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Dual Measurement Multimeter GDM-8261A USER MANUAL GW INSTEK PART NO. 82DM-8261AEC1 ISO-9001 CERTIFIED MANUFACTURER...
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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.
GDM-8261A in the best possible condition. Safety Symbols These safety symbols may appear in this manual or on the GDM-8261A. Warning: Identifies conditions or practices that could result in injury or loss of life.
DC1000V/AC750V. Make sure the current input level does not exceed 10A. CAUTION Do not place any heavy object on the GDM-8261A. Avoid severe impact or rough handling that can lead to damaging the GDM-8261A. Do not discharge static electricity to the GDM-8261A.
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Humidity: Full accuracy to 80% RH at 40°C (Note) EN 61010-1:2010 specifies the pollution degrees and their requirements as follows. The GDM-8261A 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‖.
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SAFETY INSTRUCTIONS Power cord for the United Kingdom When using the GDM-8261A 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...
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GDM-8261A. 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.
GETTING STARTED GDM-8261A Characteristics The GDM-8261A 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 ...
GDM-8261A User Manual Front Panel Overview Main Measurement Sense HI Display Keys Sense LO Terminal Terminal Input HI INPUT Terminal GDM-8261A SENSE Digit Dual Measurement Multimeter Input LO DC1000V 100Vpk AC 750V 200Vpk Terminal 500Vpk (COM port) 1.2A SHIFT / EXIT...
GETTING STARTED Accepts HI sense line in 4W resistance Sense HI SENSE measurement. For details, see page 34. Terminal Accepts ground (COM) line in all Input LO measurements except the sense line in Terminal 4W Resistance (page 34). The maximum withstand voltage between this terminal and earth is 500Vpk.
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GDM-8261A User Manual Starts the step measurement (page SHIFT / EXIT SHIFT → DCV 113) using the optional scanner. (STEP) STEP Measures AC Current (page 32). Recalls a normal measurement SHIFT / EXIT SHIFT → ACI result, standard deviation (RECALL)
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GETTING STARTED Measures dB (page 59). SHIFT / EXIT SHIFT + Hz/P (dB) Hz/P Measures Temperature (page 43). TEMP TEMP (Temperature) Selects the type of thermocouple SHIFT / EXIT SHIFT + TEMP used in the Temperature (SENSOR) measurement (page 44). SENSOR TEMP...
GDM-8261A User Manual Measurement Keys (lower row) As the AUTO key, selects the AUTO/ENTER AUTO measurement range automatically. ENTER As the Enter key, confirms the entered value. Selects the measurement update SHIFT / EXIT SHIFT → AUTO rate: Slow, Medium, or Fast (page (RATE) 25).
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GETTING STARTED Manually sets the reference value for SHIFT / EXIT SHIFT → REL the Relative value measurement (RELative base) (page 62). REL# Measures the Maximum or the MX/MN MX/MN Minimum value (page 61). (MAX/ MIN) Selects the digital filter type for the SHIFT / EXIT SHIFT →...
GDM-8261A User Manual Rear Panel Overview Digital I/O Optional Power Cord Port Scanner Port Socket 16 CHANNEL MAX. RATING SCANNER 250V , 2A DIGITAL I / O RS232 LINE RATING 50 , 60 , 400Hz 25VA MAX. CAL KEY FUSE...
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GETTING STARTED Accepts a USB device cable for remote USB device port control; Type A, female connector. For remote control details, see page 132. CAL KEY Reserved for internal purposes such as CAL key port firmware updates and calibration. DIGITAL I / O Accepts a digital I/O cable for the Digital I/O port Hi/Lo limit tests;...
GDM-8261A User Manual 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.
3. Push to turn on the main power switch on the front panel. 4. The display shows the model name and the version for a few seconds. Example: GDM-8261A, V1.00 5. Followed by the default measurement settings. 6. And the interface I/O settings.
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GDM-8261A User Manual 7. Then the default setting appears. Example: DCV, Auto, 100mV range AUTO...
BASIC MEASUREMENT ASIC MEASUREMENT 2/4W Hz/P TEMP Overview Basic Measurement Overview ........ 25 Refresh Rate ............25 Reading Indicator ........... 26 Manual/Automatic Triggering ........ 27 Voltage AC/DC Voltage Measurement ......... 27 Select Voltage Range ..........28 Voltage Conversion Table ........30 Crest Factor Table ...........
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GDM-8261A User Manual Temperature Temperature Measurement ........43 Select Thermocouple Type ........44 Set Reference Junction Temperature (T-CUP) ..45 Select Temperature Sensor Type ......46 Set User RTD ............47...
Refresh Rate Refresh rate defines how frequently the GDM-8261A 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.
GDM-8261A 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 SHIFT / EXIT the AUTO (RATE) key. The AUTO refresh rate switches to the next.
BASIC MEASUREMENT Manual/Automatic Triggering The GDM-8261A 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 TRIG measurement manually. The trigger triggering must be set to external (EXT) for manual triggering.
GDM-8261A User Manual Select Voltage Range To turn the automatic range selection Auto range AUTO 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.
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BASIC MEASUREMENT The DC voltage range should be manually selected when any of the following conditions are true: 1. When DCV measurement is used. 2. When the signals being measured contain both DC and AC components. 3. When the amplitude of the AC component in the measured signal is higher or lower than the dynamic range of the range being currently selected by auto-range function.
GDM-8261A 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...
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.
GDM-8261A User Manual AC/DC Current Measurement The GDM-8261A has two input ports for current Background measurement. A 1A terminal for current less than 1.2A and a 10A port for measurements up to 10A. The GDM-8261A also features a ―Current Input Port Auto-Detect‖...
BASIC MEASUREMENT Select Current Range To turn the automatic range Auto range AUTO 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.
GDM-8261A User Manual The DC current range should be manually selected when the following conditions are true: 1. When DCI measurement is used. 2. When the signals being measured contain both DC and AC components. 3. When the amplitude of the AC component in the...
BASIC MEASUREMENT AUTO 2. 2W/4W resistance mode display appears 2W or 4W + Ω Indicates 2W or 4W Resistance mode AUTO Indicates Automatic range selection 2nd display shows the Resistance range Connect the test lead. For 2-wire resistance, use the Ω (V) 3.
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GDM-8261A User Manual 10Ω 11.99999MΩ 10MΩ 100Ω 119.9999MΩ 100MΩ Note For more detailed range, see the specifications at page 217.
BASIC MEASUREMENT 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 Indicates Diode test DIODE 2nd display shows the title...
GDM-8261A User Manual 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...
BASIC MEASUREMENT 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 SHIFT / EXIT MENU 1. Press the Shift key, the 2nd key, 1.
GDM-8261A User Manual Select Beeper Setting Beeper setting defines how the GDM-8261A 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...
BASIC MEASUREMENT Frequency/Period Measurement To measure Frequency, press the 1. Activate Hz/P Hz/P key once. frequency/period measurement To measure the Period, press the Hz/P Hz/P Hz/P key twice. AUTO 2. Frequency (Period) mode display appears Hz (S) Indicates Frequency (period) measurement AUTO Indicates Automatic range selection FREQ...
GDM-8261A User Manual 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 AUTO selection On/Off, press the AUTO key. Press the Up or the Down key to Manual range select the range.
BASIC MEASUREMENT Temperature Measurement The GDM-8261A can measure temperature using either Background thermocouples or RTD sensors. For thermocouples, the GDM-8261A accepts a thermocouple input and calculates the temperature from the voltage fluctuation. The thermocouple type and reference junction temperature are also considered.
GDM-8261A User Manual Select Thermocouple Type The GDM-8261A accepts 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 Resolution -200 to +1000°C 0.002 °C -210 to +1200˚C 0.002 °C...
Set Reference Junction Temperature (T-CUP) When a thermocouple is connected to the GDM-8261A, Background the temperature difference between the thermocouple lead and the GDM-8261A input terminal should be taken into account and be cancelled; otherwise an erroneous temperature might be added. Type...
SHIFT / EXIT (cancel) Select Temperature Sensor Type The GDM-8261A 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. Parameter RTD type...
BASIC MEASUREMENT 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 SHIFT / EXIT AUTO Press the Exit key to go back to the...
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GDM-8261A User Manual Press the Down key twice. The RTD selection menu appears on the display. Use the Up/Down keys to select USER. Press Enter. The alpha coefficient 3. Open USER AUTO menu appears on the display. type menu ENTER Use the Left/Right key to move the 4.
DUAL MEASUREMENT 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.
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GDM-8261A User Manual Amplifier Output INPUT AC Noise DC offset DC Power Supply Output INPUT AC ripple Power Supply DC output Monitor the voltage and current present on a component in a circuit or the output voltage and current of a DC power supply.
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DUAL MEASUREMENT 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. Frequency Response INPUT The following table shows the available measurement...
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GDM-8261A User Manual 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...
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DUAL MEASUREMENT 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. Voltage and Frequency/Period Measurement INPUT 2W/4W Resistance Measurement INPUT...
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GDM-8261A User Manual Voltage/Frequency/Period and Current Measurement INPUT Load 0~1.2A 0~10A Note: DC Current measurements will be displayed as a negative value as the polarity of the current leads has been reversed. Please take into account the resistance of the test leads and internal resistance of the current connection as it is in series with the test circuit.
● ● — Math Refresh Rate Refresh rate defines how frequently the GDM-8261A 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.
(slower than the normal captured refresh rate), indicating the DMM is in the waiting mode. Common Attribute: Manual/Automatic Triggering The GDM-8261A triggers according to the refresh rate. Automatic See the previous page for refresh rate setting details. triggering...
See page 76. dBm/dB/W Measurement Applicable to Using the ACV or DCV measurement result, the Background GDM-8261A calculates the dB, dBm or W value based on a reference resistance value in the following way. 10 x log (1000 x Vreading / Rref) dBm –...
Measure dB dB is defined as [dBm−dBmref]. When the dB Background measurement is activated, the GDM-8261A calculates the dBm using the reading at the first moment and stores it as dBmref. SHIFT / EXIT Press the Shift key followed by the Activate dB Hz/P key.
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GDM-8261A User Manual dB result appears Indicates dB measurement -00.617mV Indicates the present Voltage reading Press the 2nd key to see the dBm dBmref ref value. To cancel the dB measurement, SHIFT / EXIT Deactivate dB press the Shift key followed by the...
ADVANCED MEASUREMENT Max/Min Measurement Applicable to 2/4W Hz/P TEMP 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.
GDM-8261A User Manual Relative Value Measurement Applicable to 2/4W Hz/P TEMP Relative measurement stores a value, typically the data at the Background moment, as the reference. The following measurement is shown as the delta between the reference. The reference value will be cleared upon exit.
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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 HOLD TRIG move the flashing point (cursor), and use the Up/Down key to change the value.
GDM-8261A User Manual Hold Measurement Applicable to 2/4W Hz/P TEMP 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.
ADVANCED MEASUREMENT Compare Measurement Applicable to 2/4W Hz/P TEMP 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 COMP 1. Activate SHIFT / EXIT (Comp) key.
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GDM-8261A 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 HOLD TRIG the cursor (flashing point) between high/low setting, digits, and decimal point.
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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.
GDM-8261A User Manual Math Measurement Applicable to 2/4W Hz/P TEMP 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).
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ADVANCED MEASUREMENT 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm AUTO editing and move to offset ENTER setting. 3. Set the offset Shows the offset (B) 1st display Indicates MX+B (The letter B flashes) 2nd display 1.
GDM-8261A User Manual Measure 1/X Press the Shift key, the 2/4W (Math) 1. Activate 1/X MATH SHIFT / EXIT 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 AUTO measurement result.
ADVANCED MEASUREMENT 1. Use the Left/Right key to move HOLD TRIG 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 AUTO editing. ENTER AUTO 3.
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GDM-8261A User Manual Press the Enter key to set the 2. Set Count AUTO number of measurements (counts) ENTER 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.
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ADVANCED MEASUREMENT 3. Press the Enter key to confirm AUTO editing and to start ENTER measurement. AUTO 3. View Data MATH 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.
SYSTEM/DISPLAY CONFIGURATION Refresh Rate Setting Refresh rate defines how frequently the GDM-8261A 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.
See below triggering for details. Use External Trigger The GDM-8261A 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.
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SYSTEM/DISPLAY CONFIGURATION DB-9, female Digital I/O pin High Limit FAIL Out LOW Limit FAIL Out assignment FAIL Out EOM Out 7 8 9 1 2 3 4 5 VCC Out PASS Out External Trigger In Digital (chassis) Ground Press the Shift key followed by the 1.
GDM-8261A User Manual Set Trigger Delay Trigger delay defines the time delay between triggering Background and measurement start. The default is set at 10ms. 1. Press the Shift key, the 2nd MENU Panel operation SHIFT / EXIT (Menu) key, the Right key, the Down key.
SYSTEM/DISPLAY CONFIGURATION Filter Setting Digital Filter Overview The GDM-8261A’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.
GDM-8261A User Manual Filter count defines the number of samples to be Filter count averaged per reading. More samples offer low noise but a long delay. Less samples offer high noise but a short delay. 2 ~ 100 Range Filter window defines the threshold for when the digital Filter window filter data is updated again.
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SYSTEM/DISPLAY CONFIGURATION 2. Select the filter type using the Up/Down key. 3. Move the cursor to filter count HOLD TRIG using the Left/Right key. Change the value using the Up/Down key. 4. Press the Enter key to confirm Set Filter Window AUTO editing.
GDM-8261A User Manual Analog Filter Settings The analog filter is a single order low pass filter that can Background be turned on to attenuate the AC components from a DC signal. This will effectively eliminate the AC component from influencing the automatic range settings.
SYSTEM/DISPLAY CONFIGURATION 6. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display. Display Setting Display Light Setting The display light setting adjusts the brightness of the Background display reading.
GDM-8261A User Manual 4. Select the level using the Up/Down key. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display. Measurement Configuration Settings D-Shift Settings...
SYSTEM/DISPLAY CONFIGURATION Shows the D-Shift setting 1st display 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
GDM-8261A User Manual Shows the input resistance setting 1st display 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
SYSTEM/DISPLAY CONFIGURATION 3. Press the Down key. The input bandwidth setting appears. Shows the bandwidth setting 1st display 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
Auto zeroing is used to prevent measurements from drifting by taking offset measurements. Off, On (default=On) 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-8261A, the offsets for the...
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SYSTEM/DISPLAY CONFIGURATION Buffer, A/D driver and ADC vary over time, and thus the total offset will also vary over time. Auto Zero deducts this total offset from the measured signal to obtain a more accurate reading. If Auto Zero is turned off, this total offset will not be deducted from the measured signal.
GDM-8261A User Manual Shows A-Zero setting 1st display 3. Select the setting using the Up/Down key. 4. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
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SYSTEM/DISPLAY CONFIGURATION 2. Press the Down key and then HOLD the Left key twice to choose A-GAIN. Press the Down key. HOLD The A-GAIN setting appears. Shows A-Zero setting 1st display 3. Select the setting using the Up/Down key. 4. Press the Enter key to confirm SHIFT / EXIT AUTO...
GDM-8261A 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.
SYSTEM/DISPLAY CONFIGURATION 4. Use the Up/Down keys to select either ACCUR or QUICK. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER 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...
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GDM-8261A User Manual 4. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
SYSTEM/DISPLAY CONFIGURATION 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. 10ms, 100ms, 1000ms Setting The gate time settings are analogous to the rate settings. Rate Settings Function Digits...
GDM-8261A User Manual Identification Settings Changing the Identification String The *IDN? query returns the manufacturer, model Background number, serial number and system firmware version number. When LANG is set to COMP, a user defined manufacturer and model number is returned with the *IDN? query.
STORE/RECALL TORE/ ECALL The GDM-8261A can store and recall measurement history (for up to 9999 counts) as well as the instrument settings. For storing and recalling measurement results using the Scanner, see page 103. STORE RECALL Store Measurement Record ........98 Recall Measurement Record ........
GDM-8261A User Manual Store Measurement Record The GDM-8261A can log up to 9999 measurement Background results (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.
STORE/RECALL Recall Measurement Record The GDM-8261A 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 Not applicable to...
GDM-8261A User Manual Save Instrument Settings The GDM-8261A 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...
STORE/RECALL 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 SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to the default display.
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GDM-8261A User Manual 3. Press the Down key to enter the Recall menu. Shows the memory number 1st display 4. Select the memory number using the Up/Down key. 5. Press the Enter key to confirm SHIFT / EXIT AUTO your selection. Press the Exit ENTER key to go back to Recall menu.
GDM-8261A User Manual GDM-SC1 Scanner Specifications 16 pairs 2Arms (ch17, 2-wire channel Maximum current ch18) 8 pairs 2/4 wire 4-wire channel Resistance N/A (internal) Single wire channel Cold junction 250Vrms Screw terminal Maximum voltage Connection Scanner Installation Configure Scanner 1. Take off four screws from the bottom panel of the Open Scanner scanner.
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SCANNER (OPTIONAL) 3. The connection terminals are revealed. 16 general purpose channels are available, 8 on the left Overview row, 8 on the right row. Current (ACI, DCI) measurement uses 2 extra channels. All channels are fully isolated (Hi and Lo). Refer to the below table for measurement and test line Scan/Step connections.
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-8261A does not support the SLAVE operation mode with the optional scanner. CH201-218 SLAVE CH101-118...
SCANNER (OPTIONAL) Set the jumper J9 on the rear side of the board Enable scanner accordingly. Move the jumper up (pins 3-2) to disable the (Jumper J9) scanner, and down (pins 2-1) to enable the scanner. Disabled Enabled Connect Wires Make sure the wires have at least the same voltage and Wire selection current capacity as the maximum ratings of the...
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GDM-8261A User Manual 2. Route the wires as shown below via the two openings (left and right) at the front cover. When using thermocouple wiring, please use extension wires so that the cold junction points are Note external to the scanner card. Connecting...
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SCANNER (OPTIONAL) 4. Close the top cover and tighten the screw from the bottom. Print out the configuration record list on page 112, fill in Configuration the details, and keep it with the GDM-8261A. Record...
GDM-8261A User Manual Insert Scanner 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 slot cover. Keep the screws for later reuse.
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SCANNER (OPTIONAL) Insert the scanner bottom-side-up (already configured Insert the according to the procedures on page 104) into the slot. scanner Close the cover by tightening the screws. Connect the power cord and turn On the power. Power On Do not input voltages exceeding 250Vrms to the front input terminals while the scanner module is installed.
GDM-8261A User Manual 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...
(Continuous) end of the loop count. Then it goes into the idle mode. The GDM-8261A stays in the idle mode External by default. The trigger timing is manually (Manual) controlled by the user from the front panel using the Trig key.
GDM-8261A User Manual Trigger delay time Scan Timer Timer Timer Count# 10 11 12 Delay Delay Delay Example: Scan channels 1~4 with a count setting of 12. Measures a single channel in the specified Step range (Channel MIN~MAX)at each trigger event. Timer settings (page 115) apply for each channel.
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SCANNER (OPTIONAL) 3. Press the Down key again. The Starting (Minimum) channel setting appears. 4. Move the cursor to the channel HOLD TRIG using the Left/Right key, and change the value using the Up/Down key. 101 ~ 118 Range 5. When finished, press the Enter AUTO key.
GDM-8261A User Manual 9. Press the Enter key. The loop AUTO (step) Count setting appears. ENTER 10. Move the cursor to the count HOLD TRIG number using the Left/Right key, and change the value using the Up/Down key. 1 ~ 999 Range 11.
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SCANNER (OPTIONAL) 4. Move the cursor to the channel HOLD TRIG using the Left/Right key, and change the value using the Up/Down key. 101 ~ 118 Range 5. When finished, press the Enter AUTO key. The End (Maximum) ENTER channel setting appears. 6.
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GDM-8261A User Manual 1 ~ 999 Range 10. Move the cursor to the count HOLD TRIG number using the Left/Right key, and change the value using the Up/Down key. 11. When finished, press the Enter AUTO key. The channel setting appears.
SCANNER (OPTIONAL) Use External Trigger The GDM-8261A 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...
GDM-8261A User Manual Run Scan Overview Measures all the specified channel ranges Scan operation Scan at each trigger event. The timer settings type (page 115) apply to each scan. Measures a single channel in the specified Step range at each trigger event. The timer settings (page 115) apply to each channel.
SCANNER (OPTIONAL) Recall Scan/Step Result 1. After the Scan/Step is RECALL Panel operation SHIFT / EXIT 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.
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GDM-8261A User Manual 3. Press the Down key. The channel selection appears. 4. Move the cursor to the channel HOLD TRIG using the Left/Right key, and change the channel number using the Up/Down keys. 5. When finished, press the Enter AUTO key.
DIGITAL I/O 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 ...... 124 configuration Application Application: Compare measurement ....125 Application: External trigger ......... 128...
GDM-8261A User Manual 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.
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DIGITAL I/O PASS signal Output. Activates when the Pin5 compare result is PASS. 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.
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GDM-8261A User Manual 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm AUTO editing and move to the low ENTER limit setting. 3. Low limit setting Shows the low limit value 1st display Indicates low limit setting...
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DIGITAL I/O 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.
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GDM-8261A User Manual Application: External trigger The GDM-8261A 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.
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DIGITAL I/O Press the Trig key to start triggering 2. Start trigger TRIG manually. The indicator turns AUTO 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 INT/EXT Exit external SHIFT...
GDM-8261A User Manual EMOTE CONTROL Overview .............. 132 Interface Configure USB Interface ........132 Configure RS-232C Interface ........ 133 Set the EOL Character .......... 134 Set the Separation Character ....... 135 Set the Return Format .......... 136 Insert GPIB Card ..........138 Configure GPIB Interface ........
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REMOTE CONTROL TRIGger Commands ..........197 SYSTem Related Commands ......... 200 STATus Report Commands ........203 RS-232C Interface Commands ......203 IEEE 488.2 Common Commands ......203 ROUTe Commands ..........205...
REMOTE CONTROL 3. Press the Down key. The USB ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. SHIFT / EXIT AUTO 5. Press the Enter key followed by the Exit key. The USB setting is ENTER stored and the display goes back to the default display.
GDM-8261A User Manual 4. Press the Down or UP keys repeatedly to select the baud rate. 2304001152005760038400192009600 SHIFT / EXIT 5. Press the Enter key followed by AUTO the Exit key. The RS-232 setting ENTER is stored and the display goes back to the default display.
REMOTE CONTROL 1. Press the Shift key, the 2nd MENU Configuration SHIFT / EXIT (Menu) key, the left key repeatedly until the TX TERM configuration menu appears. HOLD 2. Press the Down key. The EOL menu appears. 3. Press the Down key. The EOL selection menu appears.
GDM-8261A User Manual 1. Press the Shift key, the 2nd MENU Configuration SHIFT / EXIT (Menu) key, the left key repeatedly until the TX TERM configuration menu appears. HOLD 2. Press the Down key and then TRIG the Right key. The SEP selection display appears.
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REMOTE CONTROL Format Description Example Value +0.503E-4 Value, Unit +0.503E-4, V DC Value, Count# +0.503E-4, +00001# Value, Unit, Count# +0.503E-4, V DC, V+U+C +00001# 1. Press the Shift key, the 2nd MENU Configuration SHIFT / EXIT (Menu) key, the left key repeatedly until the TX TERM configuration menu appears.
GDM-8261A User Manual 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-8261A for later reuse.
REMOTE CONTROL Connect the power cord and turn On the power. Power On Configure GPIB Interface 1. Press the Shift key, the 2nd MENU GPIB port SHIFT / EXIT (Menu) key, and then the left key configuration repeatedly until the I/O configuration menu appears.
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GDM-8261A User Manual 5. To continue to the GPIB AUTO address configuration, press the ENTER Enter key. The GPIB address configuration menu appears. Shows the GPIB address. 1st display Indicates GPIB address setting 2nd display 6. Change the address using the...
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-8261A for later reuse. optional communication port...
GDM-8261A User Manual Insert the Ethernet card into the slot. Close the cover by Insert the tightening the screws. Ethernet card Connect the power cord and turn on the power. Power On Execute the INIT function to initialize the LAN settings, Initialize see page 154 for details.
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REMOTE CONTROL 2. Press the Down key and the Left key repeatedly until LAN selection display appears. HOLD Note: The LAN menu will be selectable only when the LAN card is installed. 3. Press the Down key. The LAN ON/OFF selection appears. 4.
GDM-8261A User Manual Configure Ethernet Interface (RESET) The RESET command is used to reset the Ethernet card Background when new settings have been made. When the DHCP, IP, subnet, gateway or DNS settings have been edited, use the RESET command to validate the changes and reset the Ethernet card to the new configuration settings.
(see page 38). Configure Ethernet Interface to DHCP The GDM-8261A supports DHCP to have an IP address Background and other configuration parameters automatically assigned by a DHCP server. If the DHCP server is absent, the Ethernet card will automatically assign an IP address between 169.254.1.0 and 169.254.254.255 using...
1. To make any changes take effect, set RESET to YES. 2. Reset LAN See page 144 for details. card Configure Ethernet IP The GDM-8261A supports manually setting of the IP Background addresses, including the subnet mask, gateway and DNS. MENU SHIFT / EXIT 1.
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REMOTE CONTROL 2. Press the Down key and the TRIG Right key twice. The IP selection display appears. TRIG Note: The IP address can only be edited if DHCP is off. 3. Press the Down key. The IP address selection appears. IP2 IP3 The IP address is divided in 4 groups;...
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GDM-8261A User Manual 7. Repeat steps 4 to 6 for IP2, IP3 and IP4. SHIFT / EXIT 8. Press the Exit key to exit from the configuration menu. MENU SHIFT / EXIT 1. Press the Shift key, the 2nd 2. Subnet...
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REMOTE CONTROL 4. Use the Left/Right keys to HOLD TRIG move the cursor to the S1 value and select a digit. 5. Press the Up/Down key to edit the selected digit. 6. Press the Enter key to confirm AUTO and automatically go onto S2. ENTER 7.
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GDM-8261A User Manual 2. Press the Down key and the Right key repeatedly until the GATEWAY selection display TRIG appears. Note: The gateway can only be edited if DHCP is off. 3. Press the Down key. The GATEWAY address selection appears.
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REMOTE CONTROL SHIFT / EXIT 8. Press the Exit key to exit from the configuration menu. MENU SHIFT / EXIT 1. Press the Shift key, the 2nd 4. DNS (Menu) key, and the Left key Configuration repeatedly until the SET LAN HOLD configuration menu appears.
GDM-8261A User Manual 5. Press the Up/Down key to edit the selected digit. 6. Press the Enter key to confirm AUTO and automatically go onto D2. ENTER 7. Repeat steps 4 to 6 for D2, D3 and D4. SHIFT / EXIT 8.
/ EXIT 4. Press the Exit key to exit from the configuration menu. Configure Telnet Port The GDM-8261A can set the telnet port used for virtual Background private networks. By default the telnet port is set to port MENU SHIFT / EXIT 1.
Exit key to confirm and exit ENTER the configuration menu. Return to Initial Settings The INIT function is used to return the GDM-8261A Background back to the original LAN settings. This will also reset the web password back to 123456 if the password has been forgotten.
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REMOTE CONTROL MENU SHIFT / EXIT 1. Press the Shift key, the 2nd Return to Initial (Menu) key, and the Left key Settings repeatedly until the SET LAN HOLD configuration menu appears. Note: SET LAN will only be available after LAN has been activated in the I/O menu, see page 142.
GDM-8261A User Manual If the GDM-8261A is returned to the initial settings, a reset is performed automatically (page 144) after exiting Note the configuration menu. Resetting the Ethernet card takes approximately 5 to 10 seconds. The continuity icon ( ) is used to indicate the status of...
Note password if the password has been forgotten. Remote Terminal Session (Telnet) A terminal application can be used to remotely control Background the GDM-8261A via the telnet protocol. 1. Establish a connection via the Operation Page 141, 142 Ethernet port.
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GDM-8261A User Manual 3. Run this query via the terminal application: *idn? The command will return the instrument manufacturer, model number, serial number and firmware version in the following format: >GWInstek,GDM8261A,00000000,1.0 4. See page 163 for more details on remote commands.
The web control interface allows a web browser to modify parameter settings, remotely operate, control and monitor the GDM-8261A with a virtual front panel that mimics the GDM-8261A front panel interface. Telnet parameters can also be edited by using the web control interface so that...
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2. The virtual control panel appears. 3. All the basic panel operations using the virtual control panel are nearly identical to using the actual GDM-8261A, with a few notable exceptions: The scan function is not accessible. Store/recall is not accessible.
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The current Ethernet settings can be viewed and 3. View and modified from the web control interface. Settings that Modify LAN cannot be edited using the GDM-8261A front panel, Configuration such as the web password, can be edited from the web control interface.
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GDM-8261A User Manual 3. The View & Modify Configuration page allows you View the instrument name, firmware revision of the Ethernet card, IP address and MAC address. Set the IP address to DHCP or static. Configure the module host name, UPnP port number, telnet port number and telnet timeout time.
Any NR1,NR2 or NR3 value. The GDM-8261A automatically translates MIN, MAX to the Minimum (min) or Maximum (max) value available. Default setting value. The GDM-8261A automatically translates the command Automatic parameter into the closest available value. parameter range CONF:VOLT:DC 1 (Sets the selection...
GDM-8261A User Manual Command separator, user configurable EOL or , Message (excluding GPIB), see page 135. Separator Square brackets denote function Square Brackets commands or parameters that can be omitted from the command or query. For example the query, [SENSe:]UNIT?
GDM-8261A User Manual 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.
REMOTE CONTROL 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.
GDM-8261A User Manual 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.
REMOTE CONTROL 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. CONFigure2:CURRent:DC Sets measurement to DC Current on the second display and specifies range/resolution.
GDM-8261A User Manual 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.
REMOTE CONTROL 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. MEASure:VOLTage:AC? Returns the AC voltage measurement on the first display.
GDM-8261A User Manual 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.
REMOTE CONTROL 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.
GDM-8261A User Manual 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.
REMOTE CONTROL [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. Parameter: <NR1>...
GDM-8261A User Manual [SENSe:]FILTer:STATe Turns the analog filter On/Off. Parameter: ON | OFF Example: SENS:FILT:STAT ON Turns the analog filter on. [SENSe:]FILTer:STATe? Returns the state of the analog filter (on or off). Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]FREQuency:APERture Sets the aperture time (gate time) for the frequency function (0.01=F, 0.1=M, 1=S).
REMOTE CONTROL [SENSe:]PERiod:INPutjack? Returns the assigned input port used for the period function. Return Parameter: VOLT, 1A, 10A [SENSe:]DETector:BANDwidth Sets the AC bandwidth (AC filter). Parameter: (3 | 20 | 200) Example: SENS:DET:BAND 20 Sets the AC bandwidth to 20Hz. [SENSe:]DETector:BANDwidth? Returns the AC bandwidth.
GDM-8261A User Manual [SENSe:]CURRent:DETect? Returns the auto-detect status for the current functions. Return Parameter: 0|1 1=ON, 0=OFF [SENSe:]DIGital:SHIFt Sets the Digital Shift function on or off. Parameter: ON | OFF Example: SENS:DIG:SHIF ON Turn the digital shift function on. [SENSe:]DIGital:SHIFt? Returns the Digital Shift function status.
REMOTE CONTROL [SENSe:]VOLTage:DC:RANGe? Returns the DC Voltage measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]VOLTage:AC:RANGe Sets the AC Voltage measurement range. Parameter: (<NRf> | MIN | MAX) Example: SENS:VOLT:AC:RANG MIN Set the AC voltage range to lowest range allowed. [SENSe:]VOLTage:AC:RANGe? Returns the AC Voltage measurement range.
GDM-8261A User Manual [SENSe:]FRESistance:RANGe Sets the 4W resistance measurement range. Parameter: Range(<NRf> | MIN | MAX) Example: SENS:FRES:RANG 1000 Sets the 4W resistance range to 1kΩ. [SENSe:]FRESistance:RANGe? Returns the 4W resistance measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]FREQuency:VOLTage:RANGe Sets the frequency measurement range.
REMOTE CONTROL [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. Parameter: ON|OFF Example: SENS:CURR:DC:RANG:AUTO OFF Turns Auto-range off for DC current measurements. [SENSe:]CURRent:DC:RANGe:AUTO? Returns the DC current Auto-range settings. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]CURRent:AC:RANGe:AUTO Sets the AC Current Auto-range settings on/off.
GDM-8261A User Manual [SENSe:]FREQuency:VOLTage:RANGe:AUTO Sets the Frequency Auto-range settings on/off. Parameter: ON|OFF Example: SENS:FREQ:VOLT:RANG:AUTO ON Turns the Auto-range on for the frequency function. [SENSe:]FREQuency:VOLTage:RANGe:AUTO? Returns the frequency Auto-range setting. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]PERiod:VOLTage:RANGe:AUTO Sets the Period Auto-range settings on/off.
REMOTE CONTROL [SENSe:]CURRent:DC:RESolution? Returns the DC Current resolution. Parameter: [None] | [MIN | MAX] [SENSe:]CURRent:AC:RESolution Sets the AC Current measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution(<NRf> | MIN | MAX) Example: SENS:CURR:AC:RES 0.0001 Sets the AC Current resolution to 0.0001 [SENSe:]CURRent:AC:RESolution? Returns the AC Current resolution.
GDM-8261A User Manual [SENSe:]DIODe:RESolution Sets the Diode measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution(<NRf> | MIN | MAX) Example:SENS:DIOD:RES 0.1e-4 Sets the Diode resolution to 0.00001 [SENSe:]DIODe:RESolution? Returns the Diode measurement resolution. Parameter: [None] | [MIN | MAX] [SENSe:]TEMPerature:TCOuple:RESolution Sets the thermocouple (T-CUP) measurement resolution.
REMOTE CONTROL [SENSe:]VOLTage:DC:NPLCycles Sets the integration time for DC Voltage measurements in PLCs (power line cycles). Where one PLC is equal to 16.6 milliseconds. For any <NRf> parameter, the DMM will automatically set the PLC to the closest acceptable PLC value (0.025, 0.1, 0.25, 1, 2, 12). Parameter: NPLCycles(<NRf>...
GDM-8261A User Manual [SENSe:]FRESistance:NPLCycles Sets the integration time for 4W resistance measurements in PLCs (power line cycles). Where one PLC is equal to 16.6 milliseconds. For any <NRf> parameter, the DMM will automatically set the PLC to the closest acceptable PLC value (0.025, 0.1, 0.25, 1, 2, 12).
REMOTE CONTROL CALCulate:HOLD:REFerence? Returns the percentage threshold from the Hold function. CALCulate:REL:REFerence Sets the reference value for the relative function. Parameter: <NRf> | MIN | MAX Example: CALC:REL:REF MAX Sets the reference value to the maximum allowed. CALCulate:REL:REFerence? Returns the reference value from the relative function. CALCulate:LIMit:LOWer Sets the lower limit of the compare function.
GDM-8261A User Manual CALCulate:STORe:COUNt Set the number of measurement counts that are recorded with the Store measurement function. Parameter: <NR1> (2 ~ 9999) | MIN | MAX Example: CALC:STOR:COUN 1000 Sets the number of counts to be recorded as 1000.
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.
GDM-8261A User Manual VAL1? Returns the 1 display reading in the unit format specified in the Configuration menu (Return Format, page 136) or from the SYSTem:OUTPut:FORMat command (page 200). Example: SAMP:COUN 100 VAL1? >+0.333E-4,V DC >+0.389E-4,V DC > etc, for 100 counts.
REMOTE CONTROL TRIGger:AUTO? Returns the Trigger Auto mode. Return parameter: 0|1, 0=OFF, 1=ON SAMPle:COUNt Sets the number of samples. Parameter: <NR1>(1 ~ 9999) | MIN | MAX Example: SAMP:COUN 10 Sets the number of samples to 10. SAMPle:COUNt? Returns the number of samples. Parameter: None | MIN | MAX TRIGger:COUNt Sets the number of trigger counts.
GDM-8261A 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.
GDM-8261A User Manual SYSTem:SCPi:MODE Sets the SCPI mode. The SCPI mode is used to determine whether the *IDN? query returns the “Normal” or “Compatible” identification string . See the SYSTem:IDNStr command for details. Parameter: NOR | COMP (NOR=Normal, COMP= Compatible) Example: SYST:SCP:MODE NOR Sets the SCPI mode to normal.
REMOTE CONTROL 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. Example: STAT:PRES RS-232C Interface Commands SYSTem:LOCal...
Returns the SRER (Service Request Enable Register) contents. *SRE Sets SRER contents. Parameter: <NR1>(0~255) 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-8261A.
REMOTE CONTROL 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. Parameter: <NR1>(101~118) Example: ROUT:MULT:OPEN 105,110 Channels 105 to 110 are enabled.
GDM-8261A User Manual 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 Range(ON|OFF) Function: 1(VOLT), 2(VOLT:AC), 3(CURR [DCI]), 4(CURR:AC [ACI]), 7(RES), 8(FREQ), 9(TEMP:TCO:C), 13(CONT), 14(PER), 15(TEMP:TCO:F),...
REMOTE CONTROL 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: <Boolean>(0|1) (0=OFF, 1=ON) 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”...
GDM-8261A User Manual 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 For the following command sets, please refer to the status system diagram on page 217...
● I pressed the EXIT key but cannot get out of Scanner mode. ● The GDM-8261A performance does not match the specifications. I pressed the EXIT key but cannot get out of Scanner mode. Press the Exit key, followed by the ACV (Scan) or DCV (Step) key.
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GDM-8261A User Manual 2. SYST: DISP OFF 3. SYST: OUTP:FORM 0 4. TRIG:DEL 0 5. SENS:AVER:STAT OFF 6. SAMP:COUN 2400 7. VAL1 ? If there is still a problem, please contact your local dealer or GWInstek at marketing@goodwill.com.tw.
APPENDIX PPENDIX System Info Firmware Version ..........212 Fuse Replace AC Source Fuse ........213 Replacement Replace Input Current Fuse ........214 Menu Tree Menu Tree.............215 Status system Status system ............217 Specifications General ..............218 DC Characteristics ..........219 AC Characteristics ..........221 Frequency and Period Characteristics ....224 Temperature Characteristics .........225 Dimensions ............226 EC Declaration...
GDM-8261A User Manual Firmware Version Firmware version is available from the system menu. Background Shows the GDM-8261A firmware Firmware version number. version 1. Press the Shift key followed by MENU View firmware SHIFT / EXIT the 2nd (Menu) key. The system version menu appears.
APPENDIX Fuse Replacement Replace AC Source Fuse 1. Take off the power Steps cord and remove the fuse socket using a minus driver. 2. Replace the fuse in the holder. 3. Ensure the correct line voltage is lined up with the arrow on the fuse holder.
GDM-8261A 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...
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 HOLD TRIG...
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GDM-8261A User Manual Configuration Menu Tree SHIFT/ EXIT MENU MEAS SET ADC HZ/P SET LAN TX/TERM SCAN LEVEL 1 SYSTEM LEVEL 2 SIMPLE ADVAN MONITOR MIN CH MIN CH CH 01 MAX CH MAX CH TIMER TIMER CH 18 COUNT...
APPENDIX Status system The diagram below is a description of the status system For the following command sets, please refer to the diagram above. STAT: QUES: EVEN? STAT: QUES: ENAB STAT: QUES: ENAB? *ESR? *ESE *ESE? *STB? *SRE *SRE?
GDM-8261A User Manual 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. Make sure that the Sense LO terminal to COM port is ...
APPENDIX function. Without REL function, add 0.2 Ω additional error in 2-wire ohms function. [ 6 ] 0˚C~18˚C, 28˚C~55˚C [ 7 ] Accuracy specifications are for the voltage measured at the input terminals only. 1mA test current is typical. Variation in the current source will create some variation in the voltage drop across a diode junction.
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APPENDIX 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 – 300 kHz Bandwidth Medium 20 Hz –...
GDM-8261A User Manual [ 10 ] All speeds need Fixed range and Trigger Delay=0. Frequency and Period Characteristics [3] [7] 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...
APPENDIX [ 6 ] Need Fixed ACI/ACV range and Trigger Delay=0. Slow rate [ 7 ] To meet the specifications accuracy, setting is needed. Temperature Characteristics (Display in °C, °F, Exclusive of probe errors.) (Accuracy based on PT100): (100Ω platinum [PT100], D100, F100,PT385, PT3916, or user type) Temperature Coefficient Range Resolution...
(2) No. 69, Lu San Road, Suzhou City (Xin Qu), Jiangsu Sheng, China declare, that the below mentioned product Type of Product: Digital Multimeter Model Number: GDM-8261A are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (2004/108/EC) and Low Voltage Directive (2006/95/EC).
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GDM-8261A User Manual NDEX Crest factor ............. 31 Current AC bandwidth scanner configuration ......105 setting ............86 setting ............32 ADC speed Current auto-detect setting ............92 input port setting ........87 Analog filter setting ............82 Auto-gain setting ............90 setting ............
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INDEX Gateway ........... 149 MX+B ............68 Initial settings .......... 154 Percentage ..........70 IP 146 setting ............68 MAC address ........... 152 Standard deviation ........71 Reset ............144 Statisics ............. 71 Subnet ............148 Measurement keys Telnet ............153 overview .............
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GDM-8261A User Manual triggering ..........119 Temperature Scanner configuration record/log ....112 RTD setting ..........47 scanner configuration ......105 Serial number setting ..........43, 46 setting ............75 Thermocouple Service contact ..........210 junction setting ......... 45 Specification conditions ....... 209 setting ............
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