RIGOL DM3068 User Manual
RIGOL
User’s Guide
DM3068 Digital Multimeter
Feb. 2014
RIGOL Technologie s, Inc.
RIGOL
I
Guaranty and Declaration
Copyright
© 2010 RIGOL Technologies, Inc. All Rights Reserved.
Trademark Information
RIGOL is a registe red trade mark of RIGOL Technologies, Inc.
Publication Number
UGC06105-1110
Notices
RIGOL products are protected by patent law in and outside of P.R.C.
RIGOL reserves the right to modify or change parts of or all the
specifications and pricing policies at company’ s sole decision.
Information in this publication replaces all previously corresponding material.
RIGOL shall not be liable for losses caused by either incidental or
consequential in connection with the furnishing, use or performance of this
manual as well as any information contained.
Any part of this doc u ment is forbidden to cop y or photocopy or rearrang e
without prior written approval of RIGOL.
Product Certification
RIGOL guara nte es t his product conforms t o t he national and indust rial s tandards
in China as well as the ISO9001:2008 standard and the ISO1400 1:2 004 standard.
Other international standard conformance certification is in progress.
Contact Us
If you have any problem or requirement when using our products or this manual,
please contact RIGOL Technologies, Inc.
E-mail: service@rigol.com
Website: www.rigol.com
User’s Guide for DM3068
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II
Safety Requirement
General Safety Summary
Please review the following safety precautions carefully before putting the
instrument into operation so as to avoid any personal injuries or damages to the
instrument and any product connected to it. To prevent potential hazards, please
use the instrument only specified by this manual.
Use Proper Power Cord.
Only the power cord designed for the instrument and authorized by local country
could be used.
Ground The Instrument.
The instrument is grounded through the Protective Earth lead of the power cord.
To avoid elect ric shock, it is essential to connect the earth terminal of power cord
to the Protective Earth terminal before any inputs or outputs.
Observe All Terminal Ratings.
To avoid fire or shock hazard, observe all ratings and markers on the instrument
and check your manual for more information about ratings before connecting.
Use Proper Overvoltage Protection.
Make sure that n o ove rvol tage (such as that ca used by a thun derstorm ) can re ach
the product, or else the operator might expose to danger of electrical shock.
Do Not Operate Without Covers.
Do not operate the instrument with covers or panels removed.
Use Proper Fuse.
Please use the specified fuses.
Avoid Circuit or Wire Exposure.
Do not touch exposed junctions and components when the unit is powered.
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Do Not Operate With Suspected Failures.
If you suspect damage occurs to the instrument, have it inspected by qualified
service personnel before further oper at ions. Any maintenance, adjustment or
replacement especially to circuits or accessories must be performed by RIGOL
authorized personnel.
Keep Well Ventilation.
Inadequate ventilation may cause increasing of temperature or damages to the
device. So please keep well ventilated and inspect the intake and fan regularly.
Do Not Operate in Wet Conditions.
In order to avoid short circuiting to the interior of the device or electric shock,
please do not operate in a humid environment.
Do Not Operate in an Explosive Atmosphere.
In order to avoid damages to the device or personal injuries, it is important to
operate the device away from an explosive atmosphere.
Keep Product Surfaces Clean and Dry.
To avoid the influence of dust and/or moisture in air, please keep the surface of
device clean and dry.
Electrostatic Prevention.
Operate in an electrostatic discharge protective area environ ment to avoid
damages induced by static discharges. Alwa ys g round both the internal and
external conductors of the cable to release static before connecting.
Handling Safety.
Please handle with ca re durin g tr a nsportation t o a void dama ges to keys, knob and
interfaces as well as other parts on the panels.
The disturbance tests of all models conform to the P/F values of A based
on the standard of EN 61 326: 19 97+A 1+A2+ A3 ins tead o f P/F va lue s of
B.
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Input Terminal Protection Limit.
The protection limit applies to input terminals:
1． Main input (HI and LO) terminals.
HI and LO terminals are used for Voltage, Resistance, Capacitance,
Continuity, Frequency and Diodes measurements and should be used under
the following two conditions:
1) HI-LO protection limit: at most 1000 VDC or 750 VAC, this is also the
maximum measurable voltage. The limit can be expressed as 1000 Vpk.
2) LO-ground protection limit: at most 500 Vpk (relative) is allowed to float
at LO terminal with safety.
Since the HI terminal holds a maxi mum prote ction of 1000 Vpk relative to the
ground, the sum of the “float” and measured voltages cannot exceed 1000
Vpk.
2． Sampling (HI Sense and LO Sense/200 mA) terminals.
HI Sense and LO Sense/200 mA terminals are used for 4-Wire R esis tance
measurement and should be used under the following two conditions:
1) HI Sense-LO Sense/200 mA protection limit: 200 Vpk.
2) LO Sense/200 mA-LO protection limits: 0.5 Vpk. The current input fuse
on the rear panel provides the current passing through LO Sense/200
mA up to 500 mA protection.
3． Current input (10 A and Sense/200 mA) terminals.
10 A and LO terminals are used for current measurements of 2 A and 10 A.
The maximum current which goes through the 10 A terminal is limited to 10
A by the internal fuse. LO Sense/200 mA and LO terminals are used for
current measurements ranging from 200 µA to 200 mA. The max imum
current which go through the LO Sense/200 mA terminal is limited to 500
mA by the internal fuse.
Note:
In order to prevent the fuse from blowing out and protect the
multimeter, please use the current input terminals according to the
following requirements:
1) Do not connect the 10 A and LO Sense/200 mA input terminals into
the current measuring circuit at the same time.
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2) Only use 10 A and LO terminals for measurements when the measured
current AC+DC RMS value goes within 200 mA and 10 A.
3) Select a proper current input terminal according to the estimated current
magnitude before connect the multimeter to AC supplies if you want to
use current measurement.
4) The current into 10 A cannot exceed 13.5 A, otherwise it will blow out
the internal fuse; while the current into the LO Sense/200 mA terminal
cannot exceed 650 mA, otherwise the current fuse from the rear panel
may be blown out.
IEC II Overvoltage Protection.
In order to prevent electric shock, DM3068 provide s ov e rv o ltage protection for
line-voltage mains connections meeting both of the followin g conditions:
1． The HI and LO input terminals are connected to the mains under
Measurement Category II conditions, defined below.
2． The mains are limited to a maximum line voltage of 300 VAC.
Warning: IEC II includes electrical devices connected to mains at an outlet on a
branch circuit. Such devices include most small appliances, test equipments and
other devices that inserted into a br anch soc ket.
DM3068 may be used to make measurements with the HI and LO inputs connected
to mains in such devices (up to 300 VAC), or to the branch socket itself. However,
DM3068 may be used with its HI and LO inputs connected to mains from neither
permanently installed electrical device such as a main circuit-breaker panel,
sub-panel disconnected box nor wired motors. Such devices and circuits are readily
to beyond the protection from DM3068.
Note: voltages above 300 VAC may be measured only in circuits that are isolated
from mains. However, a transient overvoltage is also present in such circuits.
DM3068 was designed to safely withstand occasional transient overvoltage up to
2500 Vpk. Do not use this device to measure circuits whose transient overvoltage
may exceed this level.
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VI
Warning stateme nts indicate the con ditions or practice s that could result i n
CAUTION
Caution statements indicate t he conditions or pr a ctices that c ould result i n
WARNING
indicates a potential dama ge to the inst rument or ot her property mi ght
Hazardous
Safety
Protective
Chassis
Test
Safety Terms and Symbols
Terms in this Ma nual. These terms may appear in this manual:
WARNING
injury or loss of life.
damage to this product or other property.
CAT I (1000V)
IEC Measurement Category I. The maximum voltage can be measured by
HI-LO terminal is 1000 Vpk.
CAT II (300V)
IEC Measurement Category II. Inputs may be connected to mains (up to
300 VAC) in th e cas e of over voltage in Category II.
Terms on the Product. These terms may appear on the product:
DANGER
CAUTION
Symbols on the Product. These symbols may appear on the product:
indicates an injury or hazard may immediately happen.
indicates an injury or hazard may be accessible potentially.
occur.
Voltage
Warning
Earth
Terminal
Ground
Ground
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VII
To avoid damages to the instrument, do not expose them to liquids which
General Care and Cleaning
General Care:
Do not store or leave the instrument in where the instrument will be exposed to
direct sunlight for long periods of time.
Cleaning:
Clean the instrument regularly according to its operating conditions. To clean the
exterior surface, perform the following steps:
1. Disconnect the instrument from all power sources.
2. Clean the loose dust on the outside of the instrument with a lint- free cl ot h
(with a mild detergent and water). When clean the LCD, take care to avoid
scarifying it.
CAUTION
are corrosive.
WARNING
To avoid injury resulting from short circuit, make sure the instrument is
completely dry before reconnecting into a power sour ce.
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VIII
Environmental Consideratio ns
The following symbol indicates that this product complies with the applicable
European Union requirements according to Directive s 2002/96/EC on waste ele ctrical
and electronic equipment (WEEE) and batteries.
Product End-of-Life Handling
The equipment may contain substances that could b e ha rmful t o the envi ronm ent o r
human health. In order to avoid release of such substances into the environment and
harm to human health, we encourage you to recycle this product in an appropriate
system that will ensure that most of the materials are reused or recycled
appropriately. Please contact your local authorities for disposal or recycling
information.
User’s Guide for DM3068
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IX
DM3068 Overview
DM3068 is a 6½ digits , dual display digital multimeter. It is a perfect combination
of basic measurement functions, various math operations as well as any sensor
measurement and can fulfill users’ requirements for high precision, various
functions and auto measurement.
DM3068 provides high-resolution 256 x 64 monochrome LCD, easy-to-use keypad
layout and key backlight as well as operation prompts. It supports RS232, USB,
LAN and GPIB interfaces, USB storage device storage and remote control (web and
SCPI command).
Main Features:
Real 6½ digits reading resolution.
Minimum integration time: 0.006 PLC.
Dual display: synchronously display two kinds of characteristics of the same
signal.
Switch between “Normal” and “Preset” operation modes. The “Preset” mode
can quickly recall the preset configurations.
DC voltage measurement range: -1050 V to 1050 V.
DC current measurement range: -10.5 A to 10.5 A.
AC voltage measurement range: True-RMS, 0 V to 787.5 V.
AC current measurement range: True-RMS, 0 A to 10.5 A.
Resistance measurement range: 0 Ω to 110 M Ω; support 2-wire (2 WR) and
4-wire (4WR) resistance measurements.
Capacitance measurement range: 0 F to 110 mF.
Frequency measurement range: 3 Hz to 1 MHz.
Continuity and Diode tests.
User-defined any sensor measurements and three types of temperature
sensor measurements: TC, RTD and THERM.
Plenty of math operations such as STA (MAX, MIN, AVG, ALL), P/F, dBm , dB,
REL as well as real-time tendency graph and histogram display functions.
Enable to store data and configuration in USB storage device.
Plenty of interfaces: USB Device, USB Host, GPIB, RS232 and LAN.
Support the command sets of RIGOL DM3068, Agilent 34401A (including
some extensions) and Fluke 45.
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Two power management modes: enable or disable the front panel power
switch.
Enable to store 10 groups of system configurations and 5 groups of sensor
configurations in internal memory and recall them when necessary.
Configuration clone: back up all the instrument co nfigurations in a USB
storage device or clone the configurations to other DM3068.
Provide English/Chinese menus and built-in help syste m.
Powerful remote control and any sensor editing software.
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XI
Document Overview
Chapter 1 Quick Start
This chapter guides users to quicky get familiar with the f ront and rear panels, user
interface and measurement connections of the multimeter.
Chapter 2 Front-panel Operations
This chapter introduces how to use the functions of the multimeter from the front
panel.
Chapter 3 Remote Control
This chapter introduces how to control the multime t er remote ly.
Chapter 4 Troubleshooting
This chapter lists the failures that might occur when using the multimeter as well
as their solutions.
Chapter 5 Measurement Tutorial
This chapter introduces how to eliminate the possible errors during the
measurement and obtain accurate measurement result.
Chapter 6 Specifications
This chapter lists the specifications and characteristics of the multimeter.
Chapter 7 Appendix
This chapter provides the accessories information as well as the service
information of the multimeter.
Format Conventions in this Manual:
Button:
The function keys at the front panel of the multimeter are expressed by the
key icons. For example,
key.
Menu:
The operation menu at the bottom of the screen is expressed by “Menu
Word+Character Shading”. For example, the menu “REL” is expressed as
“REL”.
denotes the DC voltage measurement function
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Operation step:
“” is used to indicate operation steps. For example, “ REL” means
pressing and then pressing REL.
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Contents
Guaranty and Declaration ......................................................................... I
Safety Requirement ................................................................................ II
General Safety Summary ........................................................................... II
Safety Terms and Symbols ....................................................................... VI
General Care and Cleaning ...................................................................... VII
Environmental Considerations ................................................................. VIII
DM3068 Overview .................................................................................. IX
Document Overview ............................................................................... XI
Chapter 1 Quick Start ......................................................................... 1-1
General Inspection ................................................................................ 1-2
Handle Adjustment ................................................................................ 1-3
Appearance and Dime nsions ................................................................... 1-4
Front Panel ........................................................................................... 1-5
Rear Panel ............................................................................................ 1-9
User Interface ...................................................................................... 1-13
To Use the Multimeter for the First Time ................................................. 1-14
Measurement Connections .................................................................... 1-15
To Use the Built-in Help System ............................................................. 1-18
To Use the Rack Mount Kit .................................................................... 1-19
Kit Parts List .................................................................................. 1-19
Installation Tool ............................................................................. 1-20
Installation Space .......................................................................... 1-20
Installation Procedures ................................................................... 1-22
Chapter 2 Front Panel Operations ...................................................... 2-1
To Set the Range ................................................................................... 2-2
To Set the Resolution ............................................................................. 2-3
Basic Measurement Functions ................................................................. 2-5
To Measure DC Voltage .................................................................... 2-5
To Measure AC Voltage .................................................................... 2-7
To Measure DC Current ................................................................... 2-9
To Measure AC Current ................................................................... 2-11
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To Measure Resistance ................................................................... 2-14
To Measure Capacitance ................................................................. 2-17
To Measure Continuity .................................................................... 2-19
To Measure Diode .......................................................................... 2-21
To Measure Frequency and Period ................................................... 2-23
Any Sensor Measurement ..................................................................... 2-26
User-defined Sensor ...................................................................... 2-28
Temperature sensor ....................................................................... 2-33
Preset Mode ........................................................................................ 2-37
Secondary Function Key ........................................................................ 2-38
Measurement Configuration .................................................................. 2-40
Integra tion Time ............................................................................ 2-41
DC Impedance .............................................................................. 2-42
Auto Zero ..................................................................................... 2-43
Offset Compensation ...................................................................... 2-44
AC Filter ....................................................................................... 2-45
Short-Circuit R e sis tance .................................................................. 2-46
Current Source .............................................................................. 2-47
Gate Time ..................................................................................... 2-48
Math Operations .................................................................................. 2-49
Math ............................................................................................ 2-50
Tendency Graph ............................................................................ 2-57
Histogram ..................................................................................... 2-59
Trigger ................................................................................................ 2-60
To Select a Trigger Source .............................................................. 2-61
Reading Hold ................................................................................ 2-62
To Set the Tr igger Parameters ......................................................... 2-63
Trigger Output ............................................................................... 2-64
Save and Recall ................................................................................... 2-65
Storage Type ................................................................................. 2-66
Internal Storage ............................................................................ 2-67
External Storage ............................................................................ 2-67
To Save a File ................................................................................ 2-68
Utility .................................................................................................. 2-69
Command S e t ............................................................................... 2-69
Interface Configurations ................................................................. 2-70
System Configuration ..................................................................... 2-77
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To Perform the Self-Test .................................................................. 2-81
Chapter 3 Remote Control .................................................................. 3-1
Web Control .......................................................................................... 3-2
Command Control ................................................................................. 3-5
Remote Control via USB ................................................................... 3-6
Remote Control via LAN ................................................................... 3-8
Remote Control via GPIB ................................................................ 3-11
Remote Control via RS232 .............................................................. 3-13
Chapter 4 Troubleshooting ................................................................. 4-1
Chapter 5 Measurement Tutorial ........................................................ 5-1
Loading Errors (DCV) ............................................................................. 5-2
True-RMS AC Measurements ................................................................... 5-3
Crest Factor Errors (non-sinusoidal inputs) ............................................... 5-5
Loading Errors (ACV) ............................................................................. 5-6
Chapter 6 Specifications ..................................................................... 6-1
DC Charac t eristics ................................................................................. 6-1
AC Characteristics .................................................................................. 6-6
Frequency and Perio d Ch aracteristics ..................................................... 6-11
Capacitance Characteristics ................................................................... 6-13
Temperature Characteristics .................................................................. 6-14
Measurement Rate ............................................................................... 6-16
Other Measuring Characteristics ............................................................. 6-18
General Specifications ........................................................................... 6-20
Chapter 7 Appendix ............................................................................ 7-1
Appendix A: DM3068 Accessories ............................................................ 7-1
Append i x B: Warranty ............................................................................ 7-2
Index ....................................................................................................... 1
User’s Guide for DM3068
Chapter 1 Quick Start RIGOL
1-1
Chapter 1 Quick Start
This chapter guides users to quicky get familar with the f ront and rear panles, user
interface and measurement connections of the multimeter.
This chapter contains the following topics:
General Inspection
Handle Adjustment
Appearance and Dime nsions
Front Panel
Rear Panel
User Interface
First-use of the Multimeter
Measurement Connections
To Use the Built-in Help System
To Use the Rack Mount Kit
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1-2
General Inspection
1． Inspect the shipping container for damage
Keep the damaged shipping container or cushioning material until the
contents of the shipment have been checked for completeness and the
instrument has passed both electrical and mechanical tests.
The consigner or carrier shall be liable for the damage to the instrument
resulting from shipment. RIGOL would not be responsible for free
maintenance/rework or replacement of the unit.
2． Inspect the instrument
In case of any damage, or defect, or failure, notify your RIGOL sales
representative.
3． Check the accessories
Please check the accessories according to the pa ckin g lists. If the accessories
are incomplete or damage d, please co ntact your RIGOL sales representative.
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Chapter 1 Quick Start RIGOL
1-3
Handle Adjustment
To adjust the handle position of the multimeter, grip the handle by both sid es and
pull outward, then rotate the handle to a desired position, see figure below.
Figure 1-1 Handle Adjustment
Viewing Position Carrying Position
Figure 1-2 Place the Multimeter
User’s Guide for DM3068
RIGOL Chapter 1 Quick Start
1-4
5
0
Appearance and Dimensions
231.6
107.
Figure 1-3 Front View Unit: mm
290.
Figure 1-4 Side view Unit: mm
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1-5
5.Power Button 7. Menu Operation Keys 9.Range /Direction Keys
6. Measurement
1.USB Host 2.LCD 3.Auto Trigger/Reading Hold
Front Panel
Function Keys 8.Advanced Operation Menus 10.Signal Input Terminals
Figure 1-5 Front Panel Overview
1. USB Host
USB storage device can be conne cted via this inte rface. By using this interface,
the system configuration or measurement data can be stored into USB
storage dev ice and be re c a l l ed when requi re d.
2. LCD
The instrument provides a 256 x 64 monochrome LCD that can display the
current function menus, measurement parameter settings, system status,
prompt messages and so on.
3. Auto Trigger/Reading Hold
Continuously pressing this key can switch between auto trigger and reading
hold functions.
Auto Trigger: the backlight is al ways on; the multimeter continuously
takes readings at the fastest rate possible for the present configuration.
4.Single Trigger/Local Mode
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1-6
Reading Hold: the backlight blinks; the multimeter obtains a stable
reading and displays it on the screen.
4. Single Trigger/Local Mode
When the multimeter is in local mode, press this key to select single trigger;
the multimeter generates one or the specified number (S No.) of readings
and then waits for the next trigger. When the instrument is in remote mode,
press this key to sw i t ch to local mode.
5. Power Button
Press the button to turn on or off the multimeter. Users can en able or disa ble
this key as required.
Press System Cfg Switch and select “ON” or “OFF”.
6. Measurement Function Keys
Basic Measurement Function Keys
DC Voltage Measurement (DCV)
AC Voltage Measurement (ACV)
DC Current Measurement (DCI)
AC Current Measurement (ACI)
Resistance Measurement (OHM)
Capacitance Measurement (CAP)
Continuity Test (CONT)
Diode Test (DIODE)
Frequency/Period Measurements (FREQ/PERIOD)
Any Sensor Measurements (SENSOR), such as DCV, DCI, 2WR, 4WR,
FREQ, TC (thermoelectric couple), RTD (resistance temperature
detectors) and THERM (thermistor).
Common Function Keys
Quickly save or recall 10 groups of instrument settings.
Second ary Function key
Enable the dual display function.
Quickly save the current instrument configuration when used in
conjunction with .
Quickly enter the setting interface of relative measurement (REL).
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1-7
7. Menu Operation Keys
Press any softkey t o a ctivate the corresponding menu.
8. Advanced Operation Menus
Set all the measurement parameters.
Perform math operations (statistic, P/F, dBm, dB, REL) on the
measurement results and provide real-time tendency graph and
histogram display.
Provide auto, single, external and level trigger; enable to set the
reading hold function, number of samples per trigger, delay tim e
before reading and edge of the trigger input signal as well as the
trigger output parameter.
Save the system configuration and measurement data into internal
memory or exte r n al USB storage device and recall or delete them
when required.
Select command set for the multimeter; configure the interface
parameters and sy stem parameters; execute self-test and view the
system information and error messages.
Provide help information for common opera t i on s and the use method
of the built-in help. The multimeter allows users to quickly recall the
help information about any front panel keys and menu softkeys.
9. Range/Direction Keys
Enable auto range.
Configure the measurement parameters.
Select the cursor position while entering a parameter.
Increase or decrease the measurement range.
Enter desired numeric value while setting a parameter.
Page up or d own.
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1-8
10. Signal Input Terminals
The measured signal (device) will be connected into the multimeter through
these terminals. Different measurement objects have different connection
methods. For details, please refer to “Measurement Connections”.
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1-9
Fuse 11.Power Switch
Rear Panel
1.Current Input Fuse 2. LAN 3.GPIB 4.Power Socket
5.VMC 7.USB Device 9.Power
1. Current Input Fuse
The multimeter uses two kinds of fuses for input protections of small and large
current ranges. The internal fuse of the multimeter provides 10 A maximum
input protection for the l arge current r an ge and w he n the in put cur rent exceeds
13.5 A, the fuse will blow out; while the current input fuse at the rear panel of
the instrument provides 500 mA maximum input prot ection fo r the small current
range and when the input current exceeds 650 mA, the fuse will blow out. The
large current input fuse has been installed when the instrument left factory. To
replace the small current fuse, please:
1) Turn off the multimeter and remove the power
cord.
2) Turn the fuse seat counterclockwise as shown in the
figure using a straight screw driver a nd t h en pull
out the fuse seat.
6.Ext T rig 8.RS232 10.Voltage Selector
Figure 1-6 Rear Panel Overview
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RIGOL Chapter 1 Quick Start
1-10
3) Place a new specified fuse.
4) Reinstall the fuse seat into the slot.
Note: the large cu rr ent fuse stands inside the multimeter and is not allowed to
be replaced by users themselves. If a new fuse is required, please contact
RIGOL.
2. LAN
Through this interface, the multimeter can be connected to the network for
remote contr ol . The multimeter conforms to LXI-C standards; it can be used in
connection with other standard devices to quickly build a testing system and
easily realize LAN based system integration.
3. GPIB
Conform to IEEE-488.2 standards.
4. Power Socket
The multimeter accepts two types of AC supplies. Please use the power cord
provided in the accessories to connect the multimeter to the AC power
through this socket.
Note: a proper v oltage scale must be first selected (through the Voltage
Selector) before power connection.
Figure 1-7 Connect the Power Cord
5. VMC
The mutlimeter outputs a low-true pulse from the [VM Comp] connector after
every measurement when VM output is enabled ( VMC ON).
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1-11
6. Ext Trig
Trigger the multimeter by connecting a trigger pulse through the [Ext Trig]
connector. Note the external trigger source must be selected ( Source
Ext).
7. USB Device
Connect the PC through this interface. You can use SCPI commands or PC
software to control DM3068 remotely.
8. RS232
Connect the PC through this interface. You can use SCPI commands or PC
software to control DM3068 remotely. You can also use this interface to output
the P/F test result.
9. Power Fuse
The multimeter is already installed with a powe r fuse before leaving factory. To
replace a new one, please:
1) Turn off the multimeter and remove the power cord.
2) Press down the block tongue using a straight screwdriver (in the direction of
the dotted arrow in the figure below) and pull out of the fuse seat.
3) Select a proper voltage scale.
4) Replace a specified fuse.
5) Reinstall the fuse seat into the slot.
Figure 1-8 Replace the Power Fuse
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1-12
WARNING
In order to avoid electric shock or fire, please just use the specified fuse
and make sure the fuse holder is not short-circuited.
10. Voltage Selector
Select a proper voltage scale (115 V or 230 V) accor ding to the AC supply used.
11. Power Switch
Connect or disconnect the AC supply. If the power button at the front panel is
disabled ( System Cfg Switch OFF), turning on this switch will
directly start up the multimeter.
User’s Guide for DM3068
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