GW Instek GDM-904 Series User Manual
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GW Instek GDM-904 Series User Manual

GW Instek GDM-904 Series User Manual

Dual measurement multimeter
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Dual Measurement Multimeter
GDM-904X Series
USER MANUAL
REV. A
ISO-9001 CERTIFIED MANUFACTURER

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Summary of Contents for GW Instek GDM-904 Series

  • Page 1 Dual Measurement Multimeter GDM-904X Series USER MANUAL REV. A ISO-9001 CERTIFIED MANUFACTURER...
  • 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 Table of Contents SAFETY INSTRUCTIONS ..............5 Safety Symbols ..............5 Safety Guidelines ............... 6 GETTING STARTED ............... 9 Characteristics ..............10 Front Panel Overview ............12 Rear Panel Overview ............17 Status Bar ................19 Set Up ................22 BASIC MEASUREMENT ..............
  • Page 4 GDM-904X Series User Manual MENU SETTING ................90 Configure System ............... 91 SCREENSHOT & LOG ..............100 Capture ................101 Save Data Log ..............102 REMOTE CONTROL ..............106 Configure Interface ............107 Command Syntax ............... 114 Command Set ..............118 Status system ..............

  • Page 5: Safety Instructions

    SAFETY INSTRUCTIONS AFETY INSTRUCTIONS This chapter contains important safety instructions that you must follow when operating the GDM-9041/9042 and when keeping it in storage. Read the following before any operation to ensure your safety and to keep the GDM-9041/9042 in the best possible condition. Safety Symbols These safety symbols may appear in this manual or on the GDM-9041/9042.

  • Page 6: Safety Guidelines

    GDM-904X Series User Manual Safety Guidelines Make sure that the voltage input level does not exceed General Guideline • DC 1000 V/AC 750 V. Make sure the current input level does not exceed 12 A. • CAUTION Do not place any heavy object on the instrument. •...
  • Page 7 SAFETY INSTRUCTIONS Power Cord If the equipment is used in a manner not specified by the Requirement manufacturer, the protection provided by the equipment may be impaired. Do NOT replace the detachable MAINS supply cords by inadequately RATED cords. Suitable supply cord set for use with the equipment: ▪...
  • Page 8 GDM-904X Series User Manual (Note) EN 61010-1 specifies the pollution degrees and their requirements as follows. The GDM-9041/9042 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”. Pollution degree 1: No pollution or only dry, •...

  • Page 9: Getting Started

    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. INPUT...

  • Page 10: Characteristics

    GDM-904X Series User Manual Characteristics The GDM-9041/9042 is a portable, dual-display digital multimeter suitable for a wide range of applications, such as production testing, research, and field verification. The highest DCV accuracy: 0.02% Performance • The highest current:10A • The highest voltage: 1000V •...

  • Page 11: Accessories

    GETTING STARTED Accessories Standard Part number Description Accessories 82DM-90610MA1 Safety Instruction Sheet GTL-207A Test leads: 1x red, 1x black Optional Part number Description Accessories GTL-246 USB Cable, USB 2.0, A-B type, 1200 mm GTL-205A Temperature Probe Adapter with Thermal Coupling (K-type) GTL-248 GPIB Cable, approx.

  • Page 12: Front Panel Overview

    GDM-904X Series User Manual Front Panel Overview INPUT 9042 Digit Dual Mea surement Multimeter VΩ Ω TEMP CAT II 30 0V FREQ REL# Hold# TRIG# TRIG Hold Math Filter# Local Menu Filter Shift 500 Vpk 0.5 A POWER Auto Enter LOG/ LOG# Item Description...
  • Page 13 GETTING STARTED Turn On or Off the main Power Switch power. For the power up sequence, see page 23. The 4.3” TFT LCD shows measurement results and Main Display parameters. For display configurations, see page 95. There are 4 rows in total of both basic and advanced Measurement measurement keys deployed on the front panel.
  • Page 14 GDM-904X Series User Manual Single press to escape from current page ESC (Escape) Key to the previous page. Capture the current screenshot or saves Screenshot / Data the data log for reading. For details, refer Log Saving Key to page 100. Press the Auto key to activate auto-range mode when under measurement display.

  • Page 15: Measurement Keys (Basic)

    GETTING STARTED Measurement Keys (Basic) The upper 2 rows of measurement keys are used for Background basic measurements. Each key has a primary and secondary function individually. The secondary function is accessed in conjunction with the Shift key. The Shift key is used to select the Shift secondary functions assigned to each front panel key.

  • Page 16: Measurement Keys (Advanced)

    GDM-904X Series User Manual Measurement Keys (Advanced) The lower 2 rows of measurement keys are used for Background more advanced functions. Each key has a primary and secondary function. The secondary function is accessed in conjunction with the Shift key. Measures the Relative value (page 64).

  • Page 17: Rear Panel Overview

    GETTING STARTED Rear Panel Overview CURRENT FUSE AC SELECTOR T1. 0A GPIB 240V 220V 120V 100V (1000V) 50/60H z 30VA MAX. Disconnect power c ord and test leads before replac ing f use. For continued fire protection, use specified line fuse. SER.NO.
  • Page 18 GDM-904X Series User Manual Holds the current fuse: T 1.0 A, Current Fuse Box 1000 V, 6*30 mm For fuse replacement details, see page 150. Accepts a USB device cable for USB device port remote control; Type B, female connector. For remote control details, see page 108.

  • Page 19: Status Bar

    GETTING STARTED Status Bar Identify each icon within the top status bar. Background Status Bar Display Item Description Local/Remote control icon USB-CDC/USB-TMC/GPIB interface icon Error icon for commands from remote control Shift key identification icon The first and second function menu switch icon Auto Identification for input source measurement USB flash drive connection icon Beep/Key Sound setting icon...
  • Page 20 GDM-904X Series User Manual It indicates the unit is under local Local Control control mode. It indicates the unit is under remote Remote Control control. Refer to page 106 for details. It indicates USB - CDC interface is USB - CDC activated.
  • Page 21 GETTING STARTED It indicates the Save Reading mode is Flash Drive – ready for the connected flash drive. Refer Save Reading to page 102 for details of Save Reading. It indicates something error occurs and Flash Drive – thus flash drive fails to connect to unit. Failure It indicates sound of beep is enabled.

  • Page 22: Set Up

    GDM-904X Series User Manual Set Up Horizontal/Tilt/Vertical Applications Pull out the handle sideways and rotate it clockwise for the applications below. Tilt Horizontal Place the unit horizontally. Rotate the handle for tilt stand. Vertical Place the handle vertically for hand carry.

  • Page 23: Power Up

    GETTING STARTED Power Up 1. Before the power is turned on, AC SELECTOR Steps confirm the input power supply meets the following conditions: 240V 220V 120V 100V 100 V/120 V/220 V/240 V ± 10 %, 50/60 Hz 2. The fuse is a slow-blow fuse. T 0.16 A (220 V/240 V), T 0.315 A (100 V/120 V) Confirm that the fuse is of the...

  • Page 24: Basic Measurement

    GDM-904X Series User Manual ASIC MEASUREMENT Basic Measurement Overview ............ 26 Refresh Rate ..............26 Internal (Automatic) Triggering ........... 28 AC/DC Voltage Measurement ............. 29 Select Voltage Range ............30 General Voltage Setting ............31 Voltage Conversion Table ........... 32 Crest Factor Table ..............
  • Page 25 BASIC MEASUREMENT Thermocouple Sensor Type ..........50 Thermocouple Setting ............50 A.I. (Auto Identification) Measurement ........51...

  • Page 26: Basic Measurement Overview

    GDM-904X Series User Manual Basic Measurement Overview Basic measurement refers to the several types of measurements Background assigned to the upper 2 row keys on the front panel. AC Voltage Measurement type DC Voltage AC Current DC Current 2-wire Resistance Ω...
  • Page 27 BASIC MEASUREMENT Press the left or right Arrow keys to change the Selection refresh rate. Procedure Also, press the F2 (Speed) key to select a desired refresh rate. Press corresponding function key in accord with the desired option on display. The refresh rate will be shown at the upper right corner of the display.

  • Page 28: Internal (Automatic) Triggering

    GDM-904X Series User Manual Internal (Automatic) Triggering By default, the GDM-9041/9042 automatically triggers Overview measurement according to the set refresh rate. See the previous page for refresh rate setting details. The TRIG key, on the other hand, can be used to manually trigger once per click. Simply press the TRIG key to SIN trigger mode, SIN (Manual) which signifies manual triggering measurement.

  • Page 29: Ac/Dc Voltage Measurement

    BASIC MEASUREMENT AC/DC Voltage Measurement 0 to 750V Voltage type 0 to 1000V Press the ACV key or DCV key to Activate measure AC or DC voltage, ACV/DCV respectively. The mode will switch to ACV, DCV mode immediately. See ACV/DCV mode the figure below for example.

  • Page 30: Select Voltage Range

    GDM-904X Series User Manual Select Voltage Range To turn the automatic range selection Auto range On/Off, press the Auto key. Press the up or down arrow key to select Manual range the range. The Auto indicator turns to indicating Manual range selection. If the appropriate range is unknown, select the highest range.

  • Page 31: General Voltage Setting

    BASIC MEASUREMENT General Voltage Setting DCV/ACV: F2 (Speed) key to select refresh Press the F1 to F5 key to select the desired rate rate Specify the input impedance to the F3 (Input R) key Background test leads (Input R). This specifies to select input the measurement terminal input resistance...

  • Page 32: Voltage Conversion Table

    GDM-904X Series User Manual Voltage Conversion Table This table shows the relationship between AC and DC Background reading in various waveforms. Waveform Peak to Peak (True RMS) 2.828 1.000 0.000 Sine 1.414 0.435 0.900 Rectified Sine (full wave) 2.000 0.771 0.636 Rectified Sine (half wave)

  • Page 33: 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 34: Ac/Dc Current Measurement

    GDM-904X Series User Manual AC/DC Current Measurement The GDM-9041/9042 series DMMs have two input Background terminals for current measurement. A 0.5A terminal for current less than 0.5A and a 10A terminal for measurements up to 12A. The units can measure 0 to 10A for both AC and DC current. AC/DC 0.5A/10A Current type Press the Shift →...

  • Page 35: Select Current Range

    BASIC MEASUREMENT Connect the test lead between the Connect the test 10 A terminal and the COM lead and measure terminal or DC/AC 0.5 A terminal and the COM terminal, depending on the input current. For current ≤ 0.5 A use the 0.5 A terminal;...

  • Page 36: General Current Setting

    GDM-904X Series User Manual Selectable Current Range Resolution Full scale INJACK Ranges 500 µA 10 nA 510.00 µA 0.5 A 5 mA 100 nA 5.1000 mA 0.5 A 50 mA 1 µA 51.000 mA 0.5 A 500 mA 10 µA 510.00 mA 0.5 A 100 μA...

  • Page 37: 2W Resistance Measurement

    BASIC MEASUREMENT 2W Resistance Measurement Uses the standard Input HI-LO terminals. Measurement 2-wire OHM type Press the Ω2W key to activate 2W Activate 2W resistance measurement. Measurement The mode will switch to the selected resistance mode 2W resistance immediately. Press the Shift → Ω2W key on the front mode display panel as figure shown below.

  • Page 38: Select Resistance Range

    GDM-904X Series User Manual Select Resistance Range To turn the automatic range selection On/Off, Auto range press the Auto key. Press the up or down arrow key to select the Manual range range. The Auto indicator turns to indicating Manual range selection. If the appropriate range is unknown, select the highest range.

  • Page 39: Continuity Test

    BASIC MEASUREMENT Continuity Test The continuity test checks that the resistance in the DUT is Background low enough to be considered continuous (of a conductive nature). Activate continuity Press the key to activate continuity testing. test The mode will switch to continuity testing immediately. Continuity mode display appears Press...

  • Page 40: Set Continuity Threshold

    GDM-904X Series User Manual Press the F1 to F3 key to select the desired rate F2 (Speed) key to select the rate. Press the F2 to F4 key to select the volume level F3 (BeepVol) key or press the F1 key to set Beep volume off to select the Vol Set Continuity Threshold The continuity threshold defines the maximum resistance...

  • Page 41: Diode Measurement

    BASIC MEASUREMENT Diode Measurement The diode test checks the forward bias characteristics of a Background diode by running a constant forward bias current of approximately 1 mA through the DUT. Activate diode test Press the key to activate diode measurement. The screen will switch to Diode mode immediately as the Diode mode figure shown below.

  • Page 42: Frequency/Period Measurement

    GDM-904X Series User Manual Frequency/Period Measurement The GDM-9041/9042 can be used to measure the frequency or Description period of an input signal. Frequency 10 Hz to 1 MHz Range Period 1.0 μs to 100 ms • To measure Frequency, press the FREQ key Activate followed by clicking the F3 (Measure) key to enter frequency or...
  • Page 43 BASIC MEASUREMENT The mode will switch to the Frequency or Period mode Frequency mode display immediately. Press on the front panel followed by appears clicking F3 key to choose Frequency as shown below. Frequency Indicates Frequency measurement 100ms Indicates the active refresh rate Indicates Manual range selection Indicates the available range of Voltage 4.9990 Hz...

  • Page 44: Frequency/Period In-Depth Setting

    GDM-904X Series User Manual Frequency/Period In-Depth Setting The input voltage/current range for frequency/period Background measurements can be set to Auto range or to manual. By default, the voltage/current range is set to Auto for both the period and frequency. Press the Auto key. Auto will be displayed Auto range on the upper right corner.
  • Page 45 BASIC MEASUREMENT Press the up or down arrow key to select F1 (AC Range) key to desired range. The Auto indicator turns manually select range setting indicating Manual range selection. If the appropriate range is unknown, select the highest range. You can also press the F1 (AC Range) key to select a range for the measurement.

  • Page 46: Capacitance Measurement

    GDM-904X Series User Manual Capacitance Measurement The capacitance measurement function checks the Background capacitance of a component. Activate Press the Shift → to activate capacitance test capacitance measurement. The screen will switch to capacitance mode immediately. Capacitance mode display appears Press on the front panel as shown below.

  • Page 47: Cable Open Function

    BASIC MEASUREMENT Cable Open Function Cable open function will be activated when capacitance Background range is between 5 nF and 50 nF. It is required to proceed to Cable Open function when capacitance is between 5 nF and 50 nF in which test leads connected will result in measuring capacity in small scale.

  • Page 48: Select Capacitance Range

    GDM-904X Series User Manual Select Capacitance Range To turn the automatic range selection On/Off, Auto range press the Auto key. Press the up or down arrow key to select desired Manual range range. The Auto indicator turns to indicating Manual range selection. If the appropriate range is unknown, select the highest range.

  • Page 49: Temperature Measurement

    BASIC MEASUREMENT Temperature Measurement The GDM-9042 can measure temperature utilizing Background Thermocouple devices. To measure temperature, the GDM-9042 accepts a device input and calculates the temperature from the voltage fluctuation. Temperature measurement is only supported on the GDM-9042. Temperature Range Thermocouple -200 °C to +300 °C (vary by sensor types) Activate Press the Shift +...

  • Page 50: General Temperature Setting

    GDM-904X Series User Manual General Temperature Setting Press the F1 to F3 key to select the desired rate F2 (Speed) key to select the rate Press the F4 (Unit) key to enter the Temperature Unit F3 (Unit) key to menu followed by clicking the F1 – F2 key to choose select unit of desired temperature unit.

  • Page 51: A.i. (Auto Identification) Measurement

    BASIC MEASUREMENT A.I. (Auto Identification) Measurement The GDM-9041/9042 can identifying the connected Background sources and switchs to the corresponding measurements automatically, which allows user to operate the unit in a more friendly manner with ease. Diode Continuity Applicable measurement ● ●...

  • Page 52: Dual Measurement

    GDM-904X Series User Manual UAL MEASUREMENT Dual Measurement ..............53 Refresh Rate ..............56 Connect the Test Leads ............57 The error influence on Dual Measurement (V & I) ....59 The error of current shunt ..........60...

  • Page 53: Dual Measurement

    DUAL 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 54 GDM-904X Series User Manual Choose one of the basic measurement 1st Measurement functions from the table above to set the item setting measurement mode for the primary display. For example, press DCV to set the first display to DCV measurement. To set a measurement mode for the second display, press 2nd Measurement the F6 (2ND) key and the 2ND Function options appear...
  • Page 55 DUAL MEASUREMENT Toggle the active display between the 1ST 1. Select active and 2ND display by long pressing the display Shift key for 2 seconds: (Press & hold for 2 seconds Primary display: 1ST highlighted in orange outline. Secondary display: 2ND highlighted in orange outline.
  • Page 56 GDM-904X Series User Manual Refresh Rate Refresh rate defines how frequently the Background GDM-9041/9042 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 57: Connect The Test Leads

    DUAL MEASUREMENT Reading The reading indicator flashes according to the defined Indicator refresh rate setting of the active display. Connect the Test Leads When using the dual measurement function, the Connect the test connection method and number of test leads required leads and measure depends on the measurement combination.
  • Page 58 GDM-904X Series User Manual Voltage/Frequency/ Period and Current Measurement DC Current measurements will be displayed as a Note 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 59 DUAL MEASUREMENT The error influence on Dual Measurement (V & I) While dual measurement of voltage and current is being Background executed, the route from DMM internal circuit to the LO terminal circuit for measuring voltage is totally identical with that for measuring current, and thus the resistor within the route is commonly shared by the two measuring circuits.
  • Page 60 GDM-904X Series User Manual The error of current shunt The principle of current measuring is to obtain current Background via the voltage proportionated by the measured shunt resistor and the current under test. The circuit is basically designed by high impedance (0.01 Ω to 100 Ω approximately) and with shortcoming of voltage drop by shunt.
  • Page 61 DUAL MEASUREMENT Vs = Voltage source Example RLoad = Load under test Rint = Current terminal total impedance containing Rshunt + Fuse + Rline + Rline Rline When different current range for measurement is selected, Rshunt will vary accordingly. For example, Vs = 10 V, Rload = 10 Ω, Rint = total impedance flowing through current terminal 0.5 Ω...

  • Page 62: Advanced Measurement

    GDM-904X Series User Manual DVANCED MEASUREMENT Advanced Measurement Overview ..........63 Relative Value Measurement ............64 Hold Measurement ..............66 Trigger Setting ................68 Automatic/Single Triggering ..........68 Filter Setting ................69 Digital Filter Overview ............69 Digital Filter Setting ............71 Math Measurement ..............

  • Page 63: Advanced Measurement Overview

    ADVANCED MEASUREMENT Advanced Measurement Overview Advanced measurement mainly refers to the type of Background measurement which uses the result obtained by one of the basic measurements: ACV, DCV, ACI, DCI, 2W, Diode/Continuity, Frequency/Period, and Temperature. Advanced Basic Measurement Measurement AC/DCV AC/DCI Hz/P TEMP* ●...

  • Page 64: Relative Value Measurement

    GDM-904X Series User Manual Relative Value Measurement Applicable to 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 references. The reference value will be cleared upon exit. REL, basically, is to subtract a certain value in the following measurement.
  • Page 65 ADVANCED MEASUREMENT +049.99 Shows the delta between the current measurement data and the reference value To set the reference (REL) value manually, Manually set press the Shift key followed by the REL key. the reference value The setting appears. First use function keys to decide unit value. Then use the Left/Right arrow keys to move cursor and Up/Down arrow keys or press Number keys to enter the desired value.

  • Page 66: Hold Measurement

    GDM-904X Series 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 to activate Hold Activate Hold measurement.
  • Page 67 ADVANCED MEASUREMENT Press the F3 (Percent) key to show the setting F3 (Percent) menu of Hold Percent as the figure below. key to define threshold Press F1 to F4 key to select desired hold percent. For example, once the measured value is beyond 10%, which corresponds to the selected 10% option here, the latest hold value will be updated on the main reading.

  • Page 68: Trigger Setting

    GDM-904X Series User Manual Trigger Setting Automatic/Single Triggering Applicable to By default, the GDM-9041/9042 triggers according to the INT (Auto) refresh rate automatically. See the previous page for refresh triggering rate setting details. The figure below shows the screen of INT (default) (Auto) Trigger measurement.

  • Page 69: Filter Setting

    ADVANCED MEASUREMENT Filter Setting Digital Filter Overview Applicable to The GDM-9041/9042 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. The digital filter averages a specific number of input Filter type signal samples to generate one reading.

  • Page 70: Filter Count

    GDM-904X Series 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 to 160 Range Filter window defines the threshold for when the digital Filter window filter data is updated again.

  • Page 71: Digital Filter Setting

    ADVANCED MEASUREMENT Digital Filter Setting Press the Shift + Filter keys. The Filter setting Filter menu will be shown as the figure below. setting Press the F1 (FilterType) key to enter the Choose subsequent menu. Press the F1 or F2 keys to Filter Type select desired filter type.

  • Page 72: Math Measurement

    GDM-904X Series User Manual Math Measurement Applicable to Math measurement runs 6 types of mathematical Background operations, dBm, dB, Compare, MX+B, 1/X and Percent, based on the other measurement results. 10 x log10 (1000 x Vreading2 / Rref) Math Equation dBm –...
  • Page 73 ADVANCED MEASUREMENT Measure dBm/Watt Applicable to 10 x log (1000 x Vreading / Rref) Equation Watt Vreading /Rref Vreading Input Voltage, ACV or DCV Parameters Rref (REF Ω) Reference resistance simulating an output load Press the Shift key + Math key to Activate dBm activate Math setting menu as the following figure shown.
  • Page 74 GDM-904X Series User Manual Press the F2 (MaxMin) key to have the Maximum & maximum and minimum measured Minimum display values shown on the display. Max. and Min measured values Max/Min display On To change the reference resistance, Select reference press the F3 (REF Ω) key to enter the resistance (REF setting menu.
  • Page 75 ADVANCED MEASUREMENT Watt result appears The measured B (Watt) reading To cancel the dBm/Watt measurement, press Deactivate the F1 (Function) key followed by clicking F1 dBm/Watt (OFF) key to deactivate it or simply activate measurement another measurement. Measure dB Applicable to dBm –...

  • Page 76: Max & Min Display

    GDM-904X Series User Manual dB result appears Press the F2 (MaxMin) key to have Max & Min the maximum and minimum display measured values shown on the display. To change the reference resistance, Select reference press the F3 (REF Ω) key to enter the resistance (REF setting menu.
  • Page 77 ADVANCED MEASUREMENT Resistance List 1000 1200 8000 Reference method involves the ways to F4 (Ref Method) calculate dB value. When dBm option is to select dB selected, user can specify a definite dBm value reference method for dB calculation. If selecting Voltage option, system regards the defined voltage value as the Vreading parameter for dBm calculation, thus resulting in different dB...
  • Page 78 GDM-904X Series User Manual Press the F6 (Ref Value_Current) key to F6 (Ref Value) key to instantly make the current dBm value, which is set the dBm calculated by the current input voltage with reference the equation, as the Ref dBm (dBm reference). To cancel the dB measurement, press the F1 Deactivate dB (Function) key followed by clicking F1 (OFF)

  • Page 79: Compare Mode

    ADVANCED MEASUREMENT Compare Mode Applicable to The Compare mode checks and updates if measurement data Background stays between the specified upper (high) and lower (low) limit. Press the Shift + Math key to activate Math Activate setting menu as the following figure shown. Compare mode Further press the F1 (Function) key to enter...

  • Page 80: High Limit

    GDM-904X Series User Manual Press the F6 (High Limit) key to enter the F6 (High setting menu. Limit) to set high limit First use the functions keys to determine the unit, which varies by different measure modes. Then use function keys to decide unit value.
  • Page 81 ADVANCED MEASUREMENT Press the F4 (BeepVol) key to enter the beep F4 (BeepVol) volume setting. to select beep volume Select the intensity of beep volume via pressing F1 – F3 key for desired level as the figure shown below. When the measured result is within the range of high and low Compare limit, the display shows as the figure below with purely black mode result...

  • Page 82: Mx+B Measurement

    GDM-904X Series User Manual MX+B Measurement Applicable Press the Shift + Math key to activate Math Activate setting menu as the following figure shown. MX+B Further press the F1 (Function) key to enter the Math Function menu as the figure shown below.
  • Page 83 ADVANCED MEASUREMENT Press the F3 (M Value) key to enter the MX+B F3 (M M Value menu. First use function keys to Value) key decide unit value, which may vary by different to set the measurements. Then use the Left/Right arrow factor M keys to move cursor and Up/Down arrow keys or press Number keys to enter the desired...

  • Page 84: 1/X Measurement

    GDM-904X Series User Manual 1/X Measurement Applicable Press the Shift + Math key to activate Math Activate setting menu as the following figure shown. Further press the F1 (Function) key to enter the Math Function menu as the figure shown below. Press F6 (More 1/2) key to enter the next page followed by pressing the F1 (1/X) key.
  • Page 85 ADVANCED MEASUREMENT Press the F2 (MaxMin) key to have the Max & Min maximum and minimum measured values display shown on the display. To cancel the 1/X measurement, press the F1 Deactivate 1/X (Function) key followed by clicking the F1 measurement (OFF) key to deactivate it or simply activate another measurement.

  • Page 86: Measure Percent

    GDM-904X Series User Manual Measure Percent Applicable Press the Shift + Math key to activate Math Activate setting menu as the following figure shown. percent Further press the F1 (Function) key to enter the Math Function menu as the figure shown below.
  • Page 87 ADVANCED MEASUREMENT Press the F2 (MaxMin) key to have the Max & Min maximum and minimum measured values display shown on the display. Press the F3 (REF %) key to enter the Percent F3 (REF %) REF % menu. First use the functions keys to key to set determine the unit, which may vary by reference %...

  • Page 88: System & Firmware

    GDM-904X Series User Manual YSTEM & FIRMWARE View System Info ............... 89...

  • Page 89: View System Info

    SYSTEM & FIRMWARE View System Info View system information including Vendor, Model Name, Background Serial Number, Master Firmware and Slave Firmware. 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Cali&Info – SystemInfo field.
  • Page 90 GDM-904X Series User Manual ENU SETTING Configure System ............... 91 Beep Setting ..............91 Key Sound Setting .............. 92 Date Setting ............... 93 Time Setting ..............94 Brightness Setting .............. 95 Auto Dim Setting ..............96 Zero Fill Setting ..............97 Factory Setting ..............

  • Page 91: Menu Setting

    MENU SETTING Configure System Beep Setting Enable or Disable Beep Sound. Background 1. Press the Menu key, the System Step configuration menu appears. 2. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the ON option.

  • Page 92: Key Sound Setting

    GDM-904X Series User Manual Key Sound Setting Enable or Disable Key Sound. Background 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Key Sound field. 2. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the ON option.

  • Page 93: Date Setting

    MENU SETTING Date Setting Manually adjust date for system. Background 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Date/Time – Date field. 2. Use the Left/Right arrow keys to move the cursor followed by pressing Up/Down arrow keys or press Number keys to define...

  • Page 94: Time Setting

    GDM-904X Series User Manual Time Setting Manually adjust time for system. Background 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Date/Time – Time field. 2. Use the Left/Right arrow keys to move the cursor followed by pressing Up/Down arrow keys or press Number keys to define...

  • Page 95: Brightness Setting

    MENU SETTING Brightness Setting Backlight brightness adjustment Background 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Backlight – Brightness field. 2. Use the Left/Right arrow keys to move the cursor followed by pressing Up/Down arrow keys or press Number keys to define digit.

  • Page 96: Auto Dim Setting

    GDM-904X Series User Manual Auto Dim Setting Set a duration before activation of automatic dim out for Background screen display. 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Backlight – Auto Dim field.

  • Page 97: Zero Fill Setting

    MENU SETTING Zero Fill Setting Automatically omit the redundant zero “0” values Background displayed, which makes measured reading more concise. 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Display – Zero Fill field.

  • Page 98: Factory Setting

    GDM-904X Series User Manual Factory Setting The Factory function restores the unit back to the factory Background default settings. 1. Press the Menu key, the System Step configuration menu appears. And press the NEXT key repeatedly to move to the Parameter - Factory field.

  • Page 99: Calibration Setting

    MENU SETTING Calibration Setting With granted password, the calibration procedure can be Background only executed by the certified technician in accordance with the standard instruments. Refer to the manufacturer or qualified personnel of authorized dealer for details. View System Info View system information including Vendor, Model Name, Background Serial Number, Master Firmware and Slave Firmware.

  • Page 100: Screenshot & Log

    GDM-904X Series User Manual CREENSHOT & LOG Capture ................... 101 Save Data Log ................102...

  • Page 101: Capture

    SCREENSHOT & LOG Capture Configure the mode of screenshot capturing. Background Supported USB Sticks: USB Disk Type: Flash Disk Only FAT Format: Fat16 or Fat32(Recommended) Max memory size: 128 GB Flash disks which need to use card adaptors are Note not recommended to be used in this application.

  • Page 102: Save Data Log

    GDM-904X Series User Manual Save Data Log Configure the modes of data log saving. Background 1. Press the Shift key followed by the Step of LOG/LOG# key and the Simple Mode following menu appears. 2. Press the F1 (Log Mode) key followed by clicking the F2 (Simple) key to enable the Simple mode for data log saving.
  • Page 103 SCREENSHOT & LOG 1. Press the Shift key followed by the Step of LOG/LOG# key and the Advance Mode following menu appears. 2. Press the F1 (Log Mode) key followed by clicking the F3 (Advance) key to enable the Advance mode for data log saving. Users can make detailed settings in this mode.
  • Page 104 GDM-904X Series User Manual 4. Press the F3 (ExistFile) key followed by selecting either Newfile or Continue option for the existed log file in USB disk. Newfile Exist ▪ By default, a new file is created each time the File log saving function is applied.
  • Page 105 SCREENSHOT & LOG 6. Press the F5 (LogCount) key followed by manually input defined value in the field of Log Save Count for data log saving. The Count function sets how many readings to perform each time the log saving function is Count applied.

  • Page 106: Remote Control

    GDM-904X Series User Manual EMOTE CONTROL CURRENT FUSE AC SELECTOR T1. 0A GPIB (1000V) 240V 220V 120V 100V 50/60H z 30VA MAX. D isconnect power c ord and test leads before replac ing f use. For continued fire protection, use specified line fuse.

  • Page 107: Configure Interface

    Background Identity of SCPI ID is set to 834X, it indicates the pattern of commands is compatible with the previous GDM-834X models also manufactured by GW INSTEK. 1. Press the Menu key, and then the Step Page Down key repeatedly until the Interface configuration menu appears.

  • Page 108: Configure Usb Interface

    GDM-904X Series User Manual 3. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the desired SCPI ID Identity option. 4. Press the F5 (Enter) key or physical Enter key to confirm the desired SCPI ID Identity option Configure USB Interface Front panel, Type A, host...
  • Page 109 REMOTE CONTROL 2. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the USB option. 3. Press the F5 (Enter) key or physical Enter key to select the USB option. 4.
  • Page 110 GDM-904X Series User Manual 5. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the desired USB Protocol option. 6. Press the F5 (Enter) key or physical Enter key to confirm the USB Protocol option.

  • Page 111: Set The Usb Protocol

    REMOTE CONTROL Set the USB Protocol The USB device port on the rear panel is used for remote Description control. The USB port can be configured as either a TMC or CDC interface. Before the GDM-9041/9042 can be used for remote control utilizing the CDC or TMC USB class, install the appropriate CDC or TMC USB driver included on the User Manual CD.

  • Page 112: Configure Gpib Interface

    GDM-904X Series User Manual Configure GPIB Interface 24 Pin female GPIB port GPIB Configuration Connector 0-30(default 15) Address 1. Press the Menu key, and then Step the Page Down key repeatedly until the Interface configuration menu appears. 2. Press the F5 (Enter) key or physical Enter key followed by pressing up and down arrow keys to land on the GPIB option.
  • Page 113 REMOTE CONTROL 5. Use the Left/Right arrow keys to move the cursor followed by pressing Up/Down arrow keys or press Number keys to define GPIB Address. 6. Press the F5 (Enter) key or physical Enter key to confirm the input GPIB Address.

  • Page 114: Command Syntax

    GDM-904X Series User Manual 7. Connect the GPIB cable to the rear panel optional communication port after the GPIB card has been installed. 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 Data I/O 3 15 Data I/O 7...
  • Page 115 REMOTE CONTROL There are a number of different instrument commands and Command queries. A command sends instructions or data to the unit and Types a query receives data or status information from the unit. Command types Simple A single command with/without a parameter Example CONFigure:VOLTage:DC Query...
  • Page 116 GDM-904X Series User Manual 1. Command header 3. Parameter 1 2. Space Type Description Example Common Input <Boolean> boolean logic 0, 1 Parameters <NR1> integers 0, 1, 2, 3 <NR2> decimal numbers 0.1, 3.14, 8.5 <NR3> floating point with exponent 4.5e-1, 8.25e+1 <NRf>...
  • Page 117 REMOTE CONTROL Example conf:volt:dc 5 This will set the measurement item to DC Voltage and the range to 5V. There is no 1V range so the DMM selects the next available range, 5V. Remote Marks the end of a command line. The Message following messages are in accordance with Terminator...

  • Page 118: Command Set

    GDM-904X Series User Manual Command Set Configure Commands (1 CONFigure:VOLTage:DC ................124 CONFigure:VOLTage:AC ................124 CONFigure:CURRent:DC ................124 CONFigure:CURRent:AC ................124 CONFigure:RESistance ................124 CONFigure:FREQuency ................124 CONFigure:PERiod ..................124 CONFigure:CONTinuity ................125 CONFigure:DIODe ..................125 CONFigure:TEMPerature:TCOuple ............125 CONFigure:CAPacitance ................125 CONFigure:FUNCtion?................

  • Page 119: Measure Commands

    REMOTE CONTROL Measure Commands MEASure:VOLTage:DC? ................128 MEASure:VOLTage:AC? ................128 MEASure:CURRent:DC? ................128 MEASure:CURRent:AC?................128 MEASure:RESistance? ................129 MEASure:FREQuency? ................129 MEASure:PERiod? ..................129 MEASure:CONTinuity? ................129 MEASure:DIODe? ..................129 MEASure:TEMPerature:TCOuple? ............129 MEASure:CAPacitance? ................129 MEASure2:VOLTage:DC? ................130 MEASure2:VOLTage:AC? ................130 MEASure2:CURRent:DC? ................

  • Page 120: Calculate Commands

    GDM-904X Series User Manual [SENSe:]FUNCtion[X] ................. 132 [SENSe:]FUNCtion[X]? ................132 [SENSe:]DATA?................... 132 [SENSe:]CAPacitance:CABLe:CALibration ..........133 [SENSe:]VOLTage:DC:IMPedance:AUTO ............ 133 [SENSe:]VOLTage:DC:IMPedance:AUTO? ..........133 [SENSe:]FILTer:COUNt ................133 [SENSe:]FILTer:COUNt? ................133 [SENSe:]FILTer:STATe ................. 133 [SENSe:]FILTer:STATe?................133 [SENSe:]FILTer:TCONtrol ................133 [SENSe:]FILTer:TCONtrol? ................133 [SENSe:]FILTer:WINDow ................134 [SENSe:]FILTer:WINDow? ................

  • Page 121: Trigger Commands

    REMOTE CONTROL CALCulate:DBM:REFerence? ..............137 CALCulate:MATH:MMFactor ..............137 CALCulate:MATH:MMFactor? ..............137 CALCulate:MATH:MBFactor ..............137 CALCulate:MATH:MBFactor? ..............137 CALCulate:MATH:PERCent ................ 137 CALCulate:MATH:PERCent? ..............137 Trigger Commands READ? ....................... 138 VAL1? ......................138 VAL2? ......................138 TRIGger:SOURce ..................138 TRIGger:SOURce? ..................138 TRIGger:AUTO ...................

  • Page 122: Status Commands

    GDM-904X Series User Manual SYSTem:BEEPer:COMPare:VOLume ............141 SYSTem:BEEPer:COMPare:VOLume? ............141 SYSTem:BEEPer:CONTinuity:VOLume ............141 SYSTem:BEEPer:CONTinuity:VOLume? ............. 141 SYSTem:BEEPer:HOLD:VOLume ..............141 SYSTem:BEEPer:HOLD:VOLume? ............... 142 SYSTem:CLICk:STATe .................. 142 SYSTem:CLICk:STATe? ................142 SYSTem:DATE ..................... 142 SYSTem:DATE? ................... 142 SYSTem:DISPlay ..................142 SYSTem:DISPlay? ..................142 SYSTem:ERRor? ..................

  • Page 123: Common Command

    REMOTE CONTROL Common Command *CLS ......................145 *ESE? ......................145 *ESE ......................145 *ESR? ......................145 *IDN? ......................145 *OPC? ....................... 145 *OPC ......................145 *PSC? ......................145 *PSC ......................145 *RST ......................145 *SRE? ......................146 *SRE ......................146 *STB? ......................

  • Page 124: Configure Commands

    GDM-904X Series User Manual CONFigure Commands (1 CONFigure:VOLTage:DC Sets measurement to DC Voltage on the display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF:VOLT:DC 5 Sets the voltage range to 5 volts. CONFigure:VOLTage:AC Sets measurement to AC Voltage on the display and specifies the range.

  • Page 125: Configure:continuity

    REMOTE CONTROL CONFigure:CONTinuity Sets measurement to Continuity on the display. Parameter: None CONFigure:DIODe Sets measurement to Diode on the display. Parameter: None CONFigure:TEMPerature:TCOuple Sets measurement to Temperature thermocouple (T-CUP) on the display. Parameter: [None] | [Type(J | K | T)] Example: CONF:TEMP:TCO J Sets the measurement mode to TCO with a type J sensor.

  • Page 126: Configure2 Command

    GDM-904X Series User Manual CONFigure2 Command (2 CONFigure2:VOLTage:DC Sets measurement to DC Voltage on the display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF2:VOLT:DC 5 Sets the voltage range to 5 volts. CONFigure2:VOLTage:AC Sets measurement to AC Voltage on the display and specifies the range.

  • Page 127: Configure2:Off

    REMOTE CONTROL CONFigure2:OFF Turns the 2 display function off. Parameter: None. CONFigure2:FUNCtion? Returns the current function on the display. Return parameter: VOLT, VOLT:AC, CURR, CURR:AC, RES, FREQ, PER, NON CONFigure2:RANGe? Returns the range of the current function on the display. Return parameter: DCV: 0.5(500mV), 5(5V), 50(50V), 500(500V), 1000(1000V) ACV: 0.5(500mV), 5(5V), 50(50V), 500(500V), 750(750V)

  • Page 128: Measure Commands

    GDM-904X Series User Manual Measure Commands MEASure:VOLTage:DC? Returns the DC voltage measurement on the display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS:VOLT:DC? > +0.4880E-04 Returns the DC voltage measurement as 0.0488 mV. MEASure:VOLTage:AC? Returns the AC voltage measurement on the display.

  • Page 129: Measure:resistance

    REMOTE CONTROL MEASure:RESistance? Returns the 2W resistance measurement on the display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS:RES? > +1.1937E+03 Returns the 2W measurement as 1.1937 kΩ. MEASure:FREQuency? Returns the frequency measurement on the display. Parameter: [None] | [Range(<NRf>...

  • Page 130: Measure2:Voltage:dc

    GDM-904X Series User Manual MEASure2:VOLTage:DC? Returns the DC voltage measurement on the display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS2:VOLT:DC? > +0.4880E-04 Returns the DC voltage measurement as 0.0488 mV. MEASure2:VOLTage:AC? Returns the AC voltage measurement on the display.

  • Page 131: Sense Commands

    REMOTE CONTROL SENSe Commands [SENSe:]TEMPerature:TCOuple:TYPE Sets thermocouple type. Parameter: Type(J | K | T) Example: SENS:TEMP:TCO:TYPE J Sets the thermocouple to type J. [SENSe:]TEMPerature:TCOuple:TYPE? Returns the thermocouple type. Return parameter: J, K, T [SENSe:]TEMPerature:RJUNction:SIMulated Set temperature simulation value. Parameter: <NRf>(0.00 to 50.00) Example: SENS:TEMP:RJUN:SIM 25.00 Sets the thermocouple junction temperature to 25˚C.

  • Page 132: [Sense:]Period:inputjack

    GDM-904X Series User Manual [SENSe:]PERiod:INPutjack? Returns the assigned input terminal used for the period function. Return Parameter: VOLT, 500mA, 10A [SENSe:]CONTinuity:THReshold Sets the continuity threshold in ohms. Parameter: <NR1> (0 to 1000) Example: SENS:CONT:THR 500 Sets the continuity threshold to 500Ω [SENSe:]CONTinuity:THReshold? Returns the continuity threshold.

  • Page 133: [Sense:]Capacitance:cable:calibration

    REMOTE CONTROL [SENSe:]CAPacitance:CABLe:CALibration It is used like Relative function before capacitance measurement, (only be used at range 5nF,50nF). Parameter: [None] Example: CONF:CAP 5e-9 SENS:CAP:CABL:CAL Makes test lead to zero before capacitance measurement. [SENSe:]VOLTage:DC:IMPedance:AUTO Sets the Automatic input impedance for DC Voltage measurement. Parameter: 0 | 1 | ON(10G) | OFF(10M) Example: SENS:VOLT:DC:IMP:AUTO ON Turns the Automatic input impedance on.

  • Page 134: [Sense:]Filter:window

    GDM-904X Series User Manual [SENSe:]FILTer:WINDow Selects a digital filter window. Parameters: 0.01 | 0.1 | 1 | 10 | NONE Example: SENS:FILT:WIND 0.1 Sets digital filter window to 0.1% [SENSe:]FILTer:WINDow? Returns the digital filter window value. Return parameter: 0.01 | 0.1 | 1 | 10 | NONE...

  • Page 135: Calculate Commands

    REMOTE CONTROL CALCulate Commands CALCulate:FUNCtion Sets the Advanced function. Parameter: OFF | MIN | MAX | HOLD | REL | COMP | DB | DBM | MXB | INV | REF Example: CALC:FUNC REL Sets the Advanced function to REL (relative) CALCulate:FUNCtion? Returns the current Advanced function.

  • Page 136: Calculate:limit:lower

    GDM-904X Series User Manual CALCulate:LIMit:LOWer Sets the lower limit of the compare function. Para meter: <NRf> | MIN | MAX Example: CALC:LIM:LOW 1.0 Sets the lower limit to 1.0 CALCulate:LIMit:LOWer? Returns the lower limit of the compare function. CALCulate:LIMit:UPPer Sets the upper limit of the compare function. Parameter: <NRf>...

  • Page 137: Calculate:dbm:reference

    REMOTE CONTROL CALCulate:DBM:REFerence Sets the resistance value for the dBm function. Parameter: <NR1> (2, 4, 8, 16, 50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 800, 900, 1000, 1200, 8000) | MIN | MAX | DEF Example: CALC:DBM:REF MAX Sets the resistance value for dBm measurements to the maximum allowed.

  • Page 138: Trigger Commands

    GDM-904X Series User Manual TRIGger Commands READ? Returns 1 and 2 display value. VAL1? Returns the 1 display reading Example: SAMP:COUN 100 VAL1? >+0.3331E-04, >+0.3892E-04, > etc, for 100 counts. Queries 100 counts of stored samples from the 1 display. VAL2? Returns the 2 display reading.

  • Page 139: Sample:count

    REMOTE CONTROL SAMPle:COUNt? Returns the number of samples. TRIGger:COUNt Sets the number of trigger counts. Parameter: <NR1>(1 to 9999) | MIN | MAX Example: TRIG:COUN 10 Sets the number of trigger counts to 10. TRIGger:COUNt? Returns the number of trigger counts.

  • Page 140: Display Commands

    GDM-904X Series User Manual DISPlay Commands DISPlay[:STATe] Sets TFT LCD display screen on/off. Parameter: 0 | 1 | ON | OFF Example: DISP OFF Turns the TFT LCD display screen OFF. DISPlay[:STATe]? Returns the TFT LCD display screen state. Return parameter: 0 | 1, 1=ON, 0=OFF DISPlay:TEXT:CLEar Clears the text message from the display.

  • Page 141: System:beeper:state

    REMOTE CONTROL SYSTem Related Commands SYSTem:BEEPer:STATe Turns the buzzer on/off. Parameter: 0 | 1 | ON | OFF Example: SYST:BEEP:STAT 0 Turns the buzzer off. SYSTem:BEEPer:STATe? Returns the buzzer state. Return parameter: 0|1, 1=ON, 0=OFF SYSTem:BEEPer:ERRor Sets the beeper to sound on an SCPI error. Parameter: 0 | 1 | ON | OFF Example: SYST:BEEP:ERR ON Allows the beeper to sound when an SCPI error occurs.

  • Page 142: System:beeper:hold:volume

    GDM-904X Series User Manual SYSTem:BEEPer:HOLD:VOLume? Returns the beeper volume of Hold function. Return parameter: OFF | SMALL | MEDIUM | LARGE SYSTem:CLICk:STATe Turns the key sound of front panel on/off. Parameter: 0 | 1 | ON | OFF Example: SYST:CLIC:STAT 0 Turns key sound off.

  • Page 143: System:serial

    REMOTE CONTROL SYSTem:SERial? Returns the serial number (nine characters/numbers) SYSTem:TIME Sets the time for the instrument's real-time clock. Parameter: <NR1> (hour, minute, second) Example: SYST:TIME 16,20,30 Sets the time to 16:20:30 hour: 0 to 23 minute: 0 to 59 second: 0 to 59 SYSTem:TIME? Returns system time.

  • Page 144: Status:questionable:enable

    GDM-904X Series 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. Example: STAT:PRES Interface Commands SYSTem:LOCal...

  • Page 145: Ieee 488.2 Common Commands

    REMOTE CONTROL IEEE 488.2 Common Commands *CLS Clears the Event Status register (Output Queue, Operation Event Status, Questionable Event Status, Standard Event Status) *ESE? Returns the ESER (Event Status Enable Register) contents. Example: *ESE? >130 Returns 130. ESER=10000010 *ESE Sets the ESER contents. Parameter: <NR1>...
  • Page 146 GDM-904X Series User Manual *SRE? Returns the SRER (Service Request Enable Register) contents. *SRE Sets SRER contents. Parameter: <NR1>(0 to 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 DMM.

  • Page 147: Status System

    REMOTE CONTROL 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?

  • Page 148: Appendix

    GDM-904X Series User Manual PPENDIX Fuse Replacement..............149 Replace AC Source Fuse ............149 Replace 0.5A Input Current Fuse ......... 150 Replace Internal 10A Input Current Fuse ......151 Battery Replacement ............... 153 Factory Default Parameters ............155 Specifications ................158 General Specifications ............

  • Page 149: Fuse Replacement

    Fuse Replacement Fuse Replacement Replace AC Source Fuse Remove the power cord followed by taking out the fuse box Steps via using a small screw driver. The AC source fuse is stored within the housing. 100/120 VAC: T 0.315 A Rating •...

  • Page 150: Replace 0.5A Input Current Fuse

    GDM-904X Series User Manual Replace 0.5A Input Current Fuse To make sure if 0.5 A input current needs to be replaced, Preparation press the button to set GDM-9041/9042 in Continuity mode and short circuit the HI input terminal with the 0.5 A input current terminal.

  • Page 151: Replace Internal 10A Input Current Fuse

    Fuse Replacement 4. The fuse holder comes out. Replace the fuse inserted at the end of the holder followed by rotating the fuser holder clockwise to fasten it firmly. T1.0A, 1000V , 6*30mm Rating Replace Internal 10A Input Current Fuse To make sure if 10A input current needs to Replace internal Preparation...
  • Page 152 GDM-904X Series User Manual Internal 10A input current fuse Pull the fuse out from the fuse holder with a flat-blade screwdriver. Be cautious Not to damage the printed circuit board (PCB). 5. Disassemble the fuse. 6. Place the new fuse into the fuse holder. Gently push the fuse downwards to make it firmly fixed within the fuse holder.

  • Page 153: Battery Replacement

    Battery Replacement Battery Replacement This chapter describes the procedure of battery Beforehand replacement in the front panel. Before start, it is required to let a certified and trained technician properly aware of potential risks to disassemble instrument case. Unplug power cord and disconnect external circuit from the instrument before opening the case.
  • Page 154 GDM-904X Series User Manual 4. Gently remove the metal guard plate on top of the battery followed by pinching the battery out off the compartment with 2 fingers.. 5. Remove the battery and dispose or recycle it in accord with the applicable regulations. 6.

  • Page 155: Factory Default Parameters

    Factory Default Parameters Factory Default Parameters Measurement Factory Default Item List Parameter Parameter 1ST Function 1ST Range Auto Range 1ST Speed 2ND Function Filter Filter Type Move Filter Count Filter Window 0.10% Input Impedance 10M(fixed for DCV) Freq GateTime Freq InJack Voltage Continuity Threshold 10Ω...
  • Page 156 GDM-904X Series User Manual Math Factory Default Item List Parameter Parameter Math Function Function Beep Volume Small Hold Threshold 0.10% Function Reference Method Reference Resistance 600Ω Reference Resistance 600Ω Beep Mode Beep Volume Medium Compare Low Limit High Limit M Value MX+B B Value Trigger...
  • Page 157 Factory Default Parameters Menu Factory Default Item List Parameter Parameter Beep Key Sound Brightness System Auto Dim Zero Fill Factory Interface USB Protocol USBCDC Interface GPIB Address Identity Normal Only utilized parameters are listed here due to over-amount parameters. The rest of the parameters unlisted, however, can be saved and loaded as well.

  • Page 158: Specifications

    GDM-904X Series User Manual Specifications The specifications apply when the DMM is warmed up for at least 30 minutes and operates in slow rate. Below are the basic conditions required to operate the DMM within specifications: Calibration: Yearly • Operating Temperature Specification: 18 to 28˚C (64.4 to 82.4˚F) •...

  • Page 159: Dc Voltage

    Specifications DC Voltage Accuracy Range Resolution Full Scale (1 year 23˚C ±5˚C) Input Resistance 500 mV 10 μV 510.00 10 MΩ or >10 GΩ 100 μV 5.1000 10 MΩ or >10 GΩ 50 V 1 mV 51.000 0.02% +4 11.1 MΩ 500 V 10 mV 510.00...

  • Page 160: Ac Voltage, Acv+Dcv[3] (Ac Coupled)

    GDM-904X Series User Manual AC Voltage, ACV+DCV (AC Coupled) Accuracy (1 year 23˚C ±5˚C) [1] Range Resolution Full Scale 30 to 50 Hz 50 to 10 kHz 10 K to 30 kHz 30 K to 100 kHz 500 mV 10 μV 510.00 1.00% +40 0.50%+40...

  • Page 161: Resistance

    Specifications Resistance Accuracy Resistance Resolution Full Scale Test Current (1 year 23 ˚C ±5 ˚C)[2] 500.00 Ω 10 mΩ 510.00 1 mA 0.1% +5 [1] 5 kΩ 100 mΩ 5.1000 1 mA 0.1% +3 [1] 50 kΩ 1 Ω 51.000 100 μA 0.1% +3 500 kΩ...

  • Page 162: Capacitance

    GDM-904X Series User Manual Capacitance Accuracy Range Resolution Full Scale Test Current (1 year 23 ˚C ±5 ˚C) [1] 5 nF: 0.5 to 1 nF [2] 2.0% +20 0.001 nF 5.100 10 μA 5 nF: 1 to 5 nF [2] 2.0% +10 50 nF: 5 to 10 nF [2] 2.0% +30...

  • Page 163: Temperature Specifications

    Specifications 50 mA 2.5 mA 500 mA 25 mA 0.25 A (<2 kHz) 10 A 2.5 A (<2 kHz) Temperature Specifications Sensor Type Measurement Range Resolution Accuracy (1 year 23 ˚C ±5 ˚C) Thermocouple -200 to +300 °C 0.1 °C 2 °C * Note: The temperature specifications do not include sensor error.

  • Page 164: Dimensions

    GDM-904X Series User Manual Dimensions All dimensions are shown in millimeters.

  • Page 165: Declaration Of Conformity

    INDEX Declaration of Conformity GOOD WILL INSTRUMENT CO., LTD. declare that the CE marking mentioned product satisfies all the technical relations application to the product within the scope of council: Directive: EMC; LVD; WEEE; RoHS The product is in conformity with the following standards or other normative documents: ◎...
  • Page 166 GDM-904X Series User Manual NDEX Accessories ............11 storage ............8 Command IEE488.2 commands ....145 Frequency Command set setting ............42 CALCulate commands ....... 135 Front panel CONFigure commands ......125 overview ..........13, 20 CONFigure2 commands ......127 fuse Measure commands .........
  • Page 167 INDEX Safety instruction Thermocouple fuse ............... 7 junction setting .......... 51 symbol ............5 setting ............50 Specifications ..........158 Triggering ............28 Dimensions ..........164 Voltage Status system ..........147 setting ............29 Table of contents ........... 3 Temperature setting ............

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