Vibra AJ220NT/DBNT User manual

200046M11
High-Precision Tuning Fork
Electronic Balance
AJ-NT/DBNT Series
Operation Manual
SHINKO DENSHI CO., LTD.
• To ensure safe and proper use of the balance, please read
this manual carefully.
• After reading this manual, store it in a safe place near the
balance, so you can review it as needed.
IMPORTANT
This document hosted by: www.oldwillknottscales.com

PREFACE
Thank you for purchasing an AJ Series electronic balance. This is a precision instrument equipped
with exacting mechanisms in a compact body. The AJ series provides enhanced functions, including
a counting mode for stock control of parts, and a limit function for measuring constant quantities by
consecutive weighings. Despite its many functions, the balance is easy to operate and features
user-friendly keys. Furthermore, the large liquid-crystal display provides excellent visibility, and the
instrument’s high speed and stability−intrinsic to a tuning fork design−help boost operational efficiency.
Before using the balance, please check that the following items have been included in the
package.
Should you find any missing parts, please contact our local dealer.
(1) Main unit of balance
(2) Measurement pan
(one round or square pan)
(3) Pan base
(one small for the round-pan
balance; one large for the
square-pan balance)
(4) Windshield
(one for round-pan
balance only)
(5) AC adapter (one)
(6) DIN5P plug set
(7) Operation manual (one)
S
PF
0
ON/OFF

1
CONTENTS
1. Precautions on the Use .................... 2
1.1 Warnings regarding Use................ 2
1.2 For More Precise Measurements .. 5
2. Names of Component Parts ............. 8
2.1 Main Unit ....................................... 8
2.2 LCD Indicators and Operating
Keys .............................................. 9
3. Basic Operations .............................11
3.1 Installation ....................................11
3.2 Operation Check ......................... 13
3.3 Operation for Zero Adjustment .... 14
4. Functions......................................... 16
4.1 Setup and Checking of Functions 16
4.2 Description of Functions.............. 17
4.3 Interface Section ......................... 18
5. Switching Function for
Unit of Measurement.... 19
5.1 Switching Units of Measurement. 19
5.2 Setup of Units of Measurement . 19
6. Counting Pieces.............................. 21
6.1 Sampling ..................................... 21
6.2 Increasing the Counting Accuracy
(Memory Update Method) ........... 23
7. Measuring Percentage
(AJ-NT only).. 24
8. Limit Function ................................. 26
8.1 Limit Function Setup.................... 26
8.2 Setup of Limit Values by Actual
Quantity Loads............................ 28
8.3 Setting up Limit Values by
Inputting Values .......................... 29
9. Input/output functions ........................31
9.1 Terminal Numbers and Functions.......31
9.2 Connection between Balances and
Personal Computers........................32
9.3 Interface Specifications ......................33
9.4 Output Data ........................................34
9.5 Input Commands ................................36
10. Operating the Balance with the
Battery....38
10.1 Specifications ...................................38
10.2 Charging Method..............................38
10.3 User Precautions..............................38
11. Operating the Balance with the
Dry Cell Battery (DBNT) .....................39
12. Troubleshooting ................................40
13. Specifications ....................................41
13.1 Basic Specifications..........................41
13.2 Common Specifications....................42
13.3 Capacities and Minimum Indications
for Different Indication Units ............43
14. Conversion Table of Units ................44

2
1. Precautions on the Use
1.1 Warnings regarding Use
• This Section "Precautions Relating to Use" sets forth precautionary notes that the user should
observe in order to prevent physical injury to the user and/or damage to property.
• The nature of problems that may result in the event of improper operation, and consequential
effects on the quality and performance of the balance, are indicated under the two categories of
"Caution" and "Recommended," and explained using symbols.
注 意
！
CAUTION
This symbol indicates a risk of injury or property damage if the
balance is used improperly. Be sure to observe these notes to
ensure safe use of the balance as the improper use may cause
serious results.
RECOMMENDED This term indicates steps that the user should take to ensure the
quality and reliability of the balance.
Meanings of Symbols Each symbol is accompanied by an instruction.
強制記号
Mandatory
Symbol:
Indicates a “mandatory” action that should be executed
without fail.
水平確認
Check Level
禁止記号
Prohibitive
Symbol:
Indicates a "prohibited" action that must not be
executed.
使用禁止
Do not Use
注 意
！
CAUTION
分解禁止
Do Not
Disassemble
 Do not disassemble or modify the unit.
• Could cause malfunction or heat generation
• Contact our local dealer.
定格外禁止
Do Not
Deviate from
Ratings
 Only AC power (rated value) should be used.
 Only use the dedicated AC adapter.
• Use of other types of power or adapters may
result in heat generation or malfunction of the
balance.
移動禁止
Do Not Move
 Do not move the balance when a sample is
loaded.
• The loaded sample may fall off the
measurement pan and cause an injury.

3
定格外禁止
Do Not Use
 Do not place the balance on an unstable base
or use the balance in a location where it may
be subjected to shock.
• The loaded sample may fall off the
measurement pan.
• Accurate measurement may be rendered
impossible.
定格外禁止
Do Not Drop
 Do not lay the AC adapter cable on the
surface of the passage.
• Somebody may trip on the cable, causing the
balance to fall off, thereby causing injury
and/or damage to the balance.
定格外禁止
Do not Handle
with Wet Hands
 Do not touch the AC adapter or balance with
wet hands.
• Danger of electric shock
定格外禁止
Keep Dry
 Do not use the balance in a location were it
may be subjected to excess moisture.
• Electric shock or short-circuiting could
occur.
• The balance may be corroded, with resultant
malfunction.
定格外禁止
Do Not Leave
Afloat
 Do not use the balance with its adjusters
lifted.
• The balance will become unstable,
preventing accurate measurement.
定格外禁止
Avoid Dust
 Do not use the balance in a location where it
may be subjected to excess dust.
• Risk of explosion or fire
• Short-circuit or lack of continuity may occur,
leading to a malfunction of the balance.
RECOMMENDED
定格外禁止
Do Not Apply
Force
 Avoid applying excess force or impact to the
balance.
Place the sample to be measured on the balance
carefully to prevent breakage or malfunction.
定格外禁止
Do Not Use
 Do not use the balance in a location were it
may be subjected to abrupt changes in
ambient temperature or humidity.
• Accurate measurement may not be
obtained.
• Optimum operations occur when ambient

4
定格外禁止
Do Not
Overload
 Do not use the balance when [o-Err]
(Overloaded) is displayed.
• Take down the loaded sample immediately to
prevent breakage or malfunction.
定格外禁止
Do Not Use
 Do not use the balance in a location where it
is subject to direct sunlight.
• The indications would be illegible.
• An internal temperature increase in the
balance may lead to inaccurate
measurement.
Unplug
Ada
p
te
r
 If the balance is to be unused for an extended
period of time, unplug the adapter.
• This conserves power and prevents
deterioration.
定格外禁止
Do Not Use
 Do not use volatile solvents for cleaning.
• The body may be distorted.
• To clean the unit of stains, use a piece of
dry cloth or cloth soaked in a small quantity
of neutral detergent.
定格外禁止
Do Not Use
 Do not use the balance in a location where it
may be subject to air from an air-conditioning
unit.
• Extreme changes in the ambient temperature
may result in inaccurate measurements.
定格外禁止
Do Not Use
 Do not use the balance on a soft floor.
• When loaded with a sample, the balance may
tip or move, preventing accurate
measurements from being conducted.
Check Level
 Do not use the balance when it is tilted.
 An inclined balance is likely to produce
errors, preventing accurate measurements
from being conducted. Place the balance on
a level surface.

5
1.2 For More Precise Measurements
To be able to conduct more precise measurements, it is necessary to minimize the factors that
contribute to measurement errors. There are a great variety of such error-inducting factors, which can
be linked to machine error and performance of the balance itself, as well as the properties and
condition of samples being measured, and the measuring environment (e.g., vibration,
temperature/humidity). These factors can readily affect the results of measurement on a balance that
has high resolution readability.
This material includes some precautionary notes that the user should bear in mind to eliminate
error factors and ensure accurate measurement results.
1-2-1 Precautions on the Measuring Room
Temperature /
Humidity
→Try to maintain constant room temperature as much as possible to
prevent dew condensation and unstable indications due to
fluctuations in temperature.
→Low relative humidity tends to induce static electricity,causing
measurement error. (Relative humidity of about 60% is considered
ideal.)
Vibration/
Shaking
→The measuring room should preferably be located on the ground
floor or in the basement. Higher floors are more susceptible to
heavy vibration and shaking, which make such locations less
suitable for measurement. A room facing a railway or road with
heavy traffic should also be avoided as much as practicable.
Drafts →Avoid choosing a location subject to a direct draft of airflow from an
air-conditioning unit or exposed to direct sunlight, which may cause
unstable reading due to abrupt fluctuations in temperature.
Also avoid a room subject to a heavy flow of people, since
fluctuations in drafts and temperature are likely to occur in such a
location.
Gravity →The gravity acting on a sample varies depending on the latitude or
height of the location where measurement is being conducted. For
this reason, the same sample may show different weight indications
from one place to another.
Therefore, make it a rule to calibrate the balance every time it is
relocated.
Electromagnetic
Waves
→When the balance is located near an object that generates intense
electromagnetic waves, it may be hindered from showing accurate
weight due to the effects of such waves. Therefore, avoid placing
the balance in such a location.

6
1-2-2 Precautions on the Measuring Bench
Vibration/
Shaking
→If the balance is subjected to vibration during measurement, its indications will
become unstable, thus preventing accurate measurement from being
conducted. To avoid this situation, select a solid measuring bench that is
less susceptible to vibration. (A bench in a vibration-proof structure or one
made of concrete or stonework will be suitable.) Moreover, do not conduct
measurement with a soft cloth or paper placed under the balance, since the
balance may be rocked out of its precise level positioning.
→Place the measuring bench in a location free from vibration as much as
possible. It is a good idea to install the measuring bench in a corner of the
measuring room, where less vibration is likely to occur than in the center of
the room.
Magnetism/
Static
Electricity
→Avoid operating the balance on a bench that is susceptible to the effects of
magnetism or static electricity.
1-2-3 Precautions on the Samples
Static
Electricity
→Generally speaking, objects made of synthetic resin and glass has high
electric insulating properties and, therefore, are apt to be electrically
charged. Measuring a charged sample as is may cause unstable
indications, with resultant poor reproducibility of the results. With this in
mind, be sure to discharge charged samples before measurement.
Magnetism →A sample affected by magnetism indicates different weight values
depending on where it is located on the measuring pan, along with
resultant poor reproducibility of the results.
When a magnetized sample must be measured, first demagnetize it or
place an appropriate pedestal on the measuring pan to adequately
separate the mechanism part of the balance from the magnetized sample
for avoiding the effects of magnetism.
Absorption/
Evaporation
of Moisture
→Measuring a sample with moisture absorbed or evaporated (volatized)
continuously increases or decreases the values indicated. In such case,
measure the sample in a container with a small opening and sealed
airtight with a cap.
Sample
Temperature
→A difference in temperature between a sample and the interior of a
windshield may cause convection to occur inside the windshield, resulting
in erroneous measurement. Therefore, measure a very hot or cold
sample only after allowing time for its temperature to acclimatize to room
temperature. Moreover, to prevent convection inside the windshield,
allow time for the interior of the windshield to acclimatize to room
temperature.
→The body heat of a person conducting measurement can also affect
measurement results. Avoid holding the sample with bare hands, and
use long tweezers or a similar tool instead. Also refrain from putting your
hands inside the windshield while measurement is in progress.

7
1-2-4 Precautions on the Main Unit of the Balance
Precautions
on Use
→A transparent dust cover, supplied for some models, may be statically
charged under low humidity conditions, which may cause unstable
readinig. In such case, wipe the dust cover with a damp cloth or use a
commercial antistatic agent. Otherwise, simply operate the balance with
the dust cover removed.
→ For more stable measurement, it is recommended to have 30 minutes
warm up time after power-up, and apply a load equivalent to the weighing
capacity several times before conducting actual measurement operation.
Calibration →
Periodically calibrate the balance with an internal or external calibration
weight to ensure accurate measurement at all times.
→
For more precise calibration, use an external calibration weight that
approximates the weighing capacity. Moreover, calibrate the balance
only after enough warm up time and loading near capacity weight.
→Calibration is also required in the following cases:
When operating the balance for the first time,
When not using the balance for a long time,
When relocating the balance, or
When there is wide fluctuation in temperature, humidity or atmospheric
pressure.
Maintenance →
When the measuring pan or pan base is contaminated with powder or
liquid, erroneous weight values may result or indications may remain
unstable. Therefore, be sure to frequently clean the balance. When
cleaning the balance, be very careful not to allow dirt or liquid to penetrate
inside (the mechanism part).

8
2. Names of Component Parts
2.1 Main Unit
Capacity(g) Pan type
220～620 Round
820～12K Square
Operation keys
See page 10.
Level
For checking
the level of the
balance
Turn the adjusters
until the bubble rests
in the center of the
red circle.
A
djusters
Round-pan type: Total of two, one on either
side of the unit’s front
Square-pan type: Total of four, one on either
side at front and rear
AC adapter
connector
Measurement
pan
Liquid-crystal
display (LCD)
See page 9.
RS232C
connector
Windshield
Supplied only with
the round-pan types
The top lid is
detachable.
Front View (round-pan type)
Rear view
Square-pan type
Dry Cell Box
(DBNT)
S
PF0
ON/OFF
S
PF
0
ON/OFF

9
2.2 LCD Indicators and Operating Keys
2.2.1 Symbols Displayed
Display Description
gGrams
→0←Zero point
○Indication of stable balance (If the light is off, the balance is unstable.)
＊Balance powered up (Lights up when the power is turned off) or data transmitted
Pcs Counting mode
% percentages mode
Indication of judgement result (HI/OK/LO) when the limit function is active.
M Display of set values from memory (If a value is flashing, it is being saved.)
CAL Stays on and flashes while span adjustment is in progress.
Auxiliary scale interval (Lights up only when the auxiliary scale interval is
displayed.)
Bar graph
[ ] (ct) carat
[ ] (oz) ounce
[ ] (lb) pound
[ ](ozt)troyounce
[ ] (dwt) pennyweight
[ (Upper right) ] grain
It stays on [ ] when operated by rechargeable battery or dry cell battery.
It flashes [ ] when the battery capacity becomes low.
( Refer to page 38 or 39.)
It does not show when powered by AC adaptor.
0 F
0
0F
Pcs
#
g
ＨＩ
ＯＫ
ＬＯ
%

10
2.2.2 Names and Functions of Operating Keys
Operating Key Function
ON/OFF
On/off key Key to turn on/off the unit power
P
Memory key
[Brief press] initiates print or output.
[Brief press] saves the settings of the number of pieces,
or the limit value when using the limit
function.
S
Set key
[Brief press] starts setting the number of pieces or
percentages (%).
[Continuous press] starts setting the limit value when using the
limit function.
F
Function key
[Brief press] toggle-switches the units to be displayed in
succession (g, Pcs, etc.).
[Brief press] moves the flashing digit in the setup of a
limit value when using the value input
method.
[Brief press] selects an item when setting the function.
[Continuous press] invokes various functions.
[Longer continuous press] invokes span adjustment.
0
Zero key
[Brief press] resets the indication to zero when using
zero-point setup.
[Brief press] selects a value with the value input method
when using the limit function.
[Brief press] selects a function when operating the
balance in the function mode.

11
step
step
3. Basic Operations
3.1 Installation
1 Positioning the measurement pan
First, mount the pan base on the
main unit of the balance and place
the measurement pan on top of it.
Be sure to mount the pan base in
the correct direction, as illustrated
below.
2 Windshield setting(Capacity 220g～620g only)
(1)Set a small panel in a large panel.
An edge with step should face the
same side.
(2)Set the other large panel in the
assembly above.
(3)Set the other small panel in the
assembly above.
(1)
(2)
(3)
S
PF
0
ON/OFF

12
3 Put on the windshield
Put the cover on top and place the
complete assembly along the guide.
4 Securing the exact level of the balance
Position of air bubble
in the level
Turn the adjusters until the bubble
rests in the center of the red circle
on the level.
Round-pan type: total of two
adjusters, one on
either side at front
Square-pan type: total of four
adjusters, one on
either side at front
and rear
<Caution>
Use caution when operating the
adjusters on the square-pan type to
prevent them from lifting up.
5 Connecting the AC adapter
Connect the AC adapter to the
balance, as illustrated at left.
※Take 5 minutes before operation.
<Caution>
If the balance has the battery
installed, refer to “10. Operating the
Balance with the Battery.
S
PF0
ON/O FF
S
PF0
ON/O FF

13
3.2 Operation Check
1 Turning on the power
*
When the balance has the AC
adapter connected, it displays [＊].
Pressing the On/Off key
The display section lights up, and
the balance is ready for operation.
2 Checking the display
Check to see if the display has any
missing indications or unlit parts.
A few seconds after startup, the
indication is reset to zero.
3 Switching the measurement mode
Press the Function key.
Each time the key is pressed, the
unit of measurement changes, as
indicated.
※The balance is shipped from the
factory with the following switching
sequence: [g] →[ct] →[Pcs] →[g]
→· · ·
4 Verifying changes in the read-out indicator
Press the measurement pan lightly
and make sure that the read-out
indicator changes.
Also, ensure that the read-out
indicator is reset to zero when you
release your hand.
0
0F
Pcs
#
g
%

14
3.3 Operation for Zero Adjustment
1 Place the container on the balance.
As you place the container, the
balance indicates its weight.
2 Reset read-out indication to zero.
Press the Zero key.
The container is subtracted and the
balance indicates zero.
3 Load the sample to be weighed.
The balance will now indicate only
the weight of the sample loaded in
the container.
☆Weighing only the weight of an added sample
4 Resetting the indication to zero
Press the Zero key.
The total weight of the sample
loaded on the measurement pan is
indicated as zero.
5 Adding samples to be measured
The balance indicates only the
weight of an added sample.
When the weight (of a sample)
currently loaded on the
measurement pan is reset to zero
with the Zero key, as mentioned
above, only the weight of the sample
will be measured.

15
☆Key Points of the Procedure ☆
The following applies equally to all the measurement modes for weight measurement, counting, and
percentages.
1. After the balance is switched off, there is still enough current to display [＊]. This indicates that
the AC adapter is connected to an electrical outlet, but that the balance is turned off.
When the balance is switched on again, [＊] will disappear.
※If the balance is running on batteries and the unit is switched off, the display does not display
[＊].
2. The bar graph shows the current load status with respect to the
capacity of the balance. The nearer the [F] mark draws, the smaller
the measurable weight becomes.
※Even when the display currently indicates zero with the weight
subtracted, the weight corresponding to the gross value is indicated
on the bar.
3. When the balance remains stable, the stability indicator [○] remains
on. If the balance becomes unstable, the stability indicator [○] will disappear.
When a displayed value flickers or the stability mark flashes on and off, it is likely that the
balance is being affected by wind or other vibrations. Use the windshield or vibration dampers
to protect against such adverse effects.
4. When the read-out indicator is reset to zero, the balance indicates zero this way: [→0 ←].
5. Only weight fraction that was canceled, the measurable range is reduced.
Measurable Range = Capacity – container weight.
6. If [o-Err] appears when a sample is loaded, the measurable range has been exceeded.
7. In counting mode, if no sample is stored in memory the indicator will not change, even when the
measurement pan is pressed.
8. The measurement mode that is activated when the balance is switched on will be the one that
was active when last switched off. For example, if the balance was switched off in counting
mode, this counting mode will be reactivated the next time the balance is switched on.
0F
ゼロ点
ひょう量の1
/
ひょ
う
Zero-
point
Capacity
point
Half (1/2) capacity

16
4. Functions
4.1 Setup and Checking of Functions
1 Invoking the function Press and hold down the
Function key until the indicator
changes to “Func,” then release
the key.
The function setup mode is
activated, and the first item,
[1. b.G. 1 (Bar graph) 1] appears.
(See “4.2 Description of Functions”
on page 17.)
2 Selecting the next item
Press the Function key.
The indication changes to the next
item, [2.SEL 0 (Limit function)].
3 Selecting an item
Pressing the Function key
advances the function items at the
rate of one item per press.
4 Changing the content of an item
Select the item to be changed with
the Function key.
Each press of the Zero key
changes the digit on the right end.
Select the desired one.
5 Terminating the function selection
Press the Set key.
The balance terminates the function
setup and returns to measurement
mode.

17
4.2 Description of Functions
Item Set Value Description
0 Disable
Bar graph display 1. b.G. ☆1 Enable
☆0 Disable
Limit function 2.SEL 1 Enable
☆1 Always judge (judges even when the balance is
unstable)
Judgement
condition 21.Co.
2 Judge only when the balance is stable (does not
judge if the balance is unstable)
0
Ranges beyond +5 graduation is judged (ranges +5
graduation or below, including negative ranges, are
not judged.)
Judgement
range 22.Li
☆1 The entire range is judged (the entire range,
including the negative, is judged).
1 One-point setup (judges between OK and LO)
Displayed only when limit
function is activated
Number of
points for
judgement
23.Pi ☆2 Upper-limit and lower-limit values are set up (judges
among HI, OK and LO).
0 Disable (balance operates
continuously)
Auto power-off 4. A.P.
☆1
Enable (balance powers off
in approximately three
minutes)
This function is
available only when
the balance is
battery-operated.
0 Measurement by consecutive weighings.
1
2
☆3
4
Response speed 5. rE.
5
Fast
↓
Slow
☆6 0 Disable input/output
☆1 Six-digit numeric format
Interface 7. I.F.
2 Seven-digit numeric format
☆1 01 [ g]
☆2 14 [ ] (ct)
15 [ ] (oz)
16 [ ] (lb)
17 [ ](ozt)
18 [ ](dwt)
19Ú1[ Lower right ] (grain)
☆3 20 [Pcs]
1F [ % ]
Setup of units of
measurement to be
displayed
Register selected
measuring units with
Function key.
81.S.u.
|
85.S.u.
☆4,5 00 Unit not set
Items mrked ☆are the default factory settings.
☆1～☆5: default factory settings [81.S.u.]～[85.S.u.]
☆6: AJ-NTDB Type only
※ 1 For 220g～6200g Capacity model