A&D GH-120, GH-200, GH-300, GH-202 User 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
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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
Shoc
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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
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"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.
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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).
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