Rice Lake Phoenix GH Series A&D Micro/Semi-Micro Balance, Phoenix GH Series, A&D Weighing Analytical Balance Manual

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1WMPD4000891C

Analytical Balance

GH-120
GH-200
GH-300
GH-202
GH-252

© 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..........................................................................................................................4

1.3. Compliance.....................................................................................................................4

2. Unpaking the Balance ....................................................................................................6

2.1. Installing the Balance .....................................................................................................7

3. Precautions.....................................................................................................................7

3.1. Before Use......................................................................................................................7

3.2. During Use......................................................................................................................8

3.3. After Use.........................................................................................................................9

3.4. Power Supply .................................................................................................................9

4. Display Symbols and Key Operation.......................................................................... 10

5. Weighing Units..............................................................................................................11

5.1. Units ..............................................................................................................................11

5.2. Changing the Units ...................................................................................................... 14

6. Weighing...................................................................................................................... 16

6.1. Basic Operation (Gram Mode).................................................................................... 16

6.2. Dual Range.................................................................................................................. 17

6.3. Counting Mode (PCS) ................................................................................................. 18

6.4. Percent Mode (%) ....................................................................................................... 20

Adapting To The Environment

7. Response Adjustment ................................................................................................. 21

7.1. Automatic Response Adjustment................................................................................ 21

7.2. Manual Response Adjustment.................................................................................... 22

8. Calibration.................................................................................................................... 23

8.1. Calibration Group ........................................................................................................ 23

8.2. Automatic Self Calibration ........................................................................................... 24

8.3. One-Touch Calibration ................................................................................................ 24

8.4. Calibration Test Using the Internal Mass .................................................................... 25

8.5. Calibration Using an External Weight ......................................................................... 26

8.6. Calibration Test Using an External Weight ................................................................. 27

8.7. Correcting the Internal Mass Value............................................................................. 28

9. Function Switch and Initialization................................................................................ 29

9.1. Permit or Inhibit............................................................................................................ 29

9.2. Initializing the Balance................................................................................................. 30

Selecting Functions

10. Function Table ............................................................................................................. 31

10.1. Setting the Function Table........................................................................................... 34

10.2. Details of the Function Table....................................................................................... 34

10.3. Description of the Class "Environment, Display"........................................................ 37

10.4. Description of the Item "Data Output Mode" .............................................................. 38

10.5. Description of the Item "Data Format" ........................................................................ 39

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10.6. Data Format Examples ............................................................................................... 42

10.7. Clock and Calendar Function...................................................................................... 44

11. ID Number and GLP Report ....................................................................................... 46

11.1. Setting the ID Number................................................................................................. 46

11.2. GLP Report.................................................................................................................. 47

12. Data Memory ............................................................................................................... 52

12.1. Notes on Using Data Memory..................................................................................... 52

12.2. Data Memory for Weighing Data ................................................................................ 53

12.3. Data Memory for Calibration and Calibration Test ..................................................... 56

13. Underhook ...................................................................................................................57

14. Density Measurement ................................................................................................. 58

Interface And Communication

15. Standard Input and Output Interface........................................................................... 61

15.1. RS-232C Interface....................................................................................................... 61

15.2. Connection to Peripheral Equipment.......................................................................... 62

15.3. Commands ..................................................................................................................64

Maintenance

16. Maintenance ................................................................................................................ 70

16.1. Treatment of The Balance........................................................................................... 70

16.2. Error Codes ................................................................................................................. 70

16.3. Other Display ............................................................................................................... 72

16.4. Checking the Balance Performance and Environment.............................................. 73

16.5. Asking for Repair .........................................................................................................73

17. Specifications............................................................................................................... 74

17.1. External Dimensions ................................................................................................... 75

17.2. Options and Peripheral Equipment............................................................................. 76

18. Terms/Index .................................................................................................................80

18.1. Terms ........................................................................................................................... 80

18.2. Index ............................................................................................................................ 81

2

1. Introduction

This manual describes how the balances of GH series work and how to get the most out of

them 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, the balance's construction and basic

operation.

Adapting to the environment .... Describes response (and stability) adjustment to adapt to the

environment where there is vibration or drafts, the way to
maintain weighing precision in a variation of ambient
temperature, calibration and calibration test.

Selecting functions.................... Describes functions of the balance.

Interface and communication ...Describes the serial interface used for communicating with a

computer that requests weighing data and controls the
balance, and for use with a printer

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

specifications and options.

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1.2. Features

Automatic self calibration, using the internal mass, adapting to changes in temperature.

Response adjustment adapting to drafts and/or vibration automatically.

Memory function to store weighing data and calibration data.

When weighing data is stored only, 200 data can be stored in maximum.
Interval memory mode to store the weighing data periodically.

Good laboratory practice (GLP) data can output using the RS-232C serial interface.

A built-in clock and calendar that can add the time and date to the output data.

Underhook, for measuring density and weighing magnetic materials.

Multiple weighing units with most of the common units used around the world.

Density mode for calculating the density of a solid.

Standard RS-232C serial interface to communicate with a computer.

Windows communication tools software (WinCT) to allow easy communication with a
computer using Windows.

When multiple balances have the GH-08 Ethernet interface installed and are connected to a

LAN, data can be acquired from them using the WinCT-Plus software.

1.3. Compliance

1.3.1. Compliance With FCC Rules

Please note that this equipment generates, uses and can radiate radio frequency

energy. This equipment 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
equipment 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.)

1.3.2. Compliance With EMC Directives

This device features radio interference suppression and safety regulation in

compliance with the following Council Directives
Council directive 89/336/EEC EN61326 EMC directive
Council directive 73/23/EEC EN60950 Safety of Information Technology Equipment

The CE mark is an official mandatory European marking.

Please note that any electronic product must comply with local laws and regulations when
sold or used anywhere outside Europe.

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2. Unpacking the Balance

Unpack the balance carefully. Keep the packing material to be used for transporting the

balance in the future. See the illustrations to confirm that everything is contained.

Fine range breeze break ring
This ring is an accessory for

the GH-252 and GH-202.
Before weighing with a
minimum display of 0.01 mg,

Weighing chamber

Weighing pan

Pan suppor

install this ring in place of the
"breeze break ring" to avoid
errors caused by drafts.

Fine range breeze break ring

Breeze break ring

Dust plate

Leveling foot

Bubble spirit level

Tweezers (AD-1689) for handling a
weight. Use it to avoid temperature
changes due to having your hand in
the weighing chamber, thus to
perform accurate calibration.

Windows communication

software (WinCT)

Position of placing
AC adapter labels

Floorplate

Dust plate

GH-252 and GH-202

C adapter jack

External Key Jac

Serial interface

Terminal cove

for

Keys

Displa

Display cove

(RS-232C,

D-sub 9 pins)

C adapter labels

C adapter

Note Please confirm that the AC adapter

type is correct for your local voltage
and receptacle type.

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Grounding

terminal

Leveling foo

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2.1. Installing the Balance

Install the balance as follows:

1 Consider the section "3. Precautions " for installing

your balance. Place the balance on a firm
weighing table.

2 Assemble the "Dust Plate", "Breeze Break Ring"

(or "Fine range breeze break ring") "Pan support",
and "Weighing Pan" on your balance. There is a
reference illustration on the previous page.

3 Adjust the level of the balance using the

leveling feet. Ground the balance chassis
for discharging static electricity if you have a
static problem.

4 Please confirm that the adapter type is correct for

your local voltage and power receptacle type.

5 Connect the AC adapter to the balance. Warm up

the balance for at least one hour with nothing on
the weighing pan.

Leveling fee

Bubble spirit level

6 Calibrate the balance before use. Refer to "8.

Calibration".

Connect the

AC adapter

3. Precautions

3.1. Before Use

To ensure that you get the most from your balance, please try to follow these conditions as

closely as possible.

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

Ensure a stable power source when using the AC adapter.

The best operating temperature is about 20°C / 68°F at about 50% Relative Humidity.

The weighing room should be free of dust.

The weighing table should be solid and free from vibration, drafts (such as frequently

opening doors or windows) and as level as possible.

Corners of rooms are best as they are less prone to vibration.

Do not install the balance near a heater or air conditioner.

Do not install the balance in direct sunlight.

Do not use the balance near other equipment which produces magnetic fields.

Adjust the level of the balance using the leveling feet.

Please warm-up the balance for at least one hour. Plug-in the AC adapter as usual.

Calibrate the balance before using and after moving it to another location.

Do not place or use the balance where there is flammable or corrosive gas present.

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3.2. During Use

Note the following items to get accurate weighing data.

Discharge static electricity from the weighing material.

When weighing sample (plastics, insulator, etc.) could

Charged material

have a static charge, the weight value is influenced.

Ground the balance, and
Eliminate the static electricity using the optional AD-1683.
Try to keep the ambient humidity above 45%RH at the room.
Use a metal shield case.
Wipe a charged material (plastic sample etc.) with a damp cloth.

This balance uses a strong magnet as part of the balance

assembly, so please use caution when weighing magnetic

materials. 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 temperature differences between the weighed sample

and the environment. When a sample is warmer (cooler) than the

ambient temperature, the sample will appear lighter (heavier) than

the true mass. This error is due to the rising (falling) draft next the

sample. If you touch the sample, the same type error will occur.

Do not touch the sample directly with your hand. Use tweezers or

other tools.

Metal case

Grounding

Magnet material

Draft

40°C20°C

Weighing pan

Make each weighing gently and quickly to avoid errors due to

changes in the environmental conditions.

Before weighing with a minimum display of 0.01 mg for the

GH-252 and GH-202, the "fine range breeze break ring" can be

installed in place of the "breeze break ring" to avoid errors

caused by drafts.

Do not drop things upon the weighing pan, or place a weight

beyond the range of the balance on the weighing pan.

Do not use a sharp instrument (such as a pencil or ball point pen)

to press the keys, use your finger only.

Fine range breeze

break ring

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Press the RE-ZERO key before each weighing to prevent

possible errors.

Calibrate the balance periodically so as to eliminate possible

errors.

Take into consideration the affect of air buoyancy on a sample

when more accuracy is required.

Avoid foreign matter (dust, liquid or metal fragments) that could

get inside the balance.

Operate your balance gently. Shorten the operation time as much

as possible ( Opening and closing door, putting and removing

sample). Use a pair of tweezers (pincette) to avoid temperature

changes due to heat from inserting your hand into the weighing

chamber.

3.3. After Use

Avoid mechanical shock to your balance.

Do not disassemble the balance. Contact your local A&D dealer if

your balance needs service or repair.

Do not use solvents to clean the balance. For best cleaning, wipe

with a dry lint free cloth or a lint free cloth that is moistened with

warm water and a mild detergent.

Avoid foreign matter (dust, liquid or metal fragments) that could

get inside the balance.

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 in weighing mode.

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

indicator is on. This is a normal state and does not harm the balance. For accurate

weighing, we recommend that you always plug in your balance so it can warm up.

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4. Display Symbols and Key Operation

Display

Processing indicator

Stabilization indicator

Standby indicato

of power supply

The current

data number

Prior notice indicator of
automatic self calibration

The amount of stored data
with memory data function

Response indicator
(Displayed for about 30 seconds
when weighing starts.)

Units

Interval memory function

Blinking indicators

Standby indicatorof

Weighing data or

stored data

Interval memory,

active indicator

Key operation

Press and release the key immediately" or "Click the key"

Press and hold the key

Key

The key to turn 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.

The key to switch the preset weighing units
stored in the function table. Refer to "5.
Weighing Units".
The key to perform calibration using the
internal mass.

The key to outputs the weighing data to a
printer or personal computer (or store it in
memory) depending on the function table
settings. (Factory setting = output)

When pressed and released When pressed and held

In the weighing mode, the key to turn the

minimum weighing value ON and OFF.

In the counting or percent mode, the key

to enter the sampling mode.

................................................................................................

........................................

The key to enter the function table
mode. Refer to "10. Function Table".

The key to perform automatic
response adjustment.

The key to display other items of the
calibration menu.
No function. (factory setting)
By changing the function table:

"Title block" and "End block" for

GLP report are output.

The data memory menu is

displayed.

The key to set the display to zero.

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5. Weighing Units

5.1. Units

All weighing units and weighing modes are as follows:

Counting mode

g mg pcs % oz ozt ct

d m t tl GN dwt mom

A unit or mode can be selected and stored in the function table as described in "5.2.

Changing the Units".

Density mode

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

14. For details about this mode, refer to "14. Density Measurement".

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

blinks with the unit "g" displayed.

Percent mode

If the law in your area permits, you may use all of the units. You can disable the units that

you don't regularly use. And you are able to turn them back on.

If a weighing mode (or unit of mass) 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.

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

Name (unit, mode) Abbreviation Display unit

Gram g 1 g
Milligram mg 0.001 g
Counting mode pcs
Percent mode %
Ounce (Avoir) oz
Troy Ounce ozt
Metric Carat ct
Momme mom 3.75 g
Pennyweight dwt
Grain (UK) GN
Tael (HK general, Singapore)
Tael (HK jewelry)
Tael (Taiwan)
Tael (China)
Tola (India) t
Messghal m 4.6875 g
Density mode d Refer to

tl

"14. Density Measurement"

Conversion
factor

-

-

28.349523125 g

31.1034768 g

0.2 g

1.55517384 g

0.06479891 g

37.7994 g

37.429 g

37.5 g

31.25 g

11.6638038 g

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

depending on the balance model.

GH-252

Standard range Precision range

Capacity

250 0.0001 101 0.00001

250000 0.1 101000 0.01

8.82 0.00001 3.56 0.000001

8.04 0.00001 3.25 0.000001

1250 0.001 505 0.0001

66.7 0.0001 26.9 0.00001

160.8 0.0001 64.9 0.00001
3858 0.002 1559 0.0002

6.61 0.00001 2.67 0.000001

6.68 0.00001 2.70 0.000001

6.67 0.00001 2.69 0.000001

8.00 0.00001 3.23 0.000001

21.43 0.00001 8.66 0.000001

53.3 0.0001 21.5 0.00001

Standard range Precision range

Capacity

220 0.0001 51 0.00001

220000 0.1 51000 0.01

7.76 0.00001 1.80 0.000001

7.07 0.00001 1.64 0.000001

1100 0.001 255 0.0001

58.7 0.0001 13.6 0.00001

141.5 0.0001 32.8 0.00001
3395 0.002 787 0.0002

5.82 0.00001 1.35 0.000001

5.88 0.00001 1.36 0.000001

5.87 0.00001 1.36 0.000001

7.04 0.00001 1.63 0.000001

18.86 0.00001 4.37 0.000001

46.9 0.0001 10.9 0.00001

Minimum

display

GH-202

Minimum

display

Capacity

Capacity

Minimum

display

Minimum

display

Gram
Milligram
Ounce (Avoir)
Troy Ounce
Metric Carat
Momme
Pennyweight
Grain (UK)
Tael (

HK general, Singapore
Tael (HK jewelry)
Tael (Taiwan)
Tael (China)
Tola (India)
Messghal

Gram
Milligram
Ounce (Avoir)
Troy Ounce
Metric Carat
Momme
Pennyweight
Grain (UK)
Tael (

HK general, Singapore
Tael (HK jewelry)
Tael (Taiwan)
Tael (China)
Tola (India)
Messghal

Unit

)

Unit

)

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Gram
Milligram
Ounce (Avoir)
Troy Ounce
Metric Carat
Momme
Pennyweight
Grain (UK)
Tael (

HK general, Singapore
Tael (HK jewelry)
Tael (Taiwan)
Tael (China)
Tola (India)
Messghal

Unit

GH-300 GH-200 GH-120

Capacity

320 220 120 0.0001

320000 220000 120000 0.1

11.29 7.76 4.23 0.00001

10.29 7.07 3.86 0.00001
1600 1100 600 0.001

85.3 58.7 32.0 0.0001

205.8 141.5 77.2 0.0001
4938 3395 1852 0.002

)

8.47 5.82 3.17 0.00001

8.55 5.88 3.21 0.00001

8.53 5.87 3.20 0.00001

10.24 7.04 3.84 0.00001

27.44 18.86 10.29 0.00001

68.3 46.9 25.6 0.0001

Minimum

display

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5.2. Changing the Units

The units or modes can be selected and stored in the function table. The sequence of

displaying these 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.

1 Press and hold the RANGE key until ba5fnc of the

function table is displayed in the weighing mode, then
release the key.

2 Press the RANGE 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.
RANGE key
RE-ZERO key

The stabilization indicator appears when the

Examples

.......

To display the units sequentially.

....

To specify a unit or mode.

displayed unit or mode is specified.

Unit Display

Press and hold

To uni

Examples

Gram g

Milligram mg

Counting mode pcs

Percent mode %

Densitymode d

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

balance displays end and then displays the next

menu item 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.

Displays the units

sequentially

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5.2.1. Unit setting example

The example below sets the units in the order with g (gram) as the first unit followed by pcs

(counting mode).

1 Press and hold the RANGE key until ba5fnc of the

function table is displayed in the weighing mode, then

release the key.

2 Press the RANGE key several times to display Unit .

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 RANGE key several times to display .

6 Press the RE-ZERO key to specify the unit of pcs.

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 pcs

(g→pcs).

Press and hold

Press

several times

Specif

Press

several times

Specif

Store

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6. Weighing

Precautions for the weighing operation

Press the RE-ZERO key each time, before placing a sample on the weighing pan, to

prevent possible errors.

Place a sample in the center of the weighing pan gently.

Temperature changes during measurement may cause weighing error.

Shorten the operation time as much as possible. ( Opening and closing door, putting and

removing sample)

Use a pair of tweezers to avoid a temperature change due to having your hand in the

weighing chamber.

Material with an electrostatic charge or that is magnetic may cause a weighing error.

Do not press keys with a sharp instrument (such as a pencil or ball point pen).

Do not drop things on the pan, or place a weight on the pan that is beyond the weighing

range of the balance.

Calibrate your balance periodically to maintain weighing accuracy. Refer to section "8.

Calibration".

Keep the area clean and dry.

Consider section "3. Precautions" for the weighing operation.

For precision weighing, keep the AC adapter connected to the balance.

6.1. Basic Operation (Gram Mode)

Read section "4. Display symbols and Key operation" before operation.

Note When turning on the balance with a container placed on the

pan, the tare function sets the display to zero automatically.

1 Turn on the balance using the

2 Select a preset unit (g or mg) using the MODE key.

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

Press the RE-ZERO key to cancel the weight (tare).

Then zero is displayed.

Container : A vessel placed on the pan, but not to be

included in the weighing data.

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

ON:OFF key.

Container

Weighing pan

Stabilization

indicator

Sample

5 Wait for the stabilization indicator to be displayed,

then read the value.

6 Remove the sample and container from the pan.

16

Remove them

6.2. Dual Range

Weighing range

Available minimum display

GH-252 GH-202
Precision range 0 g to 101 g 0 g to 51 g 0.01 mg 0.1 mg 1 mg
Standard range 101 g to 250 g 51 g to 220 g 0.1 mg 1 mg

The GH-252 and GH-202 are

equipped with two ranges "precision

Precision Range

Turn on the balance

Standard Range

Turn on the balance

range" and "standard range".

When weighing is started by

pressing the ON:OFF key, the

Minimum display

0.1mg

minimum display will be 0.1 mg.

Pressing the RANGE key will

Minimum display

0.01mg

switch these ranges alternately.

Minimum display

1mg

When a sample is weighed using the

precision range with a minimum display of

0.01 mg and the weight value exceeds the

Minimum display

0.01mg
precision range value, the minimum display
changes to 0.1 mg of the standard range.
When removing the sample, the minimum

Minimum display

0.1mg

display changes to 0.01 mg of the precision
range automatically.

Minimum display

0.01mg

When a tare weight (container mass value)

exceeds the precision range value, even if
the sample is within the precision range

Minimum display

0.01mg

value, 0.01 mg of the precision range can
not be selected for the minimum display. In
order to select 0.01 mg of the precision

Minimum display

0.1mg
range, remove the tare weight and press
the RE-ZERO key to cancel it.

Zero display after

placing a container

Minimum display

When a minimum display of 0.1 mg or 1 mg is

selected by the RANGE key, the minimum
display is maintained even if the range is
changed during weighing.

Zero display after

removing the container

Minimum display

Minimum display

0.1mg

Minimum display

1mg

0.1mg

0.01mg

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6.3. Counting Mode (PCS)

This is the mode to determine the number of objects in a sample based on the standard

sample unit mass. The unit mass means an average mass of the samples. The smaller the
variation in the samples, the more accurate the count will be. The balance is equipped with the
Automatic Counting Accuracy Improvement (ACAI) function to improve the counting accuracy.

Notes

Use samples with a unit mass of 1 mg or more for counting.
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 the unit pcs (counting mode).

Storing a sample unit mass (Weighing input mode)

2 Press the RANGE key to enter the sample unit mass storing mode.

3 To select the number of samples using the RANGE key.

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

Advise

A greater number of samples will yield more

accurate counting result.

4 Place a container on the weighing pan, if nec essary.

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

Example

5 Place the number of samples specified on the pan.

In this example, 25 pieces.

6 Wait for the stabilization indicator to be displayed.

Press the
mass. Then the balance displays 25 pcs 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.

Notes

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

light (
it displays lo .

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

to acquire accurate weighing, it displays an error requiring
the addition of more samples to the specified number.
Example:
25 samples and press the PRINT key. When the unit mass is
stored correctly, the balance proceedes to the counting mode.

: 25 0 pcs is displayed if 25 is selected in step 3.

PRINT key to calculate and store the unit

under 0.0001g

150 - pcs appears, requiring 25 more samples. Add

) and can not be stored as the unit mass,

Weighing pan

Container

25 Samples

Place samples

Counting operation

7 Place the samples to be counted on the pan.

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Counting result

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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.
ACAI: Automatic Counting Accuracy Improvement

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 to the 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.

Note ACAI will not function on the unit mass entered using the keys, or digital input

mode.

The mark turns on and

off during calculation.

The mark turns off after

the unit mass is improved.

Add a few

more samples.

The mark turns on

at proper range.

From step 7

Repea

19

6.4. Percent Mode (%)

The percent mode displays the weight value in percentage compared to a 100% reference

mass and is used for target weighing or checking the sample variance.

Selecting the percent mode

1 Press the MODE key to select the unit % (Percent mode).

If the percent mode can not be selected, refer to "5. Weighing
Units".

Storing the 100% reference mass

2 Press the RANGE 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 %.

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 %. (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

Position of decimal point can be changed by 100% mass.

100% mass Minimum display

0.0100g to 0.0999g 1%

0.1000g to 0.9999g 0.1%

1.0000g to weighing capacity 0.01%

If the balance judges that the mass of the sample is too light

(

under 0.01g

A 100% reference mass can be stored in the non-volatile

memory and is maintained even if the AC adapter is removed.

6 Remove the sample.

) to be used as a reference, it displays lo .

Place sample

Pan

Container

100% mass

Reading the percentage

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

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

Percentage

20

7. Response Adjustment

This function stabilizes the weight value, reducing the influence on weighing that is caused

by drafts and/or vibration at the place where the balance is installed. This function adjusts by
automatically analyzing the environment or by hand-operation. The function has three stages
as follows :

Indicator Parameter Response Stability

FAST Cond 0
MID. Cond 1
SLOW Cond 2

Fast response, Sensitive value

Slow response, Stable value

7.1. Automatic Response Adjustment

This function automatically updates the response adjustment by analyzing the influence of

the environment using the internal mass.

1 Press and hold the MODE key until RESPONSE is

displayed, then release the key.

2 The balance automatically sets the response characteristic.

Caution Do not allow vibration or drafts to affect the

balance during adjustment.

3 After automatic adjustment, the balance displays

returns to the weighing mode and displays the updated
response indicator for about thirty seconds.

Note

If the automatic response adjustment fails, the balance displays CH ng . Check the ambient

conditions such as breeze and vibration, also check the weighing pan. Then, perform the
adjustment again. To return to the weighing mode, press the

If there is matter on the weighing pan, the balance displays CH 0 . Remove them from the

pan. To return to the weighing mode, press the CAL key.

Advise

If the automatic response adjustment is not helpful, try "7.2. Manual Response Adjustment".

1end1,

Press and hold

Release

Result

CAL key.

Response
indicator

21

t

7.2. Manual Response Adjustment

1 Press and hold the MODE key until RESPONSE is

displayed, then release the key.
Press the MODE key again quickly.

2 Select a stage of the response adjustment using

the MODE key. Either FAST , MID. or SLOW
can be selected.

3 The balance displays 1end1, returns to the

weighing mode and displays the updated
response indicator for about thirty seconds.

Advise

If the automatic response adjustment is not helpful, specify a parameter for "Condition (Cond)

" of "Environment, Display (ba5fnc)" with key operation.

Select a parameter

Press and hold

Release
Press again
immediately

Release and wai

22

8. Calibration

8.1. 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 that you have

Calibration test

Calibration test using the internal mass
Calibration test using target mass that you have

Correction of the internal mass value

Correction of the internal mass value

Caution

Do not allow vibration or drafts to affect the balance during calibration.
Calibration test does not perform calibration.
To output the data for GLP using the RS-232C interface, set "GLP output (info)" of "Data

output (dout)". Refer to "10. Function Table". Time and date can be added to GLP report. If
the time or date is not correct, adjust them. Refer to "10.7 Clock and Calendar Function".

Calibration test is available only when "GLP output (info)" of "Data output (dout)" is set .
The calibration and calibration test data can be stored in memory. To store them, set "Data

memory (data)". Refer to "12. Data Memory" for details.

Caution on using an external weight

The accuracy of an external weight can influence the accuracy of weighing.
Select a mass for calibration and calibration test from the following table.

Model Usable calibration mass Adjustable range
GH-120 50g, 100g*
GH-200 100g, 200g*
GH-300 100g, 200g*, 300g
GH-202, GH-252 20g, 50g, 100g, 200g* -15.00 mg to +15.99 mg

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

Display

This indicator means "In process of measuring calibration data".

Do not allow vibration or drafts to affect the balance while the indicator is
displayed.

About the internal mass

The internal mass may change due to corrosion or other damage caused by the operating

environment, or due to aging. Check the internal mass periodically and correct the internal
mass value if necessary.

-15.0 mg to +15.9 mg

23

8.2. Automatic Self Calibration

Automatic self 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). Refer to "9-1. Permit Or Inhibit" for the operation.

Caution

When using automatic self calibration, do not place something on the weighing pan.
If something is on the weighing pan, the balance decides that it is in use and does

not perform automatic self calibration.

When weighing a light sample or installing the balance in a system, turn off

automatic self calibration.

Note When turning on the balance with nothing on the pan, if a sample heavier than 0.5

g is placed on the pan, the balance detects the state that a sample is placed on the

The mark is "

The balance is measuring calibration data. Do not allow vibration or drafts

Advise
The balance can be used while the indicator blinks. But, it is recommended that to

pan and does not perform the automatic self calibration.

prior notice indicator of
When the balance detects a change in ambient temperature, this
indicator blinks and automatic self calibration is required. If the
balance is not used for several minutes with this indicator blinking,
the balance performs automatic self calibration. The environment will
affect the time that the indicator blinks.

to affect the balance while this indicator is displayed. After calibration,
the balance returns to indicate the previous display.

maintain the accuracy, stop using the balance and confirm that there is nothing on the
pan and allow the balance to perform self calibration.

automatic self calibration".

8.3. One-Touch Calibration

This function calibrates the balance using the internal mass.

The only operation required is to press the CAL key.

1 Connect the AC adapter and warm up the balance for at least one

hour with nothing on the weighing pan.

2 Press the CAL key to display Cal in .
3 The balance performs calibration using the internal mass.

Do not allow vibration or drafts to affect the balance.

4 The balance displays

the balance displays glp and outputs the calibration report using
the RS-232C interface or stores the data in memory. Refer to "GLP
output (info)" and "Data memory (data)" of the function table.

5 The balance will automatically return to the weighing mode after

calibration.

6 Confirm weighing accuracy using calibration test (

24

end after calibration. If the GLP output is set,

GLP output

CC in).

t

8.4. Calibration Test Using the Internal Mass

This function tests the balance accuracy using the internal mass.

When the GLP output is set, the calibration test report is output or stored.

1 Connect the AC adapter and warm up the

balance at least one hour.

2 Press and hold the CAL key until is CC in

displayed, then release the key.

3 The balance measures the zero point.
Prevent vibration and drafts to affect the balance.

4 The measured zero point data is displayed.

5 The balance measures the full scale data.
Prevent vibration and drafts to affect the balance.

7 The full scale data is displayed. The tolerance

of the full scale data is ±0.2mg.

Model Full scale data
GH-120 100.000 g
GH-200, GH-300,
GH-202, GH-252

8 When the GLP output is set, the calibration

test report is output or stored.

Refer to "GLP output (info)" and "Data

memory (data)" of the function table.

The zero point data and full scale data is

displayed (or output) in unit of 0.0001g.

8 The balance automatically returns to the weighing mode.

200.000 g

GLP outpu

(Balance is not calibrated)

Press and hold

Release

25

t

y

8.5. Calibration Using an External Weight

This function calibrates the balance using an external weight.

1 Connect the AC adapter and warm up the balance for at

least one hour with nothing on the weighing pan.

2 Press and hold the CAL key until Calout is

displayed, then release the key.

3 The balance displays Cal 0 .
If you want to change the calibration mass, press

the RANGE key and proceed to step 4.

If you use the calibration mass value stored in the

balance, proceed to step 5.

4 Specify the calibration mass value as follows:

RANGE key
RE-ZERO (+)key

MODE (-)ke

PRINT key

CAL key

5 Confirm that there is nothing on the pan and press the

PRINT key. The balance measures the zero point.

Do not allow vibration or drafts to affect the balance.

The balance displays the calibration mass value.

6 Place the displayed calibration weight on the pan and press

the PRINT key. The balance measures the calibration
mass. Do not allow vibration or drafts to affect the balance.

7 The balance displays end . Remove the weight from the pan.

8 If the "GLP output (info)" the function table is set, the

balance displays glp and outputs or stores "Calibration
Report". Refer to "11.2. GLP Report" for details.

9 The balance will automatically return to the weighing mode.

10 Place the calibration weight on the pan and confirm that the

value displayed is correct. If it is not within the range, check
the ambient conditions such as breeze and vibration also
check the weighing pan. Then, repeat steps 1 to 10.

........

...

..........

.............

The key to switch blinking figures.
The keys to select the calibration mass or
adjust the mass value. Refer to page 23.
The key to store the new mass value. Even
if the AC adapter is removed, the data is
maintained in non-volatile memory.
The key to cancel the operation and return
to Cal 0 .

Press
and
hold

Release

Selec

Specify

Example:

New weight

100.0012 g

Place weight

Remove

GLP output

26

y

8.6. Calibration Test Using an External Weight

This function tests the weighing accuracy using an external weight.
Calibration test report can be output or stored with "GLP output

(info)" (Calibration test does not perform calibration).

1 Connect the AC adapter and warm up the balance for

at least one hour with nothing on the weighing pan.

2 Press and hold the CAL key until CC out is displayed,

then release the key.

3 The balance displays CC 0 .
If the target mass is changed, press the RANGE key and

proceed to step 4. A list of usable weights is on page 23.

If current target mass value is used, proceed to step 5.

4 Specify the target mass value as follows:

RANGE key
RE-ZERO (+)key

MODE (-)ke

PRINT key

CAL key

5 Confirm that there is nothing on the pan and press the PRINT1

key. The balance measures the zero point and displays the
measured value. Do not allow vibration or drafts to affect the
balance. The balance displays the target mass value.

6 Place the displayed target mass on the pan and press the

1PRINT

displays the measured value. Do not allow vibration or drafts
to affect the balance.

7 The balance displays end .

Remove the weight from the pan.

8 The balance displays

test report. Refer to "11.2. GLP Report" of the function table
for details.

9 The balance will automatically return to the weighing mode.

............

..............

The key to switch blinking figures.

.......

The keys to select the target mass or
adjust the mass value. Refer to page 23.
The key to store the new mass value.
Even if the AC adapter is removed, the
data is maintained in non-volatile memory.

.................

The key to cancel the operation and
return to CC 0 .

key. The balance measures the target mass and

glp and outputs or stores "calibration

GLP output

Press
and
hold

Release

Select

Specify

Example:

New weight

100.0012 g

Place weight

Remove

27

200.0000

200.0006

s

8.7. Correcting the Internal Mass Value

The balance can correct the internal mass value within the range shown below. This function

corrects the internal mass value to conform to an external weight. The corrected mass value
is maintained in non-volatile memory even if the AC adapter is removed. The internal mass
value is corrected as follows:

Model Target Range

200g

GH-120 100.000 g
GH-200

GH-300
GH-202

200.000 g

±1.5 mg

g

GH-252

1 Calibrate the balance using the internal mass. (one-touch calibration)
Example: 200.0000 g is corrected to +0.6 mg (200.0006 g). When correcting a 100 g

external weight by +0.6 mg, the weight changed into 200 g, the correction value is +1.2 mg.

2 Press the ON:OFF key to turn off the display.

3 While pressing and holding the PRINT key and the RANGE key,

press the ON:OFF key. The balance displays p5 .

4 Press the PRINT key. Then the balance displays the function

switches. Set the function table switch and internal mass correction
switch to "1" as shown above using the following keys.

RANGE key
RE-ZERO key
PRINT key
CAL key

........

.....

.........

.............

The key to select blinking figure.
The key to change the value of the blinking figure..
The key to store it and return to weighing mode.
The key to cancel current operation.

Function table switch

5 Press and hold the

Correction switch of internal mass

RANGE key to enter the function

table and release the key when ba5fnc is displayed.

6 Press the RANGE key several times until C5 in is displayed,

then release the key.

7 Press

PRINT key. Correct the internal mass value using the

following keys.

RE-ZERO (+)key
MODE (-)key
PRINT key

..

The key to select the value.

........

The key to select the value.

.........

The key to store the new value and display the
next menu item of the function table.

CAL key

.............

The key to cancel this correction and display
the next menu item of the function table.

8 Press the CAL key to return the weighing mode.

9 Press the CAL key to calibrate the balance using the internal mass.

10 Check the correction that has been performed properly with the

external weight. If the value is incorrect, repeat the correction.

The same mass

Correct the internal

mass by +0.6mg.
Calibrate with this

internal mass.

Corrected external weight

Press and hold Pres

Weighing mode

Press and hold

200g

g

28

9. Function Switch and Initialization

9.1. Permit or Inhibit

The balance stores parameters that must not be changed unintentionally (Example:

Calibration data for accurate weighing, Data for adapting to the operating environment,
Control data for the RS-232C interface). There are five switches for the purpose of protecting
parameters. Each switch can select either "permit" or "inhibit". "Inhibit" protects parameters
against unintentional operations.

1 Press the ON:OFF key to turn off the display.

2 While pressing and holding the PRINT key and the RANGE key,

press the ON:OFF key to display p5 .

3 Press the PRINT key. Then the balance displays the function switches.

4 Specify the switches using the following keys.

RANGE key
RE-ZERO key

0 To inhibit changes. (Can not be used.)
1 To permit changes. (Can be used.)

PRINT key
CAL key

...........

.........

.............

.................

Function table

0 To inhibit changes to the function table.
1 To permit changes to the function table.

Calibration using the internal mass (One-touch calibration)

0 To inhibit calibration using the internal mass.
1 To permit calibration using the internal mass.

Calibration using the external weight

0 To inhibit calibration using the external weight.
1 To permit calibration using the external weight.

Automatic self calibration (due to changes of ambient temperature)

0 To inhibit automatic self calibration.
1 To permit automatic self calibration.

Internal mass correction

0 To inhibit correction.
1 To permit correction.

The key to select blinking digit.
The key to change the parameter for the selected switch.

The key to store the new parameter and return to the weighing mode.
The key to cancel current operation and return to the weighing mode.

29

9.2. Initializing the Balance

This function returns the following parameters to factory settings.

Calibration data
Function table
The sample unit mass value (counting mode),

100% reference mass value (percent mode)
The data that is stored in the balance using the data memory function
External calibration weight and target mass value
Function switch settings ("9.1. Permit Or Inhibit")
Liquid density and temperature in the density mode

Note Be sure to calibrate the balance after initialization.

1 Press the ON:OFF key to turn off the display.

2 While pressing and holding the PRINT key and the

RANGE key, press the ON:OFF key to display p5 .

3 Press the RANGE key to display Clr .

4 Press the PRINT key.

To cancel this operation, press the CAL key.

5 Press the RE-ZERO key to display Clr go .

6 Press the PRINT key to initialize the balance.

The balance will automatically return to the weighing mode.

Press and hold Press

30

10. Function Table

The function table reads or rewrites the parameters that are stored in the balance. These

parameters are maintained in non-volatile memory, even if the AC adapter is removed.

The function table menu consists of two layers. The first layer is the "Class" and the second

layer is the "Item".

10.1. Setting the Function Table

Display symbol and keys

The symbol "〇" shows effective parameter.

When pressing and holding the key in the weighing mode, the mode enters the
function table mode.
The key to select the class or item in the function table mode.

The key to change the parameter.

When displaying a class, the key enters an item in the class.
When displaying an item, the key stores the new parameter and displays the
next class.

When displaying an item, the key cancels the new parameter and displays the
next class.
When displaying a class, the key exits the function table mode and returns to
the weighing mode.

31

Setting procedure

1 Press and hold the RANGE key until ba5fnc of the function table is displayed in the

weighing mode, then release the key

2 Press the RANGE key to select a class.

3 Press the PRINT key to enter the class

4 Press the RANGE key to select a item.

5 Press the RE-ZERO key to select a parameter for the selected item.

6 If storing parameters of the selected class, press the PRINT key.

Then the next class is displayed.
If canceling the current operation, press the CAL key. Then the next class is displayed.

7 When specifying parameters for another class, proceed to step 2.

When finishing the setting, press the

CAL key to return to weighing mode.

32

r

Setting example

This example sets "Stores weighing data" for "Data memory" and "1 minute" for "Interval time".

Class

Weighing mode

Start

Step 1

Press and

Press several

hold

Step 2

times

Step 3

Item

Step 4

Press several
times

Step 6

Step 4

Item
"Data memory"

Parameter
"Stores weighing data"

Step 5

Paramete
"1 minute"

Step 5

Step 8

Finish

Weighing mode

Item
"Interval time"

Step 7

33

10.2. Details of the Function Table

Class Item and Parameter Description

0

ba5fnc

Environment
Display

Cl adj

Clock

Cond

Condition

5t-b

Stability band width

trc

Zero tracking

5pd

Display refresh rate

pnt

Decimal point

p-on

Auto display-ON

Refer to "10.7. Clock and Calendar Function"

Fast response, sensitive value

1

2

Slow response, stable value

0

Stable range is ±1 digit

1

2

Stable range is ±3 digits

0

OFF

1

Normal

2

Strong

3

Very strong

0

5 times/second

1

10 times/second

0

Point (.)

1

Comma (,)

0

OFF

1

ON

0

Key mode

FAST

MID.

SLOW

#1

Can be changed by response
adjustment.

The stabilization indicator illuminates
when the display fluctuation is within
the range.

Keeps zero display by tracking zero
drift.

Period to refresh the display

Decimal point format

Turns on the weighing mode display
when the AC adapter is connected.

The time and date are added to the
output data.

Accepts the PRINT key only when
the display is stable.

Auto print mode A

1

prt

Data output mode

2

3

dout

Data output

ap-p

Auto print polarity

0
1
2

ap-b

Auto print difference

0

1
2

data

Data memory

0
1
2

:

(Reference = zero)
Auto print mode B
(Reference = last stable value)

Stream mode /
Interval memory mode

Plus only
Minus only
Both
10 digits
100 digits
1000 digits
Not used
Stores weighing data
Stores calibration data

Factory settings.

Outputs data when the display is
stable and conditions of
and the reference value are met.

With

data 0

continuously; with
interval memory.

Displayed value>Reference

Displayed value<Reference

Regardless of displayed value

Difference between reference value
and displayed value

#2

Related items:

prt, int, d-no, 5-td, info

, outputs data

data 2

#1 The unit of minimum display is digit.

Example: If 1 mg display is selected using the RANGE key for the GH-300, 1 mg is one
digit.

#2 Usable minimum display of the balance is one digit.

Example: In gram display, one digit is 0.01 mg for the GH-252 and 0.1 mg for the GH-300.

ap-p, ap-b

, uses

34

Class Item and Parameter Description

0

Every measurement

1

2 seconds

2

5 seconds

3

10 seconds

4

30 seconds

5

1 minute

6

2 minute

7

5 minute

8

10 minute

0

No output

1

Output
No output

0

Time only

1

Date only

2

Time and date

3

No output

0

Output

1

0

No pause

1

Pause (1.6 seconds)

0

Not used

1

Used

0

No output

1

AD-8121 format

2

General data format

0

Not used

1

Used

0

600 bps

1

1200 bps

2

2400 bps

3

4800 bps

4

9600 bps

5

19200 bps

0

7 bits, even

1

7 bits, odd

2

8 bits, none

0

CR LF

1

CR

0

A&D standard format

1

DP format

2

KF format

3

MT format

4

NU format

5

CSV format

Interval time in the interval memory
mode when using

Refer to "12. Data Memory"

Selects whether or not the time
or date is added to the weighting
data. Refer to "10.7. Clock and
Calendar Function" for details.

Selects whether or not the ID
number is output.

Selects the data output interval.

Selects whether or not automatic
feed is performed.

Selects GLP output method.
Refer to "11. ID Number And GLP
Report "

Adjusts zero automatically after data
is output

CR: ASCII code 0Dh
LF: ASCII code 0Ah

Refer to "10.5. Description of Item
"Data Format".

dout

Data output

5if

Serial
interface

int

Interval time

d-no

Data number output

5-td

Time/Date output

5-id

ID number output

pU5e

Data output pause

at-f

Auto feed

info

GLP output

ar-d

Zero after output

bp5

Baud rate

btpr

Data bit, parity bit

Crlf

Terminator

type

Data format

for details.

prt 3, data 1

:
Caution

The balance may not transmit the data completely at the specified refresh rate, depending
on the baud rate or data added to the weighing data such as time, date and ID number.

Factory settings.

35

0

No limit

1

1 second

0

No output

1

Output

0

Not used

1

Used

0

Water temperature

1

Liquid density

Refer to "5. Weighing Units".

Selects the wait time to receive a
command.

AK: ASCII code 06h

Controls CTS and RTS.

Available only when density mode is
selected

5if

Serial
interface

d5 fnc

Density function

Unit

t-Up

Timeout

erCd

AK, Error code

Ct5

CTS, RTS control

ldin

Liquid density input

Unit

C5 in

Internal mass correction

id

Displayed only when the internal mass value correction switch is set
to 1. Refer to "8. Calibration".

Refer to "11. ID Number And GLP Report".

ID number setting

:

Factory settings. Digit is a unit of minimum weighing value.

Caution
The balance may not transmit the data completely at the specified refresh rate, depending

on the baud rate or data added to the weighing data such as time, date and ID number.

36

10.3. Description of the Class "Environment, Display"

Condition ( Cond )

Cond 0 This parameter is for sensitive response to the fluctuation of a mass value. Used

for powder target mass, weighing a very light sample or when quick response

Cond 2 This parameter is for stable weighing with slow response. Used to prevent a mass

Notes In automatic response adjustment, this parameter is selected automatically.

weighing is required. After setting, the balance displays FAST.

value from drifting due to vibration or drafts. After setting, the balance displays

SLOW.

Stability band width ( 5t-b )

This item controls the width to regard a mass value as a stable value. When the

fluctuation per second is less than the parameter, the balance displays the stabilization
indicator and outputs or stores the data. The parameter influences the "Auto print mode"

5t-b 0 This parameter is used for sensitive response of the stabilization indicator. Used

5t-b 2 This parameter ignores slight fluctuations of a mass value. Used to prevent a mass

for exact weighing.

value from drifting due to vibration or drafts.

Zero tracking ( trc )

This function tracks zero point drift caused by changes in the environment and

stabilizes the zero point. When the weighing data is only a few digits, turn the function
off for accurate weighing.

trc 0 The tracking function is not used. Used for weighing a very light sample.
trc 1 The normal tracking function is used.
trc 2 The strong tracking function is used.
trc 3 The very strong tracking function is used. Used for stable zero display.

Display refresh rate ( 5pd )

The period to refresh the display. This parameter influences "Baud rate", "Data output

pause" and the data output rate of "Stream mode".

Decimal point ( pnt )

The decimal point format can be selected.

Auto display-ON ( p-on )

When the AC adapter is plugged in, the display is automatically turned on without the

1ON:OFF

into an automated system. one hour warm up is necessary for accurate weighing.

key operation, to display the weighing mode. Used when the balance is built

37

10.4. Description of the Item "Data Output Mode"

The parameter setting of "Data output mode (prt)" applies to the performance when the

"Data memory (data)" parameter is set to "2" (to store the weighing data) and when the
data is transmitted using the RS-232C interface.

Key mode

When the PRINT key is pressed with the stabilization indictor turned on, the balance

outputs or stores the weighing data and the display blinks one time.

Required setting dout prt 0 Key mode

Auto print modes A and B

When the displayed value is stable and the conditions of "Auto print polarity", "Auto print

difference" and reference value are met, the balance outputs or stores the weighing data.

When the

outputs or stores the data and the display blinks one time.

PRINT key is pressed with the stabilization indictor turned on, the balance

Auto print modes A

Example For weighing each time a sample is placed and removed, with "ar-d"

set to "1" (to adjust zero after the data is output).
Required setting dout prt 1 Auto print mode A (reference = zero)
dout ap-p Auto print polarity
dout ap-b Auto print difference
dout ar-d 1 Zero after output

Auto print modes B

Example For weighing while a sample is added.
Required setting dout prt 2 Auto print mode B (reference = last stable value)
dout ap-p Auto print polarity
dout ap-b Auto print difference

Stream mode

The balance outputs the weighing data continuously regardless of the display condition.

When the display refresh rate is set to 5 times / second (5pd 0), the data output rate is
also set to the same 5 times / second. The display does not blink in this mode. The
interval memory mode is used when the "Data memory (
(to store the weighing data).

Example For monitoring data on a computer.
Required setting dout prt 3 Stream mode
dout data 0 Data memory function is not used

5if bp5 Baud rate

Caution The balance may not transmit the data completely at the specified refresh

rate, depending on the baud rate or data added to the weighing data such
as time, date and ID number.

ba5fnc 5pd Display refresh rate

data)" parameter is set to "1"

38

Interval memory mode

The weighing data is periodically stored in memory.
Example For periodical weighing without a personal computer command and

to output all of the data, to a computer, at one time.

The GH series can use time and date with "

Time/Date output (

5-td

)"

.

Required setting dout prt 3 Interval memory mode
dout data 2 Data memory function is used
dout int Interval time
Optional setting dout 5-td1, 2, or 3 Adds the time and date.

10.5. Description of the Item "Data Format"

A&D standard format 5if type 0

This format is used when the peripheral equipment can receive the A&D format.

If an AD-8121B is used, set the printer to MODE 1 or 2.

This format consists of fifteen or sixteen characters excluding the terminator.

When numerical characters without decimal point are exceeded eight characters for the

GH-252, the format becomes sixteen characters.
A header of two characters indicates the balance condition.
The polarity sign is placed before the data with the leading zeros. If the data is zero, the plus

sign is applied.
The unit, consisting of three characters, follows the data.

C

L

R

F

C

L

g

R

F

ST,+000.1278 g

Header Data Unit Terminator

ST
US
OL

ST,+100.01278

Stable header Stable header of counting mode
Unstable header
Overload header

Header Data Unit Terminator

QT

DP (Dump print) format 5if type 1

This format is used when the peripheral equipment can not receive the A&D format.

If an AD-8121B is used, set the printer to MODE 3.
This format consists of sixteen characters excluding the terminator.
A header of two characters indicates the balance condition. No overload header is used.
The polarity sign is placed before the data, with spaces in place of leading zeros, if the data

is not zero or overloaded.
The unit, consisting of three characters, follows the data.

W T +0 . 1 2 78 g

T

Header Data Unit Terminator

WT
US

Stable header Stable header of counting mode
Unstable header

QT

39

CRL

F

KF format 5if type 2

This is the Karl-Fischer moisture meter format and is used when the peripheral equipment

can only communicate using this format.
This format consists of fourteen characters excluding the terminator.
This format has no header characters.
The polarity sign is placed before the data, with spaces in place of leading zeros, if the data

is not zero or overloaded.
This format outputs the unit only for a stable value.

+ 0.1278 g

Data Unit Terminator

g

CRL

F

Stable value
Unstable value

MT format 5if type 3

A header of two characters indicates the balance condition.
The polarity sign is used only for negative data.
The weighing data uses spaces in place of the leading zeros.
The character length of this format changes dependent upon the unit

S 0.1278 g

Header Data Unit Terminator

S
SD
SI

Stable header
Unstable header
Overload header

CRL

F

NU (numerical) format 5if type 4

This format outputs only numerical data.

This format consists of ten characters excluding the terminator.
The polarity sign is placed before the data with the leading zeros. If the data is zero, the plus

sign is used.

+

+ 0000.1278

Data Terminator

CRL

F

40

CSV format 5if type 5

This format separates the data of A&D standard format and the unit by a comma ( , ).
This format outputs the unit even when the data is overloaded.
When a comma ( , ) is selected for the decimal point, the separators are set to semicolon ( ; ).
When the ID number, data number, time and date are added at "Data output (dout)" of the

function table, outputs ID number, data number, date, time and weighing data in this order

and separates each item by a comma and treats all the items as one group of data.

LAB-0123, No,012, 2004/07/01, 12:34:56, ST,+0000.1278,~~g<CR><LF>

ID number Data number Date Time Weighing data

ST,+000.1278, g

OL,+9999999E+19,

CRL

F

CRL

g

F

ID number dout 5-id 1

The number to identify a specific balance.

This format consists of eight characters excluding the terminator.

LAB-0123

CRL

F

Data number dout d-no 1

This format outputs the data number just before the data is transmitted using the RS-232C

interface.
This format consists of six characters excluding the terminator.
When CSV format (5if type 5) is selected, the period ( . ) is replaced with a comma ( , ).

Data number Terminator

Date dout 5-td 2 or 3

The date output order can be changed in " Time/Date output (5-td)" and "Clock (Cl adj)".

The year is output in a four-digit format.

2004/07/01

CRL

F

Time dout 5-td 1 or 3

This format outputs time in 24-hour format.

12:34:56

CRL

F

41

10.6. Data Format Examples

Stable

A&D
DP
KF
MT
NU

ST, +000 81.72

W

T

+

S

+

000 71.82

07

0

0. 81g27

+

1.82
.0

Unstable

A&D
DP
KF
MT
NU

US, - 0 018 3.96g
US

-

S

-0018 3.96

18 3.96

D

-18 3.96g

-

8

1

Overload

Positive error

A&D
DP
KF
MT
NU

OL , + 9 99 99 9 E 1

H

SI+

[phone]

CRL

F

Overload

Negative error

A&D
DP
KF
MT
NU

Space, ASCII 20h
Carriage Return, ASCII 0Dh
Line Feed, ASCII 0Ah

OL , - 9 9 9 9 9 9 E 1+99

-

L

SI -

-99999999

CRL

F

C

g

L

R

F

CRL

g

1782g

CRL

F

0

3.96

E

E

0

C

L

0

R

F

CRL

9

9

CRL

F

F

C

L

R

F

CRL

F

CRL

F

R

F

F

CRL

F

CRL

L

F

C

R

F

CRL

F

0

CRL

CRL

g

+99

CRL

C

F

L

F

F

L

FCR

42

Units

A&D D.P. KF MT

g

mg

Counting mode

Precent mode

Ounce (

Troy Ounce

Metric Carat

Momme

Pennyweight

Grain

Tael (

Tael (

Tael (

Tael (

Avoir

)

HK general, Singapore

HK, jewelry

Taiwan

)

China

)

g

g

C

P

%

zzo

tt

o zoz

tt

c c

mm o mmo

w

t

d

GG

NN

)

)

t

l

t

l

t

l

t

l

g

g

m

CP

%

o

w

t

d

t

l

t

l

t

l

t

l

g

g m

m

c

s

p

%

z o

t t

oz o z

t t

c c

m mo mo

w

d

t

gG

r N

s

tt

l l

h

t

l l

t

t

l l

c

t

l l

g

m

P

%

d

g

SC

zo

w

t

t

t

t

Tola (

India

)

Messghal

Density

Space, ASCII 20h

t

sm e

DS

t

sme

DS

o

l

t

S

M

DS D S

t

m

43

10.7. Clock and Calendar Function

The balance is equipped with a clock and calendar function. When the "GLP output (info)"

parameter is set to "1" or "2" and the "Time/Date output (5-td)" parameter is set to "1", "2" or
"3", the time and date are added to the output data. Set or confirm the time and date as
follows:

Operation

1 Press and hold the RANGE key until ba5fnc of the function table is displayed in the

weighing mode, then release the key.

2 Press the RANGE key several times to display Cl adj .

3 Press the PRINT key.

The balance enters the mode to confirm or set the time and date.

Confirming the time

4 The current time is displayed with all the digits blinking.
When the time is correct and the date does not need to be confirmed,

press the CAL key and proceed to step 8.

When the time is correct and the date is to be confirmed, press the

1RANGE

When the time is not correct and is to be changed, press the

1RE-ZERO

key and proceed to step 6.

key and proceed to step 5.

Setting the time

5 Set the time in 24-hour format using the following keys.

RANGE key

RE-ZERO (-)key
MODE (+)key
PRINT key

CAL key

........

....

.......

.........

.............

The key to select the digits to change the value.
The selected digits blink.
The key to increase the value by one.
The key to decrease the value by one.
The key to store the new setting, display

end and proceed to step 6.

The key to cancel the new setting and proceed
to step 6.

Confirming the date

6 The current date is displayed with all the digits blinking.
To change the display order of year (y), month (m) and day

(d), press the MODE key. The date is output in the order
as specified.

When the date is correct and the operation is to be finished,

press the CAL key and proceed to step 8.

When the time is to be confirmed again, press the RANGE key and

proceed back to step 4.

When the date is not correct and is to be changed, press

the RE-ZERO key and proceed to step 7.

Store

Proceed to date

confirming mode

Confirm the date or
change the display order

Proceed to date

setting mode

Note The year is expressed using a two-digit format.

For example: The year 2004 is expressed as "04".

44

Setting the date

7 Set the date using the following keys.

RANGE key

RE-ZERO key
MODE key
PRINT key

CAL key

..............

.....

..........

..........

...................

The key to select the digits to change the value.
The selected digits blink.
The key to increase the value by one.
The key to decrease the value by one.
The key to store the new setting, display

end and proceed to step 8.

The key to cancel the new setting and
proceed to step 8.

Quitting the operation

8 The balance displays the next menu item of the function table.

Press the CAL key to exit the clock and calendar function and
return to the weighing mode.

Note Do not enter invalid values such as a non-existing date

when setting the time and date.

When the clock backup battery has been depleted, the

balance displays rtc pf . Under this condition, press
any key and set the time and date. The dead battery only
affects the clock and calendar function. Even so, the
function works normally as long as the AC adapter is
connected to the balance.

Set the date

Store

45

11. ID Number and GLP Report

The ID number is used to identify the balance when Good Laboratory Practice (GLP) is used.
The ID number is maintained in non-volatile memory even if the AC adapter is removed.
The GLP output format is selected at "GLP output (info)" of the function table and can be

output to a personal computer or printer using the RS-232C serial interface.

The GLP output format includes the balance manufacturer, model, serial number, ID number,

date, time and space for signature for weighing data, the weight used and results for
calibration or calibration test data.

The balance can output the following reports for GLP.

"Calibration report" of the calibration, using the internal mass (Calibration due to changes
in temperature and one-touch calibration.)
"Calibration report" of the calibration, using an external weight.
"Calibration test report" of the calibration test, using an external weight.
"Title block" and "End block" for the weighing data.

Calibration and calibration test data can be stored in memory to output several reports at the

same time. Refer to "12. Data Memory" for details.

For details on confirming and setting the time and date for the GH series. Refer to "10.7.

Clock and Calendar Function".

11.1. Setting the ID Number

1 Press and hold the RANGE key until ba5fnc of the function table is displayed, then

release the key.

2 Press the RANGE key several times to display id .

3 Press the PRINT key. Set the ID number using the following keys.
RE-ZERO key

RANGE key
PRINT key
CAL key

4 With ba5fnc displayed, press the CAL key to return to the weighing mode.

.....

........

.........

.............

The key to set the character of the digit selected.
Refer to the display character set shown below.
The key to select the digit to change the value.
The key to store the new ID number and display ba5fnc .
The key to cancel the new ID number and display ba5fnc .

46

11.2. GLP Report

Set the following parameters to output the report.

Refer to "15.2. Connection to peripheral equipment" for connection to an AD-8121B.
To print the report, set the "GLP output (info)" parameter to "1" and use MODE 3 of the

AD-8121B. If MODE1 is used, select temporary dump print mode by pressing the STAT.
key of the AD-8121B.

To output the report to a personal computer using the RS-232C interface, set the "GLP

output (info)" parameter to "2".

If the time and date are not correct set the correct time and date in "Clock (Cl adj)" of the

function table.

Calibration report using the internal mass

Key operation

1 Press the CAL key to display Cal in and calibrate the balance automatically.
2 If GLP output is used, glp is displayed and the calibration report is output.
3 The balance returns to weighing mode after this calibration.

Setting of "info 1" Setting of "info 2"
AD-8121 printer format General format

===========A=&=D

MODEL=====GH-300
S/N=====01234567
ID======LAB-0123
DATE==2004/07/01
TIME====12:34:56
CALIBRATED(INT.)
SIGNATURE

---------------

Space, ASCII 20h

<TERM>

Terminator, CR , LF or CR
CR Carriage return, ASCII 0Dh
LF Line feed, ASCII 0Ah

Manufacturer

Model

Serial number

ID number

Date

Time

Calibration type

Signature

47

Calibration test report using an internal mass

Note Calibration test does not perform calibration.

Key operation

1 Press and hold the CAL key to display CC in and release the key.
2 CC is displayed and the balance is tested automatically.
3 The zero point is measured and the weight value is displayed for a few seconds.
4 Internal mass is weighed and the weight value is displayed for a few seconds.
5 If GLP output is used, glp is displayed and the calibration test report is output.
6 The balance returns to weighing mode after this test.

Commad

This calibration test report can be performed with commad TST.

Setting of "info 1" Setting of "info 2"
AD-8121 printer format General format

-----------A-&-D

MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CAL.TEST(INT.)
ACTUAL

-------0.0000--g

----+200.0002--g

TARGET

----+200.0000--g

SIGNATURE

---------------

Space, ASCII 20h

<TERM>

Terminator, CR , LF or CR
CR Carriage return, ASCII 0Dh
LF Line feed, ASCII 0Ah

Manufacturer

Model

Serial number

ID number

Date
Time

Calibration test type

Zero point value

Target weight value

Target weight

Signature

48

Calibration report using an external weight

Key operation

1 Press and hold the CAL key to display Cal out and release the key.
2 Cal 0 is displayed.
3 When updating the calibration mass value, press the RANGE key and proceed to step 4.

When using preset calibration mass value, proceed to step 5.
4 Specify calibration mass value using the following keys.
RANGE key

RE-ZERO (+)key
MODE (-)key
PRINT key

5 When pressing the RE-ZERO key, the zero point is measured and the weight value is

displayed for a few seconds.
6 Place the displayed mass on the pan. Press the PRINT key to measure the mass and the

weight value is displayed for a few seconds.
7 If GLP output is used, glp is displayed and the calibration report is output.
8 The balance returns to weighing mode after this calibration.

Setting of "info 1" Setting of "info 2"
AD-8121 printer format General format

-----------A-&-D

MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CALIBRATED(EXT.)
CAL.WEIGHT

----+200.0000--g

SIGNATURE

---------------

Space, ASCII 20h

<TERM>
CR Carriage return, ASCII 0Dh
LF Line feed, ASCII 0Ah

........

The key to select the blinking figure

..

The key to increase the value of the blinking figure.

........

The key to decrease the value of the blinking figure.

.........

The key to store the new value.

Manufacturer

Serial number

ID number

Calibration type

Calibration weight

Signature

Terminator, CR , LF or CR

Model

Date
Time

49

Calibration test report using an external weight

Note Calibration test does not perform calibration.

Key operation

1 Press and hold the CAL key to display CC out and release the key.
2 Cal 0 is displayed.
3 When updating the target value, press the RANGE key and proceed to step 4.

When using preset target value, proceed to step 5.
4 Specify calibration mass value using the following keys.
RANGE key

RE-ZERO (+)key
MODE (-)key
PRINT key

5 When pressing the RE-ZERO key, the zero point is measured and the weight value is

displayed for a few seconds.
6 Place the displayed mass on the pan. Press the PRINT key to measure the mass and the

weight value is displayed for a few seconds.
7 If GLP output is used, glp is displayed and the calibration test report is output.
8 The balance returns to weighing mode after this test.

Setting of "info 1" Setting of "info 2"
AD-8121 printer format General format

-----------A-&-D

MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CAL.TEST(EXT.)
ACTUAL

-------0.0000--g

----+200.0002--g

TARGET

----+200.0000--g

SIGNATURE

---------------

Space, ASCII 20h

<TERM>
CR Carriage return, ASCII 0Dh
LF Line feed, ASCII 0Ah

........

The key to select the blinking figure

..

The key to increase the value of the blinking figure.

........

The key to decrease the value of the blinking figure.

.........

The key to store the new value.

Manufacturer

Serial number

ID number

Calibration test type

Zero point value

Target weight value

Target weight

Signature

Terminator, CR , LF or CR

Model

Date
Time

50

Title block and end block

When mass values are recorded as GLP data, a "Title block" is inserted at the beginning and

an "End block" is inserted at the end of a group of mass values in the GLP report.

Notes

To output the report to an AD-8121B , use MODE 3 of the AD-8121B. If MODE1 is used,

select temporary dump print mode by pressing the STAT. key of the AD-8121B.

If the data memory function is used (except data 0), the "Title block" and "End block" can not

be output.

Key operation

1 With the weighing data displayed, press and hold the PRINT key, then release the key.

5tart is displayed. The "Title block" is output.

2 The weighing data is output according to the parameter setting of the data output mode (prt)

of the function table.

3 Press and hold the PRINT key until recend is displayed, then release the key.

The "End block" is output.

Setting of "info 1" Setting of "info 2"
AD-8121 printer format General format

-----------A-&-D

MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
START
TIME----12:34:56

WT--+123.4567--g
WT--+123.4612--g
WT--+123.4623--g
WT--+123.4634--g
WT--+123.4511--g
WT--+123.4534--g
WT--+123.4712--g
WT--+123.4645--g

END
TIME----12:40:15
SIGNATURE

---------------

Space, ASCII 20h

<TERM>

Terminator, CR , LF or CR
CR Carriage return, ASCII 0Dh
LF Line feed, ASCII 0Ah

Title block

Manufacturer

Model

Serial number

ID number

Date

Time

Weighing data

Time

Signature

End block

51

12. Data Memory

Data memory is a function to store weighing data and calibration data in memory. The data

stored in memory are available for outputting at one time to a printer or personal computer.

Weighing data

Calibration report
Internal calibration

External calibration
Calibration test report
Internal test calibration

External test calibration

12.1. Notes on Using Data Memory

To use the memory function, set the "Data memory (data)" parameter and "Time/Date

output (
setting the data memory.

For weighing data, the data contents to be stored and the storage capacity depend on the

"Time/Date output (

If a different type of data exists in memory, "Clr" blinks the upper

left of the display. For example, you want to store weighing data
but calibration data or unit mass data remains in memory.

Under such a condition, before storing data, delete the data in memory as follows:

5-td

)" parameter of the function table. Refer to "10. The Function Table" for details on

Releasing "Clr" or "err"

1 Press and hold the PRINT key until SClr "n"o with "no" blinking is displayed, then release

the key.

2 Press the RE-ZERO key to display SClr "g"o with "go" blinking.
The type of data stored in memory appears in the upper left of the display as shown below:

Weighing data without time and date -d-
Weighing data with time and date d-t
Calibration report Hi5

3 Press the PRINT key to delete all the data in memory.

4 The balance displays end and returns to the weighing mode.

Excluding date and time Up to 200 sets
Including date and time Up to 100 sets

Last 50 sets

5-td

)" parameter setting.

Upper leftof
the display

52

12.2. Data Memory for Weighing Data

The balance can store 200 sets of weighing data in memory (if time and date are added, the

balance can store 100 sets). Even if the AC adapter is removed, the data is maintained in
non-volatile memory.

It is not necessary to connect the printer or personal computer to the balance continually,

because the balance stores the weighing data in memory.
The data in memory can be output at one time to a printer or personal computer.
The data in memory can be displayed on the balance for confirmation.
Data (ID number, data number, time and date) to be added to the output data can be

selected in the function setting.

Storing the weighing data

Note If "

Clr" blinks in the upper left of the display, delete the data in memory.

1 Set the "Data memory (

2 Specify the "Time/Date output (5-td)" parameter whether time and date is to added or not.

3 The storing mode depends on the "Data output mode (prt)" parameter setting.

Four types of storing modes are available to store data.

Key mode

Auto print modes A

Auto print modes B

Interval memory mode

Data number of the data

currently displayed

........................

The data amount

in memory

Memory full

data)" parameter to "1".

When the PRINT key is pressed and the displayed value is
stable, the balance stores the weighing data.

.........

When the displayed value is stable and the conditions of "Auto
print polarity", "Auto print difference" and zero point (reference
value) are met, the balance stores the weighing data.

.........

When the displayed value is stable and the conditions of "Auto
print polarity", "Auto print difference" and last stable data
(reference value) are met, the balance stores the weighing data.

....

Weighing data is stored at an interval specified in "Interval time
(int)". Press the PRINT key to start and stop this mode.

Interval memory

Weighing data

being displayed

Memory data

being displayed

standby indicator

Interval memory

active indicator

Caution

When weighing data is being stored in memory, the data can not be output to a personal

computer using the RS-232C interface.
"fUl" indicates that memory is full or the memory capacity has been reached. More data can

not be stored unless the memory data is deleted.

53

Automatic self calibration can not be used while the interval memory mode is active.
The following commands can not be used during data storage.

Q Query command for weighing data.
S Query command for stable weighing data.
SI Query command for weighing data.
SIR Query command for continuous weighing data.

Setting the function table

Parameter settings for each output mode are as follows:

Item

Mode
Key mode prt 0 Not used data 1
Auto print mode A prt 1 data 1
Auto print mode B prt 2
Interval memory mode prt 3 Not used data 1 int 0-8

Additional parameter settings, as follows:

Data number

ID number

No d-no 0 No 5-td 0
Yes d-no 1 Time only 5-td 1
No 5-id 0 Date only 5-td 2
Yes 5-id 1

Data output

mode

Auto print polarity,

difference

ap-a 0-2
ap-b 0-2

Time and date

Data memory

function

data 1

Both 5-td 3

Interval time

Not used

Enabling the data memory function

1 Press and hold the RANGE key until ba5fnc is displayed, then release the key.

2 Press the RANGE key several times to display dout .

3 Press the PRINT key.

4 Press the RANGE key three times to display data 0 .

5 Press the RE-ZERO key to display data 1 .

6 Press the PRINT key to store the setting.

7 Press the CAL key to return to the weighing mode.

54

Recalling the memory data

Confirm that the "Data memory (data)" parameter is set to "1".

1 Press and hold the

then release the key.

2 Press the PRINT key to enter the memory recall mode. The

type of data appears in the upper left of the display as shown to

the right. Recall the data in memory using the following keys.

RE-ZERO key
MODE key
PRINT key

With RANGE held down, press the CAL key

CAL key

3 Press the CAL key to return to the weighing mode.

.........

.........

.............

PRINT key until reCall is displayed,

.....

To proceed to the next data set.
To go back to the previous data set.
To transmit the current data using the
RS-232C interface.

To delete the current data.
To exit the memory recall mode.

Transmitting all memory data at one time

Confirm that the "Serial interface (5if)" parameters are set properly.

Refer to "10. Function Table" and "15.2. Connection To Peripheral Equipment".

Indicators

Weighing data

without time and date

Weighing data with

time and date

1 Press and hold the PRINT key until reCall is displayed,

then release the key.

2 Press the RANGE key to display out .
3 Press the PRINT key to display out "n"o with "no" blinking.
5 Press the RE-ZERO key to display out "g"o with "go" blinking.

6 Press the PRINT key to transmit all data using the RS-232C

interface.

7 The balance displays Clear when all data is transmitted.

Press the CAL key to return to the weighing mode.

Indicators

Weighing data

without time and date

Weighing data with

time and date

Deleting all memory data at one time

1 Press and hold the PRINT key until reCall is displayed, then release the key.

2 Press the RANGE key several times to display Clear .
3 Press the PRINT key to display Clr "n"o with "no" blinking.
4 Press the RE-ZERO key to display Clr "g"o with "go" blinking.

5 Press the PRINT key to delete all data

6 The balance displays end and returns to the weighing mode.

55

r

12.3. Data Memory for Calibration and Calibration Test

Calibration data (when and how it is performed) and calibration test

data can be stored in memory.
All the data in memory is available to be output at one time to a

printer or personal computer.
Up to 50 data sets of the latest calibration or calibration test can be

stored. When the memory capacity has been reached, "fUl"

illuminates in the upper left of the display as shown below.

Indicato

Storing the calibration and calibration test data

Note If "Clr" appears blinking in the upper left of the display, delete the data in memory.

Store the calibration and calibration test data as follows:
1 Set the "Data memory (data)" parameter to "2".
2 Set the "GLP output (info)" parameter to "1" or "2".

3 With the settings above, each time calibration or calibration test is performed,

the data is stored automatically.

Transmitting the memory data

Note

Confirm that the "Serial interface (5if)" parameters are set properly.

Refer to "10. Function Table" and "15.2. Connection To Peripheral Equipment".
Confirm that the "Data memory (data)" parameter is set to "2".

1 Press and hold the PRINT key until out is displayed, then

release the key.

2 Press the PRINT key to display out "n"o with "no" blinking.
3 Press the RE-ZERO key to display out "g"o with "go" blinking.

4 Press the PRINT key to transmit all memory data using the RS-232C interface.

5 The balance displays Clear when all memory data is output.

Press the CAL key to return to the weighing mode.

In the upper left

of the display

Deleting data stored in memory

1 Press and hold the PRINT key until out is displayed, then release the key.
2 Press the SAMPLE key to display Clear .
3 Press the PRINT key to display Clr "n"o with "no" blinking.

In the upper left

of the display

4 Press the RE-ZERO key to display Clr "g"o with "go" blinking.

5 Press the PRINT key to delete all data.

6 The balance displays out and returns to the weighing mode

when all the data has been deleted.

56

13. Underhook

The underhook can be used for magnetic materials or density measurement. The built-in

underhook is revealed by removing the cap on the bottom of the balance. Use the

underhook as shown below.

Caution

Do not apply excessive force to the underhook.
When not in use, attach the cap to prevent dust

from getting into the balance.
Do not push the underhook upward
When turning the balance over, the weighing pan,

pan support, breeze break ring and dust plate

will fall off. Remove them first.
When the cap is removed, a weighing error may

occur, because of drafts entering into the

internal portion of the balance. Arrange the room

condition.

1 Remove the cap on the bottom of the balance.

2 Hang your weighing pan on the underhook.

Place the balance on the solid table.

Solid table

Underhook

Cap

Bottom

Weighing pan

57

A

A

14. Density Measurement

The balance is equipped with a density mode. It calculates the density of a solid using the

mass value of a sample in air and the mass value in liquid.

Note

The density mode was not selected for use when the balance was shipped from the factory.

To use the mode, change the function table and activate the density mode.
When the density mode is selected, the response adjustment function can not be used.
Minimum display is 0.0001 g while density mode.

Formula to obtain the density

The density can be obtained by the following formula.
Where ρ : Density of a sample
A : Mass value of a sample in air
B : Mass value of a sample in liquid
ρ0 : Density of a liquid

ρ = x ρ0

- B

Prior to measurement: Changing the function table

Prior to measurement, change the function table as follows:

1 Selecting the density mode.
The density mode is available as one of the weighing units.

Select it by pressing the MODE key. To use the mode, select it (unit of Unit d .) in the

function table. Refer to "5.2. Changing Units".

2 Selecting a way to set the density of a liquid.
Select the liquid density input method from the function table below.

Note

The function table is available only when the density mode (d5fnc) is selected. d5fnc is

displayed next 5if when density mode is active at Unit.

Class Item and Parameter Description

0 Water temperature d5 fnc

1 Liquid density

is

factory setting.

Density function

ldin

Liquid density input

58

Entering the density of a liquid

Two ways to set the density of a liquid are available in the function table, "Liquid density input

(ldin): by entering the water temperature or by entering the density directly.

1 Press the MODE key as necessary to select the density mode. When

the density mode begins, "g (gram)" is displayed and the processing

indicator ( ) blinks.

Entering the water temperature (ldin 0)

2 The water temperature currently set (unit:°C, factory setting : 25°C) is

displayed. Use the following keys to change the value.

RE-ZERO (+)key..The key to increase the temperature by one degree.

(0°C is displayed after 99°C)

MODE (-)key ........ The key to decrease the temperature by one degree.

(99°C is displayed after 0°C)

PRINT key ......... The key to store new water temperature, display end and

return to the density mode. Proceed to Step 1.

CAL key............. The key to cancel the change and return to the density mode.

Proceed to Step 1.

The relation between the water temperature and density

°C +0 +1 +2 +3 +4 +5 +6 +7 +8 +9

0 0.99984 0.99990 0.99994 0.99996 0.99997 0.99996 0.99994 0.99990 0.99985 0.99978
10 0.99970 0.99961 0.99949 0.99938 0.99924 0.99910 0.99894 0.99877 0.99860 0.99841
20 0.99820 0.99799 0.99777 0.99754 0.99730 0.99704 0.99678 0.99651 0.99623 0.99594
30 0.99565 0.99534 0.99503 0.99470 0.99437 0.99403 0.99368 0.99333 0.99297 0.99259
40 0.99222 0.99183 0.99144 0.99104 0.99063 0.99021 0.98979 0.98936 0.98893 0.98849
50 0.98804 0.98758 0.98712 0.98665 0.98618 0.98570 0.98521 0.98471 0.98422 0.98371
60 0.98320 0.98268 0.98216 0.98163 0.98110 0.98055 0.98001 0.97946 0.97890 0.97834
70 0.97777 0.97720 0.97662 0.97603 0.97544 0.97485 0.97425 0.97364 0.97303 0.97242
80 0.97180 0.97117 0.97054 0.96991 0.96927 0.96862 0.96797 0.96731 0.96665 0.96600
90 0.96532 0.96465 0.96397 0.96328 0.96259 0.96190 0.96120 0.96050 0.95979 0.95906

Entering the density directly (ldin 1)

The density currently set (unit : g / cm3, factory setting : 1.0000g / cm3) is displayed.
Use the following keys to change the value.
The range to set the density is 0.0000g / cm3 to 1.9999g / cm3.

RE-ZERO1(+)key..The key to set the value of the digit selected.

RANGE1(-)key

PRINT key

CAL key

59

......

.........

.............

The key to select the digit to change the value.

The key to store the change, display end and return to the density
mode. Proceed to Step 1.

The key to cancel the change and return to the density mode. Proceed to
Step 1.

Measuring the density

Note If the liquid temperature or the type of liquid is changed during measurement,

input again the value of the liquid density as necessary.

Density display is four decimal places. Minimum display can not change with

the RANGE key.

Denisty is displayed after "Mass measurement in air" and "Mass measurement in liquid".
The procedure of each measurements is as follows:

1 Enter the density mode that "g (gram)" is

displayed and the processing indicator ( )
blinks. Place nothing on both pan and press the

1RE-ZERO

key to display zero.

2 Place the sample on the pan in air.

If the weight value is stored or output, press the

PRINT

key to store it after a stable weight value
is displayed.
Press the RANGE key to decide the weight
value in air and proceed to next step.

Note If negative value or E (out of range) is

displayed, the RANGE key is inactive.

3 Move the sample to the pan in liquid.

If the weight value is stored or output, press the

PRINT

key to store it after a stable weight value
is displayed.
Press the RANGE key to decide the weight
value in liquid and proceed to next step.

Note If E (out of range) is displayed, the RANGE

key is inactive.

4 If the density value is stored or output, press the

PRINT

key to store it.
Press the RANGE key to measure other
sample and proceed to step 2.

5 If the liquid temperature or the type of liquid is

changed during measurement, input again the
value of the liquid density as necessary.

6 Press the

MODE key to proceed to other

modes.

Weighing in air.
g lights. blinks.

Place sample on the pan in
air

Weighing in air.
g lights. blinks.

Output or store

Move sample from the pan in

Weighing in liquid.
g lights. lights.

Output or store

Density display.
g turns off. lights.

Output or store

From "Entering the
density of a liquid"

air to the pan in liquid

Remove sample

60

t

15. Standard Input and Output Interface

15.1. RS-232C Interface

The balance is a DCE device. Connect the balance to a personal computer (DTE) using a

straight through cable.

Transmission system : EIA RS-232C
Transmission form : Asynchronous, bi-directional, half duplex
Transmission rate : 10 times/second or 5 times/second (same as data refresh rate)
Data format : Baud rate : 600, 1200, 2400, 4800, 9600, 19200bps
Data bits : 7 or 8 bits
Parity : Even, Odd (Data bits 7 bits)
None (Data bits 8 bits)
Stop bit : 1 bit
Code : ASCII

Startbi

Data bits

Stop bit

Parity bit

RS-232C

-5V to -15V
+5V to +15V

D-Sub 25 pin assignments

Pin No. Signal name Direction Description

1
2 TXD Output Transmit data
3 RXD Input Receive data
4
5 SG - Signal ground
6 DSR Output Data set ready
7 RTS Input Request to send
8 CTS Output Clear to send
9

Signal names of the balance side are the same as

the DTE side with TXD and RXD reversed.

-

-

-

Balance side

DCE

+5V

3.3kΩ

-

-

-

TXD 2

RXD 3

RTS 7

CTS 8

DSR 6

SG 5

No connection

No connection

No connection

#4-40UNC

Computer side

DTE

RXD

TXD

RTS

CTS

DSR

SG

Inside of balance

61

Terminal example

15.2. Connection to Peripheral Equipment

Connection to an AD-8121B printer

Preset the following parameters to use the AD-8121B printer.

Factory
settings

0 0,1,2 3 0,1,2

0

1

0 0 0 0,1

0 0 0 0,1,2,3

0 0 0 0,1

0 0 0 0,1 #2

0 0 0 0,1

2 2 2 2

0 0 0 0

0 0 0 0

0 0 0 1

0 0 0 0

dout

Data output

5if

Serial
interface

Class Item and Parameter

prt

Data output mode

ap-p

Auto print polarity

ap-b

Auto print difference

d-no

Data number output

5-td

Time/Date output

5-id

ID number output

pU5e

Data output pause

at-f

Auto feed

bp5

Baud rate

btpr

Data bit, parity bit

Crlf

Terminator

type

Data format

Ct5

CTS, RTS control

#1 Set parameters when auto print mode A or B (prt 1 or 2) is selected.
#2 Set 1 when multiple lines are printed. Example: When appending ID number, set 1.

Notes

Refer to "11.2. GLP Report" concerning print samples.
Settings of AD-8121B

MODE

MODE 1

MODE 2

MODE 3

DIP switch No.3 : Handling unstable data

AD-8121B
DIP switch

MODE

ON

1 2 3 4

1 2 3 4

1 2 3 4

ON

ON

MODE

MODE

Print at receiving data.
Standard mode, statistic mode

Print by DATA key operation or built-in timer.
Standard mode, interval mode, chart mode

Print at receiving data.
Dump print mode

MODE

ON Print
OFF Not printed
DIP switch No.4 : Data input specifications (Interface selection)
ON Current loop

MODE

OFF RS-232C

AD-8121B

MODE 1

#1

Description

ON

1 2 3 4

ON

1 2 3 4

AD-8121B

MODE 2

Not

necessary

AD-8121B

MODE 3

#1

62

Connection to a computer and the use of WinCT

The balance is of the DCE type (Data Communication Equipment), which can be connected

to a personal computer using the RS-232C interface. Before connection, read the personal
computer manual thoroughly. Use a standard DCE cable for connection (cable type:
straight-through).

Using Windows Communication Tools Software (WinCT)

When Windows is used as an operating system in a personal computer, the provided WinCT

software can be used to transmit the weighing data to the personal computer.

The WinCT software has two communication methods: "RsCom" and "RsKey". Refer to the

WinCT instruction manual.

The current version of the WinCT can be downloaded from the A&D website.

RsCom

RsCom can transmit commands to control the balance.
RsCom can make bi-directional communication between the balance and a personal

computer using the RS-232C interface.

RsCom can display or store the data using a text file format. RsCom can also print the data

using a printer connected to the personal computer.

When several ports of a personal computer have balances connected, the personal

computer can communicate with each balance simultaneously.

RsCom can share a personal computer with other application software.
RsCom can receive the balance GLP report.

RsKey

RsKey can transmit the weighing data output from the balance directly to other application

software such as Microsoft Excel.

RsKey can be used with most application software.
RsKey can receive the balance GLP report.

Using the WinCT software, the balance can do the following:

Analyzing the weighing data and the statistics input by "RsKey"

The weighing data can be input directly into an Excel worksheet. Then, Excel can analyze

the data to obtain total, average, standard deviation, maximum and minimum value, and
display them in a graph.

Controlling the balance using commands from a personal computer

By using "RsCom", the personal computer sends commands such as "re-zero" or "send

weighing data" to the balance and controls the balance.

Printing the balance GLP report using your printer

The balance GLP report can be printed using a printer connected to the personal computer.

Receiving weighing data at a certain interval

The weighing data can be received at a certain interval and data characteristic with elapsed

time can be obtained.

Using the balance memory function

The data can be stored in the balance’s memory. Of the data stored, the weighing data and

calibration data can be transmitted to a personal computer at one time.

Using a personal computer as an external indicator

With the "RsKey" test mode function, a personal computer can be used as an external weight

indicator for the balance. (To do this, set the balance data output mode to stream mode.)

63

15.3. Commands

15.3.1. Command List

Note A command has a terminator added, that is specified using "5if Crlf" of the

function table, and is sent to the balance.

Commands to query weighing data

C Cancels the S or SIR command.
Q Requests the weighing data immediately.
S Requests the weighing data when stabilized.
SI Requests the weighing data immediately.
SIR Requests the weighing data continuously.

Commands to control the balance

CAL

OFF
ON
P
PRT
R
RNG
TR
TST
U

Commands to request data

?ID
?PT
?SN
?TN

Command to set data

PT:∗∗∗.∗∗∗∗ g

(Note 1)

R command assumes the point as zero and sets the display to zero.
TR command cancels the tare weight when the displayed value is greater than zero.

The canceled tare value can be read using the ?PT command.

PT: command sets the tare value digitally.

An example of this command sets a negative target value and fills with the sample
until the display becomes zero.

For details, refer to page 69.

Same as the 1CAL1 key.
Turns the display off.
Turns the display on.
Same as the ON:OFF key
Same as the PRINT key
Same as the RE-ZERO key

(Note 1)

Same as the RANGE key.
Tares the balance (Cancels the container’s weight.)
Perform calibration test.
Same as the MODE key

Requests the identification number.
Outputs the tare value.

(Note 1)

Request the serial number of the balance.
Request the model name of the balance.

(Note 1)

Sets the tare value.

Step 1 Place a container.
Step 2 Set the display to zero using the R command.
Step 3 Set a target value using the PT: command.

(Note 1)

64

15.3.2. Acknowledge Code and Error Codes

When the "Serial interface function (5if)" parameter is set to "erCd 1", the balance outputs

<AK> code or error code to each command as follows:

<AK> (06h) Acknowledge in ASCII code.

When the balance receives a command to request data and can not process it, the balance

transmits an error code (EC, Exx).

When the balance receives a command to request data and can process it, the balance

outputs the data.

When the balance receives a command to control the balance and can not process it, the

balance transmits an error code (EC, Exx).

When the balance receives a command to control the balance and can process it, the

balance transmits the acknowledge code.

Among commands to control the balance, the following transmit the acknowledge code

both when the balance receives the command and when the balance has accomplished
the command. If the command can not be processed properly, the balance transmits an
error code (EC, Exx). This error can be released using the CAL command.

CAL command (Calibration command using internal mass)

ON command (Display ON command)
P command (Display ON/OFF command)
R command (RE-ZERO command)
TR command (Tare command)

TST command (Calibration test command)

When a communication error has occurred due to external noise, or a parity error has

occurred due to transmission error, the balance transmits an error code. In this case, send
the command again.

xx is error code number.

15.3.3. Control Using CTS and RTS

Depending on the "Ct5" parameter of "Serial interface (5if)", the balance performs as follows:

Ct5 0

Regardless of whether the balance can receive a command or not, the balance keeps the

CTS line HI. The balance outputs data regardless of the condition of the RTS line.

Ct5 1

The CTS line is kept Hi normally. When the balance can not receive the next command

(Example: while the balance is processing the last command), the balance sets the CTS line
to Lo. The balance confirms the level of the RTS line before outputting a set of data. If the
RTS level is Hi, the balance outputs data. If the RTS level is Lo, data is not output (The data
is canceled).

15.3.4. Settings Related to RS-232C

Concerning the RS-232C, the balance has two functions: "Data output (dout)" and "Serial

interface (5if)". Set each function as necessary.

65

15.3.5. Command Examples

This example uses the "erCd 1" of "5if" so that the <AK> (06h) code is output.

ON command (turning on the balance)

Computer Time Balance

ON command

Standby mode

Command received

All segments

R command (Re-zeroing the display)

Computer Time Balance

R command

All segments are displayed

Command completed

Zero display

Weighing mode

Command received

In process

Command completed

Zero display

66

CAL command (Calibration with internal mass)

Computer Time Balance

CAL command

Zero display

Command received

Command completed

Zero display

Error code

This example is of an error using the R command. "erCd 1" is used. The balance transmits an

error code when the received command can not be achieved.

Computer Time Balance

R command

CAL command

Weighing mode (unstable)

Command received

In process

When the R command can not be
achieved due to unstable weighing:

Error code

When the CAL command is received,
the balance returns to the weighing
mode

Command completed

Weighing mode

67

Weighing with a tare

This example uses "erCd 1" of "5if" so that the <AK> (06h) code is output.

Computer Time Balance

R command

TR command

S command

?PT command

？ＰＴ

ＴＲ

Ｓ

ＳＴ，＋０１０．００００　　ｇ

(Net value)

ＰＴ，＋０１２．３４５６　　ｇ

(Tare value)

Sets the display to zero

Command received

In process

Command completed

Zero display

Place a container

Tares

Command received

In process

Command completed

Zero display

68

Setting a negative target value and filling with a sample until
the display becomes zero

This example uses "erCd 1" of "5if" so that the <AK> (06h) code is output.

Computer Time Balance

R command

PT: command to set a target weight of 10 g

Place a container

Before command
execution

Command received

In process

Command completed

Zero display

Command received

Target weight display

Fill with sample until
the display becomes
zero

69

16. Maintenance

16.1. Treatment of the Balance

Clean the balance with a lint free cloth that is moistened with warm water and a mild

detergent.

Do not use organic solvents to clean the balance.
Do not disassemble the balance. Contact the local A&D dealer if the balance needs

service or repair.

Use the original packing material for transportation.
Consider "3. Precautions" when operation the balance.

16.2. Error Codes

Display Error code Description

Stability error

The balance can not stabilize due to an environmental

EC,E11

EC,E16

EC,E17

EC,E20

EC,E21

problem. Check around the pan. Prevent vibration, drafts,
temperature changes, static electricity and magnetic fields,
from influencing the balance.
To return to the weighing mode, press the 1CAL1 key.

Internal mass error

Applying the internal mass does not yield a change in the
mass value as specified.
Confirm that there is nothing on the pan and perform the
weighing operation from the beginning again.

Internal mass error

The internal mass application mechanism does not function
properly. Perform the weighing operation from the beginning
again.

Calibration weight error

The calibration weight is too heavy. Confirm the calibration
mass value. Press the 1CAL1 key to return to the weighing
mode.

Calibration weight error

The calibration weight is too light. Confirm the calibration
mass value. Press the 1CAL1 key to return to the weighing
mode.

Overload error

A sample beyond the balance weighing capacity has been
placed on the pan. Remove the sample from the pan.

Weighing pan Error

The mass value is too light.
Confirm that the weighing pan is properly installed and
calibrate the balance.

70

Display Error code Description

Sample mass error

The balance can not store the sample for the counting mode
or for the percent mode because it is too light.
Use a larger sample.

Unit mass error

The sample unit mass for the counting mode is too light.
Storing and using it for counting will cause a counting error.
Add samples to reach the specified number and press the

1PRINT1 key. Pressing the 1PRINT1 key without adding

samples will shift the balance to the counting mode. But, for
accurate counting, be sure to add samples.

Automatic response adjustment zero error

The automatic response adjustment can not be performed
because there is something on the pan. Clear the pan. Press
the 1CAL1 key to return to the weighing mode.

Automatic response adjustment unstable error

The automatic response adjustment can not be performed
because the mass value is unstable.

(Check NG)

Check the ambient conditions such as breeze, vibration and
magnetic fields, also check the weighing pan.
Press the 1CAL1 key to return to the weighing mode.

Clock battery error

The clock backup battery has been depleted.
Press any key and set the time and date. The clock and
calendar function works normally as long as the AC adapter
is connected to the balance. If this error appears frequently,
contact the local A&D dealer.

Memory full

The amount of weighing data in memory has reached the

"f"U"

l

(Blinking)

maximum capacity. Delete data in memory to store new data.
For details, refer to "12. Data Memory".

Memory full

The amount of calibration or calibration test data in memory

fUl

(Illuminated)

has reached the maximum capacity (50 sets).
The data in memory will be deleted automatically to store new
data. For details, refer to "12. Data Memory".

Memory type error

"C"l"

r

Type of memory set in the function table and type of data
stored are different. For details, refer to "12. Data Memory".

Memory data error

The stored data were destroyed. To use the memory
function, erase all the old data and release the error. For
details, refer to "12.1. Notes on Using Data Memory".

71

Display Error code Description

Communications error

EC,E00

EC,E01

EC,E02

EC,E03

EC,E04

EC,E06

EC,E07

Other error code

A protocol error occurred in communications.
Confirm the format, baud rate and parity.

Undefined command error

An undefined command was received.
Confirm the command.

Not ready

A received command can not be processed.
Example:

The balance received a "Q" command, but not in the

weighing mode.

The balance received a "Q" command while processing a

RE-ZERO command. Adjust the delay time to transmit a
command.

Timeout error

If the timeout parameter is set to "t-Up1", the balance did not
receive the next character of a command within the time limit
of one second. Confirm the communication.

Excess characters error

The balance received excessive characters in a command.
Confirm the command.

Format error

A command includes incorrect data.
Example:

The data is numerically incorrect.

Confirm the command.

Parameter setting error

The received data exceeds the range that the balance can
accept. Confirm the parameter range of the command.
If an error described above can not be released or other
errors are displayed, contact the local A&D dealer.

16.3. Other Display

When this indicator blinks, automatic self calibration is required. The

indicator blinks when the balance detects changes in ambient
temperature. If the balance is not used for several minutes with this
indicator blinking, the balance performs automatic self calibration. The
blinking period depends on the operating environment.

Advise The balance can be used while this indicator is blinking. We

recommend that you perform automatic self calibration for precision
weighing.

72

16.4. Checking the Balance Performance and Environment

The balance is a precision instrument. When the operating environment or the operating

method is inadequate, correct weighing can not be performed. Place a sample on the pan
and remove it, and repeat this several times. If the balance seems to have a problem with
repeatability or to perform improperly, check as described below. If improper performance
persists after checking, contact the local A&D dealer for repair.

Checking that the operating environment or weighing method
is proper

Operating environment

Is the weighing table solid enough?
Is the balance level?
Is the operating environment free from vibration and drafts?
Is there a strong electrical or magnetic noise source such as a motor near the balance?

Weighing method

Does the weighing pan rim touch anything? Is the weighing pan assembly installed

correctly?

Is the RE-ZERO key pressed before placing a sample on the weighing pan?
Is the sample placed in the center of the weighing pan?
Is the fine range breeze break ring installed for weighing with a minimum display of 0.01 mg

for the GH-252 and GH-202?

Has the balance been calibrated using the internal mass (one-touch calibration)?
Has the balance been warmed up for one hour before weighing?

Sample and container

Has the sample absorbed or lost moisture due to the ambient conditions such as

temperature and humidity?

Has the temperature of the container been allowed to equalize to the ambient temperature?
Is the sample charged with static electricity?
Is the sample of magnetic material such as iron? There are cautions about weighing

magnetic materials.

Checking that the balance performs properly

Check the balance performance using an external weight. Be sure to place the weight in the

center of the weighing pan.

Check the balance repeatability, linearity and calibrated value using external weights with a

known value.

16.5. Asking for Repair

If the balance needs service or repair, contact your local A&D dealer.
The balance is a precision instrument. Use much care when handling the balance and

observe the following when transporting the balance.

Use the original packing material for transportation.
Remove the weighing pan, pan support, breeze break ring and dust plate from the main unit.

73

17. Specifications

GH-120 GH-200 GH-300 GH-202 GH-252

Weighing capacity 120 g 220 g 320 g

Maximum display

Minimum display 0.1 mg

(Standard deviation)

Linearity ±0.2 mg ±0.3 mg

(Typical at FAST)

Sensitivity drift,

10°C to 30°C / 50°F to 86°F
Operating environment 5°C to 40°C, 85%RH or less (No condensation)
Display refresh rate 5 times/second or 10 times/second

Minimum unit
mass
Number of

mode

Counting

samples
Minimum 100%
reference mass
Minimum 100%

mode

Percent

display

Interface RS-232C with Windows Communication Tools Software WinCT

External calibration
weight

Weighing pan φ90 mm
External dimensions 217(W) x 442(D) x 316(H) mm

Power supply &
AC adapter type

Mass Approx. 8.2 kg

The operating environment does not include excessive change of ambient temperature,

humidity, vibration, drafts, magnetic fields and static electricity.

The internal mass may change due to corrosion or other damage caused by the operating

environment, or due to aging. Check the internal mass periodically and correct the internal
mass value if necessary.

120.0084 g 220.0084 g 320.0084 g

0.1 mg 0.2mg

Approx. 3.5 seconds

±2 ppm/°C

0.1 mg

10, 25, 50 or 100 pieces

10.0 mg

0.01 %, 0.1 %, 1 % (Depends on the reference mass stored.)

100g

50g

Power consumption: Approx. 11VA (supplied to the AC adapter )

Confirm that the adapter type is correct for the local voltage and

200g
100g

power receptacle type.

300g
200g
100g

220 g 250 g

51 g 101 g

220.0084 g 250.0084 g

51.00009 g 101.00009 g

0.1 mg

0.01 mg

0.1 mg Repeatability

0.02 mg 0.03 mg
±0.2 mg

±0.03 mg ±0.10 mg

Approx. 3.5 seconds Stabilization time

Approx. 8 seconds

200g
100g

50g
20g

74

17.1. External Dimensions

Unit: mm

75

17.2. Options and Peripheral Equipment

GH-02 USB interface

The interface to connect a balance to a personal computer,

and is used to transmit the balance weight data to the
personal computer via USB. Applicable OS is Windows 98 or
later.

As the Windows standard driver is used to transmit the

weighing data, complicated installation of a dedicated driver
is not necessary.

The balance weighing data can be transmitted to

applications such as Excel, Word and memo pad for
Windows automatically.

To perform bi-directional communications using WinCT or to

output GLP data to a personal computer by using the
personal computer USB interface, use the AX-USB-9P USB
converter.

GH-08 Ethernet Interface

The interface to connect the balance to a LAN.
Accessory: The "WinCT-Plus" data communication software.

The software can acquire data from multiple balances

connected to a LAN.
The software can control these balances with commands.
The software can acquire data transmitted from balances.

Example: When pressing the PRINT key of the balance,

data is output and is acquired by the computer.
The stored data can be used with Microsoft EXCEL (if installed).

AD-8121B Printer

Compact dot-matrix printer
Statistical function, clock and calendar function, interval

print function, graphic print function, dump print mode
5 x 7 dots, 16 characters per line
Print paper (AX-PP143, 45 (W) x 50 (L) mm , ø65 mm)
AC adapter or alkaline battery

76

(

)

AD-1653 Density Determination Kit

Weigh in water - Weigh in the air

Example

10.0000 g － 9.5334 g

Temperature Water density
0°C 0.99984 g/cm3
10°C 0.99970 g/cm3
20°C 0.99820 g/cm3
30°C 0.99565 g/cm3

Weigh in air

10.0000 g

x water density = sample density

x 0.9970 g/cm3 = 21.4 g/cm3

AD-1683 DC Static Eliminator

The eliminator is able to dissipate static electricity on a

charged sample.
The eliminator does not use a ventilator and can be used

in precision powder weighting.

AX-USB-9P-EX USB Converter

Adds a COM port to a PC.
Enables bi-directional communication between the PC and the balance when a USB driver is

installed.
Can use serial communication software such as WinCT on a PC without COM ports.
An RS-232C cable is provided to connect the USB converter to the balance.

RS-232C

on the GH series

balance

RS-232C cable provided

D-sub 9-pin

USB serial

converter

To USB port

on a PC

77

AX-T-314A-S External key Plug

This plug produces the same operations as

pressing the RE-ZERO and PRINT keys. It

enables remote control of the balance using

an external switch.

This operation must connect the GND line to

the PRINT or RE-ZERO line for at least 100

miliseconds.

AX-SW128 Foot switch

The switch can be used to connect the

external key plug and used to the RE-ZERO

or PRINT keys.

Note When the foot switch is to be used,

prepare the AX-SW128 and AX-T-314A-S
beforehand.

External key Plug

AX-T-314A-S

Terminal

Foot switch
AX-SW128

78

Other options

Order code Name and description

AD-1682

AD-1684

AD-1685

AD-1689

AD-8526

AD-8920

AD-8922

Rechargeable Battery

This option allows use of the balance in a place where AC power is

not available.

Electrostatic field meter

This option measures the amount of the static charge on the

sample, tare or peripheral equipment and displays the result.
If those are found to be charged, discharge them using the AD-1683
DC static eliminator.

Anti-vibration table

This option can be used when the balance has difficulty stabilizing,

due to vibration coming from the floor.
As the table has a high vibration absorbing property, key operations
on the balance may make the top of the table tilt slightly, causing a
weighing error. To avoid this, use the AD-8922 remote controller to
control the balance.

Tweezers for calibration weight

This option is the same as the tweezers provided as a standard

accessory and is used when calibrating the balance using an
external weight.

LAN Converter

This option can be used to connect the RS-232C interface of the

balance to the Ethernet (LAN) port of a computer. This allows
management of the balance weighing data with a computer
connected to a network.

Remote Display

This option can be connected to the balance using the RS-232C

interface.

Remote Controller

This option can be connected to the balance using the RS-232C

interface and can control the balance remotely.

Various options such as comparator output or analog output are

available.

79

18. Terms/Index

18.1. Terms

Calibration Adjustment of the balance so that it can weigh accurately.

Calibration weight A weight used for calibration

Data number Numbers assigned sequentially when weighing data or unit weight is

stored.

Digit The minimum weighing value available. Used for the balance, one digit

is the smallest mass that can be displayed.

Environment Ambient conditions such as vibration, drafts, temperature, static

electricity and magnetic fields which affect the weighing operation.

External weight The weight that you have.

GLP Good Laboratory Practice.

GMP Good Manufacturing Practice

Internal mass Built-in calibration weight

ISO International Organization for Standardization

Repeatability Variation in measured values obtained when the same mass is placed

and removed repetitively. Usually expressed as a standard deviation.
Example: Standard deviation = 1 digit: This means that measured
values, obtained when the same sample is placed and removed
repetitively, fall within ±1 digit in the frequency of about 68%.

Re-zero To set the display to zero.

Sensitivity drift An affect that a change in temperature causes to the weighing data.

Expressed as a temperature coefficient.
Example: Temperature coefficient = 2 ppm/°C : If a load is 10 g and the
temperature changes by 10°C, the value displayed changes by the
following value.

0.0002%/°C x 10°C x 10g = 0.0002 g

Stabilization time Time required after a sample being placed, until the stabilization

indicator illuminates and the weighing data is displayed.

Tare To cancel the mass value of a container which is not to be included in

the weighing data. Normally, refers to an operation of placing a
container and setting the display to zero.

Target mass An external weight used for calibration test

Zero point A weighing reference point. Usually refers to the value displayed when

nothing is on the weighing pan.

80

18.2. Index

% Unit of percent mode ................... 20

CAL key ................................. 10, 31

MODE key ................................... 10

ON OFF key................................. 10

PRINT key.............................. 10, 31

RANGE key ........................... 10, 31

RE-ZERO key........................ 10, 31

Data number.................... 10, 41, 53

Interval memory mode........... 10, 53

Prior notice indicator.............. 10, 24

Process indicator ......................... 10

Response indicator ......... 10

Space mark.... 42, 47, 48, 49, 50, 51

Stabilization indicator....... 10, 16, 31

Standby indicator ......................... 10

A&D format ..................................................... 39

AC adapter ................................................. 6, 74

ACAI Function.................................................. 19

AD-1653 Density determination kit ............. 77

AD-1682 Rechargeable battery .................. 79

AD-1683 DC static eliminator...................... 77

AD-1684 Electrostatic field meter ............... 79

AD-1685 Anti-vibration table ....................... 79

AD-1689 Tweezers for calibration weight... 79

AD-8121B Printer........................................... 76

AD-8526 LAN converter.............................. 79

AD-8920 Remote display ............................ 79

AD-8922 Remote controller ........................ 79

AK code ..................................................... 65

ap-b
ap-p

Auto print polarity............. 34, 38, 62

ar-d

Zero after output .......................... 35

at-f

Auto feed................................ 35, 62

AX-SW128 Foot switch ................................. 78

AX-T-314A-S External key plug.................... 78

AX-USB-9P-EX USB converter .................... 77

ba5fnc
bp5

Baud rate ............................... 35, 62

btpr

Data bit, parity bit ................... 35, 62

C5 in

-

Cal e
Cal e
Cal in
Cal out

Calibration ......................................... 23, 27, 80

Calibration test ................................................. 23

CC in

Auto print difference

Environment display .............. 31, 34

Internal mass correction .............. 28

Calibration weight error ............... 70

Calibration weight error ............... 70

One-touch calibration .................. 24

Calibration using an external weight

Calibration test ............................. 25

............ 34, 38, 62

.. 26

CC out
CH 0
Cl adj
Clr
Cond
Crlf
C5 in

CSV format ..................................................... 41

Ct5

CTS ..................................................... 65

-d­data

Data number .................................................... 80

Digit ..................................................... 80

d-no
dout
d5 fnc
d-t

Dump print ..................................................... 39

-e Weighing pan Error...................... 70

e

EC,E00 Communications error ................. 72

EC,E01 Undefined command error........... 72

EC,E02 Not ready ..................................... 72

EC,E03 Timeout error................................ 72

EC,E04 Excess characters error............... 72

EC,E06 Format error ................................. 72

EC,E07 Parameter setting error................ 72

EC,E11 Stability error ................................ 70

EC,E16 Internal mass error....................... 70

EC,E17 Internal mass error....................... 70

EC,E20 Calibration weight error................ 70

EC,E21 Calibration weight error................ 70

erCd
error 1
error 6
error 7

Error code ..................................................... 70

External weight .......................................... 23, 80

FAST ..................................................... 21

FCC ....................................................... 4

fUl

GH-02 USB interface............................... 76

GH-08 Ethernet Interface ........................ 76

GLP ..................................................... 80

GMP ..................................................... 80

Hi5
id

ID Number ............................................... 41, 46

info
int

KF format ..................................................... 40

ldin
lo

MID. ..................................................... 21

MT format ..................................................... 40

Calibration test ............................. 27

Response error ............................ 71

Clock ............................................ 34

Initializing the balance ................. 30

Condition ..........................21, 34, 37

Terminator .............................. 35, 62

Internal mass correction .............. 36

CTS, RTS control................... 36, 62

Weighing data with calender ....... 52

Data memory ............................... 34

Data number output..................... 35

Data output ...................... 34, 35, 38

Density function ........................... 36

Weighing data.............................. 52

Overload error.............................. 70

AK, Error code ............................. 36

Stability error ................................ 70

Internal mass error....................... 70

Internal mass error....................... 70

Memory full ...................... 53, 56, 71

Calibration report ......................... 52

ID number setting ........................ 36

GLP output................................... 35

Interval time.................................. 35

Liquid density input ...................... 36

Sample mass error ...................... 71

81

Numerical format ............................................. 40

Options ..................................................... 76

out

Report output ......................... 55, 56

p5

Internal mass correction .............. 30

pnt

Decimal point ......................... 34, 37

p-on

Auto display-ON .................... 34, 37

prt

Data output mode ............ 34, 38, 62

pU5e

Data output pause ................. 35, 62

recend

Repeatability .............................................. 74, 80

Re-zero ..................................................... 80

RsCom ..................................................... 63

RsKey ..................................................... 63

rtc

RTS ..................................................... 65

5-id
5if

End block ..................................... 51

Clock battery error ....................... 71

ID number output................... 35, 62

Serial interface ............................. 35

SLOW ..................................................... 21

5pd

Display refresh rate................ 34, 37

Stabilization time ........................................ 74, 80

5tart

Title block ..................................... 51

5t-b

Stability band width ................ 34, 37

5-td

Time/Date output ......................... 35

Tare ............................................... 16, 80

Target mass ..................................................... 80

trc

Zero tracking .......................... 34, 37

t-Up

Timeout ........................................ 36

type

Data format ............................ 35, 62

PCS Unit of counting mode.................. 18

Unit ......................................... 10, 11, 43

Unit

Unit ............................................... 36

WinCT Communication Tools .................. 63

Zero point ..................................................... 80

82

MEMO

83

MEMO

84