate Gate Time sec Slow 1 Mid 0 1 Fast 0 01 Capacitance Measurement method DC recharge amp discharge Input protection 500 Vpeak on all ranges Capacitance is measured by applying a set current to the capacitor and measuring the change in voltage Dv over a period of time Dt kno
39. INSTEK GDM 8351 User Manual ZZ C E N Make sure the ground connector on the power Note cord is connected to a safety ground This will influence the measurement accuracy Power Up Steps 1 Ensure the correct line voltage is lined up with the arrow on the fuse holder If not see page 142 to set the line voltage and fuse 2 Connect the power cord to the AC voltage input va 3 Push to turn on the main power switch on the front panel 4 The display turns on and shows the last function that was used before the power was reset 24 GW INSTEK GETTING STARTED How to Use the Instrument Background The following section will introduce to you how to access the basic functions on the DMM as well as how to navigate the menu system and edit the parameter values Using the Any of the primary functions can be used by Function keys simply pressing the desired function key For example To activate the DCV function press the DCV key DCI DCV To activate a secondary function first press the SHIFT key followed by the function key for the secondary function For example To activate DCI measurement first press the SHIFT key SHIFT will be highlighted on the display Next press the function key This will activate the DCI mode DCI SHIFT oV EXIT gt GW GDM 8351 User Manual Navigating the Menu System 26 The menu system
40. K Current Ranges 10mA 10044 12mA 1A 100mA 1 120mA 1A 1A 100pA 1 2A 1A 10A 1mA 12A 10A N T For further details please see the specifications on page 146 GW GDM 8351 User Manual N Note DC currents with AC components cannot be accurately measured if the DC AC component exceed the dynamic range for the selected DC range Any current exceeding the dynamic range will be clipped at the upper lower range limit Under these conditions the range that is chosen with the Auto range function may be too small For example A C D Dynamic Range 0 Dynamic Range B E A B Input exceeds the dynamic range C D The DCI offset causes the input to exceed the upper dynamic range E The DCI offset causes the input to exceed the lower dynamic range 40 The DC current range should be manually selected when all of the following conditions are true When DCI measurement is used e When the signals being measured contain both DC and AC components e When the amplitude of the AC component in the measured signal is higher or lower than the dynamic range of the range being currently selected by the auto range function GW INSTEK OPERATION Maximum DCI Selected DCI Range Dynamic Range PYRE RANE HEIMA 30mA max DC 100mA 300mA max DC1A 1 25A max DC10A t12A max 41 GW GDM 8351 User Manual Resistance Measurement Measurement 2 wire Uses the standard
41. Measurement Functions The following table lists all the advanced measurement functions and which of the basic measurement functions that they support Basic Measurement Advanced ACV ACI Meas DCV DCI Q Hz P TEMP DIODE CAP dB X X X X X X dBm 2 X X X X X X Max Min i ig e X e Relative M e e X Hold e X X Compare e e X Math f X X 62 GW INSTEK OPERATION dBm dB W Measurement dBm dB Calculation Overview Using the or DCV measurement results the DMM calculates the dB or dBm value based on a reference resistance value in the following dBm 10 logio 1000 Vreading Rref dB dBm dBmref W Vreading Rref Where Vreading Input Voltage ACV or DCV Rref Reference resistance simulating an output load dBmref Reference dBm value Measuring dBm W Procedure 1 Select ACV or DCV measurement See page 32 2 To measure dBm press SHIFT MENU dBm The primary display will show the dBm measurement while the secondary display shows the reference resistance 63 GW INSTEK GDM 8351 User Manual Display dBm Reference measurement resistance d ca co on Setting the To set the reference resistance use the Up and Reference Down arrow keys Resistance The selectable reference resistances are shown below Selectable reference resistances 2 4 8 16 50 75 93 10 124 125 135 150 250 300 500 600 800 900 1000 1200 8
42. NRf gt MIN MAX DEF Example CONF2 CURR AC 10e 2 Sets the measurement mode to ACI with a 100mA range on the second display 113 GW INSTEK GDM 8351 User Manual CONFigure2 RESistance Sets measurement to 2W Resistance on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 RES 10e3 Sets the range to 10kQ on the second display CONFigure2 FRESistance Sets measurement to 4W Resistance on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 FRES 10e3 Sets the range to 10kQ on the second display CONFigure2 FREQuency Sets measurement to Frequency on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 FREQ MAX Sets the frequency measurement range to max on the second display CONFigure2 PERiod Sets measurement to Period on the second display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF2 PER Sets the DMM to period measurement using the previous range on the second display CONFigure2 OFF Turns the second display function off Parameter None 114 GW INSTEK COMMAND OVERVIEW CONFigure2 FUNCtion Returns the current function on the second display Return parameter VOLT VOLT AC CURR CURR AC RES FRES FREQ PER NON CONFigure2 RANGe Retur
43. NSe TEMPerature TCOuple TY PE Returns the thermocouple type Return parameter J K T 120 GW INSTEK COMMAND OVERVIEW SENSe TEMPerature RJUNction SIMulated Set temperature simulation value Parameter lt NRf gt 0 00 50 00 Example SENS TEMP RJUN SIM 25 00 Sets the thermocouple junction temperature to 25 C SENSe TEMPerature RJUNction SIMulated Returns temperature simulation value Return parameter NR1 0000 5000 where 0000 0 00 C 5000 50 00 C SENSe DETector RATE Sets the detection rate sample rate Parameter RATE S M F Example SENS DET RATE S Sets the rate to slow S SENSe DETector RATE Returns the sample rate Return parameter SLOW MID FAST SENSe AVERage TCONtrol Selects the digital filter Parameter MOV REP Example SENS AVER TCON MOV Sets the digital filter to the moving filter SENSe AVERage TCONtrol Returns the current digital filter type Return parameter MOV moving REP repeating 121 GW INSTEK GDM 8351 User Manual SENSe AVERage COUNt Sets the digital filter average count Parameter lt 1 gt 2 320 MIN MAX Example SENS AVER COUN 100 Sets the digital filter average count to 100 SENSe AVERage COUNt Returns the current digital filter average count Return parameter lt NR1 gt 002 320 SENSe AVERage WIN Dow Sets the digital filter window Parameter 0 01 0 1 1 10 0 none Example SENS AVER
44. Rf gt MIN MAX DEF Example CONF VOLT DCAC Sets the DC AC voltage range to auto range CONFigure CURRent DC Sets measurement to DC Current on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF CURR DC 10e 3 Sets the DC current range to 10mA 109 GW INSTEK GDM 8351 User Manual CONFigure CURRent AC Sets measurement to AC Current on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF CURR AC 10e 2 Sets the measurement mode to ACI with a 100mA range CONFigure CURRent DCAC Sets measurement to DC AC Current on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF CURR DCAC 10e 2 Sets the measurement mode to DC AC Current with a 100mA range CONFigure RESistance Sets measurement to 2W Resistance on the first display and specifies range Parameter None Range lt NRf gt MIN MAX DEF Example CONF RES 10e3 Sets the range to 10kO CONFigure FRESistance Sets measurement to 4W Resistance on the first display and specifies range Parameter None Range lt NRf gt MIN MAX DEF Example CONF FRES 10e3 Sets the range to 10kQ 110 GW INSTEK COMMAND OVERVIEW CONFigure FREQuency Sets measurement to Frequency on the first display and specifies the range Parameter None Range l
45. W INPUT VO Ht 8 S 10A 1 C T Act 1500 3 3 77 2 Ly ey ey 60 GW INSTEK OPERATION Voltage Frequency Period and Current Measurement EE H pre A 1000V 200Vpk 750V 22 500Vpk E t A 1A a 0 10A ZA Note DC Current measurements will be displayed as a negative value as the polarity of the current leads has been reversed Please take into account the resistance of the test leads and internal resistance of the current connection as it is in series with the test circuit The above measuring configuration is used to measure the voltage present on the resistance under test and the current through the resistance under test when using the DCI DCV or ACI ACV dual measurement function 61 GW INSTEK GDM 8351 User Manual Advanced Measurement Overview Advanced measurement mainly refers to the type of measurement which uses the result obtained by one of the basic measurements ACV DCV ACI DCI Resistance Diode Continuity Frequency Period and Temperature Supported Advanced
46. WIND 0 1 Sets the digital filter window to 0 176 SENSe AVERage WINDow Returns the current digital filter window value Return parameter 0 01 0 1 1 10 NONE SENSe AVERage STATe Turns the digital filter on or off Parameter ON OFF Example SENS AVER STAT ON Turns the digital filter on SENSe AVERage STATe Returns the state of the digital filter on or off Return parameter 0 1 O OFF 1 ON 122 GW INSTEK COMMAND OVERVIEW SENSe FREQuency INPutjack Assigns an input terminal for the frequency function Parameter 0 1 2 0 volt 121A 2 10A Example SENS FREQ INP 0 Sets the input jack to the Volt input terminal SENSe FREQuency INPutjack Returns the assigned input terminal used for the frequency function Return Parameter VOLT 1A 10A SENSe PERiod I N Putjack Assigns an input terminal for the period function Parameter 0 1 2 0 volt 121A 2 10A Example SENS PER INP 0 Sets the input jack to the Volt input terminal SENSe PERiod I N Putjack Returns the assigned input terminal used for the period function Return Parameter VOLT 1A 10A SENSe CONTinuity THReshold Sets the continuity threshold in ohms Parameter lt gt 0 1000 Example SENS CONT THR 500 Sets the continuity threshold to 500 ohms SENSe CONTinuity THReshold Returns the continuity threshold Return Parameter lt 1 gt 0 1000 123 GW INSTEK GDM 8351 User Manua
47. ack to the measurement screen View Version Number Procedure 1 Press the MENU Key 2 Go to FW on level 1 3 Go to VER on level 2 4 The firmware version number will be displayed in the secondary display 5 Press Exit to exit from the version menu v IU i AI a rine VERSILUN N For details about firmware updates please contact ote the GW Instek Service Center or visit the GW Instek website at www gwinstek com GW INSTEK GDM 8351 User Manual Brightness Settings The display has 5 settable brightness levels Range Brightness 1 dim 5 bright Procedure 1 Press the MENU key 2 Go to SYSTEM on level 1 3 Go to LIGHT on level 2 4 Set the light setting between 1 dim and 5 bright 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the brightness settings Display Brightness setting il je Lu Li 78 GW INSTEK SYSTEM DISPLAY CONFIGURATION Input Resistance Settings The 100mV and 1V DC voltage ranges can be set to an input resistance of 10 or 10GQ This setting is only applicable for DC voltage Range Input resistance 10 0 10 0 Default 10MQ Procedure 1 Press the MENU key 2 Go to MEAS on level 1 3 Go to INPUT R on level 2 4 Set the input resistance to 10MO or 10GQ 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the input resistance menu Display Input resistance sett
48. al and the COM terminal depending on the input current For current lt 1A use the 1A terminal For current up to 10A use the 10A terminal The display updates the reading 37 GW GDM 8351 User Manual gx SENSE INPUT VO t HI L 1 1000 200Vpk LI Ly 5 500Vpk 4 E zd gt H 10A 1A T FUSE Neri soov SEDE V D lY f 10 GW INSTEK OPERATION Select the Current Range The current range can be set automatically or manually Auto Range To turn the automatic range selection On Off press the AUTO key The most appropriate range for the currently used input jack will be automatically selected The DMM is able to do this by remembering the last manually selected range and using that information to determine the smallest current range that the auto range function will switch to When the current input is switched to another terminal the range must be manually set Manual Range Press the Up or the Down key to select the range The AUTO indicator turns Off automatically If the appropriate range is unknown select the highest range Selectable Range Resolution Full scale INJAC
49. alues 1 Ensure that all connections are connected securely and have a good contact at all times Poor contacts could result in erroneous measurements 2 Ensure that the appropriate input resistance has been set in the System menu For 100mv and 1V ranges the input resistance can be set to either LOMO or 1060 3 When measuring AC voltage or current the RMS of the voltage peak is measured not the voltage peak See page 35 for details 4 The measurement rate settings can have an effect on the accuracy of the measurement Slow measurements are more accurate while the fast rate is not as accurate 5 Ensure that an appropriate range setting is used If a too large range is used the resolution or the measurement may be affected For more information contact your local dealer or GWInstek at www gwinstek com marketing goodwill com tw 139 GW A ppenpix System Menu Tree GDM 8351 User Manual LEVEL 1 SYSTEM k J_ MEAS TEMP k O TX TERMk _ FW LEVEL 2 VER UPDATE Vx xx NO YES LEVEL 2 LEVEL 2 TX EOL CR LF CR LF CR USB RS232 USB CDC 9600 USB TMC 19200 38400 57600 115200 LEVEL 2 SENSOR SIM UNIT TYPE J 23 00 F TYPE T LEVEL 2 CONT
50. apacitance measurements may be affected by the stray capacitance on the test cables Before testing use the REL function to compensate for the stray capacitance from the test cables GW INSTEK APPENDIX Additional Specifications The Additional Specifications apply in addition to the Specifications listed on page 146 when the operating temperature exceeds 18 C 28 C DC Voltage Measurement method Sigma Delta A to D converter Input protection 1000V peak on all ranges Range Typical Input Impedance 100mV 1V 10 0 2 or 10GO 10V 11 1 2 100 V 10 1 2 1000 V 10 0 MO 296 Additional Rate Error Count med 50 fast 200 DC Current 10mA 1A range has voltage limit protection and F1 25A 1000V fuse protection And 10A range has a F12A 600V fuse protection Shunt resistance Range Shunt Burden voltage 10 10 lt 0 15V 100mA 10 lt 1 5V 1A 0 10 lt 0 8V 10A 0 010 lt 0 6V Additional Rate Error Count med 60 fast 200 GW INSTEK GDM 8351 User Manual AC Voltage AC Coupling Mode AC DC Coupling Mode Measurement method AC coupled true RMS measure the AC component with up to 400 VDC bias on any range Crest Factor Maximum 3 at full scale Input Impedance 1 MQ 2 in parallel with lt 100 pF on all ranges Maximum input voltage 750 Vrms on all ranges Input protection 1200V peak on all ranges with gas discharge Rate Frequency
51. asurement indicator units range li 1 DL 1 E LI 1 1 Connection Connect the test lead between the VO9t Ht and the COM terminal The display updates the reading 3S R Q4W VO Ht 1000V 750V 10 a FUSE AGAT 1 600V PE 2 2 32 Select the Voltage Range The voltage range can be set automatically or manually Auto Range To turn the automatic range selection On Off press the AUTO key Manual Range Press the Up or the Down key to select the range The AUTO indicator turns Off automatically If the appropriate range is unknown select the highest range Selectable Voltage Ranges N Note Range Resolution Full scale 100mV 1pV 120mV 1V 10pV 1 2V 10V 0 1mV 12V 100V 1mV 120V 750V AC 10mV 765V 1000V DC 10mV 1020V For further details please see the specifications on page 146 N Note DC voltages with AC components cannot be accurately measured if the DC AC component exceeds the dynamic range for the selected DC range Any voltage exceeding the dynamic range will be clipped at the upper lower range limit Under these conditions the range that i
52. ator turns Off automatically If the appropriate range is unknown select the highest range Selectable Range Resolution Full scale 2 1000 1mQ 1200 Ranges 1kQ 10mQ 1 2kQ 10kQ 100 12kQ 100kQ 10 120kQ 1 0 100 1 2MQ 10 0 1009 12MQ 100 0 1kQ 120MQ N For further details please see the specifications on Note page 148 GW INSTEK OPERATION Diode Test The diode test checks the forward bias characteristics of a diode by running a constant forward bias current of approximately 1mA through the DUT Set to Diode 1 Press the gt key once to activate diode Measurement measurement Note pressing the 3 key twice will activate the continuity measurement instead 2 The mode will switch to Diode mode immediately as shown below Display Diode Diode function state indicator SS ninnc r1 hl Ul ud ILEIN Connection Connect the test lead between the terminal and COM terminal Anode V Cathode COM The display updates the reading N SENSE INPUT 45 GW INSTEK GDM 8351 User Manual Capacitance Measurement The capacitance measurement function checks the capacitance of a component Set to 1 Press the SHIFT gt keys to activate Capacitance capacitance measurement Measurement 2 The mode will switch to capacitance mo
53. atus Commands Interface Commands TRIGger SOURce 130 5 2 2 20222 130 TRIGger AUTO isses eeeeeemenmen 130 0 130 130 8 0 130 TRIGger COUNL esee 131 TRIGger COUNT 2 131 5 132 2 132 132 SYSTem BEEPer ERRor 132 132 SYSTem ERRor 0 132 SYSTem VERSION 132 SYSTem DISPlay sssri 133 SYSTem DISPlay esee 133 SYSTem SERial sse 133 133 1 133 DISPlay TEXT 133 indi 133 5 0 134 DIGitalio 2 134 DIGitalio 134 DIGitalio 1 2 3 4 SETup 134 DIGitalio 1 2 3 4 SETup sss 134 STATus QUEStionable ENABle
54. control interface Likewise this mode can only be enabled or disabled via remote control Please see the digital I O commands on page 134 for full usage details Related DiGitalio MODE USER NORM Commands DIGitalio X SETup ON OFF Procedure 1 Connect to the GDM 8351 remotely see page 93 for remote control options 2 Enable the user mode using the DIGitalio MODE command See page 134 3 Set the state of pins 1 4 using the DIGitalio X SETup command See page 134 91 GW GDM 8351 User Manual Example 92 DIG MODE gt NORM DIG MODE USER DIG1 SETup ON DIG2 SETup ON DIG3 SETup ON DIG4 SETup ON DIG4 SETup gt 1 the mode Returns Norm mode Sets to USER mode Turns pin output Turns pin2 output on Turns pin3 output on Turns pin4 output on Queries pin4 output state Returns pin4 output state DIG MODE NORM Sets back to NORM mode GW INSTEK REMOTE CONTROL REMOTE CONTROL This chapter describes basic configuration of IEEE488 2 based remote control For a command list refer to the Command Overview chapter on page 100 Configure Remote Control Interface 94 USB Interface 2 ctn eet cortesia 94 Configure USB Interface 94 Configure RS232 95 Configure EOL
55. ctivate diode testing 2 The mode will switch to continuity testing immediately as shown below Display Continuity Continuity function state indicator NOM LUNI I LIN Im Connection Connect the test lead between the VQ dt terminal and COM terminal The display updates the reading vM SENSE Q4W VO gt t 600v 1 25A 1000V 48 GW INSTEK OPERATION Set Continuity Threshold The continuity threshold defines the maximum resistance allowed in the DUT when testing the continuity Range Threshold to 10000 Default Threshold 10Q Resolution 10 Procedure 1 Press MENU 2 Goto the MEAS menu on level 1 3 Go to the CONT menu on level 2 4 Set the continuity threshold level in ohms 5 Press the Enter key to confirm the continuity settings 6 Press EXIT to exit the CONT setting menu Display Continuity Continuity function setting indicator roM Peroni s 8 tL 49 GW INSTEK GDM 8351 User Manual Continuity Beeper Settings The beeper setting defines how the GDM 8351 notifies the continuity test result to the user Note When the Beeper setting is off it will also turn off the keypad tones as well as any error or warning tones Range PASS Beeps when
56. de immediately as shown below Capacitance Capacitance Measurement Display indicator units range a TF nc U IIL Connection Connect the test lead between the VO gt 4 terminal and COM terminal Positive V Negative COM The display updates the reading A N 7 SENSE INPUT SW Q4W V Q gt t FUSE Z CAT 600v ob E 46 GW INSTEK OPERATION Select the Capacitance Range The capacitance range can be set automatically or manually Auto Range To turn the automatic range selection On Off press the AUTO key Manual Range Press the Up or the Down key to select the range The AUTO indicator turns Off automatically If the appropriate range is unknown select the highest range Selectable Range Resolution Full scale Capacitance 10nF 10 12nF Ranges 100nF 100pF 120nF 1pF 1 1 2pF 10 10nF 12 100 100nF 120 N For further details please see the specifications on Note page 150 The refresh rate settings the EXT trigger Note cannot be used in the capacitance mode GW INSTEK GDM 8351 User Manual Continuity Test The continuity test checks that the resistance in the DUT is low enough to be considered continuous of a conductive nature Procedure 1 Press the key twice to activate continuity testing Note pressing the 9 key once will a
57. el 1 3 Go to TX EOL on level 2 4 Set the EOL character 5 Press Enter to confirm the EOL settings 6 Press EXIT to exit from the System menu Display TX EOL TX EOL menu setting indicator Tv CfA FILI E EUL L TLI RS232 Pin Pin 2 RxD 12345 Assignments Pin 3 TxD Pin 5 GND 59 Pin 1 4 6 9 6789 Connection 98 GW PC Connection GDM 8351 User Manual Use a Null Modem connection as shown in the diagram below DMM PC 2 RxD L3 RxD Pin2 Pin3 TxD TxD Pin3 5 GND GND Pins GW INSTEK REMOTE CONTROL Return to Local Control Background When the unit is in remote control mode the RMT icon above the main display can be seen When this icon is not displayed it indicates that the unit is in local control mode Procedure 1 Press the LOCAL 2ND key when in remote mode 2 The unit will go back into local mode and the RMT icon will turn off Display Remote control indicator DC AUTO 5 ids m d nnnmacr m HULL LIES n GW INSTEK GDM 8351 User Manual Com MAND OVERVIEW The Command overview chapter lists all programming commands in functional order as well as alphabetical order The command syntax section shows you the basic syntax rules you have to apply when using commands Command Syntax Compatible IEEE488 2 Partial compatibility Standard SCPI 1994 Partial compatibility Command SCPI Standard Commands for Programmable Str
58. ement Terminal terminal Accepts DC AC Current input For details see page 37 AMPS Fuse Holder DC 10mA 1A AC 10mA 1A FUSE 1 25A 1000V As a fuse protects the instrument from over current Rating T1 25A 1000V This terminal accepts DC AC current input For the fuse replacement procedure see page 143 DC AC 10A LO Wi High range current measurement Terminal terminal Accepts DC AC Current input For DCI or ACI details see 37 NCAT Il 600V INSTEK GETTING STARTED Sense HI Accepts HI sense line in 4W Terminal resistance measurement Sense LO Accepts LO sense line in 4W Terminal resistance measurement Measurement The top row of measurement keys are used for Keys basic DMM measurements such as voltage current resistance capacitance and frequency The bottom row of measurement functions are used for more advanced functions Each key has a primary and secondary function The secondary function is accessed in conjunction with the SHIFT key Upper Measurement keys DCV DCI Measures DC Voltage page 32 DCV DCI DCI Measures DC Current page SHIFT DCV 37 Measures Voltage page 32 ACV 15 GW INSTEK GDM 8351 User Manual ACI Cl Measures AC Current page 5 gt SHIFT c 37 DCV ACV e DC AC voltage DCI ACI Measures DC EXIT 2073 page 37 2W 4W TEMP Measures resistance 2W
59. er STATus QUEStionable EVENt Returns the contents of the Questionable Data Event register STATus PRESet Clears the Questionable Data Enable register Example STAT PRES Interface Commands SYSTem LOCal Enables local control front panel control and disables remote control SYSTem REMote Enables remote control and disables local control front panel control Local control can be recalled by pressing the 2ND or local button 135 GW INSTEK GDM 8351 User Manual SYSTem RWLock Enables remote control and disables local control front panel control Once this command has been issued pressing the 2ND or local buttons will not return the user to local control The only way to return local mode is to issue the SYSTem LOCal command IEEE 488 2 Common Commands CLS Clears the Event Status register Output Queue Operation Event Status Questionable Event Status Standard Event Status ESE Returns the ESER Event Status Enable Register contents Example ESE gt 130 Returns 130 ESER 10000010 ESE Sets the ESER contents Parameter lt NR1 gt 0 255 Example ESE 65 Sets the ESER to 01000001 ESR Returns SESR Standard Event Status Register contents Example ESR 2198 Returns 198 SESR 11000110 136 GW INSTEK COMMAND OVERVIEW IDN Returns the manufacturer model No serial number and system version number Example IDN gt GWInstek GDM8351 0000
60. f diod Square Brackets Commands that contain square brackets indicate that the contents are optional The function of the command is the same with or without the square bracketed items as shown below For example for the query SENSe UNIT Both SENSe UNIT and UNIT are valid forms Command CONFigure VOLTage DC 500 Format 1 Commandheader 3 Parameter 1 2 Space Common Type Description Example E boolean logic 0 1 NRI integers 0 1 2 3 NR2 decimal numbers 0 1 3 14 8 5 lt NR3 gt floating point with 4 5 1 8 25e 1 exponent lt NRf gt any of NRI 2 3 1 1 5 4 5e 1 MIN For commands this will set the Optional setting to the lowest value This parameter parameter can be used in place of any numerical parameter where indicated For queries it will return the lowest possible value allowed for the particular setting 102 GW INSTEK COMMAND OVERVIEW MAX For commands this will set the Optional setting to the highest value This parameter parameter can be used in place of any numerical parameter where indicated For queries it will return the highest possible value allowed for the particular setting Automatic The GDM 8351 automatically sets the command parameter range parameter to the next available value selection Example conf volt dc 2 This will set the measurement item to DC Voltage and the range to 10V There is no 2V range so the DMM selects the nex
61. gure commands setting 51 CONFigure2 commands Frequency Period input jack Measure commands Settings sienne emeret 80 Remote commands Front panel diagram 13 SENSe commands Fuse STA Tus report commands oa safety instruction 7 SYSTem related commandis 132 Ground TRIGger commands 129 25 symbol eaten 5 Continuity A Indicator beeper san readin 31 threshol dixe eas see an 49 8 Veris ene ME LEE Continui Input jack settings 80 ontinuity I 79 ios s Edd 48 nput resistance Main 11 GW GDM 8351 User Manual Marketing 505 Menu tree Period setting Power up Rear panel OVOFUIO W scena nodis ene ve 21 Refresh rate Remote control Command list 104 Command syntax 100 97 GPIB function check 94 interface configuration Replacing the AC source fuse 142 Replacing the input fuse 143 Resistance nier i 44 poen 42 Return from remote control 99 Safety instruction TUlSe 7 160 Serial 77 Service operation about disassembly 6 contact Specification
62. he Earth terminal marked with either the letter E the earth symbol or coloured Green Green amp Yellow 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 a 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 exposed wiring from a cable plug or connection that is engaged in a live socket is extremely hazardous If a cable or plug is deemed hazardous turn off the mains power and remove the cable any fuses and fuse assemblies All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard GW INSTEK GDM 8351 User Manual G ETTING STARTED This chapter describes the GDM 8351 multimeter in a nutshell including accessories and package contents its main features and front rear panel introduction Characteristics i ctio rrt eres 11 Accessories sacris en eenaa nin 12
63. ideline e N CAUTION Make sure that the voltage input level does not exceed DC1000V AC750V Make sure the current input level does not exceed 12A Do not place any heavy object on the instrument Avoid severe impact or rough handling that can lead to damaging the instrument Do not discharge static electricity to the instrument Use only mating connectors not bare wires for the terminals Do not block or obstruct the cooling fan vent opening Do not perform measurement at the source of a low voltage installation or at building installations Note below Do not disassemble the instrument unless you are qualified as service personnel Make sure that the COM terminal to earth is limited to 500Vpk Note EN 61010 1 2010 specifies the measurement categories and their requirements as follows The GDM 8351 falls under category 11 600 Measurement category IV is for measurement performed at the source of low voltage installation Measurement category III is for measurement performed in the building installation Measurement category Il is for measurement performed on the circuits directly connected to the low voltage installation a GW INSTEK SAFETY INSTRUCTIONS Power Supply AC Input voltage 100 120 220 240 V N 50 60Hz WARNING e The power supply voltage should not fluctuate more than 10 Connect the protective grounding conductor of the AC power cord to an earth ground to avoid
64. ing SUM INPUT m 79 INSTEK GDM 8351 User Manual Frequency Period Input Jack Settings The INJACK settings set which input terminal is used for frequency or period measurements Range Injack VOLT 1A 10A Default VOLT Procedure 1 Press the MENU key 2 Go to MEAS on level 1 3 Go to INJACK on level 2 4 Set the INJACK setting to either VOLT 1A or 10A 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the INJACK menu Display INJACK setting J GW INSTEK SYSTEM DISPLAY CONFIGURATION Digital Filter Digital Filter Overview Filter Basics The digital filter converts the analog input signal into digital format before passing it to the internal circuits for processing The filter affects the amount of noise included in the measurement result Filter Type The digital filter averages a specific number of input signal samples to generate one reading The filter type defines the averaging method The following diagrams show the differences between each filter type using 4 samples per reading as an example Moving Filter The moving filter takes in one new sample and discards the oldest sample per reading This is the default behavior when the digital filter is not specified and is recommended for most applications Pic reading Sample 3 6 2nd reading Sample 2 5 1st reading Sample 1 4 Sample 1 2 3 4 5 6 7 8 9 10 11 12 Repeating Filter
65. is navigated with the Up Down Left and Right arrow keys the Auto Enter key and the SHIFT EXIT key RANGE SHIFT RANGE To enter the menu system press the MENU key See page 140 for the System Menu tree dBm MENU e Pressing the Left and Right arrow keys will navigate to each of the menu items on the current menu level e Pressing the Down key will go down to the next level of the menu tree e Conversely pressing the Up key will allow you to go back to the previous menu level e Pressing Down or Enter on the last item in menu tree will allow you to edit the settings or parameters for that particular item or setting e Pressing the Exit key will allow you to exit from the current settings and return to the previous menu tree level GW INSTEK GETTING STARTED Editing a Setting When you access a menu or parameter setting or Parameter the Up Down Left and Right keys can be used again to edit the parameter as well RANGE Jfa setting or parameter is flashing it indicates that that particular parameter can be edited e Pressing the Left or Right arrow key will allow you to select a digit or character to edit e Pressing the Up or Down keys will allow you to edit the selected character 27 GW INSTEK GDM 8351 User Manual Operation Basic Measurement 30 Refresh Rate siete E bordes de 30 Reading Indicator
66. isplay Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 CURR DC gt 0 00856E 02 Returns the DC current measurement as 0 0856 mA MEASure2 CURRent AC Returns the AC current measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 CURR AC gt 0 01254E 02 Returns the AC current measurement as 0 1254mA MEASure2 RESistance Returns the 2W resistance measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 RES gt 1 05203E 03 Returns the 2W measurement 119 GW INSTEK GDM 8351 User Manual MEASure2 FRESistance Returns the 4W resistance measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 FRES gt 1 00023E 03 Returns the 4W measurement MEASure2 FREQuency Returns the frequency measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 FREQ gt 1 01122E 03 Returns the frequency 1 01122kHz MEASure2 PERiod Returns the period measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 PER MAX Returns the period at the maximum range SENSe Commands SENSe TEMPerature TCOuple TYPE Sets thermocouple type Parameter Type J K T Example SENS TEMP TCO TYPE J Sets the thermocouple to type J SE
67. l SENSe UNIT Sets the temperature unit Parameter C F Example SENS UNIT C Sets the temperature unit to C SENSe UNIT Returns the temperature unit SENSe FUNCtion 1 2 Sets the function for the first or second display Parameter display1 VOLT DC VOLT AC VOLT DCAC CURR DC CURR AC CURR DCAC RES FRES FREQ PER TEMP TCO DIOD CONT CAP display2 VOLT DC VOLT AC CURR DC CURR AC RES FRES FREQ PER NON Example SENS FUNCI VOLT DC Sets the 1 display to the DCV function SENSe FUNCtion 1 2 Returns the function displayed on the first or second display Return parameter display 1 VOLT VOLT AC VOLT DCAC CURR CURR AC CURR DCAC RES FRES FREQ PER TEMP TCO DIOD CONT CAP display 2 VOLT VOLT AC CURR CURR AC RES FRES FREQ PER NON 124 GW INSTEK COMMAND OVERVIEW CALCulate Commands CALCulate FUNCtion Sets the Advanced function Parameter OFF MIN MAX HOLD REL COMP DB DBM MXB INV REF Example CALC FUNC REL Sets the Advanced function to REL relative CALCulate FUNCtion Returns the current Advanced function CALCulate STATe Turns the Advanced function on off Parameter ON OFF Example CALC STAT OFF Turns the Advanced function off CALCulate STATe Returns the status of the Advanced function Return Parameter 0 1 1 ON 02OFF
68. l 2 4 Select the thermocouple type J K T 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the temperature menu Display Thermocouple Sensor menu type setting indicator 55 GW INSTEK GDM 8351 User Manual Set the Reference Junction Temperature When a thermocouple is connected to the DMM the temperature difference between the thermocouple lead and the DMM input terminal should be taken into account and be cancelled out otherwise an erroneous temperature might be added The value of the reference junction temperature should be determined by the user Range SIM 0 50 C default 23 00 C Resolution 0 01 C Procedure 1 Press the MENU key 2 Go to TEMP on level 1 3 Go to SIM on level 2 4 Set the SIM simulated reference junction temperature 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the temperature menu Display Reference junction SIM menu temperature setting indicator TIM 3111 C ICH 56 INSTEK Dual Measurement Overview The dual measurement mode allows you to use the 2nd display to show another item thus allowing you to view two different measurement results on the screen When the multimeter is used in dual measurement mode both displays are updated from either a single measurement or from two separate measurements If the primary and secondary measurement modes have the same
69. l Measurement 57 Supported dual measurement modes 57 Using Dual Measurement 58 Advanced Measurement Overview 62 Supported Advanced Measurement Functions 62 dBm dB W 2 2 2 2 63 2 2 63 Measuring dBM W erint rtt 63 Measure dB RU edere 65 Max Min Measurement cesses eene 66 Relative 67 Hold Measurement 2 2 69 Compare Measurement 1 70 Math 72 Math Measurement 72 Measure 4442222221 72 Measure 1 X timete 73 Measure Percentage 74 29 GW INSTEK GDM 8351 User Manual Basic Measurement Overview Refresh Rate Background The refresh rate defines how frequently the DMM captures and updates measurement data A faster refresh rate yields a lower accuracy A slower refresh rate yields a higher accuracy Consider these tradeoffs when selecting the refresh rate For further details please see the specifications Refresh ra
70. ltage Dip Interruption N 61000 4 11 2004 Low Voltage Equipment Directive 2006 95 Safety Requirements EN 61010 1 2010 EN 61010 2 030 2010 158 GW INSTEK INDEX 2 12 Conventions esee 25 Advanced measurement Current COImpatG oreet eyes 70 EE E E ee 39 E 37 Declaration of conformity 158 Digital I O 88 Normal mode 90 220250 89 User mode 91 Diode 45 Display overview 19 Disposal instructions 8 relative Dual measurement supported functions 57 Brightness level 57 Cancel remote control 99 EN61010 Capacitance measurement 6 47 pollution 8 setting 46 Environment Caution symbol 5 safety instruction sss 7 Cleaning the instrument 7 Factory default settings Command IEEA88 2 commands136 85 Command set Factory default settings 141 CALCulate commandis Frequency CONFi
71. n set to external the DMM will wait for an external trigger signal from the Digital I O port or from the TRG command See page 88 amp 138 for more details Trigger Settings Range Trigger INT EXT Procedure 1 Press the MENU key 2 Go to MEAS on level 1 3 Go to TRIG on level 2 4 Set the TRIG setting to either INT or EXT 5 Press the Enter key to confirm 6 Press the EXIT key to exit from the TRIG menu Display INJACK setting Lyd cI 86 GW INSTEK SYSTEM DISPLAY CONFIGURATION External Trigger The external trigger uses the digital I O pin for manual triggering of the DMM Pin 5 of the digital I O port is normally high To trigger the DMM a low pulse of 210ps is needed The TRG command can also be used to externally trigger the DMM when the DMM is in the external trigger mode See page 138 for details Digital 1 Pin 5 Trigger input lt gt 10 6 Digital I O Terminal Pin 6 GW INSTEK GDM 8351 User Manual Dictat Digital JO Overview iei 89 Normal 90 User Mode eee elt 91 88 GW INSTEK DIGITAL I O Digital O Overview The Digital I O port is a dual function port By default Normal Mode the port is used with the compare function to output Hi Fail Lo Fail Pass and EOM end of measurement signals In addition there is also TRIG IN input pin As a sec
72. nction stores the highest maximum or lowest minimum reading and shows it on the 1st display when the 2ND key is pressed Applicable The Max Min function can be used with the measurements following basic measurement functions ACV DCV ACI DCI Hz P TEMP 48 Procedure For Max measurement press the MX MN key once For Min measurement press the MX MN key twice Display Basic meas Max Min Measurement function indicator range nanc 7 OCHJI dg View Max Min Press the 2ND key to view the Max or Min Value value Display Max Min Max Min reading mode AC MAX H3JnE TT EMRA LLE LIC Il Deactivate Hold the MX MN key for two seconds to Max Min deactivate or simply activate another Measurement measurement function 66 GW INSTEK OPERATION Relative Measurement Relative measurement stores a value typically the data at that instant as the reference The measurement following the reference is displayed as the delta between the reference The reference value will be cleared upon exiting Applicable The relative function can be used with the measurements following basic measurement functions ACV DCV ACI DCI Hz P TEMP 1t Procedure Press the REL key The measurement reading at that instant becomes the reference value Display Relative CR value 9 REL NOAM LILILILILIL View Relative Press the 2ND key to view the relative reference Reference Value value at full scale Di
73. ncy 1 00123kHz 117 GW INSTEK GDM 8351 User Manual MEASure PERiod Returns the period measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS PER MAX Returns the period at the maximum range MEASure CONTinuity Returns the continuity measurement on the first display Example MEAS CONT Returns the continuity MEASure DIODe Returns the diode measurement on the first display Example MEAS DIOD Returns the diode measurement MEASure CAPacitance Returns the capacitance measurement on the first display Example MEAS CAP Returns the capacitance measurement MEASure TEMPerature TCOuple Returns the temperature for the selected thermocouple type on the first display Parameter NONE J K T Example MEAS TEMP TCO J gt 0 02667E 03 Returns the temperature measurement 118 GW INSTEK COMMAND OVERVIEW MEASure2 VOLTage DC Returns the DC voltage measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 VOLT DC gt 0 10321E 01 Returns the DC voltage measurement as 0 010321V MEASure2 VOLTage AC Returns the AC voltage measurement on the second display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS2 VOLT AC gt 0 10020E 01 Returns the AC voltage measurement as 0 010020V MEASure2 CURRent DC Returns the DC current measurement on the second d
74. ns the range of the current function on the second display Return parameter DCV 0 1 100mV 1 1V 10 10V 100 100V 1000 1000V ACV 0 1 100mV 1 1V 10 10V 100 100V 750 750V ACI 0 01 10mA 0 1 100mA 1 1 10 10A DCI 0 01 10mA 0 1 100mA 1 1A 10 10A RES 10 1 100 Q 10E 2 1kQ 10E 3 10k Q 10E 4 100k 9 10E 5 1M 10E 6 10M Q 10E 7 100M FRES 10E 1 100 Q 10E 2 1kQ 10E 3 10k 10E 4 100k Q 10E 5 1M 10E 6 10M Q 10 7 100 CONFigure2 AUTO Sets Auto Range on or off on the 2nd display Parameter ON OFF Example CONF2 AUTO ON CONFigure2 AUTO Returns the Auto Range status of the function on the 2nd display Return Parameter 0 1 1 Auto range 0 Manual range 115 GW INSTEK GDM 8351 User Manual Measure Commands MEASure VOLTage DC Returns the DC voltage measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS VOLT DC gt 0 10348E 01 Returns the DC voltage measurement as 0 010348 V MEASure VOLTage AC Returns the AC voltage measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS VOLT AC gt 0 09020E 01 Returns the AC voltage measurement as 0 009020V MEASure VOLTage DCAC Returns the DC AC voltage measurement on the first display Parameter None Range lt NRf gt MIN MAX DEF Example MEAS VOLT DCAC gt 0 1
75. nt range for frequency period measurements can be set to Auto range or to manual By default the voltage current range is set to Auto for both the period and frequency Range Voltage 100 1V 10V 100V 750V Current 10 100mA 10A N Note The input jack setting determines whether the voltage frequency period or current frequency period is being measured See page 80 for details Manual Range Set the range with the Up and Down keys The AUTO indicator will turn off when a new range is selected Autorange 1 Press the Auto Enter key 2 AUTO will be displayed on the screen again Display Autorange Voltage Current indicator range setting gt Note Pressing the 2nd key twice will toggle the view of the second display between the voltage current range and the menu function FREQ or PERIOD Note that the voltage current range can actually still be set even when the secondary display has been toggled to show the menu function 52 GW INSTEK OPERATION Temperature Measurement The GDM 8351 can measure temperature using a thermocouple To measure temperature the DMM accepts a thermocouple input and calculates the temperature from the voltage fluctuation The thermocouple type and reference junction temperature are also considered Temperature Thermocouple 200 C 300 C Range amp Type Tips LKT Procedure To make temperature measurements press SHI
76. offset in the same fashion as the M factor was edited 5 Press Enter to confirm the B offset setting and to begin the MX B measurement Display meausurement MX B math reading indicator AC AUTO nano HEU to Deactivate Math Press SHIFT MX MN MATH to deactivate Measurement the MATH function or simply activate another measurement function Measure 1 X Procedure 1 Press SHIFT gt MX MN MATH to enter the MATH menu The MX B setting appears 2 Press the Down key twice to skip past MX B settings and go to the 1 X settings 1 X will be flashing in the secondary display 73 GW INSTEK GDM 8351 User Manual I v 1 I 1 LE JL 3 Press Enter to activate the 1 X math function The results begin immediately Display 1 X 1 X math measurement indicator AC AUTO 5 vl Uf IE tt t Deactivate Math Press the SHIFT gt MX MN MATH to Measurement deactivate the MATH function or simply activate another measurement function Measure Percentage Procedure 1 Press SHIFT MX MN to enter the MATH menu 2 MX B setting appears Press the Up key to skip past MX B settings and go to the REF settings will be flashing in the secondary display 3 Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decimal point Use the Up and Down arrow keys to edit the selected digit or
77. ondary function User Mode the Digital I O port can have the output state of pins 1 4 controlled via remote control Pinout DIGITAL 1 0 0 75 8 8 6 6 0 Pin Normal Mode User Mode 1 High Fail Set 1 2 Low Fail Set 2 3 Pass Set 3 4 EOM Set 4 5 TRIG IN TRIG IN 6 Ground Ground 89 GW INSTEK GDM 8351 User Manual Wiring Diagram Pins 1 4 are open collector outputs with a Pins 1 4 max input of 30mA outputs are active low Digital Ext Vcc Terminal Pin 1 4 Imax 30mA Wiring Diagram Digital Pin 5 Pins gt lt Trigger input Pin 6 Normal Mode Overview The Normal Mode outputs the pass fail results of the Compare function Each signal is an active low signal In addition an active low pulse of approximately 5us is output to indicate the end of compare measurement EOM When the input signal exceeds the high threshold or the low threshold the High Fail or Low Fail pin is pulled low When the signal stays within the threshold levels the Pass pin is pulled low 90 GW INSTEK DIGITAL I O Timing Diagram High limit Compare Off Low limit Pin 1 4 Pin 1 Output H HIGH FAIL Pin 2 LOW FAIL T Pin 3 PASS 0 User Mode User mode can only used when using a remote
78. or 4W See page 42 TEMP TEMP Measures temperature See SHIFT gt SHIFT BAN page 53 2W 4W EXIT gt fon alls Measures diodes or continuity depending on the selected mode See page 45 and 48 respectively 16 At Measures capacitance See SHIFT page 46 Hz P dB Measures the frequency or period of a signal depending on the selected mode See page 51 dB dB Measures dB See page 65 SHIFT Hz P 3 GW INSTEK GETTING STARTED 2ND As the 2nd key selects the measurement item on the 2nd display page 57 Pressing and holding for more than 1 second turns off the 2nd display 2ND As the Local key releases the unit from remote control and returns the instrument to local panel operation page 97 Lower Measurement keys REL REL Measures the Relative value page REL 67 REL REL Manually sets the reference SHIFT REL oe value for the Relative value measurement MX MN MATH Measures the Maximum or the Wh Minimum value page 66 MATH MATH Enters the Math SHIFT gt wom measurement mode The MX MN sy supported math functions include MX B REF and 1 X See page 72 for details HOLD COMP Activates the Hold function page HOLD 69 17 GW INSTEK GDM 8351 User Manual COMP SHIFT HOLD SHIFT EXIT LE FILTER TYPE FILTER TYPE SHIFT FILTER SHIFT EXIT T MENU dBm dBm Activates the compare ROT measurement function See page 70 Turns the
79. rameter None MIN MAX 130 GW INSTEK COMMAND OVERVIEW TRIGger COUNt Sets the number of trigger counts Parameter lt NR1 gt 1 9999 MIN MAX Example TRIG COUN 10 Sets the number of trigger counts to 10 TRIGger COUNt Returns the number of trigger counts Parameter None MIN MAX 131 GW INSTEK GDM 8351 User Manual SYSTem Related Commands SYSTem BEEPer STATe Selects the beeper mode no beep beep on fail and beep on pass Parameter lt NR1 gt 0 1 2 0 beep 2 fail 1 pass Example SYST BEEP STAT 0 Turns the beeper off SYSTem BEEPer STATe Returns the beeper mode Return parameter Beep on Pass Beep on Fail No Beep SYSTem BEEPer ERRor Sets the beeper to sound on an SCPI error Parameter ON OFF Example SYST BEEP ERR ON Allows the beeper to sound when an SCPI error occurs SYSTem BEEPer ERRor Returns the beeper error mode Return parameter 0 1 0 1 ON SYSTem BEEPer Issues a single beep Parameter NONE SYSTem ERRor Returns the current system error if any SYSTem VERSion Returns system version Return Parameter X XX 132 GW INSTEK COMMAND OVERVIEW SYSTem DISPlay Turns the Display on off Parameter ON OFF Example SYST DISP ON Turns the display on SYSTem DISPlay Returns the status of the display Return parameter 0 1 0 1 SYSTem SERial Returns the serial number nine character
80. range rate and rely on the same fundamental measurement then a single measurement is taken for both displays such as ACV and frequency period measurements If the primary and secondary displays use different measurement functions ranges or rates then separate measurements will be taken for each display For example ACV and DCV measurements Most of the basic measurement functions except for resistance continuity can be used in the dual measurement mode Supported dual measurement modes The following table lists all the measurement functions that are supported with the dual measurement function Supported Dual Primary Secondary Display Measurement Display DCV ACI DCI Hz P Q modes ACV e e e e e X DCV X X ACI X DCI x x e X X Hz P 7 X X X X X X X X e 57 GW INSTEK GDM 8351 User Manual Using Dual Measurement Mode Procedure 1 Choose one of the basic measurement functions from the table above to set the measurement mode for the primary display For example press DCV to set the first display to DCV measurement 2 To set a measurement mode for the second display press the 2ND key and then select the second measurement mode For example press 2ND SHIFT to select ACI measurement for the second display Display Indicators for 15 274 measurement measurement and unit p ductu ni nou eee 4 Hoo 1 measurement Indicators for 2 and uni
81. ress MENU 3 Go to I O on level 1 4 Go to USB on level 2 Connect the USB cable to the rear panel type B 5 Select USB CDC or USB TMC Display USB class setting uem Configure RS232 Interface USB menu indicator RS232 Selectable Baud rate Configuration Parity Hardware flow control Data Bits Stop bit 9600 19200 38400 57600 115200 None Off 8 1 Steps port 1 Connect the RS232 cable to the rear panel RS232 95 GW GDM 8351 User Manual Display RS232 Pin Assignments Pc Connection 96 2 Press MENU 3 Go to I O on level 1 4 Go to RS232 on level 2 and press Enter 5 The baud rate settings appear Set the baud rate 6 Press Enter to confirm the RS232 settings 7 Press EXIT to exit from the System menu Baud rate BAUD menu setting indicator nmn ALI LILI Pin 2 RxD Pin 3 TxD Pin 5 GND Pin 1 4 6 9 6789 Connection Use a Null Modem connection as shown in the diagram below DMM PC Pin2 RxD Lz RxD Pin2 Pin3 TxD TxD Pin3 Pin5 GND GND Pins GW INSTEK REMOTE CONTROL Configure EOL Character Overview The TX EOL settings set the EOL end of line character for return messages The EOL characters that can be received from a PC include CR LF CR LF or LF CR with CR LF being the most common EOL Characters CR LF LF CR CR LF Steps 1 Press MENU 2 Go to TX TERM on lev
82. s Status System menu tree 140 Temperature reference junction temperature 56 selecton cs cien somit 53 SOU 53 LM iiie esse Heus 56 thermocouple 55 INES NO 54 Tilt stand acoieoiies 23 Trigger settings 86 Triggering M 31 UK power 9 Version number 77 Voltage comparison table 35 rest 36 TANGO 33 32 Warning symbol 5
83. s numbers INPut IMPedance AUTO Sets the input impedance for DCV mode 100mV range and 1V range Parameter ON 10G OFF 10M Example INP IMP AUTO ON Turns the Automatic input impedance on IN Put IMPedance AUTO Returns the input impedance mode Return parameter lt Boolean gt 0 1 O OFF 10M 1 ON 10G DISPlay TEXT Write a message to the display Parameter Text can contain alphanumeric characters including spaces up to 13 characters Example DISP TEXT DMM TEST Write DMM TEST to the display DISPlay TEXT Returns the displayed message 133 GW INSTEK GDM 8351 User Manual DISPlay TEXT CLEar Clear message from display Parameter NONE Example DISP TEXT CLE DIGitalio MODE Sets the mode for Digital I O Parameter NORM USER Example DIG MODE NORM Sets the Digital I O Mode to normal DIGitalio MODE Returns the Digital I O mode Return parameter NORM USER DIGitaliof 1 2 3 4 SETup Sets the status for Digital I O only for user mode Parameter ON OFF Example DIG1 SET ON DIGitalio 1 2 3 4 SETup Returns the Digital I O status only for User mode Return parameter 0 1 0 1 ON 134 GW INSTEK COMMAND OVERVIEW STATus Report Commands STATus QUEStionable ENABle Set bits in the Questionable Data Enable register STATus QUEStionable ENABle Returns the contents of the Questionable Data Enable regist
84. s chosen with the Auto range function may be too small GW INSTEK GDM 8351 User Manual For example A C D Dynamic Range OV Dynamic Range B E A B Input exceeds the dynamic range C D The DCV offset causes the input to exceed the upper dynamic range E The DCV offset causes the input to exceed the lower dynamic range The DC voltage range should be manually selected when all of the following conditions are true When measurement is used When the signals being measured contain both DC and AC components e When the amplitude of the AC component in the measured signal is higher or lower than the dynamic range of the range being currently selected by the auto range function Maximum DCV Selected DCV Range Dynamic Range Dynamic 180mVmax DC1V 1 8Vmax DC 10 18Vmax DC 100V 180Vmax DC 1000V 1000Vmax 34 GW OPERATION Voltage Conversion Table This table shows the relationship between an AC and DC reading for various waveforms Waveform Peak to Peak True RMS DC Sine 2 828 1 000 0 000 PK PK Rectified Sine full wave 1 414 0 435 0 900 Rectified Sine half wave 2 000 0 771 0 636 NN PK PK Square 2 000 1 000 0 000 PK PK Rectified Square 1 414 0 707 0 707 Rectangular Pulse 2 000 2K 2D Al 2 X PK PK um D X Y evo DANY Triangle Sawtooth 3 464 1 000 0 000 NE 35 GW INSTEK GDM 8
85. seeeeee 112 112 CONFigure AUTO 0 eee cseeeeeececsesenenenenees 112 Configure Commands Display 2 CONFigure2 VOLTage DC 113 2 113 2 113 2 113 2 51 114 2 114 2 114 2 114 2 114 CONFigure2 FUNCtion 115 2 115 2 2 2 115 115 GW COMMAND OVERVIEW Measure Commands Sense Commands 116 5 116 116 MEASure CURRent DC 116
86. splay Relative reference value AC 5 REL sti 67 GW GDM 8351 User Manual Manually Set the 1 Relative Reference Value To manually set the relative reference value press SHIFT gt REL REL The REL value is displayed on the screen at full scale Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decimal point Use the Up and Down arrow keys to edit the selected digit or to place the position of the decimal point Press the Enter key to confirm alternatively press Exit to cancel setting the relative reference value Display Relative REL setting value setting mode ri nis l Deactivate Press the REL key again to deactivate the Relative Relative measurement mode or simply activate Measurement another measurement function 68 GW INSTEK OPERATION Hold Measurement The Hold Measurement function retains the current measurement data and updates it only when it exceeds the set threshold as a percentage of the retained value Applicable The hold function can be used with the measurements following basic measurement functions ACV DCV ACI DCI Hz P TEMP Procedure 1 Press the HOLD key 2 The measurement reading appears on the primary display and the hold threshold on the secondary display Display Measurement Hold reading threshold AC OLD 772 LLE LI 3
87. t available range 10V Message Remote Marks the end of a command Terminator EOL Command line The following messages are in accordance with 488 2 standard LF CR CR LF most LF CR common EOL character is CR LF Message EOL or Command Separator Separator semicolon 103 GW INSTEK GDM 8351 User Manual Command List Configure Commands Display 1 CON Figure VOLTage DC 109 109 109 109 110 110 110 110 111 111 CONFigure CONTinuity esee 111 CONFigure DIODe sese 111 CONFigure TEMPerature TCOuple 111 CONFigure CAPacitance 112 CONFigure FUNCtion sss 112 CONFigure RANGe ssssssss
88. t NRf gt MIN MAX DEF Example CONF FREQ MAX Sets the frequency measurement range to max CONFigure PERiod Sets measurement to Period on the first display and specifies the range Parameter None Range lt NRf gt MIN MAX DEF Example CONF PER Sets the DMM to period measurement using the autorange CONFigure CONTinuity Sets measurement to Continuity on the first display Parameter None CONFigure DIODe Sets measurement to Diode on the first display Parameter None CONFigure TEMPerature TCOuple Sets measurement to Temperature thermocouple on the first display Parameter None Type J K T Example CONF TEMP TCO J Sets the measurement mode to TCO with a type J sensor 111 GW INSTEK GDM 8351 User Manual CONFigure CAPacitance Sets measurement to Capacitance on the first display Parameter None Range lt NRf gt MIN MAX DEF Example CONF CAP 10E 6 Sets the measurement mode to Capacitance with a 10pF Range CONFigure FUNCtion Returns the current function on the first display Return parameter VOLT VOLT AC VOLT DCAC CURR CURR AC CURR DCAC RES FRES FREQ PER TEMP DIOD CONT CAP CONFigure RANGe Returns the current range on the first display Return Parameter DCV 0 1 100mV 1 1V 10 10V 100 100V 1000 1000V ACV 0 1 100mV 1 1V 10 10V 100 100V 750 750V ACI 0 01 10mA 0 1 100mA 1 1A 10 10A DCI 0 01 10mA 0 1 100mA 1 1A 1
89. t measurement GW INSTEK OPERATION Editing the After the secondary measurement function has Measurement been activated the rate range and Parameters measurement item can be edited for either the primary or secondary display Note however it is more practical to configure the first or second measurement items before activating dual measurement mode To edit measurement parameters in dual measurement mode you must first set which display is the active display The 2ND icon under the secondary display determines which display is the active display Procedure 1 Toggle whether the primary or secondary display is the active display by pressing the 2ND key Primary display is the active display 2ND is not visible on the display Secondary display is the active display 2ND is visible on the display N Do not hold the 2ND key This will turn the dual Note measurement mode off 2 Edit the range rate or measurement item for the active display in the same way as for single measurement operation See the Basic Measurement chapter for details page 30 Turn Off 2nd To turn Off the 2nd measurement press and Measurement hold the 2nd key for more than 1 second 59 GW GDM 8351 User Manual Connection The diagrams below describe how to connect the DMM to measure a number of common dual measurement items Voltage and Frequency Period measurement Y SENSE Q4
90. te Function S M F Reading 3 Continuity Diode 10 40 320 DCV DCI 10 40 320 ACV ACI 10 40 320 Frequency Period 1 98 83 Temperature 10 40 320 2 4 0 10 40 320 Capacitance 2 2 2 Steps 1 Press the left or right arrow keys to change the refresh rate 2 The refresh rate will be FoMes shown at the top of the display N The refresh rate cannot be set for capacitance Note measurement 30 GW INSTEK OPERATION Reading Indicator Overview 1 The reading indicator next to the 1st display flashes according to the refresh rate setting HHhnaB LILILLLI tll Automatic Manual Triggering Overview By default the GDM 8351 automatically triggers according to the refresh rate See the previous page for refresh rate setting details The TRIG IN pin of the digital I O port or the TRG remote command can be used to manually trigger acquisition when the trigger mode is set to EXT See page 86 for trigger setting details N Manual triggering is not supported for capacitance Note measurements GW INSTEK GDM 8351 User Manual AC DC Voltage Measurement The GDM 8351 can measure up to 750VAC or 1000VDC however the CATII measurement is only rated up to 600V Set to ACV DCV 1 Press the DCV or ACV key to measure DC or Measurement AC voltage For AC DC voltage press the ACV and DCV keys at the same time 2 The mode will switch to AC DC or AC DC mode immediately as shown below AC amp DC Voltage Me
91. to the maximum allowed CALCulate DB REFerence Returns the reference voltage from the dB function CALCulate DBM REFerence Sets the resistance value for the dBm function Parameter lt NRf gt MIN MAX Example CALC DBM REF MAX Sets the resistance value for dBm measurements to the maximum allowed CALCulate DBM REFerence Returns the resistance value from the dBm function CALCulate MATH MMFactor Sets the scale factor M for math measurements Parameter lt NRf gt MIN Example CALC MATH MMF MIN Sets the scale factor M to the minimum allowed value CALCulate MATH MMFactor Returns the scale factor M used in the math measurement 127 GW INSTEK GDM 8351 User Manual CALCulate MATH MBFactor Sets the offset factor B for math measurements Parameter lt NRf gt MIN MAX Example CALC MATH MBF MIN Sets the offset factor B to the minimum allowed value CALCulate MATH MBFactor Returns the offset factor B used in the math measurement CALCulate MATH PERCent Sets the reference value for the Percent function Parameter lt NRf gt MIN MAX Example CALC MATH PERC MAX Sets the reference value for the Percent function to the maximum CALCulate MATH PERCent Returns the reference value setting for the Percent function 128 GW INSTEK COMMAND OVERVIEW TRIGger Commands READ Returns 1 and 2 4 display value 1 SAMP COUN 4 USBTMC
92. ucture Instruments commands follow a tree like structure organized into nodes Each level of the command tree is a node Each keyword in a SCPI command represents each node in the command tree Each keyword node of a SCPI command is separated by a colon For example the diagram below shows an SCPI sub structure and a command example CONFigure CONFigure VOLTage DC VOLTage DC DCAC 100 GW INSTEK COMMAND OVERVIEW Command Types There are a number of different instrument commands and queries A command sends instructions or data to the unit and a query receives data or status information from the unit Command types Simple A single command with without a parameter Example CONFigure VOLTage DC Query A query is a simple or compound command followed by a question mark A parameter data is returned Example CONFigure RANGe Command Forms Commands and queries have two different forms long and short The command syntax is written with the short form of the command in capitals and the remainder long form in lower case The commands can be written either in capitals or lower case just so long as the short or long forms are complete An incomplete command will not be recognized Below are examples of correctly written commands Long form CONFigure DIODe CONFIGURE DIODE Configure diode 101 GW INSTEK GDM 8351 User Manual Short form CONF DIOD con
93. used by condensation must be expected e Pollution degree 3 Conductive pollution occurs or dry non conductive pollution occurs which becomes conductive due to condensation which is expected In such conditions equipment is normally protected against exposure to direct sunlight precipitation and full wind pressure but neither temperature nor humidity is controlled Storage Location Indoor environment Temperature 40 C to 70 C e Humidity 0 35 C lt 90 RH gt 35 C lt 80 RH Disposal Do not dispose this instrument as unsorted municipal waste Please use a separate collection facility or contact the supplier from which this instrument was purchased Please make sure discarded electrical waste is properly recycled to reduce environmental impact GW INSTEK SAFETY INSTRUCTIONS Power cord for the United Kingdom When using the unit in the United Kingdom make sure the power cord meets the following safety instructions 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 OF Blue Neutral Brown Live Phase As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug appliance proceed as follows The wire which is coloured Green amp Yellow must be connected to t
94. ve the high limit HIGH will be displayed Display Measurement Compare reading result j E Fna3 LEID tl cone Deactivate Press SHIFT HOLD COMP to deactivate Compare compare measurements or simply activate Measurement another measurement function 71 GW INSTEK GDM 8351 User Manual Math Measurement Math Measurement Overview Math measurement runs three types of mathematical operations MX B 1 X and Percentage based on the other measurement results Applicable The math function can be used with the Measurements following basic measurement functions ACV DCV ACI DCI O Hz P TEMP Overview of Math Multiplies the reading X by the Functions factor M and adds subtracts offset B 1 X Inverse Divides 1 by the reading 9 Percentage Runs the following equation Reading X Reference Reference x 100 Measure MX B Procedure 1 Press SHIFT MX MN MATH to enter the MATH menu The MX B setting appears The M factor will be flashing indicating that the M factor is to be set 2 Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decimal point Use the Up and Down arrow keys to edit the selected digit or to place the position of the 72 GW INSTEK OPERATION decimal point 3 Press Enter to confirm the M factor settings and to automatically move onto the B offset setting 4 Edit the B
95. wn as Short Aperture The short aperture includes both the charge and discharge time of the capacitor As measuring capacitance with the DMM is effectively a DC measurement it will differ from the capacitance measured with an LCR as that will measure the capacitance at certain frequencies For best measurement results first perform a zeroing of the test leads when the cables are open to compensate for the test lead capacitance Measurement Noise Rejection DC Common mode reject ratio DC CMRR For 1 kQ unbalanced LO lead 50 60 Hz 0 1 DC gt 90 dB 155 GW INSTEK GDM 8351 User Manual Temperature Coefficients Specified ambient temperature range accuracy is typically within the calibration temperature Tcal 5 C range If the operating environment of the multimeter is within 0 C to Tcal 5 C or Tcal 5 C to 50 C specification units C you must add the additional temperature coefficient errors to the accuracy specifications Temperature Coefficient add 0 15 x the applicable accuracy C GW INSTEK APPENDIX Dimensions GDM 8351 LLL THU Lo Au T Units mm P

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