A&D Scale HT120 User Manual

							 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1WMPD4002673 
						

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SAFETY PRECAUTIONS 
All safety messages are identified by the following, WA R N I N G or 
 CAUTION , of ANSI Z535.4  (American National Standard Institute: Product 
Safety Signs and Labels). The meanings are as follows: 
 
 
 
 
  
						

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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 pursu ant to Subpart J 
of Part 15 of FCC rules. These rul es are designed to provide reasonable 
protection against interference when  the equipment is operated in a 
commercial environment. If this unit is  operated in a residential area it may 
cause some interference and under thes e 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.)  
 
 
 
UNPACKING 
Check whether all of the following items are included: 
 
 
 
 
 
                                        
4x“AA” batteries 
                                       
(inside the main unit) 
Carrying case         Main unit                   Instruction Manual 
 
The bubble should be in the center of the circle. 
PARTS DESCRIPTION 
 
  
 
 
 
 
  
 
 
 
 
 
  
  
  
 
 
Battery cover 
(on the bottom) 
Weighing pan 
(stainless steel)Sprit level 
ON:OFF key
UNITS key 
RE-ZERO key
Calibration 
switch cover 
Leveling foot 
Display 
Pan support
OK NG 
(Adjust the leveling feet as the bubble is in the middle of the circle.)
Weighing pan 
						

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  ON:OFF  key 
Turns the scale power on/off. 
 RE-ZERO  key Sets the display to zero. When  the weight is within ±2% 
of the weighing capacity to  the zero point at the 
power-on, the key will zero  the scale. When the weight 
exceeds +2%, it will be subtracted as tare weight. 
 MODE  key Changes the weighing units. 
STABLE indicator  Turns on when the weight reading is stable. 
NET indicator Turns on when the net weight is displayed. 
ZERO indicator  Turns on at the center of ze
ro point. At the net weight 
zero point, both the ZERO and NET turn on. 
Battery indicator  Shows the remaining battery level in 4 steps when 
operated by batteries. 
 
 
 
PREPARATION 
Installing Batteries 
Step 1  Remove the battery cover. 
 
Step 2 Before use, remove the 
insulation tape from the 
battery compartment. 
 
Step 3  Insert 4 new batteries into the  battery compartment, taking 
care of the polarities. 
 
Step 4  Replace the battery cover. 
STABLE indicator 
NET indicator 
ZERO indicator Weighing units 
Battery indicator 
Battery cover
4 new batteries
Insulation tape 
Step 1
Step 2
Security slot 
(Use a security cable
commercially available.) 
AC adapter jack 
(Use a correct AC adapter
for your local voltage and
receptacle type.)  
						

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Note  The batteries provided with the scale are for testing the performance 
of the scale and may have a limited life. 
 
 
When Using the AC adapter 
Step 1  Verify that the AC adapter is correct. 
 
Step 2  Plug the AC adapter into the  AC adapter jack. 
 
 
Possibility of Electrostatic Influence 
When the ambient humidity gets low, 
plastics and insulators  will be easily charged. 
That may make the reading unstable and 
cause some errors. To reduce the 
electrostatic influence, ground the scale 
using a threaded screw hole on the bottom. 
A ground wire and a screw are not included. 
Prepare the screw M3 x @ ~ M3 x # (mm).  
 
 
 
 
WEIGHING 
Step 1  Press the    ON:OFF    key to t urn the scale on. The scale displays all 
segments for a few seconds and shows zero. 
Press the    ON:OFF    key again to turn the scale off. 
 
Step 2  Press the    UNITS    key to select an appropriate weighing unit. 
The scale will power up with the same weighing unit as the one in use 
when turned off last time. 
 
Step 3  Verify that the reading is zero.  If not, press the   RE-ZERO  key to 
zero the display. When you use a  container for weighing, place an 
empty container on the weighing  pan and press the    RE-ZERO    key 
to zero the display. 
 
Step 4  Place objects to be weighed on the weighing pan or in the container.  Wait for the STABLE  { to be displayed and read the value. 
 
 
 
AC adapter jack 
AC adapter
Screw hole  
						

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Errors 
 eeeeee      Overload. Remove object from the weighing pan. 
 ------      Out of range or unstable error. Th ere is a load beyond the zero 
range at the power-on. When pressed the  RE-ZERO  key or 
powered on, unstable weighing shows this display either. 
  lbeeee      Low battery. Replace batteries with four new ones immediately. 
 Caleee      Calibration error. Unstable weighing or incorrect calibration weight. 
 erree#      Internal errors (# will be 1, 2, 3, 4, 5 or 6). Request service. 
 
 
 
FUNCTIONS 
Entering the Function Settings 
Turn the scale turned off and press  the  ON:OFF  key while 
pressing the  RE-ZERO  key. Then, the display will show the 
software version   p-1.00  (“1.00” is an example and may be a 
different number.) This is the starting point of the function settings. 
 
Key Operation 
  UNITS    key  To select a function item. 
  RE-ZERO    key  To change the parameter of each item. 
  ON:OFF    key  To finish the operation and turns off the scale. 
 
Starting at the software version display, each function item appears 
cyclically by pressing the    UNITS    key. 
 

						

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Automatic Power Off Function   
If the scale is left ON and the STABLE { is displayed, the automatic 
power-off function turns power off after approximately 5 minutes. 
  poff 0      Automatic power off function is disabled. 
 poff 1      Automatic power off function is enabled. (factory default) 
 
Setting the Response/Stability Condition 
This function is to specify the  response speed and to stabilize the 
weight value reducing the influence of ambient environment like 
vibration. But note that the setting is a trade-off between response 
and stability. 
  Cond 0      Fast response / Sensitive to the vibration 
 Cond 1      Normal condition for both response and stability (factory 
default) 
  Cond 2      Slow response / Insensitive to the vibration   
 
Setting the Zero Tracking Function 
This function is to automatically track small zero drift caused by 
changes in the ambient environment. 
  trc  0      Zero tracking function is disabled. 
 trc  1      Zero tracking function is enabled. (factory default) 
 
Selecting the Decimal Point 
This function is to select the decimal separator.  
  pnt  0      “.” (period) (factory default) 
 pnt  1   “,” (comma) 
 
Setting the LCD Backlight Operation 
This function is to control how t he LCD backlight turns off. When the 
weight data becomes and stays  stable for some seconds, the 
backlight will automatically turn of f. The weight change or the key 
operation will turn the backlight on  (except the settings “always on ” 
and “always off”). 
  ltUp 0      Backlight is always off. 
 ltUp 1      Backlight turns off 5 seconds after STABLE turning on. 
 ltUp 2      Backlight turns off 10 seconds after STABLE turning on. 
 ltUp 3      Backlight turns off 30 sec onds after STABLE turning on. 
(factory default) 
  ltUp 4      Backlight turns off 60 seconds after STABLE turning on. 
 ltUp 5      Backlight is always on.  
						

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Setting the Weighing Units to Use 

						

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CALIBRATION 
When is Calibration Required?   
Calibration may be required when 
the scale was initially installed or 
has been moved to another 
location. 
   
 
Calibration Using a Calibration Weight   
Step 1  Press the Calibration switch while the scale is in the weighing mode. 
Then,   Cal       will be displayed. 
 
Step 2  Press the    RE-ZERO    key and    Cal  0
g    will be displayed. 
With nothing on the weighing pan, press the    RE-ZERO    key. 
 
Step 3  The display shows    Cal       blinking while wa iting for the weighing 
value to be stable. When becoming  stable, the scale perform zero 
calibration and will show    Cal100
g    (factory default) with tens place 
digit blinking). 
Select the next step as follows:   

						

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gravity acceleration of your scale to the value of the area where the 
scale is used. See “The Value of  Gravity Acceleration at Various 
Locations” of this manual. 
 
Step 1  Start  from    Cal     display at the Step 1 of “Calibration Using a 
Calibration Weight”, and press the  UNITS  key and the current 
acceleration value will be displayed.      ex.    9.7985  
 
Step 2  Press the    RE-ZERO    and the di git that can be changed starts to 
blink. Change the value with following keys. 
  RE-ZERO    key  To increment the blinking digit. 
  UNITS    key  To move the blinking digit. 
 
Step 3 After setting the new value, press the  RE-ZERO  key while 
pressing the  UNITS  key. T hen, the display will show   end     for 
a second and stop blinking the valu e. Press the  ON:OFF  key to 
finish the procedure. 
 
 
Restoring the Calibration Data 
The zero calibration, span calibrati on and gravity acceleration values 
can be restored to the factory default values. 
Ex. The scale was calibrated with wrong weight, but there is no 
correct weight. The values above can be reset to the factory default. 
 
Step 1  Start  from    Cal     display at the Step 1 of “Calibration Using a 
Calibration Weight”, and press the    UNITS    key twice to display   
 Clr    . 
 
Step 2  Press the    RE-ZERO    key, then the display will show    Clr no . 
Press the    RE-ZERO    key again to display   Clr go  to restore. 
 
Step 3  At the display    Clr go , press the    RE-ZERO    key while pressing 
the  UNITS  key. Then, the display will show   end     for a 
second and automatically return to   Clr    . 
Press the    ON:OFF    key to finish the procedure.