GRAPHTEC GL840 User manual
USER’S MANUAL
MANUAL NO.GL840-UM-151
GL840
i
To Ensure Safe and Correct Use
To Ensure Safe and Correct Use
•To ensure safe and correct use of the GL840, read this manual thoroughly before use.
•After having read this manual, keep it in a handy location for quick reference as needed.
•Do not permit small children to touch the GL840.
•The following describes important points for safe operation. Please be sure to observe them strictly.
Conventions Used in This Manual
To promote safe and accurate use of the GL840 as well as to prevent human injury and property damage,
safety precautions provided in this manual are ranked into the ve categories described below. Be sure you
understand the difference between each of the categories.
DANGER This category provides information that, if ignored, is
highly likely to cause fatal or serious injury to the operator.
WARNING This category provides information that, if ignored, is
likely to cause fatal or serious injury to the operator.
CAUTION This category provides information that, if ignored, could
cause physical damage to the GL840.
HIGH
TEMPERATURE
This category provides information that, if ignored, is
likely to cause burns or other injury to the operator due to
contact with high temperature.
ELECTRICAL
SHOCK
This category provides information that, if ignored, is
likely to expose the operator to electrical shock.
Description of Safety Symbols
The symbol indicates information that requires careful
attention (including warnings). The specic point requiring
attention is described by an illustration or text within or next to
the symbol.
The symbol indicates an action that is prohibited. Such
prohibited action is described by an illustration or text within or
next to the symbol.
The symbol indicates an action that must be performed.
Such imperative action is described by an illustration or text
within or next to the symbol.
ii
Safety Precautions
Safety Precautions
WARNING
Before turning on the GL840, ensure that the electric
socket’s supply voltage conforms to the GL840’s
power rating.
•Use of a different supply voltage may cause damage to the
GL840 or a fire hazard due to electrical
shock or current leakage.
If the GL840 generates smoke, is too hot, emits a
strange odor, or otherwise functions abnormally,
turn off its power and unplug its power cord from the
electrical socket.
•Use of the GL840 in such status may result in a fire hazard
or electrical shock.
•After checking that smoke is no longer being generated,
contact your sales representative or nearest Graphtec
vendor to request repair.
•Never try to perform repair yourself.
Repair work by inexperienced
personnel is extremely dangerous.
Never disassemble or remodel the GL840.
•Such action may cause a fire hazard due to electric shock
or current leakage.
•Contact with a high-voltage component inside the GL840
may cause electric shock.
•If repair is required, contact your
sales representative or nearest
Graphtec vendor.
Be sure to securely connect the GL840’s power cord.
•After checking that the power switch is turned off, connect
the power cord’s female plug to the GL840 and then
connect its male plug into the electrical socket.
•Before running the GL840 using a DC power supply, be
sure to ground the protective ground terminal ( ) to avoid
electrical shock and fire hazards. For grounding, use a
ground wire with a diameter of at least 0.75 mm2. When
using the GL840 in an environment where grounding is
not possible, ensure that the voltage to be measured is no
greater than 50 V (DC or rms).
Avoid using the GL840 in extremely dusty or humid
places.
•Such use may cause a fire hazard due to electrical shock or
current leakage.
Avoid using the GL840 in places where it may be
exposed to water such as bathrooms, locations
exposed to wind and rain, and so on.
•An electrical shock or fire may be caused due to current
leakage.
Prevent dust or metallic matter from adhering to the
power supply connector.
•Adhesion of foreign matter may cause a fire hazard due to
electrical shock or current leakage.
Never use a damaged power cord.
•Use of a damaged cord may result in a fire hazard due to
electrical shock.
•If the cord becomes damaged, order a new one to replace
it.
Ground the Machine Use prohibited
Use prohibited
Use prohibited No disassembly
Watch out for
electrical shock
Use prohibited Watch out for
electrical shock
Watch out for
electrical shock
Avoid water
Unplug the power
cord from the socket
iii
Safety Precautions
Safety Precautions
CAUTION
If uid or foreign matters enters inside the GL840,
turn off the power switch and disconnect the power
cord from the electrical socket.
•Use in such status may cause a fire hazard due to electrical
shock or current leakage.
•Contact your sales representative or nearest Graphtec
vendor to request repair.
To insert or disconnect the power cord or a signal
input cable, grasp the power cord’s plug or the signal
input cable’s connector.
•Pulling the cord/cable itself damages the cord/cable,
resulting in a fire hazard or electrical shock.
Do not use the GL840 in a location subject to
excessive mechanical vibration or electrical noise.
•Such location may impair the GL840’s performance.
Do not place coffee cups or other receptacles
containing uid on the GL840.
•Fluid spilling inside the GL840 may cause a fire hazard due
to electrical shock or current leakage.
Do not input voltage that exceeds the permissible
input voltage range that is specied on the GL840’s
label.
•Exceeding the specified voltage input range may cause
electrical shock or a fire hazard.
Do not use or store the GL840 in a location exposed to
direct sunlight or the direct draft of an air conditioner
or heater.
•Such location may impair the GL840’s performance.
Do not attempt to lubricate the GL840’s mechanisms.
•Such action may cause the GL840 to break down.
Never clean the GL840 using a volatile solvent (such
as thinner or benzine).
•Such action may impair the GL840’s performance.
•Clean off any soiled areas using a soft dry cloth.
Use prohibited
Use prohibited Use prohibited
Use prohibited
Use prohibited Use prohibited
Watch out for
electrical shock
Avoid water
Unplug the power
cord from the socket
iv
Safety Precautions
Safety Precautions
CAUTION
When using the wireless LAN (when option is
installed), please note the following:
•Turn off the device in places where wireless radio signal
use is restricted, such as on aircrafts and in hospitals. The
device can have an effect on electronic devices, medical
devices, etc., and may cause malfunctions.
When using the wireless LAN (when option is
installed) in a medical establishment, please note the
following rules:
•Please turn off the power of this product in hospital wards.
•Each medical institution has its own usage prohibitions in
various areas. Be sure to follow these.
When using the wireless LAN (when option is
installed), please note the following:
•In the event that the device has an effect on automatic
electronic devices such as cars or elevators, immediately
turn off the GL840.
When using the wireless LAN (when option is
installed), please note the following:
•
If you have an implantable pacemaker or implantable
defibrillator installed, radio signals from the device may have
an effect on the operation of your implantable pacemaker or
implantable defibrillator.
This GL840 is not meant for use with lifesaving devices or devices with mission-critical high reliability or
high safety requirements (medical devices, aerospace devices, shipping devices, nuclear power devices,
etc.). In the event that this GL840 causes injury or property damage when used under these circumstances,
the maker assumes absolutely no responsibility and is not liable.
Do not use the device in any way not specied in this
manual. There is a danger that protective provisions
will have not been put in place.
The module connection terminal is for use only with
separately sold sensors and modules. Do not connect
any other devices. Doing so may damage the GL840.
Strict observance
Strict observance
Use prohibited
Use prohibited
Use prohibited
Use prohibited
I
Introduction
Introduction
Thank you for purchasing the GL840 midi LOGGER.
Please read this manual thoroughly before attempting to use your new product to ensure that you use it correctly
and to its full potential.
Notes on Use
Be sure to read all of the following notes before attempting to use the GL840 midi LOGGER.
1. Note on the CE Marking
The GL840 midi LOGGER complies with the following standards.
• EN 61326-1 Class A standard based on the EMC directive (2014/30/EU)
• EN 61010-1:2010 3rd standard based on the LVD directive (2014/35/ EU)
• EN 301 489-17/-1, EN 300 328 standards based on the R&TTE directive (1999/5/EC)
Although the GL840 complies with the above-mentioned standards, be sure to use it correctly in accordance
with the instructions and notes provided in this manual.
Moreover, use of the GL840 by incorrect procedures may result in damage to the GL840 or may invalidate its
safeguards. Please conrm all of its notes regarding use and other related information to ensure correct use.
2. Warning
This is a Class A product according to the EMC directive. In a domestic environment, this product may cause
radio interference or may be affected by radio interference to the extent that proper measurement cannot be
performed.
3. Notes on Radio Law
When using the GL840 midi LOGGER in the wireless LAN (when option is installed), please note the
following:
Do not remove the technical standards compliance label. Do not use the device if it does not have a label
on it.
This GL840 uses the 2.4GHz frequency band.
The following devices and transmitters use the same frequencies and should not be used near this GL840:
• Microwave ovens
• Pacemakers and other industrial, science, and medical devices
• Radio transmitters used in mobile body identication devices on factory production lines, etc. (transmitters
requiring licensing)
• Specied low-power radio transmitters (transmitters not requiring licensing)
Communications may become slower or impossible due to radio interference.
The signal may be weak or communications may become slower or impossible depending on the
circumstances this GL840 is used in. Take particular note of steel-reinforced, metal, concrete, and other
structural materials that can inhibit radio waves.
II
Introduction
This GL840 is meant for use in Japan, the US, and Europe. It has not been certied for use under any other
country’s radio laws.
The following are each region’s certication marks.
Japan
US
Contains FCC ID: ANSBP3591
Europe..........CE Mark
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1)This device may not cause harmful interference, and (2)this device must accept any interference received,
including interference that may cause undesired operation.
FCC CAUTION
Change or modications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.
This transmitter must not be co-located or operated in conjunction with any other antenna or transmitter.
4. Notes for Safe Operation
(1) Be sure to use the Graphtec-supplied AC adapter. In environments where there is a lot of noise or where
the power supply is unstable, we recommend that you ground the GL840.
(2) When a high-voltage signal cable has been connected to the main unit’s analog signal input terminal,
avoid touching the leads of the input terminal’s signal cable to prevent electrical shock due to high voltage.
(3) Ensure that the GL840’s power source is positioned so that it can easily be disconnected.
(4) When connecting the high voltage signal line to the analog signal input terminal using the 4ch voltage/
temperature terminal on the separately sold module (GS-4VT), avoid touching the leads of the input
terminal’s signal line to prevent electrical shock due to high voltage.
5. Notes on Functions and Performance
(1) Be sure to connect the main unit to an AC or DC power supply that conforms to the rated range.
Connection to a non-rated power supply may cause the main unit to overheat and break down.
(2) Do not block the vent on the main unit.
Continued operation with the vent blocked may cause the main unit to overheat and break down.
(3) To avoid malfunctions and other damage, avoid using the GL840 in the following locations.
• Places exposed to high temperature and/or high humidity, such as in direct sunlight or near
heatingequipment.
(Allowable temperature range: 0 to 45°C (0 to 40°C when a battery pack is mounted, 15 to 35°C when
battery is being charged), Allowable humidity range: 5 to 85%R.H., non-condensing)
• Locations subject to excessive salt spray or heavy fumes from corrosive gas or solvents.
• Excessively dusty locations.
III
Introduction
• Locations subject to strong vibrations or shock.
• Locations subject to surge voltages and/or electromagnetic interference.
(4) If the main unit becomes soiled, wipe it off using a soft, dry cloth. Use of organic solvents (such as thinner
or benzene) causes deterioration and discoloration of the outer casing.
(5) Do not use the GL840 in the vicinity of other devices which are susceptible to electromagnetic
interference.
(6) Measured results may not conform to the stated specications if the GL840 is used in an environment
which is subject to strong electromagnetic interference.
(7) Insofar as possible, position the GL840 input signal cables away from any other cables which are likely to
be affected by electromagnetic interference.
(8) For stabilized measurement, allow the GL840 to warm up for at least 30 minutes after turning it on.
(9) When you want to use in combination of the Petit LOGGER GL100-WL (separately sold) and various
modules (such as GS sensor and terminal / adapter), please refer to the GL100 User’s Manual.
•When using in combination described above, please be careful to the operating environment because
the environmental conditions of the GL840 midi LOGGER are applied.
It may cause abnormal operation or damage.
• Allowable temperature range: 0 to 45°C, Allowable humidity range: 5 to 85%R.H, non-condensing.
(0 to 40°C when battery-powered / 15 to 35°C when charging)
When using temperature and humidity sensor (GS-TH) and the GL840 at the same time, the
operating environment of GL840 is applied.
•Temperature and Humidity Sensor (GS-TH):
• Humidity sensors measure the change in dielectric capacity of water adsorption. As a result, humidity
from organic materials such as ne particles or exhaust gas may have an effect on the sensor. Use
in environments with large quantities of these organic materials may lead to signicant measurement
inaccuracies.
•CO2 Sensor (GS-CO2 ):
• Because exhaled CO2 may have an effect on the sensor readings, do not use the sensor to take
measurements near the face.Additionally, should air ow to the sensor be blocked, it will result in
inaccurate readings, so be sure to keep vent holes open.
•Illumination / Ultraviolet Sensor (GS-LXUV):
• When measuring illumination or ultraviolet light that can have harmful effects on the eyes or skin, be
sure to use protective eyewear, shielding, etc.
• If the sensor becomes dirty, it may affect measurements, so wipe it with a soft cloth when it becomes
dirty.
• Take care to avoid cracking the sensor when handling it. If the sensor is damaged or cracked it may
affect measurements, so replace the sensor.
•Others
• Depending on the usage and operating environment of Temperature and Humidity Sensor (GS-
TH), CO2 Sensor (GS-CO2), and Illumination / Ultraviolet sensor (GS-LXUV), it is recommended to
replace periodically the sensor with new one because the sensor performance may be deteriorated.
• When connecting the GS-3AT (3-axis accelerometer) module to the GL840 midi LOGGER, please
note that IP54 standard is not satised.
IV
Introduction
Notes on the Use of This Manual
(1) All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in
any form or by any means, without the prior written permission of Graphtec Corporation.
(2) The specications and other information in this manual are subject to change without notice.
(3) While every effort has been made to supply complete and accurate information about this product, please
address any inquiries about unclear information, possible errors, or other comments to your sales representative
or nearest Graphtec vendor.
(4) Notwithstanding the preceding paragraph, Graphtec Corporation assumes no liability for damages resulting
from the use of the information contained herein or of the product.
About Registered Trademarks
Microsoft and Windows are registered trademarks or trademarks of Microsoft Corporation in the U.S. and
elsewhere.
Other company names and product names included in this manual are registered trademarks or trademarks of
their respective companies.
Copyright
All copyrights regarding this manual belong to Graphtec Corporation.
C-1
CONTENTS
CONTENTS
To Ensure Safe and Correct Use ................................................i
Safety Precautions...........................................................ii
Introduction .................................................................I
Notes on Use .................................................................I
Notes on the Use of This Manual ............................................... IV
About Registered Trademarks .................................................. IV
Copyright .................................................................. IV
CHAPTER 1 General Description
1.1 Overview.............................................................1-2
1.2 Features .............................................................1-2
1.3 Operating Environment.................................................1-3
Ambient Operating Conditions................................................. 1-3
Warming-up Before Use ..................................................... 1-3
Conguration When in Use ................................................... 1-4
1.4 Notes on Temperature Measurement .....................................1-5
1.5 Notes on Using the Monitor .............................................1-5
1.6 Changing the Display Language .........................................1-5
CHAPTER 2 Checks and Preparation
2.1 Checking the Outer Casing..............................................2-2
2.2 Checking the Accessories ..............................................2-2
2.3 Nomenclature and Functions ............................................2-3
2.4 Connecting the Power Cable and Turning on the Power ..................... 2-4
2.5 Connecting the Signal Input Cables ..................................... 2-6
2.6 Logic Alarm Cable Connection and Functions..............................2-8
2.7 Mounting the SD Memory Card .........................................2-11
2.8 Installing the Wireless LAN Unit (B-568: Option) ...........................2-14
2.9 Connecting to a PC ...................................................2-16
2.10 Using the Battery Pack (B-569 : Option) ..................................2-19
2.11 Connecting the Humidity Sensor (Optional)...............................2-21
2.12 Mounting and Removing the Standard Terminal and
Withstand high-voltage high-precision Terminal ...........................2-22
2.13 Mounting the Extension Terminal Base (Optional) and
Extension Terminal Cable (Optional) .....................................2-24
2.13.1 Mounting the extension terminal base...................................... 2-24
2.13.2 Mounting multiple extension terminals ..................................... 2-26
2.14 Precautions to Observe When Performing Measurement....................2-30
2.15 Noise Countermeasures ...............................................2-34
2.16 Connecting the Temperature and Humidity Sensor (GS-TH) (Optional) ........2-35
C-2
CONTENTS
2.17 Connecting the 3-axis Acceleration / Temperature Sensor (GS-3AT) (Optional) .2-36
2.18 Connecting the 4ch Voltage / Temperature Terminal (GS-4VT) (Optional) ......2-37
2.19 Connecting the 4ch Thermistor Terminal (GS-4TSR) (Optional).............. 2-40
2.20 Connecting the Illumination / Ultraviolet Sensor (GD-LXUV) (Optional) ....... 2-43
2.21 Connecting the CO2 Sensor (GS-CO2) (Optional) ......................... 2-44
2.22 Connecting the Adapter for AC Current Sensor (GS-DPA-AC) (Optional) ...... 2-45
2.23 Connecting the Branch Adapter for GS (GS-DPA) (Optional) .................2-47
2.24 When Fixing the GL840 Body .......................................... 2-50
2.25 Setting the Date and Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-51
CHAPTER 3 Settings and Measurement
3.1 Window names and functions ...........................................3-2
3.2 Key Operation ....................................................... 3-8
3.3 Operation Modes .....................................................3-17
3.4 Setting Menus .......................................................3-21
(1) AMP settings............................................................ 3-21
(2) DATA settings ...........................................................3-45
(3) TRIG settings ...........................................................3-50
(4) Interface settings ........................................................3-56
(5 ) WLAN setting ..........................................................3-61
(6) OTHER settings.........................................................3-69
(7) FILE menu ............................................................. 3-73
(8) File box ................................................................ 3-77
(9) Text input .............................................................. 3-79
(10) Data replay menu .......................................................3-80
(11) NAVI menu ............................................................3-84
(12) Quick setting ...........................................................3-86
(13) To cancel key lock by password ............................................3-87
3.5 WEB Server Function ................................................ 3-88
3.6 List of Error Codes .................................................. 3-92
CHAPTER 4 Specication
4.1 Standard Specications ................................................4-2
Standard Specications...................................................... 4-2
Memory devices............................................................ 4-3
PC I/F.................................................................... 4-3
Monitor................................................................... 4-3
Standard terminal input section (GL840-M and B-564).............................. 4-4
Withstand high-Voltage high-precision terminal input section (GL840-WV: B-565) ........ 4-6
4.2 Function Specications ............................................... 4-8
Function Specications ...................................................... 4-8
Trigger/Alarm Functions...................................................... 4-8
External Input/Output Functions ............................................... 4-9
C-3
CONTENTS
4.3 Accessories/Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
Control Software .......................................................... 4-10
Accessories .............................................................. 4-10
Wireless Unit B-568 (Option)................................................. 4-10
Battery Pack B-569 (Option) ..................................................4 -11
Humidity Sensor B-530 (Option) ...............................................4-11
List of Options ............................................................ 4-12
4.4 External Dimensions ..................................................4-13
INDEX ..............................................I-1
1-2
CHAPTER 1 General Description
1.1 Overview
The GL840 is a compact, lightweight, multi-CH, and multi-purpose data logger with a 7-inch color display.
20CH measurements are available with the standard terminal or Withstand high-voltage high-precision
terminal, and 200CH measurements are available with the extension terminal base. In addition, when
connecting various modules, the voltage, temperature and humidity as well as the acceleration, AC current,
CO2, and illuminance / ultraviolet etc. can be measured.
The GL840 is compatible with the SD memory card. The high-capacity measurement data can be saved in
the SD memory card that has various storage capacities.
For the PC interface, as USB and Ethernet is included as standard, system conguration according to use
is possible. As the Ethernet function is equipped with both WEB server and FTP server functions, remote
supervision and data transfer are also possible. In addition, when the wireless LAN and Petit LOGGER
GL100-WL are combined by installing the wireless unit, the multipurpose remote measurement is also
possible.
1.2 Features
Input
•Adoption of a pluggable M3 screw type input terminal facilitates wiring.
•20CH measurements are supported by the standard terminal or Withstand high-voltage high-precision
terminal, and 200CH measurements are supported by the extension terminal base.
• When using the Graphtec’s GS series and terminal / adapter, the acceleration, AC current, CO2, and
illuminance / ultraviolet measurements are also possible.
• Because that standard terminal and Withstand high-voltage high-precision terminal have a whole CH
isolated, the different standard signals can be measured at the same time. In addition, when using the
Withstand high-voltage high-precision terminal, the measure environmental conditions of high withstand
voltage can be applied.
Display & Operation
• With the GL840’s high-resolution 7-inch TFT color liquid crystal display, you can conrm the waveforms of
measured data and each channel’s settings at a glance.
•Easy operation is achieved through a straightforward menu structure and key allocation which resembles
mobile phones.
Data Capture
• Data is directly saved to the large SD memory card (Standard accessory: 4GByte).
•There two mounting slots for the SD memory card, and long-term measurement can be performed while
backing up the data.
* When the optional wireless LAN unit is installed, the SD memory card cannot be inserted into the SD
CARD2 slot.
• Because disk image can be used for the SD memory card , multiple data can be saved.
•The new ring memory capture function maintains latest data even after capturing for a long term. (You
need to set how long you want to keep data.)
•For voltage, temperature and humidity measurements, data can be captured at sampling rates of up to
10 msec per channel by using fewer measuring channels. (Temperature measurement can be done at
sampling rates of 100 msec and higher.)
• The GL840 is equipped with the relay recording function, and 2GByte or more data can be saved by
switching the to the other le without data missing. (When the capacity of one le reaches 2GByte, the le
is switched.)
1-3
CHAPTER 1 General Description
Data Control & Processing
•The application software provided lets you set conditions and monitor data on a PC.
• The USB drive mode function enables the SD memory card to be recognized as an external drive by the
PC.
(Connect the GL840 to the PC and turn on the GL840 power while holding down the [START] key.)
• The WEB server function enables control and monitoring from a remote location without using dedicated
software
•The FTP client function enables backup of measurement data to the FTP server.
•The NTP client function enables synchronization of the time with the NTP server.
•When optional wireless LAN unit is installed, the data capture can be performed remotely by controlling
th e GL10 0 -W L.
1.3 Operating Environment
This section explains the operating environment for the GL840.
Ambient Operating Conditions
(1)Ambient temperature and humidity (the GL840 must be operated within the following ranges.)
• Temperature range: 0 to 45°C (0 to 40°C when a battery pack is mounted, 15 to 35°C when battery is
being charged)
• Humidity range: 5 to 85%R.H.
(2) Environment (do not use in the following locations.)
• A Location such as being exposed to direct sunlight
• Locations exposed to salty air, corrosive gases, or organic solvents
• Dusty locations
• Locations subject to vibration or impact
• Locations subject to voltage surge or electromagnetic interference such as lightning or electric furnaces
(3) Installation category (over-voltage category)
• The GL840 belongs to Installation Category II dened in IEC60664-1.
• Never use the GL840 for Installation Category III or IV.
(4) Measurement category
• The standard terminals on the GL840 are not used for Measurement Category II, III, and IV.
• The Withstand high-voltage high-precision terminal for the GL840 belongs to Category II. However, it is
not available for Category III or IV.
•If condensation occurs...
Condensation occurs in the form of water droplets on the device surfaces and interior when the GL840
is moved from a cold to a warm location. Using the GL840 with condensation will cause malfunctioning.
Wait until the condensation has disappeared before turning on the power.
Warming-up Before Use
The GL840 should be allowed to warm up with the power turned on for approximately 30 minutes to ensure
that it operates according to the specied performance.
1-4
CHAPTER 1 General Description
Conguration When in Use
Do not use the GL840 standing upright or at an angle. It must always be laid at.
<Usage Conguration>
Do not block the air vent on the GL840, as this will cause malfunctioning.
Measurement accuracy may not be satisfactory if the system is used in a condition other than described
above.
1-5
CHAPTER 1 General Description
1.4 Notes on Temperature Measurement
Please observe the following precautions when performing temperature measurement.
•Do not block the air vents. Always provide a space of at least 30 cm on all sides of the GL840.
•For stabilized temperature measurement, allow the GL840 to warm up for at least 30 minutes after turning
it on.
•Exposure of the input terminals to direct drafts, direct sunlight, or abrupt changes in temperature may
impair the equilibrium of the input parts and result in measurement errors. To measure temperature in
such an environment, take appropriate countermeasures such as changing the installation site of the
GL840.
• To conduct measurement in noisy environments, connect the GL840’s GND terminal to ground (Refer to
“2.15 Noise Countermeasures”.).
• If measured values uctuate due to noise, set to a slower sampling speed (Refer to “(2) DATA setting” in “3.4
Setting Menus”.).
1.5 Notes on Using the Monitor
The monitor is an LCD display unit, and so the display will vary depending on the operating environment.
If the screen saver function is used, it will operate and clear the screen if no operations are performed
during the preset time. If the screen saver operates, press any key to restore the display.
•Condensation may form on the LCD screen if the GL840 is moved from a cold to a warm location. If this
occurs, wait until the LCD screen warms up to room temperature.
•The LCD screen is manufactured to extremely high precision. Black dots may appear, or red, blue, and
green dots may not disappear. Likewise, streaks may appear when viewed from certain angles. These
phenomena are due to the LCD screen construction, and are not signs of a fault.
1.6 Changing the Display Language
You can choose the language displayed on the screen. The default display language is set to English when
the GL840 is shipped overseas. To change the display language, see the instructions in "OTHER:Language".
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