A&D GX-8000 User Manual

GX SERIES

GX-200/GX-300/GX-400

GX-600/GX-800/GX-1000

X-2000/GX-3000/GX-4000/GX-6100

GX-6000/GX-8000

Multi-Function Balance

INSTRUCTION MANUAL

1WMPD4000087D

No part of this publication may be reproduced, transmitted, transcribed, or translated

into any language in any form by any means without the written permission of A&D

Company Ltd.

The contents of this manual and the specifications of the instrument covered by this

manual are subject to change for improvement without notice.

Windows, Word and Excel are registered trademarks of the Microsoft Corporation.

CONTENTS

Basic Operation

1. INTRODUCTION .............................................................................................................................3

1-1 About This Manual .............................................................................................................................. 3

1-2 Features ............................................................................................................................................. 3

1-3 Compliance......................................................................................................................................... 4

2. UNPACKING THE BALANCE ........................................................................................................6

2-1 Unpacking........................................................................................................................................... 6

2-2 Installing the Balance ......................................................................................................................... 7

3. PRECAUTIONS ..............................................................................................................................8

3-1 Before Use.......................................................................................................................................... 8

3-2 During Use.......................................................................................................................................... 9

3-3 After Use........................................................................................................................................... 10

3-4 Power Supply ................................................................................................................................... 10

4. DISPLAY SYMBOLS AND KEY OPERATION..............................................................................11

5. WEIGHING UNITS ........................................................................................................................12

5-1 Units.................................................................................................................................................. 12

5-2 Storing Units ..................................................................................................................................... 15

Adapting to the Environment

6. WEIGHING ....................................................................................................................................17

6-1 Basic Operation (Gram Mode) ......................................................................................................... 17

6-2 Counting Mode (PC)......................................................................................................................... 18

6-3 Percent Mode (Pct)........................................................................................................................... 20

6-4 Animal Weighing Mode (Hold Function)........................................................................................... 21

7. RESPONSE ADJUSTMENT / SELF CHECK FUNCTION............................................................22

7-1 Automatic Response Adjustment / Self Check Function .................................................................. 22

7-2 Manual Response Adjustment.......................................................................................................... 23

8. CALIBRATION ..............................................................................................................................24

8-1 Calibration Group ............................................................................................................................. 24

8-2 Automatic Self Calibration (Calibration due to changes in temperature)................................... 25

8-3 Calibration Using the Internal mass (One-Touch Calibration) .................................................... 25

8-4 Calibration Using an External Weight............................................................................................... 26

8-5 Calibration Test Using an External Weight ....................................................................................... 28

8-6 Correcting the Internal Mass Value .................................................................................................. 30

Functions

9. FUNCTION SWITCH AND INITIALIZATION.................................................................................32

9-1 Permit or Inhibit ................................................................................................................................ 32

9-2 Initializing the Balance...................................................................................................................... 33

10. FUNCTION TABLE .....................................................................................................................34

10-1 Structure and Sequence of the Function Table .............................................................................. 34

10-2 Display and Keys............................................................................................................................ 34

10-3 Details of the Function Table .......................................................................................................... 35

10-4 Description of the Class “Environment, Display” ............................................................................38

10-5 Description of the Item “Data output mode” ................................................................................... 40

10-6 Description of the Item “Data format” ............................................................................................. 41

10-7 Description of the Data Format Added to the Weighing Data ............................................................... 43

10-8 Data Format Examples................................................................................................................... 44

10-9 Clock and Calendar Function ......................................................................................................... 46

10-10 Comparator Function.................................................................................................................... 48

11. ID NUMBER AND GLP REPORT................................................................................................50

11-1 Setting the ID Number .................................................................................................................... 50

11-2 GLP Report ..................................................................................................................................... 51

12. DATA MEMORY ..........................................................................................................................54

12-1 Notes on Using Data Memory ........................................................................................................ 54

12-2 Memory for Weighing Data............................................................................................................. 55

12-3 Memory for Calibration and Calibration Test Data.......................................................................... 58

12-4 Memory for Unit Mass in the Counting Mode ................................................................................. 59

13. UNDERHOOK.............................................................................................................................60

14. PROGRAMMABLE-UNIT ...........................................................................................................61

RS-232C Serial Interface

15. DENSITY MEASUREMENT........................................................................................................62

16. RS-232C SERIAL INTERFACE / EXTERNAL INPUT ................................................................65

17. CONNECTION TO PERIPHERAL EQUIPMENT ........................................................................67

17-1 Connection to the AD-8121B Printer .............................................................................................. 67

17-2 Connection to a Computer.............................................................................................................. 67

17-3 Using Windows Communication Tools (WinCT)............................................................................. 68

18. COMMANDS...............................................................................................................................70

18-1 Command List................................................................................................................................. 70

18-2 Acknowledge Code and Error Codes ............................................................................................. 71

18-3 Command Example ........................................................................................................................ 72

18-4 Control Using CTS and RTS .......................................................................................................... 76

18-5 Settings Related to RS-232C ......................................................................................................... 76

Maintenance

19. MAINTENANCE..........................................................................................................................77

20. TROUBLESHOOTING ................................................................................................................77

20-1 Checking the Balance Performance and Environment................................................................... 77

20-2 Error Codes .................................................................................................................................... 78

20-3 Asking For Repair ........................................................................................................................... 81

21. SPECIFICATIONS.......................................................................................................................82

22. OPTIONS ....................................................................................................................................84

23. EXTERNAL DIMENSIONS .........................................................................................................87

24. TERMS/INDEX............................................................................................................................88

1. INTRODUCTION

This manual describes how the GX series balance works and how to get the most out of it in terms of performance.

Read this manual thoroughly before using the balance and keep it at hand for future reference.

1-1 About This Manual

This manual consists of the following five parts:

Basic operation ............................... Describes precautions on handling the balance, balance

construction and basic balance operation.

Adapting to the environment........... Describes response adjustment, calibration and calibration

test.

Functions ........................................Describes various functions of the balance.

RS-232C serial interface................. Describes the interface which transmits data and controls the

balance.

Maintenance ................................... Describes maintenance, error codes, troubleshooting,

specifications and options.

1-2 Features

 Built-in Calibration Weight (hereinafter referred to as internal mass), allows easy calibration,

adjustment and maintenance of the balance.

 Automatic Self Calibration, using the internal mass, adapting to changes in temperature.

 Self Check Function, provided to self-check the balance using the internal mass.

 Automatic Response Adjustment, adapting to vibration and drafts in the environment.

 Stabilization time of one second. When FAST is selected for the response rate, a stabilization

time of one second, to read a displayed value after a sample is placed on the pan, has been achieved.

 Data Memory Function, storing weighing data, calibration data or unit mass in the counting

mode. (About weighing data, 200 sets of data can be stored.) Interval Memory Mode is provided to weigh a sample and store the weighing data periodically.

 Good Laboratory Practice (GLP) data output using the standard RS-232C serial interface.

 Windows Communication Tools (WinCT), allows easy communication with a Windows-based

personal computer. Windows is the registered trademark of the Microsoft Corporation.

 Clock and Calendar Function, adding the time and date to the output data.

 Comparator Indicators, displaying the comparison results.

 Capacity Indicator, displaying the weight value in percentage relative to the weighing capacity.

 Hold Function, provided for weighing a moving object such as an animal.

 Underhook, for measuring density and weighing magnetic materials.

 Density Mode, for calculating the density of a solid.

 Multiple Weighing Units, with most of the common units used around the world.

 Reference Card, provided for a quick reference to the balance operation.

 Breeze Break, provided for GX-200/300/400/600/800/1000, for more accurate weighing.

1-3 Compliance

Compliance with FCC Rules

Please note that this device generates, uses and can radiate radio frequency energy. This device has been tested and has been found to comply with the limits of a Class A computing device pursuant to Subpart J of Part 15 of FCC rules. These rules are designed to provide reasonable protection against interference when this device is operated in a commercial environment. If this unit is operated in a residential area, it may cause some interference and under these circumstances the user would be required to take, at his own expense, whatever measures are necessary to eliminate the interference.

(FCC = Federal Communications Commission in the U.S.A.)

Compliance with EMC Directives

This device features radio interference suppression in compliance with valid

EC Regulation 89/336/EEC.

2. UNPACKING THE BALANCE

2-1 Unpacking

 The balance is a precision instrument. Unpack the balance carefully. Keep the packing

material to be used for transporting the balance in the future.

 The packing contents depend on the balance model. See the illustrations to confirm that

everything is contained.

GX-200/300/400/600/800/1000

How to assemble the breeze break (Only for GX-200/300/400/600/800/1000)

Assemble the breeze break as shown below. Follow the numbered sequence.

Bubble spirit level

Display

Weighing pan

Main unit

Pan support receptor

Main unit rear side

Windows communication tools (WinCT)

Note

Please confirm that the AC adapter type is correct for your local voltage and receptacle type.

Reference card

AC adapter

Keys

Leveling foot

Grounding terminal

AC adapter jack

AC adapter ID label

AC adapter plug

RS-232C serial interface External input terminal

Main unit cover

GX-2000/3000/4000/6100/6000/8000

Breeze ring

Weighing pan

Bubble spirit level

Display

Reference card

Windows communication tools (WinCT)

Keys

Leveling foot

Grounding terminal

AC adapter jack

Main unit

Pan support receptor

Main unit rear side

RS-232C serial interface (External input terminal)

AC adapter plug

Note

Please confirm that the AC adapter type is correct for your local voltage and receptacle type.

AC adapter

AC adapter ID label

Main unit cover

2-2 Installing the Balance

Install the balance as follows:

1. Refer to “3. PRECAUTIONS” for installing the balance. Place the balance on a solid weighing table.

2. GX-200/300/400/600/800/1000

Assemble the breeze break on the balance as shown in the illustration above.

GX-2000/3000/4000/6100/6000/8000 Assemble the breeze ring and weighing pan on the balance as shown in the illustration above.

3. Adjust the leveling feet to level the balance. Confirm it using the bubble spirit level.

4. Confirm that the adapter type is correct for the local voltage and power receptacle type.

5. Connect the AC adapter to the balance. Warm up the balance for at least 30 minutes with nothing on the weighing pan.

3. PRECAUTIONS

To get the optimum performance from the balance and acquire accurate weighing data, note the

following:

3-1 Before Use

 Install the balance in an environment where the temperature and

humidity are not excessive. The best operating temperature is about 20°C / 68°F at about 50% relative humidity.

 Install the balance where it is not exposed to direct sunlight and

it is not affected by heaters or air conditioners.

 Install the balance where it is free of dust.

 Install the balance away from equipment which produces

magnetic fields.

 Install the balance in a stable place avoiding vibration and

shock. Corners of rooms on the first floor are best, as they are less prone to vibration.

 The weighing table should be solid and free from vibration,

drafts and as level as possible.

 Level the balance by adjusting the leveling feet and confirm it

using the bubble spirit level.

 Ensure a stable power source when using the AC adapter.

 Warm up the balance for at least 30 minutes. Plug in the AC

adapter as usual.

 Calibrate the balance before use or after having moved it to

another location.

Caution

Do not install the balance where flammable or corrosive gas is present.

3-2 During Use

 Discharge static electricity from the material to be

weighed (hereinafter referred to as sample). When a

sample could have a static charge, the weighing data is

influenced. Ground the balance and try the following:

Eliminate the static electricity by AD-1683 as an accessory. Or try to keep the ambient humidity above 45%RH. Or use a metal shield case. Or wipe a charged plastic sample with the wet cloth.

 This balance uses a strong magnet as part of the

balance assembly, so please use caution when weighing magnetic materials such as iron. If there is a problem, use the underhook on the bottom of the balance to suspend the material away from the influence of the magnet.

 Cancel the temperature difference between a sample and the environment. When a sample is

warmer (cooler) than the ambient temperature, the sample will be lighter (heavier) than the true weight. This error is due to a rising (falling) draft around the sample.

 Make each weighing gently and quickly to avoid errors due to changes in the environmental

conditions.

 Do not drop things upon the weighing pan, or place a sample on the pan that is beyond the

balance weighing capacity. Place a sample in the center of the weighing pan.

 Do not use a sharp instrument such as a pencil to press the keys. Use your finger only.

 Press the RE-ZERO key before each weighing to prevent possible errors.

 Calibrate the balance periodically so as to prevent possible errors.

 Take into consideration the affect of air buoyancy on a sample when more accuracy is

required.

 Keep the balance interior free of dust and foreign materials.

 The breeze break (GX-200/300/400/600/800/1000 only) and the clear main unit cover are

provided as accessories. The breeze break components may be charged with static electricity when they are unpacked or when the humidity is low. If the weighing value is unstable or the balance has a problem with repeatability, remove the breeze break. Or wipe the clear plates with a moistened cloth, use an accessory DC static eliminator, AD-1683, or apply an anti-static spray.

3-3 After Use

 Avoid mechanical shock to the balance.

 Do not disassemble the balance. Contact the local A&D dealer if the balance needs service or

repair.

 Do not use organic solvents to clean the balance. Clean the balance with a lint free cloth that

is moistened with warm water and a mild detergent.

 Avoid dust and water so that the balance weighs correctly. Protect the internal parts from liquid

spills and excessive dust.

3-4 Power Supply

 Do not remove the AC adapter while the internal mass is in motion, for example, right after the

AC adapter is connected, or during calibration using the internal mass. If the AC adapter is removed under the conditions described above, the internal mass will be left unsecured, that may cause mechanical damage when the balance is moved.

Before removing the AC adapter, press the ON:OFF key and confirm that zero is displayed.

 When the AC adapter is connected, the balance is in the standby mode if the standby indicator

is on (refer to “4. DISPLAY SYMBOLS AND KEY OPERATION”). This is a normal state and

does not harm the balance. For accurate weighing, warm up the balance for at least 30 minutes

before use.

4. DISPLAY SYMBOLS AND KEY OPERATION

Key operation

Key operation affects how the balance functions. The basic key operations are:

 “Press and release the key immediately” or “Press the key”

= normal key operation during measurement

 “Press and hold the key”

Display symbols

Response indicators

・

Displays data stored in memory

・

Displays the weighing data relative to the weighing capacity, in percentage, in the weighing mode

Processing indicator

Stabilization indicator

Standby indicator

Data number of the

(Capacity indicator)

Weighing data or stored data

(Displayed for about 30 seconds when weighing starts.)

Animal mode indicator

Comparator indicators

Units

Interval memory standby indicator

data currently displayed

Processing indicator

Prior notice indicator of automatic self calibration

Each key, when pressed or when pressed and held, functions as follows:

Key When pressed When pressed and held

Turns the display on and off. The standby indicator is displayed when the display is

turned off. The weighing mode is enabled when the display is turned on. This key is available anytime. Pressing the key during operation will interrupt the

operation and turn the display off.

Blinking indicators

Interval memory active indicator

Performs calibration of the balance using

In the weighing mode, turns the minimum weighing value on and off.

In the counting or percent mode, enters the sample storing mode.

Switches the weighing units stored in the function table. Refer to “5. WEIGHING UNITS”.

the internal mass.

Stores the weighing data in memory or outputs to a printer or personal computer using the RS-232C interface (Factory setting), depending on the function table settings.

Sets the display to zero.

Enters the function table mode. Refer to “10. FUNCTION TABLE”.

Performs response adjustment and self check.

Displays other items of the calibration menu.

No function at the factory setting

By changing the function table: Outputs “Title block” and “End block” for GLP report. Displays the data memory menu.

5. WEIGHING UNITS

5-1 Units

With the GX series balance, the following weighing units and weighing modes are available :

Pct OZ

OZt

Counting mode

Percent mode

Density mode (To use this mode, it must be stored in the function table as described on

page 15. For details about this mode, refer to "15. DENSITY MEASUREMENT".

To select this mode, press the MODE key until the processing indictor

Programmable-unit (No unit displayed. For details, refer to "14. PROGRAMMABLE-UNIT".)

blinks with the unit "g" displayed. "DS" appears only when the density value is displayed.)

A unit or mode can be selected and stored in the function table as described on page 15. If a weighing mode (or unit of weight) has been turned off, that mode or unit will be missing in the sequence. Tael has four varieties, one of which can be selected and installed at the factory.

To select a unit or mode for weighing, press the MODE key.

dwt

For details about the units and modes, see the table below:

Name (unit, mode) Abbrev. Display

Function table (Storing mode)

Conversion factor

1 g = Gram g 1 g

Counting mode PC

Percent mode Pct

Ounce (Avoir) OZ 28.349523125 g

Pound Lb 453.59237 g Pound/Ounce L OZ l0 1Lb=16 oz,

1 oz=28.349523125 g

Troy Ounce OZt 31.1034768 g

Metric Carat ct 0.2 g

Momme mm 3.75 g

Pennyweight dwt 1.55517384 g

Grain (UK) GN 0.06479891 g

Tael (HK general, Singapore) 37.7994 g

Tael (HK jewelry) 37.429 g

Tael (Taiwan) 37.5 g

Tael (China)

31.25 g

Tola (India) t 11.6638038 g

Messghal MS 4.6875 g

Density mode (See note below)

is used to

show the density.

Programmable-unit (Multi-unit) Mlt

Note: The blinking processing indicator with “g” indicates that the density mode is selected.

The tables below indicate the weighing capacity and the minimum display for each unit, depending

on the balance model.

Unit

Gram

Ounce (Avoir)

Pound

Pound/Ounce 0Lb 7.41oz

Troy Ounce

Metric Carat

Momme

Pennyweight

Grain (UK)

Tael (HK general,

Singapore)

Tael (HK jewelry)

Tael (Taiwan)

Tael (China)

Tola (India)

Messghal

GX-200 GX-300 GX-400 GX-600 GX-800 GX-1000

210 310 410 610 810 1100

7.40 10.93 14.46 21.51 28.57 38.80

0.462 0.683 0.903 1.344 1.785 2.425

0Lb 10.93oz 0Lb 14.46oz 1Lb 5.52oz 1Lb 12.57oz 2Lb 6.80oz

6.75 9.96 13.18 19.61 26.04 35.36

1050 1550 2050 3050 4050 5500

56.0 82.6 109.3 162.6 216.0 293.3

135 199 263 392 520 707

3240 4784 6327 9413 12500 16975

5.55 8.20 10.84 16.13 21.42 29.10

5.61 8.28 10.95 16.29 21.64 29.38

5.60 8.26 10.93 16.26 21.60 29.33

6.72 9.92 13.12 19.52 25.92 35.20

18.0 26.5 35.1 52.2 69.4 94.3

44.8 66.1 87.4 130.1 172.8 234.6

Capacity

Minimum

0.000005

display

0.001

0.00005

0.01oz

0.00005

0.005

0.0005

0.001

0.02

0.00005

0.0001

0.0005

Unit

Gram 2100 3100 4100 6100 0.01

Ounce (Avoir) 74.0 109.3 144.6 215.1 0.0005

Pound 4.62 6.83 9.03 13.44 0.00005

Pound/Ounce 4Lb 10.08oz 6Lb 13.35oz 9Lb 0.62oz 13Lb 7.17oz 0.01oz

Troy Ounce 67.5 99.6 131.8 196.1 0.0005

Metric Carat 10500 15500 20500 30500 0.05

Momme 560 826 1093 1626 0.005

Pennyweight 1350 1993 2636 3922 0.01

Grain (UK) 32408 47840 63272 94137 0.2

Tael (HK general,

Singapore)

Tael (HK jewelry) 56.1 82.8 109.5 162.9 0.0005

Tael (Taiwan) 56.0 82.6 109.3 162.6 0.0005

Tael (China) 67.2 99.2 131.2 195.2 0.0005

Tola (India) 180 265 351 522 0.001

Messghal 448 661 874 1301 0.005

GX-2000 GX-3000 GX-4000 GX-6100

Capacity

55.5 82.0 108.4 161.3 0.0005

Minimum

display

Unit

Gram 6100 8100 0.1

Ounce (Avoir) 215 285 0.005

Pound 13.4 17.8 0.0005

Pound/Ounce 13Lb 7.17oz 17Lb 13.72oz 0.01oz

Troy Ounce 196 260 0.005

Metric Carat 30500 40500 0.5

Momme 1626 2160 0.05

Pennyweight 3922 5208 0.1

Grain (UK) 94136 125002 2

Tael (HK general,

Singapore)

Tael (HK jewelry) 162 216 0.005

Tael (Taiwan) 162 216 0.005

Tael (China) 195 259 0.005

Tola (India) 522 694 0.01

Messghal 1301 1728 0.05

GX-6000 GX-8000

Capacity

161 214 0.005

Minimum

display

5-2 Storing Units

The units or modes can be selected and stored in the function table. The sequence of displaying the units or modes can be arranged to fit the frequency of use. The units stored are maintained in non-volatile memory, even if the AC adapter is removed.

Select a unit or mode and arrange the sequence of display as follow s:

1 Press and hold the SAMPLE key until ba5fnc of

the function table is displayed, then release the key.

2 Press the SAMPLE key several times to display

1Unit .

3 Press the PRINT key to enter the unit selection mode.

4 Specify a unit or mode in the order to be displayed

using the following keys.

SAMPLE key To sequentially display the units.

RE-ZERO key To specify a unit or mode. The

stabilization indicator appears when the displayed unit or mode is specified.

Press and hold

Press several times

Select

Displays the units sequentially.

Specify

5 Press the PRINT key to store the units or modes. The

balance displays end and then displays the next menu of the function table.

6 Press the CAL key to exit the function table. Then the

balance returns to the weighing mode with the selected unit.

7 To select other unit or mode for weighing, press the MODE key.

Store

Unit setting example

The example below sets the units in the order with g (gram) as the first unit followed by pc (counting mode).

1 Press and hold the SAMPLE key until ba5fnc of

the function table is displayed, then release the key.

2 Press the SAMPLE key several times to display

1Unit .

3 Press the PRINT key to enter the unit selection mode.

4 Press the RE-ZERO key to specify the unit of g

The stabilization indicator appears when the unit is specified.

5 Press the SAMPLE key to display 1Unit pC .

6 Press the RE-ZERO key to specify the unit of pc

The stabilization indicator appears when the unit is specified.

7 Press the PRINT key to store the units.

The balance displays end and then displays the next menu item of the function table.

8 Press the CAL key to exit the function table. Then the

balance returns to the weighing mode with g, the unit selected first.

9 Press the MODE key to switch between g and pc

(g→pc).

Press and hold

Press several times

Specify

Select

Specify

Store

6. WEIGHING

6-1 Basic Operation (Gram Mode)

1 Place a container on the weighing pan, if necessary. Press the RE-ZERO key to cancel the weight (tare). The

balance displays 0.00 g. (The decimal point position depends on the balance model.)

2 Place a sample on the pan or in the container.

3 Wait for the stabilization indicator

Read the value.

4 Remove the sample and container from the pan.

Notes

To use other units, press the MODE key and select an

appropriate unit.

Press the SAMPLE key to turn on or off the minimum

weighing value.

The weighing data can be stored in memory. For details,

refer to “12. DATA MEMORY”.

When the ON:OFF key is pressed with a container placed on the weighing pan and weighing is started, the balance automatically cancels the weight (tare) and displays 0.00 g.

to be displayed.

Weighing pan

Container

Sample

Remove the sample

(Display off)

Weighing pan

Container

6-2 Counting Mode (PC)

This is the mode to determine the number of objects in a sample based on the standard sample unit mass. Unit mass means the mass of one sample. The smaller the variables in each sample unit mass is, the more accurate the counting will be. The GX series balance is equipped with the Automatic Counting Accuracy Improvement (ACAI) function to improve the counting accuracy.

Notes

For counting, use samples that have a unit mass at least ten times greater than that of the

minimum display in grams. If the sample unit mass variable is too large, it may cause a counting error. To improve the counting performance, use the ACAI function frequently or divide the samples

into several groups and count each group.

Selecting the counting mode

1 Press the MODE key to select pC (counting mode).

Storing a sample unit mass

2 Press the SAMPLE key to enter the sample unit mass

storing mode.

Even in the storing mode, pressing the MODE key will

switch to the next mode.

3 To select the number of samples, press the SAMPLE key

several times. It may be set to 10, 25, 50 or 100.

Note

A greater number of samples will yield more accurate counting result.

4 Place a container on the weighing pan, if necessary.

Press the RE-ZERO key to cancel the weight (tare). The number specified in step 3 appears.

e.g.: 25 0 pC is displayed if 25 is selected in step 3.

5 Place the number of samples specified on the pan. In this

example, 25 pieces.

6 Wait for the stabilization indicator

Press the PRINT key to calculate and store the unit mass. The balance displays 25 pC (counting mode) and is set to count samples with this unit mass. (The sample unit mass is stored in non-volatile memory, and is maintained even if the AC adapter is removed.)

to be displayed.

Weighing pan

Container

Sample (25 pieces)

To improve the accuracy of the unit mass, proceed to

step 8.

Notes

If the balance judges that the mass of the samples is too

light and is not adequate to be used as the unit mass, it displays lo . Do not use the samples.

If the balance judges that the mass of the samples is too

light to aquire accurate weighing, it displays an error requiring the addition of more samples to the specified number. In the example above, 150- pC appears, requiring 25 more samples. Add 25 samples and press the PRINT key. When the unit mass is stored correctly, the balance proceeds to the counting mode.

Counting operation

7 Place the samples to be counted on the pan.

Place sample to be counted

Note

Up to 20 unit masses can be stored in memory for the multiple sample. For details, refer to “12. DATA MEMORY”.

The counting result

Counting mode using the ACAI function

The ACAI is a function that improves the accuracy of the unit mass automatically by increasing the number of samples as the counting process proceeds.

8 If a few more samples are added, the processing indicator turns on. To prevent an error, add

three or more. The processing indicator does not turn on if overloaded. Try to add the same number of samples as displayed.

9 The balance re-calculates the unit mass while the processing indicator is blinking. Do not

touch the balance or samples on the pan until the processing indicator turns off.

10 Counting accuracy is improved when the processing indicator turns off.

Each time the above operation is performed, a more accurate unit mass will be obtained.

There is no definite upper limit of ACAI range for the number of samples exceeding 100. Try to add the same number of samples as displayed.

11 Remove all the samples used in ACAI and proceed with the counting operation using the

improved unit mass.

6-3 Percent Mode (Pct)

This is the mode to display the weight value in percentage compared to a 100% reference mass and

is used for target weighing or checking the sample variable.

Selecting the percent mode

1 Press the MODE key to select pct (percent mode). If the

percent mode can not be selected, refer to “5. WEIGHING UNITS”.

Storing the 100% reference mass

2 Press the SAMPLE key to enter the 100% reference

mass storing mode.

Even in the storing mode, pressing the MODE key will

switch to the next mode.

3 Place a container on the weighing pan, if necessary.

Press the RE-ZERO key to cancel the weight (tare). The balance displays 100 0 pct .

Weighing pan

Container

4 Place the sample to be set as the 100% reference mass

on the pan or in the container.

5 Press the PRINT key to store the reference mass. The

balance displays 100.00 pct . (The decimal point position depends on the reference value. The reference mass stored is stored in non-volatile memory, and is maintained even if the AC adapter is removed.)

Note

If the balance judges that the mass of the sample is too light to be used as a reference, it displays lo . Do not use the sample.

6 Remove the sample.

Reading the percentage

7 Place a sample to be compared to the reference mass on

the pan. The displayed percentage is based on the 100% reference mass.

Sample (100%)

Place sample to be weighed

Weighing result compared to 100% reference mass

6-4 Animal Weighing Mode (Hold Function)

This is the mode to weigh a moving object such as an animal, even when the display of the weighing data fluctuates. The hold function allows the average weight of the animal to be displayed. To use the hold function, set the function in the function table. For details, refer to “10. FUNCTION TABLE” and “10-4 Description of the Class “Environment, Display””.

7. RESPONSE ADJUSTMENT / SELF CHECK FUNCTION

This function detects the influence on weighing that is caused by drafts and/or vibration at the place where the balance is installed and sets the response characteristic automatically. When this function is selected, the balance self-checks the performance at the same time.

Two modes of response adjustment are available: automatic and manual.

The function has three rates as follows:

Changing the response rate changes the display refresh rate.

Indicator Parameter Response characteristic Display refresh rate

FAST Cond 0 MID. Cond 1 SLOW Cond 2

Note

To set the refresh rate of 5 times/second when the response rate is FAST or 10 times/second when the response rate is MID. or SLOW, change the “Display refresh rate (5pd)” parameter of “Environment, Display (ba5fnc)” in the function table. For details, refer to “10. FUNCTION TABLE”.

Fast response, Sensitive value

Slow response, Stable value

If the response rate is changed as follows: MID. or SLOW FAST =10 times/second FAST MID. or SLOW = 5 times/second

Response indicators

7-1 Automatic Response Adjustment / Self Check Function

This function automatically updates the response adjustment by analyzing the influence of the environment on the weighing data and also self-checks the balance performance using the internal mass.

Operation

1 Press and hold the MODE key until RESPONSE is

displayed, then release the key.

2 The balance automatically starts to check the balance

performance and sets the response characteristic.

Press and hold the key

Release the key

Caution

Do not allow vibration or drafts to affect the balance during adjustment.

3 After automatic adjustment, the balance displays the

updated response indicator and returns to the weighing mode. The response indicator remains displayed for about 30 seconds.

e.g. “ MID. OK ”

The example above indicates that the result of the self check is good and MID. is selected as

the response rate.

Displays the results.

Notes

If improper performance is found in the self check, the

balance displays CH no . Contact the local A&D dealer for repair.

If the automatic response adjustment fails, the

balance displays CH ng . Check the ambient conditions such as breeze and vibration, also check the weigning pan. Then, perform the adjustment again. To return to the weighing mode, press the CAL key.

If the automatic response adjustment is awkward, try

to refine it using the manual response adjustment.

7-2 Manual Response Adjustment

This function manually updates the response adjustment.

Operation

1 Press and hold the MODE key until RESPONSE is

displayed, then release the key.

Press and hold the key

Press the MODE key again quickly.

2 Press the MODE key to select a rate of the response

adjustment. Either FAST, MID. or SLOW can be selected.

3 After a few seconds of inactivity the balance displays

eend . Then, it returns to the weighing mode and

displays the updated response indicator. The response indicator remains displayed for about 30 seconds.

Note

The response adjustment can be changed at “Condition (Cond)” of “Environment, Display (ba5fnc)” in the function table. For details, refer to “10. FUNCTION TABLE”.

Release the key and press again

Each pressing switches the indicators

After a while

8. CALIBRATION

8-1 Calibration Group

The GX series balance has the following modes as a calibration group.

Calibration  Automatic self calibration (calibration due to changes in temperature  Calibration using the internal mass (one-touch calibration)  Calibration using an external weight Calibration test  Calibration test using an external weight (Calibration test does not perform calibration.) Correction of the internal mass value

Terms

The following terms are defined as follows: Internal mass = Built-in calibration weight External weight = A weight that you have. Referred to as a calibration weight when used for calibration. Calibration weight = A weight used for calibration Target weight = An external weight used for calibration test

Caution

 Calibration adjusts the balance for accurate weighing. Besides periodic calibration and before each use, perform calibration when:

• the balance is installed for the first time.

• the balance has been moved.

• the ambient environment has changed.

 Do not allow vibration or drafts to affect the balance during calibration.  To output the data for GLP using the RS-232C interface, set “GLP output ( info )” of “Data output

( dout )”. For details, refer to “10. FUNCTION TABLE”. Time and date are added to GLP report. If the time or date is not correct, adjust them. For details, refer to “10-9 Clock and Calendar Function”.

 Calibration test is available only when “GLP output ( info )” of “Data output ( dout )” is set to “1” or “2”,  The calibration and calibration test data can be stored in memory. To store them, set “Data

memory ( data )” to “3”. For details, refer to “12. DATA MEMORY”.

Caution on using an external weight

 The accuracy of an external weight can influence the accuracy of weighing. Select an

appropriate weight as listed below:

Model Usable calibration weight Adjustable range

GX-200 200 g, 100 g GX-300 300 g, 200 g, 100 g GX-400 400 g, 300 g, 200 g GX-600 600 g, 500 g, 400 g, 300 g, 200g GX-800 800 g, 700 g, 600 g, 500 g, 400 g, 300 g, 200g GX-1000 1000g, 900g, 800 g, 700 g, 600 g, 500 g, 400 g, 300 g, 200g GX-2000 2000 g, 1000 g GX-3000 3000 g, 2000 g, 1000 g GX-4000 4000 g, 3000 g, 2000 g GX-6100 6000 g, 5000 g, 4000 g, 3000 g, 2000g GX-6000 6000 g, 5000 g, 4000 g, 3000 g, 2000g GX-8000 8000 g, 7000 g, 6000 g, 5000 g, 4000 g, 3000g, 2000g

The calibration weight in bold type: factory setting The calibration weight value can be adjusted within the range above.

-0.015 g to +0.015 g

-0.15 g to +0.15 g

-1.5 g to +1.5 g

Display



This indicator means “the balance is measuring calibration data”. Do not allow vibration or drafts to affect the balance while this indicator is displayed.

8-2 Automatic Self Calibration (Calibration due to changes in temperature)

This function automatically calibrates the balance when the balance detects an ambient temperature change. If GLP output is selected in the function table, the balance outputs the calibration report or stores the data in memory. Automatic self calibration functions even if the display is turned off (standby state). ,

Caution

If something is on the weighing pan, the balance judges that it is in use and does not perform automatic self calibration. To maintain the calibrated state, keep the weighing pan clear while not in use.

The displays shown below are related to the automatic self calibration.

Indicates that the balance detects a change in ambient temperature and automatic self calibration will start. If the balance is not used for a few minutes with this indicator blinking, the balance performs automatic self calibration. The blinking duration depends on the environment.

Indicates that the balance is measuring calibration data. Do not allow vibration or drafts to affect the balance while this indicator is displayed. After calibration, the balance returns to indicate the previous display.

Note

The balance can be used while the indicator blinks. But, it is recommended that to maintain the accuracy, stop using the balance and confirm that there is nothing on the pan and allow the balance to perform self calibration.

8-3 Calibration Using the Internal mass (One-Touch Calibration)

This function calibrates the balance using the internal mass. The only operation required is to press

the CAL key

Operation

1 Connect the AC adapter and warm up the balance for at least 30 minutes with nothing on the

weighing pan.

2 Press the CAL key.

3 The balance displays Calin and performs calibration using the internal mass. Do not allow

vibration or drafts to affect the balance.

4 The balance displays end after calibration. If the “GLP output (info)” parameter of the

function table is set to “1” or “2”, the balance displays glp and outputs “Calibration Report” using the RS-232C interface or stores the data in memory. For details on the calibration report format, refer to “11-2 GLP Report”.

5 The balance will automatically return to the weighing mode after calibration.

About the internal mass

The mass of the internal mass (approximately 500 g) may change due to corrosion or other damage caused by the operating environment, or due to aging. Check the internal mass periodically. Correct the internal mass value as necessary. For details, refer to “8-6 Correcting the internal mass value”.

To maintain the weighing accuracy, perform the calibration using an external weight periodically, as described below.

8-4 Calibration Using an External Weight

This function calibrates the balance using an external weight.

Operation

1 Connect the AC adapter and warm up the balance

for at least 30 minutes with nothing on the pan.

2 Press and hold the CAL key until Calout is

displayed, then release the key.

Press and hold the key

3 The balance displays Cal 0 .

 If you want to change the calibration weight (a

list of usable weights is shown on page 24), press the SAMPLE key and proceed to step 4.

 If you use the calibration weight value stored in

the balance, proceed to step 5.

4 Specify the calibration weight value as follows:

SAMPLE key To switch the display

condition to: “All of the segments blinking” (calibration weight selection mode) or “The last two digits blinking” (value adjustment mode).

RE-ZERO key To select the calibration

weight or adjust the value. In the value adjustment mode,

-15 digits appear after +15 digits.

Release the key

Select a weight

To n e xt p ag e

e.g. Calibration weight value

1000.12 g

PRINT key To store the new weight

value. Even if the AC adapter is removed, the data is maintained in non-volatile memory.

CAL key To cancel the operation and

return to 1Cal 0 .

Note

Digit, when used for the GX series balance, indicates a unit of minimum weighing value.

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