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GW Instek GDM-8300 User Manual

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Dual Measurement Multimeter
GDM-834X Series
USER MANUAL
GW INSTEK PART NO. 82DM-83420E01
ISO-9001 CERTIFIED MANUFACTURER
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.
Good Will Instrument Co., Ltd. No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.
Table of Contents
Table of Contents
SAFETY INSTRUCTIONS .................................................. 5
GETTING STARTED ........................................................ 10
Characteristics .......................................... 11
Appearance ............................................... 14
Set Up ....................................................... 24
OPERATION .................................................................. 29
Basic Measurement Overview ................... 31
AC/DC Voltage Measurement ................... 33
AC/DC Current Measurement ................... 39
Resistance Measurement .......................... 43
Diode Test ................................................ 45
Capacitance Measurement ........................ 46
Continuity Test .......................................... 48
Frequency/Period Measurement ............... 51
Temperature Measurement ....................... 53
Dual Measurement Overview .................... 57
Advanced Measurement Overview ............ 62
dBm/dB/W Measurement ......................... 63
Max/Min Measurement ............................. 66
Relative Measurement .............................. 67
Hold Measurement ................................... 69
Compare Measurement ............................. 70
Math Measurement ................................... 72
SYSTEM/DISPLAY CONFIGURATION.............................. 76
View Serial Number .................................. 77
View Version Number ............................... 77
Brightness Settings ................................... 78
Input Resistance Settings ......................... 79
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GDM-834X Series User Manual
Frequency/Period Input Jack Settings ........ 80
Compatibility Settings ............................... 81
Restore Factory Default Settings ............... 82
USB STORE .................................................................... 83
USB Store Overview .................................. 84
REMOTE CONTROL ...................................................... 101
Configure Remote Control Interface ........ 102
Return to Local Control ........................... 105
COMMAND OVERVIEW ................................................ 106
Command Syntax .................................... 106
Command List ........................................ 111
FAQ .............................................................................. 142
APPENDIX .................................................................... 143
System Menu Tree ................................... 143
Factory Default Settings .......................... 144
Replacing the AC Source Fuse ................. 145
Replacing the Input Fuse ........................ 146
Status system ......................................... 148
Specifications ......................................... 149
Dimensions ............................................ 155
Declaration of Conformity ....................... 156
INDEX .......................................................................... 157
4
Table of Contents
WARNING
Warning: Identifies conditions or practices that could result in injury or loss of life.
CAUTION
Caution: Identifies conditions or practices that could result in damage to the DMM or to other properties.
DANGER High Voltage
Attention Refer to the Manual
Protective Conductor Terminal
Earth (ground) Terminal
Do not dispose electronic equipment as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased.
SAFETY 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.
5
GDM-834X Series User Manual
General Guideline
CAUTION
Make sure that the voltage input level does not
exceed DC1000V/AC750V.
Make sure the current input level does not
exceed 12A.
Do not place any heavy object on the
instrument.
Avoid severe impact or rough handling that can
lead to damaging the instrument.
Do not discharge static electricity to the
instrument.
Use only mating connectors, not bare wires, for
the terminals.
Do not block or obstruct the cooling fan vent
opening.
Do not perform measurement at the source of a
low-voltage installation or at building installations (Note below).
Do not disassemble the instrument unless you
are qualified as service personnel.
Make sure that the COM terminal to earth is
limited to 500Vpk.
(Note) EN 61010-1:2010 specifies the measurement categories and their requirements as follows. The GDM-834X falls under category II 600V.
Measurement category IV is for measurement performed at the
source of low-voltage installation.
Measurement category III is for measurement performed in the
building installation.
Measurement category II is for measurement performed on the
circuits directly connected to the low voltage installation.
Safety Guidelines
6
SAFETY INSTRUCTIONS
Power Supply
WARNING
AC Input voltage: 100/120/220/240 V AC 50/60Hz 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.
Fuse
WARNING
Fuse type: 0.125AT 100/120VAC
0.063AT 220/240 VAC
Make sure the correct type of fuse is installed
before power up.
To avoid risk of fire, replace the fuse only with
the specified type and rating.
Disconnect the power cord before fuse
replacement.
Make sure the cause of a fuse blowout is fixed
before fuse replacement.
Cleaning the Instrument
Disconnect the power cord before cleaning. Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid.
Do not use chemicals containing harsh material
such as benzene, toluene, xylene, and acetone.
Operation Environment
Location: Indoor, no direct sunlight, dust free,
almost non-conductive pollution (Note below)
Temperature: Full accuracy for 0°C to 50°C Humidity: 0~35°C : < 80%RH
>35°C: <70%RH
Altitude: <2000m
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GDM-834X Series User Manual
(Note) EN 61010-1:2010 specifies the pollution degrees and their requirements as follows. The GDM-8342/8341 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, non-conductive
pollution occurs. The pollution has no influence.
Pollution degree 2: Normally only non-conductive pollution
occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected.
Pollution degree 3: Conductive pollution occurs, or dry, non-
conductive pollution occurs which becomes conductive due to condensation which is expected. In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither temperature nor humidity is controlled.
Storage environment
Location: Indoor Temperature: -10°C to 70°C Humidity: 0~35°C : <90%RH
>35°C : <80%RH
Disposal
Do not dispose this instrument as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased. Please make sure discarded electrical waste is properly recycled to reduce environmental impact.
8
SAFETY INSTRUCTIONS
Green/ Yellow:
Earth
Blue:
Neutral
Brown:
Live (Phase)
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:
As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with either the letter E, the earth symbol
or coloured Green/Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact the supplier.
This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, a cable of 0.75mm2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.
Any exposed wiring from a cable, plug or connection that is engaged in a live socket is extremely hazardous. If a cable or plug is deemed hazardous, turn off the mains power and remove the cable, any fuses and fuse assemblies. All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard.
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GDM-834X Series User Manual
Characteristics ................................................................ 11
Accessories ................................................................ 12
Package Contents....................................................... 13
Appearance ..................................................................... 14
GDM-8342/8341 Front Panel .................................... 14
Display Overview ....................................................... 20
Rear Panel .................................................................. 22
GETTING STARTED
This chapter describes the GDM-8342 and GDM-8341 multimeters in a nutshell, including accessories, and package contents, their main features and front / rear panel introduction.
10
GETTING STARTED
Performance
DCV accuracy: 0.02% High current range: 10A High Voltage range: 1000V High ACV frequency response: 100kHz
Features
50000 count display Multi functions: ACV, DCV, ACI, DCI, R, C, Hz,
Temp*, Continuity, Diode test, MAX/MIN, REL, dBm, Hold, MX+B, 1/X, REF%, dB, Compare.
Manual or Auto ranging AC true RMS Data Logging to USB* Data logging to PC using an Excel Add-In
Interface
Voltage/Resistance/Diode/Capacitance/
Temperature* input
Current input USB device port as standard for remote control USB host* for data logging Optional GPIB* (factory install) Calibration port (for service operators only) Excel Add-In for easy-to-use remote control,
data logging and for saving/recalling setups
* These features are only available on the GDM-
8342
Characteristics
The GDM-8342 and GDM-8341 are portable, dual-display digital multimeters suitable for a wide range of applications, such as production testing, research, and field verification.
11
Accessories
Standard Accessories
Part number
Description 82DM-83420E01
User Manual CD
82DM-83421M01
Safety Instruction Sheet
GTL-207
Test leads: 1x red, 1x black
Optional Accessories
Part number
Description
1040-8342020
GPIB (Factory installed, GDM-8342 only)
GTL-246
USB Cable
GTL-205
Temperature Probe Adapter with Thermal Coupling (K­type)
Download
Name
Description
gdmvcp.inf (In GDM-834X USB DRIVER.ZIP)
USB driver
GDM-834x Excel Addins
Data logging Excel Add-In logs measurements to a PC by remote control via the USB interface only. This Excel Add-In can’t be used via the GPIB interface.
GDM-834X Series User Manual
12
GETTING STARTED
Opening the box
Contents (single unit)
Main unit Test leads (red x1,
black x1)
USB cable x1
Power cord x1 (region
dependent)
User manual CD Safety instruction
sheet
Package Contents
Check the contents before using the instrument.
13
GDM-834X Series User Manual
Function keys and
Arrow keys
DC/AC 0.5A Terminal,
AMPS Fuse Holder
Power Switch, USB Host
port (GDM-8342 only)
Main
Display
DC/AC 12A Terminal
COM Terminal
V Terminal
TEMP
DC + AC
Auto
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
USB STOINT/EXTCOMPMATHREL#
LOCAL
dBmdBACIDCI
50000 Counts Dual Measurement Multimeter
GDM-8342
POWER
Enter
RANGE
RANGE
SHIFT
EXIT
MENUTRIGHOLDMX/MNREL
2NDHz/P
/W/
ACVDCV
W
Power Switch
POWER
Turns On or Off the main power. For the power up sequence, see page 25.
USB Host Port
The Host port is a type A USB port for logging data. See the USB Store chapter for more details, page 83.
Note: GDM-8342 only.
Main Display
Shows measurement results and parameters. For display configuration details, see page 78 (light setting).
For an overview of the main display, see page 20.
Appearance
GDM-8342/8341 Front Panel
14
GETTING STARTED
W
V
Input
Terminal
W
V
INPUT
750V
1000V
MAX
This terminal is used for all measurements except for DC/AC current measurements.
COM Terminal
COM
W
V
INPUT
12A
MAX
750V
1000V
MAX
Accepts ground (COM) line in all measurements.
The maximum withstand voltage between this terminal and earth is 500Vpk.
DC/AC 0.5A Terminal
AMPS Fuse Holder
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Low current measurement terminal. Accepts DC/AC Current input. For details see page 39.
DC: 500μA~0.5A AC: 500μA~0.5A
As a fuse, protects the instrument from over-current. Rating: T0.5A, 250V.(This terminal accepts DC/AC current input)
For the fuse replacement procedure, see page 146.
DC/AC 12A Terminal
COM
W
V
INPUT
12A
MAX
750V
1000V
MAX
High range current measurement terminal. Accepts DC/AC Current input. For DCI or ACI details, see page 39.
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GDM-834X Series User Manual
Measurement Keys
The top row of measurement keys are used for basic DMM measurements such as voltage, current, resistance, capacitance and frequency. The bottom row of measurement functions are used for more advanced functions.
Each key has a primary and secondary function. The secondary function is accessed in conjunction with the SHIFT key.
Upper Measurement keys
DCV
DCV
DCI
Measures DC Voltage (page 33).
DCI (SHIFT→DCV)
SHIFT
EXIT
→
DCV
DCI
Measures DC Current (page
39).
ACV
ACV
ACI
Measures AC Voltage (page 33).
ACI (SHIFT→ACV)
SHIFT
EXIT
→
ACV
ACI
Measures AC Current (page
39).
DCV + ACV
DCV
DCI
+
ACV
ACI
Measures DC + AC voltage (page 33).
DCI+ACI
SHIFT
EXIT
→
DCV
DCI
+
ACV
ACI
Measures DC + AC current (page 39).
16
GETTING STARTED
Resistance/ Continuity)
/
W
dB
Measures resistance or continuity, depending on the selected mode. See page 43 and 48, respectively.
dB (SHIFT→ Ω/ )
SHIFT
EXIT
→
/
W
dB
Measures dB. See page 65.
Diode/ Capacitance
/
dBm
Tests diodes or measures capacitance, depending on the selected mode. See page 45 and 46, respectively.
dBm (SHIFT →
/
)
SHIFT
EXIT
→
/
dBm
Measures dBm. See page 63
Hz/P
Hz/P
TEMP
Measures the frequency or period or a signal, depending on the selected mode. See page 51.
TEMP (SHIFT → Hz/P)
SHIFT
EXIT
→
Hz/P
TEMP
Measures temperature. See page 53.
2ND
2ND
LOCAL
As the 2nd key, selects the measurement item on the 2nd display (page 57). Pressing and holding for more than 1 second turns off the 2nd display.
As the Local key, releases the remote control and returns the instrument to local panel operation (page 105).
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GDM-834X Series User Manual
Lower Measurement keys
REL
REL
REL#
Measures the Relative value (page
67).
REL# (SHIFT→REL)
SHIFT
EXIT
→
REL
REL#
Manually sets the reference value for the Relative value measurement.
MX/MN
MX/MN
MATH
Measures the Maximum or the Minimum value (page 66).
MATH (SHIFT→ MX/MN)
SHIFT
EXIT
→
MX/MN
MATH
Enters the Math measurement mode. The supported math functions include MX+B, REF% and 1/X. See page 72 for details.
HOLD
HOLD
COMP
Activates the Hold function (page
69).
COMP (SHIFT→HOLD)
SHIFT
EXIT
→
HOLD
COMP
Activates the compare measurement function. See page 70.
TRIG
TRIG
INT/EXT
Triggers sample acquisition manually when the trigger is set to external triggering. See page 32. (Note: Not supported for capacitance measurement)
INT/EXT (SHIFT→TRIG)
SHIFT
EXIT
→
TRIG
INT/EXT
Toggles the trigger source as either internal or external(manual trigger).
18
GETTING STARTED
MENU
MENU
USB STO
Enters the configuration menu for System Settings, Measurement Settings, Temperature measurement settings, I/O settings and USB storage settings. See page 76 for the system menu.
USB STO (SHIFT→MENU)
SHIFT
EXIT
→
MENU
USB STO
Logs measurement data to a USB drive. This function is only available for the GDM-8342. See page 83.
SHIFT/EXIT
SHIFT
EXIT
When used as a SHIFT key, it is used to access the secondary functions associated with the measurement keys.
When used as an EXIT key, it will exit out of menu systems.
AUTO/ENTER
Auto
Enter
When used as an AUTO key, it will set the range of the selected function to autorange.
When used as an ENTER key, it will confirm the entered value or menu item.
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GDM-834X Series User Manual
Arrow Keys
RANGE
RANGE
The arrow keys are used to navigate the menu system and edit values.
The Up and Down arrow keys will also manually set the range for the voltage and current measurements.
The Left and Right arrow keys will also toggle the refresh rate between the fast, medium and slow rates.
Primary Display
Secondary Display
Function status icons
Secondary
measurement units
Primary measurement units
Primary measurement
function icons
Secondary measurement function icons
REARGPIBUSBLANRS232FILTRCLSTOCOMP2ND
dBmEXTSHIFTERRLIMITAUTOMATH4W2WDCAC
AVmm
HzWkM
WSFC
mdB
%
AVmm
HzWkM
WSFC
RMTMAXMINRELHOLDSMFAUTO4W2WDCAC
USBSTO
nμF
MEMRATIO UNCAL
nμF
50000 Counts Dual Measurement Multimeter
GDM-8342
Primary Measurement Function Icons
Displays the primary measurement function.
Primary Measurement Units
Displays the units for the primary measurement function.
Secondary Display
Displays the results of the secondary measurement.
Display Overview
20
GETTING STARTED
Secondary Measurement Units
Displays the units for the secondary measurement function.
Secondary Measurement function icons
Displays the secondary measurement function.
Function Status Icons
Display status icons for operations/functions that are not linked to the primary or secondary functions.
Primary Display
Displays the results of the primary measurement.
21
Rear Panel
USB Device Port,
Calibration Port
Power Cord Socket
Fuse
0.125AT/0.063AT
CALIBRATION
SER.NO. LABEL
50 / 60 Hz
15VA MAX.
LINE RATING
FUSE LINE
100VAC 120VAC
220VAC 240VAC
0.125AT
0.063AT
TEST LEADS BEFORE REPLACING FUSE
DISCONNECT POWER CORD AND
REMOVE INPUTS BEFORE OPENING.
TO AVOID SHOCK,
WARNING
USE ONLY
GPIB
Optional GPIB port
(GDM-8342 only)
100
220
120
240
GPIB Port
GPIB
The GPIB port can be used for remote control. This is a factory installed option for the GDM-8342 only.
Power Cord Socket
100
220
120
240
Accepts the power cord. AC 100/120/220/240V ±10%, 50/60Hz
For power on sequence, see page 25.
GDM-834X Series User Manual
22
GETTING STARTED
Fuse Socket
100
220
120
240
Holds the main fuse:
100/120 VAC: 0.125AT 220/240 VAC: 0.063AT
For fuse replacement details, see page 145.
Calibration Port
CALIBRATION
USE ONLY
Reserved for calibration purposes. For service technicians only.
USB Device
Type B USB port. This port is used for remote control.
23
GDM-834X Series User Manual
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
Set Up
Tilting the Stand
24
Power Up
Steps
1. Ensure the correct line
voltage is lined up with the arrow on the fuse holder. If not, see page 145 to set the line voltage and fuse.
2. Connect the power
cord to the AC voltage input.
Note
Make sure the ground connector on the power cord is connected to a safety ground. This will influence the measurement accuracy.
3. Push to turn on the
main power switch on the front panel.
P
O
W
E
R
4. The display turns on and shows the last
function that was used before the power was reset.
GETTING STARTED
25
GDM-834X Series User Manual
Background
The following section will introduce to you how to access the basic functions on the DMM as well as how to navigate the menu system and the edit parameter values.
Using the Function keys
Any of the primary functions can be used by simply pressing the desired function key.
For example: To activate the DCV function, press the DCV key.
DCV
DCI
To activate a secondary function, first press the SHIFT key followed by the function key for the secondary function. For example: To activate DCI measurement, first press the SHIFT key. SHIFT will be highlighted on the display. Next, press the DCV function key. This will activate the DCI mode.
SHIFT
EXIT
→
DCV
DCI
How to Use the Instrument
26
GETTING STARTED
Navigating the Menu System
The menu system is navigated with the Up, Down, Left and Right arrow keys, the Auto/Enter key and the SHIFT/EXIT key.
SHIFT
EXIT
Auto
Enter
RANGE
RANGE
To enter the menu system, press the MENU key. See page 143 for the System Menu tree.
USB STO
MENU
Pressing the Left and Right arrow keys will
navigate to each of the menu items on the current menu level.
Pressing the Down key will go down to the
next level of the menu tree.
Conversely pressing the Up key will allow
you to go back to the previous menu level.
Pressing Down or Enter on the last item in
a menu tree will allow you to edit the settings or parameters for that particular item or setting.
Pressing the Exit key will allow you to exit
from the current settings and return to the previous menu tree level.
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GDM-834X Series User Manual
Editing a Setting or Parameter
When you access a menu or parameter setting, the Up, Down, Left and Right keys can be used again to edit the parameter as well.
Auto
Enter
RANGE
RANGE
If a setting or parameter is flashing, it
indicates that that particular parameter can be edited.
Pressing the Left or Right arrow key will
allow you to select a digit or character to edit.
Pressing the Up or Down keys will allow
you to edit the selected character.
28
OPERATION
Basic Measurement Overview ......................................... 31
Refresh Rate ............................................................... 31
Reading Indicator ....................................................... 31
Automatic/Manual Triggering ................................... 32
AC/DC Voltage Measurement ......................................... 33
Select the Voltage Range ........................................... 35
Voltage Conversion Table .......................................... 37
Crest Factor Table ...................................................... 38
AC/DC Current Measurement ......................................... 39
Select the Current Range ........................................... 41
Resistance Measurement ................................................ 43
Select the Resistance Range ...................................... 44
Diode Test ..................................................................... 45
Capacitance Measurement .............................................. 46
Select the Capacitance Range .................................... 47
Continuity Test ............................................................... 48
Set Continuity Threshold ........................................... 49
Continuity Beeper Settings ........................................ 50
Frequency/Period Measurement ..................................... 51
Frequency/Period Voltage Range Settings ................ 52
Temperature Measurement ............................................. 53
Set the Temperature Units......................................... 54
Select Thermocouple Type......................................... 55
OPERATION
29
GDM-834X Series User Manual
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 .................................................. 63
Measuring dBm/W .................................................... 63
Measure dB ................................................................ 65
Max/Min Measurement ................................................... 66
Relative Measurement ..................................................... 67
Hold Measurement ......................................................... 69
Compare Measurement ................................................... 70
Math Measurement ......................................................... 72
Math Measurement Overview ................................... 72
Measure MX+B .......................................................... 72
Measure 1/X ............................................................... 73
Measure Percentage .................................................. 74
30
OPERATION
Background
The refresh rate defines how frequently the 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.
For further details, please see the specifications.
Refresh rate (Reading/S)
Function
S M F
Continuity / Diode
10
20
40
DCV/DCI/R
5
10
40
ACV/ACI
5
10
40
Frequency / Period
1
10
76
Capacitance
2 2 2
Steps
1. Press the left or right arrow keys to change the
refresh rate.
2. The refresh rate will be
shown at the top of the display.
F ↔ M ↔ S
Note
The refresh rate cannot be set for capacitance measurement.
Basic Measurement Overview
Refresh Rate
31
GDM-834X Series User Manual
Overview
1. The reading indicator next to the 1st display
flashes according to the refresh rate setting.
V
Overview
By default, the GDM-8342/8341 automatically triggers according to the refresh rate. See the previous page for refresh rate setting details. The TRIG key is used to manually trigger acquisition when the trigger mode is set to EXT.
Manual Trigger
1. Press SHIFT+TRIG to toggle the trigger mode
to EXT.
2. Press the TRIG key to manually trigger each
measurement when in EXT trigger mode.
Note
Manual triggering is not supported for capacitance measurements.
Reading Indicator
Automatic/Manual Triggering
32
OPERATION
Set to ACV/DCV Measurement
1. Press the DCV or ACV key to measure DC or
AC voltage. For AC + DC voltage, press the ACV and DCV keys at the same time.
2. The mode will switch to AC, DC or AC+DC
mode immediately, as shown below.
AC & DC
indicator
Voltage
units
Measurement
range
V
SDCAC
Connection
Connect the test lead between the V and the COM terminal. The display updates the reading.
AC/DC Voltage Measurement
The GDM-8342/8341 can measure from 0 to 750VAC or 0 to 1000VDC, however the CATII measurement is only rated up to 600V.
33
GDM-834X Series User Manual
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
34
OPERATION
Auto Range
To turn the automatic range selection On/Off, press the AUTO key.
Manual Range
Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.
Selectable Voltage Ranges
Range
Resolution
Full scale
500mV
10μV
510.00mV
5V
0.1mV
5.1000V
50V
1mV
51.000V
500V
10mV
510.00V
750V (AC)
100mV
765.0V
1000V (DC)
100mV
1020.0V
Note
For further details, please see the specifications on page 149.
Note
DC voltages with AC components cannot be accurately measured if the DC+AC component exceeds the ADC dynamic range for the selected DC range. Any voltage exceeding the ADC dynamic range will be clipped at the upper/lower range limit. Under these conditions the range that is chosen with the Auto range function may be too small.
Select the Voltage Range
The voltage range can be set automatically or manually.
35
GDM-834X Series User Manual
For example:
A
+5V
0V
-5V
C D
B
E
DC 5V Range
A,B: Input exceeds the ADC dynamic range.
C,D: The DCV offset causes the input to exceed the upper ADC dynamic range.
E: The DCV offset causes the input to exceed the lower ADC dynamic range.
The DC voltage range should be manually selected when any of the following conditions are true:
When DCV measurement is used. When the signals being measured contain both
DC and AC components.
When the amplitude of the AC component in
the measured signal is higher or lower than the dynamic range of the range being currently selected by the auto-range function.
Maximum DCV Dynamic Range
Selected DCV Range
ADC Dynamic Range
DC 500mV
max±100mV
DC 5V
max±1V
DC 50V
max±10V
DC 500V
max±100V
DC 1000V
max±1000V
36
OPERATION
Waveform
Peak to Peak
AC (True RMS)
DC
Sine
PK-PK
2.828
1.000
0.000
Rectified Sine (full wave)
PK-PK
1.414
0.435
0.900
Rectified Sine (half wave)
PK-PK
2.000
0.771
0.636
Square
PK-PK
2.000
1.000
0.000
Rectified Square
PK-PK
1.414
0.707
0.707
Rectangular Pulse
PK-PK
X
Y
2.000
2K
K=
)2
( DD
D=X/Y
2D
D=X/Y
Triangle Sawtooth
PK-PK
3.464
1.000
0.000
Voltage Conversion Table
This table shows the relationship between an AC and DC reading for various waveforms.
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GDM-834X Series User Manual
Background
Crest factor is the ratio of the peak signal 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.
If the crest factor is more than 3.0, it usually indicates an abnormal waveform as seen from the below table.
Crest Factor Table
Waveform
Shape
Crest factor
Square wave
1.0
Sine wave
1.414
Triangle sawtooth
1.732
Mixed frequencies
1.414 ~ 2.0
SCR output 100% ~ 10%
1.414 ~ 3.0
White noise
3.0 ~ 4.0
AC Coupled pulse train
>3.0
Spike
>9.0
Crest Factor Table
38
OPERATION
Set to ACI/DCI Measurement
1. Press SHIFT → DCV or SHIFT → ACV to
measure DC or AC current, respectively.
For AC+DC current, press SHIFT followed by both the DCV and ACV key at the same time.
2. The mode will switch to AC, DC or AC+DC
mode immediately, as shown below.
A
SAC AUTO
AC & DC
indicator
Current
units
Measurement
range
DC
Connection
Connect the test lead between the 10A terminal and the COM terminal or DC/AC 0.5A terminal and the COM terminal, depending on the input current. For current ≤ 0.5A use the 0.5A terminal; For current up to 12A use the 10A terminal. The display updates the reading.
AC/DC Current Measurement
The GDM-834X series DMMs have two input 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 ~ 10A for both AC and DC current.
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GDM-834X Series User Manual
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Max 12A
Max 0.5A
40
OPERATION
Auto Range
To turn the automatic range selection On/Off, press the AUTO key.
Manual Range
Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.
Selectable Current Ranges
Range
Resolution
Full scale
500µA
10nA
510.00μA
5mA
100nA
5.1000mA
50mA
1μA
51.000mA
500mA
10μA
510.00mA
5A
100μA
5.1000A
10A
1mA
12.000A
Note
For further details, please see the specifications on page 149.
Note
DC currents with AC components cannot be accurately measured if the DC+AC component exceed the ADC dynamic range for the selected DC range. Any current exceeding the ADC dynamic range will be clipped at the upper/lower range limit. Under these conditions the range that is chosen with the Auto range function may be too small.
Select the Current Range
The current range can be set automatically or manually.
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GDM-834X Series User Manual
For example:
A
+5A
0V
-5A
C D
B
E
DC 5A Range
A,B: Input exceeds the ADC dynamic range.
C,D: The DCI offset causes the input to exceed the upper ADC dynamic range.
E: The DCI offset causes the input to exceed the lower ADC dynamic range.
The DC current range should be manually selected when the following conditions are true:
When DCI measurement is used. When the signals being measured contain both
DC and AC components.
When the amplitude of the AC component in
the measured signal is higher or lower than the dynamic range of the range being currently selected by the auto-range function.
Maximum DCI Dynamic Range
Selected DCV Range
ADC Dynamic Range
DC 500μA
max±0.1mA
DC 5mA
max±1mA
DC 50mA
max±10mA
DC 500mA
max±100mA
DC 5A
max±1A
DC 10A
max±10A
42
OPERATION
Set to Ω Measurement
1. Press the Ω/ key to activate resistance
measurement. Note: pressing the Ω/ key twice will activate continuity measurement instead.
2. The mode will switch to resistance mode
immediately, as shown below.
Display
W
S2WkAUTO
Resistance
indicator
Resistance
units
Measurement
range
Connection
The GDM-8342/8341 uses 2-wire resistance measurement. Connect the test leads between the VΩ terminal and the COM terminal.
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Resistance Measurement
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GDM-834X Series User Manual
Auto Range
To turn the automatic range selection On/Off, press the AUTO key.
Manual Range
Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.
Selectable Resistance Ranges
Range
Resolution
Full scale
500Ω
10mΩ
510.00Ω
5kΩ
100mΩ
50kΩ
1Ω
500kΩ
10Ω
5MΩ
100Ω
5.1000MΩ
50MΩ
1kΩ
51.000MΩ
Note
For further details, please see the specifications on page 152.
Select the Resistance Range
The resistance range can be set automatically or manually.
44
OPERATION
Set to Diode Measurement
1. Press the
/
key once to activate diode measurement. Note: pressing the
/
key twice will activate
the capacitance measurement instead.
2. The mode will switch to Diode mode
immediately, as shown below.
Display
V
S
Diode
state
Diode function
indicator
Connection
Connect the test lead between the VΩ terminal and COM terminal; Anode-V, Cathode-COM. The display updates the reading.
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Diode Test
The diode test checks the forward bias characteristics of a diode by running a constant forward bias current of approximately 0.83mA through the DUT.
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GDM-834X Series User Manual
Set to Diode Measurement
1. Press the
/
key twice to activate capacitance measurement. Note: pressing the
/
key once will activate
the diode measurement instead.
2. The mode will switch to capacitance mode
immediately, as shown below.
Display
Capacitance
indicator
Capacitance
units
Measurement
range
S
n F
Connection
Connect the test lead between the VΩ terminal and COM terminal; Positive-V, Negative-COM. The display updates the reading.
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Capacitance Measurement
The capacitance measurement function checks the capacitance of a component.
46
OPERATION
Auto Range
To turn the automatic range selection On/Off, press the AUTO key.
Manual Range
Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.
Selectable Capacitance Ranges
Range
Resolution
Full scale
5nF
1pF
5.100nF
50nF
10pF
51.00nF
500nF
100pF
510.0nF
5μF
1nF
5.100μF
50μF
10nF
51.00μF
Note
For further details, please see the specifications on page 152.
Note
The refresh rate settings and the EXT trigger cannot be used in the capacitance mode.
Select the Capacitance Range
The capacitance range can be set automatically or manually.
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GDM-834X Series User Manual
Procedure
1. Press the Ω/ key twice to activate continuity
testing.
2. The mode will switch to continuity testing
immediately, as shown below.
Display
W
S
Continuity
state
Continuity function
indicator
Connection
Connect the test lead between the VΩ terminal and COM terminal. The display updates the reading.
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Continuity Test
The continuity test checks that the resistance in the DUT is low enough to be considered continuous (of a conductive nature).
48
OPERATION
Range
Threshold
0 to 1000Ω (Default Threshold:10Ω)
Resolution
1Ω
Procedure
1. Press MENU.
2. Go to the MEAS menu on level 1
3. Go to the CONT menu on level 2
4. Set the continuity threshold level.
5. Press the Enter key to confirm the continuity
settings.
6. Press EXIT to exit the CONT setting menu.
Display
W
Continuity
setting
Continuity function
indicator
Set Continuity Threshold
The continuity threshold defines the maximum resistance allowed in the DUT when testing the continuity.
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GDM-834X Series User Manual
Range
PASS
Beeps when the continuity passes.
FAIL
Beeps when the continuity fails.
OFF
Beeper is turned off.
Procedure
1. Press MENU.
2. Go to the SYSTEM menu on level 1
3. Go to the BEEP menu on level 2
4. Set the BEEP setting to PASS, FAIL or OFF.
5. Press the AUTO/ENTER key to confirm the
beeper settings.
6. Press EXIT to exit the BEEP setting menu.
Display
Beep
setting
Beep menu
indicator
Continuity Beeper Settings
The beeper setting defines how the GDM-8342/8341 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.
50
OPERATION
Range
Frequency
10Hz~500kHz
Period
2.0μs ~100ms
Procedure
To measure frequency, press the Hz/P key once. FREQ will be displayed on the secondary display.
To measure the period, press the Hz/P key twice. PERIOD will be displayed on the secondary display.
Display
Hz
SAUTO
Measurement
Frequency
units
Measurement
mode
k
Connection
Connect the test lead between the VΩ terminal and the COM terminal. The display updates the reading.
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Frequency/Period Measurement
The GDM-8342/8341 can be used to measure the frequency or period of a signal.
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GDM-834X Series User Manual
Range
Voltage
500mV, 5V, 50V, 500V, 750V
Manual Range
1. When in the PERIOD or FREQ measurement
mode, press the 2ND key twice. This will allow the secondary display to show the voltage range.
2. Set the range with the Up and Down keys. The
AUTO indicator will turn off when a new range is selected.
3. Press the 2ND key twice more to switch the
secondary display back to the previous view.
Autorange
1. Press the Auto/Enter key.
2. AUTO will be displayed on the screen again.
Display
Hzk
AUTO
Autorange
indicator
Voltage range
setting
Note
The 2nd key is only used to toggle the view of the second display between the menu function (FREQ or PERIOD) and the voltage range. The voltage range can actually be set without switching to the 2ND display.
Frequency/Period Voltage Range Settings
The input voltage range for frequency/period measurements can be set to Auto range or to manual. By default, both the period and frequency voltage range are set to Auto.
52
OPERATION
Range
Thermocouple:
-200°C ~ +300°C
Procedure
To make temperature measurements, press SHIFT → Hz/P (TEMP).
The temperature mode appears showing the temperature on the primary display and the type of sensor on the secondary display.
Display
C
S
Measurement
Temp.
units
Sensor type
Connection
Connect the sensor lead between the VΩ terminal and the COM terminal. The display updates the reading.
Temperature Measurement
The GDM-8342 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 measurement is only supported on the GDM-8342.
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GDM-834X Series User Manual
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Range
Units
˚C, ˚F
Procedure
1. Press the MENU key.
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.
6. Press the EXIT key to exit from the temperature
menu.
Display
Temperature
unit setting
Unit menu
indicator
Set the Temperature Units
54
OPERATION
Thermocouple type and range
Type
Measurement Range
Resolution
J -200 to +300˚C
0.1 °C
K -200 to +300˚C
0.1 °C
T -200 to +300˚C
0.1 °C
Procedure
1. Press the MENU key.
2. Go to TEMP on level 1.
3. Go to SENSOR on level 2.
4. Select the thermocouple type (J, K, T).
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the temperature
menu.
Display
Thermocouple
type setting
Sensor menu
indicator
Select Thermocouple Type
The GDM-8342 accepts thermocouple inputs and calculates the temperature from the voltage difference of two dissimilar metals. Thermocouple type and reference junction temperature are also considered.
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GDM-834X Series User Manual
Range
SIM
0 ~ 50˚C (default: 23.00˚C)
Resolution
0.01˚C
Procedure
1. Press the MENU key.
2. Go to TEMP on level 1.
3. Go to SIM on level 2.
4. Set the SIM (simulated) reference junction
temperature.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the temperature
menu.
Display
Reference junction
temperature setting
SIM menu
indicator
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.
56
OPERATION
Supported Dual Measurement modes
Primary
Display
Secondary Display
ACV
DCV
ACI
DCI
Hz/P
Ω
ACV
● ● ● ● ●
X
DCV
● ● ●
●
X
X
ACI
● ● ● ● ●
X
DCI
● ● ●
●
X X Hz/P ● X ● X ● X
Ω
X X X X X
●
Dual Measurement Overview
The dual measurement mode allows you to use the 2nd 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. If the primary and secondary measurement modes have the same range, rate and rely on the same fundamental measurement, then a single measurement is taken for both displays; such as ACV and frequency/period measurements. If the primary and secondary displays use different measurement functions, ranges or rates, then separate measurements will be taken for each display. For example, ACV and DCV measurements.
Most of the basic measurement functions, except for resistance/continuity can be used in the dual measurement mode.
Supported dual measurement modes
The following table lists all the measurement functions that are supported with the dual measurement function.
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GDM-834X Series User Manual
Procedure
1. Choose one of the basic measurement functions
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.
2. To set a measurement mode for the second
display, press the 2ND key and then select the second measurement mode.
For example, press 2ND, SHIFT, ACV to select ACI measurement for the second display.
Display
2ND
AUTOAC
SAUTO
Indicators for 1st
measurement
2nd measurement
and unit
Indicators for 2nd
measurement
1st measurement
and unit
V
DC
Am
Using Dual Measurement Mode
58
OPERATION
Editing the Measurement Parameters
After the secondary measurement function has been activated, the rate, range and 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.
To edit measurement parameters in dual measurement mode, you must first set which display is the active display. The 2ND icon under the secondary display determines which display is the active display.
Procedure
1. Toggle whether the primary or secondary
display is the active display by pressing the 2ND key:
Primary display is the active display: 2ND is not visible on the display.
Secondary display is the active display: 2ND is visible on the display.
Note
Do not hold the 2ND key. This will turn the dual measurement mode off.
2. Edit the range, rate or measurement item for
the active display in the same way as for single measurement operation. See the Basic Measurement chapter for details (page 31).
Turn Off 2nd Measurement
To turn Off the 2nd measurement, press and hold the 2nd key for more than 1 second.
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GDM-834X Series User Manual
Connection
The diagrams below describe how to connect the DMM to measure a number of common dual measurement items.
Voltage and Frequency/Period measurement
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
60
Voltage/Frequency/Period and Current Measurement
CAT 600V
COM
250V
W
V
T0.5A
FUSE
INPUT
MAX
500Vpk
12A
MAX
750V
1000V
MAX
0.5A
MAX
Load
0~12A
0~0.5A
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.
The above measuring configuration is used to measure the voltage present on the resistance under test and the current through the resistance under test when using the DCI/DCV or ACI/ACV dual measurement function.
OPERATION
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GDM-834X Series User Manual
Advanced
Meas.
Basic Measurement
ACV/
DCV
ACI/
DCI
Ω
Hz/P
TEMP*
DIODE
CAP
dB ● X X X X X
X
dBm ● X X X X X
X
Max/Min
● ● ● ● ●
X
●
Relative
● ● ● ● ●
X
●
Hold
● ● ● ● ●
X
X
Compare
● ● ● ● ●
X
●
Math
● ● ● ● ●
X
X
*Temperature measurement is not supported by the GDM-8341.
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.
62
OPERATION
Overview
Using the ACV or DCV measurement results, the DMM calculates the dB or dBm value based on a reference resistance value in the following way:
dBm= 10 x log10 (1000 x Vreading2 / Rref)
dB= dBm – dBmref
W= Vreading2/Ref
Where: Vreading= Input Voltage, ACV or DCV; Rref= Reference resistance simulating an output load; dBmref= Reference dBm value
Procedure
1. Select ACV or DCV measurement. See page 33.
2. To measure dBm, press SHIFT → .
The primary display will show the dBm measurement while the secondary display shows the reference resistance.
dBm/dB/W Measurement
dBm/dB Calculation
Measuring dBm/W
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GDM-834X Series User Manual
Display
W
dB
SDC
m
dBm
measurement
Reference
resistance
Setting the Reference Resistance
To set the reference resistance, use the Up and Down arrow keys.
The selectable reference resistances are shown below.
Selectable reference resistances
2 4 8 16
50
75
93
110
124
125
135
150
250
300
500
600
800
900
1000
1200
8000
View the result in Watts
When the reference resistance is less than 50Ω, it is possible to calculate the power (in watts). If the reference resistance is equal to or greater than 50Ω, then this step can be ignored.
Press SHIFT →
again to view the result in
watts.
Display
W
dB
SDC
m
Power measurement
and unit
Reference resistance
W
Exit dBm Measurement
Press SHIFT →
again to exit the dBm measurement, or simply activate another measurement function.
64
OPERATION
Procedure
1. Select ACV or DCV measurement. See page 33.
2. Press SHIFT → Ω/ key to activate the dB
measurement mode.
The 1st display shows the dB reading the second display shows the voltage reading.
Display
dB
measurement
Voltage reading
dB
SDC
V
View the dBm Reference Value
To view the dBm reference value, press the 2ND key.
The Up and Down arrow keys can also be used to change the voltage range or the reading.
Exit dB Measurement
Press the SHIFT → Ω/ key again to exit the dB measurement, or simply activate another measurement function.
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.
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GDM-834X Series User Manual
Applicable measurements
The Max/Min function can be used with the following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP,
Procedure
For Max measurement, press the MX/MN key once.
For Min measurement, press the MX/MN key twice.
Display
MAXS
V
MAXAUTOAC
Basic meas.
function
Max/Min indicator
Measurement
range
View Max/Min Value
Press the 2ND key to view the Max or Min value.
Display
V
MAXS
MAXAUTOAC
Max/Min
reading
Max/Min
mode
Deactivate Max/Min Measurement
Hold the MX/MN key for two seconds to deactivate, or simply activate another measurement function.
Max/Min Measurement
Maximum and Minimum measurement function stores the highest (maximum) or lowest (minimum) reading and shows it on the 1st display when the 2ND key is pressed.
66
OPERATION
Applicable measurements
The relative function can be used with the following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP,
Procedure
Press the REL key. The measurement reading at that instant becomes the reference value.
Display
V
RELSAC
Relative
value
Range
View Relative Reference Value
Press the 2ND key to view the relative reference value at full scale.
Display
V
Relative
reference value
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 exit.
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GDM-834X Series User Manual
Manually Set the Relative Reference Value
1. To manually set the relative reference value,
press SHIFT → REL.
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.
Use the Up and Down arrow keys to edit the selected digit or to place the position of the decimal point.
V
3. Press the Enter key to confirm, alternatively
press Exit to cancel setting the relative reference value.
Display
V
Relative
value setting
REL setting
mode
Deactivate Relative Measurement
Press the REL key again to deactivate the Relative measurement mode, or simply activate another measurement function.
68
OPERATION
Applicable measurements
The hold function can be used with the following basic measurement functions:
ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP
Procedure
1. Press the HOLD key.
2. The measurement reading appears on the
primary display and the hold threshold on the secondary display.
Display
V
HOLDSAC
Measurement
reading
Hold
threshold
Set the Hold Threshold
Use the Up and Down arrow keys to select a hold threshold level, as a percentage.
Range
0.01%, 0.1%, 1%, 10%
Deactivate Hold Measurement
Press the HOLD key for 2 seconds to deactivate the hold measurement, or simply activate another measurement function.
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).
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GDM-834X Series User Manual
Applicable measurements
The compare function can be used with the following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP,
Procedure
1. Press SHIFT → HOLD.
2. The high limit setting appears.
Use the Left and Right arrow keys to navigate to the digit to be edited, or to select the decimal point.
Use the Up and Down arrow keys to edit the selected digit, or to place the position of the decimal point.
V
3. Press the Enter key to save the high limit setting
and automatically go on to the low limit setting.
4. Enter the low limit setting in the same fashion
as the high setting.
5. Press the Enter key to confirm the low limit
settings.
6. The compare measurement results will appear
immediately:
If the current measurement reading is between
Compare Measurement
Compare measurement checks to see if the measurement data stays between a specified upper (high) and lower (low) limit.
70
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
V
SAC
COMP
Measurement
reading
Compare
result
Deactivate Compare Measurement
Press SHIFT → HOLD to deactivate compare measurements, or simply activate another measurement function.
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GDM-834X Series User Manual
Applicable Measurements
The math function can be used with the following basic measurement functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP
Overview of Math Functions
MX+B
Multiplies the reading (X) by the factor (M) and adds/subtracts offset (B).
1/X
Inverse. Divides 1 by the reading (X).
Percentage
Runs the following equation:
100%
Reference
Reference)-(ReadingX
x
Procedure
1. Press SHIFT → MX/MN to enter the MATH
menu.
The MX+B setting appears. The M factor will be flashing, indicating that the M factor is to be set.
2. Use the Left and Right arrow keys to navigate
to the digit to be edited or to select the decimal point.
Use the Up and Down arrow keys to edit the selected digit or to place the position of the
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.
Measure MX+B
72
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.
Display
MX+B meausurement
reading
MX+B math
indicator
SDCVAUTO
MATH
m
Deactivate Math Measurement
Press SHIFT → MX/MN to deactivate the MATH function, or simply activate another measurement function.
Procedure
1. Press SHIFT → MX/MN to enter the MATH
menu.
The MX+B setting appears.
2. Press the Down key twice to skip past MX+B
settings and go to the 1/X settings.
1/X will be flashing in the secondary display.
Measure 1/X
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GDM-834X Series User Manual
3. Press Enter to activate the 1/X math function.
The results begin immediately.
Display
SAC
V
SAUTO
MATH
1/X
measurement
1/X math
indicator
Deactivate Math Measurement
Press the SHIFT → MX/MN to deactivate the MATH function, or simply activate another measurement function.
Procedure
1. Press SHIFT → MX/MN to enter the MATH
menu.
2. The MX+B setting appears. Press the Up key to
skip past MX+B settings and go to the REF% settings.
REF% will be flashing in the secondary display.
3. Use the Left and Right arrow keys to navigate
to the digit to be edited or to select the decimal point.
Use the Up and Down arrow keys to edit the selected digit or to place the position of the decimal point.
Measure Percentage
74
OPERATION
4. Press Enter to confirm the REF% setting and to
begin the Percentage measurement.
Display
SDCVAUTO
MATH
Calculated percentage
meausurement
% function
indicator
Deactivate Math Measurement
Press SHIFT → MX/MN to deactivate the MATH function, or simply activate another measurement function.
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GDM-834X Series User Manual
View Serial Number ........................................................ 77
View Version Number ...................................................... 77
Brightness Settings ......................................................... 78
Input Resistance Settings ................................................ 79
Frequency/Period Input Jack Settings ............................... 80
Compatibility Settings ..................................................... 81
Changing the Compatibility Setting .......................... 81
Restore Factory Default Settings ...................................... 82
SYSTEM/DISPLAY
CONFIGURATION
76
SYSTEM/DISPLAY CONFIGURATION
Procedure
1. Press the MENU key.
2. Go to SYSTEM on level 1.
3. Go to S/N on level 2.
4. The serial number will be displayed across both
the primary and secondary display.
Display
Exit
Press the EXIT key twice to go back to the measurement screen.
Procedure
1. Press the MENU key.
2. Go to SYSTEM on level 1.
3. Go to VER on level 2.
4. The firmware version number will be displayed
in the secondary display.
5. Press Exit to exit from the version menu.
Display
Note
Firmware updates can only be performed by a GW Instek service technician. For details, please contact the GW Instek Service Center or visit the GW Instek website at www.gwinstek.com.
View Serial Number
View Version Number
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GDM-834X Series User Manual
Range
Brightness
1 (dim) ~ 5 (bright)
Procedure
1. Press the MENU key.
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).
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the brightness
settings.
Display
Brightness setting
Brightness Settings
The display has 5 settable brightness levels.
78
SYSTEM/DISPLAY CONFIGURATION
Range
Input resistance
10MΩ, 10GΩ
Default
10MΩ
Procedure
1. Press the MENU key.
2. Go to MEAS on level 1.
3. Go to INPUT R on level 2.
4. Set the input resistance to 10MΩ or 10GΩ
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the input
resistance menu.
Display
Input resistance
setting
Input Resistance Settings
The 500mV and 5V DC voltage ranges can be set to an input
resistance of 10MΩ or 10GΩ. This setting is only applicable for DC
voltage.
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GDM-834X Series User Manual
Range
Injack
VOLT, 500mA, 10A
Default
VOLT
Procedure
1. Press the MENU key.
2. Go to MEAS on level 1.
3. Go to INJACK on level 2.
4. Set the INJACK setting to either VOLT, 500mA
or 10A.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the INJACK
menu.
Display
INJACK setting
Frequency/Period Input Jack Settings
The INJACK settings set which input terminal is used for frequency or period measurements.
80
SYSTEM/DISPLAY CONFIGURATION
Range
LANG
NORM, COMP
Procedure
1. Press the MENU key.
2. Go to SYSTEM on level 1.
3. Go to LANG on level 2.
4. Set the LANG setting to either NORM (normal
mode) or COMP (compatibility mode).
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the LANG
menu.
Display
LANG setting
Compatibility Settings
Changing the Compatibility Setting
The GDM-8341/8342 can be set to a special compatibility mode that will allow the unit to emulate the SCPI command syntax of the GDM-8246 when in remote control mode. For example, this feature can allow programs that were originally written for the GDM-8246 to run on the GDM-8342/8341 with little modification.
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GDM-834X Series User Manual
Range
Factory DEF
YES, NO
Procedure
1. Press the MENU key.
2. Go to SYSTEM on level 1.
3. Go to FACTORY on level 2.
4. Set the (FACTORY) DEF setting to YES or NO.
Choosing YES will restore the factory default settings.
5. Press the Enter key to confirm and to restore
the factory default settings immediately.
Display
Factory default setting
Restore Factory Default Settings
The factory default settings can be restored at anytime from the System menu. Please see the Appendix on page 144 for a list of the factory default settings.
82
USB STORE
USB Store Overview ....................................................... 84
Supported USB Sticks: ............................................... 84
CSV Format ................................................................ 84
Filename Format ........................................................ 85
Operator Mode .......................................................... 86
Long Record Mode ..................................................... 88
View the Store Function Status ................................. 89
Set the Starting File Name
(Available only in Advance Mode ) ............................ 91
Save Count (Available only in Advance Mode) ......... 91
Save to an Existing File
(Available only in Advance Mode) ............................. 92
Time Mode (Available only in Advance Mode) ......... 93
Timer .......................................................................... 93
Date ............................................................................ 95
Save to USB ................................................................ 96
Save to USB (Simple Mode) .................................. 96
Save to USB (Advance Mode) ............................... 97
Note About Deleting Files or Directories on the
USB Stick .................................................................... 99
USB STORE
The GDM-8342 is able to save/log measurement results to a USB stick.
Please note that this function is not available for the GDM-8341, however similar functionality is possible on a PC via remote control using the Excel Add-In, GDM-834x Excel Addins. See the GDM-834X Series Excel Add-In manual for details.
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GDM-834X Series User Manual
Note
Flash disks which need to use card adaptors are not recommended to be used in this application.
Overview
The GDM-8342 saves readings as a CSV file (comma separated values) that can be easily read using spreadsheet programs such as Microsoft Excel. Each CSV file saves the following information.
Parameters
Time (dd)
The elapsed number of days since the start of the readings.
Time (hh:mm:ss)
The elapsed time since the start of the readings, in hours:minutes:seconds formatting.
1st Value
The reading on the primary display.
USB Store Overview
The GDM-8342 is able to store measurement results to a USB stick. The USB storage function also has comprehensive save options that allow you to create a save file name, allow you to save up to a specified number of reading counts as well as the option to continue saving to a previously stored file instead of saving to a new file.
Supported USB Sticks:
USB Disk Type: Flash Disk Only
FAT Format: Fat16 or Fat32(Recommended)
Max memory size: 32GB
Max record count in a recording: 5,000,000 records
CSV Format
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USB STORE
1st Unit
The units for the reading on the primary display.
2nd Value
The reading on the secondary display.
2nd Unit
The units for the reading on the secondary display.
Count
Counts the number of readings each time the measurement is started. The count is restarted each time measurement is restarted. When a measurement is started/restarted, the first count is marked as #START#, the last as #END#.
Note
Records the accumulative number of readings that are recorded in that file, up to the maximum of 50,000.
Example:
Time(dd)
Time (hh:mm:ss)
1st Value
1st Unit
2nd Value
2nd Unit
Count
Note 0
0:00:05
0.00E+00
V DC
--
--
#START#
00001#
0
0:00:06
0.00E+00
V DC
--
-- 2 00002#
0
0:00:06
0.00E+00
V DC
--
--
#END#
00003#
Overview
When files are saved to USB they are saved as a number starting from GW000\GW000-XX.CSV and are automatically incremented for each new CSV file*. For example: the first file will be named, GW000\GW000-XX.CSV, the next GW001\GW001-XX.CSV and so on.
Note that the suffix, XX, represents a number from 00 to 99. Each time the system logs more than 50000 readings in total*, a new file is generated and the suffix is incremented. For
Filename Format
85
example, if 102000 counts are logged, 3 files will be created: GW000\GW000-00.CSV (counts 1~50000), GW000\GW000-01.CSV (counts 50001~100000), and GW000\GW000-02.CSV (counts 100001 ~ 102000).
Note
*Please note that automatic file name generation only occurs if the FILE setting is set to NEW FILE. See page 92 for details.
**Please note that the suffix will only be incremented if the total number of readings exceeds 50000. To be able to exceed 50000 readings, either the FILE setting should be set to CONTINU (continuous) or the Count setting should be set to CONTINU (continuous). See page 91 and 92 for details.
Operator Mode
Overview
In the operator mode, you can choose to operate in Simple mode or in Advance mode, where various parameters can be designated by the user.
Simple Mode
This mode is the easiest operation mode and is almost setting free. It is the default operating mode. After entering this mode, the system will
set the ‘Existing File’ setting to ‘New File,’ ‘Count’ to ‘Continu,’ and ‘Time Mode’ to ‘Restart’ by default. The system will then start
to seek for the first available file name (e.g. The first file name will usually start from GW000, if GW000 doesn’t already exist). If GW000 and GW001 exist already, then GW002 would be the next available filename.
GDM-834X Series User Manual
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USB STORE
Advance Mode
Users can make detailed settings by themselves in this mode. Advance mode is more flexible, so it is comparatively more complex and only recommended for advanced users. The following settings are available in this mode: “Existing File”, “File Name”, “Count”, “Time Mode”, “Time Setup” and “Date Setup.”
Note that the settings that are available for the Advance mode are automatically available when you activate the USB Store function in the Advance mode. See page 97.
Procedure
1. Press the MENU key.
2. Go to USBSTO on level 1.
3. Go to MODE on level 2.
4. Set MODE to SIMPLE or ADVANCE.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the MODE
menu.
Display
Operator mode
setting
Operator mode
menu indicator
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GDM-834X Series User Manual
Overview
If users need long-term data records, the Long Record Mode can be used to log test data for a long period of time. In this mode, the Rate is set by the system to the slow rate and the refresh rate is set to 1 data refresh per second (excluding dual measurement, ACI+DCI and ACV+DCV modes).
Normal
The Normal setting is the regular record mode. The longest recordable time depends on the refresh rate that is chosen; the longest recordable time (in seconds) equals 5,000,000/refresh rate.
Long
In the long record mode, a fixed record speed of one record per second will be logged into the log file; the longest recordable time is 5,000,000 seconds.
Procedure
1. Press the MENU key.
2. Go to USBSTO on level 1.
3. Go to RECORD on level 2.
4. Set RECORD to NORMAL or LONG.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the MODE
menu.
Long Record Mode
88
USB STORE
Display
Operator mode
setting
Operator mode menu indicator
Overview
The USB Status menu can be used to check the status of the USB Store function. This function will allow you to see if the save operation has completed or check the elapsed time or the current reading count.
USB Store Status Items
ELTIME
Displays the elapsed time from when the USB store function was started. (Format: HHH:MM:SS)
COUNT
Displays the number of readings that have been logged for the current operation.
STATUS
Displays the USB Store function status. These statuses include:
1. START indicates that the function has been started
2. STOP indicates that the function has been stopped.
3. F-FULL indicates that the current log file is full.
4. D-FULL indicates that the USB disk currently being used is full.
5. ERROR indicates errors for unknown reasons.
View the Store Function Status
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GDM-834X Series User Manual
S-FILE
Shows the filename of the first log file of the present record.
E-FILE
Shows the filename of the last log file of the present record.
Procedure
1. Insert a USB stick and start the USB Store
function as described on page 96 or 97.
2. To check the status of a save operation press
SHIFT → 2ND.
3. The USB Status menu will appear on the
display. The elapsed time will be displayed when you enter this menu.
4. Press the Left or Right arrow keys to switch
between the ELTIME, COUNT, STATUS, S­FILE and E_FILE displays.
5. Press SHIFT → 2ND again to exit from the USB
status menu.
Display
Elapsed time, Count
or USB store status
Status item
2ND
FDC
USBSTO
90
USB STORE
Overview
The GDM-8342 will allow you to set the value of the starting file name instead of the default GW000-XX.CSV.
Note that the suffix, XX, cannot be edited.
This setting will appear automatically after the USB Store function has been started in Advance mode, see page 97 for details.
Range
GW000-XX.CSV to GW999­XX.CSV
Display
File name
number setting
Name menu
indicator
Range
Count
CONTINU, 00002~50000
Default
10
Overview
The COUNT function sets how many readings to perform each time the USB STO function is used. By default the COUNT setting is set to 10. When this function is used, the DMM will automatically return to the ready status when the specified number of readings have been logged. Note, however that the CONTINU (continuous) setting will continuously log data
Set the Starting File Name (Available only in Advance Mode )
Save Count (Available only in Advance Mode)
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GDM-834X Series User Manual
until the USB store function is turned off.
This setting will appear automatically after the USB Store function has been started in Advance mode, see page 97 for details.
Note
When set to CONTINU, the actual number of reading counts cannot exceed 5000000 (50000 readings X100).
Display
Count setting
Count menu
indicator
Range
FILE:
CONTINU, NEWFILE
Default
NEWFILE
Overview
By default a new file is created each time the USB STO function is used. The FILE menu gives you the option to continue saving to the previous file rather than creating a new file each time the USB STO function is used.
This setting will appear automatically after the USB Store function has been started in Advance mode, see page 97 for details.
Display
File menu
setting
File menu
indicator
Save to an Existing File (Available only in Advance Mode)
92
USB STORE
Range
TIME
CURRENT, RESTART
Default
RESTART
Overview
The Time Mode setting designates how the readings are time-stamped when saved to a CSV file.
The CURRENT setting time stamps each reading from the time when the DMM was first turned on.
The RESTART setting restarts the time stamp time to 0 each time the USB STO function is used.
This setting will appear automatically after the USB Store function has been started in Advance mode, see page 97 for details.
Display
Tmode menu
setting
Tmode menu
indicator
Range
TIMER
00:00:00 ~ 23:59:59 (hours:minutes:seconds)
Default
Elapsed time from when the unit was switched on.
Time Mode (Available only in Advance Mode)
Timer
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GDM-834X Series User Manual
Overview
The timer setting sets the “current” timer time
that is used to time stamp readings when saving to USB. By default the timer time is the elapsed time from when the unit was turned on. If the timer time ticks over 23:59:59, the timer will revert back to 00:00:00 and the time stamp
will include a “day” count for each time this occurs. Note, however, the “day” count cannot
be set in the timer settings.
Note
The GDM-834X uses volatile RAM and does not have a CMOS backup battery to save the TIMER settings when the power is turned off. When the power is reset, the TIMER setting will be reset to 00:00:00.
Procedure
1. Press the MENU key.
2. Go to USBSTO on level 1.
3. Go to TIMER on level 2.
4. Set TIMER time between 00:00:00 and 23:59:59.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the TIMER
menu.
Display
Timer setting
Timer menu
indicator
94
Date
Range
Date
13.03.01 ~ 99:12:31 (Year:Month:Day)
Default
13.03.01
Overview
The date setting sets the date-stamp for any CSV files that are saved.
Note
The GDM-8342 has flash memory to store the date settings. The date that is set by the user will be restored each time the power is turned on. The GDM-8342 will not update the date setting automatically, this must be done manually by the user.
Procedure
1. Press the MENU key.
2. Go to USBSTO on level 1.
3. Go to DATE on level 2.
4. Set the DATE. The format for the date is
Year:Month:Day.
5. Press the Enter key to confirm.
6. Press the EXIT key to exit from the DATE
menu.
Display
Date setting
Date menu
indicator
USB STORE
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GDM-834X Series User Manual
Overview
The USB STO option allows the GDM-8342 to store each measurement reading to a USB stick. The USB Store function varies according to whether the operator mode is set to Simple or Advance.
Note
When the GDM-8342 starts to save records to USB, all buttons except for the SHIFT, MENU, 2ND and left and right arrow keys will be locked and disabled. Remote control will also be disabled; the GDM-8342 will stop receiving or transmitting any commands after it starts to save records to USB.
Overview
The procedure below describes the save operation when the Mode is set to Simple.
Procedure
1. Insert a USB stick into the USB Host port on the
front panel.
2. If the USB stick is recognized by the DMM, the
USB STO icon will be lit. This indicates that the DMM is ready to save files to the USB stick.
3. Press SHIFT → MENU.
The USB STO icon will flash slowly, indicating the DMM is saving to USB.
4. To stop saving to USB, press SHIFT → MENU
again.
When the save operation has stopped, the USB STO icon will stop flashing and will remain lit.
Save to USB
Save to USB (Simple Mode)
96
USB STORE
5. The USB stick can now be removed or another
save operation can be performed.
WARNING
Do not remove the USB stick while the DMM is saving to the USB drive.
Note
The USB STO icon will flash at a faster rate (~5 times/second) if there is no more space left on the USB stick or if the automatically-incremented filename suffix, XX, has reached its maximum value, 99, and cannot be increased further.
Display
V
SDC
Recorded
Measurement
USB STO
icon
USBSTO
Overview
The procedure below describes the save operation when the Mode is set to Advance.
Procedure
1. Insert a USB stick into the USB Host port on the
front panel.
2. If the USB stick is recognized by the DMM, the
USB STO icon will be lit. This indicates that the DMM is ready to save files to the USB stick.
3. Press SHIFT → MENU.
4. Each Advance mode setting will now appear
one after the other. Set each option and press the Enter key to continue to the next option.
The following options will appear in order:
Save to USB (Advance Mode)
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GDM-834X Series User Manual
FILE (Existing File, see page 92) NAME (File Name, see page 91) COUNT (Count, see page 91) TMODE (Time Mode, see page 93) TIMER (Time Setup, see page 93) DATE (Date Setup, see page 95)
5. After the DATE option is set, the DMM will
begin logging data.
The USB STO icon will flash slowly, indicating the DMM is saving to USB.
6. To stop saving to USB, press SHIFT → MENU
again.
When the save operation has stopped, the USB STO icon will stop flashing and will remain lit.
7. The USB stick can now be removed or another
save option can be performed.
WARNING
Do not remove the USB stick while the DMM is saving to the USB drive.
Note
The USB STO icon will flash at a faster rate (~5 times/second) if there is no more space left on the USB stick or if the automatically-incremented filename suffix, XX, has reached its maximum value, 99, and cannot be increased further.
Display
V
SDC
Recorded
Measurement
USB STO
icon
USBSTO
98
USB STORE
Note
If you find the need to delete files or directories that have already been saved to the USB stick, please adhere to the following suggestions to prevent unexpected results when logging data.
Overview
As the system will look for the last GWXXX directory and last log file (GWXXX-XX.CSV) in that directory when saving log files, it is imperative that the file directory structure and the files within the directories remain continuous or files may be stored to the wrong directory or data may be added to the wrong log file.
Suggestions When Deleting Directories or Log Files
1. Only delete the last directories, do not delete
directories before the last remaining directory.
For example the following directories are on the USB stick: GW000, GW001, GW002, GW003, GW004, GW005
Recommended: Delete the last directories: GW000, GW001, GW002, GW003, GW004, GW005
Not recommended: Deleting any directories before the last directory: GW000, GW001, GW002, GW003, GW004, GW005
2. Only delete the last log files, do not delete any
log files before the last remaining log file.
For example the following log files are in a directory: GW000-00.CSV, GW000-01.CSV,
Note About Deleting Files or Directories on the USB Stick
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GDM-834X Series User Manual
GW000-02.CSV
Recommended: Deleting only the last files or all the files from a directory: GW000-00.CSV, GW000-01.CSV, GW000-
02.CSV
OR
GW000-00.CSV, GW000-01.CSV, GW000-
02.CSV
Not recommended: Deleting any file before the last file. GW000-00.CSV, GW000-01.CSV, GW000-
02.CSV
100
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