Gw-instek GDM-8261 User Manual User Manual

Dual Measurement Multimeter GDM-8261 USER MANUAL GW INSTEK PART NO. 82DM-82610EB1 ISO-9001 CERTIFIED MANUFACTURER

GDM-8261 User Manual 10 GETTING STARTED This chapter describes the GDM-8261 in a nutshell, including an Overview of its main features and front /

GDM-8261 User Manual 100 1st display Shows the memory number 4. Select the memory number using the Up/Down key. 5. Press the Enter key to

SCANNER (OPTIONAL) 101 SCANNER (OPTIONAL) The optional scanner, GDM-SC1, lets you effectively measure multiple channels connected to a single

GDM-8261 User Manual 102 GDM-SC1 Scanner Specifications 2-wire channel 16 pairs Maximum current 2A (ch17, ch18) 4-wire channel 8 pairs Resistance

SCANNER (OPTIONAL) 103 3. The connection terminals are revealed. Overview 16 general purpose channels are available, 8 on the left row,

GDM-8261 User Manual 104 Temp. 2W RTD 2 wires (H, L) 16 (CH1 ~ 16) Temp. 4W RTD 4 wires (Input H, L + Sense H, L) 8 pairs (CH1 [input]& 9[se

SCANNER (OPTIONAL) 105 Enable scanner (Jumper J9) Set the jumper J9 on the rear side of the board accordingly. Move the jumper up (pins 3-2)

GDM-8261 User Manual 106 2. Route the wires as shown below via the two openings (left and right) at the front cover. 3. Bundle the wires at

SCANNER (OPTIONAL) 107 Insert Scanner Power Off Turn the Power Off and take out the power cord. Open the GDM-8261 rear panel slot Take o

GDM-8261 User Manual 108 Insert the scanner Insert the scanner bottom-side-up (already configured according to the procedures on page 102) into th

SCANNER (OPTIONAL) 109 Scanner Configuration Record Channel Wire color Measurement type Note CH1 H L CH2 H L CH3 H L CH4 H L CH5 H L

GETTING STARTED 11 GDM-8261 Characteristics The GDM-8261 is a portable, dual-display digital multimeter suitable for a wide range of applicat

GDM-8261 User Manual 110 Setup Scan Overview Scan type Simple Sets the scanned channel range, loop count, and timer length. All channels have a c

SCANNER (OPTIONAL) 111 Step Measures a single channel in the specified range (Channel MIN~MAX)at each trigger event. Timer settings (page 112

GDM-8261 User Manual 112 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. HOLD TRIG Ra

SCANNER (OPTIONAL) 113 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. HOLD TR

GDM-8261 User Manual 114 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. HOLD TRIG Ra

SCANNER (OPTIONAL) 115 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. HOLD TR

GDM-8261 User Manual 116 Use External Trigger Background The GDM-8261 uses the internal trigger by default. Using an external trigger allows cust

SCANNER (OPTIONAL) 117 Run Scan Overview Scan operation type Scan Measures all the specified channel ranges at each trigger event. The timer

GDM-8261 User Manual 118 Recall Scan/Step Result Panel operation 1. After the Scan/Step is completed, the data is stored internally. Press the S

SCANNER (OPTIONAL) 119 3. Press the Down key. The channel selection appears. 4. Move the cursor to the channel using the Left/Right k

GDM-8261 User Manual 12 Front Panel Overview Measurement KeysInput Hi TerminalSense Hi TerminalSense Lo,DC/AC 1A TerminalPower SwitchMain DisplayD

GDM-8261 User Manual 120 DIGITAL I/O The rear panel Digital I/O terminal outputs the result of Compare measurements to external devices. HOLDCOMP

DIGITAL I/O 121 Digital I/O Terminal Configuration Background The digital I/O terminal outputs the result of Compare measurements to control

GDM-8261 User Manual 122 Pin6 FAIL signal Output. Activates when the compare result is FAIL. Pin7 HIGH Limit FAIL signal Output. Activates when

DIGITAL I/O 123 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to the low limit sett

GDM-8261 User Manual 124 Digital I/O: FAIL Out (Pin 6) and LOW Limit FAIL Out (Pin 8) are activated. Pass If the 2nd display shows Pass, the r

DIGITAL I/O 125 Application: External trigger Background The GDM-8261 uses the internal trigger by default, for example to count the frequenc

GDM-8261 User Manual 126 2. Start trigger Press the Trig key to start triggering manually. The indicator turns On. VmSAUTOAC TRIG Reading indic

REMOTE CONTROL 127 REMOTE CONTROL Interface Overview ... 129 Configure USB Inter

GDM-8261 User Manual 128 TRIGger Commands ... 194 SYSTem Related Commands ...

REMOTE CONTROL 129 Configure Interface Overview Interface type USB Device USB 1.1 or 2.0, TypeA, female connector. RS-232C D-sub 9 pin, male

GETTING STARTED 13 Sense HI Terminal W4WSENSE Accepts HI sense line in 4W resistance measurement. For details, see page 33. Input Lo Terminal

GDM-8261 User Manual 130 3. Press the Down key. The USB ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. 5. Press

REMOTE CONTROL 131 4. Press the Down or UP keys repeatedly to select the baud rate. 2304001152005760038400192009600 5. Press the E

GDM-8261 User Manual 132 2. Press the Down key. The EOL menu appears. 3. Press the Down key. The EOL selection menu appears. 4. Pres

REMOTE CONTROL 133 2. Press the Down key and then the Right key. The SEP selection display appears. TRIG 3. Press the Down key. The SEP

GDM-8261 User Manual 134 V+U+C Value, Unit, Count# +0.503E-4, V DC, +00001# Configuration 1. Press the Shift key, the 2nd (Menu) key, the left ke

REMOTE CONTROL 135 Insert GPIB Card Power Off Turn the Power Off and take out the power cord. Open the GDM-8261 optional communication p

GDM-8261 User Manual 136 Power On Connect the power cord and turn On the power. Configure GPIB Interface GPIB port configuration 1. Press th

REMOTE CONTROL 137 5. To continue to the GPIB address configuration, press the Enter key. The GPIB address configuration menu appears. AUTOE

GDM-8261 User Manual 138 9 IFC 21 Ground (IFC) 10 SRQ 22 Ground (SRQ) 11 ATN 23 Ground (ATN) 12 SHIELD Ground 24 Single GND Insert Ethernet Card

REMOTE CONTROL 139 Insert the Ethernet card Insert the Ethernet card into the slot. Close the cover by tightening the screws. Power On Connec

GDM-8261 User Manual 14 SHIFT → ACV (SCAN) / EXITSHIFTACVSCAN Starts the optional scan measurement (page 110). DCV DCV Measures DC Voltage (page

GDM-8261 User Manual 140 2. Press the Down key and the Left key repeatedly until LAN selection display appears. Note: The LAN menu will be selec

REMOTE CONTROL 141 Configure Ethernet Interface (RESET) Background The RESET command is used to reset the Ethernet card when new settings h

GDM-8261 User Manual 142 5. Press the Enter key followed by the Exit key. The Ethernet card will be reset after the exiting the menu system. AUT

REMOTE CONTROL 143 2. Press the Down key and the Right key. The DHCP selection display appears. TRIG 3. Press the Down key. The DHCP ON/

GDM-8261 User Manual 144 2. Press the Down key and the Right key twice. The IP selection display appears. Note: The IP address can only be edit

REMOTE CONTROL 145 8. Press the Exit key to exit from the configuration menu. / EXITSHIFT 2. Subnet Configuration 1. Press the Shift key, t

GDM-8261 User Manual 146 4. Use the Left/Right keys to move the cursor to the S1 value and select a digit. HOLD TRIG 5. Press the Up/Down

REMOTE CONTROL 147 2. Press the Down key and the Right key repeatedly until the GATEWAY selection display appears. Note: The gateway can on

GDM-8261 User Manual 148 8. Press the Exit key to exit from the configuration menu. / EXITSHIFT 4. DNS Configuration 1. Press the Shift key, th

REMOTE CONTROL 149 5. Press the Up/Down key to edit the selected digit. 6. Press the Enter key to confirm and automatically go onto

GETTING STARTED 15 SHIFT → / (dBm) / EXITSHIFT/dBm Measures dBm (page 58). Hz/P (Frequency/ Period) Hz/P Measures Frequency or Period (page 41

GDM-8261 User Manual 150 3. Press the Down key. The MAC address appears. 4. Press the Exit key to exit from the configuration menu. / EXI

REMOTE CONTROL 151 3. Press the Down key. The Telnet port appears. 4. Change the telnet port using the Left/Right and Up/Down keys. HOLD

GDM-8261 User Manual 152 Return to Initial Settings 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN c

REMOTE CONTROL 153 Note If the GDM-8261 is returned to the initial settings, a reset is performed automatically (page 141) after exiting th

GDM-8261 User Manual 154 3. Press the Down key. The WEB PW ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. When s

REMOTE CONTROL 155 3. Run this query via the terminal application: *idn? The command will return the instrument manufacturer, model number,

GDM-8261 User Manual 156 Web Control Interface The web control interface is accessible with the optional Ethernet card. The web control interface

REMOTE CONTROL 157 Note If the password dialog box or the Welcome Page fail to appear when WEB PW is set to ON, please ensure JavaScript an

GDM-8261 User Manual 158 3. View and Modify LAN Configuration The current Ethernet settings can be viewed and modified from the web control interf

REMOTE CONTROL 159 3. The View & Modify Configuration page allows you to:  View the instrument name, firmware revision of the Ethe

GDM-8261 User Manual 16 Measurement Keys (lower row) AUTO/ENTER AUTOENTER As the AUTO key, selects the measurement range automatically. As the En

GDM-8261 User Manual 160 Command Syntax The commands are partially compatible with IEEE488.2 (1992) and SCPI (1994) standard. Commands are NON-cas

REMOTE CONTROL 161 Message Separator EOL or , Command separator, user configurable (excluding GPIB), see page 132. Square Brackets [ ] Squ

GDM-8261 User Manual 162 CONFigure2:FUNCtion? ... 173 CONFigure2:RANGe? ...

REMOTE CONTROL 163 [SENSe:]TEMPerature:FRTD:TYPE? ... 179 [SENSe:]TEMPerature:FRTD:ALPHa

GDM-8261 User Manual 164 [SENSe:]FUNCtion[1/2]... 183 [SENSe:]VOLTage:DC:

REMOTE CONTROL 165 [SENSe:]CURRent:DC:RESolution? ... 187 [SENSe:]CURRent:AC:RESolution.

GDM-8261 User Manual 166 CALCulate:LIMit:UPPer? ... 192 CALCulate:DB:REFere

REMOTE CONTROL 167 SYSTem:BEEPer:STATe? ... 196 SYSTem:BEEPer:ERRor ..

GDM-8261 User Manual 168 *SRE? ... 200 *SRE..

REMOTE CONTROL 169 CONFigure Commands CONFigure:VOLTage:DC Sets measurement to DC Voltage on the first display and specifies range/resolution

GETTING STARTED 17 SHIFT → REL (RELative base) / EXITSHIFTRELREL# Manually sets the reference value for the Relative value measurement (page 6

GDM-8261 User Manual 170 CONFigure:FRESistance Sets measurement to 4W Resistance on the first display and specifies the range/resolution. Paramete

REMOTE CONTROL 171 CONFigure:TEMPerature:RTD Sets the measurement mode to 2W RTD measurement mode on the first display. Sets the sensor type.

GDM-8261 User Manual 172 CONFigure2:VOLTage:AC Sets measurement to AC Voltage on the second display and specifies range/resolution. Parameter: [No

REMOTE CONTROL 173 CONFigure2:FREQuency Sets measurement to Frequency on the second display and specifies range/resolution. Parameter: [None]

GDM-8261 User Manual 174 Measure Commands MEASure:VOLTage:DC? Returns the DC voltage measurement on the first display. Parameter: [None] | [Range

REMOTE CONTROL 175 MEASure:FRESistance? Returns the 4W resistance measurement on the first display. Parameter: [None] | [Range(<NRf> | M

GDM-8261 User Manual 176 MEASure:TEMPerature:FRTD? Returns the 4W RTD temperature for the selected sensor type on the first display. Parameter:[NO

REMOTE CONTROL 177 MEASure2:RESistance? Returns the 2W resistance measurement on the second display. Parameter: [None] | [Range(<NRf> |

GDM-8261 User Manual 178 [SENSe:]TEMPerature:RJUNction:SIMulated Set temperature simulation value. Parameter: <NRf>(0.00 ~ 50.00) Example: S

REMOTE CONTROL 179 [SENSe:]TEMPerature:FRTD:TYPE Sets the 4W RTD sensor type. Parameter: Type(PT100 | D100 | F100 | PT385 | PT3916 | USER) Exa

GDM-8261 User Manual 18 Rear Panel Overview RS232CAL KEYDIGITAL I / OSER.NO. LABEL50 , 60 , 400Hz25VA MAX.LINE RATINGFUSE LINE100VAC120VAC220V

GDM-8261 User Manual 180 [SENSe:]AVERage:TCONtrol Selects the digital filter. Parameter: MOV | REP Example: SENS:AVER:TCON MOV Sets the digital fi

REMOTE CONTROL 181 [SENSe:]PERiod:APERture? Returns the aperture time (gate time) for the period function. [SENSe:]FREQuency:INPutjack Assigns

GDM-8261 User Manual 182 [SENSe:]GAIN:AUTO? Returns the Auto gain mode. Return parameter: 0|1, 1=ON, 0=OFF [SENSe:]CONTinuity:THReshold Sets th

REMOTE CONTROL 183 [SENSe:]FUNCtion[1/2] Sets the function for the first or second display. Parameter: (display1):"VOLT[:DC]", "

GDM-8261 User Manual 184 [SENSe:]CURRent:AC:RANGe? Returns the AC Current measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]RESistance:RA

REMOTE CONTROL 185 [SENSe:]VOLTage:DC:RANGe:AUTO Sets the DC voltage Auto range on/off. Parameter: ON | OFF Example: SENS:VOLT:DC:RANG:AUTO ON

GDM-8261 User Manual 186 [SENSe:]RESistance:RANGe:AUTO? Returns the 2W resistance Auto-range setting. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]F

REMOTE CONTROL 187 [SENSe:]VOLTage:AC:RESolution Sets the AC Voltage measurement resolution. The resolution depends on the rate and range sett

GDM-8261 User Manual 188 [SENSe:]FRESistance:RESolution Sets the 4W Resistance measurement resolution. The resolution depends on the rate and rang

REMOTE CONTROL 189 [SENSe:]TEMPerature:FRTD:RESolution Sets the 4W RTD measurement resolution. The resolution depends on the rate and range se

GETTING STARTED 19 USB device port Accepts a USB device cable for remote control; Type A, female connector. For remote control details, see p

GDM-8261 User Manual 190 [SENSe:]CURRent:DC:NPLCycles? Returns the integration time for DC Current measurement in PLCs (power line cycles). Where

REMOTE CONTROL 191 CALCulate:STATe Turns the Advanced function on/off. Parameter: ON|OFF Example: CALC:STAT OFF Turns the Advanced function of

GDM-8261 User Manual 192 CALCulate:LIMit:UPPer? Returns the upper limit of the compare function. CALCulate:DB:REFerence Sets the reference value f

REMOTE CONTROL 193 CALCulate:AVERage:MINimum? Returns the minimum recorded value. Parameter: None | <NR1>(0~2) 0=Store, 1=Scan, 2=Stat

GDM-8261 User Manual 194 CALCulate:NULL:OFFSet Sets the reference value for the relative function. This command is analogous to the CALCulate:REL:

REMOTE CONTROL 195 TRIGger:DELay Sets the trigger delay in milliseconds Parameter: <NRf>(0 ~ 9999) | MIN | MAX Example: TRIG:DEL MAX Set

GDM-8261 User Manual 196 SYSTem Related Commands SYSTem:BEEPer:STATe Selects the beeper mode; no beep, beep on fail and beep on pass. Paramet

REMOTE CONTROL 197 SYSTem:OUTPut:FORMat? Returns the output format. Return parameter: (0|1|2|3) (0=V, 1=V+U, 2=V+C, 3=V+U+C) SYSTem:OUTPut:EOF

GDM-8261 User Manual 198 SYSTem:SCPi:MODE Sets the SCPI mode. The SCPI mode is used to determine whether the *IDN? query returns the “Normal” or “

REMOTE CONTROL 199 STATus Report Commands STATus:QUEStionable:ENABle Set bits in the Questionable Data Enable register. STATus:QUEStionable:E

This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied,

GDM-8261 User Manual 20 Set Up Tilt Stand Tilt stand steps Pull out the handle sideways and rotate it. Place the unit horizontally, Or in th

GDM-8261 User Manual 200 *ESR? Returns and clears SESR (Standard Event Status Register). Example: *ESR? >198 Returns 198. SESR=110001

REMOTE CONTROL 201 ROUTe Commands ROUTe:CLOSe Close a specified scanner channel. Parameter: <NR1>(101~118) Example: ROUT:CLOS 102 Clo

GDM-8261 User Manual 202 ROUTe:CHANnel Advanced configuration mode for the scanner channels. The channel function, voltage and Auto-range mode can

REMOTE CONTROL 203 ROUTe:ADVance Turns the scanner Advanced mode on/off. Parameter: ON|OFF Example: ROUT:ADV OFF Turns advanced scanner mode o

GDM-8261 User Manual 204 FETCh? Transfer the stored readings to the output buffer. DATA:POINts? Returns the number of readings. Parameter: None |

FAQ 205 FAQ ● What is the Output key used for? ● I pressed the EXIT key but cannot get out of Scanner mode. ● The GDM-8261 performance does n

GDM-8261 User Manual 206 APPENDIX System Info Firmware Version ... 207 Fuse Replacement Replace AC

APPENDIX 207 Firmware Version Background Firmware version is available from the system menu. Firmware version Shows the GDM-8261firmware ver

GDM-8261 User Manual 208 Fuse Replacement Replace AC Source Fuse Steps 1. Take off the power cord and remove the fuse socket using a minus driv

APPENDIX 209 Replace Input Current Fuse Step 1. Press the Fuse holder. 2. The fuse holder comes out. Replace the fuse inserted at the end

GETTING STARTED 21 Power Up Steps 1. Ensure the correct line voltage is lined up with the arrow on the fuse holder. If not, see page 208 to

GDM-8261 User Manual 210 Menu Tree Menu Tree Background The menu tree diagram shown on the next page represents the configuration menu that is ac

APPENDIX 211 Configuration Menu Tree 2NDMENUMEAS SET ADC HZ/P I/OCONT D-SHIFT INPUT R AC BW I-DETSPEED A-GAING-TIMERUSB GPIBVER LIGHT SAVE RE

GDM-8261 User Manual 212 Specifications General Note  All specifications are ensured only under a single display.  At least 1 hour of w

APPENDIX 213 DC Characteristics [1] DC Voltage Range[3] 24 Hour [2] 23˚C±1˚C 90 Day 23˚C±5˚C 1 Year 23˚C±5˚C Temperature Coefficient/˚C [6]

GDM-8261 User Manual 214 Measuring Characteristics DC Voltage Input Resistance Range 0.1V 10MΩ or >10GΩ Selectable 1V 10MΩ or >10GΩ Se

APPENDIX 215 will create some variation in the voltage drop across a diode junction. [ 6 ] 0˚C~18˚C, 28˚C~55˚C [ 7 ] When making 4W resistance

GDM-8261 User Manual 216 10.00000 mA 3Hz – 5Hz 1.1 + 0.06 1.1 + 0.06 1.1+0.06 0.2+0.006 5Hz – 10Hz 0.35 + 0.06 0.35 + 0.06 0.35+0.06 0.1+0.006 1

APPENDIX 217 Measuring Characteristics True RMS AC Voltage Measurement Method: AC-coupled True RMS – measures the ac component of input with

GDM-8261 User Manual 218 Frequency and Period Characteristics Frequency Period [3] Range [2] Frequency 24 Hour [1] 23˚C±1˚C 90 Day 23˚C±5˚C 1

APPENDIX 219 Temperature Characteristics (Display in °C, °F, Exclusive of probe errors.) RTD (Accuracy based on PT100): (100Ω platinum [PT

GDM-8261 User Manual 22 7. Then the default setting appears. Example: DCV, Auto, 100mV range VmSDCAUTO

GDM-8261 User Manual 220 Dimensions 22088220264.4350.310788309.18.416325.176.815.75710.7201.951019 7219 19All dimensions are shown in millimeters

APPENDIX 221 EC Declaration of Conformity We GOOD WILL INSTRUMENT CO., LTD. (1) No.7-1, Jhongsing Rd., Tucheng Dist., New Taipei City, Taiwan

GDM-8261 User Manual 222 INDEX A AC bandwidth setting ... 84 ADC speed setting ...

INDEX 223 IP 143 MAC address ... 149 Reset ... 14

GDM-8261 User Manual 224 command set ... 201 get out of scanner mode ... 205 install

BASIC MEASUREMENT 23 BASIC MEASUREMENT ACVDCVACIDCI2/4W/Hz/PTEMP Overview Basic Measurement Overview ... 25 Ref

GDM-8261 User Manual 24 Temperature Temperature Measurement ... 43 Select Thermocouple Type ...

BASIC MEASUREMENT 25 Basic Measurement Overview Background Basic measurement refers to the eight types of measurements assigned to the upper

GDM-8261 User Manual 26 Refresh Rate Function S M F (Readings/s) Continuity / Diode 100 200 300 DCV/DCI/100Ω~ 100MΩ (Accurate) 5 60 240 DCV/

BASIC MEASUREMENT 27 Manual/Automatic Triggering Automatic triggering (default) The GDM-8261 triggers according to the refresh rate. See the

GDM-8261 User Manual 28 Select Voltage Range Auto range To turn the automatic range selection On/Off, press the AUTO key. AUTO Manual range Press

BASIC MEASUREMENT 29 The DC voltage range should be manually selected when any of the following conditions are true: 1. When DCV measureme

Table of Contents 3 Table of Contents SAFETY INSTRUCTIONS ... 6 Safety Symbols ...

GDM-8261 User Manual 30 Voltage Conversion Table This table shows the relationship between AC and DC reading in various waveforms. Waveform Peak

BASIC MEASUREMENT 31 Crest Factor Table Background Crest factor is the ratio of the peak signal amplitude to the RMS value of the signal. It

GDM-8261 User Manual 32 AC/DC Current Measurement Background The GDM-8261 has two input ports for current measurement. A LO port for current less

BASIC MEASUREMENT 33 Select Current Range Auto range To turn the automatic range selection On/Off, press the AUTO key. AUTO Manual range Pres

GDM-8261 User Manual 34 The DC current range should be manually selected when the following conditions are true: 1. When DCI measurement is us

BASIC MEASUREMENT 35 2. 2W/4W resistance mode display appears WS2WkAUTO 2W or 4W + Ω Indicates 2W or 4W Resistance mode AUTO Indicates Autom

GDM-8261 User Manual 36 10MΩ 10Ω 11.99999MΩ 100MΩ 100Ω 119.9999MΩ Note For more detailed range, see the specifications at page 212.

BASIC MEASUREMENT 37 Diode Test Background Diode test checks the forward bias characteristics of a diode by running a constant forward bias c

GDM-8261 User Manual 38 Continuity Test Background Continuity test checks that the resistance in the DUT is low enough to be considered continuou

BASIC MEASUREMENT 39 Set Continuity Threshold Background Continuity threshold defines the maximum resistance allowed in the DUT when testing

GDM-8261 User Manual 4 View Serial Number ... 75 Trigger Setting ...

GDM-8261 User Manual 40 Select Beeper Setting Background Beeper setting defines how the GDM-8261 notifies the continuity test result to the user.

BASIC MEASUREMENT 41 Frequency/Period Measurement 1. Activate frequency/period measurement To measure Frequency, press the Hz/P key once. Hz/

GDM-8261 User Manual 42 Select Frequency/Period Voltage Range Frequency/Period mode To select between period/frequency voltage range, press the 2

BASIC MEASUREMENT 43 Temperature Measurement Background The GDM-8261 can measure temperature using either thermocouples or RTD sensors. For t

GDM-8261 User Manual 44 Range RTD: -200°C ~ +600°C (sensor dependent) Thermocouple: -210°C ~ +1820°C (sensor dependent) Select Thermocouple Type

BASIC MEASUREMENT 45 4. Select sensor type Press the Up/Down key. The thermocouple type switches to the next one.        5. Confirm

GDM-8261 User Manual 46 2. Edit reference temperature Use the Left/Right key to move the cursor, and use the Up/Down key to change the value. De

BASIC MEASUREMENT 47 3. Select sensor Press the Up and Down keys to highlight the RTD sensor type. RTD Type: PT 100, PT 3916, PT 385, F

GDM-8261 User Manual 48 Press the Down key twice. The RTD selection menu appears on the display. Use the Up/Down keys to select USER. 3. O

DUAL MEASUREMENT 49 DUAL MEASUREMENT Dual Measurement Background The dual measurement mode allows you to use the 2nd display to show anothe

Table of Contents 5 INDEX ... 222

GDM-8261 User Manual 50 Amplifier Output INPUTV WCOMVVoTAMPVoAC NoiseDC offset DC Power Supply Output DC outputDC Power SupplyINPUTV WCOMVAC rip

DUAL MEASUREMENT 51 ACV Hz  Measure the frequency response of devices such as amplifiers or buffers*. * The frequencies of the amplifier ou

GDM-8261 User Manual 52 2nd Measurement item setting Press the 2nd key, then the target item (example: ACV). The display updates the measurement r

DUAL MEASUREMENT 53 Connect the test leads and measure When using the dual measurement function, the connection method and number of test lea

GDM-8261 User Manual 54 Voltage/Frequency/Period and Current Measurement W4W INPUTSENSEHILOV WCOM0~1.2A0~10ALoad Note: DC Current measurements w

ADVANCED MEASUREMENT 55 ADVANCED MEASUREMENT /dBmHz/PdBMX/MNFILTERRELREL#HOLDCOMPTRIGINT/EXT2/4WMATH Overview Advanced Measurement Overview

GDM-8261 User Manual 56 Advanced Measurement Overview Background Advanced measurement mainly refers to the type of measurement which uses the res

ADVANCED MEASUREMENT 57 Refresh Rate Function S M F (Readings/s) Continuity / Diode 100 200 300 DCV/DCI/100Ω~ 100MΩ (Accurate) 5 60 240 DC

GDM-8261 User Manual 58 Manual triggering Press the Trig key to trigger the measurement manually. The trigger must be set to external (EXT) for ma

ADVANCED MEASUREMENT 59 Select reference resistance To change the reference resistance, press the Up/Down key. The new resistance appears in t

GDM-8261 User Manual 6 SAFETY INSTRUCTIONS This chapter contains important safety instructions that you must follow when operating the GDM-8261 an

GDM-8261 User Manual 60 dB result appears dBSDCVm dB Indicates dB measurement -00.617mV Indicates the present Voltage reading dBmref Press the 2

ADVANCED MEASUREMENT 61 Max/Min Measurement Applicable to ACVDCVACIDCI2/4WHz/PTEMP Background Maximum and Minimum measurement stores the high

GDM-8261 User Manual 62 Relative Value Measurement Applicable to ACVDCVACIDCI2/4WHz/PTEMP Background Relative measurement stores a value, typical

ADVANCED MEASUREMENT 63 V REL Indicates Relative measurement 1st display Shows the reference value (to full scale) 2nd display Indicate

GDM-8261 User Manual 64 Hold Measurement Applicable to ACVDCVACIDCI2/4WHz/PTEMP Background The Hold Measurement function retains the current meas

ADVANCED MEASUREMENT 65 Compare Measurement Applicable to ACVDCVACIDCI2/4WHz/PTEMP Background Compare measurement checks and updates if the

GDM-8261 User Manual 66 3. Low limit setting V 1st display Shows the low limit value 2nd display Indicates low limit setting 1. Use the Left/

ADVANCED MEASUREMENT 67 5. Result High If the 2nd display shows High, the result is above the High limit. Digital I/O: FAIL Out (Pin 6) a

GDM-8261 User Manual 68 Math Measurement Applicable to ACVDCVACIDCI2/4WHz/PTEMP Background Math measurement runs four types of mathematical oper

ADVANCED MEASUREMENT 69 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to offset setti

SAFETY INSTRUCTIONS 7 Safety Guidelines General Guideline CAUTION  Make sure that the voltage input level does not exceed DC1000V/AC750V.

GDM-8261 User Manual 70 Measure 1/X 1. Activate 1/X Press the Shift key, the 2/4W (Math) key, the Down key twice. The 1/X setting appears. / EXIT

ADVANCED MEASUREMENT 71 1. Use the Left/Right key to move the cursor (flashing point) between the digits and decimal point. HOLD TRIG 2.

GDM-8261 User Manual 72 2. Set Count Press the Enter key to set the number of measurements (counts) that will be used for the Stats function. The

ADVANCED MEASUREMENT 73 3. View Data SDC AUTOMATH 1st display Shows the current count number/measurement 2nd display Indicates the count mea

GDM-8261 User Manual 74 SYSTEM/DISPLAY CONFIGURATION ACVDCVACIDCIAUTORATEMX/MNFILTER2NDMENU Refresh Rate Refresh Rate Setting ...

SYSTEM/DISPLAY CONFIGURATION 75 Refresh Rate Setting Background Refresh rate defines how frequently the GDM-8261 captures and updates the mea

GDM-8261 User Manual 76 2. Press the Down key. The serial number is shown on the display. 1st display Shows 2 characters (AA~ZZ). 2nd d

SYSTEM/DISPLAY CONFIGURATION 77 DB-9, female Digital I/O pin assignment 6FAIL Out7 8 912 3 4 5High Limit FAIL OutVCC OutNCPASS OutExternal

GDM-8261 User Manual 78 Set Trigger Delay Background Trigger delay defines the time delay between triggering and measurement start. The default i

SYSTEM/DISPLAY CONFIGURATION 79 Digital Filter Setting Overview Filter basics The GDM-8261’s internal digital filter converts the analog inpu

GDM-8261 User Manual 8 Fuse WARNING  Fuse type: 0.315AT 100/120VAC 0.125AT 220/240 VAC  Make sure the correct type of fuse is install

GDM-8261 User Manual 80 Filter count Filter count defines the number of samples to be averaged per reading. More samples offer low noise but long

SYSTEM/DISPLAY CONFIGURATION 81 Turn off Filter Press the Shift key followed by the MX/MN (Filter) key. The Filter indicator will disappear fr

GDM-8261 User Manual 82 4. Select the level using the Up/Down key. 5. Press the Enter key to confirm your selection. Press the Exit key to go

SYSTEM/DISPLAY CONFIGURATION 83 2. Press the down key, followed by the right key twice to enter the D-SHIFT menu. TRIGTRIG 3. Press

GDM-8261 User Manual 84 2. Press the down key followed by the right key three times. The Input Resistance menu appears. TRIGTRIGTRIG 3.

SYSTEM/DISPLAY CONFIGURATION 85 Panel operation 1. Press the Shift key, the 2nd (Menu) key followed by the Right key. The MEAS menu appears.

GDM-8261 User Manual 86 Current Input Port Auto-Detect Setting Background The Current Input Port Auto-Detect setting will allow the DMM to detect

SYSTEM/DISPLAY CONFIGURATION 87 3. Press the Down key. The input current detect setting appears. 1st display Shows the current detect s

GDM-8261 User Manual 88 The diagram below shows how the total offset is obtained. BufferHiTotal offsetA/D DriverADCLoADC offsetA/D Driver offsetBu

SYSTEM/DISPLAY CONFIGURATION 89 Auto-Gain Background The Auto-Gain (A-GAIN) setting performs auto gain correction of the internal amplifiers

SAFETY INSTRUCTIONS 9 Power cord for the United Kingdom When using the GDM-8261 in the United Kingdom, make sure the power cord meets the foll

GDM-8261 User Manual 90 ADC Speed Setting Background The analog to digital converters have a Quick and Accurate Speed setting. The ADC Speed sett

SYSTEM/DISPLAY CONFIGURATION 91 3. Press the Down key, the right key and then the down key. The Speed settings menu appears. TRIG 1st di

GDM-8261 User Manual 92 2. Press the Down key twice. The INJACK setting appears. 1st display Indicates which input port is assigned as the

SYSTEM/DISPLAY CONFIGURATION 93 2. Press the Down key, the right key and then the down key. The gate time settings menu appears. TRIG 1s

GDM-8261 User Manual 94 Identification Settings Changing the Identification String Background The *IDN? query returns the manufacturer, model num

STORE/RECALL 95 STORE/RECALL The GDM-8261 can store and recall measurement history (for up to 9999 counts) as well as the instrument settings.

GDM-8261 User Manual 96 Store Measurement Record Background The GDM-8261 can log up to 9999 measurement results (counts) which can be stored and

STORE/RECALL 97 Recall Measurement Record Background The GDM-8261 can recall previously recorded measurement results for observation and anal

GDM-8261 User Manual 98 Save Instrument Settings Background The GDM-8261 can save up to 5 instrument settings. The settings can save the state,

STORE/RECALL 99 1st display Shows the memory number 4. Select the memory number using the Up/Down key or select Del-All to delete the save