GW Instek GDM-8261 User Manual
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GW Instek GDM-8261 User Manual

Dual measurement multimeter
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Dual Measurement Multimeter
GDM-8261
USER MANUAL
GW INSTEK PART NO. 82DM-82610EA1
ISO-9001 CERTIFIED MANUFACTURER
GlobalTestSupply
www.
.com
Find Quality Products Online at:
sales@GlobalTestSupply.com

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Summary of Contents for GW Instek GDM-8261

  • Page 1 Dual Measurement Multimeter GDM-8261 USER MANUAL GW INSTEK PART NO. 82DM-82610EA1 ISO-9001 CERTIFIED MANUFACTURER GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 2 This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the right to change specifications, equipment, and maintenance procedures at any time without notice.

  • Page 3: Table Of Contents

    Table of Contents SAFETY INSTRUCTIONS ............ 6 Safety Symbols ............ 6   Safety Guidelines ..........7   GETTING STARTED ............10 GDM-8261 Characteristics ........ 11   Front Panel Overview ........12   Rear Panel Overview ......... 17   Set Up ............... 19  ...
  • Page 4 GDM-8261 User Manual View Serial Number ........... 71   Trigger Setting ........... 72   Digital Filter Setting .......... 75   Display Setting ..........77   Measurement Configuration Settings ....78   ADC Setting ............83   Frequency / Period Settings ......87  ...
  • Page 5 Table of Contents INDEX ................193   GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 6: Safety Instructions

    GDM-8261 in the best possible condition. Safety Symbols These safety symbols may appear in this manual or on the GDM-8261. Warning: Identifies conditions or practices that could result in injury or loss of life.

  • Page 7: Safety Guidelines

     DC1000V/AC750V. Make sure the current input level does not exceed 10A.  CAUTION Do not place any heavy object on the GDM-8261.  Avoid severe impact or rough handling that can lead to  damaging the GDM-8261. Do not discharge static electricity to the GDM-8261.
  • Page 8 Humidity: Full accuracy to 80% RH at 40°C  (Note) EN 61010-1:2001 specifies the pollution degrees and their requirements as follows. The GDM-8261 falls under degree 2. Pollution refers to “addition of foreign matter, solid, liquid, or gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity”.
  • Page 9 SAFETY INSTRUCTIONS Power cord for the United Kingdom When using the GDM-8261 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...
  • Page 10 Please note the information in this manual was correct at the time of printing. However as GW Instek continues to improve its products, changes can occur at any time without notice. Please see the GW Instek website for the latest information and content. Characteristics GDM-8261 Characteristics ........

  • Page 11: Getting Started

    GETTING STARTED GDM-8261 Characteristics The GDM-8261 is a portable, dual-display digital multimeter suitable for a wide range of applications, such as production testing, research, and field verification. High DCV accuracy: 0.0035% Performance  High current range: 10A  High Voltage range: 1000V ...

  • Page 12: Front Panel Overview

    GDM-8261 User Manual Front Panel Overview Main Measurement Sense Hi Sense Lo, Display Keys DC/AC 1A Terminal Terminal Input Hi Terminal Input Lo Terminal DC/AC 10A Terminal AMPS Fuse Power Switch Main Display Holder Output On/Off Key POWER Turns On...

  • Page 13: Measurement Keys (Upper Row)

    GETTING STARTED Accepts HI sense line in 4W resistance Sense HI measurement. For details, see page 32. Terminal Accepts ground (COM) line in all Input Lo Terminal measurements except the sense line in 4W Resistance (page 32). Used as an input port for all Input Hi Terminal measurements except for DC/AC Current measurements.
  • Page 14 GDM-8261 User Manual Measures DC Voltage (page 26). Starts the step measurement (page STEP SHIFT → DCV 104) using the optional scanner. (STEP) Measures AC Current (page 30). Recalls a normal measurement RECALL SHIFT → ACI result, standard deviation (RECALL)

  • Page 15: Measurement Keys (Lower Row)

    GETTING STARTED Measurement Keys (lower row) As the AUTO key, selects the AUTO/ENTER measurement range automatically. As the Enter key, confirms the entered value. Selects the measurement update SHIFT → AUTO SHIFT / EXIT rate: Slow, Medium, or Fast (page (RATE) 24).
  • Page 16 GDM-8261 User Manual As the 2nd key, selects the 2nd (Display) / measurement item on the 2nd LOCAL display (page 46). Pressing and holding for more than 1 second turns off the 2nd display. As the Local key, releases the remote control and returns the instrument to local panel operation (page 122).

  • Page 17: Rear Panel Overview

    GETTING STARTED Rear Panel Overview Accepts the power cord. AC Power Cord 100/120/220/240V ±10%, Socket 45Hz~66Hz, 360Hz~440Hz. For power on sequence, see page 20. Holds the main fuse: Fuse Socket 100/120 VAC: 0.315AT 220/240 VAC: 0.125AT For fuse replacement details, see page 179.
  • Page 18 GDM-8261 User Manual Accepts a USB device cable for remote USB device port control; Type A, female connector. For remote control details, see page 122. Reserved for internal purposes such as CAL key port firmware updates and calibration. Accepts a digital I/O cable for the Digital I/O port Hi/Lo limit tests;...

  • Page 19: Set Up

    GETTING STARTED Set Up Tilt Stand Pull out the Tilt stand steps handle sideways and rotate it. Place the unit horizontally, Or in the tilt stand position. Place the handle vertically for hand carry. GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 20: Power Up

    GDM-8261 User Manual Power Up 1. Ensure the correct line voltage is Steps 2 4 0 lined up with the arrow on the fuse holder. If not, see page 179 to set the line voltage and fuse. 2. Connect the power cord to the AC Voltage input.
  • Page 21 GETTING STARTED 7. Then the default setting appears. Example: DCV, Auto, 100mV range GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 22: Basic Measurement

    GDM-8261 User Manual ASIC MEASUREMENT Overview Basic Measurement Overview ........ 24 Refresh Rate ............24 Reading Indicator ..........25 Manual/Automatic Triggering ........ 26 Voltage AC/DC Voltage Measurement ........ 26 Select Voltage Range ..........27 Voltage Conversion Table ........28 Crest Factor Table ..........29 Current AC/DC Current Measurement ........
  • Page 23 BASIC MEASUREMENT Temperature Temperature Measurement ........40 Select Thermocouple Type ........41 Set Reference Junction Temperature (T-CUP) ..42 Select Temperature Sensor Type ......43 Set User RTD ............44 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 24: Basic Measurement Overview

    Refresh Rate Refresh rate defines how frequently the GDM-8261 Background captures and updates measurement data. A faster refresh rate yields a lower accuracy and resolution. A slower refresh rate yields a higher accuracy and resolution.

  • Page 25: Reading Indicator

    BASIC MEASUREMENT Refresh Rate Function (Readings/s) Continuity / Diode DCV/DCI/100Ω~ 100MΩ (Accurate) 2400 DCV/DCI/100Ω~ 100MΩ (Quick) 3.38 ACV/ACI (sec/reading) Frequency / Period 1. Press the Shift key followed by Selection steps RATE the AUTO (RATE) key. The AUTO refresh rate switches to the next. 2.

  • Page 26: Ac/Dc Voltage Measurement

    GDM-8261 User Manual Manual/Automatic Triggering The GDM-8261 triggers according to the refresh rate. Automatic See the previous page for refresh rate setting details. triggering (default) Press the Trig key to trigger Manual measurement manually. The trigger triggering must be set to external (EXT) for manual triggering.

  • Page 27: Select Voltage Range

    BASIC MEASUREMENT Select Voltage Range To turn the automatic range selection Auto range On/Off, press the AUTO key. Press the Up or the Down key to select Manual range the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.

  • Page 28: Voltage Conversion Table

    GDM-8261 User Manual Voltage Conversion Table This table shows the relationship between AC and DC reading in various waveforms. Waveform Peak to Peak (True RMS) Sine 2.828 1.000 0.000 PK-PK Rectified Sine 1.414 0.435 0.900 (full wave) PK-PK Rectified Sine 2.000...

  • Page 29: Crest Factor Table

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

  • Page 30: Ac/Dc Current Measurement

    GDM-8261 User Manual AC/DC Current Measurement The GDM-8261 has two input ports for current Background measurement. A LO port for current less than 1.2A and a 10A port for measurements up to 10A. The GDM-8261 also features a “Current Input Port Auto-Detect”...

  • Page 31: Select Current Range

    BASIC MEASUREMENT Select Current Range To turn the automatic range Auto range selection On/Off, press the AUTO key. Press the Up or the Down key to Manual range select the range. AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.

  • Page 32: 2W/4W Resistance Measurement

    GDM-8261 User Manual 2W/4W Resistance Measurement Uses the standard V-COM ports. Measurement 2-wire Recommended for measuring resistances type larger than 1kΩ. Compensates the test lead effect using the 4-wire 4W compensation ports, in addition to the standard V-COM ports. Recommended for measuring sensitive resistances smaller than 1kΩ.

  • Page 33: Select Resistance Range

    BASIC MEASUREMENT Select Resistance Range To turn the automatic range Auto range selection On/Off, press the AUTO key. Press the Up or the Down key to Manual range select the range. AUTO indicator turns Off automatically. If the range is unknown, select the highest range. Selection list Range Resolution...

  • Page 34: Diode Test

    GDM-8261 User Manual Diode Test Diode test checks the forward bias characteristics of a Background diode by running a constant forward bias current, approx. 1mA, through the DUT. Press the key once. 1. Activate diode test 2. Diode mode display appears...

  • Page 35: Continuity Test

    BASIC MEASUREMENT Continuity Test Continuity test checks that the resistance in the DUT is Background low enough to be considered continuous (of conductive nature). Press the key twice. 1. Activate continuity test 2. Continuity mode display appears + Ω Indicates Continuity test CONT 2nd display shows the title INPUT...

  • Page 36: Set Continuity Threshold

    GDM-8261 User Manual Set Continuity Threshold Continuity threshold defines the maximum resistance Background allowed in the DUT when testing the continuity. 0 ~ 1000Ω, 1Ω resolution, 10Ω default Threshold Range 1. Press the Shift key, the 2nd key, 1. Activate the Right key.

  • Page 37: Select Beeper Setting

    BASIC MEASUREMENT Select Beeper Setting Beeper setting defines how the GDM-8261 notifies the Background continuity test result to the user. When the Beeper setting is off it will also turn the keypad sound off. Beeps when the test result is pass...

  • Page 38: Frequency/Period Measurement

    GDM-8261 User Manual Frequency/Period Measurement To measure Frequency, press the 1. Activate Hz/P key once. frequency/period measurement To measure the Period, press the Hz/P key twice. 2. Frequency (Period) mode display appears Hz (S) Indicates Frequency (period) measurement AUTO Indicates Automatic range selection...

  • Page 39: Select Frequency/Period Voltage Range

    BASIC MEASUREMENT Select Frequency/Period Voltage Range To select between period/frequency Frequency/Period voltage range, press the 2nd key mode twice. To turn the automatic range Auto range selection On/Off, press the AUTO key. Press the Up or the Down key to Manual range select the range.

  • Page 40: Temperature Measurement

    GDM-8261 User Manual Temperature Measurement The GDM-8261 can measure temperature using either Background thermocouples or RTD sensors. For thermocouples, the GDM-8261 accepts a thermocouple input and calculates the temperature from the voltage fluctuation. The thermocouple type and reference junction temperature are also considered.

  • Page 41: Select Thermocouple Type

    BASIC MEASUREMENT RTD: -200°C ~ +600°C (sensor dependent) Range Thermocouple: -210°C ~ +1820°C (sensor dependent) Select Thermocouple Type The GDM-8261accepts thermocouple inputs and Background calculates the temperature from the voltage difference of two dissimilar metals. Thermocouple type and reference junction temperature are also considered. Parameter Thermocouple Range...

  • Page 42: Set Reference Junction Temperature (T-Cup)

    Set Reference Junction Temperature (T-CUP) When a thermocouple is connected to the GDM-8261, Background the temperature difference between the thermocouple lead and the GDM-8261 input terminal should be taken into account and be cancelled; otherwise an erroneous temperature might be added. Type...

  • Page 43: Select Temperature Sensor Type

    (cancel) Select Temperature Sensor Type The GDM-8261 supports a number of thermocouple Background types as well as 2 or 4 wire RTD. It is important to specify the type of temperature sensor used.

  • Page 44: Set User Rtd

    GDM-8261 User Manual Press the Up and Down keys to 3. Select sensor highlight the RTD sensor type. PT 100, PT 3916, PT 385, F 100, D 100, RTD Type: USER Press the Enter key to confirm. 4. Confirm and...
  • Page 45 BASIC MEASUREMENT Use the Up/Down keys to select USER. Press Enter. The alpha coefficient 3. Open USER menu appears on the display. type menu Use the Left/Right key to move the 4. Edit coefficient cursor, and use the Up/Down key to values change the coefficient value.

  • Page 46: Dual Measurement

    GDM-8261 User Manual UAL MEASUREMENT Dual Measurement The dual measurement mode allows you to use the 2nd Background display to show another item, thus viewing two different measurement results at once. When the multimeter is used in dual measurement mode, both displays are updated from either a single measurement or from two separate measurements.
  • Page 47 DUAL MEASUREMENT Amplifier Output INPUT AC Noise DC offset DC Power Supply Output INPUT AC ripple Power DC output Supply Monitor the voltage and current  present on a component in a circuit or the output voltage and current of a DC power supply.
  • Page 48 GDM-8261 User Manual Measure the frequency response of  devices such as amplifiers or buffers*. * The frequencies of the amplifier output must be within the DMM’s measurable AC bandwidth for the amplitude at a spot frequency to be measured accurately.
  • Page 49 DUAL MEASUREMENT Press the 2nd key, then the target item (example: ACV). The display Measurement updates the measurement result. item setting (example: ACI + ACV) AUTO AUTO Shows the primary measurement result 1st Display Shows the secondary measurement 2nd Display result Indicates that dual measurement is active...
  • Page 50 GDM-8261 User Manual When using the dual measurement function, the Connect the test connection method and number of test leads required leads and depends on the measurement combination. Use the measure connect diagrams below as guide when taking dual measurements.
  • Page 51 DUAL MEASUREMENT Voltage/Frequency/Period/Resistance and Current Measurement Note: 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.

  • Page 52: Advanced Measurement

    GDM-8261 User Manual DVANCED MEASUREMENT REL# MATH Hz/P 2/4W Overview Advanced Measurement Overview ......53 Refresh Rate ............53 Reading Indicator ..........54 Common Attribute: Manual/Automatic Triggering . 54 dBm/dB dBm/dB Measurement ........... 55 Measure dBm ............55 Measure dB ............56 Max/Min Max/Min Measurement .........

  • Page 53: Advanced Measurement Overview

    ● ● — Math Refresh Rate Refresh rate defines how frequently the GDM-8261 Background captures and updates measurement data. A faster refresh rate yields a lower accuracy and resolution. A slower refresh rate yields a higher accuracy and resolution. Consider these tradeoffs when selecting the refresh rate.

  • Page 54: Reading Indicator

    GDM-8261 User Manual Refresh Rate Function (Readings/s) Continuity / Diode DCV/DCI/100Ω~ 100MΩ (Accurate) 2400 DCV/DCI/100Ω~ 100MΩ (Quick) 3.38 ACV/ACI (sec/reading) Frequency/Period 1. Press the Shift key followed by RATE Selection steps the AUTO (RATE) key. The AUTO refresh rate switches to the next.

  • Page 55: Dbm/Db Measurement

    See page 72. dBm/dB Measurement Applicable to Using the ACV or DCV measurement result, the Background GDM-8261 calculates the dB or dBm value based on a reference resistance value in the following way. 10 x log (1000 x Vreading / Rref) dBm –...

  • Page 56: Measure Db

    Measure dB dB is defined as [dBm−dBmref]. When the dB Background measurement is activated, the GDM-8261 calculates the dBm using the reading at the first moment and stores it as dBmref. Press the Shift key followed by the Activate dB Hz/P key.

  • Page 57: Max/Min Measurement

    ADVANCED MEASUREMENT Max/Min Measurement Applicable to Maximum and Minimum measurement stores the highest Background (maximum) or lowest (minimum) reading and shows it on the 1 display when the 2nd key is pressed. For Max measurement, press the 1. Activate MX/MN key once. Max/Min For Min measurement, press the MX/MN key twice.

  • Page 58: Relative Value Measurement

    GDM-8261 User Manual Relative Value Measurement Applicable to Relative measurement stores a value, typically the data at Background the moment, as the reference. The following measurement is shown as the delta between the reference. The reference value will be cleared upon exit.
  • Page 59 ADVANCED MEASUREMENT Indicates Relative measurement Shows the reference value (to full scale) 1st display Indicates Relative value modification 2nd display 2. Use the Left/Right key to move the flashing point (cursor), and use the Up/Down key to change the value. 3.

  • Page 60: Hold Measurement

    GDM-8261 User Manual Hold Measurement Applicable to The Hold Measurement function retains the current Background measurement data and updates it only when it exceeds the set threshold (as a percentage of the retained value). Press the Hold key. 1. Activate Hold measurement 2.

  • Page 61: Compare Measurement

    ADVANCED MEASUREMENT Compare Measurement Applicable to Compare measurement checks and updates if the Background measurement data stays between the upper (high) and lower (low) limit specified. Press the Shift key, then the Hold 1. Activate COMP (Comp) key. Compare HOLD measurement 2.
  • Page 62 GDM-8261 User Manual 3. Low limit setting Shows the low limit value 1st display Indicates low limit setting 2nd display 1. Use the Left/Right key to move the cursor (flashing point) between high/low setting, digits, and decimal point. 2. Change the parameter using the Up/Down key.
  • Page 63 ADVANCED MEASUREMENT If the 2nd display shows 5. Result High High, the result is above the High limit. Digital I/O: FAIL Out (Pin 6) and HIGH Limit FAIL Out (Pin 7) are activated. If the 2nd display shows Low, the result is below the Low limit.

  • Page 64: Math Measurement

    GDM-8261 User Manual Math Measurement Applicable to Math measurement runs four types of mathematical Background operations, MX+B, 1/X, Percentage and Stats, based on the other measurement results. Multiplies the reading (X) by the factor (M) Math type MX+B and adds/subtracts offset (B).
  • Page 65 ADVANCED MEASUREMENT 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to offset setting. 3. Set the offset Shows the offset (B) 1st display Indicates MX+B (The letter B flashes) 2nd display 1.

  • Page 66: Measure 1/X

    GDM-8261 User Manual Measure 1/X Press the Shift key, the 2/4W (Math) MATH 1. Activate 1/X key, the Down key twice. The 1/X 2/4W setting appears. Press the Enter key to view the 1/X 2. View 1/X measurement result. Shows the 1/X value...

  • Page 67: Statistics Calculations

    ADVANCED MEASUREMENT 1. Use the Left/Right key to move the cursor (flashing point) between the digits and decimal point. 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing. 3. View Percentage Shows the calculated result 1st display Indicates the Percentage measurement 2nd display...
  • Page 68 GDM-8261 User Manual Press the Enter key to set the 2. Set Count number of measurements (counts) that will be used for the Stats function. The Count menu appears. Shows the count number as continuous 1st display Indicates the count setting 2nd display 1.
  • Page 69 ADVANCED MEASUREMENT 3. View Data Shows the current count 1st display number/measurement Indicates the count measurement mode. 2nd display Indicates Math operation MATH Press the 2nd key to cycle through the different statistical data measurements.     Indicates the current measurement COUNT count Indicates the minimum data value...

  • Page 70: System/Display Configuration

    GDM-8261 User Manual YSTEM/ ISPLAY CONFIGURATION RATE MENU AUTO Refresh Rate Refresh Rate Setting ..........71 View Serial Number ..........71 Trigger Manual/Automatic Triggering ........ 72 Use External Trigger ..........72 Set Trigger Delay ............ 74 Digital Filter Overview ..............75 Filter Setting ............

  • Page 71: Refresh Rate Setting

    SYSTEM/DISPLAY CONFIGURATION Refresh Rate Setting Refresh rate defines how frequently the GDM-8261 Background captures and updates the measurement data. A faster refresh rate yields a lower accuracy and resolution. Slower refresh rates yield a higher accuracy and resolution. Consider this trade-off when selecting the refresh rate.

  • Page 72: Trigger Setting

    See below triggering for details. Use External Trigger The GDM-8261 uses the internal trigger by default, for Background example to count the frequency and the period. Using an external trigger allows customized triggering conditions. Connect the external trigger signal to the Digital I/O Signal port located on the rear panel.
  • Page 73 SYSTEM/DISPLAY CONFIGURATION DB-9, female Digital I/O pin assignment Press the Shift key followed by the 1. Activate INT/EXT Trig (Int/Ext) key. The EXT external trigger TRIG indicator appears on the display. Press the Trig key to start triggering 2. Start trigger manually.

  • Page 74: Set Trigger Delay

    GDM-8261 User Manual Set Trigger Delay Trigger delay defines the time delay between triggering Background and measurement start. The default is set at 10ms. The delay settings are not supported when the optional scanner is installed. 1. Press the Shift key, the 2nd...

  • Page 75: Digital Filter Setting

    SYSTEM/DISPLAY CONFIGURATION Digital Filter Setting Overview The GDM-8261’s internal digital filter converts the Filter basics analog input signal into digital format before passing it to internal circuits for processing. The filter affects the amount of noise included in the measurement result.

  • Page 76: Filter Setting

    GDM-8261 User Manual Filter count defines the number of samples to be Filter count averaged per reading. More samples offer low noise but long delay. Less samples offer high noise but short delay. 2 ~ 100 Range Filter Setting 1. Press the Shift key followed by...

  • Page 77: Display Setting

    SYSTEM/DISPLAY CONFIGURATION Press the Shift key followed by the FILTER Turn off Filter MX/MN (Filter) key. The Filter MX/MN indicator will disappear from the display. Display Setting Display Light Setting The display light setting adjusts the brightness of the Background display reading.

  • Page 78: Measurement Configuration Settings

    GDM-8261 User Manual 4. Select the level using the Up/Down key. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. Display On/Off Setting (+ key lock) The display can be turned off when not used for a long Background time.

  • Page 79: Input Resistance Setting

    SYSTEM/DISPLAY CONFIGURATION 2. Press the down key, followed by the right key twice to enter the D-SHIFT menu. 3. Press the Down key. The D-Shift setting appears. Shows the D-Shift setting 1st display 4. Select the setting using the Up/Down keys. 5.

  • Page 80: Ac Bandwidth Setting

    GDM-8261 User Manual 2. Press the down key followed by the right key three times. The Input Resistance menu appears. 3. Press the Down key. The input resistance setting appears. Shows the input resistance setting 1st display 4. Select the setting using the Up/Down keys.
  • Page 81 SYSTEM/DISPLAY CONFIGURATION 1. Press the Shift key, the 2nd MENU Panel operation (Menu) key followed by the Right key. The MEAS menu appears. 2. Press the down key followed by the left key twice. The AC Bandwidth menu appears. 3. Press the Down key. The input bandwidth setting appears.

  • Page 82: Current Input Port Auto-Detect Setting

    GDM-8261 User Manual Current Input Port Auto-Detect Setting The Current Input Port Auto-Detect setting will allow Background the DMM to detect whether current is applied to the 1A or 10A input ports and enables it to set the correct range when Auto range is on.

  • Page 83: Adc Setting

    The combined offset from the input buffer, A/D driver Theory and ADC is called the total offset. Due to temperature variations inside the GDM-8261, the offsets for the Buffer, A/D driver and ADC vary over time, and thus the total offset will also vary over time.
  • Page 84 GDM-8261 User Manual The diagram below shows how the total offset is obtained. Quick Speed Applicable Mode Rate Accuracy Speed Measurement   DCV, Mode, Rate and DCI,  Speed settings 4W/2W  TC, RTD  (No Speed setting) MENU 1.

  • Page 85: Auto-Gain

    SYSTEM/DISPLAY CONFIGURATION Auto-Gain The Auto-Gain (A-GAIN) setting performs auto gain Background correction of the internal amplifiers. Off, On (default=On) Setting Quick Speed Applicable Mode Rate Accuracy Speed Measurement   DCV, Mode, Rate and  Speed settings   (No Speed setting) MENU 1.

  • Page 86: Adc Speed Setting

    GDM-8261 User Manual ADC Speed Setting The analog to digital converters have a Quick and Background Accurate Speed setting. The ADC Speed settings only apply to DCV, DCI or 2/4W resistance measurements. The ADC Speed settings can only be set if DCV, DCI or 2/4W mode is active.

  • Page 87: Frequency / Period Settings

    SYSTEM/DISPLAY CONFIGURATION 4. Use the Up/Down keys to select either ACCUR or QUICK. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. Frequency / Period Settings Input Port Selection The INJACK settings set which input port is used for Background frequency or period measurements.

  • Page 88: Gate Time Setting

    GDM-8261 User Manual 4. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. Gate Time Setting The gate time settings determine the accuracy of the Background frequency and period measurements. The gate time settings are the equivalent to the Fast, Medium and Slow rate settings.
  • Page 89 SYSTEM/DISPLAY CONFIGURATION 4. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 90: Store/Recall

    GDM-8261 User Manual TORE/ ECALL The GDM-8261 can store and recall measurement history (for up to 10000 counts) as well as the instrument settings. For storing and recalling measurement results using the Scanner, see page 96. STORE RECALL Store Measurement Record ........91 Recall Measurement Record ........

  • Page 91: Store Measurement Record

    STORE/RECALL Store Measurement Record The GDM-8261 can log up to 9999 measurement results Background (counts) which can be stored and recalled later for analysis. Basic measurement statistics such as Maximum, Minimum, Average value as well as Standard Deviation are also recorded with the data.

  • Page 92: Recall Measurement Record

    GDM-8261 User Manual Recall Measurement Record The GDM-8261 can recall previously recorded Background measurement results for observation and analysis. The Standard Deviation, Maximum Value, Minimum Value and Average Value can also be viewed. Store/recall measurement history is not applicable to the...

  • Page 93: Save Instrument Settings

    STORE/RECALL Save Instrument Settings The GDM-8261 can save up to 5 instrument settings. Background The settings can save the state, function, I/O and range. Upon powering up, the current instrument setting is displayed. Save (1-5), Del-All Parameter Main display parameters...

  • Page 94: Recall Instrument Settings

    GDM-8261 User Manual Shows the memory number 1st display 4. Select the memory number using the Up/Down key or select Del-All to delete the save settings in memory. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display.
  • Page 95 STORE/RECALL Shows the memory number 1st display 4. Select the memory number using the Up/Down key. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. When the instrument is reset or upon the next power up, the recalled settings will be enabled.

  • Page 96: Scanner (Optional)

    GDM-8261 User Manual CANNER (OPTIONAL) The optional scanner GDM-SC1 lets you effectively measure multiple channels connected to a single GDM-8261 DMM. SCAN STEP Installation GDM-SC1 Scanner Specifications ......97 Configure Scanner ..........97 Select Channel Group and Enable Scanner .... 99 Connect Wires ............

  • Page 97: Gdm-Sc1 Scanner Specifications

    SCANNER (OPTIONAL) GDM-SC1 Scanner Specifications 16 pairs 2A (ch17, ch18) 2-wire channel Maximum current 8 pairs 2/4 wire 4-wire channel Resistance N/A (internal) Single wire channel Cold junction 250V Screw terminal Maximum voltage Connection Scanner Installation Configure Scanner 1. Take off four screws from the bottom panel of the Open Scanner scanner.
  • Page 98 GDM-8261 User Manual 3. The connection terminals are revealed. CARD INPUT LO CARD INPUT HI CARD SENSE LO CARD SENSE HI 10 11 AMPS LO CH17 18 AMPS HI 16 general purpose channels are available, 8 on the left Overview row, 8 on the right row.

  • Page 99: Select Channel Group And Enable Scanner

    Set the jumper J8 in the center of the board to the Select group MASTER configuration. Move the jumper to the right (Jumper J8) (pins 2-3) to select CH1xx (101 ~ 118). The GDM-8261 does not support the SLAVE operation mode with the optional scanner. CH201-218...

  • Page 100: Connect Wires

    GDM-8261 User Manual Connect Wires Make sure the wires have at least the same voltage and Wire selection current capacity as the maximum ratings of the measurement. 1. Turn the screw left (loose) using a screw driver and Connection insert the wire. Turn the screw right (tighten) and secure the connection.

  • Page 101: Insert Scanner

    4. Close the top cover and tighten the screw from the bottom. Print out the configuration record list on page 103, fill in Configuration the details, and keep it with the GDM-8261. Record Insert Scanner Turn the Power Off and take out the power cord.
  • Page 102 GDM-8261 User Manual Take off the two screws on the slot corners to remove Open the the optional slot cover. Keep the screws for later reuse. GDM-8261 rear panel slot Insert the scanner bottom-side-up (already configured Insert the according to the procedures on page 97) into the slot.

  • Page 103: Scanner Configuration Record

    SCANNER (OPTIONAL) Scanner Configuration Record Measurement Channel Wire color Note type CH10 CH11 CH12 CH13 CH14 CH15 CH16 CH17 CH18 CARD INPUT H CARD SENSE H AMPS GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 104: Setup Scan

    (Continuous) end of the loop count. Then it goes into the idle mode. The GDM-8261 stays in the idle mode by External default. The trigger timing is manually (Manual) controlled by the user from the front panel using the Trig key.

  • Page 105: Setup Simple Scan

    SCANNER (OPTIONAL) Measures a single channel in the specified Step range (Channel MIN~MAX)at each trigger event. Timer settings (page 106) apply for each channel. Example: Step through channel 1~4 with a count of 12. Selects just one channel and continuously Monitor measures it.
  • Page 106 GDM-8261 User Manual 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. 101 ~ 118 Range 5. When finished, press the Enter key. The End (Maximum) channel setting appears. 6. Move the cursor to the channel...

  • Page 107: Setup Advanced Scan

    SCANNER (OPTIONAL) 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. 1 ~ 999 Range 11. Press the Enter key followed by the Exit key. The setting is stored and the display goes back to the normal mode.
  • Page 108 GDM-8261 User Manual 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. 101 ~ 118 Range 5. When finished, press the Enter key. The End (Maximum) channel setting appears. 6. Move the cursor to the channel...
  • Page 109 SCANNER (OPTIONAL) 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. 11. When finished, press the Enter key. The channel setting appears. 12. The Minimum (first) scanned channel, as set in the Simple Scan setting, appears.

  • Page 110: Use External Trigger

    GDM-8261 User Manual Use External Trigger The GDM-8261 uses the internal trigger by default. Background Using an external trigger allows customized triggering. Connect the external trigger signal to the Digital I/O Signal port located on the rear panel. connection DB-9, female...

  • Page 111: Run Scan

    SCANNER (OPTIONAL) Run Scan Overview Measures all the specified channel ranges Scan operation Scan at each trigger event. The timer settings type (page 106) apply to each scan. Measures a single channel in the specified Step range at each trigger event. The timer settings (page 106) apply to each channel.

  • Page 112: Recall Scan/Step Result

    GDM-8261 User Manual Recall Scan/Step Result 1. After the Scan/Step is Panel operation RECALL completed, the data is stored internally. Press the Shift key followed by the ACI (Recall) key. 2. The first channel appears. (example: channel 101) 3. To view the Standard...
  • Page 113 SCANNER (OPTIONAL) 3. Press the Down key. The channel selection appears. 4. Move the cursor to the channel using the Left/Right key, and change the channel number using the Up/Down keys. 5. When finished, press the Enter key. The Monitoring starts. GlobalTestSupply www.

  • Page 114: Digital I/O

    GDM-8261 User Manual IGITAL I/O The rear panel Digital I/O terminal outputs the result of Compare measurements to external devices. COMP HOLD Terminal Digital I/O Terminal Configuration ...... 115 configuration Application Application: Compare measurement ....116 Application: External trigger ........ 119 GlobalTestSupply www.

  • Page 115: Digital I/O Terminal Configuration

    DIGITAL I/O Digital I/O Terminal Configuration The digital I/O terminal outputs the result of Compare Background measurements to control external devices. By providing separate VCC power for the terminal, the outputs can also be used as a power source for TTL and CMOS circuits. Connector type: DB-9 female assignment...
  • Page 116 GDM-8261 User Manual FAIL signal Output. Activates when the Pin6 compare result is FAIL. HIGH Limit FAIL signal Output. Activates Pin7 when the compare result is FAIL due to violating the HIGH Limit. LOW Limit FAIL signal Output. Activates Pin8 when the compare result is FAIL due to violating the LOW Limit.
  • Page 117 DIGITAL I/O 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to the low limit setting. 3. Low limit setting Shows the low limit value 1st display Indicates low limit setting 2nd display Set the low limit in the same way as in the high limit.
  • Page 118 GDM-8261 User Manual Digital I/O: FAIL Out (Pin 6) and LOW Limit FAIL Out (Pin 8) are activated. If the 2nd display shows Pass Pass, the result is staying between the High and the Low limit. Digital I/O: PASS Out (Pin 5) is activated.
  • Page 119 DIGITAL I/O Application: External trigger The GDM-8261 uses the internal trigger by default, for Background example to count the frequency and the period. Using an external trigger allows for customized triggering conditions. Connect the external trigger signal to the Digital I/O Signal port located on the rear panel.
  • Page 120 GDM-8261 User Manual Press the Trig key to start triggering 2. Start trigger manually. The indicator turns The reading indicator stays On before triggering. Reading indicator After triggering, the indicator flashes according to the external signal trigger timing. Press the Shift key followed by the...

  • Page 121: Remote Control

    REMOTE CONTROL EMOTE CONTROL Interface Overview .............. 122 Configure USB Interface ........122 Insert GPIB Card ..........123 Configure GPIB Interface ........124 Configure RS-232C Interface ........ 127 Set the EOL Character .......... 128 Set the Separation Character ........ 129 Set the Return Format ..........

  • Page 122: Configure Interface

    GDM-8261 User Manual Configure Interface Overview USB 1.1 or 2.0, TypeA, female Interface type USB Device connector. D-sub 9 pin, male connector. Baud rate: RS-232C 230400/115200/57600/38400/19200/ 9600. 24 Pin female GPIB port GPIB (optional) In order to switch back to the Local...

  • Page 123: Insert Gpib Card

    Turn the Power Off and take out the power cord. Power Off Take off the two screws on the slot corners to remove Open the the optional communication port cover. Keep the screws GDM-8261 for later reuse. optional communication port GlobalTestSupply www.

  • Page 124: Configure Gpib Interface

    GDM-8261 User Manual Insert the GPIB card into the slot. Close the cover by Insert the GPIB tightening the screws. card Connect the power cord and turn On the power. Power On Configure GPIB Interface 1. Press the Shift key, the 2nd...
  • Page 125 REMOTE CONTROL 2. Press the Down key and the Left key. The GPIB selection display appears. Note: The GPIB menu will be selectable only when the GPIB card is installed. 3. Press the Down key. The GPIB ON/OFF selection appears. 4.
  • Page 126 GDM-8261 User Manual 8. Connect the GPIB cable to the rear panel optional communication port after the GPIB card has been installed (page 123). Pin Signal Pin Signal GPIB pin assignment Data I/O 1 13 Data I/O 5 Data I/O 2 14 Data I/O 6...

  • Page 127: Configure Rs-232C Interface

    REMOTE CONTROL Configure RS-232C Interface 1. Press the Shift key, the 2nd MENU Configuration (Menu) key, the left key step repeatedly until the I/O configuration menu appears. 2. Press the Down key. The RS-232C selection display appears. 3. Press Enter or Down to confirm RS232 selection.

  • Page 128: Set The Eol Character

    GDM-8261 User Manual Set the EOL Character The TX TERM configuration menu can set the Description end-of-line (EOL) character for remote commands when used with USB and RS232. The GPIB EOL character is fixed as CR+LF. CR, LF, CR+LF (default = CR+LF) 1.

  • Page 129: Set The Separation Character

    REMOTE CONTROL 5. Press the Enter key followed by the Exit key. The EOL setting is stored and the display goes back to the default display. Set the Separation Character The TX TERM configuration menu can set the Description separation character for remote commands. 1.

  • Page 130: Set The Return Format

    GDM-8261 User Manual Set the Return Format When the VAL1?, VAL2?, TRACe:DATA? and FETCh? Description queries are used, the return measurement format can be configured in one of four ways: V (value), V+U (value, unit), V+C (value, count#), V+U+C (value, unit, count#).
  • Page 131 REMOTE CONTROL 4. Press the Up/Down key to select the Return format.    5. Press the Enter key followed by the Exit key. The return format setting is saved and the display goes back to the default display. GlobalTestSupply www.

  • Page 132: Command Syntax

    Any NR1,NR2 or NR3 value. The GDM-8261 automatically translates to MIN, MAX the Minimum (min) or Maximum (max) value available. Default setting value. The GDM-8261 automatically translates the command Automatic parameter into the closest available value. parameter range CONF:VOLT:DC 1 (Sets the selection...

  • Page 133: Command Set

    REMOTE CONTROL Square brackets denote function Square Brackets commands or parameters that can be omitted from the command or query. For example the query, [SENSe:]UNIT? can be expressed in 2 valid forms: [SENSe:]UNIT? or UNIT? Command Set CONFigure:VOLTage:DC ................. 141 CONFigure:VOLTage:AC ................
  • Page 134 GDM-8261 User Manual CONFigure2:AUTO .................. 145   CONFigure2:AUTO? ................145   MEASure:VOLTage:DC? ................146   MEASure:VOLTage:AC? ................146   MEASure:CURRent:DC? ................146   MEASure:CURRent:AC? ................146   MEASure:RESistance? ................146   MEASure:FRESistance? ................147   MEASure:FREQuency? ................147   MEASure:PERiod? ..................147  ...
  • Page 135 REMOTE CONTROL [SENSe:]TEMPerature:FRTD:ALPHa? ............. 151 [SENSe:]TEMPerature:FRTD:BETA ............151 [SENSe:]TEMPerature:FRTD:BETA? ............151 [SENSe:]TEMPerature:FRTD:DELTa ............151 [SENSe:]TEMPerature:FRTD:DELTa? ............151 [SENSe:]DETector:RATE ................151 [SENSe:]DETector:RATE? ................. 151 [SENSe:]AVERage:TCONtrol ..............152 [SENSe:]AVERage:TCONtrol? ..............152 [SENSe:]AVERage:COUNt ............... 152 [SENSe:]AVERage:COUNt? ..............152 [SENSe:]AVERage:STATe ................152 [SENSe:]AVERage:STATe? ................. 152 [SENSe:]FREQuency:APERture ..............
  • Page 136 GDM-8261 User Manual [SENSe:]VOLTage:DC:RANGe? ..............155   [SENSe:]VOLTage:AC:RANGe ..............155   [SENSe:]VOLTage:AC:RANGe? ..............155   [SENSe:]CURRent:DC:RANGe ..............155   [SENSe:]CURRent:DC:RANGe? ..............155   [SENSe:]CURRent:AC:RANGe ..............155   [SENSe:]CURRent:AC:RANGe? ..............155   [SENSe:]RESistance:RANGe ..............156   [SENSe:]RESistance:RANGe? ..............156   [SENSe:]FRESistance:RANGe ..............156  ...
  • Page 137 REMOTE CONTROL [SENSe:]CURRent:AC:RESolution? ............159 [SENSe:]RESistance:RESolution .............. 159 [SENSe:]RESistance:RESolution? ............159 [SENSe:]FRESistance:RESolution ............159 [SENSe:]FRESistance:RESolution? ............159 [SENSe:]CONTinuity:RESolution ............. 160 [SENSe:]CONTinuity:RESolution? ............160 [SENSe:]DIODe:RESolution ..............160 [SENSe:]DIODe:RESolution? ..............160 [SENSe:]TEMPerature:TCOuple:RESolution ........... 160 [SENSe:]TEMPerature:TCOuple:RESolution? ......... 160 [SENSe:]TEMPerature:FRTD:RESolution ..........160 [SENSe:]TEMPerature:FRTD:RESolution? ..........160 [SENSe:]TEMPerature:RTD:RESolution ..........
  • Page 138 GDM-8261 User Manual CALCulate:DB:REFerence? ............... 163   CALCulate:DBM:REFerence ..............164   CALCulate:DBM:REFerence? ..............164   CALCulate:STORe:COUNt ............... 164   CALCulate:STORe:COUNt? ..............164   CALCulate:AVERage:COUNt? ..............164   CALCulate:AVERage:MINimum? ............. 164   CALCulate:AVERage:MAXimum? ............. 164   CALCulate:AVERage:AVERage? ..............164   CALCulate:AVERage:PTPeak? ..............164  ...
  • Page 139 REMOTE CONTROL SYSTem:DISPlay ..................168 SYSTem:DISPlay? ..................168 SYSTem:OUTPut:FORMat ............... 168 SYSTem:OUTPut:FORMat? ..............169 SYSTem:OUTPut:EOF ................169 SYSTem:OUTPut:EOF? ................169 SYSTem:OUTPut:SEParate ..............169 SYSTem:OUTPut:SEParate? ..............169 SYSTem:SERial? ..................169 SYSTem:PARameter:SAVE ............... 169 SYSTem:PARameter:LOAD ..............169 SYSTem:PARameter:LOAD? ..............169 STATus:QUEStionable:ENABle ..............170 STATus:QUEStionable:ENABle? ..............
  • Page 140 GDM-8261 User Manual ROUTe:FUNCtion? ................... 172   ROUTe:CHANnel ..................173   ROUTe:CHANnel? ..................173   ROUTe:COUNt ..................173   ROUTe:COUNt? ..................173   ROUTe:DELay ................... 173   ROUTe:DELay? ..................173   ROUTe:STATe? ..................173   ROUTe:ADVance ..................174   ROUTe:ADVance? ..................174  ...

  • Page 141: Configure Commands

    REMOTE CONTROL CONFigure Commands CONFigure:VOLTage:DC Sets measurement to DC Voltage on the first display and specifies range/resolution. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf>| MIN | MAX | DEF)] Example: CONF:VOLT:DC 1,MAX Sets the voltage range to 1 volt and the resolution to the maximum. CONFigure:VOLTage:AC Sets measurement to AC Voltage on the first display and specifies range/resolution.
  • Page 142 GDM-8261 User Manual CONFigure:FRESistance Sets measurement to 4W Resistance on the first display and specifies the range/resolution. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf> | MIN | MAX | DEF)] Example: CONF:FRES 10e3,MAX Ω Sets the measurement mode to 4W with a range of 10k at the maximum resolution.

  • Page 143: Secondary Display: Configure2 Commands

    REMOTE CONTROL CONFigure:TEMPerature:RTD Sets the measurement mode to 2W RTD measurement mode on the first display. Sets the sensor type. Parameter: [None] | [Type(PT100 | D100 | F100 | PT385 | PT3916 | USER)] Example: CONF:TEMP:RTD PT100 Sets the sensor type to PT100 and sets the measurement mode to 2W RTD CONFigure:FUNCtion? Returns the current function on 1st display.
  • Page 144 GDM-8261 User Manual CONFigure2:VOLTage:AC Sets measurement to AC Voltage on the second display and specifies range/resolution. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf> | MIN | MAX | DEF)] Example: CONF2:VOLT:AC Sets the measurement mode to AC voltage.
  • Page 145 REMOTE CONTROL CONFigure2:FREQuency Sets measurement to Frequency on the second display and specifies range/resolution. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf> | MIN | MAX | DEF)] Example: CONF2:FREQ MAX,MAX Sets the frequency measurement range to max and the resolution to max. CONFigure2:PERiod Sets measurement to Period on the second display and specifies the range/resolution.

  • Page 146: Measure Commands

    GDM-8261 User Manual Measure Commands MEASure:VOLTage:DC? Returns the DC voltage measurement on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf>| MIN | MAX | DEF)] Example: MEAS:VOLT:DC ? >+0.488E-4 Returns the DC voltage measurement as 0.0488 mV.
  • Page 147 REMOTE CONTROL MEASure:FRESistance? Returns the 4W resistance measurement on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf>| MIN | MAX | DEF)] Example: MEAS:FRES? > +1.181372E+6 Returns the 4W measurement. MEASure:FREQuency? Returns the frequency measurement on the first display. Parameter: [None] | [Range(<NRf>...
  • Page 148 GDM-8261 User Manual MEASure:TEMPerature:FRTD? Returns the 4W RTD temperature for the selected sensor type on the first display. Parameter:[NONE] | PT100 | D100 | F100 | PT385 | PT3916 | USER Example: MEAS:TEMP:FRTD? PT100 > +0.20050E+5 Returns the temperature. MEASure:TEMPerature:RTD? Returns the 2W RTD temperature for the selected sensor type on the first display.

  • Page 149: Sense Commands

    REMOTE CONTROL MEASure2:RESistance? Returns the 2W resistance measurement on the second display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF),Resolution(<NRf>| MIN | MAX | DEF)] Example: MEAS2:RES? > +1.181372E+6 Returns the 2W measurement. MEASure2:FRESistance? Returns the 4W resistance measurement on the second display. Parameter: [None] | [Range(<NRf>...
  • Page 150 GDM-8261 User Manual [SENSe:]TEMPerature:RJUNction:SIMulated Set temperature simulation value. Parameter: <NRf>(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:]TEMPerature:RTD:TYPE Sets the 2W RTD sensor type.
  • Page 151 REMOTE CONTROL [SENSe:]TEMPerature:FRTD:TYPE Sets the 4W RTD sensor type. Parameter: Type(PT100 | D100 | F100 | PT385 | PT3916 | USER) Example: SENS:TEMP:FRTD:TYPE PT100 Sets the 4W RTD sensor to PT100 [SENSe:]TEMPerature:FRTD:TYPE? Returns the 4W RTD sensor type. Return parameter: PT100, D100, F100, PT385, PT3916, USER [SENSe:]TEMPerature:FRTD:ALPHa Sets the 4W RTD Alpha coefficient.
  • Page 152 GDM-8261 User Manual [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) [SENSe:]AVERage:COUNt Sets the digital filter count.
  • Page 153 REMOTE CONTROL [SENSe:]PERiod:APERture? Returns the aperture time (gate time) for the period function. [SENSe:]FREQuency:INPutjack Assigns an input port for the frequency function. Parameter: (0|1|2) 0=volt, 1=1A, 2=10A Example: SENS:FREQ:INP 0 Sets the input jack to the Volt input port. [SENSe:]FREQuency:INPutjack? Returns the assigned input port used for the frequency function.
  • Page 154 GDM-8261 User Manual [SENSe:]GAIN:AUTO? Returns the Auto gain mode. Return parameter: 0|1, 1=ON, 0=OFF [SENSe:]CONTinuity:THReshold Sets the continuity threshold in ohms. Parameter: <NRf> (0 ~ 1000) Example: SENS:CONT:THR 500 Sets the continuity threshold to 500 [SENSe:]CONTinuity:THReshold? Returns the continuity threshold.
  • Page 155 REMOTE CONTROL [SENSe:]FUNCtion[1/2] Sets the function for the first or second display. Parameter: “VOLT[:DC]”, “VOLT:AC”, “CURR[:DC]”, “CURR:AC”, “RES”, “FRES”, “FREQ”, ‘PER”, “TEMP:RTD”, “TEMP:TCO”, “DIOD”, “CONT”, “NON” (2nd display only) Example: SENS:FUNC1 “VOLT:DC” Sets the 1 display to the VDC function. [SENSe:]VOLTage:DC:RANGe Sets the DC Voltage measurement range.
  • Page 156 GDM-8261 User Manual [SENSe:]RESistance:RANGe Sets the 2W resistance measurement range. Parameter: Range(<NRf> | MIN | MAX) Example: SENS:RES:RANG 1000 Sets the resistance range to 1kΩ. [SENSe:]RESistance:RANGe? Returns the 2W resistance measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]FRESistance:RANGe Sets the 4W resistance measurement range.
  • Page 157 REMOTE CONTROL [SENSe:]VOLTage:DC:RANGe:AUTO? Returns the DC voltage Auto-range settings. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]VOLTage:AC:RANGe:AUTO Sets the AC voltage Auto range on/off. Parameter: ON|OFF Example: SENS:VOLT:AC:RANG:AUTO ON Turns Auto-range on for AC voltage measurements. [SENSe:]VOLTage:AC:RANGe:AUTO? Returns the AC voltage Auto-range settings. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]CURRent:DC:RANGe:AUTO Sets the DC Current Auto-range settings on/off.
  • Page 158 GDM-8261 User Manual [SENSe:]FRESistance:RANGe:AUTO Sets the 4W resistance Auto-range settings on/off. Parameter: ON|OFF Example: SENS:FRES:RANG:AUTO ON Turns Auto-range on for 4W resistance measurements. [SENSe:]FRESistance:RANGe:AUTO? Returns the 4W resistance Auto-range setting. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]FREQuency:VOLTage:RANGe:AUTO Sets the Frequency Auto-range settings on/off.
  • Page 159 REMOTE CONTROL [SENSe:]VOLTage:AC:RESolution? Returns the AC Voltage resolution. Parameter: [None] | [MIN | MAX] [SENSe:]CURRent:DC:RESolution Sets the DC Current measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution(<NRf> | MIN | MAX) Example: SENS:CURR:DC:RES 0.01 Sets the DC Current resolution to 0.01 [SENSe:]CURRent:DC:RESolution? Returns the DC Current resolution.
  • Page 160 GDM-8261 User Manual [SENSe:]CONTinuity:RESolution Sets the Continuity measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution(<NRf> | MIN | MAX) Example: SENS:CONT:RES 0.001 Sets the Continuity resolution to 0.001 [SENSe:]CONTinuity:RESolution? Returns the Continuity measurement resolution. Parameter: [None] | [MIN | MAX] [SENSe:]DIODe:RESolution Sets the Diode measurement resolution.
  • Page 161 REMOTE CONTROL [SENSe:]TEMPerature:RTD:RESolution Sets the 2W RTD measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution(<NRf> | MIN | MAX) Example: SENS:TEMP:RTD:RES MAX Sets the 2W RTD resolution to the maximum. [SENSe:]TEMPerature:RTD:RESolution? Returns the 2W RTD measurement resolution. Parameter: [None] | [MIN | MAX] [SENSe:]VOLTage:DC:NPLCycles Sets the integration time for DC Voltage measurements in PLCs (power line...

  • Page 162: Calculate Commands

    GDM-8261 User Manual [SENSe:]RESistance:NPLCycles? Returns the integration time for 2W resistance measurements in PLCs (power line cycles). Where one PLC is equal to 16.6 milliseconds. Return parameter: 0.025, 0.1, 0.25, 1, 2, 12 [SENSe:]FRESistance:NPLCycles Sets the integration time for 4W resistance measurements in PLCs (power line cycles).
  • Page 163 REMOTE CONTROL CALCulate:HOLD:REFerence Sets the percentage threshold for the Hold function. Parameter: <NRf> (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: <NRf>...
  • Page 164 GDM-8261 User Manual CALCulate:DBM:REFerence Sets the reference value for the dBm function. Parameter: <NRf> | MIN | MAX Example: CALC:DBM:REF MAX Sets the reference value for dBm measurements to the maximum allowed. CALCulate:DBM:REFerence? Returns the reference value from the dBm function.

  • Page 165: Trigger Commands

    REMOTE CONTROL CALCulate:MATH:MMFactor Sets the scale factor M for math measurements. Para meter: <NRf> | MIN | MAX 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. CALCulate:MATH:MBFactor Sets the offset factor B for math measurements.
  • Page 166 GDM-8261 User Manual VAL2? Returns the 2 display reading in the unit format specified in the Configuration menu (Return Format, page 130) or from the SYSTem:OUTPut:FORMat command (page 168). Example: SAMP:COUN 100 VAL2? >+0.345E-4,V DC >+0.391E-4,V DC > etc, for 100 counts.
  • Page 167 REMOTE CONTROL SAMPle:COUNt? Returns the number of samples. Parameter: None | MIN | MAX TRIGger:COUNt Sets the number of trigger counts. Parameter: <NR1>(1 ~ 9999) | MIN | MAX Example: TRIG:COUN 10 Sets the number of trigger counts to 10. TRIGger:COUNt? Returns the number of trigger counts.

  • Page 168: System Related Commands

    GDM-8261 User Manual SYSTem Related Commands SYSTem:BEEPer:STATe Selects the beeper mode; no beep, beep on fail and beep on pass. Parameter: <NR1>(0 | 1 | 2) 0=no beep, 2=fail, 1=pass Example: SYST:BEEP:STAT 0 Turns the beeper off. SYSTem:BEEPer:STATe? Returns the beeper mode.
  • Page 169 REMOTE CONTROL SYSTem:OUTPut:FORMat? Returns the output format. Return parameter: (0|1|2) 0=V, 1=V+U, 2=V+C, 3=V+U+C SYSTem:OUTPut:EOF Sets the EOL character (CR+LF, LF, CR). Parameter: <NR1>(0 | 1 | 2) (0=CR+LF, 1=LF, 2=CR) Example: SYST:OUTP:EOF 0 Sets the EOL character as CR+LF. SYSTem:OUTPut:EOF? Returns the EOL character.

  • Page 170: Status Report Commands

    GDM-8261 User Manual 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 register. STATus:QUEStionable:EVENt? Returns the contents of the Questionable Data Event register. STATus:PRESet Clears the Questionable Data Enable register.
  • Page 171 Example: *SRE 7 Sets the SRER to 00000111. *STB? Returns the SBR (Status Byte Register) contents. Example:*STB? >81 Returns the contents of the SBR as 01010001. *TRG Manually triggers the GDM-8261. GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 172: Route Commands

    GDM-8261 User Manual ROUTe Commands ROUTe:CLOSe Close a specified scanner channel. Parameter: <NR1>(101~118) Example: ROUT:CLOS 102 Closes channel 102. ROUTe:OPEN:ALL Opens all scanner channels. ROUTe:MULTiple:OPEN Enable all channels in a specified range. Channels that are not in the range are not affected.
  • Page 173 REMOTE CONTROL ROUTe:CHANnel Advanced configuration mode for the scanner channels. The channel function, voltage and Auto-range mode can be configured. Parameter: Channel(<NR1>), Function(String), Range(<NRf>), Auto Function: 1(VOLT), 2(VOLT:AC), 3(CURR [DCI]), 4(CURR:AC [ACI]), 5 (CURR [DCmA]), 6 (CURR:AC [ACmA]), 7(RES), 8(FREQ), 9(TEMP:TCO:C), 13(CONT), 14(PER), 15(TEMP:TCO:F), 16(FRES), 17(DIOD), 18(TEMP:RTD:C), 19(TEMP:FRTD:C), 20(TEMP:RTD:F), 21(TEMP:FRTD:F) Range: <NRf>...
  • Page 174 GDM-8261 User Manual ROUTe:ADVance Turns the scanner Advanced mode on/off. Parameter: ON|OFF Example: ROUT:ADV OFF Turns advanced scanner mode off. ROUTe:ADVance? Returns the advanced mode status (on/off). Return parameter: ON|OFF ROUTe:SCAN:COUNt? Returns the current scan count number. Return parameter: <NR1>(1~999) ROUTe:SCAN:FINal Configures the DMM to send a “Scan OK”...
  • Page 175 REMOTE CONTROL FETCh? Transfer the stored readings to the output buffer. DATA:POINts? Returns the number of readings. Parameter: None | <NR1> (0~2) 0=Store, 1=Scan, 2=Stats GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 176: 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 not match the specifications. What is the Output key used for? The Output key is used for turning the display output on or off as well as locking the front panel keys on/off.

  • Page 177: Appendix

    APPENDIX PPENDIX System Info Firmware Version ..........178 Fuse Replace AC Source Fuse ........179 Replacement Replace Input Current Fuse ........180 Menu Tree Menu Tree.............181 Specifications General ..............183 DC Characteristics ..........184 AC Characteristics ..........186 Frequency and Period Characteristics ....189 Temperature Characteristics .........190 Dimensions ............191 EC Declaration EC Declaration of Conformity .......192...

  • Page 178: Firmware Version

    GDM-8261 User Manual Firmware Version Firmware version is available from the system menu. Background Shows the GDM-8261firmware version Firmware number. version 1. Press the Shift key followed by MENU View firmware the 2nd (Menu) key. The system version menu appears.

  • Page 179: Fuse Replacement

    APPENDIX Fuse Replacement Replace AC Source Fuse 1. Take off the power Steps cord and remove the fuse socket using a minus driver. 2 40 2. Replace the fuse in the holder. 2 2 0 3. Ensure the correct line 2 4 0 voltage is lined up with 2 2 0...

  • Page 180: Replace Input Current Fuse

    GDM-8261 User Manual Replace Input Current Fuse 1. Press the Fuse holder. Step 2. The fuse holder comes out. Replace the fuse inserted at the end of the holder. T1.25A, 250V Rating GlobalTestSupply www. .com Find Quality Products Online at:...

  • Page 181: Menu Tree

    APPENDIX Menu Tree Menu Tree The menu tree diagram shown on the next page Background represents the configuration menu that is accessed by pressing the Shift key and 2ND (Menu) key. The menu tree is arranged as a three-level tree structure. Menu Tree Navigation Continued next page.
  • Page 182 GDM-8261 User Manual Configuration Menu Tree SHIFT/ EXIT MENU LEVEL 1 SYSTEM MEAS SET ADC HZ/P TX/TERM SCAN LEVEL 2 SIMPLE ADVAN MONITOR MIN CH MIN CH CH 01 MAX CH MAX CH TIMER TIMER CH 18 COUNT COUNT LEVEL 2...

  • Page 183: Specifications

    APPENDIX Specifications General All specifications are ensured only under a single display.  At least 1 hour of warm-up time is required before  applying these specifications. (Auto-Zero on, Auto-Gain Note on, Slow mode) Make sure the power ground is connected. ...

  • Page 184: Dc Characteristics [1]

    GDM-8261 User Manual DC Characteristics DC Voltage 24 Hour 90 Day 1 Year Temperature Range 23˚C±1˚C 23˚C±5˚C 23˚C±5˚C Coefficient/˚C 100.0000 mV 0.0030 + 0.0030 0.0040 + 0.0035 0.0050 + 0.0035 0.0005 + 0.0005 1.000000 V 0.0015 + 0.0004 0.0020 + 0.0005 0.0035 + 0.0005...
  • Page 185 APPENDIX Measuring Characteristics DC Voltage Input Resistance Range 10MΩ or >10GΩ 0.1V Selectable 10MΩ or >10GΩ Selectable 11.11MΩ ±1% 100V 10.1MΩ±1% 1000V 10.1MΩ±1% Input Bias 30pA (Typ, 25°C) Input Protection 1000V on all ranges Measurement Method: Sigma-delta A/D Converter Resistance Max.

  • Page 186: Ac Characteristics

    [ 7 ] When making 4W resistance measurements please note the following: Due to the Seebeck effect, please insert the banana plugs of the 4W test cables into the dedicated female terminals on the GDM-8261 and wait for the terminals and banana plugs to reach an equilibrium temperature.
  • Page 187 APPENDIX 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 10Hz – 5kHz 0.15 + 0.06 0.15 + 0.06 0.15+0.06 0.015+0.006 5kHz – 10kHz 0.35 + 0.7 0.35 + 0.7 0.35+0.7 0.03+0.006...
  • Page 188 GDM-8261 User Manual Measuring Characteristics True RMS AC Measurement AC-coupled True RMS – measures the ac Voltage Method: component of input with up to 400 Vdc of bias on any range. Crest Factor Maximum 5:1 at full scale AC Filter Slow 3 Hz –...

  • Page 189: Frequency And Period Characteristics

    APPENDIX Frequency and Period Characteristics Frequency Period 24 Hour 90 Day 1 Year Temperature Range Frequency 23˚C±1˚C 23˚C±5˚C 23˚C±5˚C Coefficient/˚C 100 mV 3Hz - 5Hz 0.005 5Hz - 10Hz 0.05 0.05 0.05 0.005 750 V 10Hz - 40Hz 0.03 0.03 0.03 0.001 40Hz - 300kHz 0.006...

  • Page 190: Temperature Characteristics

    GDM-8261 User Manual Temperature Characteristics (Display in °C, °F, Exclusive of probe errors.) RTD (Accuracy based on PT100): (100Ω platinum [PT100], D100, F100,PT385, PT3916, or user type) Temperature Coefficient Range Resolution 1 Year (23°C ±5°C)* 0°-18°C & 28°-55°C -200°C~ -100°C 0.001°C...

  • Page 191: Dimensions

    APPENDIX Dimensions 264.4 350.3 325.1 76.8 The cave depth 2.5mm M4 X 0.7 4 Places All dimensions are shown in millimeters. 201.9 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 192: Ec Declaration Of Conformity

    GDM-8261 User Manual EC Declaration of Conformity GOOD WILL INSTRUMENT CO., LTD. (1) No.7-1, Jhongsing Rd., Tucheng Dist., New Taipei City, Taiwan (R.O.C.) (2) No. 69, Lu San Road, Suzhou City (Xin Qu), Jiangsu Sheng, China declare, that the below mentioned product...

  • Page 193: Index

    INDEX NDEX Current A  scanner configuration ....... 98 setting ............30 AC bandwidth Current auto-detect setting ............80 input port setting ........82 ADC speed setting ............86 D  Auto-gain setting ............85 setting ............55 Auto-zero Digital filter setting ............83 setting ............
  • Page 194 GDM-8261 User Manual Frequency P  scanner configuration ........ 98 Period setting ............38 scanner configuration ....... 98 Frequency/period setting ............38 gate time setting ........88 input port setting ........87 R  Front panel Rear panel overview ............. 12 overview ............. 17 Fuse Recall instrument settings ......
  • Page 195 INDEX Operating characteristics ....188 Thermocouple junction setting ......... 42 setting ............41 characteristics ........184 Tilt stand ............19 measuring characteristics ....185 Trigger Dimensions ..........191 Frequency and Period delay ............74 external ............72 characteristics ........189 measuring characteristics ....

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