Rice Lake GF Series User Manual

GF SERIES

GF-200/GF-300/GF-400/GF-600/GF-800/GF-1000 GF-1200/GF-2000/GF-3000/GF-4000/GF-6100 GF-6000/GF-8000

Precision Balance

INSTRUCTION MANUAL

1WMPD4000209C

© 2008 A&D Company Ltd. All rights reserved. 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

7. RESPONSE ADJUSTMENT / SELF CHECK FUNCTION............................................................21

7-1 Manual Response Adjustment.......................................................................................................... 21

7-2 Self Check Function ......................................................................................................................... 22

8. CALIBRATION ..............................................................................................................................23

8-1 Calibration Modes............................................................................................................................. 23

8-2 Calibration Using an External Weight............................................................................................... 24

8-3 Calibration Test Using an External Weight ....................................................................................... 26

Functions

9. FUNCTION SWITCH AND INITIALIZATION.................................................................................28

9-1 Permit or Inhibit ................................................................................................................................ 28

9-2 Initializing the Balance...................................................................................................................... 29

10. FUNCTION TABLE .....................................................................................................................30

10-1 Structure and Sequence of the Function Table .............................................................................. 30

10-2 Display and Keys............................................................................................................................ 30

10-3 Details of the Function Table .......................................................................................................... 31

10-4 Description of the Class “Environment, Display”............................................................................34

10-5 Description of the Item “Data output mode” ................................................................................... 36

10-6 Description of the Item “Data format” ............................................................................................. 37

10-7 Description of the Data Format Added to the Weighing Data ............................................................... 39

10-8 Data Format Examples................................................................................................................... 40

10-9 Comparator Function...................................................................................................................... 42

11. ID NUMBER AND GLP REPORT................................................................................................44

11-1 Setting the ID Number .................................................................................................................... 44

11-2 GLP Report ..................................................................................................................................... 44

12. DATA MEMORY..........................................................................................................................47

12-1 Notes on Using Data Memory ........................................................................................................ 47

12-2 Memory for Weighing Data............................................................................................................. 48

12-3 Memory for Unit Mass in the Counting Mode ................................................................................. 51

13. UNDERHOOK.............................................................................................................................52

14. PROGRAMMABLE-UNIT ...........................................................................................................53

15. DENSITY MEASUREMENT........................................................................................................54

RS-232C Serial Interface

16. RS-232C SERIAL INTERFACE / EXTERNAL INPUT ................................................................57

17. CONNECTION TO PERIPHERAL EQUIPMENT ........................................................................59

17-1 Connection to the AD-8121B Printer .............................................................................................. 59

17-2 Connection to a Computer.............................................................................................................. 59

17-3 Using Windows Communication Tools (WinCT) ............................................................................. 60

18. COMMANDS...............................................................................................................................62

18-1 Command List................................................................................................................................. 62

18-2 Acknowledge Code and Error Codes ............................................................................................. 63

18-3 Command Examples ...................................................................................................................... 64

18-4 Control Using CTS and RTS .......................................................................................................... 67

18-5 Settings Related to RS-232C ......................................................................................................... 67

Maintenance

19. MAINTENANCE..........................................................................................................................68

20. TROUBLESHOOTING ................................................................................................................68

20-1 Checking the Balance Performance and Environment................................................................... 68

20-2 Error Codes .................................................................................................................................... 69

20-3 Asking For Repair ........................................................................................................................... 71

21. SPECIFICATIONS.......................................................................................................................72

22. OPTIONS ....................................................................................................................................74

23. EXTERNAL DIMENSIONS .........................................................................................................77

24. TERMS/INDEX............................................................................................................................78

1. INTRODUCTION

This manual describes how the GF 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

 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.

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

 Data Memory Function, storing weighing data or unit mass in the counting mode. (About

weighing data, 40 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 Windows 95/98.

Windows is a registered trademark of the Microsoft Corporation.

 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 the GF-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 Council 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.

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

How to assemble the breeze break (Only for GF-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

RS-232C serial interface (External input terminal)

Main unit rear side

Reference card

Windows communication

Keys

Leveling foot

Pan support receptor

tools (WinCT)

AC adapter

Note

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

AC adapter

ID label

Grounding terminal

AC adapter plug

AC adapter jack

Main unit cover

GF-1200/2000/3000/4000/6100/6000/8000

Breeze ring

Display

Bubble spirit level

Reference card

Weighing pan

Keys

Leveling foot

Pan support receptor

AC adapter jack

AC adapter plug

Main unit

RS-232C serial interface (External input terminal)

Main unit rear side

Grounding terminal

Windows communication tools (WinCT)

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. GF-200/300/400/600/800/1000

Assemble the breeze break on the balance as shown in the illustration on page 6.

GF-1200/2000/3000/4000/6100/6000/8000 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.

 Eliminate 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 (GF-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

 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

・

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 data currently displayed

Processing indicator

(Capacity indicator)

Weighing data or stored data

Blinking indicators

Response indicators

(Displayed for about 30 seconds when weighing starts.)

Animal mode indicator

Comparator indicators

Units

Interval memory standby indicator

Interval memory

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

Key When pressed When pressed and held

Turns the display ON or 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.

active indicator

No function. Enters the calibration mode.

In the weighing mode, turns the minimum weighing value ON or 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”.

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”.

Enters the response adjustment/self check mode.

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

Counting mode

Percent mode

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

Pct OZ

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

OZt

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

GF-200 GF-300 GF-400 GF-600 GF-800 GF-1000

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

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

display

0.00005

0.000005

0.00005

0.001

0.01oz

0.005

0.0005

0.001

0.02

0.0001

0.0005

Capacity

Unit

GF-1200 GF-2000 GF-3000 GF-4000 GF-6100

Gram 1210 2100 3100 4100 6100 0.01

Ounce (Avoir) 42.6 74.0 109.3 144.6 215.1 0.0005

Pound 2.66 4.62 6.83 9.03 13.44 0.00005

Pound/Ounce

Troy Ounce 38.9 67.5 99.6 131.8 196.1 0.0005

Metric Carat 6050 10500 15500 20500 30500 0.05

Momme 322 560 826 1093 1626 0.005

Pennyweight 778 1350 1993 2636 3922 0.01

Grain (UK) 18673 32408 47840 63272 94137 0.2

Tael (HK

general,

Singapore)

Tael (HK

jewelry)

Tael (Taiwan) 32.2 56.0 82.6 109.3 162.6 0.0005

Tael (China) 38.7 67.2 99.2 131.2 195.2 0.0005

Tola (India) 103 180 265 351 522 0.001

Messghal 258 448 661 874 1301 0.005

2Lb 10.68oz 4Lb 10.08oz 6Lb 13.35oz 9Lb 0.62oz 13Lb 7.17oz

32.0 55.5 82.0 108.4 161.3 0.0005

32.3 56.1 82.8 109.5 162.9 0.0005

Minimum

display

0.01oz

Capacity

Unit

GF-6000 GF-8000

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)

Tael (Taiwan) 162 216 0.005

Tael (China) 195 259 0.005

Tola (India) 522 694 0.01

Messghal 1301 1728 0.05

161 214 0.005

162 216 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 follows:

1 Press and hold the SAMPLE key until ba5fnc of the

function table is displayed, then release the key.

Press and hold

2 Press the SAMPLE key several times to display

Unit .

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.

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.

Press several times

Select

Displays the units sequentially.

Specify

Store

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.

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 GF 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.

Weighing pan

Container

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 improve the accuracy of the unit mass, proceed to step 8.

to be displayed.

Sample (25 pieces)

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 .

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- 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.

pC appears,

Counting operation

7 Place the samples to be counted on the pan.

Note

Up to 20 unit masses can be stored in memory for the multiple sample. For details, refer to “12. DATA MEMORY”. The unit mass data in memory can be recalled or changed using commands from the computer.

The counting result

Place sample to be counted

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 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 .

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

7. RESPONSE ADJUSTMENT / SELF CHECK FUNCTION

7-1 Manual Response Adjustment

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

To increase the response rate, or to obtain a more stable display, perform the following:

Operation

1 Press and hold the MODE key until RESPONSE is

displayed, then release 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

Press and hold the key

Release the key and press again

Each pressing switches the indicators

After a while

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

7-2 Self Check Function

This function self-checks the internal performance of the balance.

Operation

1 Press and hold the MODE key until RESPONSE is

displayed, then release the key.

2 The balance automatically starts to check its internal

performance

3 After self-check, the balance displays the checking

result and returns to the weighing mode.

e.g. “ OK ”

The example above indicates that the result of the self

check is good.

Note

If improper performance is found in the self check, the balance displays CH no. Contact the local A&D dealer for repair.

Press and hold the key

Release the key

Displays the result.

8. CALIBRATION

8-1 Calibration Modes

The GF series balance has the following two modes.

 Calibration using an external weight  Calibration test using an external weight (Calibration test does not perform calibration.)

Terms

The following terms are defined as follows: 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”.

 Calibration test is available only when “GLP output ( info )” of “Data output ( dout )” is set to “1” or “2”,

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

GF-200 200 g, 100 g GF-300 300 g, 200 g, 100 g GF-400 400 g, 300 g, 200 g GF-600 600 g, 500 g, 400 g, 300 g, 200 g GF-800 800 g, 700 g, 600 g, 500 g, 400 g, 300 g, 200 g GF-1000 1000 g, 900 g, 800 g, 700 g, 600 g, 500 g, 400 g, 300 g, 200 g GF-1200 1000 g, 500 g GF-2000 2000 g, 1000 g GF-3000 3000 g, 2000 g, 1000 g GF-4000 4000 g, 3000 g, 2000 g GF-6100 6000 g, 5000 g, 4000 g, 3000 g, 2000 g GF-6000 6000 g, 5000 g, 4000 g, 3000 g, 2000 g GF-8000 8000 g, 7000 g, 6000 g, 5000 g, 4000 g, 3000 g, 2000 g

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.

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