GRAPHTEC GL820 User manual

USER’S MANUAL
MANUAL NO.GL820-UM-151
GL820

I
Introduction
Introduction
Thank you for purchasing the GL820 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 GL820 midi LOGGER.
1. Note on the CE Marking
The GL820 complies with the EN61326-1 Class A standard based on the EMC directive (89/336/EEC).
It also conforms to the EN61010-1 standard based on the LV directive (72/23/EEC).
Although the GL820 complies with the above-mentioned standards, be sure to use it correctly in accordance with the
instructions and notes provided in its User’s Manual.
Moreover, use of the GL820 by incorrect procedures may result in damage to the GL820 or may invalidate its
safeguards. Please confirm 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 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 GL820.
(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 GL820’s power source is positioned so that it can easily be disconnected.
4. 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 GL820 in the following locations.
• Placesexposedtohightemperatureand/orhighhumidity,suchasindirectsunlightornearheatingequipment.
(Operating range - Temperature: 0 to 45°C (0 to 40°C when battery pack is mounted), Humidity: 5 to 85% RH)
• Locationssubjecttoexcessivesaltsprayorheavyfumesfromcorrosivegasorsolvents.
• Excessivelydustylocations.
• 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 GL820 in the vicinity of other devices which are susceptible to electromagnetic interference.
(6) Measured results may not conform to the stated specifications if the GL820 is used in an environment which is
subjecttostrongelectromagneticinterference.

II
Introduction
(7) Insofar as possible, position the GL820 input signal cables away from any other cables which are likely to be
affected by electromagnetic interference.
(8) For stabilized measurement, allow the GL820 to warm up for at least 30 minutes after turning it on.
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.

i
To Ensure Safe and Correct Use
To Ensure Safe and Correct Use
● To ensure safe and correct use of the GL820, 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 GL820.
● 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 GL820 as well as to prevent human injury and property
damage,safety precautions provided in this manual are ranked into the five categories described below. Be
sure you understand the difference between each of the categories.
Description of Safety Symbols
The symbol indicates information that requires careful attention
(which includes warnings). The point requiring attention is described
by an illustration or text within or next to the symbol.
The symbol indicates action that is prohibited. Such prohibited action
is described by an illustration or text within or next to the symbol.
The symbol indicates action that must be performed. Such
imperative action is described by an illustration or text within or next to
the symbol.
This category provides information that, if ignored, is highly
likely to cause fatal or serious injury to the operator.
DANGER
This category provides information that, if ignored, is likely to
cause fatal or serious injury to the operator.
WARNING
This category provides information that, if ignored, could
cause physical damage to the GL820.
CAUTION
This category provides information that, if ignored, is likely
to cause burns or other injury to the operator due to contact
with high temperature.
HIGH
TEMPERATURE
This category provides information that, if ignored, is likely to
expose the operator to electrical shock.
ELECTRICAL
SHOCK

ii
Safety Precautions
If the GL820 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 GL820 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.
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.
Avoid using the GL820 in places where it may be
exposed to water such as bathrooms, locations exposed
to wind and rain, and so on.
Never disassemble or remodel the GL820.
●Such action may cause a fire hazard due to electric shock or
current leakage.
●Contact with a high-voltage component inside the GL820 may
cause electric shock.
●If repair is required, contact your
sales representative or nearest
Graphtec vendor.
Safety Precautions
WARNING
Be sure to securely connect the GL820’s power cord.
●After checking that the Power switch is turned off, connect
the power cord’s female plug to the GL820 and then
connect its male plug into the electrical socket.
●Use of the GL820 without the power cord securely plugged
into the electrical socket may result in electrical shock due
to current leakage.
●Before running the GL820 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 GL820
in an environment where grounding is not possible, ensure
that the voltage to be measured is no greater than 50 V (DC
or rms).
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.
Avoid using the GL820 in extremely dusty or humid
places.
●Such use may cause a fire hazard due to electrical shock or
current leakage.
Securely connect the power cord
Make sure that the socket has a
good protective ground
Amateur repairprohibited
Use of a differentsupply
voltageprohibited
No disassembly
Use prohibited Watch out for
electrical shock Avoid water Watch out
electrical shock
No foreign matter Watch out for
electrical shock
Unplug the power
cord from the socket
Before turning on the GL820, ensure that the electric
socket’s supply voltage conforms to the GL820’s power
rating.
●Use of a different supply voltage may cause damage to the
GL820 or a fire hazard due
to electrical shock or current
leakage.

iii
Safety Precautions
Do not use or store the GL820 in a location exposed to
direct sunlight or the direct draft of an air conditioner or
heater.
●Such location may impair the GL820’s performance.
Do not use the GL820 in a location subject to excessive
mechanical vibration or electrical noise.
●Such location may impair the GL820’s performance.
Safety Precautions
CAUTION
If fluid or foreign matters enters inside the GL820, 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.
Do not place coffee cups or other receptacles containing
fluid on the GL820.
●Fluid spilling inside the GL820 may cause a fire hazard due
to electrical shock or current leakage.
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 attempt to lubricate the GL820’s mechanisms.
●Such action may cause the GL820 to break down.
Never clean the GL820 using a volatile solvent (such as
thinner or benzine).
●Such action may impair the GL820’s performance.
●Clean off any soiled areas using a soft dry cloth.
Do not input voltage that exceeds the permissible input
voltage range that is specified on the GL820’s label.
●Exceeding the specified voltage input range may cause
electrical shock or a fire hazard.
Storage/Use prohibited Avoid water Watch out
electrical shock
Use prohibited No pulling
Unplug the power
cord from the socket
No lubrication No volatile solvents
Use prohibited

iv
Safety Precautions
Memo

C-1
CONTENTS
CONTENTS
Introduction......................................................................................................................................................... I
Notes on Use ...................................................................................................................................... I
About Registered Trademarks............................................................................................................ II
To Ensure Safe and Correct Use........................................................................................................................ i
Conventions Used in This Manua........................................................................................................ i
Description of Safety Symbols ............................................................................................................ i
Safety Precautions ............................................................................................................................................ ii
1 General Description .................................................................................1−1
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
Configuration When in Use ............................................................................................................1−3
1.4 Notes on Temperature Measurement ..................................................................................................1−4
1.5 Notes on Using the Monitor .................................................................................................................1−4
1.6 Changing the Display Language..........................................................................................................1−4
2 Checks and Preparation ..........................................................................2−1
2.1 Checking the Outer Casing..................................................................................................................2−2
2.2 Checking the Accessories ...................................................................................................................2−2
2.3 GL820 Nomenclature and Functions ...................................................................................................2−3
2.4 Connecting the Power Cable and Turning on the Power......................................................................2−4
Connecting to an AC Power Supply ...............................................................................................2−4
Connecting to a DC Power Supply.................................................................................................2−5
2.5 Connecting the Signal Input Cables ....................................................................................................2−6
Terminal Configuration and Signal Types .......................................................................................2−6
Connection diagram .......................................................................................................................2−6
2.6 Logic Alarm Cable Connection and Functions.....................................................................................2−7
Internal equivalent circuit of I/O circuit ...........................................................................................2−8
2.7 Attaching USB Memory .....................................................................................................................2−10
Inserting a USB Memory..............................................................................................................2−10
2.8 Connecting to a PC............................................................................................................................2−11
Connection Using a USB Cable...................................................................................................2−11
LAN Connection...........................................................................................................................2−12
2.9 Using the Battery Pack (B-517: Option) .............................................................................................2−13
Mounting the Battery Pack ...........................................................................................................2−13
Charging the Battery ....................................................................................................................2−14
2.10 Connecting the Humidity Sensor (Option) .........................................................................................2−15
2.11 Mounting and Removing the Terminal Unit ........................................................................................2−16
To Remove ...................................................................................................................................2−16
To Mount ......................................................................................................................................2−17
2.12 Mounting the Extension Terminal Base Set (B-537) ..........................................................................2−18
B-537 Set Contents......................................................................................................................2−18
To Mount ......................................................................................................................................2−18
2.13 Mounting the 20 Channel Extension Terminal Set (B-538) ................................................................2−19
B-538 Set Contents......................................................................................................................2−19
To Mount ......................................................................................................................................2−19
2.14 Precautions to Observe When Performing Measurement..................................................................2−21
2.15 Noise Countermeasures ....................................................................................................................2−22
2.16 Setting the Date and Time .................................................................................................................2−23

C-2
CONTENTS
How to Recharge the Rechargeable Battery................................................................................2−23
How to Set the Date and Time .....................................................................................................2−23
3 Settings and Measurement......................................................................3−1
3.1 Window names and functions..............................................................................................................3−2
3.2 Key Operation ......................................................................................................................................3−6
(1) CH GROUP ..............................................................................................................................3−6
(2) SPAN/TRACE/POSITION .........................................................................................................3−7
(3) TIME/DIV ..................................................................................................................................3−7
(4) MENU .......................................................................................................................................3−7
(5) QUIT(LOCAL) ...........................................................................................................................3−8
(6) Direction keys ...........................................................................................................................3−8
(7) ENTER......................................................................................................................................3−8
(8) FAST FORWARD key (KEY LOCK)..........................................................................................3−9
(9) START/STOP(USB Drive Mode)...............................................................................................3−9
(10) REVIEW................................................................................................................................3−10
(11) DISPLAY...............................................................................................................................3−11
(12) CURSOR(ALARM CLEAR) ..................................................................................................3−12
(13) FILE ......................................................................................................................................3−12
(14) NAVI......................................................................................................................................3−13
3.3 Operation Modes ...............................................................................................................................3−14
(1) Free Running ..........................................................................................................................3−14
(2) Capturing ................................................................................................................................3−15
(3) Dual View Replaying...............................................................................................................3−15
(4) Replaying................................................................................................................................3−16
3.4 Setting Menus....................................................................................................................................3−17
3.5 WEB Server Function ........................................................................................................................3−52
4 Specification ............................................................................................4−1
4.1 Standard Specifications .......................................................................................................................4−2
Standard Specifications .................................................................................................................4−2
Internal memory devices................................................................................................................4−3
PC Interface ...................................................................................................................................4−3
Monitor ...........................................................................................................................................4−3
Input Unit Specifications.................................................................................................................4−4
4.2 Function Specifications........................................................................................................................4−5
Function Specifications ..................................................................................................................4−5
Trigger Functions............................................................................................................................4−5
External Input/Output Functions ....................................................................................................4−6
4.3 Accessory/Option Specifications .........................................................................................................4−7
Control Software ............................................................................................................................4−7
Accessorie .....................................................................................................................................4−7
Battery Pack B-517 (Option) ..........................................................................................................4−7
Humidity Sensor B-530 (Option) ....................................................................................................4−8
List of Options ................................................................................................................................4−8
4.4 External Dimensions............................................................................................................................4−9
Index ........................................................................................................... S−1

CHAPTER 1 General Description
This chapter provides a general description of the GL820 and its features.
1.1 Overview
1.2 Features
1.3 Operating Environment
1.4 Notes on Temperature Measurement
1.5 Notes on Using the Monitor
1.6 Changing the Display Language

1−2
CHAPTER 1 General Description
1.1 Overview
The GL820 (with color monitor and internal memory) are compact, lightweight, multi-channel data loggers.
GL820 are provided with 20 channels as a standard measurement feature, or can be extended up to 200
channels by attaching additional terminal sets.
GL820 are also equipped with an internal flash memory to store data and enable the direct capture of a large
volume of data to USB memory.
Furthermore, the data loggers are equipped with USB and Ethernet interfaces to a PC to enable system
configurations according to your application.
The Ethernet feature includes WEB and FTP server functions which allow monitoring from a remote location
and data transfer.
1.2 Features
Input
●Adoption of a pluggable M3 screw type input terminal facilitates wiring.
●The GL820 is provided with 20 channels as a standard measurement feature, or can be extended up to
200 channels by attaching additional terminal sets.
●All channels are isolated, enabling measurement of signals of different references.
Display & Operation
●With the GL820’s high-resolution 5.7-inch TFT color liquid crystal display, you can confirm 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 can be directly captured and maintained in the internal or USB memory.
●The high-capacity internal memory enables measurement for a long term without the use of USB
memory.
●Internal memory used for the built-in memory maintains captured data even after the power is turned off.
●The Internal memory can be used with disk images thus multiple data items can be maintained.
●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 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.)
Data Control & Processing
●The application software provided lets you set conditions and monitor data on a PC.
●The USB drive mode function enables the GL820’s internal memory to be recognized as an external
drive by your PC. (Connect the GL820 to your PC and turn on the power supply to the GL820 while
holding down the [START] key.)
●Captured data can be read from the application software to files and displayed for processing.
●Data can be transferred off-line to a computer using USB memory.
●The WEB server function enables control and monitoring from a remote location without using
dedicated software.
●The FTP server function enables handling internal memory and USB memory data from a PC.
●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.

1−3
CHAPTER 1 General Description
1.3 Operating Environment
This section explains the operating environment for the GL820.
Ambient Operating Conditions
(1) Ambient temperature and humidity (the GL820 must be operated within the following ranges.)
 •Temperaturerange:0to45°C(0to40°Cwhenabatterypackismounted.)
 •Humidityrange:5to85%RH
(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GL820belongstoInstallationCategoryIIdenedinIEC60664-1.
 •NeverusetheGL820forInstallationCategoryIIIorIV.
(4)Measurementcategory
 •TheGL820belongstoMeasurementCategoryIdenedinIEC61010.
 •TheGL820cannotbeusedforMeasurementCategoryII,III,orIV.
If condensation occurs...
Condensation occurs in the form of water droplets on the device surfaces and interior when the GL820 is
moved from a cold to a warm location. Using the GL820 with condensation will cause malfunctioning.
Wait until the condensation has disappeared before turning on the power.
Warming-up Before Use
The GL820 should be allowed to warm up with the power turned on for approximately 30 minutes to ensure
that it operates according to the specified performance.
Configuration When in Use
Do not use the GL820 standing upright or at an angle. It must always be laid flat.
Usage Configuration
Do not block the air vent on the GL820, as this will cause malfunctioning.
Measurement accuracy may not be satisfactory if the system is used in a condition other than described
above.

1−4
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 GL820.
●For stabilized temperature measurement, allow the GL820 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
GL820.
●To conduct measurement in noisy environments, connect the GL820’s GND terminal to ground (refer to
page 2-21).
●If measured values fluctuate due to noise, set to a slower sampling speed (refer to page 3-19).
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 GL820 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GL820isshippedoverseas.Tochangethedisplaylanguage,seetheinstructionsin"OTHER:Language".

CHAPTER 2 Checks and Preparation
This chapter explains how to check the GL820's external casing andaccessories,
and how to prepare the GL820 for operation.
2.1 Checking the Outer Casing
2.2 Checking the Accessories
2.3 GL820 Nomenclature and Functions
2.4 Connecting the Power Cable and Turning on
the Power
2.5 Connecting the Signal Input Cables
2.6 Logic Alarm Cable Connection and Func-
tions
2.7 Attaching USB Memory
2.8 Connecting to a PC
2.9 Using the Battery Pack (the B-517 Option)
2.10 Connecting the Humidity Sensor (Option)
2.11 Mounting and Removing the Terminal Unit
2.12 Mounting the Extension Terminal Base Set
(B-537)
2.13 Mounting the 20 Channel Extension Terminal
Set (B-538)
2.14 Precautions to Observe When Performing
Measurement
2.15 Noise Countermeasures
2.16 Setting the Date and Time

2−2
CHAPTER 2 Checks and Preparation
2.1 Checking the Outer Casing
After unpacking, check the GL820's outer casing before use. In particular, please check for the following:
●Surface scratches
●Other flaws such as stains or dirt
2.2 Checking the Accessories
After unpacking, check that the following standard accessories are included.
Standard Accessories
Item Remarks Quantity
Quick Start Guide GL820-UM-85x 1
CD-ROM User's Manual, Application software 1
AC cable/AC adapter 100 to 240 VAC, 50/60 Hz 1
Optional Accessories
Item Option number Remarks
Logic alarm cable B-513 2m, Bare tips
DC drive cable B-514 2m, Bare tips
Battery pack B-517 7.4V/2200mAh 17Wh
Humidity sensor *1 B-530 3 m, with dedicated power connector
midi LOGGER carrying case *2 B-536
Extension terminal base set B-537 Extension terminal base unit, cable
20 channel extension terminal set B-538 20 channel terminals, extension terminal base unit, con-
nection plate, screws
DIN rail jig for GL820 main unit *3 B-539 Built to order
DIN rail jig for GL820 extension
terminal *3
B-540 Built to order
Humidity sensor power box B-542 For connection with 10 humidity sensors: Built to order
M3 screws with flat washers (60) B-543 60 per set
USB memory 2GB B-550 2GB
Shunt resistor 250 ΩB-551 250 Ω, Rated power of 1 W, Maximum service voltage of
15.8 V, Built to order
T-type thermocouple *2 JSB-7115-5M-T 5-m length, 5 thermocouples per set, wire diameter of
0.32, 1.0 x 1.6 x 5000 mm
K-type thermocouple *2 JSB-7115-5M-K 5-m length, 5 thermocouples per set, wire diameter of
0.32, 1.0 x 1.6 x 5000 mm
Extra fine K-type the rmocouple
(TC200/TD1000), 5 per set
ST-55K-TC-1.2M Tip wire diameter of 0.127, 0.5 x 0.7 x 200 mm, Relay
part 1 m, 5 per set
Needle-shape K-type thermo-
couple
RIC-410 -100 to 300°C, Class 1, Cord length: 1.1 m
Stationery-surface K-type thermo-
couple
RIC-420 -30 to 400°C, Class 2, Cord length: 1.1 m
L-type stationery-surface K-type
thermocouple
RIC-430 -30 to 600°C, Class 2, Cord length: 1.1 m
Mini-connector for K-type thermo-
couple (5 per set)
RIC-440 5 per set, Connectable thermocouple: Wire diameter of
0.65 mm, End terminal: M3Y terminal
Mini-connector for K-type thermo-
couple (2 per set)
RIC-441 2 per set, Connectable thermocouple: Wire diameter of
0.65 mm, End terminal: M3Y terminal
Mini-connector for T-type thermo-
couple (5 per set)
RIC-450 5 per set, Connectable thermocouple: Wire diameter of
0.65 mm, Terminal: M3Y terminal
Mini-connector for T-type thermo-
couple (2 per set)
RIC-451 2 per set, Connectable thermocouple: Wire diameter of
0.65 mm, End terminal: M3Y terminal
*1: Allowable temperature range: -25 to +80°C
*2: Sold only in Japan.
*3: Can be used also for the GL800 and GL900.

2−3
CHAPTER 2 Checks and Preparation
2.3 GL820 Nomenclature and Functions
This section describes the names and function of parts of the GL820.
PC interface terminals
• USB
• LAN
Monitor Operation status LED
• POWER : ON when the power is ON
• START : ON during data capture
• CHARGE : ON while the battery is charging
Power switch
Control panel keys
Analog signal
input terminals
USB memory terminal
AC adapter jack
GND terminal
Power jack for the humidity sensor
(Humidity sensor is the option B-530)
External input/output terminals
• LOGIC/PULSE
• EXT TRIG/SAMPLE
• ALARM
Logic alarm cable (When using the B-513 option)
Label
Battery cover
T w o battery pack can be installed
(Battery pack is the option B517)

2−4
CHAPTER 2 Checks and Preparation
2.4 Connecting the Power Cable and Turning on the Power
This section describes how to connect the power cable and turn on the power. The connection method will
vary depending on the type of power supply used.
Connecting to an AC Power Supply
Use the AC cable and AC adapter that are provided as accessories.
Be sure to use the AC adapter that is supplied as a standard accessory.
(1) Plug the AC cable into the AC adapter.
AC adapter
AC cable
(2) Connect the output side of the AC adapter to the connector on the GL820.
AC adapter cable
(3) Using the flat-blade screwdriver, press against the minus (-) button above the GND terminal, while
connecting the grounding cable to the GL820. Connect the other end of the cable to ground.
(4) Plug the AC cable into the mains power outlet.
(5) Press the power switch on the GL820 to the ON side to turn on the power.
Always connect the GND terminal and refer to the safety precautions. The GL820 must be grounded even
when connected to other devices and sharing a common ground level.

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CHAPTER 2 Checks and Preparation
Connecting to a DC Power Supply
Use the optional DC drive cable (B-514).
Use a power supply within the 8.5 to 26.4 VDC range.
(1) Configure the tip of the DC drive cable (B-514: 2m) to enable it to be connected to the DC power
supply.
(2) Connect the DC output side to the power supply connector on the GL820.
Shielded lead (- side)
White (+ side)
DC drive cable
(B-514: Option)
(3) Connect the DC input side to the DC power supply.
Be sure to check the polarity of the wire tips when performing wiring.
(4) Press the power switch on the GL820 to the ON side to turn on the power.

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CHAPTER 2 Checks and Preparation
2.5 Connecting the Signal Input Cables
This section describes how to connect the signal input cables.
Terminal Configuration and Signal Types
＋
−
b
CH1 CH20
Connection diagram
DC voltage input Thermocouple input
Voltage input
Compensationcopper wire
Resistance temperature detector input Current input
Lead wire resistance should
be 10Ωor less per wire,
three wires need to be same length.
A
B
bb
Shunt resister
Ex: The current is converted to the voltage in
the shunt register.
For 4 to 20mA current input, installing 250
ohms (0.1%) resister for converting 1 to 5V.
* 250 ohms shunt register is the option B551.
Direct current
+......................................High-voltage terminal (terminal for high-voltage input signals)
– ......................................Low-voltage terminal (terminal for low-voltage input signals)
b ......................................Dedicated terminal when connecting resistance temperature detector
* Resistance temperature detector input terminals A (+) and B (-) are isolated within each channel. Terminal b is shorted
within all channels.
Item Description
Input configuration Isolated input, scanning
Analog voltage 20, 50, 100, 200, 500 mV/F.S.; 1, 2, 5, 10, 20, 50 V/F.S.; 1-5V
Thermocouples K, J, E, T, R, S, B, N, W (WRe 5-26)
Resistance temperature detector PT100, JPT100, PT1000 (IEC751)
A/D resolution 16-bit (Effective resolution: About 1/40,000 of the +/- range)
Filter Off, 2, 5, 10, 20, 40
Filter operation is on a moving average basis.
The average value of the set sampling count is used.
If the sample interval exceeds 30 seconds, the average value of data ob-
tained in a sub-sample (30 seconds) is used.

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CHAPTER 2 Checks and Preparation
2.6 Logic Alarm Cable Connection and Functions
The logic alarm cable (B-513: Option) enables logic/pulse input, external trigger input, and alarm signal output.
Connect the logic alarm cable (B-513: Option) to the external input/output terminal as shown below.
Logic alarm cable (B-513: Option)
Logic/Pulse Specifications
Item Description
Number of input channels 4
Input voltage range 0 to +24V max. (single-ended ground input)
Threshold level Approx. +2.5V
Hysteresis Approx. 0.5 V (+2.5 to +3 V)
*Switch between logic and pulse input.
Trigger Input Specifications
Item Description
Number of input channels 1
Input voltage range 0 to +24V max. (single-ended ground input)
Threshold level Approx. +2.5V
Hysteresis Approx. 0.5 V (+2.5 to +3 V)
Alarm Output Specifications
Item Description
Number of Output channels 4
Output format Open collector output
+5 V, 10 KΩpull-up resistance
* See the next page for details on alarm output.