GW Instek GDM-8351 User Manual
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GW Instek GDM-8351 User Manual

Dual measurement multimeter
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Dual Measurement Multimeter
GDM-8351
USER MANUAL
GW INSTEK PART NO. 82DM-83510E01
ISO-9001 CERTIFIED MANUFACTURER

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Summary of Contents for GW Instek GDM-8351

  • Page 1 Dual Measurement Multimeter GDM-8351 USER MANUAL GW INSTEK PART NO. 82DM-83510E01 ISO-9001 CERTIFIED MANUFACTURER...
  • Page 2 This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.

  • Page 3: Table Of Contents

    Table of Contents Table of Contents SAFETY INSTRUCTIONS ........... 5 GETTING STARTED ............10 Characteristics .......... 11 Appearance ..........13 Set Up ............23 OPERATION ..............28 Basic Measurement Overview ....30 AC/DC Voltage Measurement ....32 AC/DC Current Measurement ....37 Resistance Measurement ......
  • Page 4 GDM-8351 User Manual Frequency/Period Input Jack Settings ..80 Digital Filter ..........81 Restore Factory Default Settings ....85 Trigger ............86 DIGITAL I/O ..............88 Digital I/O Overview ......... 89 REMOTE CONTROL ............93 Configure Remote Control Interface ..94 Return to Local Control ......

  • Page 5: Safety Instructions

    SAFETY INSTRUCTIONS AFETY INSTRUCTIONS This chapter contains important safety instructions that you must follow during operation and storage. Read the following before any operation to ensure your safety and to keep the instrument in the best possible condition. Safety Symbols These safety symbols may appear in this manual or on the instrument.

  • Page 6: Safety Guidelines

     mains power cord from the socket. (Note) EN 61010-1:2010 specifies the measurement categories and their requirements as follows. The GDM-8351 falls under category II 600V.  Measurement category IV is for measurement performed at the source of low-voltage installation.
  • Page 7 SAFETY INSTRUCTIONS AC Input voltage: 100/120/220/240 V AC Power Supply  50/60Hz  WARNING The power supply voltage should not fluctuate  more than 10%. Connect the protective grounding conductor of  the AC power cord to an earth ground, to avoid electrical shock.
  • Page 8 GDM-8351 User Manual (Note) EN 61010-1:2010 specifies the pollution degrees and their requirements as follows. The GDM-8351 falls under degree 2.  Pollution refers to “addition of foreign matter, solid, liquid, or gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity”.
  • Page 9 SAFETY INSTRUCTIONS Power cord for the United Kingdom When using the unit in the United Kingdom, make sure the power cord meets the following safety instructions. NOTE: This lead/appliance must only be wired by competent persons WARNING: THIS APPLIANCE MUST BE EARTHED IMPORTANT: The wires in this lead are coloured in accordance with the following code: Green/ Yellow:...
  • Page 10 GDM-8351 User Manual ETTING STARTED This chapter describes the GDM-8351 multimeter in a nutshell, including accessories, package contents, its main features and front / rear panel introduction. Characteristics ..............11 Accessories ..............12 Appearance ..............13 GDM-8351 Front Panel ..........13 Display Overview ............

  • Page 11: Getting Started

    GETTING STARTED Characteristics The GDM-8351 is a portable, dual-display digital multimeter suitable for a wide range of applications, such as production testing, research, and field verification. DCV accuracy: 0.012% Performance  High current range: 10A  High Voltage range: 1000V ...

  • Page 12: Accessories

    GDM-8351 User Manual Accessories Standard Part number Description Accessories 82DM-83510E x1 CD-ROM (User Manual, Software, Driver) 82DM-83511M x1 Safety Instruction Sheet GTL-207 Test leads Optional Part number Description Accessories GTL-246 USB Cable, USB 2.0, A-B type, 1200mm GTL-205 Temperature Probe Adapter with...

  • Page 13: Appearance

    GETTING STARTED Appearance GDM-8351 Front Panel Power Switch Sense LO Terminal Sense HI Terminal GDM-8351 SENSE INPUT Terminal 120000 Counts Dual Measurement Multimeter W 4W Main Display 1000V 200Vpk 750V RANGE POWER DC + AC Terminal 500Vpk LOCAL TEMP 2W/4W...
  • Page 14 SENSE INPUT W 4W GDM-8351 User Manual Accepts ground (COM) line in all COM Terminal 1000V 200Vpk measurements. 750V SENSE INPUT W 4W The maximum withstand voltage between this terminal and earth is 500Vpk 500Vpk. 1000V 200Vpk 750V Low current measurement...
  • Page 15 GETTING STARTED SENSE INPUT Accepts HI sense line in 4W Sense HI W 4W resistance measurement. Terminal Accepts LO sense line in 4W Sense LO resistance measurement. Terminal 1000V 200Vpk 750V 500Vpk The top row of measurement keys are used for Measurement basic DMM measurements such as voltage, Keys...
  • Page 16 GDM-8351 User Manual Measures DC + AC voltage DCV + ACV (page 32). Measures DC + DCI+ACI AC current SHIFT → EXIT (page 37). Measures resistance (2W or 4W) 2W/4W TEMP See page 42. 2W/4W Measures temperature. See TEMP TEMP (SHIFT →...
  • Page 17 GETTING STARTED As the 2ND key, selects the LOCAL measurement item on the 2 display (page 57). Pressing and holding for more than 1 second turns off the 2 display. As the Local key, releases the unit from remote control and returns the instrument to local panel operation (page 97).
  • Page 18 GDM-8351 User Manual Activates the compare COMP COMP measurement function. See (SHIFT→HOLD) SHIFT → HOLD EXIT page 70. Turns the digital filter on or off. FILTER TYPE See page 81. FILTER Sets the type of filter and TYPE TYPE the size of the rolling (SHIFT→FILTER)

  • Page 19: Display Overview

    (F, M, S) rates. Display Overview Primary measurement units Primary measurement Secondary Display function icons Secondary measurement units GDM-8351 120000 Counts Dual Measurement Multimeter n μ F AUTO HOLD RATIO UNCAL USBSTO nμF Secondary AUTOMATH...
  • Page 20 GDM-8351 User Manual Displays the units for the primary Primary Measurement measurement function. Units Displays the results of the secondary Secondary Display measurement. Displays the units for the secondary Secondary Measurement measurement function. Units Displays the secondary measurement Secondary Measurement function.

  • Page 21: Rear Panel

    GETTING STARTED Rear Panel Fuse 0.125AT/ Power Cord Digital I/O port 0.063AT Socket DIGITAL I / O LINE RATING 50 / 60 Hz 15VA MAX. FUSE LINE 100VAC 0.125AT 120VAC PASS EOM 220VAC TRIG 0.063AT SET1 SET2 SET3 SET4 240VAC DISCONNECT POWER CORD AND TEST LEADS BEFORE REPLACING FUSE RS232...
  • Page 22 GDM-8351 User Manual RS232 RS232 RS232 port. This port is used for remote control. See page 94. USB Device Port Type B USB port. This port is used for remote control. See page 94.

  • Page 23: Set Up

    GETTING STARTED Set Up Tilting the Stand From the base of the handle, gently pull the handle out sideways and then rotate it to one of the following positions. Horizontal position Tilt stand position Carry position...

  • Page 24: Power Up

    GDM-8351 User Manual Power Up 1. Ensure the correct line Steps voltage is lined up with the arrow on the fuse holder. If not, see page 141 to set the line voltage and fuse. 2. Connect the power cord to the AC voltage input.

  • Page 25: How To Use The Instrument

    GETTING STARTED How to Use the Instrument The following section will introduce to you Background how to access the basic functions on the DMM as well as how to navigate the menu system and edit the parameter values. Any of the primary functions can be used by Using the simply pressing the desired function key.
  • Page 26 GDM-8351 User Manual The menu system is navigated with the Up, Navigating the Down, Left and Right arrow keys, the Menu System Auto/Enter key and the SHIFT/EXIT key. RANGE Auto Enter SHIFT EXIT RANGE To enter the menu system, press the MENU key.
  • Page 27 GETTING STARTED When you access a menu or parameter setting, Editing a Setting or Parameter the Up, Down, Left and Right keys can be used again to edit the parameter as well. RANGE Auto Enter RANGE  If a setting or parameter is flashing, it indicates that that particular parameter can be edited.
  • Page 28 GDM-8351 User Manual PERATION Basic Measurement Overview .......... 30 Refresh Rate ............... 30 Reading Indicator ............31 Automatic/Manual Triggering ........31 AC/DC Voltage Measurement .......... 32 Select the Voltage Range ........... 33 Voltage Conversion Table .......... 35 Crest Factor Table ............36 AC/DC Current Measurement ..........

  • Page 29: Operation

    OPERATION Set the Reference Junction Temperature ....56 Dual Measurement Overview ........... 57 Supported dual measurement modes ....... 57 Using Dual Measurement Mode ....... 58 Advanced Measurement Overview ........62 Supported Advanced Measurement Functions ..62 dBm/dB/W Measurement ..........63 dBm/dB Calculation ...........

  • Page 30: Basic Measurement Overview

    GDM-8351 User Manual Basic Measurement Overview Refresh Rate The refresh rate defines how frequently the Background DMM captures and updates measurement data. A faster refresh rate yields a lower accuracy. A slower refresh rate yields a higher accuracy. Consider these tradeoffs when selecting the refresh rate.

  • Page 31: Reading Indicator

    1. The reading indicator next to the 1st display flashes according to the refresh rate setting. Automatic/Manual Triggering By default, the GDM-8351 automatically Overview triggers according to the refresh rate. See the previous page for refresh rate setting details. The TRIG IN pin of the digital I/O port or the...

  • Page 32: Ac/Dc Voltage Measurement

    GDM-8351 User Manual AC/DC Voltage Measurement The GDM-8351 can measure up to 750VAC or 1000VDC, however the CATII measurement is only rated up to 600V. 1. Press the DCV or ACV key to measure DC or Set to ACV/DCV AC voltage.

  • Page 33: Select The Voltage Range

    OPERATION Select the Voltage Range The voltage range can be set automatically or manually. To turn the automatic range selection On/Off, Auto Range press the AUTO key. Press the Up or the Down key to select the Manual Range range. The AUTO indicator turns Off automatically.
  • Page 34 GDM-8351 User Manual For example: Dynamic Range Dynamic Range A,B: Input exceeds the dynamic range. C,D: The DCV offset causes the input to exceed the upper dynamic range. E: The DCV offset causes the input to exceed the lower dynamic range.

  • Page 35: Voltage Conversion Table

    OPERATION Voltage Conversion Table This table shows the relationship between an AC and DC reading for various waveforms. Waveform Peak to Peak AC (True RMS) 2.828 1.000 0.000 Sine PK-PK 1.414 0.435 0.900 Rectified Sine (full wave) PK-PK 2.000 0.771 0.636 Rectified Sine (half wave) PK-PK...

  • Page 36: Crest Factor Table

    GDM-8351 User Manual Crest Factor Table Crest factor is the ratio of the peak signal Background amplitude to the RMS value of the signal. It determines the accuracy of AC measurement. If the crest factor is less than 3.0, voltage measurement will not result in error due to dynamic range limitations at full scale.

  • Page 37: Ac/Dc Current Measurement

    OPERATION AC/DC Current Measurement The GDM-8351 series DMMs have two input terminals for current measurement. A 1A terminal for current less than 1A and a 10A terminal for measurements up to 10A. The units can measure 0 ~ 10A for both AC and DC current.
  • Page 38 GDM-8351 User Manual SENSE INPUT W 4W 1000V 200Vpk 750V 500Vpk FUSE CAT II 600V 1.25A/1000V Max 10A...

  • Page 39: Select The Current Range

    OPERATION Select the Current Range The current range can be set automatically or manually. To turn the automatic range selection On/Off, Auto Range press the AUTO key. The most appropriate range for the currently used input jack will be automatically selected. The DMM is able to do this by remembering the last manually selected range and using that information to determine the smallest current range that the auto-range...
  • Page 40 GDM-8351 User Manual DC currents with AC components cannot be Note accurately measured if the DC+AC component exceed the dynamic range for the selected DC range. Any current exceeding the dynamic range will be clipped at the upper/lower range limit.
  • Page 41 OPERATION Maximum DCI Selected DCI Range Dynamic Range Dynamic Range DC 10mA ± 30mA max DC 100mA ± 300mA max DC 1A ± 1.25A max DC10A ± 12A max...

  • Page 42: Resistance Measurement

    GDM-8351 User Manual Resistance Measurement Uses the standard V-COM ports. Measurement 2-wire Recommended for measuring Type resistances larger than 1kΩ. Compensates the test lead effect using 4-wire the 4W compensation ports(HI/LO sense ports), in addition to the standard V-COM ports.
  • Page 43 OPERATION 4W only SENSE INPUT W 4W 4W & 2W 1000V 200Vpk 750V 500Vpk 4W only FUSE CAT II 600V 1.25A/1000V...

  • Page 44: Select The Resistance Range

    GDM-8351 User Manual Select the Resistance Range The resistance range can be set automatically or manually. To turn the automatic range selection On/Off, Auto Range press the AUTO key. Press the Up or the Down key to select the Manual Range range.

  • Page 45: Diode Test

    OPERATION Diode Test The diode test checks the forward bias characteristics of a diode by running a constant forward bias current of approximately 1mA through the DUT. 1. Press the key once to activate diode Set to Diode measurement. Measurement Note: pressing the key twice will activate the continuity measurement instead.

  • Page 46: Capacitance Measurement

    GDM-8351 User Manual Capacitance Measurement The capacitance measurement function checks the capacitance of a component. 1. Press the SHIFT → ) keys to activate Set to capacitance measurement. Capacitance Measurement 2. The mode will switch to capacitance mode immediately, as shown below.

  • Page 47: Select The Capacitance Range

    OPERATION Select the Capacitance Range The capacitance range can be set automatically or manually. To turn the automatic range selection On/Off, Auto Range press the AUTO key. Press the Up or the Down key to select the Manual Range range. The AUTO indicator turns Off automatically.

  • Page 48: Continuity Test

    GDM-8351 User Manual Continuity Test The continuity test checks that the resistance in the DUT is low enough to be considered continuous (of a conductive nature). 1. Press the key twice to activate continuity Procedure testing. Note: pressing the key once will activate diode testing.

  • Page 49: Set Continuity Threshold

    OPERATION Set Continuity Threshold The continuity threshold defines the maximum resistance allowed in the DUT when testing the continuity. 0 to 1000Ω (Default Threshold:10Ω) Range Threshold Resolution 1Ω 1. Press MENU. Procedure 2. Go to the MEAS menu on level 1 3.

  • Page 50: Continuity Beeper Settings

    GDM-8351 User Manual Continuity Beeper Settings The beeper setting defines how the GDM-8351 notifies the continuity test result to the user. Note: When the Beeper setting is off it will also turn off the keypad tones as well as any error or warning tones.

  • Page 51: Frequency/Period Measurement

    OPERATION Frequency/Period Measurement The GDM-8351 can be used to measure the frequency or period of a signal. This function can measure either the voltage frequency/period or current frequency/period, depending on which jack the input signal is input from. Range Frequency...

  • Page 52: Frequency/Period Settings

    GDM-8351 User Manual Frequency/Period Settings The input voltage/current range for frequency/period measurements can be set to Auto range or to Manual. By default, the voltage/current range is set to Auto for both the period and frequency. Range Voltage 100mV, 1V, 10V, 100V, 750V...

  • Page 53: Temperature Measurement

    OPERATION Temperature Measurement The GDM-8351 can measure temperature using a thermocouple. To measure temperature, the DMM accepts a thermocouple input and calculates the temperature from the voltage fluctuation. The thermocouple type and reference junction temperature are also considered. Temperature Thermocouple: -200°C ~ +300°C Range &...

  • Page 54: Set The Temperature Units

    GDM-8351 User Manual Set the Temperature Units ˚C, ˚F Range Units 1. Press the MENU key. Procedure 2. Go to TEMP on level 1. 3. Go to UNIT on level 2. 4. Select either C (Celsius) or F (Farenheit). 5. Press the Enter key to confirm.

  • Page 55: Select Thermocouple Type

    OPERATION Select Thermocouple Type The GDM-8351 accepts thermocouple inputs and calculates the temperature from the voltage difference of two dissimilar metals. Thermocouple type and reference junction temperature are also considered. Thermocouple Type Measurement Range Resolution type and range -200 to +300˚C 0.01 °C...

  • Page 56: Set The Reference Junction Temperature

    GDM-8351 User Manual Set the Reference Junction Temperature When a thermocouple is connected to the DMM, the temperature difference between the thermocouple lead and the DMM input terminal should be taken into account and be cancelled out; otherwise an erroneous temperature might be added. The value of the reference junction temperature should be determined by the user.

  • Page 57: Dual Measurement Overview

    OPERATION Dual Measurement Overview The dual measurement mode allows you to use the 2nd display to show another item, thus allowing you to view two different measurement results on the screen. When the multimeter is used in dual measurement mode, both displays are updated from either a single measurement or from two separate measurements.

  • Page 58: Using Dual Measurement Mode

    GDM-8351 User Manual Using Dual Measurement Mode 1. Choose one of the basic measurement functions Procedure from the table above to set the measurement mode for the primary display. For example, press DCV to set the first display to DCV measurement.
  • Page 59 OPERATION After the secondary measurement function has Editing the Measurement been activated, the rate, range and Parameters measurement item can be edited for either the primary or secondary display. Note however, it is more practical to configure the first or second measurement items before activating dual measurement mode.
  • Page 60 GDM-8351 User Manual The diagrams below describe how to connect Connection the DMM to measure a number of common dual measurement items. Voltage and Frequency/Period measurement SENSE INPUT W 4W 1000V 200Vpk 750V 500Vpk FUSE CAT II 600V 1.25A/1000V...
  • Page 61 OPERATION Voltage/Frequency/Period and Current Measurement SENSE INPUT W 4W Load 1000V 200Vpk 750V 500Vpk 0~1A FUSE CAT II 600V 1.25A/1000V 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.

  • Page 62: Advanced Measurement Overview

    GDM-8351 User Manual Advanced Measurement Overview Advanced measurement mainly refers to the type of measurement which uses the result obtained by one of the basic measurements: ACV, DCV, ACI, DCI, Resistance, Diode/Continuity, Frequency/Period, and Temperature. Supported Advanced Measurement Functions The following table lists all the advanced measurement functions and which of the basic measurement functions that they support.

  • Page 63: Dbm/Db/W Measurement

    OPERATION dBm/dB/W Measurement dBm/dB Calculation Using the ACV or DCV measurement results, Overview the DMM calculates the dB or dBm value based on a reference resistance value in the following way: dBm= 10 x log (1000 x Vreading / Rref) dB= dBm –...

  • Page 64: Power Measurement

    GDM-8351 User Manual Display Reference measurement resistance AUTO HOLD nμF AUTO MATH LIMIT SHIFT COMP FILT SWEEP GPIB REAR To set the reference resistance, use the Up and Setting the Down arrow keys. Reference Resistance The selectable reference resistances are shown below.

  • Page 65: Measure Db

    OPERATION Measure dB dB is defined as [dBm−dBmref]. When the dB measurement is activated, the DMM calculates the dBm using the reading at the first moment and stores it as dBmref. 1. Select ACV or DCV measurement. See page 32. Procedure 2.

  • Page 66: Max/Min Measurement

    GDM-8351 User Manual Max/Min Measurement Maximum and Minimum measurement function stores the highest (maximum) or lowest (minimum) reading and shows it on the first display when the 2ND key is pressed. The Max/Min function can be used with the Applicable...

  • Page 67: Relative Measurement

    OPERATION Relative Measurement Relative measurement stores a value, typically the data at that instant, as the reference. The measurement following the reference is displayed as the delta between the reference. The reference value will be cleared upon exiting. The relative function can be used with the Applicable measurements following basic measurement functions:...
  • Page 68 GDM-8351 User Manual 1. To manually set the relative reference value, Manually Set the Relative press SHIFT → REL(REL#). Reference Value The REL value is displayed on the screen at full scale. 2. Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decimal point.

  • Page 69: Hold Measurement

    OPERATION Hold Measurement The Hold Measurement function retains the current measurement data and updates it only when it exceeds the set threshold (as a percentage of the retained value). The hold function can be used with the Applicable measurements following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP 1.

  • Page 70: Compare Measurement

    GDM-8351 User Manual Compare Measurement Compare measurement checks to see if the measurement data stays between a specified upper (high) and lower (low) limit. The compare function can be used with the Applicable following basic measurement functions: measurements ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP, 1.
  • Page 71 OPERATION the high and low limits, PASS will be displayed on the secondary display, If the reading is below the low limit, LOW will be displayed. If the reading is above the high limit, HIGH will be displayed. Display Measurement Compare reading result...

  • Page 72: Math Measurement

    GDM-8351 User Manual Math Measurement Math Measurement Overview Math measurement runs three types of mathematical operations, MX+B, 1/X and Percentage based on the other measurement results. The math function can be used with the Applicable Measurements following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP...

  • Page 73: Measure 1/X

    OPERATION decimal point. 3. Press Enter to confirm the M factor settings and to automatically move onto the B offset setting. 4. Edit the B offset in the same fashion as the M factor was edited. 5. Press Enter to confirm the B offset setting and to begin the MX+B measurement.

  • Page 74: Measure Percentage

    GDM-8351 User Manual 3. Press Enter to activate the 1/X math function. The results begin immediately. Display 1/X math measurement indicator AUTO HOLD nμF AUTO MATH LIMIT SHIFT COMP FILT SWEEP GPIB Press the SHIFT → MX/MN(MATH) to Deactivate Math...
  • Page 75 OPERATION 4. Press Enter to confirm the REF% setting and to begin the Percentage measurement. Display Calculated percentage % function meausurement indicator AUTO MATH Press SHIFT → MX/MN to deactivate the Deactivate Math Measurement MATH function, or simply activate another measurement function.

  • Page 76: System/Display Configuration

    GDM-8351 User Manual YSTEM/DISPLAY CONFIGURATION View Serial Number ............77 View Version Number ............77 Brightness Settings ............78 Input Resistance Settings ..........79 Frequency/Period Input Jack Settings ......80 Digital Filter ..............81 Digital Filter Overview ..........81 Digital Filter Type Settings......... 83 Restore Factory Default Settings ........

  • Page 77: View Serial Number

    4. The firmware version number will be displayed in the secondary display. 5. Press Exit to exit from the version menu. Display For details about firmware updates, please contact Note the GW Instek Service Center or visit the GW Instek website at www.gwinstek.com.

  • Page 78: Brightness Settings

    GDM-8351 User Manual Brightness Settings The display has 5 settable brightness levels. Range Brightness 1 (dim) ~ 5 (bright) 1. Press the MENU key. Procedure 2. Go to SYSTEM on level 1. 3. Go to LIGHT on level 2. 4. Set the light setting between 1 (dim) and 5 (bright).

  • Page 79: Input Resistance Settings

    SYSTEM/DISPLAY CONFIGURATION Input Resistance Settings The 100mV and 1V DC voltage ranges can be set to an input resistance of 10MΩ or 10GΩ. This setting is only applicable for DC voltage. Range Input resistance 10MΩ, 10GΩ Default 10MΩ 1. Press the MENU key. Procedure 2.

  • Page 80: Frequency/Period Input Jack Settings

    GDM-8351 User Manual Frequency/Period Input Jack Settings The INJACK settings set which input terminal is used for frequency or period measurements. Range Injack VOLT, 1A, 10A Default VOLT 1. Press the MENU key. Procedure 2. Go to MEAS on level 1.

  • Page 81: Digital Filter

    SYSTEM/DISPLAY CONFIGURATION Digital Filter Digital Filter Overview The digital filter converts the analog input signal Filter Basics into digital format before passing it to the internal circuits for processing. The filter affects the amount of noise included in the measurement result. The digital filter averages a specific number of Filter Type input signal samples to generate one reading.
  • Page 82 GDM-8351 User Manual Filter count defines the number of samples to be Filter Count averaged per reading. More samples offer low noise but a longer delay between measurements. Less samples offer high noise but a shorter delay between measurements. 2 ~ 320...

  • Page 83: Digital Filter Type Settings

    SYSTEM/DISPLAY CONFIGURATION Digital Filter Type Settings 1. Press SHIFT → FILTER(TYPE) to enter the Procedure (Digital Filter) Type settings menu. 2. Use the Left and Right arrow keys to navigate to the filter type setting or to select the digit to be edited.
  • Page 84 GDM-8351 User Manual Display Filter indicator AUTO HOLD AUTO MATH LIMIT SHIFT COMP FILT SWEEP GPIB REAR Press FILTER to deactivate the FILTER Deactivate Digital function. Filter...

  • Page 85: Restore Factory Default Settings

    SYSTEM/DISPLAY CONFIGURATION Restore Factory Default Settings The factory default settings can be restored at anytime from the System menu. Please see the Appendix on page 140 for a list of the factory default settings. Range Factory DEF YES, NO 1. Press the MENU key. Procedure 2.

  • Page 86: Trigger

    GDM-8351 User Manual Trigger The measurements can be triggered internally or externally. When set to internal, the DMM will be triggered automatically according the refresh rate. When set to external, the DMM will wait for an external trigger signal from the Digital I/O port or from the *TRG command.

  • Page 87: External Trigger

    SYSTEM/DISPLAY CONFIGURATION External Trigger The external trigger uses the digital I/O pin for manual triggering of the DMM. Pin 5 of the digital I/O port is normally high. To trigger the DMM a low pulse of ≥10μs is needed. The *TRG command can also be used to externally trigger the DMM when the DMM is in the external trigger mode.

  • Page 88: Digital I/O

    GDM-8351 User Manual IGITAL I/O Digital I/O Overview ............89 Normal Mode ............. 90 User Mode ..............91...

  • Page 89: Digital I/O Overview

    DIGITAL I/O Digital I/O Overview The Digital I/O port is a dual function port. By default (Normal Mode) the port is used with the compare function to output Hi Fail, Lo Fail, Pass, and EOM (end of measurement) signals. In addition there is also a TRIG IN input pin.

  • Page 90: Normal Mode

    GDM-8351 User Manual Pins 1 ~ 4 are open-collector outputs, with a Wiring Diagram Pins 1 ~ 4 max input of 30mA. All outputs are active low. Ext Vcc Digital I/O Terminal Imax = 30mA Pin 1-4 Wiring Diagram Pin 5...
  • Page 91 Related DIGitalio:MODE {USER|NORM|?} Commands DIGitalio{X}:SETup {ON|OFF} 1. Connect to the GDM-8351 remotely, see page 93 Procedure for remote control options. 2. Enable the user mode using the DIGitalio:MODE command. See page 133. 3. Set the state of pins 1 ~ 4 using the...
  • Page 92 GDM-8351 User Manual Example DIG:MODE? Queries the mode. >NORM Returns Norm mode. DIG:MODE USER Sets to USER mode. DIG1:SETup ON Turns pin1 output on. DIG2:SETup ON Turns pin2 output on. DIG3:SETup ON Turns pin3 output on. DIG4:SETup ON Turns pin4 output on.

  • Page 93: Remote Control

    REMOTE CONTROL EMOTE CONTROL This chapter describes basic configuration of IEEE488.2 based remote control. For a command list, refer to the Command Overview chapter on page 99. Configure Remote Control Interface ......... 94 USB Interface ............. 94 Configure USB Interface ..........94 Configure RS232 Interface .........

  • Page 94: Configure Remote Control Interface

    GDM-8351 User Manual Configure Remote Control Interface USB Interface The USB device port on the rear panel is used for remote control. The USB port can be configured as either a TMC or CDC interface. When configured as a TMC interface, the DMM can be controlled using National Instruments NI-Visa software*.

  • Page 95: Configure Rs232 Interface

    REMOTE CONTROL 1. Connect the USB cable to the rear panel type B Steps USB port. 2. Press MENU. 3. Go to I/O on level 1. 4. Go to USB on level 2. 5. Select USB-CDC or USB-TMC. Display USB class USB menu setting indicator...
  • Page 96 GDM-8351 User Manual 2. Press MENU. 3. Go to I/O on level 1. 4. Go to RS232 on level 2 and press Enter. 5. The baud rate settings appear. Set the baud rate. 6. Press Enter to confirm the RS232 settings.

  • Page 97: Configure Eol Character

    REMOTE CONTROL Configure EOL Character The TX EOL settings set the EOL (end of line) Overview character for return messages. The EOL characters that can be received from a PC include CR, LF, CR+LF or LF+CR, with CR+LF being the most common.

  • Page 98: Return To Local Control

    GDM-8351 User Manual Return to Local Control When the unit is in remote control mode, the Background RMT icon above the main display can be seen. When this icon is not displayed, it indicates that the unit is in local control mode.

  • Page 99: Command Overview

    COMMAND OVERVIEW OMMAND OVERVIEW The Command overview chapter lists all programming commands in functional order as well as alphabetical order. The command syntax section shows you the basic syntax rules you have to apply when using commands. Command Syntax Partial compatibility IEEE488.2 Compatible Standard...
  • Page 100 GDM-8351 User Manual There are a number of different instrument Command Types commands and queries. A command sends instructions or data to the unit and a query receives data or status information from the unit. Command types A single command...
  • Page 101 COMMAND OVERVIEW Short form CONF:DIOD conf:diod Commands that contain square brackets Square Brackets indicate that the contents are optional. The function of the command is the same with or without the square bracketed items, as shown below. For example, for the query: [SENSe:]UNIT? Both SENSe:UNIT? and UNIT? are valid forms.
  • Page 102 For queries, it will return the highest possible value allowed for the particular setting. The GDM-8351 automatically sets the command Automatic parameter to the next available value. parameter range selection...

  • Page 103: Command List

    COMMAND OVERVIEW Command List Configure Commands (Display 1) CONFigure:VOLTage:DC........108 CONFigure:VOLTage:AC ........108 CONFigure:VOLTage:DCAC ........ 108 CONFigure:CURRent:DC ........108 CONFigure:CURRent:AC ........109 CONFigure:CURRent:DCAC ........ 109 CONFigure:RESistance ........109 CONFigure:FRESistance ........109 CONFigure:FREQuency ........110 CONFigure:PERiod ..........110 CONFigure:CONTinuity ........110 CONFigure:DIODe ..........
  • Page 104 GDM-8351 User Manual Measure Commands MEASure:VOLTage:DC? ........115 MEASure:VOLTage:AC? ........115 MEASure:VOLTage:DCAC? ......... 115 MEASure:CURRent:DC? ........115 MEASure:CURRent:AC? ........116 MEASure:CURRent:DCAC? ........116 MEASure:RESistance? ......... 116 MEASure:FRESistance? ........116 MEASure:FREQuency? ........116 MEASure:PERiod? ..........117 MEASure:CONTinuity? ........117 MEASure:DIODe? ..........117 MEASure:CAPacitance? ........
  • Page 105 COMMAND OVERVIEW [SENSe:]FREQuency:INPutjack? ......122 [SENSe:]PERiod:INPutjack ........122 [SENSe:]PERiod:INPutjack? ......... 122 [SENSe:]CONTinuity:THReshold ......122 [SENSe:]CONTinuity:THReshold? ....... 122 [SENSe:]UNIT ............123 [SENSe:]UNIT? ............. 123 [SENSe:]FUNCtion[1/2] ........123 [SENSe:]FUNCtion[1/2]? ........123 Calculate Commands CALCulate:FUNCtion ........... 124 CALCulate:FUNCtion? ......... 124 CALCulate:STATe ..........124 CALCulate:STATe? ..........
  • Page 106 GDM-8351 User Manual TRIGger:SOURce ..........129 TRIGger:SOURce? ..........129 TRIGger:AUTO ............. 129 TRIGger:AUTO? ........... 129 SAMPle:COUNt ........... 129 SAMPle:COUNt? ..........129 TRIGger:COUNt ........... 130 TRIGger:COUNt? ..........130 System Commands SYSTem:BEEPer:STATe ........131 SYSTem:BEEPer:STATe? ........131 SYSTem:BEEPer:ERRor ........131 SYSTem:BEEPer:ERRor? ........131 SYSTem:BEEPer ...........
  • Page 107 COMMAND OVERVIEW Common Commands *CLS ..............135 *ESE? ..............135 *ESE ..............135 *ESR? ..............135 *IDN? ..............136 *OPC?..............136 *OPC ..............136 *PSC? ..............136 *PSC ..............136 *RST ..............136 *SRE? ..............136 *SRE ..............136 *STB? ..............137 *TRG ..............

  • Page 108: Configure Commands (Display 1)

    GDM-8351 User Manual CONFigure Commands CONFigure:VOLTage:DC Sets measurement to DC Voltage on the first display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF:VOLT:DC 1 Sets the voltage range to 1 volt. CONFigure:VOLTage:AC Sets measurement to AC Voltage on the first display and specifies the range.

  • Page 109: Configure:current:ac

    COMMAND OVERVIEW CONFigure:CURRent:AC Sets measurement to AC Current on the first display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF:CURR:AC 10e-2 Sets the measurement mode to ACI with a 100mA range. CONFigure:CURRent:DCAC Sets measurement to DC+AC Current on the first display and specifies the range.

  • Page 110: Configure:frequency

    GDM-8351 User Manual CONFigure:FREQuency Sets measurement to Frequency on the first display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF:FREQ MAX Sets the frequency measurement range to max. CONFigure:PERiod Sets measurement to Period on the first display and specifies the range.

  • Page 111: Configure:capacitance

    COMMAND OVERVIEW CONFigure:CAPacitance Sets measurement to Capacitance on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF:CAP 10E-6 Sets the measurement mode to Capacitance with a 10μF Range. CONFigure:FUNCtion? Returns the current function on the first display. Return parameter: VOLT, VOLT:AC,VOLT:DCAC, CURR, CURR:AC,CURR:DCAC, RES, FRES, FREQ, PER, TEMP, DIOD, CONT, CAP...

  • Page 112: Configure2:Voltage:dc

    GDM-8351 User Manual Secondary Display: CONFigure2 Commands CONFigure2:VOLTage:DC Sets measurement to DC Voltage on the second display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF2:VOLT:DC 1 Sets the voltage range to 1 volts.

  • Page 113: Configure2:Resistance

    COMMAND OVERVIEW CONFigure2:RESistance Sets measurement to 2W Resistance on the second display and specifies the range. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: CONF2:RES 10e3 Sets the range to 10kΩ on the second display. CONFigure2:FRESistance Sets measurement to 4W Resistance on the second display and specifies the range.

  • Page 114: Configure2:Function

    GDM-8351 User Manual CONFigure2:FUNCtion? Returns the current function on the second display. Return parameter: VOLT, VOLT:AC, CURR, CURR:AC, RES, FRES, FREQ, PER, NON CONFigure2:RANGe? Returns the range of the current function on the second display. Return parameter: DCV: 0 .1(100mV), 1(1V), 10(10V), 100(100V), 1000(1000V) ACV: 0.1(100mV), 1(1V), 10(10V), 100(100V), 750(750V)

  • Page 115: Measure Commands

    COMMAND OVERVIEW Measure Commands MEASure:VOLTage:DC? Returns the DC voltage measurement on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS:VOLT:DC? > +0.10348E-01 Returns the DC voltage measurement as 0.010348 V. MEASure:VOLTage:AC? Returns the AC voltage measurement on the first display. Parameter: [None] | [Range(<NRf>...

  • Page 116: Measure:current:ac

    GDM-8351 User Manual MEASure:CURRent:AC? Returns the AC current measurement on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS:CURR:AC? > +0.00872E-02 Returns the AC current measurement as 0.0872mA. MEASure:CURRent:DCAC? Returns the DC+AC current measurement on the first display.

  • Page 117: Measure:period

    COMMAND OVERVIEW MEASure:PERiod? Returns the period measurement on the first display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS:PER? MAX Returns the period at the maximum range. MEASure:CONTinuity? Returns the continuity measurement on the first display. Example: MEAS:CONT? Returns the continuity.

  • Page 118: Measure2:Voltage:dc

    GDM-8351 User Manual MEASure2:VOLTage:DC? Returns the DC voltage measurement on the second display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS2:VOLT:DC? >+0.10321E-01 Returns the DC voltage measurement as 0.010321V. MEASure2:VOLTage:AC? Returns the AC voltage measurement on the second display.

  • Page 119: Measure2:Fresistance

    COMMAND OVERVIEW MEASure2:FRESistance? Returns the 4W resistance measurement on the second display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS2:FRES? > +1.00023E+03 Returns the 4W measurement. MEASure2:FREQuency? Returns the frequency measurement on the second display. Parameter: [None] | [Range(<NRf> | MIN | MAX | DEF)] Example: MEAS2:FREQ? >...

  • Page 120: [Sense:]Temperature:rjunction:simulated

    GDM-8351 User Manual [SENSe:]TEMPerature:RJUNction:SIMulated Set temperature simulation value. Parameter: <NRf>(0.00 ~ 50.00) Example: SENS:TEMP:RJUN:SIM 25.00 Sets the thermocouple junction temperature to 25˚C. [SENSe:]TEMPerature:RJUNction:SIMulated? Returns temperature simulation value. Return parameter: <NR1> (+0000~+5000) ,where +0000=0.00˚C, +5000=50.00˚C [SENSe:]DETector:RATE Sets the detection rate (sample rate)

  • Page 121: [Sense:]Average:count

    COMMAND OVERVIEW [SENSe:]AVERage:COUNt Sets the digital filter average count. Parameter: <NR1> (2~320)|MIN|MAX Example: SENS:AVER:COUN 100 Sets the digital filter average count to 100. [SENSe:]AVERage:COUNt? Returns the current digital filter average count. Return parameter: <NR1>(+002 ~ +320) [SENSe:]AVERage:WINDow Sets the digital filter window. Parameter: 0.01|0.1|1|10|0 (none) Example: SENS:AVER:WIND 0.1 Sets the digital filter window to 0.1%.

  • Page 122: [Sense:]Frequency:inputjack

    GDM-8351 User Manual [SENSe:]FREQuency:INPutjack Assigns an input terminal for the frequency function. Parameter: (0|1|2) 0=volt, 1=1A, 2=10A Example: SENS:FREQ:INP 0 Sets the input jack to the Volt input terminal. [SENSe:]FREQuency:INPutjack? Returns the assigned input terminal used for the frequency function.

  • Page 123: [Sense:]Unit

    COMMAND OVERVIEW [SENSe:]UNIT Sets the temperature unit. Parameter: C|F Example: SENS:UNIT C Sets the temperature unit to ˚C. [SENSe:]UNIT? Returns the temperature unit. [SENSe:]FUNCtion[1/2] Sets the function for the first or second display. Parameter: (display1):"VOLT[:DC]", "VOLT:AC", “VOLT:DCAC”, "CURR[:DC]", "CURR:AC", “CURR:DCAC”, "RES", “FRES”, "FREQ", "PER", "TEMP:TCO", "DIOD", "CONT", “CAP”...

  • Page 124: Calculate Commands

    GDM-8351 User Manual 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 125: Calculate:hold:reference

    COMMAND OVERVIEW CALCulate:HOLD:REFerence Sets the percentage threshold for the Hold function. Parameter: <NRf> (0.01, 0.1, 1, 10) Example: CALC:HOLD:REF 10 Sets the hold percentage to 10%. CALCulate:HOLD:REFerence? Returns the percentage threshold from the Hold function. CALCulate:REL:REFerence Sets the reference value for the relative function. Parameter: <NRf>...

  • Page 126: Calculate:limit:upper

    GDM-8351 User Manual CALCulate:LIMit:UPPer? Returns the upper limit of the compare function. CALCulate:DB:REFerence Sets the reference value for the dB function. Parameter: <NRf> | MIN | MAX Example: CALC:DB:REF MAX Sets the reference voltage for dB measurements to the maximum allowed.

  • Page 127: Calculate:math:mbfactor

    COMMAND OVERVIEW CALCulate:MATH:MBFactor Sets the offset factor B for math measurements. Parameter: <NRf> | MIN | MAX Example: CALC:MATH:MBF MIN Sets the offset factor B to the minimum allowed value. CALCulate:MATH:MBFactor? Returns the offset factor B used in the math measurement. CALCulate:MATH:PERCent Sets the reference value for the Percent function.

  • Page 128: Trigger Commands

    GDM-8351 User Manual TRIGger Commands READ? Returns 1 and 2 display value. Example1: SAMP:COUN 4(USBTMC) READ?(count = SAMP:COUN/2, rounded up) >+0.10212E-01,+0.00000E+00,+0.10348E-01,+0.00000E+00 Queries 2 counts of measurement samples from the first and second display. Example2: SAMP:COUN 3(USBCDC or RS232) READ?(Count = 3) >+0.10212E-01,+0.00000E+00,+0.10348E-01,+0.00000E+00,...

  • Page 129: Trigger:source

    COMMAND OVERVIEW TRIGger:SOURce Selects the trigger source. Parameter: INT | EXT Example: TRIG:SOUR INT Sets the trigger source as internal. TRIGger:SOURce? Returns current trigger source. TRIGger:AUTO Turns Trigger Auto mode on/off. Parameters: ON | OFF Example: TRIG:AUTO OFF Turns the Trigger Auto mode off. TRIGger:AUTO? Returns the Trigger Auto mode.

  • Page 130: Trigger:count

    GDM-8351 User Manual TRIGger:COUNt Sets the number of trigger counts. Parameter: <NR1>(1 ~ 9999) | MIN | MAX Example: TRIG:COUN 10 Sets the number of trigger counts to 10. TRIGger:COUNt? Returns the number of trigger counts. Parameter: None | MIN | MAX...

  • Page 131: System Commands

    COMMAND OVERVIEW 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. Return parameter: Beep on Pass | Beep on Fail | No Beep SYSTem:BEEPer:ERRor Sets the beeper to sound on an SCPI error.

  • Page 132: System:display

    GDM-8351 User Manual SYSTem:DISPlay Turns the Display on/off. Parameter: ON | OFF Example: SYST:DISP ON Turns the display on. SYSTem:DISPlay? Returns the status of the display Return parameter: 0|1, 0=OFF, 1=ON SYSTem:SERial? Returns the serial number (nine characters/numbers) INPut:IMPedance:AUTO Sets the input impedance for DCV mode (100mV range and 1V range).

  • Page 133: Display:text:clear

    COMMAND OVERVIEW DISPlay:TEXT:CLEar Clear message from display. Parameter:NONE Example: DISP:TEXT:CLE DIGitalio:MODE Sets the mode for Digital I/O. Parameter: NORM|USER Example: DIG:MODE NORM Sets the Digital I/O Mode to normal. DIGitalio:MODE? Returns the Digital I/O mode. Return parameter: NORM|USER DIGitalio[1|2|3|4]:SETup Sets the status for Digital I/O(only for user mode). Parameter: ON|OFF Example: DIG1:SET ON DIGitalio[1|2|3|4]:SETup?

  • Page 134: Status Commands

    GDM-8351 User Manual STATus Report Commands STATus:QUEStionable:ENABle Set bits in the Questionable Data Enable register. STATus:QUEStionable:ENABle? Returns the contents of the Questionable Data Enable register. STATus:QUEStionable:EVENt? Returns the contents of the Questionable Data Event register. STATus:PRESet Clears the Questionable Data Enable register.

  • Page 135: System:rwlock

    COMMAND OVERVIEW SYSTem:RWLock Enables remote control and disables local control (front panel control). Once this command has been issued, pressing the 2ND or local buttons will not return the user to local control. The only way to return to local mode is to issue the SYSTem:LOCal command.

  • Page 136: Idn

    GDM-8351 User Manual *IDN? Returns the manufacturer, model No., serial number and system version number. Example: *IDN? >GWInstek,GDM8351,00000000,1.0 *OPC? “1” is placed in the output queue when all the pending operations are completed. *OPC Sets the operation complete bit (bit0) in SERS (Standard Event Status Register) when all pending operations are completed.

  • Page 137: Stb

    COMMAND OVERVIEW *STB? Returns the SBR (Status Byte Register) contents. Example:*STB? >64 Returns the contents of the SBR as 01000000. *TRG Manually triggers the DMM. For the following command sets, please refer to the status system diagram on page 144. STAT: QUES:EVEN? STAT: QUES: ENAB STAT: QUES: ENAB?

  • Page 138: Faq

    GDM-8351 User Manual The DMM performance doesn’t match the specifications. Make sure the device is powered On for at least 30 minutes, within 18~28˚C. This is necessary to stabilize the unit to match the specifications. The measured voltage does not match the expected value.

  • Page 139: Appendix

    APPENDIX PPENDIX System Menu Tree LEVEL 1 SYSTEM MEAS TEMP TX TERM LEVEL 2 UPDATE Vx.xx LEVEL 2 TX EOL CR+LF LF+CR LEVEL 2 RS232 USB-CDC 9600 USB-TMC 19200 38400 57600 115200 LEVEL 2 SENSOR UNIT TYPE J 23.00 TYPE K TYPE T LEVEL 2 CONT...

  • Page 140: Factory Default Settings

    GDM-8351 User Manual Factory Default Settings Measurement Item Range AUTO Rate SYSTEM Menu BEEP: Pass LIGHT: 3 S/N: N/A FACTORY: NO MEAS Menu CONT: 0010Ω INJACK: VOLT INPUT R: 10M TEMP Menu SENSOR: TYPE J SIM: 23.00 UNIT: C I/O Menu...

  • Page 141: Replacing The Ac Source Fuse

    APPENDIX Replacing the AC Source Fuse Rating Size Fuse Ratings Type 100VAC, 120VAC 5mm X 20mm 0.125AT 220VAC, 240VAC 5mm X 20mm 0.063AT Only replace the fuse with a fuse of the correct type Note and rating. 1. Turn the DMM off and take out the power cord. Steps 2.

  • Page 142: Replacing The Input Fuse

    GDM-8351 User Manual Replacing the Input Fuse Rating Size Fuse Rating Type 1.25A 1000V 6.3mm X 32mm F1.25A Only replace the fuse with a fuse of the correct type Note and rating. 1. Turn the DMM off. Steps 2. Press the fuse holder with your finger and turn anticlockwise.
  • Page 143 APPENDIX 3. Replace the fuse at the end of the holder with the correct type and rating. 4. Push the fuse holder back into the panel and turn clockwise when the fuse holder is level with the front panel.

  • Page 144: Status System

    GDM-8351 User Manual 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...

  • Page 145: Specifications

    APPENDIX Specifications The specifications apply when the DMM is warmed up for at least 30 minutes and operates in the slow rate. Below are the basic conditions required to operate the DMM within specifications: Calibration: Yearly  Accuracy: ± (% of Reading + Digits) ...
  • Page 146 GDM-8351 User Manual DC Voltage Range Resolution Full Scale Accuracy 100.000mV 0.001mV 120.000 0.012% + 8 1.00000 V 0.00001V 1.20000 0.012% + 5 10.0000 V 0.0001V 12.0000 0.012% + 5 100.000 V 0.001V 120.000 0.012% + 5 1000.00 V 0.01 V 1020.00...
  • Page 147 APPENDIX [1] [2] Resistance Current Range Resolution full scale Accuracy (4W) source 100.000Ω 0.001Ω 120.000 0.05% + 8 1.00000KΩ 0.00001KΩ 1.20000 1 mA 0.05% + 5 10.0000KΩ 0.0001KΩ 12.0000 μ 0.05% + 5 100.000KΩ 0.001KΩ 120.000 0.05% + 5 μ 1.00000MΩ...
  • Page 148 GDM-8351 User Manual AC Current Accuracy [1][3] Range Resolution Full Scale 20 Hz to 45 45 Hz to 2 2 kHz to 10KHz 10.0000mA 0.0001mA 12.0000 1.5% + 100 0.5% + 100 2% + 200 100.000mA 0.001mA 120.000 1.5% + 100 0.5% + 100 2% + 200 1.00000A...
  • Page 149 APPENDIX Thermocouple Specifications Measurement Accuracy Accuracy Type Range Resolution (-200 ~ 0°C) (0 ~ 300°C) J, K, T -200 ~ +300°C 0.01°C 0.4°C 0.2°C *Specifications do not include probe accuracy. Capacitance Range Resolution Full Scale Test Current Accuracy μ 10.00nF 0.01nF 12.00 2.0%+10...

  • Page 150: Additional Specifications

    GDM-8351 User Manual Additional Specifications The Additional Specifications apply in addition to the Specifications listed on page 145 when the operating temperature exceeds 18˚C ~ 28˚C. DC Voltage Measurement method: Sigma Delta A-to-D converter. Input protection: 1000V peak on all ranges.
  • Page 151 APPENDIX AC Voltage (AC Coupling Mode/AC + DC Coupling Mode) Measurement method: AC coupled true RMS - measure the AC component with up to 400 VDC bias on any range. Crest Factor: Maximum 3 at full scale. Input Impedance: 1 MΩ ± 2% in parallel with <100 pF on all ranges. Maximum input voltage: 750 Vrms on all ranges.
  • Page 152 GDM-8351 User Manual AC Current (AC Coupling Mode/AC + DC Coupling Mode) Measurement method: Current to the fuse and current shunt, AC coupled true RMS measurement (measures the AC component only). Crest factor: Maximum of 3 at full scale. Rate...
  • Page 153 APPENDIX Resistance (2-wire resistance and 4-wire resistance) Measurement method: 2-wire resistance or 4-wire resistance. Open-circuit voltage: Approximately 7.5 VDC. Input protection: 500Vpeak on all ranges. Diode Measurement method: 1mA ±2% constant current source. Open-circuit voltage: Approximately 7.5 VDC. Input protection: Input protection of 500V peak. Rate Additional Rate Error Count Fast...
  • Page 154 GDM-8351 User Manual Frequency Measurement method: Reciprocal counting technique. Input impedance: 1M ± 2% in parallel with <100pF on all ranges. Ω Maximum input voltage: 750 Vrms on all ranges. Input protection: 1200V peak on all ranges with gas discharge.

  • Page 155: Temperature Coefficients

    APPENDIX Measurement Noise Rejection DC Common mode reject ratio (DC CMRR): For 1 kΩ unbalanced LO lead , 50/60 Hz ± 0.1%: DC > 90 dB. Temperature Coefficients Specified ambient temperature range accuracy is typically within the calibration temperature (Tcal) ± 5°C range. If the operating environment of the multimeter is within 0°C to (Tcal)-5°C or (Tcal)+5°C to 50°C (specification units/°C), you must add the additional temperature coefficient errors to the accuracy...

  • Page 156: Dimensions

    GDM-8351 User Manual Dimensions GDM-8351 Units = mm. GDM-8351 120000 Counts Dual Measurement Multimeter SENSE INPUT W 4W 1000V 200Vpk 750V POWER DC + AC RANGE LOCAL 500Vpk TEMP 2W/4W Hz/P Auto REL# MATH COMP TYPE Enter FUSE SHIFT CAT II 600V...

  • Page 157: Declaration Of Conformity

    No. 69 Lushan Road, Suzhou New District Jiangsu, China. declare that the below mentioned product Type of Product: Digital Multimeter Model Number: GDM-8351 are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (2004/108/EC) and Low Voltage Directive (2006/95/EC).
  • Page 158 GDM-8351 User Manual NDEX Accessories ......... 12 setting ..........48 Conventions ....... 25 Advanced measurement Current compare .......... 70 ..........65 range ..........39 dBm/dB calculation ..... 63 setting ..........37 dBm/W .......... 63 Declaration of conformity ..157 Digital filter settings ..... 83 Digital I/O ........

  • Page 159: Index

    INDEX Main features ......11 Serial number ......77 Marketing Service operation contact .......... 138 about disassembly ......6 Menu tree ........139 contact .......... 138 Specifications ......145 Period Status system ......144 setting ..........51 Power up ........24 System menu tree .....

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