AWS AT Series User manual

AT-100 (100g x 0.01g)
AT-500 (500g x 0.1g)
User Manual
AT-Series
Copyright © 2010 American Weigh Scales, Inc.
All rights reserved. Rev. 3.0

AT-Series
Thank you for purchasing the American Weigh
AT-Series digital pocket scale. Please read all operating
instructions carefully before use. Scales are precision
measuring devices and should always be handled with
proper care. To ensure years of reliable service, keep these
simple tips in mind:
• Do not exceed the scale’s maximum capacity.
Overloading your scale can permanently damage it!
• Avoid exposure to extreme heat or cold. Scales
perform best at normal room temperature. If
temperatures have changed dramatically, calibration
and adjustment may be necessary.
• Allow your scale to warm up for 30-60 seconds before
performing calibration and adjustment(if available).
• Store your scale in a clean, dry location. Dust, dirt,
and moisture can accumulate on the weighing
sensors and electronics causing inaccuracy or
malfunction.
• Avoid using your scale in close proximity to strong
radio wave emitting devices such as computers, cash
registers, and cordless phones.
• Alwaysweighonaatandlevelsurface,freefrom
vibrations and drafts. The corner of a room is usually
the most stable.
• Gently apply all items to be weighed. Do not drop
items onto the weighing platform.
• Avoid dropping your scale. The warranty does not
cover damage due to rough treatment or overload.
• Checkthebatteriesrstifyouarehavinganytrouble
with your scale. This simple step can remedy most
scale issues.
• Do not disassemble your scale. This product contains
no user serviceable parts.

I. Part List
1. Scale
2. Cover
3. Weighing Tray
4. AAA Batteries (x2)
II. Key Description
III. Battery Installation
1. Beforeusingthescaleforthersttime,check
the battery compartment and remove any plastic
insulation strips or packaging that may be in place to
prevent battery drainage during shipping/storage.
2. If you are replacing the batteries, make sure the
positive and negative contacts are properly aligned.
Mode Key
Tare Key
Weight Indicator
Cal Key
ON/OFF Key
C
A
L
T
A
R
E
M
O
D
E
O
N
/
O
F
F
MAX: 100g d=0.01g
g

AT-Series
IV. Operation
1. Placethescaleonaat,levelsurfaceandpressthe
ON/OFF key to turn the scale on.
2. Once the start-up process completes and the scale
goes to zero you are ready to weigh.
3. Place the quantity to be weighed onto the weighing
platform.
4. Wait a couple seconds for the display to stabilize
before taking a weight reading.
V. Changing the Unit of Measure
1. Press the MODE key to change the scales displayed
unit of measure.
2. If the scale is turned off then back on, it will default
to the last unit used.
• AT-100 Units: g (gram) oz (ounce) ct (carat)
gn (grain)
• AT-500 Units: g (gram) oz (ounce) ozt (troy
ounce) dwt (pennyweight)
VI. Using the Tare Feature
You can use this scale’s tare feature to subtract the weight
of an empty container or vessel for net weight determination.
NOTE: The weight of the container will subtract from the
available capacity.
1. Place the empty container or vessel on the weighing
platform.
2. Press the TARE key once. The display will then
reset to zero. If the container is removed, it’s weight
will be displayed as a negative number.
3. Youmaynowllthecontainerwiththequantityto
be weighed. The display will show the net weight of

the contents.
4. To return to normal weight display (gross weight),
remove any items from the weighing platform and
press the TARE key again to re-zero the scale.
VII. Calibration
Calibration and adjustment are performed at the factory.
However, the weighing range can shift slightly during
shipping. Also, due to changes in local acceleration of gravity
around the world, adjustment is recommended when moving
the scale from one location to another. To check calibration:
1. Place the required calibration weight on the scale
and note the displayed value.
2. If the displayed value is not within acceptable
tolerance (see chart below), adjustment is required.
Model Acceptable
Tolerance (±)
Calibration
Weight
Recommended
Accuracy Class
AT-100 0.02g 100g OIML M2
AT-500 0.2g 500g OIML M2
VIII. Adjustment
1. Press and hold the CAL key until the display shows
“CAL”.
2. Press the CALkeyagain.Thedisplaywillash
“CAL” followed by the calibration weight value (see
chart).
3. Place the calibration weight on the center of the
weighing platform. Make sure you are using the
correctweightforyourspecicmodel.
4. Once the weight is accepted, the display will show
“PASS” then return to normal operation.

AT-Series
IX. Troubleshooting
• Problem: Scale will not turn on
• Solution: Check the batteries
• Problem: Displayedweightuctuatesrandomly
• Solution: Make sure your workspace is stable and
free of any air currents or vibration
• Problem: Displayed weight is inaccurate
• Solution: Perform a calibration adjustment
X. Error Codes
1. OUTZ - Zero range has shifted. Perform calibration
adjustment. If the problem persists, the load cell may
be permanently damaged due to overloading.
2. 88888 - Maximum capacity exceeded. Remove the
extra weight to avoid damaging the load cell.
3. L - Batteries are low. Replace the batteries.

XI. Specications
AT-100 AT-500
Max. Capacity 100g 500g
Readability 0.01g 0.1g
Min. Capacity 0.03g 0.2g
Power 2 x AAA Alkaline Batteries
Dimensions 3.8 x 3.8 x 1.3”
Platform Dimensions 2.0 x 3.0”
XII. Capacity/Readability Charts
AT-100 AT-500
100g x 0.01g
3.537oz x 0.001oz
500ct x 0.05ct
1543gn x 0.1gn
500g x 0.1g
17.64oz x 0.001oz
16.08ozt x 0.001ozt
321.5dwt x 0.1dwt