DM7275-01
HIOKI DM7275A961-02
DM7275
DM7276
DM7275-02
DM7275-03
DM7276-01
DM7276-02
DM7276-03
Instruction Manual
PRECISION DC VOLTMETER
Be sure to read this manual before using the instrument.
When using the instrument for the
rst time
Part Names and Functions
Operating the Instrument
Preparing for Measurement
Feb. 2021 Revised edition 2
DM7275A961-02 21-02H
Troubleshooting
p.14 Maintenance and Service
p.17
p.23 Error Displays
Q&A (Frequently
Asked Questions)
p.5, p.7
p.167
p.168
p.176
EN
HIOKI DM7275A961-02
Measurement process
HIOKI DM7275A961-02
This section describes voltage measurement as performed in a typical application.
Example use: Measuring a battery’s voltage
Preparations
(1) Position the instrument as desired. (p. 7)
Measurement process
50 mm or more 50 mm or more
(2) Perform the pre-measurement inspection. (p. 24)
(3) Connect the power cord. (p. 25)
Power cord To outlet
(4) Connect the measurement cables to the measurement terminals. (p. 26)
150 mm or more
Rear
DM7275A961-02
(5) Connect the temperature sensor to the TEMP.SENSOR connector.
(When performing temperature measurement or using the temperature compensation) (p. 27)
(6) Congure and connect the external interface (as necessary).
• Using the USB interface (p. 98)
• Using the RS-232C interface (p. 100)
• Using the GP-IB interface (p. 102)
• Using the LAN interface (p. 104)
• Using a USB ash drive (p. 115)
• Using the EXT I/O connector (p. 125)
Measurement process
HIOKI DM7275A961-02
(7) Turn on the instrument. (p. 28)
(8) Set the time and date. (p. 30)
Measurement
(9) Set the measurement range. (p. 35) (default setting: AUTO range)
When using the auto-range setting, the instrument will automatically select the optimal range.
To x the range manually: Manual range (p. 35)
(10) Set the measurement speed. (p. 35) (default setting: MEDIUM)
(11) Switch the measured value display. (p. 18) (default setting: V)
(12) Connect the measurement cables to the measurement target. (p. 31)
Black
Red
(13) Perform measurement. (p. 37)
• To enable the trend display (time-axis display) or to display judgment results: (p. 43)
• To display information other than measured values (error display): (p. 46), (p. 176)
• To assign names to measured values: (p. 49)
• To hold the measured value display: (p. 37), (p. 70)
• To change the number of display digits: (p. 48)
Contents
HIOKI DM7275A961-02
Contents
Introduction ................................................ 1
Verifying Package Contents ..................... 2
Safety Information ..................................... 5
Operating Precautions .............................. 7
1 Overview 13
1.1 Product Overview ........................... 13
1.2 Features .......................................... 13
1.3 Part Names and Functions ............ 14
1.4 Screen Layout ................................ 16
1.5 Operating the Instrument .............. 17
Changing settings .......................................17
Returning to the previous screen ................17
Switching the measured value display ........18
Changing the range ....................................18
Changing the measurement speed .............19
Starting measurement ................................20
1.6 How to Use This Manual ................ 21
2 Preparing for
Measurement 23
2.1 Preparation Process ...................... 23
2.2 Performing the Pre-
measurement Inspection ............... 24
2.3 Connecting the Power Cord .......... 25
2.4 Connecting the Measurement
Cables (to the Instrument) ............. 26
2.5 Connecting the Temperature
Sensor ............................................. 27
2.6 Turning the Instrument On and
O .................................................... 28
2.7 Setting the Time and Date ............. 30
3.5 Measurement Error Displays
(Displays Other Than Measured
Values) ............................................. 46
Measurement error detection order ............47
3.6 Changing the Number of Display
Digits ............................................... 48
3.7 Displaying Labels (Assigning
Names to Measured Values) .......... 49
4 Judging Measured
Values 51
4.1 To Obtain Accurate Judgments
Even When the Polarity of the
Measurement Target (Battery,
etc.) Is Reversed ............................. 52
4.2 Comparator Measurement
(Using a Single Judgment
Standard) ........................................ 53
To check judgments aurally ........................55
To perform judgment after measured
values stabilize ...........................................56
To output judgment results to an
external device or to print judgment results 56
4.3 BIN Measurement (Using
Multiple Judgment Standards) ...... 57
To output judgment results to an
external device or to print judgment results 59
5 Saving and Loading
Measurement
Conditions (Internal
Memory) 61
1
2
3
4
5
6
9
3 Measurement 31
3.1 Connecting the Measurement
3.2 Setting the Measurement Range .. 35
3.3 Setting the Measurement Speed ... 36
3.4 Starting Measurement ................... 37
Cables (Measurement Target) ....... 31
Continuous measurement ...........................37
Trigger measurement (measurement
with user-specied timing) ..........................38
Storage of measurement data in the
instrument’s internal memory ......................42
Displaying trends, bar graphs, statistics,
and judgment results ..................................43
Checking the voltage trend .........................45
5.1 Saving Measurement Conditions
(Panel Save Function) .................... 62
5.2 Loading Measurement
Conditions (Panel Load Function) .. 64
5.3 Changing the Panel Name ............. 65
5.4 Deleting a Panel ............................. 66
6 Useful Functionality 67
6.1 Obtaining Stable Measured
Values .............................................. 67
Setting the integration time .........................67
Reducing measured value variability
(smoothing function) ...................................69
6.2 Auto-hold Function ........................ 70
6.3 Contact Check ................................ 71
6.4 Switching the Input Resistance .... 76
10
Ind. Ind.
i
Contents
HIOKI DM7275A961-02
6.5 Correcting Measured Values ......... 77
Adjusting the zero-point (NULL function) ....78
Compensating the eects of temperature
(temperature
Correcting measured values using a
linear expression (scaling function) ............82
compensation
function) ..........80
6.6 Statistical Calculations .................. 84
Displaying, clearing, and printing
statistical calculation results .......................85
7 System Settings 87
7.1 Key Lock (Disabling Instrument
Operation) ....................................... 87
7.2 Buzzer Settings .............................. 88
7.3 Adjusting the Screen Brightness .. 89
7.4 Changing the Screen Color ........... 89
7.5 Adjusting the Touch Panel
Position ........................................... 90
7.6 Setting the Power Supply
Frequency ....................................... 90
7.7 Selecting Startup Load Settings
and a Panel ..................................... 91
7.8 Setting Output Formats ................. 92
7.9 Resetting the Instrument
(Reverting the Instrument to Its
Factory Settings) ............................ 93
List of default settings .................................94
8 Preparing to Use USB,
RS-232C, GP-IB, and
LAN Control 97
8.1 Overview of Interfaces and
Associated Features ...................... 97
8.2 Preparing to Use an Interface
(Connection and Settings) ............ 98
Using the USB interface .............................98
Using the RS-232C interface
(Available for the DM7275-03 and
DM7276-03 only) ......................................100
Using the GP-IB interface
(Available for the DM7275-02 and
DM7276-02 only) ......................................102
Using the LAN interface ............................104
8.3 Communications Settings ........... 109
Communications monitor (displaying
communications commands) ....................109
Setting the format for measurement ......... 110
Setting the model name acquired by
commands ................................................ 110
9 Outputting Data 111
9.1 Interface Settings ..........................111
9.2 Output Methods .............................112
9.3 Data Output Settings ....................113
10 Using a USB Flash
Drive 115
10.1 Overview ........................................115
10.2 Connecting a USB Flash Drive ....116
10.3 Setting the Interface ......................117
10.4 Setting the Output Data Type .......117
10.5 Outputting Data
(USB Flash Drive) ..........................118
Outputting measurement data or
screenshots .............................................. 11 8
Outputting all measurement data .............. 11 9
10.6 Outputting and Loading
Measurement Conditions
(USB Flash Drive) ......................... 120
Outputting measurement conditions .........120
Loading measurement conditions .............122
10.7 Files ............................................... 123
File format .................................................123
11 External Control
(EXT I/O) 125
11.1 External Control Measurement
Process ......................................... 125
11.2 Switching between Current Sink
(NPN) and Current Source (PNP) 126
11.3 Connections (Instrument and
Control Device) ............................. 127
Instrument connector and compatible
connectors ................................................128
Signal functions ........................................129
Internal circuit architecture ........................133
Electrical specications .............................134
Example connections ................................134
11.4 Conguring External Input and
Output ........................................... 136
Input lter ..................................................136
EOM signal output type ............................137
11.5 Input Test/Output Test ................. 138
11.6 Timing Chart ................................. 139
Timing from the start of measurement to
acquisition of judgment results .................139
Panel load timing ......................................141
Output signal status when the
instrument is turned on .............................142
ii
Contents
Appx.
HIOKI DM7275A961-02
Measurement process (starting
measurement from an external device
and loading judgment results) ...................142
12 Printing (Available for
the DM7275-03 and
DM7276-03 only) 143
12.1 Printer Settings ............................ 144
12.2 Connecting the Printer to the
Instrument ..................................... 146
12.3 Conguring the Instrument ......... 146
12.4 Printing .......................................... 147
Print examples ..........................................148
13 Specications 151
13.1 General Specications ................ 151
13.2 Measurement Specications ....... 152
Basic specications ..................................152
Accuracy specications ............................155
13.3 Functional Specications ............ 157
13.4 Interface Specications ............... 163
Internal insulation defects in lithium-ion
batteries ...............................................Appx.2
Enclosure potential measurement .......Appx.3
Appx. 3 Causes of Error in
Voltage Measurement ...... Appx.5
Thermal electromotive force ................Appx.5
Eects of input resistance ....................Appx.6
Eects of bias current ..........................Appx.6
Eects of high-voltage measurement ..Appx.7
Eects of burst noise ...........................Appx.7
Appx. 4 Noise Countermeasures . Appx.8
Eects of induced noise .......................Appx.8
Eects of conductive noise ................Appx.10
Appx. 5 Self-calibration ................Appx.11
Appx. 6 Measuring Multiple
Targets ............................ Appx.12
Appx. 7 Rack Mounting ............... Appx.14
Rack-mounting hardware reference
gures ................................................Appx.14
Installation instructions ......................Appx.17
Appx. 8 Outline Drawings ........... Appx.21
Appx. 9 Calibration ...................... Appx.22
Appx. 10 Adjustment ..................... Appx.23
Index Ind.1
11
12
13
14
15
7
14 Maintenance and
Service 167
Calibration and repair ...............................167
Transporting the instrument ......................167
Replacement parts and their service lives ..167
14.1 Q&A (Frequently Asked
Questions) .................................... 168
1. General issues ......................................168
2. Measurements ......................................169
3. Communications ...................................171
4. EXT I/O .................................................173
Frequently Asked Questions for External
Control (EXT I/O) ......................................175
14.2 Cleaning ........................................ 175
14.3 Error Displays ............................... 176
14.4 Disposing of the Instrument ....... 180
15 License Information 181
Appendix Appx.1
8
8
9
10
Ind. Ind.
Ind.
Appx. 1 Block Diagram .................. Appx.1
Appx. 2 Measuring the Enclosure
Potential of Laminated
Lithium-ion Batteries ....... Appx.2
iii
Contents
HIOKI DM7275A961-02
iv
Introduction
HIOKI DM7275A961-02
Introduction
Thank you for purchasing the Hioki DM7275, DM7276 Precision DC Voltmeter. To obtain maximum
performance from the instrument, please read this manual rst, and keep it handy for future
reference.
The DM7276 oers higher precision than the DM7275.
: Available,
Model Interface
DM7275 DM7276 LAN USB GP-IB RS-232C
DM7275-01 DM7276-01
– –
: Not available
–
1
2
DM7275-02 DM7276-02
DM7275-03 DM7276-03
The instrument comes with the following documentation. Please refer to these resources as
necessary in light of your specic application. Please review the separate “Operating Precautions”
before using the instrument.
Type Manual contents
Operating Precautions Information to ensure safe use of the instrument
Instruction Manual (this manual) Detailed information about functionality and
operation; specications
Communication Command
Instruction Manual
Explanation of communications commands for
controlling the instrument
–
Printed
edition
–
Trademarks
• Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation
in the United States and other countries.
• Other products and company names are trade names, registered trademarks, or trademarks of
their respective owners.
Notations
–
CD edition
–
–
3
4
5
6
7
*
SET
(bold)
[ ] Operation keys are indicate in [ ] square brackets.
Unless otherwise specied, “Windows” represents Windows 7 and Windows 8.
Additional information is presented below.
Names and keys on the screen are indicated with bold characters.
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values,
with the following meanings:
f.s.
rdg.
dgt.
See “Accuracy specications” (p. 155).
(Maximum display)
The maximum displayable value.
(Reading)
The value currently being measured and indicated on the measuring instrument.
(Resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the input value that
causes the digital display to show a "1" as the least-signicant digit.
8
9
10
Appx. Ind.
1
Verifying Package Contents
HIOKI DM7275A961-02
Verifying Package Contents
• When you receive the instrument, inspect it carefully to ensure that no damage occurred during
shipping. In particular, check the accessories, panel switches, buttons, keys and connectors. If
damage is evident, or if it fails to operate according to the specications, contact your authorized
Hioki distributor or reseller.
• Store the packaging in which the instrument was delivered, as you will need it when transporting
the instrument.
Check if the package contents are correct.
DM7275 or DM7276
Application disc (CD)
(Communication Command
Instruction Manual (PDF) and USB
Driver are included)
• The latest version can be
downloaded from Hioki’s website.
Accessories
Power supply cord Instruction manual
(this document)
Instruction manuals may
also be available in other
languages.
Please visit Hioki’s website at
http://www.hioki.com.
2
Verifying Package Contents
HIOKI DM7275A961-02
Options (Sold Separately)
The options listed below are available for the instrument. To order an option, please contact your
authorized Hioki distributor or reseller.
Options are subject to change. Please check Hioki’s website for the latest information.
Measurement cables (general voltage measurements)
L9207-10
Test Lead
Pin diameter: φ2 mm
L4930
Connection Cable Set
Length: 1.2 m
L4931
Extension Cable Set
Length: 1.5 m
With coupling connector
L4933
Contact Pin Set
Pin diameter: φ1 mm
L4934
Small Alligator Clip Set
Maximum clip width:
4 mm
φ
L4935
Alligator Clip Set
Maximum clip width:
25 mm
φ
L9243
Grabber Clip
Maximum clip width:
2 mm
φ
L4936
Bus Bar Clip Set
Maximum clip width:
25 mm
φ
(Objects to be measured
which are 30 mm or less
can be clipped.)
1
2
3
4
5
6
Measurement
cable
L9207-10, L4932
L4930, L4931, L4935
L4933 30 V AC/60 V DC
L4934
L9243
L4936
*: Measurements over measuring instrument's rated voltage are not possible.
See “Inspection before use” (p. 7)
Temperature measurements
Z2001 Temperature Sensor
Safety extra-low
voltage
–
– –
–
–
– –
CAT II* CAT III* CAT IV*
1000 V 1000 V 600 V 10 A
1000 V 600 V 10 A
– – –
600 V 300 V
1000 V
– –
600 V
L4932
Test Pin Set
Pin diameter: φ2 mm
Rated
current
3 A
–
–
3 A
1 A
5 A
7
8
9
10
Appx. Ind.
3
Verifying Package Contents
HIOKI DM7275A961-02
Communication interface
9637 RS-232C Cable
9151-02 GP-IB Connector Cable
L1002 USB Cable (A - B)
9642 LAN Cable
For printing (Available for the DM7275-03 and DM7276-03 only)
9442 Printer
9 pins-9 pins/1.8 m/cross
2 m
A-B type
9443-01 AC Adapter
9443-02 AC Adapter
1196 Recording Paper
9444 Connection Cable
For Japan
For countries other than Japan
To connect the instrument and
the 9442 printer
4
Safety Information
HIOKI DM7275A961-02
Safety Information
This instrument is designed to conform to IEC 61010 Safety Standards, and has been thoroughly
tested for safety prior to shipment. However, using the instrument in a way not described in this
manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the following safety notes.
DANGER
Mishandling during use could result in injury or death, as well as damage to the
instrument. Be certain that you understand the instructions and precautions in
the manual before use.
1
2
WARNING
With regard to the electricity supply, there are risks of electric shock, heat
generation, re, and arc discharge due to short circuits. If persons unfamiliar
with electricity measuring instrument are to use the instrument, another person
familiar with such instruments must supervise operations.
• This instrument is measured on a live line. To avoid electric shock when
measuring live lines, wear appropriate protective gear, such as insulated rubber
gloves, boots and a safety helmet.
Notations
In this manual, the risk seriousness and the hazard levels are classied as follows.
DANGER
WARNING
CAUTION
IMPORTANT
Indicates an imminent hazardous situation that will result in death or serious injury to
the operator.
Indicates a potentially hazardous situation that may result in death or serious injury to
the operator.
Indicates a potentially hazardous situation that may result in minor or moderate injury
to the operator or damage to the instrument or a malfunction.
Indicates information related to the operation of the instrument or maintenance tasks
with which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the instrument is mishandled, this may
give rise to a hazardous situation; the operator may receive an electric shock, may get
burnt or may even be fatally injured.
3
4
5
6
7
8
Indicates a prohibited action.
Indicates the action which must be performed.
9
10
Appx. Ind.
5
Safety Information
HIOKI DM7275A961-02
Symbols on the instrument
Indicates cautions and hazards.
When the symbol is printed on the
instrument, refer to a corresponding
topic in the Instruction Manual.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates the ON side of the power
switch.
Indicates the OFF side of the power
switch.
Symbols for standards
Indicates the Waste Electrical and
Electronic Equipment Directive
(WEEE Directive) in EU member
states.
Indicates that the product conforms
to regulations set out by the EC
Directive.
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards
for various electrical environments, categorized as CAT II to CAT IV, and called measurement
categories.
DANGER
• Using a measuring instrument in an environment designated with a higher-
numbered category than that for which the instrument is rated could result in a
severe accident, and must be carefully avoided.
• Using a measuring instrument without categories in an environment designated
with the CAT II to CAT IV category could result in a severe accident, and must
be carefully avoided.
This instrument conforms to the safety requirements for CAT II 300 V measuring instruments.
CAT II: When directly measuring the electrical outlet receptacles of the primary electrical
circuits in equipment connected to an AC electrical outlet by a power cord (portable
tools, household appliances, etc.).
CAT III: When measuring the primary electrical circuits of heavy equipment (xed installations)
connected directly to the distribution panel, and feeders from the distribution panel to
outlets.
CAT IV: When measuring the circuit from the service drop to the service entrance, and to the
power meter and primary overcurrent protection device (distribution panel).
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
Internal wiring
CAT II
CAT III
T
Outlet
6
Fixed installation
Operating Precautions
HIOKI DM7275A961-02
Operating Precautions
Follow these precautions to ensure safe operation and to obtain the full benets of the various
functions.
Use of the instrument should conrm not only to its specications, but also to the specications of
all accessories, options, and other equipment in use.
1
Inspection before use
• If the measurement cable or the instrument is damaged, there is a risk of
electric shock. Before using the instrument perform the following inspection.
• Before using the instrument, make sure that the insulation on the cables are
undamaged and that no bare conductors are improperly exposed. Using the
instrument under such conditions could result in electric shock. Replace the
cable with those specied by our company.
• To prevent an electric shock, conrm that the white portion (insulation layer)
inside the cable is not exposed. If a color inside the cable is exposed, do not
use the cable.
• Before using the instrument for the rst time, verify that it operates normally
to ensure that no damage occurred during storage or shipping. If you nd any
damage, contact your authorized Hioki distributor or reseller.
Installation environment
Installing the instrument in inappropriate locations may cause a malfunction of
instrument or may give rise to an accident. Avoid the following locations.
• Exposed to direct sunlight or high temperature
• Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or electrostatic charge
• Near induction heating systems (such as high-frequency induction heating
systems and IH cooking equipment)
• Susceptible to vibration
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to high quantities of dust particles
2
WARNING
3
4
5
6
WARNING
7
8
9
10
Appx. Ind.
7
Operating Precautions
HIOKI DM7275A961-02
Installation method
• Do not place the instrument on an unstable table or an inclined place. Dropping or
knocking down the instrument can cause injury or damage to the instrument.
• Install the instrument with the bottom facing down.
• To prevent overheating, be sure to leave the specied clearances around the instrument.
CAUTION
50 mm or more 50 mm or more
The stand can be used to lift the instrument's front panel. (p. 14)
The instrument can also be mounted on racks.(p. Appx.14)
Unplugging the power cord kills power to the instrument. Be sure to provide enough unobstructed
space to unplug the power cord immediately in an emergency.
Handling the instrument
DANGER
To avoid electric shock, do not remove the instrument's case. The internal
components of the instrument carry high voltages and may become very hot
during operation.
CAUTION
150 mm or more
Rear
To avoid damage to the instrument, protect it from physical shock when transporting
and handling. Be especially careful to avoid physical shock from dropping.
This instrument may cause interference if used in residential areas. Such use must be avoided
unless the user takes special measures to reduce electromagnetic emissions to prevent
interference to the reception of radio and television broadcasts.
Precautions when using the included application disc
• Exercise care to keep the recorded side of discs free of dirt and scratches. When writing text on a
disc’s label, use a pen or marker with a soft tip.
• Keep discs inside a protective case and do not expose to direct sunlight, high temperature, or
high humidity.
• Hioki is not liable for any issues your computer system experiences in the course of using this
disc.
Before connecting a power cord
WARNING
To avoid electrical accidents and to maintain the safety specications of this
instrument, connect the power cord provided only to an outlet.
8
Before connecting a measurement cable
HIOKI DM7275A961-02
DANGER
Measurement cables should only be connected to the secondary side of a
breaker. Any short-circuit current at the secondary side will be cut-o by the
breaker. Connections should never be made to the primary side of a breaker,
because unrestricted current ow could damage the instrument and facilities if a
short circuit occurs.
WARNING
• To avoid electric shock and short-circuit accidents, use only the specied
measurement cables to connect the instrument input terminals (HIGH and LOW
terminals) to the circuit over 60 V DC to be tested.
• To prevent an electric shock, do not exceed the lower of the ratings shown on the
instrument and test leads.
Operating Precautions
1
2
3
4
Before connecting a temperature sensor
IMPORTANT
Connect the temperature sensor by inserting the plug all the way in the TEMP.SENSOR
connector. Insucient connection may cause larger errors in measured values.
Before turning the power ON
WARNING
Before turning the instrument on, make sure the supply voltage matches that
indicated on its power connector. Connection to an improper supply voltage may
damage the instrument and present an electrical hazard.
CAUTION
Avoid using an uninterruptible power supply (UPS) or DC/AC inverter with rectangular
wave or pseudo-sine-wave output to power the instrument. Doing so may damage the
instrument.
5
6
7
8
9
10
Appx. Ind.
9
Operating Precautions
HIOKI DM7275A961-02
Before starting a measurement
Voltage measurements
• The maximum rated voltage between input terminals and the ground is as
follows.
CAT II: 300 V AC/DC
No measurement category: 800 V AC/DC
If their voltages are exceeded, this instrument will be damaged and personal
injury will result. Therefore, do not perform measurement in this case.
• Maximum input voltage of the voltage measurement terminals is 1000 V DC,
105 VHz AC, 1500 V peak. However, voltages over 800 V can be measured only
if the circuit to be measured is isolated from the ground. If their voltages are
exceeded, this instrument will be damaged and personal injury will result.
Therefore, do not perform measurement in this case.
• To avoid electric shock, be careful to avoid shorting live lines with the
measurement cables.
Temperature measurements
DANGER
CAUTION
• To avoid damage to the instrument, do not apply voltage to TEMP.SENSOR
connector.
• Temperature sensors are not waterproof. Do not soak the sensor in water.
IMPORTANT
• The object to be measured for temperature compensation and the temperature sensor
should be given adequate time to adapt to the ambient temperature. If lesser time is given for
adaptation to ambient temperature may cause larger errors.
• Handling temperature sensors with bare hands may cause induction noise resulting in unstable
measured values.
• Temperature sensors are used to measure ambient temperature. Temperature sensors on the
surface of the object to be measured cannot measure correct temperature of the object itself.
If there is a large dierence in temperature between the ambient temperature and temperature
of the object to be measured, use an aluminum tape to attach the temperature sensor onto the
object while ensuring that the object is not short-circuited.
Before connecting the communication cables (USB, LAN, RS-232C, GP-IB)
10
CAUTION
Before connecting or disconnecting any communications cable, always turn o the
instrument and equipment to be connected with. This may cause malfunction or
damage.
Before making a connection to the USB connector
HIOKI DM7275A961-02
CAUTION
• To avoid equipment failure, do not disconnect the USB cable while communications
are in progress.
• Use a common ground for both the instrument and the computer. Use of dierent
ground circuits will result in a potential dierence between the instrument's ground
and the computer's ground. If the USB cable is connected while such a potential
dierence exists, it may result in equipment malfunction or failure.
Before connecting to the RS-232C or GP-IB connectors
Operating Precautions
1
2
• Use a common ground for the instrument, computer and programmable controller.
Use of dierent ground circuits will result in a potential dierence between the
instrument's ground and grounds of the computer and programmable controller. If the
communications cable is connected while such a potential dierence exists, it may
result in equipment malfunction or failure.
• After connecting the communications cable, tighten the screws on the connector
securely. Failure to secure the connector could result in equipment malfunction or
damage.
Before connecting a USB ash drive
• Inserting a USB ash drive upside down, backwards or in the wrong direction may
damage the USB ash drive or the instrument.
• Some USB ash drives are susceptible to static electricity. Exercise care when using
such products because static electricity could damage the USB ash drive or cause
malfunction of the instrument.
CAUTION
CAUTION
3
4
5
6
7
With some USB ash drives, the instrument may not start up if power is turned on while the USB
ash drive is inserted. In such a case, turn power on rst, and then insert the USB ash drive.
It is recommended to try out operation with a USB ash drive before starting to use it for actual
measurements.
Before switching the current sink (NPN) / current source (PNP)
CAUTION
• Never switch between NPN and PNP while the instrument's power is on.
• Congure the NPN/PNP setting based on the externally connected device.
8
9
10
Appx. Ind.
11
Operating Precautions
HIOKI DM7275A961-02
Before connecting to the EXT I/O connector
WARNING
To avoid electric shock or damage to the equipment, always observe the following
precautions when connecting to EXT I/O connector.
• Always turn o the power to the instrument and to any devices to be connected
before making connections.
• Be careful to avoid exceeding the rating of EXT I/O connector signal.
Before connecting a printer
WARNING
• To avoid electric shock, turn o the power to all devices before plugging or
unplugging any cable between the printer and the instrument.
12
1
HIOKI DM7275A961-02
Overview
1.1 Product Overview
The Hioki DM7275 and DM7276 Precision DC Voltmeters can measure DC voltages from lithium-
ion batteries, electric double-layer capacitors, and other components as well as DC voltages output
by sensors and other devices with a high degree of accuracy.
1.2 Features
High-accuracy measurement
The DM7275 and DM7276 deliver the following basic accuracy (in the 10 V range):
DM7275 0.0020% rdg. +12 µV
DM7276 0.0009% rdg. +12 µV
The DM7276 can measure a 4 V lithium-ion battery with accuracy of 48 µV.
Contact check function
When this function is enabled, measured values are displayed only when the measurement cables
are properly connected to the measurement target. It is particularly useful as a way to ensure highly
reliable results when measuring the potential on the exterior of a lithium-ion battery.
1
Overview
Temperature compensation
In addition to DC voltage, the DM7275/DM7276 can measure ambient temperature. When
measuring a target that exhibits a high degree of temperature dependency, this function corrects
voltage measured values using the measured temperature, making it possible to convert them to to
voltage values at a reference temperature.
High-speed measurement and measured value memory
The DM7275/DM7276 can continuously save data to its 5000 data point internal memory at speeds
of up to 1 ms. This capability can be used to monitor instantaneous voltage uctuations or measure
multiple targets.
Extensive interface options
The DM7275/DM7276 provides USB, LAN, RS-232C*, GP-IB*, and EXT I/O interfaces, enabling its
use in a variety of applications.
*These interfaces are factory options that must be specied at the time of shipment.
Intuitive user interface
The DM7275/DM7276 has a 4.3” color LCD and an intuitive, touch-panel based user interface. It
also provides extensive analytical functionality, including statistical calculations and trend plots.
Smooth integration into production lines
• Since the DM7275/DM7276’s free power supply specications can accommodate a power supply
from 100 to 240 V, it can be easily deployed on production lines overseas.
• The instrument’s communications monitor and EXT I/O test functions facilitate smooth debugging
of testing systems.
• Judgment functions can be used to generate PASS/FAIL judgments based on the classication of
measurement results into HI, IN, and LO categories (comparator function) or to rank targets into
up to 10 categories (BIN function).
13
Part Names and Functions
HIOKI DM7275A961-02
1.3 Part Names and Functions
Front
1 Display
(Touch panel)
2 Operation
keys
3 POWER
button
(p. 28)
USB ash drive
4
connector
5 Voltage
measurement
terminals
1
2
3
5
View measured values, settings, and judgment results; congure instrument settings.
• Display the Settings screen and Measurement screen (measured values and judgment
results) (p. 16).
• Congure settings (p. 17).
For more information: See “1.5 Operating the Instrument” (p. 17).
[V/°C] key Toggles display of
[NULL] key Adjusts the instrument’s
[RUN/STOP]
key
[TRIG] key Starts measurement (to
Switches the instrument’s
power state.
Outputs measurement data, screen data, and measurement conditions; loads
measurement conditions (p. 115).
Connect the measurement
cables (p. 26).
See “Before connecting a measurement cable”(p. 9).
temperature measured
values.
zero-point.
Starts and stops
measurement.
make measurements at
the desired timing).
4
[AUTO] key Enables auto-range
[RANGE]
[] key
[] key Decreases the range (to
[SPEED] key Changes the measurement
OFF: The instrument is o (no power is being supplied).
RED:
GREEN: The instrument is on.
HIGH terminal: Connect the red cable.
LOW terminal: Connect the black cable.
The instrument is in the SLEEP state (power is
being supplied).
operation (to automatically
select an appropriate range).
Increases the range (to
measure high voltages).
measure at a higher degree
of resolution).
speed.
Bottom
14
Foot
Foot
When mounting the instrument in a rack
Be sure to collapse the feet all the way.
See: “Appx. 7 Rack Mounting” (p. Appx.14)
When using the feet
Be sure to:
• Open the feet all the way, without stopping partway.
• Erect both feet.
Rear
HIOKI DM7275A961-02
Part Names and Functions
DM7275-02
DM7276-02
2
3*
DM7275-03
DM7276-03
1
10
9
7 8
*: The slot of the DM7275-01 and DM7276-01 is covered with a blank panel.
1
Power inlet
2 NPN/PNP switch Switches the EXT I/O
3 GP-IB connector Used in GP-IB communications (p. 102).
Connect the power cord (p. 25).
See “Before connecting a power cord”(p. 8).
between NPN and PNP
modes (p. 126).
Connect the instrument to a computer with a GP-IB cable.
56
Left: Current sink (NPN)
Right: Current source (PNP)
4*
1
Overview
4 RS-232C connector Used in RS-232C communications (p. 100).
Connect the instrument to a computer, programmable controller, printer, or other
device with an RS-232C cable.
TEMP.SENSOR
5
connector
6 EXT I/O connector Used in external control (p. 125).
7 USB connector Used in USB communications (p. 98).
8 Serial number Do not remove the serial number as it is necessary for management
9 LAN connector Used in LAN communications (p. 104).
10 Main power switch Turns the instrument’s
Used to measure temperature (p. 27).
Connect the Z2001 Temperature Sensor.
Connect the input signal from a programmable controller, I/O board, or other
device to control the instrument.
See “Before connecting to the EXT I/O connector”(p. 12).
Connect the instrument to a computer with a USB cable.
purposes.
The serial number consists of 9 digits. The rst two (from the left) indicate the year
of manufacture, and the next two indicate the month of manufacture.
Connect the instrument to a computer with a LAN cable.
main power supply on and
o (p. 28).
: Main power supply o
: Main power on
: Available, −: Not available
Model Interfaces
DM7275 DM7276 LAN USB GP-IB RS-232C
DM7275-01 DM7276-01
DM7275-02 DM7276-02
DM7275-03 DM7276-03
− −
−
−
15
Screen Layout
HIOKI DM7275A961-02
1.4 Screen Layout
Measurement screen Settings screen
Touch the measurement parameter, measurement range, measurement speed, or MENU on the touch panel.
Screen name
Touch [×] to close the screen.
Touch
DISP.
Touch
NUMERIC.
Measurement screen + sub-display selection
Touch the item you wish to display on the
sub-display.
See “Displaying trends, bar graphs,
statistics, and judgment results”(p. 43)
Measurement screen + sub-display
Example: If you touch the measurement speed
Example: If you touch BAR GRAPH
16
Touch DISP.
Sub-display
1.5 Operating the Instrument
HIOKI DM7275A961-02
The instrument is operated using the operation keys and the touch panel.
Operating the Instrument
1
Changing settings
Settings are changed using the touch panel.
1
Touch MENU.
Returning to the previous screen
2
Touch a setting and change its value on
the displayed Settings screen.
Overview
Or
17
Operating the Instrument
HIOKI DM7275A961-02
Switching the measured value display
Operation key
Each time the key is pressed, the measured
values shown on the screen will switch between
voltage only and voltage and temperature.
• When measuring temperature, connect the temperature sensor to the instrument in advance.
(p. 27)
• Temperature measured values are not shown on the trend display or settings screens.
• The instrument will continue to measure temperature internally even if the temperature is not
being displayed on the screen.
• The temperature display is updated together with the voltage display.
Changing the range
Touch panel
1
2
See “3.2 Setting the Measurement Range” (p. 35).
Operation keys
Causes the optimal range to be set automatically.
(Auto-range operation)
Switches the range.
Touch panel
1
2
18
Changing the measurement speed
HIOKI DM7275A961-02
See “3.3 Setting the Measurement Speed” (p. 36).
Operating the Instrument
Operation key
Switches the measurement speed.
Touch panel
1
1
Overview
2
19
Operating the Instrument
HIOKI DM7275A961-02
Starting measurement
By default, the instrument is in the RUN state. In this state, measurement will continue
automatically.
Continuous measurement (default setting: RUN state)
See “Continuous measurement”(p. 37).
RUN state
Measurement will continue
automatically, and measurement
data will be saved in the instrument’s
internal memory.
Making measurements at the desired timing
See “Trigger measurement (measurement with user-specied timing)”(p. 38).
Starting measurement
Measurement can be started by either of the
following methods:
• While in the STOP state,
• While the trigger source is set to EXTERNAL,
send the TRIG signal to the instrument from
an external device.
Up to 5000 measured values can be saved in the instrument’s internal memory. Saved
measured values can be displayed in graph form to illustrate the trend in voltage readings
(trend display) or output to a USB ash drive.
After the set number of measurements (default
setting: 1) have been performed, measurement
will stop automatically.
Measurement data will be saved in the
instrument’s internal memory.
STOP state
Measurement will stop, and
the last measured value will be
saved.
20
How to Use This Manual
HIOKI DM7275A961-02
1.6 How to Use This Manual
This manual describes how to display Settings screens as included in the broken border below.
The indicated keys should be touched, starting on the Measurement screen.
Example: (Measurement screen) > MENU > MATH > COMP
1
Overview
1
3
2
21
How to Use This Manual
HIOKI DM7275A961-02
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